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