drivers/scsi/cxgbi/cxgb4i/cxgb4i.c

   1 /*
   2  * cxgb4i.c: Chelsio T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by:  Karen Xie (kxie@chelsio.com)
  11  *              Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <scsi/scsi_host.h>
  19 #include <net/tcp.h>
  20 #include <net/dst.h>
  21 #include <linux/netdevice.h>
  22 #include <net/addrconf.h>
  23
  24 #include "t4_regs.h"
  25 #include "t4_msg.h"
  26 #include "cxgb4.h"
  27 #include "cxgb4_uld.h"
  28 #include "t4fw_api.h"
  29 #include "l2t.h"
  30 #include "cxgb4i.h"
  31
  32 static unsigned int dbg_level;
  33
  34 #include "../libcxgbi.h"
  35
  36 #define DRV_MODULE_NAME         "cxgb4i"
  37 #define DRV_MODULE_DESC         "Chelsio T4/T5 iSCSI Driver"
  38 #define DRV_MODULE_VERSION      "0.9.4"
  39
  40 static char version[] =
  41         DRV_MODULE_DESC " " DRV_MODULE_NAME
  42         " v" DRV_MODULE_VERSION "\n";
  43
  44 MODULE_AUTHOR("Chelsio Communications, Inc.");
  45 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  46 MODULE_VERSION(DRV_MODULE_VERSION);
  47 MODULE_LICENSE("GPL");
  48
  49 module_param(dbg_level, uint, 0644);
  50 MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
  51
  52 static int cxgb4i_rcv_win = 256 * 1024;
  53 module_param(cxgb4i_rcv_win, int, 0644);
  54 MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
  55
  56 static int cxgb4i_snd_win = 128 * 1024;
  57 module_param(cxgb4i_snd_win, int, 0644);
  58 MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
  59
  60 static int cxgb4i_rx_credit_thres = 10 * 1024;
  61 module_param(cxgb4i_rx_credit_thres, int, 0644);
  62 MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
  63                 "RX credits return threshold in bytes (default=10KB)");
  64
  65 static unsigned int cxgb4i_max_connect = (8 * 1024);
  66 module_param(cxgb4i_max_connect, uint, 0644);
  67 MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
  68
  69 static unsigned short cxgb4i_sport_base = 20000;
  70 module_param(cxgb4i_sport_base, ushort, 0644);
  71 MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
  72
  73 typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
  74
  75 static void *t4_uld_add(const struct cxgb4_lld_info *);
  76 static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
  77 static int t4_uld_state_change(void *, enum cxgb4_state state);
  78
  79 static const struct cxgb4_uld_info cxgb4i_uld_info = {
  80         .name = DRV_MODULE_NAME,
  81         .add = t4_uld_add,
  82         .rx_handler = t4_uld_rx_handler,
  83         .state_change = t4_uld_state_change,
  84 };
  85
  86 static struct scsi_host_template cxgb4i_host_template = {
  87         .module         = THIS_MODULE,
  88         .name           = DRV_MODULE_NAME,
  89         .proc_name      = DRV_MODULE_NAME,
  90         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
  91         .queuecommand   = iscsi_queuecommand,
  92         .change_queue_depth = iscsi_change_queue_depth,
  93         .sg_tablesize   = SG_ALL,
  94         .max_sectors    = 0xFFFF,
  95         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  96         .eh_abort_handler = iscsi_eh_abort,
  97         .eh_device_reset_handler = iscsi_eh_device_reset,
  98         .eh_target_reset_handler = iscsi_eh_recover_target,
  99         .target_alloc   = iscsi_target_alloc,
 100         .use_clustering = DISABLE_CLUSTERING,
 101         .this_id        = -1,
 102 };
 103
 104 static struct iscsi_transport cxgb4i_iscsi_transport = {
 105         .owner          = THIS_MODULE,
 106         .name           = DRV_MODULE_NAME,
 107         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
 108                                 CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 109                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 110         .attr_is_visible        = cxgbi_attr_is_visible,
 111         .get_host_param = cxgbi_get_host_param,
 112         .set_host_param = cxgbi_set_host_param,
 113         /* session management */
 114         .create_session = cxgbi_create_session,
 115         .destroy_session        = cxgbi_destroy_session,
 116         .get_session_param = iscsi_session_get_param,
 117         /* connection management */
 118         .create_conn    = cxgbi_create_conn,
 119         .bind_conn              = cxgbi_bind_conn,
 120         .destroy_conn   = iscsi_tcp_conn_teardown,
 121         .start_conn             = iscsi_conn_start,
 122         .stop_conn              = iscsi_conn_stop,
 123         .get_conn_param = iscsi_conn_get_param,
 124         .set_param      = cxgbi_set_conn_param,
 125         .get_stats      = cxgbi_get_conn_stats,
 126         /* pdu xmit req from user space */
 127         .send_pdu       = iscsi_conn_send_pdu,
 128         /* task */
 129         .init_task      = iscsi_tcp_task_init,
 130         .xmit_task      = iscsi_tcp_task_xmit,
 131         .cleanup_task   = cxgbi_cleanup_task,
 132         /* pdu */
 133         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 134         .init_pdu       = cxgbi_conn_init_pdu,
 135         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 136         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 137         /* TCP connect/disconnect */
 138         .get_ep_param   = cxgbi_get_ep_param,
 139         .ep_connect     = cxgbi_ep_connect,
 140         .ep_poll        = cxgbi_ep_poll,
 141         .ep_disconnect  = cxgbi_ep_disconnect,
 142         /* Error recovery timeout call */
 143         .session_recovery_timedout = iscsi_session_recovery_timedout,
 144 };
 145
 146 static struct scsi_transport_template *cxgb4i_stt;
 147
 148 /*
 149  * CPL (Chelsio Protocol Language) defines a message passing interface between
 150  * the host driver and Chelsio asic.
 151  * The section below implments CPLs that related to iscsi tcp connection
 152  * open/close/abort and data send/receive.
 153  */
 154
 155 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
 156 #define RCV_BUFSIZ_MASK         0x3FFU
 157 #define MAX_IMM_TX_PKT_LEN      128
 158
 159 static inline void set_queue(struct sk_buff *skb, unsigned int queue,
 160                                 const struct cxgbi_sock *csk)
 161 {
 162         skb->queue_mapping = queue;
 163 }
 164
 165 static int push_tx_frames(struct cxgbi_sock *, int);
 166
 167 /*
 168  * is_ofld_imm - check whether a packet can be sent as immediate data
 169  * @skb: the packet
 170  *
 171  * Returns true if a packet can be sent as an offload WR with immediate
 172  * data.  We currently use the same limit as for Ethernet packets.
 173  */
 174 static inline int is_ofld_imm(const struct sk_buff *skb)
 175 {
 176         return skb->len <= (MAX_IMM_TX_PKT_LEN -
 177                         sizeof(struct fw_ofld_tx_data_wr));
 178 }
 179
 180 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 181                                 struct l2t_entry *e)
 182 {
 183         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 184         int t4 = is_t4(lldi->adapter_type);
 185         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
 186         unsigned long long opt0;
 187         unsigned int opt2;
 188         unsigned int qid_atid = ((unsigned int)csk->atid) |
 189                                  (((unsigned int)csk->rss_qid) << 14);
 190
 191         opt0 = KEEP_ALIVE(1) |
 192                 WND_SCALE(wscale) |
 193                 MSS_IDX(csk->mss_idx) |
 194                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
 195                 TX_CHAN(csk->tx_chan) |
 196                 SMAC_SEL(csk->smac_idx) |
 197                 ULP_MODE(ULP_MODE_ISCSI) |
 198                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
 199         opt2 = RX_CHANNEL(0) |
 200                 RSS_QUEUE_VALID |
 201                 (1 << 20) |
 202                 RSS_QUEUE(csk->rss_qid);
 203
 204         if (is_t4(lldi->adapter_type)) {
 205                 struct cpl_act_open_req *req =
 206                                 (struct cpl_act_open_req *)skb->head;
 207
 208                 INIT_TP_WR(req, 0);
 209                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
 210                                         qid_atid));
 211                 req->local_port = csk->saddr.sin_port;
 212                 req->peer_port = csk->daddr.sin_port;
 213                 req->local_ip = csk->saddr.sin_addr.s_addr;
 214                 req->peer_ip = csk->daddr.sin_addr.s_addr;
 215                 req->opt0 = cpu_to_be64(opt0);
 216                 req->params = cpu_to_be32(cxgb4_select_ntuple(
 217                                         csk->cdev->ports[csk->port_id],
 218                                         csk->l2t));
 219                 opt2 |= 1 << 22;
 220                 req->opt2 = cpu_to_be32(opt2);
 221
 222                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 223                         "csk t4 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
 224                         csk, &req->local_ip, ntohs(req->local_port),
 225                         &req->peer_ip, ntohs(req->peer_port),
 226                         csk->atid, csk->rss_qid);
 227         } else {
 228                 struct cpl_t5_act_open_req *req =
 229                                 (struct cpl_t5_act_open_req *)skb->head;
 230
 231                 INIT_TP_WR(req, 0);
 232                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
 233                                         qid_atid));
 234                 req->local_port = csk->saddr.sin_port;
 235                 req->peer_port = csk->daddr.sin_port;
 236                 req->local_ip = csk->saddr.sin_addr.s_addr;
 237                 req->peer_ip = csk->daddr.sin_addr.s_addr;
 238                 req->opt0 = cpu_to_be64(opt0);
 239                 req->params = cpu_to_be64(V_FILTER_TUPLE(
 240                                 cxgb4_select_ntuple(
 241                                         csk->cdev->ports[csk->port_id],
 242                                         csk->l2t)));
 243                 opt2 |= 1 << 31;
 244                 req->opt2 = cpu_to_be32(opt2);
 245
 246                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 247                         "csk t5 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
 248                         csk, &req->local_ip, ntohs(req->local_port),
 249                         &req->peer_ip, ntohs(req->peer_port),
 250                         csk->atid, csk->rss_qid);
 251         }
 252
 253         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
 254
 255         pr_info_ipaddr("t%d csk 0x%p,%u,0x%lx,%u, rss_qid %u.\n",
 256                        (&csk->saddr), (&csk->daddr), t4 ? 4 : 5, csk,
 257                        csk->state, csk->flags, csk->atid, csk->rss_qid);
 258
 259         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 260 }
 261
 262 static void send_act_open_req6(struct cxgbi_sock *csk, struct sk_buff *skb,
 263                                struct l2t_entry *e)
 264 {
 265         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 266         int t4 = is_t4(lldi->adapter_type);
 267         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
 268         unsigned long long opt0;
 269         unsigned int opt2;
 270         unsigned int qid_atid = ((unsigned int)csk->atid) |
 271                                  (((unsigned int)csk->rss_qid) << 14);
 272
 273         opt0 = KEEP_ALIVE(1) |
 274                 WND_SCALE(wscale) |
 275                 MSS_IDX(csk->mss_idx) |
 276                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
 277                 TX_CHAN(csk->tx_chan) |
 278                 SMAC_SEL(csk->smac_idx) |
 279                 ULP_MODE(ULP_MODE_ISCSI) |
 280                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
 281
 282         opt2 = RX_CHANNEL(0) |
 283                 RSS_QUEUE_VALID |
 284                 RX_FC_DISABLE |
 285                 RSS_QUEUE(csk->rss_qid);
 286
 287         if (t4) {
 288                 struct cpl_act_open_req6 *req =
 289                             (struct cpl_act_open_req6 *)skb->head;
 290
 291                 INIT_TP_WR(req, 0);
 292                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
 293                                                             qid_atid));
 294                 req->local_port = csk->saddr6.sin6_port;
 295                 req->peer_port = csk->daddr6.sin6_port;
 296
 297                 req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
 298                 req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
 299                                                                     8);
 300                 req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
 301                 req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
 302                                                                     8);
 303
 304                 req->opt0 = cpu_to_be64(opt0);
 305
 306                 opt2 |= RX_FC_VALID;
 307                 req->opt2 = cpu_to_be32(opt2);
 308
 309                 req->params = cpu_to_be32(cxgb4_select_ntuple(
 310                                           csk->cdev->ports[csk->port_id],
 311                                           csk->l2t));
 312         } else {
 313                 struct cpl_t5_act_open_req6 *req =
 314                                 (struct cpl_t5_act_open_req6 *)skb->head;
 315
 316                 INIT_TP_WR(req, 0);
 317                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
 318                                                             qid_atid));
 319                 req->local_port = csk->saddr6.sin6_port;
 320                 req->peer_port = csk->daddr6.sin6_port;
 321                 req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
 322                 req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
 323                                                                         8);
 324                 req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
 325                 req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
 326                                                                         8);
 327                 req->opt0 = cpu_to_be64(opt0);
 328
 329                 opt2 |= T5_OPT_2_VALID;
 330                 req->opt2 = cpu_to_be32(opt2);
 331
 332                 req->params = cpu_to_be64(V_FILTER_TUPLE(cxgb4_select_ntuple(
 333                                           csk->cdev->ports[csk->port_id],
 334                                           csk->l2t)));
 335         }
 336
 337         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
 338
 339         pr_info("t%d csk 0x%p,%u,0x%lx,%u, [%pI6]:%u-[%pI6]:%u, rss_qid %u.\n",
 340                 t4 ? 4 : 5, csk, csk->state, csk->flags, csk->atid,
 341                 &csk->saddr6.sin6_addr, ntohs(csk->saddr.sin_port),
 342                 &csk->daddr6.sin6_addr, ntohs(csk->daddr.sin_port),
 343                 csk->rss_qid);
 344
 345         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 346 }
 347
 348 static void send_close_req(struct cxgbi_sock *csk)
 349 {
 350         struct sk_buff *skb = csk->cpl_close;
 351         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 352         unsigned int tid = csk->tid;
 353
 354         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 355                 "csk 0x%p,%u,0x%lx, tid %u.\n",
 356                 csk, csk->state, csk->flags, csk->tid);
 357         csk->cpl_close = NULL;
 358         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 359         INIT_TP_WR(req, tid);
 360         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 361         req->rsvd = 0;
 362
 363         cxgbi_sock_skb_entail(csk, skb);
 364         if (csk->state >= CTP_ESTABLISHED)
 365                 push_tx_frames(csk, 1);
 366 }
 367
 368 static void abort_arp_failure(void *handle, struct sk_buff *skb)
 369 {
 370         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
 371         struct cpl_abort_req *req;
 372
 373         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 374                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
 375                 csk, csk->state, csk->flags, csk->tid);
 376         req = (struct cpl_abort_req *)skb->data;
 377         req->cmd = CPL_ABORT_NO_RST;
 378         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 379 }
 380
 381 static void send_abort_req(struct cxgbi_sock *csk)
 382 {
 383         struct cpl_abort_req *req;
 384         struct sk_buff *skb = csk->cpl_abort_req;
 385
 386         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
 387                 return;
 388         cxgbi_sock_set_state(csk, CTP_ABORTING);
 389         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 390         cxgbi_sock_purge_write_queue(csk);
 391
 392         csk->cpl_abort_req = NULL;
 393         req = (struct cpl_abort_req *)skb->head;
 394         set_queue(skb, CPL_PRIORITY_DATA, csk);
 395         req->cmd = CPL_ABORT_SEND_RST;
 396         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
 397         INIT_TP_WR(req, csk->tid);
 398         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 399         req->rsvd0 = htonl(csk->snd_nxt);
 400         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 401
 402         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 403                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 404                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 405                 req->rsvd1);
 406
 407         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 408 }
 409
 410 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 411 {
 412         struct sk_buff *skb = csk->cpl_abort_rpl;
 413         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 414
 415         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 416                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 417                 csk, csk->state, csk->flags, csk->tid, rst_status);
 418
 419         csk->cpl_abort_rpl = NULL;
 420         set_queue(skb, CPL_PRIORITY_DATA, csk);
 421         INIT_TP_WR(rpl, csk->tid);
 422         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 423         rpl->cmd = rst_status;
 424         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 425 }
 426
 427 /*
 428  * CPL connection rx data ack: host ->
 429  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 430  * credits sent.
 431  */
 432 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 433 {
 434         struct sk_buff *skb;
 435         struct cpl_rx_data_ack *req;
 436
 437         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 438                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
 439                 csk, csk->state, csk->flags, csk->tid, credits);
 440
 441         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 442         if (!skb) {
 443                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 444                 return 0;
 445         }
 446         req = (struct cpl_rx_data_ack *)skb->head;
 447
 448         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
 449         INIT_TP_WR(req, csk->tid);
 450         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
 451                                       csk->tid));
 452         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
 453         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 454         return credits;
 455 }
 456
 457 /*
 458  * sgl_len - calculates the size of an SGL of the given capacity
 459  * @n: the number of SGL entries
 460  * Calculates the number of flits needed for a scatter/gather list that
 461  * can hold the given number of entries.
 462  */
 463 static inline unsigned int sgl_len(unsigned int n)
 464 {
 465         n--;
 466         return (3 * n) / 2 + (n & 1) + 2;
 467 }
 468
 469 /*
 470  * calc_tx_flits_ofld - calculate # of flits for an offload packet
 471  * @skb: the packet
 472  *
 473  * Returns the number of flits needed for the given offload packet.
 474  * These packets are already fully constructed and no additional headers
 475  * will be added.
 476  */
 477 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
 478 {
 479         unsigned int flits, cnt;
 480
 481         if (is_ofld_imm(skb))
 482                 return DIV_ROUND_UP(skb->len, 8);
 483         flits = skb_transport_offset(skb) / 8;
 484         cnt = skb_shinfo(skb)->nr_frags;
 485         if (skb_tail_pointer(skb) != skb_transport_header(skb))
 486                 cnt++;
 487         return flits + sgl_len(cnt);
 488 }
 489
 490 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
 491 {
 492         struct sk_buff *skb;
 493         struct fw_flowc_wr *flowc;
 494         int flowclen, i;
 495
 496         flowclen = 80;
 497         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
 498         flowc = (struct fw_flowc_wr *)skb->head;
 499         flowc->op_to_nparams =
 500                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
 501         flowc->flowid_len16 =
 502                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
 503                                 FW_WR_FLOWID(csk->tid));
 504         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
 505         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
 506         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
 507         flowc->mnemval[1].val = htonl(csk->tx_chan);
 508         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
 509         flowc->mnemval[2].val = htonl(csk->tx_chan);
 510         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
 511         flowc->mnemval[3].val = htonl(csk->rss_qid);
 512         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
 513         flowc->mnemval[4].val = htonl(csk->snd_nxt);
 514         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
 515         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
 516         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
 517         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
 518         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
 519         flowc->mnemval[7].val = htonl(csk->advmss);
 520         flowc->mnemval[8].mnemonic = 0;
 521         flowc->mnemval[8].val = 0;
 522         for (i = 0; i < 9; i++) {
 523                 flowc->mnemval[i].r4[0] = 0;
 524                 flowc->mnemval[i].r4[1] = 0;
 525                 flowc->mnemval[i].r4[2] = 0;
 526         }
 527         set_queue(skb, CPL_PRIORITY_DATA, csk);
 528
 529         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 530                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
 531                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
 532                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
 533                 csk->advmss);
 534
 535         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 536 }
 537
 538 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 539                                    int dlen, int len, u32 credits, int compl)
 540 {
 541         struct fw_ofld_tx_data_wr *req;
 542         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
 543         unsigned int wr_ulp_mode = 0;
 544
 545         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 546
 547         if (is_ofld_imm(skb)) {
 548                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 549                                         FW_WR_COMPL(1) |
 550                                         FW_WR_IMMDLEN(dlen));
 551                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
 552                                                 FW_WR_LEN16(credits));
 553         } else {
 554                 req->op_to_immdlen =
 555                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 556                                         FW_WR_COMPL(1) |
 557                                         FW_WR_IMMDLEN(0));
 558                 req->flowid_len16 =
 559                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
 560                                         FW_WR_LEN16(credits));
 561         }
 562         if (submode)
 563                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
 564                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
 565         req->tunnel_to_proxy = htonl(wr_ulp_mode |
 566                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1));
 567         req->plen = htonl(len);
 568         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
 569                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 570 }
 571
 572 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 573 {
 574         kfree_skb(skb);
 575 }
 576
 577 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 578 {
 579         int total_size = 0;
 580         struct sk_buff *skb;
 581
 582         if (unlikely(csk->state < CTP_ESTABLISHED ||
 583                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 584                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
 585                          1 << CXGBI_DBG_PDU_TX,
 586                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 587                         csk, csk->state, csk->flags, csk->tid);
 588                 return 0;
 589         }
 590
 591         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 592                 int dlen = skb->len;
 593                 int len = skb->len;
 594                 unsigned int credits_needed;
 595
 596                 skb_reset_transport_header(skb);
 597                 if (is_ofld_imm(skb))
 598                         credits_needed = DIV_ROUND_UP(dlen +
 599                                         sizeof(struct fw_ofld_tx_data_wr), 16);
 600                 else
 601                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
 602                                         + sizeof(struct fw_ofld_tx_data_wr),
 603                                         16);
 604
 605                 if (csk->wr_cred < credits_needed) {
 606                         log_debug(1 << CXGBI_DBG_PDU_TX,
 607                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
 608                                 csk, skb->len, skb->data_len,
 609                                 credits_needed, csk->wr_cred);
 610                         break;
 611                 }
 612                 __skb_unlink(skb, &csk->write_queue);
 613                 set_queue(skb, CPL_PRIORITY_DATA, csk);
 614                 skb->csum = credits_needed;
 615                 csk->wr_cred -= credits_needed;
 616                 csk->wr_una_cred += credits_needed;
 617                 cxgbi_sock_enqueue_wr(csk, skb);
 618
 619                 log_debug(1 << CXGBI_DBG_PDU_TX,
 620                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 621                         csk, skb->len, skb->data_len, credits_needed,
 622                         csk->wr_cred, csk->wr_una_cred);
 623
 624                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 625                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 626                                 send_tx_flowc_wr(csk);
 627                                 skb->csum += 5;
 628                                 csk->wr_cred -= 5;
 629                                 csk->wr_una_cred += 5;
 630                         }
 631                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 632                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
 633                                         req_completion);
 634                         csk->snd_nxt += len;
 635                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 636                 }
 637                 total_size += skb->truesize;
 638                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
 639
 640                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 641                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
 642                         csk, csk->state, csk->flags, csk->tid, skb, len);
 643
 644                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 645         }
 646         return total_size;
 647 }
 648
 649 static inline void free_atid(struct cxgbi_sock *csk)
 650 {
 651         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 652
 653         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 654                 cxgb4_free_atid(lldi->tids, csk->atid);
 655                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 656                 cxgbi_sock_put(csk);
 657         }
 658 }
 659
 660 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
 661 {
 662         struct cxgbi_sock *csk;
 663         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
 664         unsigned short tcp_opt = ntohs(req->tcp_opt);
 665         unsigned int tid = GET_TID(req);
 666         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
 667         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 668         struct tid_info *t = lldi->tids;
 669         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
 670
 671         csk = lookup_atid(t, atid);
 672         if (unlikely(!csk)) {
 673                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
 674                 goto rel_skb;
 675         }
 676
 677         if (csk->atid != atid) {
 678                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
 679                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
 680                 goto rel_skb;
 681         }
 682
 683         pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 684                        (&csk->saddr), (&csk->daddr),
 685                        atid, tid, csk, csk->state, csk->flags, rcv_isn);
 686
 687         module_put(THIS_MODULE);
 688
 689         cxgbi_sock_get(csk);
 690         csk->tid = tid;
 691         cxgb4_insert_tid(lldi->tids, csk, tid);
 692         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 693
 694         free_atid(csk);
 695
 696         spin_lock_bh(&csk->lock);
 697         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 698                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 699                         csk, csk->state, csk->flags, csk->tid);
 700
 701         if (csk->retry_timer.function) {
 702                 del_timer(&csk->retry_timer);
 703                 csk->retry_timer.function = NULL;
 704         }
 705
 706         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 707         /*
 708          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
 709          * pass through opt0.
 710          */
 711         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
 712                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
 713
 714         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
 715         if (GET_TCPOPT_TSTAMP(tcp_opt))
 716                 csk->advmss -= 12;
 717         if (csk->advmss < 128)
 718                 csk->advmss = 128;
 719
 720         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 721                 "csk 0x%p, mss_idx %u, advmss %u.\n",
 722                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
 723
 724         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 725
 726         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 727                 send_abort_req(csk);
 728         else {
 729                 if (skb_queue_len(&csk->write_queue))
 730                         push_tx_frames(csk, 0);
 731                 cxgbi_conn_tx_open(csk);
 732         }
 733         spin_unlock_bh(&csk->lock);
 734
 735 rel_skb:
 736         __kfree_skb(skb);
 737 }
 738
 739 static int act_open_rpl_status_to_errno(int status)
 740 {
 741         switch (status) {
 742         case CPL_ERR_CONN_RESET:
 743                 return -ECONNREFUSED;
 744         case CPL_ERR_ARP_MISS:
 745                 return -EHOSTUNREACH;
 746         case CPL_ERR_CONN_TIMEDOUT:
 747                 return -ETIMEDOUT;
 748         case CPL_ERR_TCAM_FULL:
 749                 return -ENOMEM;
 750         case CPL_ERR_CONN_EXIST:
 751                 return -EADDRINUSE;
 752         default:
 753                 return -EIO;
 754         }
 755 }
 756
 757 static void csk_act_open_retry_timer(unsigned long data)
 758 {
 759         struct sk_buff *skb;
 760         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 761         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 762         void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
 763                                    struct l2t_entry *);
 764         int t4 = is_t4(lldi->adapter_type), size, size6;
 765
 766         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 767                 "csk 0x%p,%u,0x%lx,%u.\n",
 768                 csk, csk->state, csk->flags, csk->tid);
 769
 770         cxgbi_sock_get(csk);
 771         spin_lock_bh(&csk->lock);
 772
 773         if (t4) {
 774                 size = sizeof(struct cpl_act_open_req);
 775                 size6 = sizeof(struct cpl_act_open_req6);
 776         } else {
 777                 size = sizeof(struct cpl_t5_act_open_req);
 778                 size6 = sizeof(struct cpl_t5_act_open_req6);
 779         }
 780
 781         if (csk->csk_family == AF_INET) {
 782                 send_act_open_func = send_act_open_req;
 783                 skb = alloc_wr(size, 0, GFP_ATOMIC);
 784         } else {
 785                 send_act_open_func = send_act_open_req6;
 786                 skb = alloc_wr(size6, 0, GFP_ATOMIC);
 787         }
 788
 789         if (!skb)
 790                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 791         else {
 792                 skb->sk = (struct sock *)csk;
 793                 t4_set_arp_err_handler(skb, csk,
 794                                        cxgbi_sock_act_open_req_arp_failure);
 795                 send_act_open_func(csk, skb, csk->l2t);
 796         }
 797
 798         spin_unlock_bh(&csk->lock);
 799         cxgbi_sock_put(csk);
 800
 801 }
 802
 803 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 804 {
 805         struct cxgbi_sock *csk;
 806         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
 807         unsigned int tid = GET_TID(rpl);
 808         unsigned int atid =
 809                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
 810         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
 811         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 812         struct tid_info *t = lldi->tids;
 813
 814         csk = lookup_atid(t, atid);
 815         if (unlikely(!csk)) {
 816                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
 817                 goto rel_skb;
 818         }
 819
 820         pr_info_ipaddr("tid %u/%u, status %u.\n"
 821                        "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
 822                        atid, tid, status, csk, csk->state, csk->flags);
 823
 824         if (status == CPL_ERR_RTX_NEG_ADVICE)
 825                 goto rel_skb;
 826
 827         if (status && status != CPL_ERR_TCAM_FULL &&
 828             status != CPL_ERR_CONN_EXIST &&
 829             status != CPL_ERR_ARP_MISS)
 830                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 831
 832         cxgbi_sock_get(csk);
 833         spin_lock_bh(&csk->lock);
 834
 835         if (status == CPL_ERR_CONN_EXIST &&
 836             csk->retry_timer.function != csk_act_open_retry_timer) {
 837                 csk->retry_timer.function = csk_act_open_retry_timer;
 838                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 839         } else
 840                 cxgbi_sock_fail_act_open(csk,
 841                                         act_open_rpl_status_to_errno(status));
 842
 843         spin_unlock_bh(&csk->lock);
 844         cxgbi_sock_put(csk);
 845 rel_skb:
 846         __kfree_skb(skb);
 847 }
 848
 849 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 850 {
 851         struct cxgbi_sock *csk;
 852         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 853         unsigned int tid = GET_TID(req);
 854         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 855         struct tid_info *t = lldi->tids;
 856
 857         csk = lookup_tid(t, tid);
 858         if (unlikely(!csk)) {
 859                 pr_err("can't find connection for tid %u.\n", tid);
 860                 goto rel_skb;
 861         }
 862         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 863                        (&csk->saddr), (&csk->daddr),
 864                        csk, csk->state, csk->flags, csk->tid);
 865         cxgbi_sock_rcv_peer_close(csk);
 866 rel_skb:
 867         __kfree_skb(skb);
 868 }
 869
 870 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 871 {
 872         struct cxgbi_sock *csk;
 873         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 874         unsigned int tid = GET_TID(rpl);
 875         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 876         struct tid_info *t = lldi->tids;
 877
 878         csk = lookup_tid(t, tid);
 879         if (unlikely(!csk)) {
 880                 pr_err("can't find connection for tid %u.\n", tid);
 881                 goto rel_skb;
 882         }
 883         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 884                        (&csk->saddr), (&csk->daddr),
 885                        csk, csk->state, csk->flags, csk->tid);
 886         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 887 rel_skb:
 888         __kfree_skb(skb);
 889 }
 890
 891 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 892                                                                 int *need_rst)
 893 {
 894         switch (abort_reason) {
 895         case CPL_ERR_BAD_SYN: /* fall through */
 896         case CPL_ERR_CONN_RESET:
 897                 return csk->state > CTP_ESTABLISHED ?
 898                         -EPIPE : -ECONNRESET;
 899         case CPL_ERR_XMIT_TIMEDOUT:
 900         case CPL_ERR_PERSIST_TIMEDOUT:
 901         case CPL_ERR_FINWAIT2_TIMEDOUT:
 902         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 903                 return -ETIMEDOUT;
 904         default:
 905                 return -EIO;
 906         }
 907 }
 908
 909 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 910 {
 911         struct cxgbi_sock *csk;
 912         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 913         unsigned int tid = GET_TID(req);
 914         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 915         struct tid_info *t = lldi->tids;
 916         int rst_status = CPL_ABORT_NO_RST;
 917
 918         csk = lookup_tid(t, tid);
 919         if (unlikely(!csk)) {
 920                 pr_err("can't find connection for tid %u.\n", tid);
 921                 goto rel_skb;
 922         }
 923
 924         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 925                        (&csk->saddr), (&csk->daddr),
 926                        csk, csk->state, csk->flags, csk->tid, req->status);
 927
 928         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 929             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 930                 goto rel_skb;
 931
 932         cxgbi_sock_get(csk);
 933         spin_lock_bh(&csk->lock);
 934
 935         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 936                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 937                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 938                 goto done;
 939         }
 940
 941         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 942         send_abort_rpl(csk, rst_status);
 943
 944         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 945                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 946                 cxgbi_sock_closed(csk);
 947         }
 948 done:
 949         spin_unlock_bh(&csk->lock);
 950         cxgbi_sock_put(csk);
 951 rel_skb:
 952         __kfree_skb(skb);
 953 }
 954
 955 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 956 {
 957         struct cxgbi_sock *csk;
 958         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 959         unsigned int tid = GET_TID(rpl);
 960         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 961         struct tid_info *t = lldi->tids;
 962
 963         csk = lookup_tid(t, tid);
 964         if (!csk)
 965                 goto rel_skb;
 966
 967         if (csk)
 968                 pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 969                                (&csk->saddr), (&csk->daddr), csk,
 970                                csk->state, csk->flags, csk->tid, rpl->status);
 971
 972         if (rpl->status == CPL_ERR_ABORT_FAILED)
 973                 goto rel_skb;
 974
 975         cxgbi_sock_rcv_abort_rpl(csk);
 976 rel_skb:
 977         __kfree_skb(skb);
 978 }
 979
 980 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 981 {
 982         struct cxgbi_sock *csk;
 983         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 984         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 985         unsigned int tid = GET_TID(cpl);
 986         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 987         struct tid_info *t = lldi->tids;
 988
 989         csk = lookup_tid(t, tid);
 990         if (unlikely(!csk)) {
 991                 pr_err("can't find conn. for tid %u.\n", tid);
 992                 goto rel_skb;
 993         }
 994
 995         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 996                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
 997                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
 998                 pdu_len_ddp);
 999
1000         spin_lock_bh(&csk->lock);
1001
1002         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1003                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1004                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1005                         csk, csk->state, csk->flags, csk->tid);
1006                 if (csk->state != CTP_ABORTING)
1007                         goto abort_conn;
1008                 else
1009                         goto discard;
1010         }
1011
1012         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
1013         cxgbi_skcb_flags(skb) = 0;
1014
1015         skb_reset_transport_header(skb);
1016         __skb_pull(skb, sizeof(*cpl));
1017         __pskb_trim(skb, ntohs(cpl->len));
1018
1019         if (!csk->skb_ulp_lhdr) {
1020                 unsigned char *bhs;
1021                 unsigned int hlen, dlen, plen;
1022
1023                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1024                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
1025                         csk, csk->state, csk->flags, csk->tid, skb);
1026                 csk->skb_ulp_lhdr = skb;
1027                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
1028
1029                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
1030                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
1031                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
1032                                 csk->rcv_nxt);
1033                         goto abort_conn;
1034                 }
1035
1036                 bhs = skb->data;
1037                 hlen = ntohs(cpl->len);
1038                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
1039
1040                 plen = ISCSI_PDU_LEN(pdu_len_ddp);
1041                 if (is_t4(lldi->adapter_type))
1042                         plen -= 40;
1043
1044                 if ((hlen + dlen) != plen) {
1045                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
1046                                 "mismatch %u != %u + %u, seq 0x%x.\n",
1047                                 csk->tid, plen, hlen, dlen,
1048                                 cxgbi_skcb_tcp_seq(skb));
1049                         goto abort_conn;
1050                 }
1051
1052                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
1053                 if (dlen)
1054                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
1055                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
1056
1057                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1058                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
1059                         csk, skb, *bhs, hlen, dlen,
1060                         ntohl(*((unsigned int *)(bhs + 16))),
1061                         ntohl(*((unsigned int *)(bhs + 24))));
1062
1063         } else {
1064                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
1065
1066                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
1067                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1068                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1069                         csk, csk->state, csk->flags, skb, lskb);
1070         }
1071
1072         __skb_queue_tail(&csk->receive_queue, skb);
1073         spin_unlock_bh(&csk->lock);
1074         return;
1075
1076 abort_conn:
1077         send_abort_req(csk);
1078 discard:
1079         spin_unlock_bh(&csk->lock);
1080 rel_skb:
1081         __kfree_skb(skb);
1082 }
1083
1084 static void do_rx_data_ddp(struct cxgbi_device *cdev,
1085                                   struct sk_buff *skb)
1086 {
1087         struct cxgbi_sock *csk;
1088         struct sk_buff *lskb;
1089         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
1090         unsigned int tid = GET_TID(rpl);
1091         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1092         struct tid_info *t = lldi->tids;
1093         unsigned int status = ntohl(rpl->ddpvld);
1094
1095         csk = lookup_tid(t, tid);
1096         if (unlikely(!csk)) {
1097                 pr_err("can't find connection for tid %u.\n", tid);
1098                 goto rel_skb;
1099         }
1100
1101         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1102                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
1103                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
1104
1105         spin_lock_bh(&csk->lock);
1106
1107         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1108                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1109                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1110                         csk, csk->state, csk->flags, csk->tid);
1111                 if (csk->state != CTP_ABORTING)
1112                         goto abort_conn;
1113                 else
1114                         goto discard;
1115         }
1116
1117         if (!csk->skb_ulp_lhdr) {
1118                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
1119                 goto abort_conn;
1120         }
1121
1122         lskb = csk->skb_ulp_lhdr;
1123         csk->skb_ulp_lhdr = NULL;
1124
1125         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
1126
1127         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
1128                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
1129                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
1130
1131         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
1132                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1133                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1134                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
1135         }
1136         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1137                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1138                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1139                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1140         }
1141         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1142                 log_debug(1 << CXGBI_DBG_PDU_RX,
1143                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1144                         csk, lskb, status);
1145                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1146         }
1147         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1148                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1149                 log_debug(1 << CXGBI_DBG_PDU_RX,
1150                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1151                         csk, lskb, status);
1152                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1153         }
1154         log_debug(1 << CXGBI_DBG_PDU_RX,
1155                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1156                 csk, lskb, cxgbi_skcb_flags(lskb));
1157
1158         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1159         cxgbi_conn_pdu_ready(csk);
1160         spin_unlock_bh(&csk->lock);
1161         goto rel_skb;
1162
1163 abort_conn:
1164         send_abort_req(csk);
1165 discard:
1166         spin_unlock_bh(&csk->lock);
1167 rel_skb:
1168         __kfree_skb(skb);
1169 }
1170
1171 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1172 {
1173         struct cxgbi_sock *csk;
1174         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1175         unsigned int tid = GET_TID(rpl);
1176         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1177         struct tid_info *t = lldi->tids;
1178
1179         csk = lookup_tid(t, tid);
1180         if (unlikely(!csk))
1181                 pr_err("can't find connection for tid %u.\n", tid);
1182         else {
1183                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1184                         "csk 0x%p,%u,0x%lx,%u.\n",
1185                         csk, csk->state, csk->flags, csk->tid);
1186                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1187                                         rpl->seq_vld);
1188         }
1189         __kfree_skb(skb);
1190 }
1191
1192 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1193 {
1194         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1195         unsigned int tid = GET_TID(rpl);
1196         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1197         struct tid_info *t = lldi->tids;
1198         struct cxgbi_sock *csk;
1199
1200         csk = lookup_tid(t, tid);
1201         if (!csk)
1202                 pr_err("can't find conn. for tid %u.\n", tid);
1203
1204         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1205                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1206                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1207
1208         if (rpl->status != CPL_ERR_NONE)
1209                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1210                         csk, tid, rpl->status);
1211
1212         __kfree_skb(skb);
1213 }
1214
1215 static int alloc_cpls(struct cxgbi_sock *csk)
1216 {
1217         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1218                                         0, GFP_KERNEL);
1219         if (!csk->cpl_close)
1220                 return -ENOMEM;
1221
1222         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1223                                         0, GFP_KERNEL);
1224         if (!csk->cpl_abort_req)
1225                 goto free_cpls;
1226
1227         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1228                                         0, GFP_KERNEL);
1229         if (!csk->cpl_abort_rpl)
1230                 goto free_cpls;
1231         return 0;
1232
1233 free_cpls:
1234         cxgbi_sock_free_cpl_skbs(csk);
1235         return -ENOMEM;
1236 }
1237
1238 static inline void l2t_put(struct cxgbi_sock *csk)
1239 {
1240         if (csk->l2t) {
1241                 cxgb4_l2t_release(csk->l2t);
1242                 csk->l2t = NULL;
1243                 cxgbi_sock_put(csk);
1244         }
1245 }
1246
1247 static void release_offload_resources(struct cxgbi_sock *csk)
1248 {
1249         struct cxgb4_lld_info *lldi;
1250
1251         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1252                 "csk 0x%p,%u,0x%lx,%u.\n",
1253                 csk, csk->state, csk->flags, csk->tid);
1254
1255         cxgbi_sock_free_cpl_skbs(csk);
1256         if (csk->wr_cred != csk->wr_max_cred) {
1257                 cxgbi_sock_purge_wr_queue(csk);
1258                 cxgbi_sock_reset_wr_list(csk);
1259         }
1260
1261         l2t_put(csk);
1262         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1263                 free_atid(csk);
1264         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1265                 lldi = cxgbi_cdev_priv(csk->cdev);
1266                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1267                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1268                 cxgbi_sock_put(csk);
1269         }
1270         csk->dst = NULL;
1271         csk->cdev = NULL;
1272 }
1273
1274 static int init_act_open(struct cxgbi_sock *csk)
1275 {
1276         struct cxgbi_device *cdev = csk->cdev;
1277         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1278         struct net_device *ndev = cdev->ports[csk->port_id];
1279         struct sk_buff *skb = NULL;
1280         struct neighbour *n = NULL;
1281         void *daddr;
1282         unsigned int step;
1283         unsigned int size, size6;
1284         int t4 = is_t4(lldi->adapter_type);
1285
1286         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1287                 "csk 0x%p,%u,0x%lx,%u.\n",
1288                 csk, csk->state, csk->flags, csk->tid);
1289
1290         if (csk->csk_family == AF_INET)
1291                 daddr = &csk->daddr.sin_addr.s_addr;
1292 #if IS_ENABLED(CONFIG_IPV6)
1293         else if (csk->csk_family == AF_INET6)
1294                 daddr = &csk->daddr6.sin6_addr;
1295 #endif
1296         else {
1297                 pr_err("address family 0x%x not supported\n", csk->csk_family);
1298                 goto rel_resource;
1299         }
1300
1301         n = dst_neigh_lookup(csk->dst, daddr);
1302
1303         if (!n) {
1304                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1305                 goto rel_resource;
1306         }
1307
1308         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1309         if (csk->atid < 0) {
1310                 pr_err("%s, NO atid available.\n", ndev->name);
1311                 return -EINVAL;
1312         }
1313         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1314         cxgbi_sock_get(csk);
1315
1316         n = dst_neigh_lookup(csk->dst, &csk->daddr.sin_addr.s_addr);
1317         if (!n) {
1318                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1319                 goto rel_resource;
1320         }
1321         csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1322         if (!csk->l2t) {
1323                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1324                 goto rel_resource;
1325         }
1326         cxgbi_sock_get(csk);
1327
1328         if (t4) {
1329                 size = sizeof(struct cpl_act_open_req);
1330                 size6 = sizeof(struct cpl_act_open_req6);
1331         } else {
1332                 size = sizeof(struct cpl_t5_act_open_req);
1333                 size6 = sizeof(struct cpl_t5_act_open_req6);
1334         }
1335
1336         if (csk->csk_family == AF_INET)
1337                 skb = alloc_wr(size, 0, GFP_NOIO);
1338         else
1339                 skb = alloc_wr(size6, 0, GFP_NOIO);
1340
1341         if (!skb)
1342                 goto rel_resource;
1343         skb->sk = (struct sock *)csk;
1344         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1345
1346         if (!csk->mtu)
1347                 csk->mtu = dst_mtu(csk->dst);
1348         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1349         csk->tx_chan = cxgb4_port_chan(ndev);
1350         /* SMT two entries per row */
1351         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1352         step = lldi->ntxq / lldi->nchan;
1353         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1354         step = lldi->nrxq / lldi->nchan;
1355         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1356         csk->wr_cred = lldi->wr_cred -
1357                        DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1358         csk->wr_max_cred = csk->wr_cred;
1359         csk->wr_una_cred = 0;
1360         cxgbi_sock_reset_wr_list(csk);
1361         csk->err = 0;
1362
1363         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
1364                        (&csk->saddr), (&csk->daddr), csk, csk->state,
1365                        csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
1366                        csk->mtu, csk->mss_idx, csk->smac_idx);
1367
1368         /* must wait for either a act_open_rpl or act_open_establish */
1369         try_module_get(THIS_MODULE);
1370         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1371         if (csk->csk_family == AF_INET)
1372                 send_act_open_req(csk, skb, csk->l2t);
1373         else
1374                 send_act_open_req6(csk, skb, csk->l2t);
1375         neigh_release(n);
1376
1377         return 0;
1378
1379 rel_resource:
1380         if (n)
1381                 neigh_release(n);
1382         if (skb)
1383                 __kfree_skb(skb);
1384         return -EINVAL;
1385 }
1386
1387 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1388         [CPL_ACT_ESTABLISH] = do_act_establish,
1389         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1390         [CPL_PEER_CLOSE] = do_peer_close,
1391         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1392         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1393         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1394         [CPL_FW4_ACK] = do_fw4_ack,
1395         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1396         [CPL_ISCSI_DATA] = do_rx_iscsi_hdr,
1397         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1398         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1399         [CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
1400 };
1401
1402 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1403 {
1404         int rc;
1405
1406         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1407                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1408
1409         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1410                                         cxgb4i_max_connect);
1411         if (rc < 0)
1412                 return rc;
1413
1414         cdev->csk_release_offload_resources = release_offload_resources;
1415         cdev->csk_push_tx_frames = push_tx_frames;
1416         cdev->csk_send_abort_req = send_abort_req;
1417         cdev->csk_send_close_req = send_close_req;
1418         cdev->csk_send_rx_credits = send_rx_credits;
1419         cdev->csk_alloc_cpls = alloc_cpls;
1420         cdev->csk_init_act_open = init_act_open;
1421
1422         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1423         return 0;
1424 }
1425
1426 /*
1427  * functions to program the pagepod in h/w
1428  */
1429 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1430 static inline void ulp_mem_io_set_hdr(struct cxgb4_lld_info *lldi,
1431                                 struct ulp_mem_io *req,
1432                                 unsigned int wr_len, unsigned int dlen,
1433                                 unsigned int pm_addr)
1434 {
1435         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1436
1437         INIT_ULPTX_WR(req, wr_len, 0, 0);
1438         if (is_t4(lldi->adapter_type))
1439                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1440                                         (ULP_MEMIO_ORDER(1)));
1441         else
1442                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1443                                         (V_T5_ULP_MEMIO_IMM(1)));
1444         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1445         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1446         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1447
1448         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1449         idata->len = htonl(dlen);
1450 }
1451
1452 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1453                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1454                                 unsigned int npods,
1455                                 struct cxgbi_gather_list *gl,
1456                                 unsigned int gl_pidx)
1457 {
1458         struct cxgbi_ddp_info *ddp = cdev->ddp;
1459         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1460         struct sk_buff *skb;
1461         struct ulp_mem_io *req;
1462         struct ulptx_idata *idata;
1463         struct cxgbi_pagepod *ppod;
1464         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1465         unsigned int dlen = PPOD_SIZE * npods;
1466         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1467                                 sizeof(struct ulptx_idata) + dlen, 16);
1468         unsigned int i;
1469
1470         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1471         if (!skb) {
1472                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1473                         cdev, idx, npods);
1474                 return -ENOMEM;
1475         }
1476         req = (struct ulp_mem_io *)skb->head;
1477         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1478
1479         ulp_mem_io_set_hdr(lldi, req, wr_len, dlen, pm_addr);
1480         idata = (struct ulptx_idata *)(req + 1);
1481         ppod = (struct cxgbi_pagepod *)(idata + 1);
1482
1483         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1484                 if (!hdr && !gl)
1485                         cxgbi_ddp_ppod_clear(ppod);
1486                 else
1487                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1488         }
1489
1490         cxgb4_ofld_send(cdev->ports[port_id], skb);
1491         return 0;
1492 }
1493
1494 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1495                         unsigned int idx, unsigned int npods,
1496                         struct cxgbi_gather_list *gl)
1497 {
1498         unsigned int i, cnt;
1499         int err = 0;
1500
1501         for (i = 0; i < npods; i += cnt, idx += cnt) {
1502                 cnt = npods - i;
1503                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1504                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1505                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1506                                         idx, cnt, gl, 4 * i);
1507                 if (err < 0)
1508                         break;
1509         }
1510         return err;
1511 }
1512
1513 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1514                           unsigned int idx, unsigned int npods)
1515 {
1516         unsigned int i, cnt;
1517         int err;
1518
1519         for (i = 0; i < npods; i += cnt, idx += cnt) {
1520                 cnt = npods - i;
1521                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1522                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1523                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1524                                         idx, cnt, NULL, 0);
1525                 if (err < 0)
1526                         break;
1527         }
1528 }
1529
1530 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1531                                 int pg_idx, bool reply)
1532 {
1533         struct sk_buff *skb;
1534         struct cpl_set_tcb_field *req;
1535
1536         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1537                 return 0;
1538
1539         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1540         if (!skb)
1541                 return -ENOMEM;
1542
1543         /*  set up ulp page size */
1544         req = (struct cpl_set_tcb_field *)skb->head;
1545         INIT_TP_WR(req, csk->tid);
1546         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1547         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1548         req->word_cookie = htons(0);
1549         req->mask = cpu_to_be64(0x3 << 8);
1550         req->val = cpu_to_be64(pg_idx << 8);
1551         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1552
1553         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1554                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1555
1556         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1557         return 0;
1558 }
1559
1560 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1561                                  int hcrc, int dcrc, int reply)
1562 {
1563         struct sk_buff *skb;
1564         struct cpl_set_tcb_field *req;
1565
1566         if (!hcrc && !dcrc)
1567                 return 0;
1568
1569         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1570         if (!skb)
1571                 return -ENOMEM;
1572
1573         csk->hcrc_len = (hcrc ? 4 : 0);
1574         csk->dcrc_len = (dcrc ? 4 : 0);
1575         /*  set up ulp submode */
1576         req = (struct cpl_set_tcb_field *)skb->head;
1577         INIT_TP_WR(req, tid);
1578         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1579         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1580         req->word_cookie = htons(0);
1581         req->mask = cpu_to_be64(0x3 << 4);
1582         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1583                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1584         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1585
1586         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1587                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1588
1589         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1590         return 0;
1591 }
1592
1593 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1594 {
1595         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1596         struct cxgbi_ddp_info *ddp = cdev->ddp;
1597         unsigned int tagmask, pgsz_factor[4];
1598         int err;
1599
1600         if (ddp) {
1601                 kref_get(&ddp->refcnt);
1602                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1603                         cdev, cdev->ddp);
1604                 return -EALREADY;
1605         }
1606
1607         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1608                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1609                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1610         if (err < 0)
1611                 return err;
1612
1613         ddp = cdev->ddp;
1614
1615         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1616         cxgbi_ddp_page_size_factor(pgsz_factor);
1617         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1618
1619         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1620         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1621         cdev->csk_ddp_set = ddp_set_map;
1622         cdev->csk_ddp_clear = ddp_clear_map;
1623
1624         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1625                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1626                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1627         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1628                 " %u/%u.\n",
1629                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1630                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1631                 ddp->max_rxsz, lldi->iscsi_iolen);
1632         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1633                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1634                 ddp->max_rxsz);
1635         return 0;
1636 }
1637
1638 #if IS_ENABLED(CONFIG_IPV6)
1639 static int cxgbi_inet6addr_handler(struct notifier_block *this,
1640                                    unsigned long event, void *data)
1641 {
1642         struct inet6_ifaddr *ifa = data;
1643         struct net_device *event_dev = ifa->idev->dev;
1644         struct cxgbi_device *cdev;
1645         int ret = NOTIFY_DONE;
1646
1647         if (event_dev->priv_flags & IFF_802_1Q_VLAN)
1648                 event_dev = vlan_dev_real_dev(event_dev);
1649
1650         cdev = cxgbi_device_find_by_netdev_rcu(event_dev, NULL);
1651
1652         if (!cdev)
1653                 return ret;
1654
1655         switch (event) {
1656         case NETDEV_UP:
1657                 ret = cxgb4_clip_get(event_dev,
1658                                      (const struct in6_addr *)
1659                                      ((ifa)->addr.s6_addr));
1660                 if (ret < 0)
1661                         return ret;
1662
1663                 ret = NOTIFY_OK;
1664                 break;
1665
1666         case NETDEV_DOWN:
1667                 cxgb4_clip_release(event_dev,
1668                                    (const struct in6_addr *)
1669                                    ((ifa)->addr.s6_addr));
1670                 ret = NOTIFY_OK;
1671                 break;
1672
1673         default:
1674                 break;
1675         }
1676
1677         return ret;
1678 }
1679
1680 static struct notifier_block cxgbi_inet6addr_notifier = {
1681         .notifier_call = cxgbi_inet6addr_handler
1682 };
1683
1684 /* Retrieve IPv6 addresses from a root device (bond, vlan) associated with
1685  * a physical device.
1686  * The physical device reference is needed to send the actual CLIP command.
1687  */
1688 static int update_dev_clip(struct net_device *root_dev, struct net_device *dev)
1689 {
1690         struct inet6_dev *idev = NULL;
1691         struct inet6_ifaddr *ifa;
1692         int ret = 0;
1693
1694         idev = __in6_dev_get(root_dev);
1695         if (!idev)
1696                 return ret;
1697
1698         read_lock_bh(&idev->lock);
1699         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1700                 pr_info("updating the clip for addr %pI6\n",
1701                         ifa->addr.s6_addr);
1702                 ret = cxgb4_clip_get(dev, (const struct in6_addr *)
1703                                      ifa->addr.s6_addr);
1704                 if (ret < 0)
1705                         break;
1706         }
1707
1708         read_unlock_bh(&idev->lock);
1709         return ret;
1710 }
1711
1712 static int update_root_dev_clip(struct net_device *dev)
1713 {
1714         struct net_device *root_dev = NULL;
1715         int i, ret = 0;
1716
1717         /* First populate the real net device's IPv6 address */
1718         ret = update_dev_clip(dev, dev);
1719         if (ret)
1720                 return ret;
1721
1722         /* Parse all bond and vlan devices layered on top of the physical dev */
1723         root_dev = netdev_master_upper_dev_get(dev);
1724         if (root_dev) {
1725                 ret = update_dev_clip(root_dev, dev);
1726                 if (ret)
1727                         return ret;
1728         }
1729
1730         for (i = 0; i < VLAN_N_VID; i++) {
1731                 root_dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), i);
1732                 if (!root_dev)
1733                         continue;
1734
1735                 ret = update_dev_clip(root_dev, dev);
1736                 if (ret)
1737                         break;
1738         }
1739         return ret;
1740 }
1741
1742 static void cxgbi_update_clip(struct cxgbi_device *cdev)
1743 {
1744         int i;
1745
1746         rcu_read_lock();
1747
1748         for (i = 0; i < cdev->nports; i++) {
1749                 struct net_device *dev = cdev->ports[i];
1750                 int ret = 0;
1751
1752                 if (dev)
1753                         ret = update_root_dev_clip(dev);
1754                 if (ret < 0)
1755                         break;
1756         }
1757         rcu_read_unlock();
1758 }
1759 #endif /* IS_ENABLED(CONFIG_IPV6) */
1760
1761 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1762 {
1763         struct cxgbi_device *cdev;
1764         struct port_info *pi;
1765         int i, rc;
1766
1767         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1768         if (!cdev) {
1769                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1770                 return NULL;
1771         }
1772         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1773                 cdev, lldi->adapter_type, lldi->nports,
1774                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1775                 lldi->nrxq, lldi->wr_cred);
1776         for (i = 0; i < lldi->nrxq; i++)
1777                 log_debug(1 << CXGBI_DBG_DEV,
1778                         "t4 0x%p, rxq id #%d: %u.\n",
1779                         cdev, i, lldi->rxq_ids[i]);
1780
1781         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1782         cdev->flags = CXGBI_FLAG_DEV_T4;
1783         cdev->pdev = lldi->pdev;
1784         cdev->ports = lldi->ports;
1785         cdev->nports = lldi->nports;
1786         cdev->mtus = lldi->mtus;
1787         cdev->nmtus = NMTUS;
1788         cdev->snd_win = cxgb4i_snd_win;
1789         cdev->rcv_win = cxgb4i_rcv_win;
1790         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1791         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1792         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1793         cdev->itp = &cxgb4i_iscsi_transport;
1794
1795         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1796         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1797                 cdev, lldi->ports[0]->name, cdev->pfvf);
1798
1799         rc = cxgb4i_ddp_init(cdev);
1800         if (rc) {
1801                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1802                 goto err_out;
1803         }
1804         rc = cxgb4i_ofld_init(cdev);
1805         if (rc) {
1806                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1807                 goto err_out;
1808         }
1809
1810         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1811                                 &cxgb4i_host_template, cxgb4i_stt);
1812         if (rc)
1813                 goto err_out;
1814
1815         for (i = 0; i < cdev->nports; i++) {
1816                 pi = netdev_priv(lldi->ports[i]);
1817                 cdev->hbas[i]->port_id = pi->port_id;
1818         }
1819         return cdev;
1820
1821 err_out:
1822         cxgbi_device_unregister(cdev);
1823         return ERR_PTR(-ENOMEM);
1824 }
1825
1826 #define RX_PULL_LEN     128
1827 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1828                                 const struct pkt_gl *pgl)
1829 {
1830         const struct cpl_act_establish *rpl;
1831         struct sk_buff *skb;
1832         unsigned int opc;
1833         struct cxgbi_device *cdev = handle;
1834
1835         if (pgl == NULL) {
1836                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1837
1838                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1839                 if (!skb)
1840                         goto nomem;
1841                 skb_copy_to_linear_data(skb, &rsp[1], len);
1842         } else {
1843                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1844                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1845                                 pgl->va, be64_to_cpu(*rsp),
1846                                 be64_to_cpu(*(u64 *)pgl->va),
1847                                 pgl->tot_len);
1848                         return 0;
1849                 }
1850                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1851                 if (unlikely(!skb))
1852                         goto nomem;
1853         }
1854
1855         rpl = (struct cpl_act_establish *)skb->data;
1856         opc = rpl->ot.opcode;
1857         log_debug(1 << CXGBI_DBG_TOE,
1858                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1859                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1860         if (cxgb4i_cplhandlers[opc])
1861                 cxgb4i_cplhandlers[opc](cdev, skb);
1862         else {
1863                 pr_err("No handler for opcode 0x%x.\n", opc);
1864                 __kfree_skb(skb);
1865         }
1866         return 0;
1867 nomem:
1868         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1869         return 1;
1870 }
1871
1872 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1873 {
1874         struct cxgbi_device *cdev = handle;
1875
1876         switch (state) {
1877         case CXGB4_STATE_UP:
1878                 pr_info("cdev 0x%p, UP.\n", cdev);
1879 #if IS_ENABLED(CONFIG_IPV6)
1880                 cxgbi_update_clip(cdev);
1881 #endif
1882                 /* re-initialize */
1883                 break;
1884         case CXGB4_STATE_START_RECOVERY:
1885                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1886                 /* close all connections */
1887                 break;
1888         case CXGB4_STATE_DOWN:
1889                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1890                 break;
1891         case CXGB4_STATE_DETACH:
1892                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1893                 cxgbi_device_unregister(cdev);
1894                 break;
1895         default:
1896                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1897                 break;
1898         }
1899         return 0;
1900 }
1901
1902 static int __init cxgb4i_init_module(void)
1903 {
1904         int rc;
1905
1906         printk(KERN_INFO "%s", version);
1907
1908         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1909         if (rc < 0)
1910                 return rc;
1911         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1912
1913 #if IS_ENABLED(CONFIG_IPV6)
1914         register_inet6addr_notifier(&cxgbi_inet6addr_notifier);
1915 #endif
1916         return 0;
1917 }
1918
1919 static void __exit cxgb4i_exit_module(void)
1920 {
1921 #if IS_ENABLED(CONFIG_IPV6)
1922         unregister_inet6addr_notifier(&cxgbi_inet6addr_notifier);
1923 #endif
1924         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1925         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1926         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1927 }
1928
1929 module_init(cxgb4i_init_module);
1930 module_exit(cxgb4i_exit_module);