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         module_put(THIS_MODULE);
 832
 833         if (status && status != CPL_ERR_TCAM_FULL &&
 834             status != CPL_ERR_CONN_EXIST &&
 835             status != CPL_ERR_ARP_MISS)
 836                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 837
 838         cxgbi_sock_get(csk);
 839         spin_lock_bh(&csk->lock);
 840
 841         if (status == CPL_ERR_CONN_EXIST &&
 842             csk->retry_timer.function != csk_act_open_retry_timer) {
 843                 csk->retry_timer.function = csk_act_open_retry_timer;
 844                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 845         } else
 846                 cxgbi_sock_fail_act_open(csk,
 847                                         act_open_rpl_status_to_errno(status));
 848
 849         spin_unlock_bh(&csk->lock);
 850         cxgbi_sock_put(csk);
 851 rel_skb:
 852         __kfree_skb(skb);
 853 }
 854
 855 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 856 {
 857         struct cxgbi_sock *csk;
 858         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 859         unsigned int tid = GET_TID(req);
 860         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 861         struct tid_info *t = lldi->tids;
 862
 863         csk = lookup_tid(t, tid);
 864         if (unlikely(!csk)) {
 865                 pr_err("can't find connection for tid %u.\n", tid);
 866                 goto rel_skb;
 867         }
 868         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 869                        (&csk->saddr), (&csk->daddr),
 870                        csk, csk->state, csk->flags, csk->tid);
 871         cxgbi_sock_rcv_peer_close(csk);
 872 rel_skb:
 873         __kfree_skb(skb);
 874 }
 875
 876 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 877 {
 878         struct cxgbi_sock *csk;
 879         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 880         unsigned int tid = GET_TID(rpl);
 881         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 882         struct tid_info *t = lldi->tids;
 883
 884         csk = lookup_tid(t, tid);
 885         if (unlikely(!csk)) {
 886                 pr_err("can't find connection for tid %u.\n", tid);
 887                 goto rel_skb;
 888         }
 889         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 890                        (&csk->saddr), (&csk->daddr),
 891                        csk, csk->state, csk->flags, csk->tid);
 892         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 893 rel_skb:
 894         __kfree_skb(skb);
 895 }
 896
 897 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 898                                                                 int *need_rst)
 899 {
 900         switch (abort_reason) {
 901         case CPL_ERR_BAD_SYN: /* fall through */
 902         case CPL_ERR_CONN_RESET:
 903                 return csk->state > CTP_ESTABLISHED ?
 904                         -EPIPE : -ECONNRESET;
 905         case CPL_ERR_XMIT_TIMEDOUT:
 906         case CPL_ERR_PERSIST_TIMEDOUT:
 907         case CPL_ERR_FINWAIT2_TIMEDOUT:
 908         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 909                 return -ETIMEDOUT;
 910         default:
 911                 return -EIO;
 912         }
 913 }
 914
 915 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 916 {
 917         struct cxgbi_sock *csk;
 918         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 919         unsigned int tid = GET_TID(req);
 920         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 921         struct tid_info *t = lldi->tids;
 922         int rst_status = CPL_ABORT_NO_RST;
 923
 924         csk = lookup_tid(t, tid);
 925         if (unlikely(!csk)) {
 926                 pr_err("can't find connection for tid %u.\n", tid);
 927                 goto rel_skb;
 928         }
 929
 930         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 931                        (&csk->saddr), (&csk->daddr),
 932                        csk, csk->state, csk->flags, csk->tid, req->status);
 933
 934         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 935             req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 936                 goto rel_skb;
 937
 938         cxgbi_sock_get(csk);
 939         spin_lock_bh(&csk->lock);
 940
 941         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 942
 943         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 944                 send_tx_flowc_wr(csk);
 945                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 946         }
 947
 948         cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 949         cxgbi_sock_set_state(csk, CTP_ABORTING);
 950
 951         send_abort_rpl(csk, rst_status);
 952
 953         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 954                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 955                 cxgbi_sock_closed(csk);
 956         }
 957
 958         spin_unlock_bh(&csk->lock);
 959         cxgbi_sock_put(csk);
 960 rel_skb:
 961         __kfree_skb(skb);
 962 }
 963
 964 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 965 {
 966         struct cxgbi_sock *csk;
 967         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
 968         unsigned int tid = GET_TID(rpl);
 969         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 970         struct tid_info *t = lldi->tids;
 971
 972         csk = lookup_tid(t, tid);
 973         if (!csk)
 974                 goto rel_skb;
 975
 976         if (csk)
 977                 pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 978                                (&csk->saddr), (&csk->daddr), csk,
 979                                csk->state, csk->flags, csk->tid, rpl->status);
 980
 981         if (rpl->status == CPL_ERR_ABORT_FAILED)
 982                 goto rel_skb;
 983
 984         cxgbi_sock_rcv_abort_rpl(csk);
 985 rel_skb:
 986         __kfree_skb(skb);
 987 }
 988
 989 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
 990 {
 991         struct cxgbi_sock *csk;
 992         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
 993         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
 994         unsigned int tid = GET_TID(cpl);
 995         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 996         struct tid_info *t = lldi->tids;
 997
 998         csk = lookup_tid(t, tid);
 999         if (unlikely(!csk)) {
1000                 pr_err("can't find conn. for tid %u.\n", tid);
1001                 goto rel_skb;
1002         }
1003
1004         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1005                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
1006                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
1007                 pdu_len_ddp);
1008
1009         spin_lock_bh(&csk->lock);
1010
1011         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1012                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1013                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1014                         csk, csk->state, csk->flags, csk->tid);
1015                 if (csk->state != CTP_ABORTING)
1016                         goto abort_conn;
1017                 else
1018                         goto discard;
1019         }
1020
1021         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
1022         cxgbi_skcb_flags(skb) = 0;
1023
1024         skb_reset_transport_header(skb);
1025         __skb_pull(skb, sizeof(*cpl));
1026         __pskb_trim(skb, ntohs(cpl->len));
1027
1028         if (!csk->skb_ulp_lhdr) {
1029                 unsigned char *bhs;
1030                 unsigned int hlen, dlen, plen;
1031
1032                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1033                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
1034                         csk, csk->state, csk->flags, csk->tid, skb);
1035                 csk->skb_ulp_lhdr = skb;
1036                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
1037
1038                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
1039                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
1040                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
1041                                 csk->rcv_nxt);
1042                         goto abort_conn;
1043                 }
1044
1045                 bhs = skb->data;
1046                 hlen = ntohs(cpl->len);
1047                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
1048
1049                 plen = ISCSI_PDU_LEN(pdu_len_ddp);
1050                 if (is_t4(lldi->adapter_type))
1051                         plen -= 40;
1052
1053                 if ((hlen + dlen) != plen) {
1054                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
1055                                 "mismatch %u != %u + %u, seq 0x%x.\n",
1056                                 csk->tid, plen, hlen, dlen,
1057                                 cxgbi_skcb_tcp_seq(skb));
1058                         goto abort_conn;
1059                 }
1060
1061                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
1062                 if (dlen)
1063                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
1064                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
1065
1066                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1067                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
1068                         csk, skb, *bhs, hlen, dlen,
1069                         ntohl(*((unsigned int *)(bhs + 16))),
1070                         ntohl(*((unsigned int *)(bhs + 24))));
1071
1072         } else {
1073                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
1074
1075                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
1076                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1077                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1078                         csk, csk->state, csk->flags, skb, lskb);
1079         }
1080
1081         __skb_queue_tail(&csk->receive_queue, skb);
1082         spin_unlock_bh(&csk->lock);
1083         return;
1084
1085 abort_conn:
1086         send_abort_req(csk);
1087 discard:
1088         spin_unlock_bh(&csk->lock);
1089 rel_skb:
1090         __kfree_skb(skb);
1091 }
1092
1093 static void do_rx_data_ddp(struct cxgbi_device *cdev,
1094                                   struct sk_buff *skb)
1095 {
1096         struct cxgbi_sock *csk;
1097         struct sk_buff *lskb;
1098         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
1099         unsigned int tid = GET_TID(rpl);
1100         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1101         struct tid_info *t = lldi->tids;
1102         unsigned int status = ntohl(rpl->ddpvld);
1103
1104         csk = lookup_tid(t, tid);
1105         if (unlikely(!csk)) {
1106                 pr_err("can't find connection for tid %u.\n", tid);
1107                 goto rel_skb;
1108         }
1109
1110         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1111                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
1112                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
1113
1114         spin_lock_bh(&csk->lock);
1115
1116         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1117                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1118                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1119                         csk, csk->state, csk->flags, csk->tid);
1120                 if (csk->state != CTP_ABORTING)
1121                         goto abort_conn;
1122                 else
1123                         goto discard;
1124         }
1125
1126         if (!csk->skb_ulp_lhdr) {
1127                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
1128                 goto abort_conn;
1129         }
1130
1131         lskb = csk->skb_ulp_lhdr;
1132         csk->skb_ulp_lhdr = NULL;
1133
1134         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
1135
1136         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
1137                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
1138                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
1139
1140         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
1141                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1142                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1143                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
1144         }
1145         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1146                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1147                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1148                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1149         }
1150         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1151                 log_debug(1 << CXGBI_DBG_PDU_RX,
1152                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1153                         csk, lskb, status);
1154                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1155         }
1156         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1157                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1158                 log_debug(1 << CXGBI_DBG_PDU_RX,
1159                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1160                         csk, lskb, status);
1161                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1162         }
1163         log_debug(1 << CXGBI_DBG_PDU_RX,
1164                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1165                 csk, lskb, cxgbi_skcb_flags(lskb));
1166
1167         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1168         cxgbi_conn_pdu_ready(csk);
1169         spin_unlock_bh(&csk->lock);
1170         goto rel_skb;
1171
1172 abort_conn:
1173         send_abort_req(csk);
1174 discard:
1175         spin_unlock_bh(&csk->lock);
1176 rel_skb:
1177         __kfree_skb(skb);
1178 }
1179
1180 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1181 {
1182         struct cxgbi_sock *csk;
1183         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1184         unsigned int tid = GET_TID(rpl);
1185         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1186         struct tid_info *t = lldi->tids;
1187
1188         csk = lookup_tid(t, tid);
1189         if (unlikely(!csk))
1190                 pr_err("can't find connection for tid %u.\n", tid);
1191         else {
1192                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1193                         "csk 0x%p,%u,0x%lx,%u.\n",
1194                         csk, csk->state, csk->flags, csk->tid);
1195                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1196                                         rpl->seq_vld);
1197         }
1198         __kfree_skb(skb);
1199 }
1200
1201 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1202 {
1203         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1204         unsigned int tid = GET_TID(rpl);
1205         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1206         struct tid_info *t = lldi->tids;
1207         struct cxgbi_sock *csk;
1208
1209         csk = lookup_tid(t, tid);
1210         if (!csk)
1211                 pr_err("can't find conn. for tid %u.\n", tid);
1212
1213         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1214                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1215                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1216
1217         if (rpl->status != CPL_ERR_NONE)
1218                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1219                         csk, tid, rpl->status);
1220
1221         __kfree_skb(skb);
1222 }
1223
1224 static int alloc_cpls(struct cxgbi_sock *csk)
1225 {
1226         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1227                                         0, GFP_KERNEL);
1228         if (!csk->cpl_close)
1229                 return -ENOMEM;
1230
1231         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1232                                         0, GFP_KERNEL);
1233         if (!csk->cpl_abort_req)
1234                 goto free_cpls;
1235
1236         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1237                                         0, GFP_KERNEL);
1238         if (!csk->cpl_abort_rpl)
1239                 goto free_cpls;
1240         return 0;
1241
1242 free_cpls:
1243         cxgbi_sock_free_cpl_skbs(csk);
1244         return -ENOMEM;
1245 }
1246
1247 static inline void l2t_put(struct cxgbi_sock *csk)
1248 {
1249         if (csk->l2t) {
1250                 cxgb4_l2t_release(csk->l2t);
1251                 csk->l2t = NULL;
1252                 cxgbi_sock_put(csk);
1253         }
1254 }
1255
1256 static void release_offload_resources(struct cxgbi_sock *csk)
1257 {
1258         struct cxgb4_lld_info *lldi;
1259
1260         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1261                 "csk 0x%p,%u,0x%lx,%u.\n",
1262                 csk, csk->state, csk->flags, csk->tid);
1263
1264         cxgbi_sock_free_cpl_skbs(csk);
1265         if (csk->wr_cred != csk->wr_max_cred) {
1266                 cxgbi_sock_purge_wr_queue(csk);
1267                 cxgbi_sock_reset_wr_list(csk);
1268         }
1269
1270         l2t_put(csk);
1271         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1272                 free_atid(csk);
1273         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1274                 lldi = cxgbi_cdev_priv(csk->cdev);
1275                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1276                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1277                 cxgbi_sock_put(csk);
1278         }
1279         csk->dst = NULL;
1280         csk->cdev = NULL;
1281 }
1282
1283 static int init_act_open(struct cxgbi_sock *csk)
1284 {
1285         struct cxgbi_device *cdev = csk->cdev;
1286         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1287         struct net_device *ndev = cdev->ports[csk->port_id];
1288         struct sk_buff *skb = NULL;
1289         struct neighbour *n = NULL;
1290         void *daddr;
1291         unsigned int step;
1292         unsigned int size, size6;
1293         int t4 = is_t4(lldi->adapter_type);
1294
1295         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1296                 "csk 0x%p,%u,0x%lx,%u.\n",
1297                 csk, csk->state, csk->flags, csk->tid);
1298
1299         if (csk->csk_family == AF_INET)
1300                 daddr = &csk->daddr.sin_addr.s_addr;
1301 #if IS_ENABLED(CONFIG_IPV6)
1302         else if (csk->csk_family == AF_INET6)
1303                 daddr = &csk->daddr6.sin6_addr;
1304 #endif
1305         else {
1306                 pr_err("address family 0x%x not supported\n", csk->csk_family);
1307                 goto rel_resource;
1308         }
1309
1310         n = dst_neigh_lookup(csk->dst, daddr);
1311
1312         if (!n) {
1313                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1314                 goto rel_resource;
1315         }
1316
1317         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1318         if (csk->atid < 0) {
1319                 pr_err("%s, NO atid available.\n", ndev->name);
1320                 return -EINVAL;
1321         }
1322         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1323         cxgbi_sock_get(csk);
1324
1325         csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1326         if (!csk->l2t) {
1327                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1328                 goto rel_resource;
1329         }
1330         cxgbi_sock_get(csk);
1331
1332         if (t4) {
1333                 size = sizeof(struct cpl_act_open_req);
1334                 size6 = sizeof(struct cpl_act_open_req6);
1335         } else {
1336                 size = sizeof(struct cpl_t5_act_open_req);
1337                 size6 = sizeof(struct cpl_t5_act_open_req6);
1338         }
1339
1340         if (csk->csk_family == AF_INET)
1341                 skb = alloc_wr(size, 0, GFP_NOIO);
1342 #if IS_ENABLED(CONFIG_IPV6)
1343         else
1344                 skb = alloc_wr(size6, 0, GFP_NOIO);
1345 #endif
1346
1347         if (!skb)
1348                 goto rel_resource;
1349         skb->sk = (struct sock *)csk;
1350         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1351
1352         if (!csk->mtu)
1353                 csk->mtu = dst_mtu(csk->dst);
1354         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1355         csk->tx_chan = cxgb4_port_chan(ndev);
1356         /* SMT two entries per row */
1357         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1358         step = lldi->ntxq / lldi->nchan;
1359         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1360         step = lldi->nrxq / lldi->nchan;
1361         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1362         csk->wr_cred = lldi->wr_cred -
1363                        DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1364         csk->wr_max_cred = csk->wr_cred;
1365         csk->wr_una_cred = 0;
1366         cxgbi_sock_reset_wr_list(csk);
1367         csk->err = 0;
1368
1369         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
1370                        (&csk->saddr), (&csk->daddr), csk, csk->state,
1371                        csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
1372                        csk->mtu, csk->mss_idx, csk->smac_idx);
1373
1374         /* must wait for either a act_open_rpl or act_open_establish */
1375         try_module_get(THIS_MODULE);
1376         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1377         if (csk->csk_family == AF_INET)
1378                 send_act_open_req(csk, skb, csk->l2t);
1379 #if IS_ENABLED(CONFIG_IPV6)
1380         else
1381                 send_act_open_req6(csk, skb, csk->l2t);
1382 #endif
1383         neigh_release(n);
1384
1385         return 0;
1386
1387 rel_resource:
1388         if (n)
1389                 neigh_release(n);
1390         if (skb)
1391                 __kfree_skb(skb);
1392         return -EINVAL;
1393 }
1394
1395 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1396         [CPL_ACT_ESTABLISH] = do_act_establish,
1397         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1398         [CPL_PEER_CLOSE] = do_peer_close,
1399         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1400         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1401         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1402         [CPL_FW4_ACK] = do_fw4_ack,
1403         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1404         [CPL_ISCSI_DATA] = do_rx_iscsi_hdr,
1405         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1406         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1407         [CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
1408 };
1409
1410 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1411 {
1412         int rc;
1413
1414         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1415                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1416
1417         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1418                                         cxgb4i_max_connect);
1419         if (rc < 0)
1420                 return rc;
1421
1422         cdev->csk_release_offload_resources = release_offload_resources;
1423         cdev->csk_push_tx_frames = push_tx_frames;
1424         cdev->csk_send_abort_req = send_abort_req;
1425         cdev->csk_send_close_req = send_close_req;
1426         cdev->csk_send_rx_credits = send_rx_credits;
1427         cdev->csk_alloc_cpls = alloc_cpls;
1428         cdev->csk_init_act_open = init_act_open;
1429
1430         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1431         return 0;
1432 }
1433
1434 /*
1435  * functions to program the pagepod in h/w
1436  */
1437 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1438 static inline void ulp_mem_io_set_hdr(struct cxgb4_lld_info *lldi,
1439                                 struct ulp_mem_io *req,
1440                                 unsigned int wr_len, unsigned int dlen,
1441                                 unsigned int pm_addr)
1442 {
1443         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1444
1445         INIT_ULPTX_WR(req, wr_len, 0, 0);
1446         if (is_t4(lldi->adapter_type))
1447                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1448                                         (ULP_MEMIO_ORDER(1)));
1449         else
1450                 req->cmd = htonl(ULPTX_CMD(ULP_TX_MEM_WRITE) |
1451                                         (V_T5_ULP_MEMIO_IMM(1)));
1452         req->dlen = htonl(ULP_MEMIO_DATA_LEN(dlen >> 5));
1453         req->lock_addr = htonl(ULP_MEMIO_ADDR(pm_addr >> 5));
1454         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1455
1456         idata->cmd_more = htonl(ULPTX_CMD(ULP_TX_SC_IMM));
1457         idata->len = htonl(dlen);
1458 }
1459
1460 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1461                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1462                                 unsigned int npods,
1463                                 struct cxgbi_gather_list *gl,
1464                                 unsigned int gl_pidx)
1465 {
1466         struct cxgbi_ddp_info *ddp = cdev->ddp;
1467         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1468         struct sk_buff *skb;
1469         struct ulp_mem_io *req;
1470         struct ulptx_idata *idata;
1471         struct cxgbi_pagepod *ppod;
1472         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1473         unsigned int dlen = PPOD_SIZE * npods;
1474         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1475                                 sizeof(struct ulptx_idata) + dlen, 16);
1476         unsigned int i;
1477
1478         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1479         if (!skb) {
1480                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1481                         cdev, idx, npods);
1482                 return -ENOMEM;
1483         }
1484         req = (struct ulp_mem_io *)skb->head;
1485         set_queue(skb, CPL_PRIORITY_CONTROL, NULL);
1486
1487         ulp_mem_io_set_hdr(lldi, req, wr_len, dlen, pm_addr);
1488         idata = (struct ulptx_idata *)(req + 1);
1489         ppod = (struct cxgbi_pagepod *)(idata + 1);
1490
1491         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1492                 if (!hdr && !gl)
1493                         cxgbi_ddp_ppod_clear(ppod);
1494                 else
1495                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1496         }
1497
1498         cxgb4_ofld_send(cdev->ports[port_id], skb);
1499         return 0;
1500 }
1501
1502 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1503                         unsigned int idx, unsigned int npods,
1504                         struct cxgbi_gather_list *gl)
1505 {
1506         unsigned int i, cnt;
1507         int err = 0;
1508
1509         for (i = 0; i < npods; i += cnt, idx += cnt) {
1510                 cnt = npods - i;
1511                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1512                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1513                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1514                                         idx, cnt, gl, 4 * i);
1515                 if (err < 0)
1516                         break;
1517         }
1518         return err;
1519 }
1520
1521 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1522                           unsigned int idx, unsigned int npods)
1523 {
1524         unsigned int i, cnt;
1525         int err;
1526
1527         for (i = 0; i < npods; i += cnt, idx += cnt) {
1528                 cnt = npods - i;
1529                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1530                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1531                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1532                                         idx, cnt, NULL, 0);
1533                 if (err < 0)
1534                         break;
1535         }
1536 }
1537
1538 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1539                                 int pg_idx, bool reply)
1540 {
1541         struct sk_buff *skb;
1542         struct cpl_set_tcb_field *req;
1543
1544         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1545                 return 0;
1546
1547         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1548         if (!skb)
1549                 return -ENOMEM;
1550
1551         /*  set up ulp page size */
1552         req = (struct cpl_set_tcb_field *)skb->head;
1553         INIT_TP_WR(req, csk->tid);
1554         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1555         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1556         req->word_cookie = htons(0);
1557         req->mask = cpu_to_be64(0x3 << 8);
1558         req->val = cpu_to_be64(pg_idx << 8);
1559         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1560
1561         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1562                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1563
1564         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1565         return 0;
1566 }
1567
1568 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1569                                  int hcrc, int dcrc, int reply)
1570 {
1571         struct sk_buff *skb;
1572         struct cpl_set_tcb_field *req;
1573
1574         if (!hcrc && !dcrc)
1575                 return 0;
1576
1577         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1578         if (!skb)
1579                 return -ENOMEM;
1580
1581         csk->hcrc_len = (hcrc ? 4 : 0);
1582         csk->dcrc_len = (dcrc ? 4 : 0);
1583         /*  set up ulp submode */
1584         req = (struct cpl_set_tcb_field *)skb->head;
1585         INIT_TP_WR(req, tid);
1586         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1587         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1588         req->word_cookie = htons(0);
1589         req->mask = cpu_to_be64(0x3 << 4);
1590         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1591                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1592         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1593
1594         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1595                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1596
1597         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1598         return 0;
1599 }
1600
1601 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1602 {
1603         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1604         struct cxgbi_ddp_info *ddp = cdev->ddp;
1605         unsigned int tagmask, pgsz_factor[4];
1606         int err;
1607
1608         if (ddp) {
1609                 kref_get(&ddp->refcnt);
1610                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1611                         cdev, cdev->ddp);
1612                 return -EALREADY;
1613         }
1614
1615         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1616                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1617                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1618         if (err < 0)
1619                 return err;
1620
1621         ddp = cdev->ddp;
1622
1623         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1624         cxgbi_ddp_page_size_factor(pgsz_factor);
1625         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1626
1627         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1628         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1629         cdev->csk_ddp_set = ddp_set_map;
1630         cdev->csk_ddp_clear = ddp_clear_map;
1631
1632         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1633                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1634                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1635         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1636                 " %u/%u.\n",
1637                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1638                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1639                 ddp->max_rxsz, lldi->iscsi_iolen);
1640         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1641                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1642                 ddp->max_rxsz);
1643         return 0;
1644 }
1645
1646 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1647 {
1648         struct cxgbi_device *cdev;
1649         struct port_info *pi;
1650         int i, rc;
1651
1652         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1653         if (!cdev) {
1654                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1655                 return NULL;
1656         }
1657         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1658                 cdev, lldi->adapter_type, lldi->nports,
1659                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1660                 lldi->nrxq, lldi->wr_cred);
1661         for (i = 0; i < lldi->nrxq; i++)
1662                 log_debug(1 << CXGBI_DBG_DEV,
1663                         "t4 0x%p, rxq id #%d: %u.\n",
1664                         cdev, i, lldi->rxq_ids[i]);
1665
1666         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1667         cdev->flags = CXGBI_FLAG_DEV_T4;
1668         cdev->pdev = lldi->pdev;
1669         cdev->ports = lldi->ports;
1670         cdev->nports = lldi->nports;
1671         cdev->mtus = lldi->mtus;
1672         cdev->nmtus = NMTUS;
1673         cdev->snd_win = cxgb4i_snd_win;
1674         cdev->rcv_win = cxgb4i_rcv_win;
1675         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1676         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1677         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1678         cdev->itp = &cxgb4i_iscsi_transport;
1679
1680         cdev->pfvf = FW_VIID_PFN_GET(cxgb4_port_viid(lldi->ports[0])) << 8;
1681         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1682                 cdev, lldi->ports[0]->name, cdev->pfvf);
1683
1684         rc = cxgb4i_ddp_init(cdev);
1685         if (rc) {
1686                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1687                 goto err_out;
1688         }
1689         rc = cxgb4i_ofld_init(cdev);
1690         if (rc) {
1691                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1692                 goto err_out;
1693         }
1694
1695         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1696                                 &cxgb4i_host_template, cxgb4i_stt);
1697         if (rc)
1698                 goto err_out;
1699
1700         for (i = 0; i < cdev->nports; i++) {
1701                 pi = netdev_priv(lldi->ports[i]);
1702                 cdev->hbas[i]->port_id = pi->port_id;
1703         }
1704         return cdev;
1705
1706 err_out:
1707         cxgbi_device_unregister(cdev);
1708         return ERR_PTR(-ENOMEM);
1709 }
1710
1711 #define RX_PULL_LEN     128
1712 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1713                                 const struct pkt_gl *pgl)
1714 {
1715         const struct cpl_act_establish *rpl;
1716         struct sk_buff *skb;
1717         unsigned int opc;
1718         struct cxgbi_device *cdev = handle;
1719
1720         if (pgl == NULL) {
1721                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1722
1723                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1724                 if (!skb)
1725                         goto nomem;
1726                 skb_copy_to_linear_data(skb, &rsp[1], len);
1727         } else {
1728                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1729                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1730                                 pgl->va, be64_to_cpu(*rsp),
1731                                 be64_to_cpu(*(u64 *)pgl->va),
1732                                 pgl->tot_len);
1733                         return 0;
1734                 }
1735                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1736                 if (unlikely(!skb))
1737                         goto nomem;
1738         }
1739
1740         rpl = (struct cpl_act_establish *)skb->data;
1741         opc = rpl->ot.opcode;
1742         log_debug(1 << CXGBI_DBG_TOE,
1743                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1744                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1745         if (cxgb4i_cplhandlers[opc])
1746                 cxgb4i_cplhandlers[opc](cdev, skb);
1747         else {
1748                 pr_err("No handler for opcode 0x%x.\n", opc);
1749                 __kfree_skb(skb);
1750         }
1751         return 0;
1752 nomem:
1753         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1754         return 1;
1755 }
1756
1757 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1758 {
1759         struct cxgbi_device *cdev = handle;
1760
1761         switch (state) {
1762         case CXGB4_STATE_UP:
1763                 pr_info("cdev 0x%p, UP.\n", cdev);
1764                 break;
1765         case CXGB4_STATE_START_RECOVERY:
1766                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1767                 /* close all connections */
1768                 break;
1769         case CXGB4_STATE_DOWN:
1770                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1771                 break;
1772         case CXGB4_STATE_DETACH:
1773                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1774                 cxgbi_device_unregister(cdev);
1775                 break;
1776         default:
1777                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1778                 break;
1779         }
1780         return 0;
1781 }
1782
1783 static int __init cxgb4i_init_module(void)
1784 {
1785         int rc;
1786
1787         printk(KERN_INFO "%s", version);
1788
1789         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1790         if (rc < 0)
1791                 return rc;
1792         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1793
1794         return 0;
1795 }
1796
1797 static void __exit cxgb4i_exit_module(void)
1798 {
1799         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1800         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1801         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1802 }
1803
1804 module_init(cxgb4i_init_module);
1805 module_exit(cxgb4i_exit_module);