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 #if IS_ENABLED(CONFIG_IPV6)
 263 static void send_act_open_req6(struct cxgbi_sock *csk, struct sk_buff *skb,
 264                                struct l2t_entry *e)
 265 {
 266         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 267         int t4 = is_t4(lldi->adapter_type);
 268         int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
 269         unsigned long long opt0;
 270         unsigned int opt2;
 271         unsigned int qid_atid = ((unsigned int)csk->atid) |
 272                                  (((unsigned int)csk->rss_qid) << 14);
 273
 274         opt0 = KEEP_ALIVE(1) |
 275                 WND_SCALE(wscale) |
 276                 MSS_IDX(csk->mss_idx) |
 277                 L2T_IDX(((struct l2t_entry *)csk->l2t)->idx) |
 278                 TX_CHAN(csk->tx_chan) |
 279                 SMAC_SEL(csk->smac_idx) |
 280                 ULP_MODE(ULP_MODE_ISCSI) |
 281                 RCV_BUFSIZ(cxgb4i_rcv_win >> 10);
 282
 283         opt2 = RX_CHANNEL(0) |
 284                 RSS_QUEUE_VALID |
 285                 RX_FC_DISABLE |
 286                 RSS_QUEUE(csk->rss_qid);
 287
 288         if (t4) {
 289                 struct cpl_act_open_req6 *req =
 290                             (struct cpl_act_open_req6 *)skb->head;
 291
 292                 INIT_TP_WR(req, 0);
 293                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
 294                                                             qid_atid));
 295                 req->local_port = csk->saddr6.sin6_port;
 296                 req->peer_port = csk->daddr6.sin6_port;
 297
 298                 req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
 299                 req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
 300                                                                     8);
 301                 req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
 302                 req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
 303                                                                     8);
 304
 305                 req->opt0 = cpu_to_be64(opt0);
 306
 307                 opt2 |= RX_FC_VALID;
 308                 req->opt2 = cpu_to_be32(opt2);
 309
 310                 req->params = cpu_to_be32(cxgb4_select_ntuple(
 311                                           csk->cdev->ports[csk->port_id],
 312                                           csk->l2t));
 313         } else {
 314                 struct cpl_t5_act_open_req6 *req =
 315                                 (struct cpl_t5_act_open_req6 *)skb->head;
 316
 317                 INIT_TP_WR(req, 0);
 318                 OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
 319                                                             qid_atid));
 320                 req->local_port = csk->saddr6.sin6_port;
 321                 req->peer_port = csk->daddr6.sin6_port;
 322                 req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
 323                 req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
 324                                                                         8);
 325                 req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
 326                 req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
 327                                                                         8);
 328                 req->opt0 = cpu_to_be64(opt0);
 329
 330                 opt2 |= T5_OPT_2_VALID;
 331                 req->opt2 = cpu_to_be32(opt2);
 332
 333                 req->params = cpu_to_be64(V_FILTER_TUPLE(cxgb4_select_ntuple(
 334                                           csk->cdev->ports[csk->port_id],
 335                                           csk->l2t)));
 336         }
 337
 338         set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
 339
 340         pr_info("t%d csk 0x%p,%u,0x%lx,%u, [%pI6]:%u-[%pI6]:%u, rss_qid %u.\n",
 341                 t4 ? 4 : 5, csk, csk->state, csk->flags, csk->atid,
 342                 &csk->saddr6.sin6_addr, ntohs(csk->saddr.sin_port),
 343                 &csk->daddr6.sin6_addr, ntohs(csk->daddr.sin_port),
 344                 csk->rss_qid);
 345
 346         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 347 }
 348 #endif
 349
 350 static void send_close_req(struct cxgbi_sock *csk)
 351 {
 352         struct sk_buff *skb = csk->cpl_close;
 353         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 354         unsigned int tid = csk->tid;
 355
 356         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 357                 "csk 0x%p,%u,0x%lx, tid %u.\n",
 358                 csk, csk->state, csk->flags, csk->tid);
 359         csk->cpl_close = NULL;
 360         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 361         INIT_TP_WR(req, tid);
 362         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 363         req->rsvd = 0;
 364
 365         cxgbi_sock_skb_entail(csk, skb);
 366         if (csk->state >= CTP_ESTABLISHED)
 367                 push_tx_frames(csk, 1);
 368 }
 369
 370 static void abort_arp_failure(void *handle, struct sk_buff *skb)
 371 {
 372         struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
 373         struct cpl_abort_req *req;
 374
 375         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 376                 "csk 0x%p,%u,0x%lx, tid %u, abort.\n",
 377                 csk, csk->state, csk->flags, csk->tid);
 378         req = (struct cpl_abort_req *)skb->data;
 379         req->cmd = CPL_ABORT_NO_RST;
 380         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 381 }
 382
 383 static void send_abort_req(struct cxgbi_sock *csk)
 384 {
 385         struct cpl_abort_req *req;
 386         struct sk_buff *skb = csk->cpl_abort_req;
 387
 388         if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
 389                 return;
 390         cxgbi_sock_set_state(csk, CTP_ABORTING);
 391         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 392         cxgbi_sock_purge_write_queue(csk);
 393
 394         csk->cpl_abort_req = NULL;
 395         req = (struct cpl_abort_req *)skb->head;
 396         set_queue(skb, CPL_PRIORITY_DATA, csk);
 397         req->cmd = CPL_ABORT_SEND_RST;
 398         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
 399         INIT_TP_WR(req, csk->tid);
 400         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 401         req->rsvd0 = htonl(csk->snd_nxt);
 402         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 403
 404         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 405                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 406                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 407                 req->rsvd1);
 408
 409         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 410 }
 411
 412 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 413 {
 414         struct sk_buff *skb = csk->cpl_abort_rpl;
 415         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 416
 417         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 418                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 419                 csk, csk->state, csk->flags, csk->tid, rst_status);
 420
 421         csk->cpl_abort_rpl = NULL;
 422         set_queue(skb, CPL_PRIORITY_DATA, csk);
 423         INIT_TP_WR(rpl, csk->tid);
 424         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 425         rpl->cmd = rst_status;
 426         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 427 }
 428
 429 /*
 430  * CPL connection rx data ack: host ->
 431  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 432  * credits sent.
 433  */
 434 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 435 {
 436         struct sk_buff *skb;
 437         struct cpl_rx_data_ack *req;
 438
 439         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 440                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
 441                 csk, csk->state, csk->flags, csk->tid, credits);
 442
 443         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 444         if (!skb) {
 445                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 446                 return 0;
 447         }
 448         req = (struct cpl_rx_data_ack *)skb->head;
 449
 450         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
 451         INIT_TP_WR(req, csk->tid);
 452         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
 453                                       csk->tid));
 454         req->credit_dack = cpu_to_be32(RX_CREDITS(credits) | RX_FORCE_ACK(1));
 455         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 456         return credits;
 457 }
 458
 459 /*
 460  * sgl_len - calculates the size of an SGL of the given capacity
 461  * @n: the number of SGL entries
 462  * Calculates the number of flits needed for a scatter/gather list that
 463  * can hold the given number of entries.
 464  */
 465 static inline unsigned int sgl_len(unsigned int n)
 466 {
 467         n--;
 468         return (3 * n) / 2 + (n & 1) + 2;
 469 }
 470
 471 /*
 472  * calc_tx_flits_ofld - calculate # of flits for an offload packet
 473  * @skb: the packet
 474  *
 475  * Returns the number of flits needed for the given offload packet.
 476  * These packets are already fully constructed and no additional headers
 477  * will be added.
 478  */
 479 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
 480 {
 481         unsigned int flits, cnt;
 482
 483         if (is_ofld_imm(skb))
 484                 return DIV_ROUND_UP(skb->len, 8);
 485         flits = skb_transport_offset(skb) / 8;
 486         cnt = skb_shinfo(skb)->nr_frags;
 487         if (skb_tail_pointer(skb) != skb_transport_header(skb))
 488                 cnt++;
 489         return flits + sgl_len(cnt);
 490 }
 491
 492 static inline void send_tx_flowc_wr(struct cxgbi_sock *csk)
 493 {
 494         struct sk_buff *skb;
 495         struct fw_flowc_wr *flowc;
 496         int flowclen, i;
 497
 498         flowclen = 80;
 499         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
 500         flowc = (struct fw_flowc_wr *)skb->head;
 501         flowc->op_to_nparams =
 502                 htonl(FW_WR_OP(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS(8));
 503         flowc->flowid_len16 =
 504                 htonl(FW_WR_LEN16(DIV_ROUND_UP(72, 16)) |
 505                                 FW_WR_FLOWID(csk->tid));
 506         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
 507         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
 508         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
 509         flowc->mnemval[1].val = htonl(csk->tx_chan);
 510         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
 511         flowc->mnemval[2].val = htonl(csk->tx_chan);
 512         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
 513         flowc->mnemval[3].val = htonl(csk->rss_qid);
 514         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
 515         flowc->mnemval[4].val = htonl(csk->snd_nxt);
 516         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
 517         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
 518         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
 519         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
 520         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
 521         flowc->mnemval[7].val = htonl(csk->advmss);
 522         flowc->mnemval[8].mnemonic = 0;
 523         flowc->mnemval[8].val = 0;
 524         for (i = 0; i < 9; i++) {
 525                 flowc->mnemval[i].r4[0] = 0;
 526                 flowc->mnemval[i].r4[1] = 0;
 527                 flowc->mnemval[i].r4[2] = 0;
 528         }
 529         set_queue(skb, CPL_PRIORITY_DATA, csk);
 530
 531         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 532                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
 533                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
 534                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
 535                 csk->advmss);
 536
 537         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 538 }
 539
 540 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 541                                    int dlen, int len, u32 credits, int compl)
 542 {
 543         struct fw_ofld_tx_data_wr *req;
 544         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
 545         unsigned int wr_ulp_mode = 0;
 546
 547         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 548
 549         if (is_ofld_imm(skb)) {
 550                 req->op_to_immdlen = htonl(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 551                                         FW_WR_COMPL(1) |
 552                                         FW_WR_IMMDLEN(dlen));
 553                 req->flowid_len16 = htonl(FW_WR_FLOWID(csk->tid) |
 554                                                 FW_WR_LEN16(credits));
 555         } else {
 556                 req->op_to_immdlen =
 557                         cpu_to_be32(FW_WR_OP(FW_OFLD_TX_DATA_WR) |
 558                                         FW_WR_COMPL(1) |
 559                                         FW_WR_IMMDLEN(0));
 560                 req->flowid_len16 =
 561                         cpu_to_be32(FW_WR_FLOWID(csk->tid) |
 562                                         FW_WR_LEN16(credits));
 563         }
 564         if (submode)
 565                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE(ULP2_MODE_ISCSI) |
 566                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE(submode);
 567         req->tunnel_to_proxy = htonl(wr_ulp_mode |
 568                  FW_OFLD_TX_DATA_WR_SHOVE(skb_peek(&csk->write_queue) ? 0 : 1));
 569         req->plen = htonl(len);
 570         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
 571                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 572 }
 573
 574 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 575 {
 576         kfree_skb(skb);
 577 }
 578
 579 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 580 {
 581         int total_size = 0;
 582         struct sk_buff *skb;
 583
 584         if (unlikely(csk->state < CTP_ESTABLISHED ||
 585                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 586                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
 587                          1 << CXGBI_DBG_PDU_TX,
 588                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 589                         csk, csk->state, csk->flags, csk->tid);
 590                 return 0;
 591         }
 592
 593         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 594                 int dlen = skb->len;
 595                 int len = skb->len;
 596                 unsigned int credits_needed;
 597
 598                 skb_reset_transport_header(skb);
 599                 if (is_ofld_imm(skb))
 600                         credits_needed = DIV_ROUND_UP(dlen +
 601                                         sizeof(struct fw_ofld_tx_data_wr), 16);
 602                 else
 603                         credits_needed = DIV_ROUND_UP(8*calc_tx_flits_ofld(skb)
 604                                         + sizeof(struct fw_ofld_tx_data_wr),
 605                                         16);
 606
 607                 if (csk->wr_cred < credits_needed) {
 608                         log_debug(1 << CXGBI_DBG_PDU_TX,
 609                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
 610                                 csk, skb->len, skb->data_len,
 611                                 credits_needed, csk->wr_cred);
 612                         break;
 613                 }
 614                 __skb_unlink(skb, &csk->write_queue);
 615                 set_queue(skb, CPL_PRIORITY_DATA, csk);
 616                 skb->csum = credits_needed;
 617                 csk->wr_cred -= credits_needed;
 618                 csk->wr_una_cred += credits_needed;
 619                 cxgbi_sock_enqueue_wr(csk, skb);
 620
 621                 log_debug(1 << CXGBI_DBG_PDU_TX,
 622                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 623                         csk, skb->len, skb->data_len, credits_needed,
 624                         csk->wr_cred, csk->wr_una_cred);
 625
 626                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 627                         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 628                                 send_tx_flowc_wr(csk);
 629                                 skb->csum += 5;
 630                                 csk->wr_cred -= 5;
 631                                 csk->wr_una_cred += 5;
 632                         }
 633                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 634                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
 635                                         req_completion);
 636                         csk->snd_nxt += len;
 637                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 638                 }
 639                 total_size += skb->truesize;
 640                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
 641
 642                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 643                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
 644                         csk, csk->state, csk->flags, csk->tid, skb, len);
 645
 646                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 647         }
 648         return total_size;
 649 }
 650
 651 static inline void free_atid(struct cxgbi_sock *csk)
 652 {
 653         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 654
 655         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 656                 cxgb4_free_atid(lldi->tids, csk->atid);
 657                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 658                 cxgbi_sock_put(csk);
 659         }
 660 }
 661
 662 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
 663 {
 664         struct cxgbi_sock *csk;
 665         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
 666         unsigned short tcp_opt = ntohs(req->tcp_opt);
 667         unsigned int tid = GET_TID(req);
 668         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
 669         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 670         struct tid_info *t = lldi->tids;
 671         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
 672
 673         csk = lookup_atid(t, atid);
 674         if (unlikely(!csk)) {
 675                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
 676                 goto rel_skb;
 677         }
 678
 679         if (csk->atid != atid) {
 680                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
 681                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
 682                 goto rel_skb;
 683         }
 684
 685         pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 686                        (&csk->saddr), (&csk->daddr),
 687                        atid, tid, csk, csk->state, csk->flags, rcv_isn);
 688
 689         module_put(THIS_MODULE);
 690
 691         cxgbi_sock_get(csk);
 692         csk->tid = tid;
 693         cxgb4_insert_tid(lldi->tids, csk, tid);
 694         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 695
 696         free_atid(csk);
 697
 698         spin_lock_bh(&csk->lock);
 699         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 700                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 701                         csk, csk->state, csk->flags, csk->tid);
 702
 703         if (csk->retry_timer.function) {
 704                 del_timer(&csk->retry_timer);
 705                 csk->retry_timer.function = NULL;
 706         }
 707
 708         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 709         /*
 710          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
 711          * pass through opt0.
 712          */
 713         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
 714                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
 715
 716         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
 717         if (GET_TCPOPT_TSTAMP(tcp_opt))
 718                 csk->advmss -= 12;
 719         if (csk->advmss < 128)
 720                 csk->advmss = 128;
 721
 722         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 723                 "csk 0x%p, mss_idx %u, advmss %u.\n",
 724                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
 725
 726         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 727
 728         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 729                 send_abort_req(csk);
 730         else {
 731                 if (skb_queue_len(&csk->write_queue))
 732                         push_tx_frames(csk, 0);
 733                 cxgbi_conn_tx_open(csk);
 734         }
 735         spin_unlock_bh(&csk->lock);
 736
 737 rel_skb:
 738         __kfree_skb(skb);
 739 }
 740
 741 static int act_open_rpl_status_to_errno(int status)
 742 {
 743         switch (status) {
 744         case CPL_ERR_CONN_RESET:
 745                 return -ECONNREFUSED;
 746         case CPL_ERR_ARP_MISS:
 747                 return -EHOSTUNREACH;
 748         case CPL_ERR_CONN_TIMEDOUT:
 749                 return -ETIMEDOUT;
 750         case CPL_ERR_TCAM_FULL:
 751                 return -ENOMEM;
 752         case CPL_ERR_CONN_EXIST:
 753                 return -EADDRINUSE;
 754         default:
 755                 return -EIO;
 756         }
 757 }
 758
 759 static void csk_act_open_retry_timer(unsigned long data)
 760 {
 761         struct sk_buff *skb = NULL;
 762         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 763         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 764         void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
 765                                    struct l2t_entry *);
 766         int t4 = is_t4(lldi->adapter_type), size, size6;
 767
 768         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 769                 "csk 0x%p,%u,0x%lx,%u.\n",
 770                 csk, csk->state, csk->flags, csk->tid);
 771
 772         cxgbi_sock_get(csk);
 773         spin_lock_bh(&csk->lock);
 774
 775         if (t4) {
 776                 size = sizeof(struct cpl_act_open_req);
 777                 size6 = sizeof(struct cpl_act_open_req6);
 778         } else {
 779                 size = sizeof(struct cpl_t5_act_open_req);
 780                 size6 = sizeof(struct cpl_t5_act_open_req6);
 781         }
 782
 783         if (csk->csk_family == AF_INET) {
 784                 send_act_open_func = send_act_open_req;
 785                 skb = alloc_wr(size, 0, GFP_ATOMIC);
 786 #if IS_ENABLED(CONFIG_IPV6)
 787         } else {
 788                 send_act_open_func = send_act_open_req6;
 789                 skb = alloc_wr(size6, 0, GFP_ATOMIC);
 790 #endif
 791         }
 792
 793         if (!skb)
 794                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 795         else {
 796                 skb->sk = (struct sock *)csk;
 797                 t4_set_arp_err_handler(skb, csk,
 798                                        cxgbi_sock_act_open_req_arp_failure);
 799                 send_act_open_func(csk, skb, csk->l2t);
 800         }
 801
 802         spin_unlock_bh(&csk->lock);
 803         cxgbi_sock_put(csk);
 804
 805 }
 806
 807 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 808 {
 809         struct cxgbi_sock *csk;
 810         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
 811         unsigned int tid = GET_TID(rpl);
 812         unsigned int atid =
 813                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
 814         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
 815         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 816         struct tid_info *t = lldi->tids;
 817
 818         csk = lookup_atid(t, atid);
 819         if (unlikely(!csk)) {
 820                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
 821                 goto rel_skb;
 822         }
 823
 824         pr_info_ipaddr("tid %u/%u, status %u.\n"
 825                        "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
 826                        atid, tid, status, csk, csk->state, csk->flags);
 827
 828         if (status == CPL_ERR_RTX_NEG_ADVICE)
 829                 goto rel_skb;
 830
 831         if (status && status != CPL_ERR_TCAM_FULL &&
 832             status != CPL_ERR_CONN_EXIST &&
 833             status != CPL_ERR_ARP_MISS)
 834                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 835
 836         cxgbi_sock_get(csk);
 837         spin_lock_bh(&csk->lock);
 838
 839         if (status == CPL_ERR_CONN_EXIST &&
 840             csk->retry_timer.function != csk_act_open_retry_timer) {
 841                 csk->retry_timer.function = csk_act_open_retry_timer;
 842                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 843         } else
 844                 cxgbi_sock_fail_act_open(csk,
 845                                         act_open_rpl_status_to_errno(status));
 846
 847         spin_unlock_bh(&csk->lock);
 848         cxgbi_sock_put(csk);
 849 rel_skb:
 850         __kfree_skb(skb);
 851 }
 852
 853 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 854 {
 855         struct cxgbi_sock *csk;
 856         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 857         unsigned int tid = GET_TID(req);
 858         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 859         struct tid_info *t = lldi->tids;
 860
 861         csk = lookup_tid(t, tid);
 862         if (unlikely(!csk)) {
 863                 pr_err("can't find connection for tid %u.\n", tid);
 864                 goto rel_skb;
 865         }
 866         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 867                        (&csk->saddr), (&csk->daddr),
 868                        csk, csk->state, csk->flags, csk->tid);
 869         cxgbi_sock_rcv_peer_close(csk);
 870 rel_skb:
 871         __kfree_skb(skb);
 872 }
 873
 874 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 875 {
 876         struct cxgbi_sock *csk;
 877         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 878         unsigned int tid = GET_TID(rpl);
 879         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 880         struct tid_info *t = lldi->tids;
 881
 882         csk = lookup_tid(t, tid);
 883         if (unlikely(!csk)) {
 884                 pr_err("can't find connection for tid %u.\n", tid);
 885                 goto rel_skb;
 886         }
 887         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 888                        (&csk->saddr), (&csk->daddr),
 889                        csk, csk->state, csk->flags, csk->tid);
 890         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 891 rel_skb:
 892         __kfree_skb(skb);
 893 }
 894
 895 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 896                                                                 int *need_rst)
 897 {
 898         switch (abort_reason) {
 899         case CPL_ERR_BAD_SYN: /* fall through */
 900         case CPL_ERR_CONN_RESET:
 901                 return csk->state > CTP_ESTABLISHED ?
 902                         -EPIPE : -ECONNRESET;
 903         case CPL_ERR_XMIT_TIMEDOUT:
 904         case CPL_ERR_PERSIST_TIMEDOUT:
 905         case CPL_ERR_FINWAIT2_TIMEDOUT:
 906         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 907                 return -ETIMEDOUT;
 908         default:
 909                 return -EIO;
 910         }
 911 }
 912
 913 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 914 {
 915         struct cxgbi_sock *csk;
 916         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 917         unsigned int tid = GET_TID(req);
 918         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 919         struct tid_info *t = lldi->tids;
 920         int rst_status = CPL_ABORT_NO_RST;
 921
 922         csk = lookup_tid(t, tid);
 923         if (unlikely(!csk)) {
 924                 pr_err("can't find connection for tid %u.\n", tid);
 925                 goto rel_skb;
 926         }
 927
 928         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 929                        (&csk->saddr), (&csk->daddr),
 930                        csk, csk->state, csk->flags, csk->tid, req->status);
 931
 932         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 933             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 934                 goto rel_skb;
 935
 936         cxgbi_sock_get(csk);
 937         spin_lock_bh(&csk->lock);
 938
 939         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 940
 941         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 942                 send_tx_flowc_wr(csk);
 943                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 944         }
 945
 946         cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 947         cxgbi_sock_set_state(csk, CTP_ABORTING);
 948
 949         send_abort_rpl(csk, rst_status);
 950
 951         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 952                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 953                 cxgbi_sock_closed(csk);
 954         }
 955
 956         spin_unlock_bh(&csk->lock);
 957         cxgbi_sock_put(csk);
 958 rel_skb:
 959         __kfree_skb(skb);
 960 }
 961
 962 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 963 {
 964         struct cxgbi_sock *csk;
 965         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 966         unsigned int tid = GET_TID(rpl);
 967         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 968         struct tid_info *t = lldi->tids;
 969
 970         csk = lookup_tid(t, tid);
 971         if (!csk)
 972                 goto rel_skb;
 973
 974         if (csk)
 975                 pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 976                                (&csk->saddr), (&csk->daddr), csk,
 977                                csk->state, csk->flags, csk->tid, rpl->status);
 978
 979         if (rpl->status == CPL_ERR_ABORT_FAILED)
 980                 goto rel_skb;
 981
 982         cxgbi_sock_rcv_abort_rpl(csk);
 983 rel_skb:
 984         __kfree_skb(skb);
 985 }
 986
 987 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 988 {
 989         struct cxgbi_sock *csk;
 990         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 991         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 992         unsigned int tid = GET_TID(cpl);
 993         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 994         struct tid_info *t = lldi->tids;
 995
 996         csk = lookup_tid(t, tid);
 997         if (unlikely(!csk)) {
 998                 pr_err("can't find conn. for tid %u.\n", tid);
 999                 goto rel_skb;
1000         }
1001
1002         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1003                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
1004                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
1005                 pdu_len_ddp);
1006
1007         spin_lock_bh(&csk->lock);
1008
1009         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1010                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1011                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1012                         csk, csk->state, csk->flags, csk->tid);
1013                 if (csk->state != CTP_ABORTING)
1014                         goto abort_conn;
1015                 else
1016                         goto discard;
1017         }
1018
1019         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
1020         cxgbi_skcb_flags(skb) = 0;
1021
1022         skb_reset_transport_header(skb);
1023         __skb_pull(skb, sizeof(*cpl));
1024         __pskb_trim(skb, ntohs(cpl->len));
1025
1026         if (!csk->skb_ulp_lhdr) {
1027                 unsigned char *bhs;
1028                 unsigned int hlen, dlen, plen;
1029
1030                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1031                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
1032                         csk, csk->state, csk->flags, csk->tid, skb);
1033                 csk->skb_ulp_lhdr = skb;
1034                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
1035
1036                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
1037                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
1038                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
1039                                 csk->rcv_nxt);
1040                         goto abort_conn;
1041                 }
1042
1043                 bhs = skb->data;
1044                 hlen = ntohs(cpl->len);
1045                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
1046
1047                 plen = ISCSI_PDU_LEN(pdu_len_ddp);
1048                 if (is_t4(lldi->adapter_type))
1049                         plen -= 40;
1050
1051                 if ((hlen + dlen) != plen) {
1052                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
1053                                 "mismatch %u != %u + %u, seq 0x%x.\n",
1054                                 csk->tid, plen, hlen, dlen,
1055                                 cxgbi_skcb_tcp_seq(skb));
1056                         goto abort_conn;
1057                 }
1058
1059                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
1060                 if (dlen)
1061                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
1062                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
1063
1064                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1065                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
1066                         csk, skb, *bhs, hlen, dlen,
1067                         ntohl(*((unsigned int *)(bhs + 16))),
1068                         ntohl(*((unsigned int *)(bhs + 24))));
1069
1070         } else {
1071                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
1072
1073                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
1074                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1075                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1076                         csk, csk->state, csk->flags, skb, lskb);
1077         }
1078
1079         __skb_queue_tail(&csk->receive_queue, skb);
1080         spin_unlock_bh(&csk->lock);
1081         return;
1082
1083 abort_conn:
1084         send_abort_req(csk);
1085 discard:
1086         spin_unlock_bh(&csk->lock);
1087 rel_skb:
1088         __kfree_skb(skb);
1089 }
1090
1091 static void do_rx_data_ddp(struct cxgbi_device *cdev,
1092                                   struct sk_buff *skb)
1093 {
1094         struct cxgbi_sock *csk;
1095         struct sk_buff *lskb;
1096         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
1097         unsigned int tid = GET_TID(rpl);
1098         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1099         struct tid_info *t = lldi->tids;
1100         unsigned int status = ntohl(rpl->ddpvld);
1101
1102         csk = lookup_tid(t, tid);
1103         if (unlikely(!csk)) {
1104                 pr_err("can't find connection for tid %u.\n", tid);
1105                 goto rel_skb;
1106         }
1107
1108         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1109                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
1110                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
1111
1112         spin_lock_bh(&csk->lock);
1113
1114         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1115                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1116                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1117                         csk, csk->state, csk->flags, csk->tid);
1118                 if (csk->state != CTP_ABORTING)
1119                         goto abort_conn;
1120                 else
1121                         goto discard;
1122         }
1123
1124         if (!csk->skb_ulp_lhdr) {
1125                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
1126                 goto abort_conn;
1127         }
1128
1129         lskb = csk->skb_ulp_lhdr;
1130         csk->skb_ulp_lhdr = NULL;
1131
1132         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
1133
1134         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
1135                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
1136                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
1137
1138         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
1139                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1140                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1141                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
1142         }
1143         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1144                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1145                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1146                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1147         }
1148         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1149                 log_debug(1 << CXGBI_DBG_PDU_RX,
1150                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1151                         csk, lskb, status);
1152                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1153         }
1154         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1155                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1156                 log_debug(1 << CXGBI_DBG_PDU_RX,
1157                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1158                         csk, lskb, status);
1159                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1160         }
1161         log_debug(1 << CXGBI_DBG_PDU_RX,
1162                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1163                 csk, lskb, cxgbi_skcb_flags(lskb));
1164
1165         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1166         cxgbi_conn_pdu_ready(csk);
1167         spin_unlock_bh(&csk->lock);
1168         goto rel_skb;
1169
1170 abort_conn:
1171         send_abort_req(csk);
1172 discard:
1173         spin_unlock_bh(&csk->lock);
1174 rel_skb:
1175         __kfree_skb(skb);
1176 }
1177
1178 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1179 {
1180         struct cxgbi_sock *csk;
1181         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1182         unsigned int tid = GET_TID(rpl);
1183         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1184         struct tid_info *t = lldi->tids;
1185
1186         csk = lookup_tid(t, tid);
1187         if (unlikely(!csk))
1188                 pr_err("can't find connection for tid %u.\n", tid);
1189         else {
1190                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1191                         "csk 0x%p,%u,0x%lx,%u.\n",
1192                         csk, csk->state, csk->flags, csk->tid);
1193                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1194                                         rpl->seq_vld);
1195         }
1196         __kfree_skb(skb);
1197 }
1198
1199 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1200 {
1201         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1202         unsigned int tid = GET_TID(rpl);
1203         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1204         struct tid_info *t = lldi->tids;
1205         struct cxgbi_sock *csk;
1206
1207         csk = lookup_tid(t, tid);
1208         if (!csk)
1209                 pr_err("can't find conn. for tid %u.\n", tid);
1210
1211         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1212                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1213                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1214
1215         if (rpl->status != CPL_ERR_NONE)
1216                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1217                         csk, tid, rpl->status);
1218
1219         __kfree_skb(skb);
1220 }
1221
1222 static int alloc_cpls(struct cxgbi_sock *csk)
1223 {
1224         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1225                                         0, GFP_KERNEL);
1226         if (!csk->cpl_close)
1227                 return -ENOMEM;
1228
1229         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1230                                         0, GFP_KERNEL);
1231         if (!csk->cpl_abort_req)
1232                 goto free_cpls;
1233
1234         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1235                                         0, GFP_KERNEL);
1236         if (!csk->cpl_abort_rpl)
1237                 goto free_cpls;
1238         return 0;
1239
1240 free_cpls:
1241         cxgbi_sock_free_cpl_skbs(csk);
1242         return -ENOMEM;
1243 }
1244
1245 static inline void l2t_put(struct cxgbi_sock *csk)
1246 {
1247         if (csk->l2t) {
1248                 cxgb4_l2t_release(csk->l2t);
1249                 csk->l2t = NULL;
1250                 cxgbi_sock_put(csk);
1251         }
1252 }
1253
1254 static void release_offload_resources(struct cxgbi_sock *csk)
1255 {
1256         struct cxgb4_lld_info *lldi;
1257
1258         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1259                 "csk 0x%p,%u,0x%lx,%u.\n",
1260                 csk, csk->state, csk->flags, csk->tid);
1261
1262         cxgbi_sock_free_cpl_skbs(csk);
1263         if (csk->wr_cred != csk->wr_max_cred) {
1264                 cxgbi_sock_purge_wr_queue(csk);
1265                 cxgbi_sock_reset_wr_list(csk);
1266         }
1267
1268         l2t_put(csk);
1269         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1270                 free_atid(csk);
1271         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1272                 lldi = cxgbi_cdev_priv(csk->cdev);
1273                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1274                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1275                 cxgbi_sock_put(csk);
1276         }
1277         csk->dst = NULL;
1278         csk->cdev = NULL;
1279 }
1280
1281 static int init_act_open(struct cxgbi_sock *csk)
1282 {
1283         struct cxgbi_device *cdev = csk->cdev;
1284         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1285         struct net_device *ndev = cdev->ports[csk->port_id];
1286         struct sk_buff *skb = NULL;
1287         struct neighbour *n = NULL;
1288         void *daddr;
1289         unsigned int step;
1290         unsigned int size, size6;
1291         int t4 = is_t4(lldi->adapter_type);
1292
1293         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1294                 "csk 0x%p,%u,0x%lx,%u.\n",
1295                 csk, csk->state, csk->flags, csk->tid);
1296
1297         if (csk->csk_family == AF_INET)
1298                 daddr = &csk->daddr.sin_addr.s_addr;
1299 #if IS_ENABLED(CONFIG_IPV6)
1300         else if (csk->csk_family == AF_INET6)
1301                 daddr = &csk->daddr6.sin6_addr;
1302 #endif
1303         else {
1304                 pr_err("address family 0x%x not supported\n", csk->csk_family);
1305                 goto rel_resource;
1306         }
1307
1308         n = dst_neigh_lookup(csk->dst, daddr);
1309
1310         if (!n) {
1311                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1312                 goto rel_resource;
1313         }
1314
1315         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1316         if (csk->atid < 0) {
1317                 pr_err("%s, NO atid available.\n", ndev->name);
1318                 return -EINVAL;
1319         }
1320         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1321         cxgbi_sock_get(csk);
1322
1323         csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1324         if (!csk->l2t) {
1325                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1326                 goto rel_resource;
1327         }
1328         cxgbi_sock_get(csk);
1329
1330         if (t4) {
1331                 size = sizeof(struct cpl_act_open_req);
1332                 size6 = sizeof(struct cpl_act_open_req6);
1333         } else {
1334                 size = sizeof(struct cpl_t5_act_open_req);
1335                 size6 = sizeof(struct cpl_t5_act_open_req6);
1336         }
1337
1338         if (csk->csk_family == AF_INET)
1339                 skb = alloc_wr(size, 0, GFP_NOIO);
1340 #if IS_ENABLED(CONFIG_IPV6)
1341         else
1342                 skb = alloc_wr(size6, 0, GFP_NOIO);
1343 #endif
1344
1345         if (!skb)
1346                 goto rel_resource;
1347         skb->sk = (struct sock *)csk;
1348         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1349
1350         if (!csk->mtu)
1351                 csk->mtu = dst_mtu(csk->dst);
1352         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1353         csk->tx_chan = cxgb4_port_chan(ndev);
1354         /* SMT two entries per row */
1355         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1356         step = lldi->ntxq / lldi->nchan;
1357         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1358         step = lldi->nrxq / lldi->nchan;
1359         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1360         csk->wr_cred = lldi->wr_cred -
1361                        DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1362         csk->wr_max_cred = csk->wr_cred;
1363         csk->wr_una_cred = 0;
1364         cxgbi_sock_reset_wr_list(csk);
1365         csk->err = 0;
1366
1367         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
1368                        (&csk->saddr), (&csk->daddr), csk, csk->state,
1369                        csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
1370                        csk->mtu, csk->mss_idx, csk->smac_idx);
1371
1372         /* must wait for either a act_open_rpl or act_open_establish */
1373         try_module_get(THIS_MODULE);
1374         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1375         if (csk->csk_family == AF_INET)
1376                 send_act_open_req(csk, skb, csk->l2t);
1377 #if IS_ENABLED(CONFIG_IPV6)
1378         else
1379                 send_act_open_req6(csk, skb, csk->l2t);
1380 #endif
1381         neigh_release(n);
1382
1383         return 0;
1384
1385 rel_resource:
1386         if (n)
1387                 neigh_release(n);
1388         if (skb)
1389                 __kfree_skb(skb);
1390         return -EINVAL;
1391 }
1392
1393 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1394         [CPL_ACT_ESTABLISH] = do_act_establish,
1395         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1396         [CPL_PEER_CLOSE] = do_peer_close,
1397         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1398         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1399         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1400         [CPL_FW4_ACK] = do_fw4_ack,
1401         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1402         [CPL_ISCSI_DATA] = do_rx_iscsi_hdr,
1403         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1404         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1405         [CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
1406 };
1407
1408 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1409 {
1410         int rc;
1411
1412         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1413                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1414
1415         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1416                                         cxgb4i_max_connect);
1417         if (rc < 0)
1418                 return rc;
1419
1420         cdev->csk_release_offload_resources = release_offload_resources;
1421         cdev->csk_push_tx_frames = push_tx_frames;
1422         cdev->csk_send_abort_req = send_abort_req;
1423         cdev->csk_send_close_req = send_close_req;
1424         cdev->csk_send_rx_credits = send_rx_credits;
1425         cdev->csk_alloc_cpls = alloc_cpls;
1426         cdev->csk_init_act_open = init_act_open;
1427
1428         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1429         return 0;
1430 }
1431
1432 /*
1433  * functions to program the pagepod in h/w
1434  */
1435 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1436 static inline void ulp_mem_io_set_hdr(struct cxgb4_lld_info *lldi,
1437                                 struct ulp_mem_io *req,
1438                                 unsigned int wr_len, unsigned int dlen,
1439                                 unsigned int pm_addr)
1440 {
1441         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1442
1443         INIT_ULPTX_WR(req, wr_len, 0, 0);
1444         if (is_t4(lldi->adapter_type))
1445                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1446                                         (ULP_MEMIO_ORDER(1)));
1447         else
1448                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1449                                         (V_T5_ULP_MEMIO_IMM(1)));
1450         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1451         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1452         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1453
1454         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1455         idata->len = htonl(dlen);
1456 }
1457
1458 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1459                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1460                                 unsigned int npods,
1461                                 struct cxgbi_gather_list *gl,
1462                                 unsigned int gl_pidx)
1463 {
1464         struct cxgbi_ddp_info *ddp = cdev->ddp;
1465         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1466         struct sk_buff *skb;
1467         struct ulp_mem_io *req;
1468         struct ulptx_idata *idata;
1469         struct cxgbi_pagepod *ppod;
1470         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1471         unsigned int dlen = PPOD_SIZE * npods;
1472         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1473                                 sizeof(struct ulptx_idata) + dlen, 16);
1474         unsigned int i;
1475
1476         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1477         if (!skb) {
1478                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1479                         cdev, idx, npods);
1480                 return -ENOMEM;
1481         }
1482         req = (struct ulp_mem_io *)skb->head;
1483         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1484
1485         ulp_mem_io_set_hdr(lldi, req, wr_len, dlen, pm_addr);
1486         idata = (struct ulptx_idata *)(req + 1);
1487         ppod = (struct cxgbi_pagepod *)(idata + 1);
1488
1489         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1490                 if (!hdr && !gl)
1491                         cxgbi_ddp_ppod_clear(ppod);
1492                 else
1493                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1494         }
1495
1496         cxgb4_ofld_send(cdev->ports[port_id], skb);
1497         return 0;
1498 }
1499
1500 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1501                         unsigned int idx, unsigned int npods,
1502                         struct cxgbi_gather_list *gl)
1503 {
1504         unsigned int i, cnt;
1505         int err = 0;
1506
1507         for (i = 0; i < npods; i += cnt, idx += cnt) {
1508                 cnt = npods - i;
1509                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1510                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1511                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1512                                         idx, cnt, gl, 4 * i);
1513                 if (err < 0)
1514                         break;
1515         }
1516         return err;
1517 }
1518
1519 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1520                           unsigned int idx, unsigned int npods)
1521 {
1522         unsigned int i, cnt;
1523         int err;
1524
1525         for (i = 0; i < npods; i += cnt, idx += cnt) {
1526                 cnt = npods - i;
1527                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1528                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1529                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1530                                         idx, cnt, NULL, 0);
1531                 if (err < 0)
1532                         break;
1533         }
1534 }
1535
1536 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1537                                 int pg_idx, bool reply)
1538 {
1539         struct sk_buff *skb;
1540         struct cpl_set_tcb_field *req;
1541
1542         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1543                 return 0;
1544
1545         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1546         if (!skb)
1547                 return -ENOMEM;
1548
1549         /*  set up ulp page size */
1550         req = (struct cpl_set_tcb_field *)skb->head;
1551         INIT_TP_WR(req, csk->tid);
1552         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1553         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1554         req->word_cookie = htons(0);
1555         req->mask = cpu_to_be64(0x3 << 8);
1556         req->val = cpu_to_be64(pg_idx << 8);
1557         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1558
1559         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1560                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1561
1562         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1563         return 0;
1564 }
1565
1566 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1567                                  int hcrc, int dcrc, int reply)
1568 {
1569         struct sk_buff *skb;
1570         struct cpl_set_tcb_field *req;
1571
1572         if (!hcrc && !dcrc)
1573                 return 0;
1574
1575         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1576         if (!skb)
1577                 return -ENOMEM;
1578
1579         csk->hcrc_len = (hcrc ? 4 : 0);
1580         csk->dcrc_len = (dcrc ? 4 : 0);
1581         /*  set up ulp submode */
1582         req = (struct cpl_set_tcb_field *)skb->head;
1583         INIT_TP_WR(req, tid);
1584         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1585         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1586         req->word_cookie = htons(0);
1587         req->mask = cpu_to_be64(0x3 << 4);
1588         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1589                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1590         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1591
1592         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1593                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1594
1595         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1596         return 0;
1597 }
1598
1599 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1600 {
1601         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1602         struct cxgbi_ddp_info *ddp = cdev->ddp;
1603         unsigned int tagmask, pgsz_factor[4];
1604         int err;
1605
1606         if (ddp) {
1607                 kref_get(&ddp->refcnt);
1608                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1609                         cdev, cdev->ddp);
1610                 return -EALREADY;
1611         }
1612
1613         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1614                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1615                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1616         if (err < 0)
1617                 return err;
1618
1619         ddp = cdev->ddp;
1620
1621         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1622         cxgbi_ddp_page_size_factor(pgsz_factor);
1623         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1624
1625         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1626         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1627         cdev->csk_ddp_set = ddp_set_map;
1628         cdev->csk_ddp_clear = ddp_clear_map;
1629
1630         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1631                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1632                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1633         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1634                 " %u/%u.\n",
1635                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1636                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1637                 ddp->max_rxsz, lldi->iscsi_iolen);
1638         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1639                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1640                 ddp->max_rxsz);
1641         return 0;
1642 }
1643
1644 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1645 {
1646         struct cxgbi_device *cdev;
1647         struct port_info *pi;
1648         int i, rc;
1649
1650         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1651         if (!cdev) {
1652                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1653                 return NULL;
1654         }
1655         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1656                 cdev, lldi->adapter_type, lldi->nports,
1657                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1658                 lldi->nrxq, lldi->wr_cred);
1659         for (i = 0; i < lldi->nrxq; i++)
1660                 log_debug(1 << CXGBI_DBG_DEV,
1661                         "t4 0x%p, rxq id #%d: %u.\n",
1662                         cdev, i, lldi->rxq_ids[i]);
1663
1664         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1665         cdev->flags = CXGBI_FLAG_DEV_T4;
1666         cdev->pdev = lldi->pdev;
1667         cdev->ports = lldi->ports;
1668         cdev->nports = lldi->nports;
1669         cdev->mtus = lldi->mtus;
1670         cdev->nmtus = NMTUS;
1671         cdev->snd_win = cxgb4i_snd_win;
1672         cdev->rcv_win = cxgb4i_rcv_win;
1673         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1674         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1675         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1676         cdev->itp = &cxgb4i_iscsi_transport;
1677
1678         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1679         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1680                 cdev, lldi->ports[0]->name, cdev->pfvf);
1681
1682         rc = cxgb4i_ddp_init(cdev);
1683         if (rc) {
1684                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1685                 goto err_out;
1686         }
1687         rc = cxgb4i_ofld_init(cdev);
1688         if (rc) {
1689                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1690                 goto err_out;
1691         }
1692
1693         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1694                                 &cxgb4i_host_template, cxgb4i_stt);
1695         if (rc)
1696                 goto err_out;
1697
1698         for (i = 0; i < cdev->nports; i++) {
1699                 pi = netdev_priv(lldi->ports[i]);
1700                 cdev->hbas[i]->port_id = pi->port_id;
1701         }
1702         return cdev;
1703
1704 err_out:
1705         cxgbi_device_unregister(cdev);
1706         return ERR_PTR(-ENOMEM);
1707 }
1708
1709 #define RX_PULL_LEN     128
1710 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1711                                 const struct pkt_gl *pgl)
1712 {
1713         const struct cpl_act_establish *rpl;
1714         struct sk_buff *skb;
1715         unsigned int opc;
1716         struct cxgbi_device *cdev = handle;
1717
1718         if (pgl == NULL) {
1719                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1720
1721                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1722                 if (!skb)
1723                         goto nomem;
1724                 skb_copy_to_linear_data(skb, &rsp[1], len);
1725         } else {
1726                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1727                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1728                                 pgl->va, be64_to_cpu(*rsp),
1729                                 be64_to_cpu(*(u64 *)pgl->va),
1730                                 pgl->tot_len);
1731                         return 0;
1732                 }
1733                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1734                 if (unlikely(!skb))
1735                         goto nomem;
1736         }
1737
1738         rpl = (struct cpl_act_establish *)skb->data;
1739         opc = rpl->ot.opcode;
1740         log_debug(1 << CXGBI_DBG_TOE,
1741                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1742                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1743         if (cxgb4i_cplhandlers[opc])
1744                 cxgb4i_cplhandlers[opc](cdev, skb);
1745         else {
1746                 pr_err("No handler for opcode 0x%x.\n", opc);
1747                 __kfree_skb(skb);
1748         }
1749         return 0;
1750 nomem:
1751         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1752         return 1;
1753 }
1754
1755 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1756 {
1757         struct cxgbi_device *cdev = handle;
1758
1759         switch (state) {
1760         case CXGB4_STATE_UP:
1761                 pr_info("cdev 0x%p, UP.\n", cdev);
1762                 break;
1763         case CXGB4_STATE_START_RECOVERY:
1764                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1765                 /* close all connections */
1766                 break;
1767         case CXGB4_STATE_DOWN:
1768                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1769                 break;
1770         case CXGB4_STATE_DETACH:
1771                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1772                 cxgbi_device_unregister(cdev);
1773                 break;
1774         default:
1775                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1776                 break;
1777         }
1778         return 0;
1779 }
1780
1781 static int __init cxgb4i_init_module(void)
1782 {
1783         int rc;
1784
1785         printk(KERN_INFO "%s", version);
1786
1787         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1788         if (rc < 0)
1789                 return rc;
1790         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1791
1792         return 0;
1793 }
1794
1795 static void __exit cxgb4i_exit_module(void)
1796 {
1797         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1798         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1799         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1800 }
1801
1802 module_init(cxgb4i_init_module);
1803 module_exit(cxgb4i_exit_module);