drivers/net/ethernet/cisco/enic/enic_main.c

   1 /*
   2  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/pci.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if.h>
  32 #include <linux/if_ether.h>
  33 #include <linux/if_vlan.h>
  34 #include <linux/in.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include <linux/tcp.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/prefetch.h>
  40 #include <net/ip6_checksum.h>
  41 #include <linux/ktime.h>
  42 #ifdef CONFIG_RFS_ACCEL
  43 #include <linux/cpu_rmap.h>
  44 #endif
  45 #ifdef CONFIG_NET_RX_BUSY_POLL
  46 #include <net/busy_poll.h>
  47 #endif
  48 #include <linux/crash_dump.h>
  49
  50 #include "cq_enet_desc.h"
  51 #include "vnic_dev.h"
  52 #include "vnic_intr.h"
  53 #include "vnic_stats.h"
  54 #include "vnic_vic.h"
  55 #include "enic_res.h"
  56 #include "enic.h"
  57 #include "enic_dev.h"
  58 #include "enic_pp.h"
  59 #include "enic_clsf.h"
  60
  61 #define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
  62 #define WQ_ENET_MAX_DESC_LEN            (1 << WQ_ENET_LEN_BITS)
  63 #define MAX_TSO                         (1 << 16)
  64 #define ENIC_DESC_MAX_SPLITS            (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
  65
  66 #define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
  67 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
  68 #define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */
  69
  70 #define RX_COPYBREAK_DEFAULT            256
  71
  72 /* Supported devices */
  73 static const struct pci_device_id enic_id_table[] = {
  74         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
  75         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
  76         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
  77         { 0, }  /* end of table */
  78 };
  79
  80 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  81 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  82 MODULE_LICENSE("GPL");
  83 MODULE_VERSION(DRV_VERSION);
  84 MODULE_DEVICE_TABLE(pci, enic_id_table);
  85
  86 #define ENIC_LARGE_PKT_THRESHOLD                1000
  87 #define ENIC_MAX_COALESCE_TIMERS                10
  88 /*  Interrupt moderation table, which will be used to decide the
  89  *  coalescing timer values
  90  *  {rx_rate in Mbps, mapping percentage of the range}
  91  */
  92 static struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
  93         {4000,  0},
  94         {4400, 10},
  95         {5060, 20},
  96         {5230, 30},
  97         {5540, 40},
  98         {5820, 50},
  99         {6120, 60},
 100         {6435, 70},
 101         {6745, 80},
 102         {7000, 90},
 103         {0xFFFFFFFF, 100}
 104 };
 105
 106 /* This table helps the driver to pick different ranges for rx coalescing
 107  * timer depending on the link speed.
 108  */
 109 static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
 110         {0,  0}, /* 0  - 4  Gbps */
 111         {0,  3}, /* 4  - 10 Gbps */
 112         {3,  6}, /* 10 - 40 Gbps */
 113 };
 114
 115 int enic_is_dynamic(struct enic *enic)
 116 {
 117         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
 118 }
 119
 120 int enic_sriov_enabled(struct enic *enic)
 121 {
 122         return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
 123 }
 124
 125 static int enic_is_sriov_vf(struct enic *enic)
 126 {
 127         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
 128 }
 129
 130 int enic_is_valid_vf(struct enic *enic, int vf)
 131 {
 132 #ifdef CONFIG_PCI_IOV
 133         return vf >= 0 && vf < enic->num_vfs;
 134 #else
 135         return 0;
 136 #endif
 137 }
 138
 139 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 140 {
 141         struct enic *enic = vnic_dev_priv(wq->vdev);
 142
 143         if (buf->sop)
 144                 pci_unmap_single(enic->pdev, buf->dma_addr,
 145                         buf->len, PCI_DMA_TODEVICE);
 146         else
 147                 pci_unmap_page(enic->pdev, buf->dma_addr,
 148                         buf->len, PCI_DMA_TODEVICE);
 149
 150         if (buf->os_buf)
 151                 dev_kfree_skb_any(buf->os_buf);
 152 }
 153
 154 static void enic_wq_free_buf(struct vnic_wq *wq,
 155         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 156 {
 157         enic_free_wq_buf(wq, buf);
 158 }
 159
 160 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 161         u8 type, u16 q_number, u16 completed_index, void *opaque)
 162 {
 163         struct enic *enic = vnic_dev_priv(vdev);
 164
 165         spin_lock(&enic->wq_lock[q_number]);
 166
 167         vnic_wq_service(&enic->wq[q_number], cq_desc,
 168                 completed_index, enic_wq_free_buf,
 169                 opaque);
 170
 171         if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
 172             vnic_wq_desc_avail(&enic->wq[q_number]) >=
 173             (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 174                 netif_wake_subqueue(enic->netdev, q_number);
 175
 176         spin_unlock(&enic->wq_lock[q_number]);
 177
 178         return 0;
 179 }
 180
 181 static bool enic_log_q_error(struct enic *enic)
 182 {
 183         unsigned int i;
 184         u32 error_status;
 185         bool err = false;
 186
 187         for (i = 0; i < enic->wq_count; i++) {
 188                 error_status = vnic_wq_error_status(&enic->wq[i]);
 189                 err |= error_status;
 190                 if (error_status)
 191                         netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
 192                                 i, error_status);
 193         }
 194
 195         for (i = 0; i < enic->rq_count; i++) {
 196                 error_status = vnic_rq_error_status(&enic->rq[i]);
 197                 err |= error_status;
 198                 if (error_status)
 199                         netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
 200                                 i, error_status);
 201         }
 202
 203         return err;
 204 }
 205
 206 static void enic_msglvl_check(struct enic *enic)
 207 {
 208         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 209
 210         if (msg_enable != enic->msg_enable) {
 211                 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
 212                         enic->msg_enable, msg_enable);
 213                 enic->msg_enable = msg_enable;
 214         }
 215 }
 216
 217 static void enic_mtu_check(struct enic *enic)
 218 {
 219         u32 mtu = vnic_dev_mtu(enic->vdev);
 220         struct net_device *netdev = enic->netdev;
 221
 222         if (mtu && mtu != enic->port_mtu) {
 223                 enic->port_mtu = mtu;
 224                 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 225                         mtu = max_t(int, ENIC_MIN_MTU,
 226                                 min_t(int, ENIC_MAX_MTU, mtu));
 227                         if (mtu != netdev->mtu)
 228                                 schedule_work(&enic->change_mtu_work);
 229                 } else {
 230                         if (mtu < netdev->mtu)
 231                                 netdev_warn(netdev,
 232                                         "interface MTU (%d) set higher "
 233                                         "than switch port MTU (%d)\n",
 234                                         netdev->mtu, mtu);
 235                 }
 236         }
 237 }
 238
 239 static void enic_link_check(struct enic *enic)
 240 {
 241         int link_status = vnic_dev_link_status(enic->vdev);
 242         int carrier_ok = netif_carrier_ok(enic->netdev);
 243
 244         if (link_status && !carrier_ok) {
 245                 netdev_info(enic->netdev, "Link UP\n");
 246                 netif_carrier_on(enic->netdev);
 247         } else if (!link_status && carrier_ok) {
 248                 netdev_info(enic->netdev, "Link DOWN\n");
 249                 netif_carrier_off(enic->netdev);
 250         }
 251 }
 252
 253 static void enic_notify_check(struct enic *enic)
 254 {
 255         enic_msglvl_check(enic);
 256         enic_mtu_check(enic);
 257         enic_link_check(enic);
 258 }
 259
 260 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 261
 262 static irqreturn_t enic_isr_legacy(int irq, void *data)
 263 {
 264         struct net_device *netdev = data;
 265         struct enic *enic = netdev_priv(netdev);
 266         unsigned int io_intr = enic_legacy_io_intr();
 267         unsigned int err_intr = enic_legacy_err_intr();
 268         unsigned int notify_intr = enic_legacy_notify_intr();
 269         u32 pba;
 270
 271         vnic_intr_mask(&enic->intr[io_intr]);
 272
 273         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 274         if (!pba) {
 275                 vnic_intr_unmask(&enic->intr[io_intr]);
 276                 return IRQ_NONE;        /* not our interrupt */
 277         }
 278
 279         if (ENIC_TEST_INTR(pba, notify_intr)) {
 280                 enic_notify_check(enic);
 281                 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
 282         }
 283
 284         if (ENIC_TEST_INTR(pba, err_intr)) {
 285                 vnic_intr_return_all_credits(&enic->intr[err_intr]);
 286                 enic_log_q_error(enic);
 287                 /* schedule recovery from WQ/RQ error */
 288                 schedule_work(&enic->reset);
 289                 return IRQ_HANDLED;
 290         }
 291
 292         if (ENIC_TEST_INTR(pba, io_intr))
 293                 napi_schedule_irqoff(&enic->napi[0]);
 294         else
 295                 vnic_intr_unmask(&enic->intr[io_intr]);
 296
 297         return IRQ_HANDLED;
 298 }
 299
 300 static irqreturn_t enic_isr_msi(int irq, void *data)
 301 {
 302         struct enic *enic = data;
 303
 304         /* With MSI, there is no sharing of interrupts, so this is
 305          * our interrupt and there is no need to ack it.  The device
 306          * is not providing per-vector masking, so the OS will not
 307          * write to PCI config space to mask/unmask the interrupt.
 308          * We're using mask_on_assertion for MSI, so the device
 309          * automatically masks the interrupt when the interrupt is
 310          * generated.  Later, when exiting polling, the interrupt
 311          * will be unmasked (see enic_poll).
 312          *
 313          * Also, the device uses the same PCIe Traffic Class (TC)
 314          * for Memory Write data and MSI, so there are no ordering
 315          * issues; the MSI will always arrive at the Root Complex
 316          * _after_ corresponding Memory Writes (i.e. descriptor
 317          * writes).
 318          */
 319
 320         napi_schedule_irqoff(&enic->napi[0]);
 321
 322         return IRQ_HANDLED;
 323 }
 324
 325 static irqreturn_t enic_isr_msix(int irq, void *data)
 326 {
 327         struct napi_struct *napi = data;
 328
 329         napi_schedule_irqoff(napi);
 330
 331         return IRQ_HANDLED;
 332 }
 333
 334 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 335 {
 336         struct enic *enic = data;
 337         unsigned int intr = enic_msix_err_intr(enic);
 338
 339         vnic_intr_return_all_credits(&enic->intr[intr]);
 340
 341         if (enic_log_q_error(enic))
 342                 /* schedule recovery from WQ/RQ error */
 343                 schedule_work(&enic->reset);
 344
 345         return IRQ_HANDLED;
 346 }
 347
 348 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 349 {
 350         struct enic *enic = data;
 351         unsigned int intr = enic_msix_notify_intr(enic);
 352
 353         enic_notify_check(enic);
 354         vnic_intr_return_all_credits(&enic->intr[intr]);
 355
 356         return IRQ_HANDLED;
 357 }
 358
 359 static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq,
 360                                   struct sk_buff *skb, unsigned int len_left,
 361                                   int loopback)
 362 {
 363         const skb_frag_t *frag;
 364         dma_addr_t dma_addr;
 365
 366         /* Queue additional data fragments */
 367         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 368                 len_left -= skb_frag_size(frag);
 369                 dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0,
 370                                             skb_frag_size(frag),
 371                                             DMA_TO_DEVICE);
 372                 if (unlikely(enic_dma_map_check(enic, dma_addr)))
 373                         return -ENOMEM;
 374                 enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag),
 375                                         (len_left == 0),        /* EOP? */
 376                                         loopback);
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq,
 383                                   struct sk_buff *skb, int vlan_tag_insert,
 384                                   unsigned int vlan_tag, int loopback)
 385 {
 386         unsigned int head_len = skb_headlen(skb);
 387         unsigned int len_left = skb->len - head_len;
 388         int eop = (len_left == 0);
 389         dma_addr_t dma_addr;
 390         int err = 0;
 391
 392         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 393                                   PCI_DMA_TODEVICE);
 394         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 395                 return -ENOMEM;
 396
 397         /* Queue the main skb fragment. The fragments are no larger
 398          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 399          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 400          * per fragment is queued.
 401          */
 402         enic_queue_wq_desc(wq, skb, dma_addr, head_len, vlan_tag_insert,
 403                            vlan_tag, eop, loopback);
 404
 405         if (!eop)
 406                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 407
 408         return err;
 409 }
 410
 411 static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
 412                                      struct sk_buff *skb, int vlan_tag_insert,
 413                                      unsigned int vlan_tag, int loopback)
 414 {
 415         unsigned int head_len = skb_headlen(skb);
 416         unsigned int len_left = skb->len - head_len;
 417         unsigned int hdr_len = skb_checksum_start_offset(skb);
 418         unsigned int csum_offset = hdr_len + skb->csum_offset;
 419         int eop = (len_left == 0);
 420         dma_addr_t dma_addr;
 421         int err = 0;
 422
 423         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 424                                   PCI_DMA_TODEVICE);
 425         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 426                 return -ENOMEM;
 427
 428         /* Queue the main skb fragment. The fragments are no larger
 429          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 430          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 431          * per fragment is queued.
 432          */
 433         enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len, csum_offset,
 434                                    hdr_len, vlan_tag_insert, vlan_tag, eop,
 435                                    loopback);
 436
 437         if (!eop)
 438                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 439
 440         return err;
 441 }
 442
 443 static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
 444                                  struct sk_buff *skb, unsigned int mss,
 445                                  int vlan_tag_insert, unsigned int vlan_tag,
 446                                  int loopback)
 447 {
 448         unsigned int frag_len_left = skb_headlen(skb);
 449         unsigned int len_left = skb->len - frag_len_left;
 450         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 451         int eop = (len_left == 0);
 452         unsigned int len;
 453         dma_addr_t dma_addr;
 454         unsigned int offset = 0;
 455         skb_frag_t *frag;
 456
 457         /* Preload TCP csum field with IP pseudo hdr calculated
 458          * with IP length set to zero.  HW will later add in length
 459          * to each TCP segment resulting from the TSO.
 460          */
 461
 462         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 463                 ip_hdr(skb)->check = 0;
 464                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 465                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 466         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 467                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 468                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 469         }
 470
 471         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 472          * for the main skb fragment
 473          */
 474         while (frag_len_left) {
 475                 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 476                 dma_addr = pci_map_single(enic->pdev, skb->data + offset, len,
 477                                           PCI_DMA_TODEVICE);
 478                 if (unlikely(enic_dma_map_check(enic, dma_addr)))
 479                         return -ENOMEM;
 480                 enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len,
 481                                        vlan_tag_insert, vlan_tag,
 482                                        eop && (len == frag_len_left), loopback);
 483                 frag_len_left -= len;
 484                 offset += len;
 485         }
 486
 487         if (eop)
 488                 return 0;
 489
 490         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 491          * for additional data fragments
 492          */
 493         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 494                 len_left -= skb_frag_size(frag);
 495                 frag_len_left = skb_frag_size(frag);
 496                 offset = 0;
 497
 498                 while (frag_len_left) {
 499                         len = min(frag_len_left,
 500                                 (unsigned int)WQ_ENET_MAX_DESC_LEN);
 501                         dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
 502                                                     offset, len,
 503                                                     DMA_TO_DEVICE);
 504                         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 505                                 return -ENOMEM;
 506                         enic_queue_wq_desc_cont(wq, skb, dma_addr, len,
 507                                                 (len_left == 0) &&
 508                                                  (len == frag_len_left),/*EOP*/
 509                                                 loopback);
 510                         frag_len_left -= len;
 511                         offset += len;
 512                 }
 513         }
 514
 515         return 0;
 516 }
 517
 518 static inline void enic_queue_wq_skb(struct enic *enic,
 519         struct vnic_wq *wq, struct sk_buff *skb)
 520 {
 521         unsigned int mss = skb_shinfo(skb)->gso_size;
 522         unsigned int vlan_tag = 0;
 523         int vlan_tag_insert = 0;
 524         int loopback = 0;
 525         int err;
 526
 527         if (skb_vlan_tag_present(skb)) {
 528                 /* VLAN tag from trunking driver */
 529                 vlan_tag_insert = 1;
 530                 vlan_tag = skb_vlan_tag_get(skb);
 531         } else if (enic->loop_enable) {
 532                 vlan_tag = enic->loop_tag;
 533                 loopback = 1;
 534         }
 535
 536         if (mss)
 537                 err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
 538                                             vlan_tag_insert, vlan_tag,
 539                                             loopback);
 540         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 541                 err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
 542                                                 vlan_tag, loopback);
 543         else
 544                 err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert,
 545                                              vlan_tag, loopback);
 546         if (unlikely(err)) {
 547                 struct vnic_wq_buf *buf;
 548
 549                 buf = wq->to_use->prev;
 550                 /* while not EOP of previous pkt && queue not empty.
 551                  * For all non EOP bufs, os_buf is NULL.
 552                  */
 553                 while (!buf->os_buf && (buf->next != wq->to_clean)) {
 554                         enic_free_wq_buf(wq, buf);
 555                         wq->ring.desc_avail++;
 556                         buf = buf->prev;
 557                 }
 558                 wq->to_use = buf->next;
 559                 dev_kfree_skb(skb);
 560         }
 561 }
 562
 563 /* netif_tx_lock held, process context with BHs disabled, or BH */
 564 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 565         struct net_device *netdev)
 566 {
 567         struct enic *enic = netdev_priv(netdev);
 568         struct vnic_wq *wq;
 569         unsigned int txq_map;
 570         struct netdev_queue *txq;
 571
 572         if (skb->len <= 0) {
 573                 dev_kfree_skb_any(skb);
 574                 return NETDEV_TX_OK;
 575         }
 576
 577         txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
 578         wq = &enic->wq[txq_map];
 579         txq = netdev_get_tx_queue(netdev, txq_map);
 580
 581         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 582          * which is very likely.  In the off chance it's going to take
 583          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 584          */
 585
 586         if (skb_shinfo(skb)->gso_size == 0 &&
 587             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 588             skb_linearize(skb)) {
 589                 dev_kfree_skb_any(skb);
 590                 return NETDEV_TX_OK;
 591         }
 592
 593         spin_lock(&enic->wq_lock[txq_map]);
 594
 595         if (vnic_wq_desc_avail(wq) <
 596             skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 597                 netif_tx_stop_queue(txq);
 598                 /* This is a hard error, log it */
 599                 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
 600                 spin_unlock(&enic->wq_lock[txq_map]);
 601                 return NETDEV_TX_BUSY;
 602         }
 603
 604         enic_queue_wq_skb(enic, wq, skb);
 605
 606         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 607                 netif_tx_stop_queue(txq);
 608         if (!skb->xmit_more || netif_xmit_stopped(txq))
 609                 vnic_wq_doorbell(wq);
 610
 611         spin_unlock(&enic->wq_lock[txq_map]);
 612
 613         return NETDEV_TX_OK;
 614 }
 615
 616 /* dev_base_lock rwlock held, nominally process context */
 617 static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev,
 618                                                 struct rtnl_link_stats64 *net_stats)
 619 {
 620         struct enic *enic = netdev_priv(netdev);
 621         struct vnic_stats *stats;
 622         int err;
 623
 624         err = enic_dev_stats_dump(enic, &stats);
 625         /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump
 626          * For other failures, like devcmd failure, we return previously
 627          * recorded stats.
 628          */
 629         if (err == -ENOMEM)
 630                 return net_stats;
 631
 632         net_stats->tx_packets = stats->tx.tx_frames_ok;
 633         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 634         net_stats->tx_errors = stats->tx.tx_errors;
 635         net_stats->tx_dropped = stats->tx.tx_drops;
 636
 637         net_stats->rx_packets = stats->rx.rx_frames_ok;
 638         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 639         net_stats->rx_errors = stats->rx.rx_errors;
 640         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 641         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 642         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 643         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 644
 645         return net_stats;
 646 }
 647
 648 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
 649 {
 650         struct enic *enic = netdev_priv(netdev);
 651
 652         if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
 653                 unsigned int mc_count = netdev_mc_count(netdev);
 654
 655                 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
 656                             ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 657
 658                 return -ENOSPC;
 659         }
 660
 661         enic_dev_add_addr(enic, mc_addr);
 662         enic->mc_count++;
 663
 664         return 0;
 665 }
 666
 667 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
 668 {
 669         struct enic *enic = netdev_priv(netdev);
 670
 671         enic_dev_del_addr(enic, mc_addr);
 672         enic->mc_count--;
 673
 674         return 0;
 675 }
 676
 677 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
 678 {
 679         struct enic *enic = netdev_priv(netdev);
 680
 681         if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
 682                 unsigned int uc_count = netdev_uc_count(netdev);
 683
 684                 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
 685                             ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 686
 687                 return -ENOSPC;
 688         }
 689
 690         enic_dev_add_addr(enic, uc_addr);
 691         enic->uc_count++;
 692
 693         return 0;
 694 }
 695
 696 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
 697 {
 698         struct enic *enic = netdev_priv(netdev);
 699
 700         enic_dev_del_addr(enic, uc_addr);
 701         enic->uc_count--;
 702
 703         return 0;
 704 }
 705
 706 void enic_reset_addr_lists(struct enic *enic)
 707 {
 708         struct net_device *netdev = enic->netdev;
 709
 710         __dev_uc_unsync(netdev, NULL);
 711         __dev_mc_unsync(netdev, NULL);
 712
 713         enic->mc_count = 0;
 714         enic->uc_count = 0;
 715         enic->flags = 0;
 716 }
 717
 718 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 719 {
 720         struct enic *enic = netdev_priv(netdev);
 721
 722         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 723                 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
 724                         return -EADDRNOTAVAIL;
 725         } else {
 726                 if (!is_valid_ether_addr(addr))
 727                         return -EADDRNOTAVAIL;
 728         }
 729
 730         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 731
 732         return 0;
 733 }
 734
 735 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
 736 {
 737         struct enic *enic = netdev_priv(netdev);
 738         struct sockaddr *saddr = p;
 739         char *addr = saddr->sa_data;
 740         int err;
 741
 742         if (netif_running(enic->netdev)) {
 743                 err = enic_dev_del_station_addr(enic);
 744                 if (err)
 745                         return err;
 746         }
 747
 748         err = enic_set_mac_addr(netdev, addr);
 749         if (err)
 750                 return err;
 751
 752         if (netif_running(enic->netdev)) {
 753                 err = enic_dev_add_station_addr(enic);
 754                 if (err)
 755                         return err;
 756         }
 757
 758         return err;
 759 }
 760
 761 static int enic_set_mac_address(struct net_device *netdev, void *p)
 762 {
 763         struct sockaddr *saddr = p;
 764         char *addr = saddr->sa_data;
 765         struct enic *enic = netdev_priv(netdev);
 766         int err;
 767
 768         err = enic_dev_del_station_addr(enic);
 769         if (err)
 770                 return err;
 771
 772         err = enic_set_mac_addr(netdev, addr);
 773         if (err)
 774                 return err;
 775
 776         return enic_dev_add_station_addr(enic);
 777 }
 778
 779 /* netif_tx_lock held, BHs disabled */
 780 static void enic_set_rx_mode(struct net_device *netdev)
 781 {
 782         struct enic *enic = netdev_priv(netdev);
 783         int directed = 1;
 784         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 785         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 786         int promisc = (netdev->flags & IFF_PROMISC) ||
 787                 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
 788         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 789                 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
 790         unsigned int flags = netdev->flags |
 791                 (allmulti ? IFF_ALLMULTI : 0) |
 792                 (promisc ? IFF_PROMISC : 0);
 793
 794         if (enic->flags != flags) {
 795                 enic->flags = flags;
 796                 enic_dev_packet_filter(enic, directed,
 797                         multicast, broadcast, promisc, allmulti);
 798         }
 799
 800         if (!promisc) {
 801                 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
 802                 if (!allmulti)
 803                         __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
 804         }
 805 }
 806
 807 /* netif_tx_lock held, BHs disabled */
 808 static void enic_tx_timeout(struct net_device *netdev)
 809 {
 810         struct enic *enic = netdev_priv(netdev);
 811         schedule_work(&enic->tx_hang_reset);
 812 }
 813
 814 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 815 {
 816         struct enic *enic = netdev_priv(netdev);
 817         struct enic_port_profile *pp;
 818         int err;
 819
 820         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 821         if (err)
 822                 return err;
 823
 824         if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
 825                 if (vf == PORT_SELF_VF) {
 826                         memcpy(pp->vf_mac, mac, ETH_ALEN);
 827                         return 0;
 828                 } else {
 829                         /*
 830                          * For sriov vf's set the mac in hw
 831                          */
 832                         ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 833                                 vnic_dev_set_mac_addr, mac);
 834                         return enic_dev_status_to_errno(err);
 835                 }
 836         } else
 837                 return -EINVAL;
 838 }
 839
 840 static int enic_set_vf_port(struct net_device *netdev, int vf,
 841         struct nlattr *port[])
 842 {
 843         struct enic *enic = netdev_priv(netdev);
 844         struct enic_port_profile prev_pp;
 845         struct enic_port_profile *pp;
 846         int err = 0, restore_pp = 1;
 847
 848         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 849         if (err)
 850                 return err;
 851
 852         if (!port[IFLA_PORT_REQUEST])
 853                 return -EOPNOTSUPP;
 854
 855         memcpy(&prev_pp, pp, sizeof(*enic->pp));
 856         memset(pp, 0, sizeof(*enic->pp));
 857
 858         pp->set |= ENIC_SET_REQUEST;
 859         pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
 860
 861         if (port[IFLA_PORT_PROFILE]) {
 862                 pp->set |= ENIC_SET_NAME;
 863                 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
 864                         PORT_PROFILE_MAX);
 865         }
 866
 867         if (port[IFLA_PORT_INSTANCE_UUID]) {
 868                 pp->set |= ENIC_SET_INSTANCE;
 869                 memcpy(pp->instance_uuid,
 870                         nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
 871         }
 872
 873         if (port[IFLA_PORT_HOST_UUID]) {
 874                 pp->set |= ENIC_SET_HOST;
 875                 memcpy(pp->host_uuid,
 876                         nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
 877         }
 878
 879         if (vf == PORT_SELF_VF) {
 880                 /* Special case handling: mac came from IFLA_VF_MAC */
 881                 if (!is_zero_ether_addr(prev_pp.vf_mac))
 882                         memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
 883
 884                 if (is_zero_ether_addr(netdev->dev_addr))
 885                         eth_hw_addr_random(netdev);
 886         } else {
 887                 /* SR-IOV VF: get mac from adapter */
 888                 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 889                         vnic_dev_get_mac_addr, pp->mac_addr);
 890                 if (err) {
 891                         netdev_err(netdev, "Error getting mac for vf %d\n", vf);
 892                         memcpy(pp, &prev_pp, sizeof(*pp));
 893                         return enic_dev_status_to_errno(err);
 894                 }
 895         }
 896
 897         err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
 898         if (err) {
 899                 if (restore_pp) {
 900                         /* Things are still the way they were: Implicit
 901                          * DISASSOCIATE failed
 902                          */
 903                         memcpy(pp, &prev_pp, sizeof(*pp));
 904                 } else {
 905                         memset(pp, 0, sizeof(*pp));
 906                         if (vf == PORT_SELF_VF)
 907                                 eth_zero_addr(netdev->dev_addr);
 908                 }
 909         } else {
 910                 /* Set flag to indicate that the port assoc/disassoc
 911                  * request has been sent out to fw
 912                  */
 913                 pp->set |= ENIC_PORT_REQUEST_APPLIED;
 914
 915                 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
 916                 if (pp->request == PORT_REQUEST_DISASSOCIATE) {
 917                         eth_zero_addr(pp->mac_addr);
 918                         if (vf == PORT_SELF_VF)
 919                                 eth_zero_addr(netdev->dev_addr);
 920                 }
 921         }
 922
 923         if (vf == PORT_SELF_VF)
 924                 eth_zero_addr(pp->vf_mac);
 925
 926         return err;
 927 }
 928
 929 static int enic_get_vf_port(struct net_device *netdev, int vf,
 930         struct sk_buff *skb)
 931 {
 932         struct enic *enic = netdev_priv(netdev);
 933         u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
 934         struct enic_port_profile *pp;
 935         int err;
 936
 937         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 938         if (err)
 939                 return err;
 940
 941         if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
 942                 return -ENODATA;
 943
 944         err = enic_process_get_pp_request(enic, vf, pp->request, &response);
 945         if (err)
 946                 return err;
 947
 948         if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
 949             nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
 950             ((pp->set & ENIC_SET_NAME) &&
 951              nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
 952             ((pp->set & ENIC_SET_INSTANCE) &&
 953              nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
 954                      pp->instance_uuid)) ||
 955             ((pp->set & ENIC_SET_HOST) &&
 956              nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
 957                 goto nla_put_failure;
 958         return 0;
 959
 960 nla_put_failure:
 961         return -EMSGSIZE;
 962 }
 963
 964 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 965 {
 966         struct enic *enic = vnic_dev_priv(rq->vdev);
 967
 968         if (!buf->os_buf)
 969                 return;
 970
 971         pci_unmap_single(enic->pdev, buf->dma_addr,
 972                 buf->len, PCI_DMA_FROMDEVICE);
 973         dev_kfree_skb_any(buf->os_buf);
 974         buf->os_buf = NULL;
 975 }
 976
 977 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 978 {
 979         struct enic *enic = vnic_dev_priv(rq->vdev);
 980         struct net_device *netdev = enic->netdev;
 981         struct sk_buff *skb;
 982         unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
 983         unsigned int os_buf_index = 0;
 984         dma_addr_t dma_addr;
 985         struct vnic_rq_buf *buf = rq->to_use;
 986
 987         if (buf->os_buf) {
 988                 enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr,
 989                                    buf->len);
 990
 991                 return 0;
 992         }
 993         skb = netdev_alloc_skb_ip_align(netdev, len);
 994         if (!skb)
 995                 return -ENOMEM;
 996
 997         dma_addr = pci_map_single(enic->pdev, skb->data, len,
 998                                   PCI_DMA_FROMDEVICE);
 999         if (unlikely(enic_dma_map_check(enic, dma_addr))) {
1000                 dev_kfree_skb(skb);
1001                 return -ENOMEM;
1002         }
1003
1004         enic_queue_rq_desc(rq, skb, os_buf_index,
1005                 dma_addr, len);
1006
1007         return 0;
1008 }
1009
1010 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1011                                       u32 pkt_len)
1012 {
1013         if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1014                 pkt_size->large_pkt_bytes_cnt += pkt_len;
1015         else
1016                 pkt_size->small_pkt_bytes_cnt += pkt_len;
1017 }
1018
1019 static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb,
1020                              struct vnic_rq_buf *buf, u16 len)
1021 {
1022         struct enic *enic = netdev_priv(netdev);
1023         struct sk_buff *new_skb;
1024
1025         if (len > enic->rx_copybreak)
1026                 return false;
1027         new_skb = netdev_alloc_skb_ip_align(netdev, len);
1028         if (!new_skb)
1029                 return false;
1030         pci_dma_sync_single_for_cpu(enic->pdev, buf->dma_addr, len,
1031                                     DMA_FROM_DEVICE);
1032         memcpy(new_skb->data, (*skb)->data, len);
1033         *skb = new_skb;
1034
1035         return true;
1036 }
1037
1038 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1039         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1040         int skipped, void *opaque)
1041 {
1042         struct enic *enic = vnic_dev_priv(rq->vdev);
1043         struct net_device *netdev = enic->netdev;
1044         struct sk_buff *skb;
1045         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1046
1047         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1048         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1049         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1050         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1051         u8 packet_error;
1052         u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1053         u32 rss_hash;
1054
1055         if (skipped)
1056                 return;
1057
1058         skb = buf->os_buf;
1059
1060         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1061                 &type, &color, &q_number, &completed_index,
1062                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1063                 &csum_not_calc, &rss_hash, &bytes_written,
1064                 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1065                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1066                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1067                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1068                 &fcs_ok);
1069
1070         if (packet_error) {
1071
1072                 if (!fcs_ok) {
1073                         if (bytes_written > 0)
1074                                 enic->rq_bad_fcs++;
1075                         else if (bytes_written == 0)
1076                                 enic->rq_truncated_pkts++;
1077                 }
1078
1079                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1080                                  PCI_DMA_FROMDEVICE);
1081                 dev_kfree_skb_any(skb);
1082                 buf->os_buf = NULL;
1083
1084                 return;
1085         }
1086
1087         if (eop && bytes_written > 0) {
1088
1089                 /* Good receive
1090                  */
1091
1092                 if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) {
1093                         buf->os_buf = NULL;
1094                         pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1095                                          PCI_DMA_FROMDEVICE);
1096                 }
1097                 prefetch(skb->data - NET_IP_ALIGN);
1098
1099                 skb_put(skb, bytes_written);
1100                 skb->protocol = eth_type_trans(skb, netdev);
1101                 skb_record_rx_queue(skb, q_number);
1102                 if (netdev->features & NETIF_F_RXHASH) {
1103                         skb_set_hash(skb, rss_hash,
1104                                      (rss_type &
1105                                       (NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX |
1106                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV6 |
1107                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV4)) ?
1108                                      PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
1109                 }
1110
1111                 /* Hardware does not provide whole packet checksum. It only
1112                  * provides pseudo checksum. Since hw validates the packet
1113                  * checksum but not provide us the checksum value. use
1114                  * CHECSUM_UNNECESSARY.
1115                  */
1116                 if ((netdev->features & NETIF_F_RXCSUM) && tcp_udp_csum_ok &&
1117                     ipv4_csum_ok)
1118                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1119
1120                 if (vlan_stripped)
1121                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1122
1123                 skb_mark_napi_id(skb, &enic->napi[rq->index]);
1124                 if (enic_poll_busy_polling(rq) ||
1125                     !(netdev->features & NETIF_F_GRO))
1126                         netif_receive_skb(skb);
1127                 else
1128                         napi_gro_receive(&enic->napi[q_number], skb);
1129                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1130                         enic_intr_update_pkt_size(&cq->pkt_size_counter,
1131                                                   bytes_written);
1132         } else {
1133
1134                 /* Buffer overflow
1135                  */
1136
1137                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1138                                  PCI_DMA_FROMDEVICE);
1139                 dev_kfree_skb_any(skb);
1140                 buf->os_buf = NULL;
1141         }
1142 }
1143
1144 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1145         u8 type, u16 q_number, u16 completed_index, void *opaque)
1146 {
1147         struct enic *enic = vnic_dev_priv(vdev);
1148
1149         vnic_rq_service(&enic->rq[q_number], cq_desc,
1150                 completed_index, VNIC_RQ_RETURN_DESC,
1151                 enic_rq_indicate_buf, opaque);
1152
1153         return 0;
1154 }
1155
1156 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1157 {
1158         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1159         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1160         u32 timer = cq->tobe_rx_coal_timeval;
1161
1162         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1163                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1164                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1165         }
1166 }
1167
1168 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1169 {
1170         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1171         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1172         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1173         int index;
1174         u32 timer;
1175         u32 range_start;
1176         u32 traffic;
1177         u64 delta;
1178         ktime_t now = ktime_get();
1179
1180         delta = ktime_us_delta(now, cq->prev_ts);
1181         if (delta < ENIC_AIC_TS_BREAK)
1182                 return;
1183         cq->prev_ts = now;
1184
1185         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1186                   pkt_size_counter->small_pkt_bytes_cnt;
1187         /* The table takes Mbps
1188          * traffic *= 8    => bits
1189          * traffic *= (10^6 / delta)    => bps
1190          * traffic /= 10^6     => Mbps
1191          *
1192          * Combining, traffic *= (8 / delta)
1193          */
1194
1195         traffic <<= 3;
1196         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1197
1198         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1199                 if (traffic < mod_table[index].rx_rate)
1200                         break;
1201         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1202                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1203                       rx_coal->small_pkt_range_start :
1204                       rx_coal->large_pkt_range_start;
1205         timer = range_start + ((rx_coal->range_end - range_start) *
1206                                mod_table[index].range_percent / 100);
1207         /* Damping */
1208         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1209
1210         pkt_size_counter->large_pkt_bytes_cnt = 0;
1211         pkt_size_counter->small_pkt_bytes_cnt = 0;
1212 }
1213
1214 static int enic_poll(struct napi_struct *napi, int budget)
1215 {
1216         struct net_device *netdev = napi->dev;
1217         struct enic *enic = netdev_priv(netdev);
1218         unsigned int cq_rq = enic_cq_rq(enic, 0);
1219         unsigned int cq_wq = enic_cq_wq(enic, 0);
1220         unsigned int intr = enic_legacy_io_intr();
1221         unsigned int rq_work_to_do = budget;
1222         unsigned int wq_work_to_do = -1; /* no limit */
1223         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1224         int err;
1225
1226         wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1227                                        enic_wq_service, NULL);
1228
1229         if (!enic_poll_lock_napi(&enic->rq[cq_rq])) {
1230                 if (wq_work_done > 0)
1231                         vnic_intr_return_credits(&enic->intr[intr],
1232                                                  wq_work_done,
1233                                                  0 /* dont unmask intr */,
1234                                                  0 /* dont reset intr timer */);
1235                 return budget;
1236         }
1237
1238         if (budget > 0)
1239                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1240                         rq_work_to_do, enic_rq_service, NULL);
1241
1242         /* Accumulate intr event credits for this polling
1243          * cycle.  An intr event is the completion of a
1244          * a WQ or RQ packet.
1245          */
1246
1247         work_done = rq_work_done + wq_work_done;
1248
1249         if (work_done > 0)
1250                 vnic_intr_return_credits(&enic->intr[intr],
1251                         work_done,
1252                         0 /* don't unmask intr */,
1253                         0 /* don't reset intr timer */);
1254
1255         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1256         enic_poll_unlock_napi(&enic->rq[cq_rq], napi);
1257
1258         /* Buffer allocation failed. Stay in polling
1259          * mode so we can try to fill the ring again.
1260          */
1261
1262         if (err)
1263                 rq_work_done = rq_work_to_do;
1264         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1265                 /* Call the function which refreshes the intr coalescing timer
1266                  * value based on the traffic.
1267                  */
1268                 enic_calc_int_moderation(enic, &enic->rq[0]);
1269
1270         if (rq_work_done < rq_work_to_do) {
1271
1272                 /* Some work done, but not enough to stay in polling,
1273                  * exit polling
1274                  */
1275
1276                 napi_complete(napi);
1277                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1278                         enic_set_int_moderation(enic, &enic->rq[0]);
1279                 vnic_intr_unmask(&enic->intr[intr]);
1280         }
1281
1282         return rq_work_done;
1283 }
1284
1285 #ifdef CONFIG_RFS_ACCEL
1286 static void enic_free_rx_cpu_rmap(struct enic *enic)
1287 {
1288         free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1289         enic->netdev->rx_cpu_rmap = NULL;
1290 }
1291
1292 static void enic_set_rx_cpu_rmap(struct enic *enic)
1293 {
1294         int i, res;
1295
1296         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1297                 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1298                 if (unlikely(!enic->netdev->rx_cpu_rmap))
1299                         return;
1300                 for (i = 0; i < enic->rq_count; i++) {
1301                         res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1302                                                enic->msix_entry[i].vector);
1303                         if (unlikely(res)) {
1304                                 enic_free_rx_cpu_rmap(enic);
1305                                 return;
1306                         }
1307                 }
1308         }
1309 }
1310
1311 #else
1312
1313 static void enic_free_rx_cpu_rmap(struct enic *enic)
1314 {
1315 }
1316
1317 static void enic_set_rx_cpu_rmap(struct enic *enic)
1318 {
1319 }
1320
1321 #endif /* CONFIG_RFS_ACCEL */
1322
1323 #ifdef CONFIG_NET_RX_BUSY_POLL
1324 static int enic_busy_poll(struct napi_struct *napi)
1325 {
1326         struct net_device *netdev = napi->dev;
1327         struct enic *enic = netdev_priv(netdev);
1328         unsigned int rq = (napi - &enic->napi[0]);
1329         unsigned int cq = enic_cq_rq(enic, rq);
1330         unsigned int intr = enic_msix_rq_intr(enic, rq);
1331         unsigned int work_to_do = -1; /* clean all pkts possible */
1332         unsigned int work_done;
1333
1334         if (!enic_poll_lock_poll(&enic->rq[rq]))
1335                 return LL_FLUSH_BUSY;
1336         work_done = vnic_cq_service(&enic->cq[cq], work_to_do,
1337                                     enic_rq_service, NULL);
1338
1339         if (work_done > 0)
1340                 vnic_intr_return_credits(&enic->intr[intr],
1341                                          work_done, 0, 0);
1342         vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1343         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1344                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1345         enic_poll_unlock_poll(&enic->rq[rq]);
1346
1347         return work_done;
1348 }
1349 #endif /* CONFIG_NET_RX_BUSY_POLL */
1350
1351 static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1352 {
1353         struct net_device *netdev = napi->dev;
1354         struct enic *enic = netdev_priv(netdev);
1355         unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1356         struct vnic_wq *wq = &enic->wq[wq_index];
1357         unsigned int cq;
1358         unsigned int intr;
1359         unsigned int wq_work_to_do = -1; /* clean all desc possible */
1360         unsigned int wq_work_done;
1361         unsigned int wq_irq;
1362
1363         wq_irq = wq->index;
1364         cq = enic_cq_wq(enic, wq_irq);
1365         intr = enic_msix_wq_intr(enic, wq_irq);
1366         wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1367                                        enic_wq_service, NULL);
1368
1369         vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1370                                  0 /* don't unmask intr */,
1371                                  1 /* reset intr timer */);
1372         if (!wq_work_done) {
1373                 napi_complete(napi);
1374                 vnic_intr_unmask(&enic->intr[intr]);
1375                 return 0;
1376         }
1377
1378         return budget;
1379 }
1380
1381 static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1382 {
1383         struct net_device *netdev = napi->dev;
1384         struct enic *enic = netdev_priv(netdev);
1385         unsigned int rq = (napi - &enic->napi[0]);
1386         unsigned int cq = enic_cq_rq(enic, rq);
1387         unsigned int intr = enic_msix_rq_intr(enic, rq);
1388         unsigned int work_to_do = budget;
1389         unsigned int work_done = 0;
1390         int err;
1391
1392         if (!enic_poll_lock_napi(&enic->rq[rq]))
1393                 return budget;
1394         /* Service RQ
1395          */
1396
1397         if (budget > 0)
1398                 work_done = vnic_cq_service(&enic->cq[cq],
1399                         work_to_do, enic_rq_service, NULL);
1400
1401         /* Return intr event credits for this polling
1402          * cycle.  An intr event is the completion of a
1403          * RQ packet.
1404          */
1405
1406         if (work_done > 0)
1407                 vnic_intr_return_credits(&enic->intr[intr],
1408                         work_done,
1409                         0 /* don't unmask intr */,
1410                         0 /* don't reset intr timer */);
1411
1412         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1413
1414         /* Buffer allocation failed. Stay in polling mode
1415          * so we can try to fill the ring again.
1416          */
1417
1418         if (err)
1419                 work_done = work_to_do;
1420         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1421                 /* Call the function which refreshes the intr coalescing timer
1422                  * value based on the traffic.
1423                  */
1424                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1425
1426         enic_poll_unlock_napi(&enic->rq[rq], napi);
1427         if (work_done < work_to_do) {
1428
1429                 /* Some work done, but not enough to stay in polling,
1430                  * exit polling
1431                  */
1432
1433                 napi_complete(napi);
1434                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1435                         enic_set_int_moderation(enic, &enic->rq[rq]);
1436                 vnic_intr_unmask(&enic->intr[intr]);
1437         }
1438
1439         return work_done;
1440 }
1441
1442 static void enic_notify_timer(unsigned long data)
1443 {
1444         struct enic *enic = (struct enic *)data;
1445
1446         enic_notify_check(enic);
1447
1448         mod_timer(&enic->notify_timer,
1449                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1450 }
1451
1452 static void enic_free_intr(struct enic *enic)
1453 {
1454         struct net_device *netdev = enic->netdev;
1455         unsigned int i;
1456
1457         enic_free_rx_cpu_rmap(enic);
1458         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1459         case VNIC_DEV_INTR_MODE_INTX:
1460                 free_irq(enic->pdev->irq, netdev);
1461                 break;
1462         case VNIC_DEV_INTR_MODE_MSI:
1463                 free_irq(enic->pdev->irq, enic);
1464                 break;
1465         case VNIC_DEV_INTR_MODE_MSIX:
1466                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1467                         if (enic->msix[i].requested)
1468                                 free_irq(enic->msix_entry[i].vector,
1469                                         enic->msix[i].devid);
1470                 break;
1471         default:
1472                 break;
1473         }
1474 }
1475
1476 static int enic_request_intr(struct enic *enic)
1477 {
1478         struct net_device *netdev = enic->netdev;
1479         unsigned int i, intr;
1480         int err = 0;
1481
1482         enic_set_rx_cpu_rmap(enic);
1483         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1484
1485         case VNIC_DEV_INTR_MODE_INTX:
1486
1487                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1488                         IRQF_SHARED, netdev->name, netdev);
1489                 break;
1490
1491         case VNIC_DEV_INTR_MODE_MSI:
1492
1493                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1494                         0, netdev->name, enic);
1495                 break;
1496
1497         case VNIC_DEV_INTR_MODE_MSIX:
1498
1499                 for (i = 0; i < enic->rq_count; i++) {
1500                         intr = enic_msix_rq_intr(enic, i);
1501                         snprintf(enic->msix[intr].devname,
1502                                 sizeof(enic->msix[intr].devname),
1503                                 "%.11s-rx-%d", netdev->name, i);
1504                         enic->msix[intr].isr = enic_isr_msix;
1505                         enic->msix[intr].devid = &enic->napi[i];
1506                 }
1507
1508                 for (i = 0; i < enic->wq_count; i++) {
1509                         int wq = enic_cq_wq(enic, i);
1510
1511                         intr = enic_msix_wq_intr(enic, i);
1512                         snprintf(enic->msix[intr].devname,
1513                                 sizeof(enic->msix[intr].devname),
1514                                 "%.11s-tx-%d", netdev->name, i);
1515                         enic->msix[intr].isr = enic_isr_msix;
1516                         enic->msix[intr].devid = &enic->napi[wq];
1517                 }
1518
1519                 intr = enic_msix_err_intr(enic);
1520                 snprintf(enic->msix[intr].devname,
1521                         sizeof(enic->msix[intr].devname),
1522                         "%.11s-err", netdev->name);
1523                 enic->msix[intr].isr = enic_isr_msix_err;
1524                 enic->msix[intr].devid = enic;
1525
1526                 intr = enic_msix_notify_intr(enic);
1527                 snprintf(enic->msix[intr].devname,
1528                         sizeof(enic->msix[intr].devname),
1529                         "%.11s-notify", netdev->name);
1530                 enic->msix[intr].isr = enic_isr_msix_notify;
1531                 enic->msix[intr].devid = enic;
1532
1533                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1534                         enic->msix[i].requested = 0;
1535
1536                 for (i = 0; i < enic->intr_count; i++) {
1537                         err = request_irq(enic->msix_entry[i].vector,
1538                                 enic->msix[i].isr, 0,
1539                                 enic->msix[i].devname,
1540                                 enic->msix[i].devid);
1541                         if (err) {
1542                                 enic_free_intr(enic);
1543                                 break;
1544                         }
1545                         enic->msix[i].requested = 1;
1546                 }
1547
1548                 break;
1549
1550         default:
1551                 break;
1552         }
1553
1554         return err;
1555 }
1556
1557 static void enic_synchronize_irqs(struct enic *enic)
1558 {
1559         unsigned int i;
1560
1561         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1562         case VNIC_DEV_INTR_MODE_INTX:
1563         case VNIC_DEV_INTR_MODE_MSI:
1564                 synchronize_irq(enic->pdev->irq);
1565                 break;
1566         case VNIC_DEV_INTR_MODE_MSIX:
1567                 for (i = 0; i < enic->intr_count; i++)
1568                         synchronize_irq(enic->msix_entry[i].vector);
1569                 break;
1570         default:
1571                 break;
1572         }
1573 }
1574
1575 static void enic_set_rx_coal_setting(struct enic *enic)
1576 {
1577         unsigned int speed;
1578         int index = -1;
1579         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1580
1581         /* 1. Read the link speed from fw
1582          * 2. Pick the default range for the speed
1583          * 3. Update it in enic->rx_coalesce_setting
1584          */
1585         speed = vnic_dev_port_speed(enic->vdev);
1586         if (ENIC_LINK_SPEED_10G < speed)
1587                 index = ENIC_LINK_40G_INDEX;
1588         else if (ENIC_LINK_SPEED_4G < speed)
1589                 index = ENIC_LINK_10G_INDEX;
1590         else
1591                 index = ENIC_LINK_4G_INDEX;
1592
1593         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1594         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1595         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1596
1597         /* Start with the value provided by UCSM */
1598         for (index = 0; index < enic->rq_count; index++)
1599                 enic->cq[index].cur_rx_coal_timeval =
1600                                 enic->config.intr_timer_usec;
1601
1602         rx_coal->use_adaptive_rx_coalesce = 1;
1603 }
1604
1605 static int enic_dev_notify_set(struct enic *enic)
1606 {
1607         int err;
1608
1609         spin_lock_bh(&enic->devcmd_lock);
1610         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1611         case VNIC_DEV_INTR_MODE_INTX:
1612                 err = vnic_dev_notify_set(enic->vdev,
1613                         enic_legacy_notify_intr());
1614                 break;
1615         case VNIC_DEV_INTR_MODE_MSIX:
1616                 err = vnic_dev_notify_set(enic->vdev,
1617                         enic_msix_notify_intr(enic));
1618                 break;
1619         default:
1620                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1621                 break;
1622         }
1623         spin_unlock_bh(&enic->devcmd_lock);
1624
1625         return err;
1626 }
1627
1628 static void enic_notify_timer_start(struct enic *enic)
1629 {
1630         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1631         case VNIC_DEV_INTR_MODE_MSI:
1632                 mod_timer(&enic->notify_timer, jiffies);
1633                 break;
1634         default:
1635                 /* Using intr for notification for INTx/MSI-X */
1636                 break;
1637         }
1638 }
1639
1640 /* rtnl lock is held, process context */
1641 static int enic_open(struct net_device *netdev)
1642 {
1643         struct enic *enic = netdev_priv(netdev);
1644         unsigned int i;
1645         int err;
1646
1647         err = enic_request_intr(enic);
1648         if (err) {
1649                 netdev_err(netdev, "Unable to request irq.\n");
1650                 return err;
1651         }
1652
1653         err = enic_dev_notify_set(enic);
1654         if (err) {
1655                 netdev_err(netdev,
1656                         "Failed to alloc notify buffer, aborting.\n");
1657                 goto err_out_free_intr;
1658         }
1659
1660         for (i = 0; i < enic->rq_count; i++) {
1661                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1662                 /* Need at least one buffer on ring to get going */
1663                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1664                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1665                         err = -ENOMEM;
1666                         goto err_out_free_rq;
1667                 }
1668         }
1669
1670         for (i = 0; i < enic->wq_count; i++)
1671                 vnic_wq_enable(&enic->wq[i]);
1672         for (i = 0; i < enic->rq_count; i++)
1673                 vnic_rq_enable(&enic->rq[i]);
1674
1675         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1676                 enic_dev_add_station_addr(enic);
1677
1678         enic_set_rx_mode(netdev);
1679
1680         netif_tx_wake_all_queues(netdev);
1681
1682         for (i = 0; i < enic->rq_count; i++) {
1683                 enic_busy_poll_init_lock(&enic->rq[i]);
1684                 napi_enable(&enic->napi[i]);
1685         }
1686         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1687                 for (i = 0; i < enic->wq_count; i++)
1688                         napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1689         enic_dev_enable(enic);
1690
1691         for (i = 0; i < enic->intr_count; i++)
1692                 vnic_intr_unmask(&enic->intr[i]);
1693
1694         enic_notify_timer_start(enic);
1695         enic_rfs_flw_tbl_init(enic);
1696
1697         return 0;
1698
1699 err_out_free_rq:
1700         for (i = 0; i < enic->rq_count; i++)
1701                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1702         enic_dev_notify_unset(enic);
1703 err_out_free_intr:
1704         enic_free_intr(enic);
1705
1706         return err;
1707 }
1708
1709 /* rtnl lock is held, process context */
1710 static int enic_stop(struct net_device *netdev)
1711 {
1712         struct enic *enic = netdev_priv(netdev);
1713         unsigned int i;
1714         int err;
1715
1716         for (i = 0; i < enic->intr_count; i++) {
1717                 vnic_intr_mask(&enic->intr[i]);
1718                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1719         }
1720
1721         enic_synchronize_irqs(enic);
1722
1723         del_timer_sync(&enic->notify_timer);
1724         enic_rfs_flw_tbl_free(enic);
1725
1726         enic_dev_disable(enic);
1727
1728         for (i = 0; i < enic->rq_count; i++) {
1729                 napi_disable(&enic->napi[i]);
1730                 local_bh_disable();
1731                 while (!enic_poll_lock_napi(&enic->rq[i]))
1732                         mdelay(1);
1733                 local_bh_enable();
1734         }
1735
1736         netif_carrier_off(netdev);
1737         netif_tx_disable(netdev);
1738         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1739                 for (i = 0; i < enic->wq_count; i++)
1740                         napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
1741
1742         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1743                 enic_dev_del_station_addr(enic);
1744
1745         for (i = 0; i < enic->wq_count; i++) {
1746                 err = vnic_wq_disable(&enic->wq[i]);
1747                 if (err)
1748                         return err;
1749         }
1750         for (i = 0; i < enic->rq_count; i++) {
1751                 err = vnic_rq_disable(&enic->rq[i]);
1752                 if (err)
1753                         return err;
1754         }
1755
1756         enic_dev_notify_unset(enic);
1757         enic_free_intr(enic);
1758
1759         for (i = 0; i < enic->wq_count; i++)
1760                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1761         for (i = 0; i < enic->rq_count; i++)
1762                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1763         for (i = 0; i < enic->cq_count; i++)
1764                 vnic_cq_clean(&enic->cq[i]);
1765         for (i = 0; i < enic->intr_count; i++)
1766                 vnic_intr_clean(&enic->intr[i]);
1767
1768         return 0;
1769 }
1770
1771 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1772 {
1773         struct enic *enic = netdev_priv(netdev);
1774         int running = netif_running(netdev);
1775
1776         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1777                 return -EINVAL;
1778
1779         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
1780                 return -EOPNOTSUPP;
1781
1782         if (running)
1783                 enic_stop(netdev);
1784
1785         netdev->mtu = new_mtu;
1786
1787         if (netdev->mtu > enic->port_mtu)
1788                 netdev_warn(netdev,
1789                         "interface MTU (%d) set higher than port MTU (%d)\n",
1790                         netdev->mtu, enic->port_mtu);
1791
1792         if (running)
1793                 enic_open(netdev);
1794
1795         return 0;
1796 }
1797
1798 static void enic_change_mtu_work(struct work_struct *work)
1799 {
1800         struct enic *enic = container_of(work, struct enic, change_mtu_work);
1801         struct net_device *netdev = enic->netdev;
1802         int new_mtu = vnic_dev_mtu(enic->vdev);
1803         int err;
1804         unsigned int i;
1805
1806         new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1807
1808         rtnl_lock();
1809
1810         /* Stop RQ */
1811         del_timer_sync(&enic->notify_timer);
1812
1813         for (i = 0; i < enic->rq_count; i++)
1814                 napi_disable(&enic->napi[i]);
1815
1816         vnic_intr_mask(&enic->intr[0]);
1817         enic_synchronize_irqs(enic);
1818         err = vnic_rq_disable(&enic->rq[0]);
1819         if (err) {
1820                 rtnl_unlock();
1821                 netdev_err(netdev, "Unable to disable RQ.\n");
1822                 return;
1823         }
1824         vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1825         vnic_cq_clean(&enic->cq[0]);
1826         vnic_intr_clean(&enic->intr[0]);
1827
1828         /* Fill RQ with new_mtu-sized buffers */
1829         netdev->mtu = new_mtu;
1830         vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1831         /* Need at least one buffer on ring to get going */
1832         if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1833                 rtnl_unlock();
1834                 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1835                 return;
1836         }
1837
1838         /* Start RQ */
1839         vnic_rq_enable(&enic->rq[0]);
1840         napi_enable(&enic->napi[0]);
1841         vnic_intr_unmask(&enic->intr[0]);
1842         enic_notify_timer_start(enic);
1843
1844         rtnl_unlock();
1845
1846         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1847 }
1848
1849 #ifdef CONFIG_NET_POLL_CONTROLLER
1850 static void enic_poll_controller(struct net_device *netdev)
1851 {
1852         struct enic *enic = netdev_priv(netdev);
1853         struct vnic_dev *vdev = enic->vdev;
1854         unsigned int i, intr;
1855
1856         switch (vnic_dev_get_intr_mode(vdev)) {
1857         case VNIC_DEV_INTR_MODE_MSIX:
1858                 for (i = 0; i < enic->rq_count; i++) {
1859                         intr = enic_msix_rq_intr(enic, i);
1860                         enic_isr_msix(enic->msix_entry[intr].vector,
1861                                       &enic->napi[i]);
1862                 }
1863
1864                 for (i = 0; i < enic->wq_count; i++) {
1865                         intr = enic_msix_wq_intr(enic, i);
1866                         enic_isr_msix(enic->msix_entry[intr].vector,
1867                                       &enic->napi[enic_cq_wq(enic, i)]);
1868                 }
1869
1870                 break;
1871         case VNIC_DEV_INTR_MODE_MSI:
1872                 enic_isr_msi(enic->pdev->irq, enic);
1873                 break;
1874         case VNIC_DEV_INTR_MODE_INTX:
1875                 enic_isr_legacy(enic->pdev->irq, netdev);
1876                 break;
1877         default:
1878                 break;
1879         }
1880 }
1881 #endif
1882
1883 static int enic_dev_wait(struct vnic_dev *vdev,
1884         int (*start)(struct vnic_dev *, int),
1885         int (*finished)(struct vnic_dev *, int *),
1886         int arg)
1887 {
1888         unsigned long time;
1889         int done;
1890         int err;
1891
1892         BUG_ON(in_interrupt());
1893
1894         err = start(vdev, arg);
1895         if (err)
1896                 return err;
1897
1898         /* Wait for func to complete...2 seconds max
1899          */
1900
1901         time = jiffies + (HZ * 2);
1902         do {
1903
1904                 err = finished(vdev, &done);
1905                 if (err)
1906                         return err;
1907
1908                 if (done)
1909                         return 0;
1910
1911                 schedule_timeout_uninterruptible(HZ / 10);
1912
1913         } while (time_after(time, jiffies));
1914
1915         return -ETIMEDOUT;
1916 }
1917
1918 static int enic_dev_open(struct enic *enic)
1919 {
1920         int err;
1921
1922         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1923                 vnic_dev_open_done, 0);
1924         if (err)
1925                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1926                         err);
1927
1928         return err;
1929 }
1930
1931 static int enic_dev_soft_reset(struct enic *enic)
1932 {
1933         int err;
1934
1935         err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
1936                             vnic_dev_soft_reset_done, 0);
1937         if (err)
1938                 netdev_err(enic->netdev, "vNIC soft reset failed, err %d\n",
1939                            err);
1940
1941         return err;
1942 }
1943
1944 static int enic_dev_hang_reset(struct enic *enic)
1945 {
1946         int err;
1947
1948         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1949                 vnic_dev_hang_reset_done, 0);
1950         if (err)
1951                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1952                         err);
1953
1954         return err;
1955 }
1956
1957 int __enic_set_rsskey(struct enic *enic)
1958 {
1959         union vnic_rss_key *rss_key_buf_va;
1960         dma_addr_t rss_key_buf_pa;
1961         int i, kidx, bidx, err;
1962
1963         rss_key_buf_va = pci_zalloc_consistent(enic->pdev,
1964                                                sizeof(union vnic_rss_key),
1965                                                &rss_key_buf_pa);
1966         if (!rss_key_buf_va)
1967                 return -ENOMEM;
1968
1969         for (i = 0; i < ENIC_RSS_LEN; i++) {
1970                 kidx = i / ENIC_RSS_BYTES_PER_KEY;
1971                 bidx = i % ENIC_RSS_BYTES_PER_KEY;
1972                 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
1973         }
1974         spin_lock_bh(&enic->devcmd_lock);
1975         err = enic_set_rss_key(enic,
1976                 rss_key_buf_pa,
1977                 sizeof(union vnic_rss_key));
1978         spin_unlock_bh(&enic->devcmd_lock);
1979
1980         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1981                 rss_key_buf_va, rss_key_buf_pa);
1982
1983         return err;
1984 }
1985
1986 static int enic_set_rsskey(struct enic *enic)
1987 {
1988         netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
1989
1990         return __enic_set_rsskey(enic);
1991 }
1992
1993 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1994 {
1995         dma_addr_t rss_cpu_buf_pa;
1996         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1997         unsigned int i;
1998         int err;
1999
2000         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
2001                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
2002         if (!rss_cpu_buf_va)
2003                 return -ENOMEM;
2004
2005         for (i = 0; i < (1 << rss_hash_bits); i++)
2006                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
2007
2008         spin_lock_bh(&enic->devcmd_lock);
2009         err = enic_set_rss_cpu(enic,
2010                 rss_cpu_buf_pa,
2011                 sizeof(union vnic_rss_cpu));
2012         spin_unlock_bh(&enic->devcmd_lock);
2013
2014         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
2015                 rss_cpu_buf_va, rss_cpu_buf_pa);
2016
2017         return err;
2018 }
2019
2020 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
2021         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
2022 {
2023         const u8 tso_ipid_split_en = 0;
2024         const u8 ig_vlan_strip_en = 1;
2025         int err;
2026
2027         /* Enable VLAN tag stripping.
2028         */
2029
2030         spin_lock_bh(&enic->devcmd_lock);
2031         err = enic_set_nic_cfg(enic,
2032                 rss_default_cpu, rss_hash_type,
2033                 rss_hash_bits, rss_base_cpu,
2034                 rss_enable, tso_ipid_split_en,
2035                 ig_vlan_strip_en);
2036         spin_unlock_bh(&enic->devcmd_lock);
2037
2038         return err;
2039 }
2040
2041 static int enic_set_rss_nic_cfg(struct enic *enic)
2042 {
2043         struct device *dev = enic_get_dev(enic);
2044         const u8 rss_default_cpu = 0;
2045         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
2046                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
2047                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
2048                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2049         const u8 rss_hash_bits = 7;
2050         const u8 rss_base_cpu = 0;
2051         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2052
2053         if (rss_enable) {
2054                 if (!enic_set_rsskey(enic)) {
2055                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
2056                                 rss_enable = 0;
2057                                 dev_warn(dev, "RSS disabled, "
2058                                         "Failed to set RSS cpu indirection table.");
2059                         }
2060                 } else {
2061                         rss_enable = 0;
2062                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2063                 }
2064         }
2065
2066         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2067                 rss_hash_bits, rss_base_cpu, rss_enable);
2068 }
2069
2070 static void enic_reset(struct work_struct *work)
2071 {
2072         struct enic *enic = container_of(work, struct enic, reset);
2073
2074         if (!netif_running(enic->netdev))
2075                 return;
2076
2077         rtnl_lock();
2078
2079         spin_lock(&enic->enic_api_lock);
2080         enic_stop(enic->netdev);
2081         enic_dev_soft_reset(enic);
2082         enic_reset_addr_lists(enic);
2083         enic_init_vnic_resources(enic);
2084         enic_set_rss_nic_cfg(enic);
2085         enic_dev_set_ig_vlan_rewrite_mode(enic);
2086         enic_open(enic->netdev);
2087         spin_unlock(&enic->enic_api_lock);
2088         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2089
2090         rtnl_unlock();
2091 }
2092
2093 static void enic_tx_hang_reset(struct work_struct *work)
2094 {
2095         struct enic *enic = container_of(work, struct enic, tx_hang_reset);
2096
2097         rtnl_lock();
2098
2099         spin_lock(&enic->enic_api_lock);
2100         enic_dev_hang_notify(enic);
2101         enic_stop(enic->netdev);
2102         enic_dev_hang_reset(enic);
2103         enic_reset_addr_lists(enic);
2104         enic_init_vnic_resources(enic);
2105         enic_set_rss_nic_cfg(enic);
2106         enic_dev_set_ig_vlan_rewrite_mode(enic);
2107         enic_open(enic->netdev);
2108         spin_unlock(&enic->enic_api_lock);
2109         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2110
2111         rtnl_unlock();
2112 }
2113
2114 static int enic_set_intr_mode(struct enic *enic)
2115 {
2116         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2117         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2118         unsigned int i;
2119
2120         /* Set interrupt mode (INTx, MSI, MSI-X) depending
2121          * on system capabilities.
2122          *
2123          * Try MSI-X first
2124          *
2125          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2126          * (the second to last INTR is used for WQ/RQ errors)
2127          * (the last INTR is used for notifications)
2128          */
2129
2130         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2131         for (i = 0; i < n + m + 2; i++)
2132                 enic->msix_entry[i].entry = i;
2133
2134         /* Use multiple RQs if RSS is enabled
2135          */
2136
2137         if (ENIC_SETTING(enic, RSS) &&
2138             enic->config.intr_mode < 1 &&
2139             enic->rq_count >= n &&
2140             enic->wq_count >= m &&
2141             enic->cq_count >= n + m &&
2142             enic->intr_count >= n + m + 2) {
2143
2144                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2145                                           n + m + 2, n + m + 2) > 0) {
2146
2147                         enic->rq_count = n;
2148                         enic->wq_count = m;
2149                         enic->cq_count = n + m;
2150                         enic->intr_count = n + m + 2;
2151
2152                         vnic_dev_set_intr_mode(enic->vdev,
2153                                 VNIC_DEV_INTR_MODE_MSIX);
2154
2155                         return 0;
2156                 }
2157         }
2158
2159         if (enic->config.intr_mode < 1 &&
2160             enic->rq_count >= 1 &&
2161             enic->wq_count >= m &&
2162             enic->cq_count >= 1 + m &&
2163             enic->intr_count >= 1 + m + 2) {
2164                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2165                                           1 + m + 2, 1 + m + 2) > 0) {
2166
2167                         enic->rq_count = 1;
2168                         enic->wq_count = m;
2169                         enic->cq_count = 1 + m;
2170                         enic->intr_count = 1 + m + 2;
2171
2172                         vnic_dev_set_intr_mode(enic->vdev,
2173                                 VNIC_DEV_INTR_MODE_MSIX);
2174
2175                         return 0;
2176                 }
2177         }
2178
2179         /* Next try MSI
2180          *
2181          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2182          */
2183
2184         if (enic->config.intr_mode < 2 &&
2185             enic->rq_count >= 1 &&
2186             enic->wq_count >= 1 &&
2187             enic->cq_count >= 2 &&
2188             enic->intr_count >= 1 &&
2189             !pci_enable_msi(enic->pdev)) {
2190
2191                 enic->rq_count = 1;
2192                 enic->wq_count = 1;
2193                 enic->cq_count = 2;
2194                 enic->intr_count = 1;
2195
2196                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2197
2198                 return 0;
2199         }
2200
2201         /* Next try INTx
2202          *
2203          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2204          * (the first INTR is used for WQ/RQ)
2205          * (the second INTR is used for WQ/RQ errors)
2206          * (the last INTR is used for notifications)
2207          */
2208
2209         if (enic->config.intr_mode < 3 &&
2210             enic->rq_count >= 1 &&
2211             enic->wq_count >= 1 &&
2212             enic->cq_count >= 2 &&
2213             enic->intr_count >= 3) {
2214
2215                 enic->rq_count = 1;
2216                 enic->wq_count = 1;
2217                 enic->cq_count = 2;
2218                 enic->intr_count = 3;
2219
2220                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2221
2222                 return 0;
2223         }
2224
2225         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2226
2227         return -EINVAL;
2228 }
2229
2230 static void enic_clear_intr_mode(struct enic *enic)
2231 {
2232         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2233         case VNIC_DEV_INTR_MODE_MSIX:
2234                 pci_disable_msix(enic->pdev);
2235                 break;
2236         case VNIC_DEV_INTR_MODE_MSI:
2237                 pci_disable_msi(enic->pdev);
2238                 break;
2239         default:
2240                 break;
2241         }
2242
2243         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2244 }
2245
2246 static const struct net_device_ops enic_netdev_dynamic_ops = {
2247         .ndo_open               = enic_open,
2248         .ndo_stop               = enic_stop,
2249         .ndo_start_xmit         = enic_hard_start_xmit,
2250         .ndo_get_stats64        = enic_get_stats,
2251         .ndo_validate_addr      = eth_validate_addr,
2252         .ndo_set_rx_mode        = enic_set_rx_mode,
2253         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2254         .ndo_change_mtu         = enic_change_mtu,
2255         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2256         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2257         .ndo_tx_timeout         = enic_tx_timeout,
2258         .ndo_set_vf_port        = enic_set_vf_port,
2259         .ndo_get_vf_port        = enic_get_vf_port,
2260         .ndo_set_vf_mac         = enic_set_vf_mac,
2261 #ifdef CONFIG_NET_POLL_CONTROLLER
2262         .ndo_poll_controller    = enic_poll_controller,
2263 #endif
2264 #ifdef CONFIG_RFS_ACCEL
2265         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2266 #endif
2267 #ifdef CONFIG_NET_RX_BUSY_POLL
2268         .ndo_busy_poll          = enic_busy_poll,
2269 #endif
2270 };
2271
2272 static const struct net_device_ops enic_netdev_ops = {
2273         .ndo_open               = enic_open,
2274         .ndo_stop               = enic_stop,
2275         .ndo_start_xmit         = enic_hard_start_xmit,
2276         .ndo_get_stats64        = enic_get_stats,
2277         .ndo_validate_addr      = eth_validate_addr,
2278         .ndo_set_mac_address    = enic_set_mac_address,
2279         .ndo_set_rx_mode        = enic_set_rx_mode,
2280         .ndo_change_mtu         = enic_change_mtu,
2281         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2282         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2283         .ndo_tx_timeout         = enic_tx_timeout,
2284         .ndo_set_vf_port        = enic_set_vf_port,
2285         .ndo_get_vf_port        = enic_get_vf_port,
2286         .ndo_set_vf_mac         = enic_set_vf_mac,
2287 #ifdef CONFIG_NET_POLL_CONTROLLER
2288         .ndo_poll_controller    = enic_poll_controller,
2289 #endif
2290 #ifdef CONFIG_RFS_ACCEL
2291         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2292 #endif
2293 #ifdef CONFIG_NET_RX_BUSY_POLL
2294         .ndo_busy_poll          = enic_busy_poll,
2295 #endif
2296 };
2297
2298 static void enic_dev_deinit(struct enic *enic)
2299 {
2300         unsigned int i;
2301
2302         for (i = 0; i < enic->rq_count; i++) {
2303                 napi_hash_del(&enic->napi[i]);
2304                 netif_napi_del(&enic->napi[i]);
2305         }
2306         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2307                 for (i = 0; i < enic->wq_count; i++)
2308                         netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2309
2310         enic_free_vnic_resources(enic);
2311         enic_clear_intr_mode(enic);
2312 }
2313
2314 static void enic_kdump_kernel_config(struct enic *enic)
2315 {
2316         if (is_kdump_kernel()) {
2317                 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2318                 enic->rq_count = 1;
2319                 enic->wq_count = 1;
2320                 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2321                 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2322                 enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2323         }
2324 }
2325
2326 static int enic_dev_init(struct enic *enic)
2327 {
2328         struct device *dev = enic_get_dev(enic);
2329         struct net_device *netdev = enic->netdev;
2330         unsigned int i;
2331         int err;
2332
2333         /* Get interrupt coalesce timer info */
2334         err = enic_dev_intr_coal_timer_info(enic);
2335         if (err) {
2336                 dev_warn(dev, "Using default conversion factor for "
2337                         "interrupt coalesce timer\n");
2338                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2339         }
2340
2341         /* Get vNIC configuration
2342          */
2343
2344         err = enic_get_vnic_config(enic);
2345         if (err) {
2346                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2347                 return err;
2348         }
2349
2350         /* Get available resource counts
2351          */
2352
2353         enic_get_res_counts(enic);
2354
2355         /* modify resource count if we are in kdump_kernel
2356          */
2357         enic_kdump_kernel_config(enic);
2358
2359         /* Set interrupt mode based on resource counts and system
2360          * capabilities
2361          */
2362
2363         err = enic_set_intr_mode(enic);
2364         if (err) {
2365                 dev_err(dev, "Failed to set intr mode based on resource "
2366                         "counts and system capabilities, aborting\n");
2367                 return err;
2368         }
2369
2370         /* Allocate and configure vNIC resources
2371          */
2372
2373         err = enic_alloc_vnic_resources(enic);
2374         if (err) {
2375                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2376                 goto err_out_free_vnic_resources;
2377         }
2378
2379         enic_init_vnic_resources(enic);
2380
2381         err = enic_set_rss_nic_cfg(enic);
2382         if (err) {
2383                 dev_err(dev, "Failed to config nic, aborting\n");
2384                 goto err_out_free_vnic_resources;
2385         }
2386
2387         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2388         default:
2389                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2390                 napi_hash_add(&enic->napi[0]);
2391                 break;
2392         case VNIC_DEV_INTR_MODE_MSIX:
2393                 for (i = 0; i < enic->rq_count; i++) {
2394                         netif_napi_add(netdev, &enic->napi[i],
2395                                 enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2396                         napi_hash_add(&enic->napi[i]);
2397                 }
2398                 for (i = 0; i < enic->wq_count; i++)
2399                         netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2400                                        enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2401                 break;
2402         }
2403
2404         return 0;
2405
2406 err_out_free_vnic_resources:
2407         enic_clear_intr_mode(enic);
2408         enic_free_vnic_resources(enic);
2409
2410         return err;
2411 }
2412
2413 static void enic_iounmap(struct enic *enic)
2414 {
2415         unsigned int i;
2416
2417         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2418                 if (enic->bar[i].vaddr)
2419                         iounmap(enic->bar[i].vaddr);
2420 }
2421
2422 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2423 {
2424         struct device *dev = &pdev->dev;
2425         struct net_device *netdev;
2426         struct enic *enic;
2427         int using_dac = 0;
2428         unsigned int i;
2429         int err;
2430 #ifdef CONFIG_PCI_IOV
2431         int pos = 0;
2432 #endif
2433         int num_pps = 1;
2434
2435         /* Allocate net device structure and initialize.  Private
2436          * instance data is initialized to zero.
2437          */
2438
2439         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2440                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2441         if (!netdev)
2442                 return -ENOMEM;
2443
2444         pci_set_drvdata(pdev, netdev);
2445
2446         SET_NETDEV_DEV(netdev, &pdev->dev);
2447
2448         enic = netdev_priv(netdev);
2449         enic->netdev = netdev;
2450         enic->pdev = pdev;
2451
2452         /* Setup PCI resources
2453          */
2454
2455         err = pci_enable_device_mem(pdev);
2456         if (err) {
2457                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2458                 goto err_out_free_netdev;
2459         }
2460
2461         err = pci_request_regions(pdev, DRV_NAME);
2462         if (err) {
2463                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2464                 goto err_out_disable_device;
2465         }
2466
2467         pci_set_master(pdev);
2468
2469         /* Query PCI controller on system for DMA addressing
2470          * limitation for the device.  Try 64-bit first, and
2471          * fail to 32-bit.
2472          */
2473
2474         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
2475         if (err) {
2476                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2477                 if (err) {
2478                         dev_err(dev, "No usable DMA configuration, aborting\n");
2479                         goto err_out_release_regions;
2480                 }
2481                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2482                 if (err) {
2483                         dev_err(dev, "Unable to obtain %u-bit DMA "
2484                                 "for consistent allocations, aborting\n", 32);
2485                         goto err_out_release_regions;
2486                 }
2487         } else {
2488                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
2489                 if (err) {
2490                         dev_err(dev, "Unable to obtain %u-bit DMA "
2491                                 "for consistent allocations, aborting\n", 64);
2492                         goto err_out_release_regions;
2493                 }
2494                 using_dac = 1;
2495         }
2496
2497         /* Map vNIC resources from BAR0-5
2498          */
2499
2500         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2501                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2502                         continue;
2503                 enic->bar[i].len = pci_resource_len(pdev, i);
2504                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2505                 if (!enic->bar[i].vaddr) {
2506                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2507                         err = -ENODEV;
2508                         goto err_out_iounmap;
2509                 }
2510                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2511         }
2512
2513         /* Register vNIC device
2514          */
2515
2516         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2517                 ARRAY_SIZE(enic->bar));
2518         if (!enic->vdev) {
2519                 dev_err(dev, "vNIC registration failed, aborting\n");
2520                 err = -ENODEV;
2521                 goto err_out_iounmap;
2522         }
2523
2524         err = vnic_devcmd_init(enic->vdev);
2525
2526         if (err)
2527                 goto err_out_vnic_unregister;
2528
2529 #ifdef CONFIG_PCI_IOV
2530         /* Get number of subvnics */
2531         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2532         if (pos) {
2533                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2534                         &enic->num_vfs);
2535                 if (enic->num_vfs) {
2536                         err = pci_enable_sriov(pdev, enic->num_vfs);
2537                         if (err) {
2538                                 dev_err(dev, "SRIOV enable failed, aborting."
2539                                         " pci_enable_sriov() returned %d\n",
2540                                         err);
2541                                 goto err_out_vnic_unregister;
2542                         }
2543                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2544                         num_pps = enic->num_vfs;
2545                 }
2546         }
2547 #endif
2548
2549         /* Allocate structure for port profiles */
2550         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2551         if (!enic->pp) {
2552                 err = -ENOMEM;
2553                 goto err_out_disable_sriov_pp;
2554         }
2555
2556         /* Issue device open to get device in known state
2557          */
2558
2559         err = enic_dev_open(enic);
2560         if (err) {
2561                 dev_err(dev, "vNIC dev open failed, aborting\n");
2562                 goto err_out_disable_sriov;
2563         }
2564
2565         /* Setup devcmd lock
2566          */
2567
2568         spin_lock_init(&enic->devcmd_lock);
2569         spin_lock_init(&enic->enic_api_lock);
2570
2571         /*
2572          * Set ingress vlan rewrite mode before vnic initialization
2573          */
2574
2575         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2576         if (err) {
2577                 dev_err(dev,
2578                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2579                 goto err_out_dev_close;
2580         }
2581
2582         /* Issue device init to initialize the vnic-to-switch link.
2583          * We'll start with carrier off and wait for link UP
2584          * notification later to turn on carrier.  We don't need
2585          * to wait here for the vnic-to-switch link initialization
2586          * to complete; link UP notification is the indication that
2587          * the process is complete.
2588          */
2589
2590         netif_carrier_off(netdev);
2591
2592         /* Do not call dev_init for a dynamic vnic.
2593          * For a dynamic vnic, init_prov_info will be
2594          * called later by an upper layer.
2595          */
2596
2597         if (!enic_is_dynamic(enic)) {
2598                 err = vnic_dev_init(enic->vdev, 0);
2599                 if (err) {
2600                         dev_err(dev, "vNIC dev init failed, aborting\n");
2601                         goto err_out_dev_close;
2602                 }
2603         }
2604
2605         err = enic_dev_init(enic);
2606         if (err) {
2607                 dev_err(dev, "Device initialization failed, aborting\n");
2608                 goto err_out_dev_close;
2609         }
2610
2611         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2612         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2613
2614         /* Setup notification timer, HW reset task, and wq locks
2615          */
2616
2617         init_timer(&enic->notify_timer);
2618         enic->notify_timer.function = enic_notify_timer;
2619         enic->notify_timer.data = (unsigned long)enic;
2620
2621         enic_set_rx_coal_setting(enic);
2622         INIT_WORK(&enic->reset, enic_reset);
2623         INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset);
2624         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2625
2626         for (i = 0; i < enic->wq_count; i++)
2627                 spin_lock_init(&enic->wq_lock[i]);
2628
2629         /* Register net device
2630          */
2631
2632         enic->port_mtu = enic->config.mtu;
2633         (void)enic_change_mtu(netdev, enic->port_mtu);
2634
2635         err = enic_set_mac_addr(netdev, enic->mac_addr);
2636         if (err) {
2637                 dev_err(dev, "Invalid MAC address, aborting\n");
2638                 goto err_out_dev_deinit;
2639         }
2640
2641         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2642         /* rx coalesce time already got initialized. This gets used
2643          * if adaptive coal is turned off
2644          */
2645         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2646
2647         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2648                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2649         else
2650                 netdev->netdev_ops = &enic_netdev_ops;
2651
2652         netdev->watchdog_timeo = 2 * HZ;
2653         enic_set_ethtool_ops(netdev);
2654
2655         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2656         if (ENIC_SETTING(enic, LOOP)) {
2657                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2658                 enic->loop_enable = 1;
2659                 enic->loop_tag = enic->config.loop_tag;
2660                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2661         }
2662         if (ENIC_SETTING(enic, TXCSUM))
2663                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2664         if (ENIC_SETTING(enic, TSO))
2665                 netdev->hw_features |= NETIF_F_TSO |
2666                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2667         if (ENIC_SETTING(enic, RSS))
2668                 netdev->hw_features |= NETIF_F_RXHASH;
2669         if (ENIC_SETTING(enic, RXCSUM))
2670                 netdev->hw_features |= NETIF_F_RXCSUM;
2671
2672         netdev->features |= netdev->hw_features;
2673
2674 #ifdef CONFIG_RFS_ACCEL
2675         netdev->hw_features |= NETIF_F_NTUPLE;
2676 #endif
2677
2678         if (using_dac)
2679                 netdev->features |= NETIF_F_HIGHDMA;
2680
2681         netdev->priv_flags |= IFF_UNICAST_FLT;
2682
2683         err = register_netdev(netdev);
2684         if (err) {
2685                 dev_err(dev, "Cannot register net device, aborting\n");
2686                 goto err_out_dev_deinit;
2687         }
2688         enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2689
2690         return 0;
2691
2692 err_out_dev_deinit:
2693         enic_dev_deinit(enic);
2694 err_out_dev_close:
2695         vnic_dev_close(enic->vdev);
2696 err_out_disable_sriov:
2697         kfree(enic->pp);
2698 err_out_disable_sriov_pp:
2699 #ifdef CONFIG_PCI_IOV
2700         if (enic_sriov_enabled(enic)) {
2701                 pci_disable_sriov(pdev);
2702                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2703         }
2704 #endif
2705 err_out_vnic_unregister:
2706         vnic_dev_unregister(enic->vdev);
2707 err_out_iounmap:
2708         enic_iounmap(enic);
2709 err_out_release_regions:
2710         pci_release_regions(pdev);
2711 err_out_disable_device:
2712         pci_disable_device(pdev);
2713 err_out_free_netdev:
2714         free_netdev(netdev);
2715
2716         return err;
2717 }
2718
2719 static void enic_remove(struct pci_dev *pdev)
2720 {
2721         struct net_device *netdev = pci_get_drvdata(pdev);
2722
2723         if (netdev) {
2724                 struct enic *enic = netdev_priv(netdev);
2725
2726                 cancel_work_sync(&enic->reset);
2727                 cancel_work_sync(&enic->change_mtu_work);
2728                 unregister_netdev(netdev);
2729                 enic_dev_deinit(enic);
2730                 vnic_dev_close(enic->vdev);
2731 #ifdef CONFIG_PCI_IOV
2732                 if (enic_sriov_enabled(enic)) {
2733                         pci_disable_sriov(pdev);
2734                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2735                 }
2736 #endif
2737                 kfree(enic->pp);
2738                 vnic_dev_unregister(enic->vdev);
2739                 enic_iounmap(enic);
2740                 pci_release_regions(pdev);
2741                 pci_disable_device(pdev);
2742                 free_netdev(netdev);
2743         }
2744 }
2745
2746 static struct pci_driver enic_driver = {
2747         .name = DRV_NAME,
2748         .id_table = enic_id_table,
2749         .probe = enic_probe,
2750         .remove = enic_remove,
2751 };
2752
2753 static int __init enic_init_module(void)
2754 {
2755         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2756
2757         return pci_register_driver(&enic_driver);
2758 }
2759
2760 static void __exit enic_cleanup_module(void)
2761 {
2762         pci_unregister_driver(&enic_driver);
2763 }
2764
2765 module_init(enic_init_module);
2766 module_exit(enic_cleanup_module);