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 static inline int send_tx_flowc_wr(struct cxgbi_sock *);
  79
  80 static const struct cxgb4_uld_info cxgb4i_uld_info = {
  81         .name = DRV_MODULE_NAME,
  82         .add = t4_uld_add,
  83         .rx_handler = t4_uld_rx_handler,
  84         .state_change = t4_uld_state_change,
  85 };
  86
  87 static struct scsi_host_template cxgb4i_host_template = {
  88         .module         = THIS_MODULE,
  89         .name           = DRV_MODULE_NAME,
  90         .proc_name      = DRV_MODULE_NAME,
  91         .can_queue      = CXGB4I_SCSI_HOST_QDEPTH,
  92         .queuecommand   = iscsi_queuecommand,
  93         .change_queue_depth = scsi_change_queue_depth,
  94         .sg_tablesize   = SG_ALL,
  95         .max_sectors    = 0xFFFF,
  96         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  97         .eh_abort_handler = iscsi_eh_abort,
  98         .eh_device_reset_handler = iscsi_eh_device_reset,
  99         .eh_target_reset_handler = iscsi_eh_recover_target,
 100         .target_alloc   = iscsi_target_alloc,
 101         .use_clustering = DISABLE_CLUSTERING,
 102         .this_id        = -1,
 103         .track_queue_depth = 1,
 104 };
 105
 106 static struct iscsi_transport cxgb4i_iscsi_transport = {
 107         .owner          = THIS_MODULE,
 108         .name           = DRV_MODULE_NAME,
 109         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
 110                                 CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 111                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 112         .attr_is_visible        = cxgbi_attr_is_visible,
 113         .get_host_param = cxgbi_get_host_param,
 114         .set_host_param = cxgbi_set_host_param,
 115         /* session management */
 116         .create_session = cxgbi_create_session,
 117         .destroy_session        = cxgbi_destroy_session,
 118         .get_session_param = iscsi_session_get_param,
 119         /* connection management */
 120         .create_conn    = cxgbi_create_conn,
 121         .bind_conn              = cxgbi_bind_conn,
 122         .destroy_conn   = iscsi_tcp_conn_teardown,
 123         .start_conn             = iscsi_conn_start,
 124         .stop_conn              = iscsi_conn_stop,
 125         .get_conn_param = iscsi_conn_get_param,
 126         .set_param      = cxgbi_set_conn_param,
 127         .get_stats      = cxgbi_get_conn_stats,
 128         /* pdu xmit req from user space */
 129         .send_pdu       = iscsi_conn_send_pdu,
 130         /* task */
 131         .init_task      = iscsi_tcp_task_init,
 132         .xmit_task      = iscsi_tcp_task_xmit,
 133         .cleanup_task   = cxgbi_cleanup_task,
 134         /* pdu */
 135         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 136         .init_pdu       = cxgbi_conn_init_pdu,
 137         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 138         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 139         /* TCP connect/disconnect */
 140         .get_ep_param   = cxgbi_get_ep_param,
 141         .ep_connect     = cxgbi_ep_connect,
 142         .ep_poll        = cxgbi_ep_poll,
 143         .ep_disconnect  = cxgbi_ep_disconnect,
 144         /* Error recovery timeout call */
 145         .session_recovery_timedout = iscsi_session_recovery_timedout,
 146 };
 147
 148 static struct scsi_transport_template *cxgb4i_stt;
 149
 150 /*
 151  * CPL (Chelsio Protocol Language) defines a message passing interface between
 152  * the host driver and Chelsio asic.
 153  * The section below implments CPLs that related to iscsi tcp connection
 154  * open/close/abort and data send/receive.
 155  */
 156
 157 #define DIV_ROUND_UP(n, d)      (((n) + (d) - 1) / (d))
 158 #define RCV_BUFSIZ_MASK         0x3FFU
 159 #define MAX_IMM_TX_PKT_LEN      128
 160
 161 static int push_tx_frames(struct cxgbi_sock *, int);
 162
 163 /*
 164  * is_ofld_imm - check whether a packet can be sent as immediate data
 165  * @skb: the packet
 166  *
 167  * Returns true if a packet can be sent as an offload WR with immediate
 168  * data.  We currently use the same limit as for Ethernet packets.
 169  */
 170 static inline bool is_ofld_imm(const struct sk_buff *skb)
 171 {
 172         int len = skb->len;
 173
 174         if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
 175                 len += sizeof(struct fw_ofld_tx_data_wr);
 176
 177         return len <= MAX_IMM_TX_PKT_LEN;
 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_F |
 192                 WND_SCALE_V(wscale) |
 193                 MSS_IDX_V(csk->mss_idx) |
 194                 L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
 195                 TX_CHAN_V(csk->tx_chan) |
 196                 SMAC_SEL_V(csk->smac_idx) |
 197                 ULP_MODE_V(ULP_MODE_ISCSI) |
 198                 RCV_BUFSIZ_V(cxgb4i_rcv_win >> 10);
 199         opt2 = RX_CHANNEL_V(0) |
 200                 RSS_QUEUE_VALID_F |
 201                 (RX_FC_DISABLE_F) |
 202                 RSS_QUEUE_V(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 |= RX_FC_VALID_F;
 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(FILTER_TUPLE_V(
 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_F |
 275                 WND_SCALE_V(wscale) |
 276                 MSS_IDX_V(csk->mss_idx) |
 277                 L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
 278                 TX_CHAN_V(csk->tx_chan) |
 279                 SMAC_SEL_V(csk->smac_idx) |
 280                 ULP_MODE_V(ULP_MODE_ISCSI) |
 281                 RCV_BUFSIZ_V(cxgb4i_rcv_win >> 10);
 282
 283         opt2 = RX_CHANNEL_V(0) |
 284                 RSS_QUEUE_VALID_F |
 285                 RX_FC_DISABLE_F |
 286                 RSS_QUEUE_V(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_F;
 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_F;
 331                 req->opt2 = cpu_to_be32(opt2);
 332
 333                 req->params = cpu_to_be64(FILTER_TUPLE_V(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
 391         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 392                 send_tx_flowc_wr(csk);
 393                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 394         }
 395
 396         cxgbi_sock_set_state(csk, CTP_ABORTING);
 397         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 398         cxgbi_sock_purge_write_queue(csk);
 399
 400         csk->cpl_abort_req = NULL;
 401         req = (struct cpl_abort_req *)skb->head;
 402         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 403         req->cmd = CPL_ABORT_SEND_RST;
 404         t4_set_arp_err_handler(skb, csk, abort_arp_failure);
 405         INIT_TP_WR(req, csk->tid);
 406         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 407         req->rsvd0 = htonl(csk->snd_nxt);
 408         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 409
 410         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 411                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 412                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 413                 req->rsvd1);
 414
 415         cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 416 }
 417
 418 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 419 {
 420         struct sk_buff *skb = csk->cpl_abort_rpl;
 421         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 422
 423         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 424                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 425                 csk, csk->state, csk->flags, csk->tid, rst_status);
 426
 427         csk->cpl_abort_rpl = NULL;
 428         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 429         INIT_TP_WR(rpl, csk->tid);
 430         OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 431         rpl->cmd = rst_status;
 432         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 433 }
 434
 435 /*
 436  * CPL connection rx data ack: host ->
 437  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 438  * credits sent.
 439  */
 440 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 441 {
 442         struct sk_buff *skb;
 443         struct cpl_rx_data_ack *req;
 444
 445         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 446                 "csk 0x%p,%u,0x%lx,%u, credit %u.\n",
 447                 csk, csk->state, csk->flags, csk->tid, credits);
 448
 449         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 450         if (!skb) {
 451                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 452                 return 0;
 453         }
 454         req = (struct cpl_rx_data_ack *)skb->head;
 455
 456         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
 457         INIT_TP_WR(req, csk->tid);
 458         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
 459                                       csk->tid));
 460         req->credit_dack = cpu_to_be32(RX_CREDITS_V(credits)
 461                                        | RX_FORCE_ACK_F);
 462         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 463         return credits;
 464 }
 465
 466 /*
 467  * sgl_len - calculates the size of an SGL of the given capacity
 468  * @n: the number of SGL entries
 469  * Calculates the number of flits needed for a scatter/gather list that
 470  * can hold the given number of entries.
 471  */
 472 static inline unsigned int sgl_len(unsigned int n)
 473 {
 474         n--;
 475         return (3 * n) / 2 + (n & 1) + 2;
 476 }
 477
 478 /*
 479  * calc_tx_flits_ofld - calculate # of flits for an offload packet
 480  * @skb: the packet
 481  *
 482  * Returns the number of flits needed for the given offload packet.
 483  * These packets are already fully constructed and no additional headers
 484  * will be added.
 485  */
 486 static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
 487 {
 488         unsigned int flits, cnt;
 489
 490         if (is_ofld_imm(skb))
 491                 return DIV_ROUND_UP(skb->len, 8);
 492         flits = skb_transport_offset(skb) / 8;
 493         cnt = skb_shinfo(skb)->nr_frags;
 494         if (skb_tail_pointer(skb) != skb_transport_header(skb))
 495                 cnt++;
 496         return flits + sgl_len(cnt);
 497 }
 498
 499 #define FLOWC_WR_NPARAMS_MIN    9
 500 static inline int tx_flowc_wr_credits(int *nparamsp, int *flowclenp)
 501 {
 502         int nparams, flowclen16, flowclen;
 503
 504         nparams = FLOWC_WR_NPARAMS_MIN;
 505         flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
 506         flowclen16 = DIV_ROUND_UP(flowclen, 16);
 507         flowclen = flowclen16 * 16;
 508         /*
 509          * Return the number of 16-byte credits used by the FlowC request.
 510          * Pass back the nparams and actual FlowC length if requested.
 511          */
 512         if (nparamsp)
 513                 *nparamsp = nparams;
 514         if (flowclenp)
 515                 *flowclenp = flowclen;
 516
 517         return flowclen16;
 518 }
 519
 520 static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
 521 {
 522         struct sk_buff *skb;
 523         struct fw_flowc_wr *flowc;
 524         int nparams, flowclen16, flowclen;
 525
 526         flowclen16 = tx_flowc_wr_credits(&nparams, &flowclen);
 527         skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
 528         flowc = (struct fw_flowc_wr *)skb->head;
 529         flowc->op_to_nparams =
 530                 htonl(FW_WR_OP_V(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS_V(nparams));
 531         flowc->flowid_len16 =
 532                 htonl(FW_WR_LEN16_V(flowclen16) | FW_WR_FLOWID_V(csk->tid));
 533         flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
 534         flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
 535         flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
 536         flowc->mnemval[1].val = htonl(csk->tx_chan);
 537         flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
 538         flowc->mnemval[2].val = htonl(csk->tx_chan);
 539         flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
 540         flowc->mnemval[3].val = htonl(csk->rss_qid);
 541         flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
 542         flowc->mnemval[4].val = htonl(csk->snd_nxt);
 543         flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
 544         flowc->mnemval[5].val = htonl(csk->rcv_nxt);
 545         flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
 546         flowc->mnemval[6].val = htonl(cxgb4i_snd_win);
 547         flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
 548         flowc->mnemval[7].val = htonl(csk->advmss);
 549         flowc->mnemval[8].mnemonic = 0;
 550         flowc->mnemval[8].val = 0;
 551         flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
 552         flowc->mnemval[8].val = 16384;
 553
 554         set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 555
 556         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 557                 "csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
 558                 csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
 559                 csk->snd_nxt, csk->rcv_nxt, cxgb4i_snd_win,
 560                 csk->advmss);
 561
 562         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
 563
 564         return flowclen16;
 565 }
 566
 567 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 568                                    int dlen, int len, u32 credits, int compl)
 569 {
 570         struct fw_ofld_tx_data_wr *req;
 571         unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
 572         unsigned int wr_ulp_mode = 0, val;
 573         bool imm = is_ofld_imm(skb);
 574
 575         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 576
 577         if (imm) {
 578                 req->op_to_immdlen = htonl(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
 579                                         FW_WR_COMPL_F |
 580                                         FW_WR_IMMDLEN_V(dlen));
 581                 req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
 582                                                 FW_WR_LEN16_V(credits));
 583         } else {
 584                 req->op_to_immdlen =
 585                         cpu_to_be32(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
 586                                         FW_WR_COMPL_F |
 587                                         FW_WR_IMMDLEN_V(0));
 588                 req->flowid_len16 =
 589                         cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
 590                                         FW_WR_LEN16_V(credits));
 591         }
 592         if (submode)
 593                 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP2_MODE_ISCSI) |
 594                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
 595         val = skb_peek(&csk->write_queue) ? 0 : 1;
 596         req->tunnel_to_proxy = htonl(wr_ulp_mode |
 597                                      FW_OFLD_TX_DATA_WR_SHOVE_V(val));
 598         req->plen = htonl(len);
 599         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
 600                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 601 }
 602
 603 static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 604 {
 605         kfree_skb(skb);
 606 }
 607
 608 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 609 {
 610         int total_size = 0;
 611         struct sk_buff *skb;
 612
 613         if (unlikely(csk->state < CTP_ESTABLISHED ||
 614                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 615                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
 616                          1 << CXGBI_DBG_PDU_TX,
 617                         "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 618                         csk, csk->state, csk->flags, csk->tid);
 619                 return 0;
 620         }
 621
 622         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 623                 int dlen = skb->len;
 624                 int len = skb->len;
 625                 unsigned int credits_needed;
 626                 int flowclen16 = 0;
 627
 628                 skb_reset_transport_header(skb);
 629                 if (is_ofld_imm(skb))
 630                         credits_needed = DIV_ROUND_UP(dlen, 16);
 631                 else
 632                         credits_needed = DIV_ROUND_UP(
 633                                                 8 * calc_tx_flits_ofld(skb),
 634                                                 16);
 635
 636                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
 637                         credits_needed += DIV_ROUND_UP(
 638                                         sizeof(struct fw_ofld_tx_data_wr),
 639                                         16);
 640
 641                 /*
 642                  * Assumes the initial credits is large enough to support
 643                  * fw_flowc_wr plus largest possible first payload
 644                  */
 645                 if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 646                         flowclen16 = send_tx_flowc_wr(csk);
 647                         csk->wr_cred -= flowclen16;
 648                         csk->wr_una_cred += flowclen16;
 649                         cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 650                 }
 651
 652                 if (csk->wr_cred < credits_needed) {
 653                         log_debug(1 << CXGBI_DBG_PDU_TX,
 654                                 "csk 0x%p, skb %u/%u, wr %d < %u.\n",
 655                                 csk, skb->len, skb->data_len,
 656                                 credits_needed, csk->wr_cred);
 657                         break;
 658                 }
 659                 __skb_unlink(skb, &csk->write_queue);
 660                 set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
 661                 skb->csum = credits_needed + flowclen16;
 662                 csk->wr_cred -= credits_needed;
 663                 csk->wr_una_cred += credits_needed;
 664                 cxgbi_sock_enqueue_wr(csk, skb);
 665
 666                 log_debug(1 << CXGBI_DBG_PDU_TX,
 667                         "csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 668                         csk, skb->len, skb->data_len, credits_needed,
 669                         csk->wr_cred, csk->wr_una_cred);
 670
 671                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 672                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 673                         make_tx_data_wr(csk, skb, dlen, len, credits_needed,
 674                                         req_completion);
 675                         csk->snd_nxt += len;
 676                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 677                 }
 678                 total_size += skb->truesize;
 679                 t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
 680
 681                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 682                         "csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
 683                         csk, csk->state, csk->flags, csk->tid, skb, len);
 684
 685                 cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
 686         }
 687         return total_size;
 688 }
 689
 690 static inline void free_atid(struct cxgbi_sock *csk)
 691 {
 692         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 693
 694         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 695                 cxgb4_free_atid(lldi->tids, csk->atid);
 696                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 697                 cxgbi_sock_put(csk);
 698         }
 699 }
 700
 701 static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
 702 {
 703         struct cxgbi_sock *csk;
 704         struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
 705         unsigned short tcp_opt = ntohs(req->tcp_opt);
 706         unsigned int tid = GET_TID(req);
 707         unsigned int atid = GET_TID_TID(ntohl(req->tos_atid));
 708         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 709         struct tid_info *t = lldi->tids;
 710         u32 rcv_isn = be32_to_cpu(req->rcv_isn);
 711
 712         csk = lookup_atid(t, atid);
 713         if (unlikely(!csk)) {
 714                 pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
 715                 goto rel_skb;
 716         }
 717
 718         if (csk->atid != atid) {
 719                 pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
 720                         atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
 721                 goto rel_skb;
 722         }
 723
 724         pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 725                        (&csk->saddr), (&csk->daddr),
 726                        atid, tid, csk, csk->state, csk->flags, rcv_isn);
 727
 728         module_put(THIS_MODULE);
 729
 730         cxgbi_sock_get(csk);
 731         csk->tid = tid;
 732         cxgb4_insert_tid(lldi->tids, csk, tid);
 733         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 734
 735         free_atid(csk);
 736
 737         spin_lock_bh(&csk->lock);
 738         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 739                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 740                         csk, csk->state, csk->flags, csk->tid);
 741
 742         if (csk->retry_timer.function) {
 743                 del_timer(&csk->retry_timer);
 744                 csk->retry_timer.function = NULL;
 745         }
 746
 747         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 748         /*
 749          * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
 750          * pass through opt0.
 751          */
 752         if (cxgb4i_rcv_win > (RCV_BUFSIZ_MASK << 10))
 753                 csk->rcv_wup -= cxgb4i_rcv_win - (RCV_BUFSIZ_MASK << 10);
 754
 755         csk->advmss = lldi->mtus[GET_TCPOPT_MSS(tcp_opt)] - 40;
 756         if (GET_TCPOPT_TSTAMP(tcp_opt))
 757                 csk->advmss -= 12;
 758         if (csk->advmss < 128)
 759                 csk->advmss = 128;
 760
 761         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 762                 "csk 0x%p, mss_idx %u, advmss %u.\n",
 763                         csk, GET_TCPOPT_MSS(tcp_opt), csk->advmss);
 764
 765         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 766
 767         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 768                 send_abort_req(csk);
 769         else {
 770                 if (skb_queue_len(&csk->write_queue))
 771                         push_tx_frames(csk, 0);
 772                 cxgbi_conn_tx_open(csk);
 773         }
 774         spin_unlock_bh(&csk->lock);
 775
 776 rel_skb:
 777         __kfree_skb(skb);
 778 }
 779
 780 static int act_open_rpl_status_to_errno(int status)
 781 {
 782         switch (status) {
 783         case CPL_ERR_CONN_RESET:
 784                 return -ECONNREFUSED;
 785         case CPL_ERR_ARP_MISS:
 786                 return -EHOSTUNREACH;
 787         case CPL_ERR_CONN_TIMEDOUT:
 788                 return -ETIMEDOUT;
 789         case CPL_ERR_TCAM_FULL:
 790                 return -ENOMEM;
 791         case CPL_ERR_CONN_EXIST:
 792                 return -EADDRINUSE;
 793         default:
 794                 return -EIO;
 795         }
 796 }
 797
 798 static void csk_act_open_retry_timer(unsigned long data)
 799 {
 800         struct sk_buff *skb = NULL;
 801         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 802         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
 803         void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
 804                                    struct l2t_entry *);
 805         int t4 = is_t4(lldi->adapter_type), size, size6;
 806
 807         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 808                 "csk 0x%p,%u,0x%lx,%u.\n",
 809                 csk, csk->state, csk->flags, csk->tid);
 810
 811         cxgbi_sock_get(csk);
 812         spin_lock_bh(&csk->lock);
 813
 814         if (t4) {
 815                 size = sizeof(struct cpl_act_open_req);
 816                 size6 = sizeof(struct cpl_act_open_req6);
 817         } else {
 818                 size = sizeof(struct cpl_t5_act_open_req);
 819                 size6 = sizeof(struct cpl_t5_act_open_req6);
 820         }
 821
 822         if (csk->csk_family == AF_INET) {
 823                 send_act_open_func = send_act_open_req;
 824                 skb = alloc_wr(size, 0, GFP_ATOMIC);
 825 #if IS_ENABLED(CONFIG_IPV6)
 826         } else {
 827                 send_act_open_func = send_act_open_req6;
 828                 skb = alloc_wr(size6, 0, GFP_ATOMIC);
 829 #endif
 830         }
 831
 832         if (!skb)
 833                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 834         else {
 835                 skb->sk = (struct sock *)csk;
 836                 t4_set_arp_err_handler(skb, csk,
 837                                        cxgbi_sock_act_open_req_arp_failure);
 838                 send_act_open_func(csk, skb, csk->l2t);
 839         }
 840
 841         spin_unlock_bh(&csk->lock);
 842         cxgbi_sock_put(csk);
 843
 844 }
 845
 846 static inline bool is_neg_adv(unsigned int status)
 847 {
 848         return status == CPL_ERR_RTX_NEG_ADVICE ||
 849                 status == CPL_ERR_KEEPALV_NEG_ADVICE ||
 850                 status == CPL_ERR_PERSIST_NEG_ADVICE;
 851 }
 852
 853 static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 854 {
 855         struct cxgbi_sock *csk;
 856         struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
 857         unsigned int tid = GET_TID(rpl);
 858         unsigned int atid =
 859                 GET_TID_TID(GET_AOPEN_ATID(be32_to_cpu(rpl->atid_status)));
 860         unsigned int status = GET_AOPEN_STATUS(be32_to_cpu(rpl->atid_status));
 861         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 862         struct tid_info *t = lldi->tids;
 863
 864         csk = lookup_atid(t, atid);
 865         if (unlikely(!csk)) {
 866                 pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
 867                 goto rel_skb;
 868         }
 869
 870         pr_info_ipaddr("tid %u/%u, status %u.\n"
 871                        "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
 872                        atid, tid, status, csk, csk->state, csk->flags);
 873
 874         if (is_neg_adv(status))
 875                 goto rel_skb;
 876
 877         module_put(THIS_MODULE);
 878
 879         if (status && status != CPL_ERR_TCAM_FULL &&
 880             status != CPL_ERR_CONN_EXIST &&
 881             status != CPL_ERR_ARP_MISS)
 882                 cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
 883
 884         cxgbi_sock_get(csk);
 885         spin_lock_bh(&csk->lock);
 886
 887         if (status == CPL_ERR_CONN_EXIST &&
 888             csk->retry_timer.function != csk_act_open_retry_timer) {
 889                 csk->retry_timer.function = csk_act_open_retry_timer;
 890                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 891         } else
 892                 cxgbi_sock_fail_act_open(csk,
 893                                         act_open_rpl_status_to_errno(status));
 894
 895         spin_unlock_bh(&csk->lock);
 896         cxgbi_sock_put(csk);
 897 rel_skb:
 898         __kfree_skb(skb);
 899 }
 900
 901 static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
 902 {
 903         struct cxgbi_sock *csk;
 904         struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
 905         unsigned int tid = GET_TID(req);
 906         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 907         struct tid_info *t = lldi->tids;
 908
 909         csk = lookup_tid(t, tid);
 910         if (unlikely(!csk)) {
 911                 pr_err("can't find connection for tid %u.\n", tid);
 912                 goto rel_skb;
 913         }
 914         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 915                        (&csk->saddr), (&csk->daddr),
 916                        csk, csk->state, csk->flags, csk->tid);
 917         cxgbi_sock_rcv_peer_close(csk);
 918 rel_skb:
 919         __kfree_skb(skb);
 920 }
 921
 922 static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
 923 {
 924         struct cxgbi_sock *csk;
 925         struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
 926         unsigned int tid = GET_TID(rpl);
 927         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 928         struct tid_info *t = lldi->tids;
 929
 930         csk = lookup_tid(t, tid);
 931         if (unlikely(!csk)) {
 932                 pr_err("can't find connection for tid %u.\n", tid);
 933                 goto rel_skb;
 934         }
 935         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
 936                        (&csk->saddr), (&csk->daddr),
 937                        csk, csk->state, csk->flags, csk->tid);
 938         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 939 rel_skb:
 940         __kfree_skb(skb);
 941 }
 942
 943 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 944                                                                 int *need_rst)
 945 {
 946         switch (abort_reason) {
 947         case CPL_ERR_BAD_SYN: /* fall through */
 948         case CPL_ERR_CONN_RESET:
 949                 return csk->state > CTP_ESTABLISHED ?
 950                         -EPIPE : -ECONNRESET;
 951         case CPL_ERR_XMIT_TIMEDOUT:
 952         case CPL_ERR_PERSIST_TIMEDOUT:
 953         case CPL_ERR_FINWAIT2_TIMEDOUT:
 954         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 955                 return -ETIMEDOUT;
 956         default:
 957                 return -EIO;
 958         }
 959 }
 960
 961 static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
 962 {
 963         struct cxgbi_sock *csk;
 964         struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
 965         unsigned int tid = GET_TID(req);
 966         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
 967         struct tid_info *t = lldi->tids;
 968         int rst_status = CPL_ABORT_NO_RST;
 969
 970         csk = lookup_tid(t, tid);
 971         if (unlikely(!csk)) {
 972                 pr_err("can't find connection for tid %u.\n", tid);
 973                 goto rel_skb;
 974         }
 975
 976         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
 977                        (&csk->saddr), (&csk->daddr),
 978                        csk, csk->state, csk->flags, csk->tid, req->status);
 979
 980         if (is_neg_adv(req->status))
 981                 goto rel_skb;
 982
 983         cxgbi_sock_get(csk);
 984         spin_lock_bh(&csk->lock);
 985
 986         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 987
 988         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 989                 send_tx_flowc_wr(csk);
 990                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 991         }
 992
 993         cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 994         cxgbi_sock_set_state(csk, CTP_ABORTING);
 995
 996         send_abort_rpl(csk, rst_status);
 997
 998         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 999                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
1000                 cxgbi_sock_closed(csk);
1001         }
1002
1003         spin_unlock_bh(&csk->lock);
1004         cxgbi_sock_put(csk);
1005 rel_skb:
1006         __kfree_skb(skb);
1007 }
1008
1009 static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
1010 {
1011         struct cxgbi_sock *csk;
1012         struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
1013         unsigned int tid = GET_TID(rpl);
1014         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1015         struct tid_info *t = lldi->tids;
1016
1017         csk = lookup_tid(t, tid);
1018         if (!csk)
1019                 goto rel_skb;
1020
1021         if (csk)
1022                 pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
1023                                (&csk->saddr), (&csk->daddr), csk,
1024                                csk->state, csk->flags, csk->tid, rpl->status);
1025
1026         if (rpl->status == CPL_ERR_ABORT_FAILED)
1027                 goto rel_skb;
1028
1029         cxgbi_sock_rcv_abort_rpl(csk);
1030 rel_skb:
1031         __kfree_skb(skb);
1032 }
1033
1034 static void do_rx_data(struct cxgbi_device *cdev, struct sk_buff *skb)
1035 {
1036         struct cxgbi_sock *csk;
1037         struct cpl_rx_data *cpl = (struct cpl_rx_data *)skb->data;
1038         unsigned int tid = GET_TID(cpl);
1039         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1040         struct tid_info *t = lldi->tids;
1041
1042         csk = lookup_tid(t, tid);
1043         if (!csk) {
1044                 pr_err("can't find connection for tid %u.\n", tid);
1045         } else {
1046                 /* not expecting this, reset the connection. */
1047                 pr_err("csk 0x%p, tid %u, rcv cpl_rx_data.\n", csk, tid);
1048                 spin_lock_bh(&csk->lock);
1049                 send_abort_req(csk);
1050                 spin_unlock_bh(&csk->lock);
1051         }
1052         __kfree_skb(skb);
1053 }
1054
1055 static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
1056 {
1057         struct cxgbi_sock *csk;
1058         struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
1059         unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
1060         unsigned int tid = GET_TID(cpl);
1061         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1062         struct tid_info *t = lldi->tids;
1063
1064         csk = lookup_tid(t, tid);
1065         if (unlikely(!csk)) {
1066                 pr_err("can't find conn. for tid %u.\n", tid);
1067                 goto rel_skb;
1068         }
1069
1070         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1071                 "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
1072                 csk, csk->state, csk->flags, csk->tid, skb, skb->len,
1073                 pdu_len_ddp);
1074
1075         spin_lock_bh(&csk->lock);
1076
1077         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1078                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1079                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1080                         csk, csk->state, csk->flags, csk->tid);
1081                 if (csk->state != CTP_ABORTING)
1082                         goto abort_conn;
1083                 else
1084                         goto discard;
1085         }
1086
1087         cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
1088         cxgbi_skcb_flags(skb) = 0;
1089
1090         skb_reset_transport_header(skb);
1091         __skb_pull(skb, sizeof(*cpl));
1092         __pskb_trim(skb, ntohs(cpl->len));
1093
1094         if (!csk->skb_ulp_lhdr) {
1095                 unsigned char *bhs;
1096                 unsigned int hlen, dlen, plen;
1097
1098                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1099                         "csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
1100                         csk, csk->state, csk->flags, csk->tid, skb);
1101                 csk->skb_ulp_lhdr = skb;
1102                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
1103
1104                 if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
1105                         pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
1106                                 csk->tid, cxgbi_skcb_tcp_seq(skb),
1107                                 csk->rcv_nxt);
1108                         goto abort_conn;
1109                 }
1110
1111                 bhs = skb->data;
1112                 hlen = ntohs(cpl->len);
1113                 dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
1114
1115                 plen = ISCSI_PDU_LEN(pdu_len_ddp);
1116                 if (is_t4(lldi->adapter_type))
1117                         plen -= 40;
1118
1119                 if ((hlen + dlen) != plen) {
1120                         pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
1121                                 "mismatch %u != %u + %u, seq 0x%x.\n",
1122                                 csk->tid, plen, hlen, dlen,
1123                                 cxgbi_skcb_tcp_seq(skb));
1124                         goto abort_conn;
1125                 }
1126
1127                 cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
1128                 if (dlen)
1129                         cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
1130                 csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
1131
1132                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1133                         "csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
1134                         csk, skb, *bhs, hlen, dlen,
1135                         ntohl(*((unsigned int *)(bhs + 16))),
1136                         ntohl(*((unsigned int *)(bhs + 24))));
1137
1138         } else {
1139                 struct sk_buff *lskb = csk->skb_ulp_lhdr;
1140
1141                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
1142                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1143                         "csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
1144                         csk, csk->state, csk->flags, skb, lskb);
1145         }
1146
1147         __skb_queue_tail(&csk->receive_queue, skb);
1148         spin_unlock_bh(&csk->lock);
1149         return;
1150
1151 abort_conn:
1152         send_abort_req(csk);
1153 discard:
1154         spin_unlock_bh(&csk->lock);
1155 rel_skb:
1156         __kfree_skb(skb);
1157 }
1158
1159 static void do_rx_data_ddp(struct cxgbi_device *cdev,
1160                                   struct sk_buff *skb)
1161 {
1162         struct cxgbi_sock *csk;
1163         struct sk_buff *lskb;
1164         struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
1165         unsigned int tid = GET_TID(rpl);
1166         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1167         struct tid_info *t = lldi->tids;
1168         unsigned int status = ntohl(rpl->ddpvld);
1169
1170         csk = lookup_tid(t, tid);
1171         if (unlikely(!csk)) {
1172                 pr_err("can't find connection for tid %u.\n", tid);
1173                 goto rel_skb;
1174         }
1175
1176         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
1177                 "csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
1178                 csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
1179
1180         spin_lock_bh(&csk->lock);
1181
1182         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
1183                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1184                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
1185                         csk, csk->state, csk->flags, csk->tid);
1186                 if (csk->state != CTP_ABORTING)
1187                         goto abort_conn;
1188                 else
1189                         goto discard;
1190         }
1191
1192         if (!csk->skb_ulp_lhdr) {
1193                 pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
1194                 goto abort_conn;
1195         }
1196
1197         lskb = csk->skb_ulp_lhdr;
1198         csk->skb_ulp_lhdr = NULL;
1199
1200         cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
1201
1202         if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
1203                 pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
1204                         csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
1205
1206         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
1207                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
1208                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1209                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
1210         }
1211         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
1212                 pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
1213                         csk, lskb, status, cxgbi_skcb_flags(lskb));
1214                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
1215         }
1216         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
1217                 log_debug(1 << CXGBI_DBG_PDU_RX,
1218                         "csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
1219                         csk, lskb, status);
1220                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
1221         }
1222         if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
1223                 !cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
1224                 log_debug(1 << CXGBI_DBG_PDU_RX,
1225                         "csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
1226                         csk, lskb, status);
1227                 cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
1228         }
1229         log_debug(1 << CXGBI_DBG_PDU_RX,
1230                 "csk 0x%p, lskb 0x%p, f 0x%lx.\n",
1231                 csk, lskb, cxgbi_skcb_flags(lskb));
1232
1233         cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
1234         cxgbi_conn_pdu_ready(csk);
1235         spin_unlock_bh(&csk->lock);
1236         goto rel_skb;
1237
1238 abort_conn:
1239         send_abort_req(csk);
1240 discard:
1241         spin_unlock_bh(&csk->lock);
1242 rel_skb:
1243         __kfree_skb(skb);
1244 }
1245
1246 static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
1247 {
1248         struct cxgbi_sock *csk;
1249         struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
1250         unsigned int tid = GET_TID(rpl);
1251         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1252         struct tid_info *t = lldi->tids;
1253
1254         csk = lookup_tid(t, tid);
1255         if (unlikely(!csk))
1256                 pr_err("can't find connection for tid %u.\n", tid);
1257         else {
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                 cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
1262                                         rpl->seq_vld);
1263         }
1264         __kfree_skb(skb);
1265 }
1266
1267 static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
1268 {
1269         struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
1270         unsigned int tid = GET_TID(rpl);
1271         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1272         struct tid_info *t = lldi->tids;
1273         struct cxgbi_sock *csk;
1274
1275         csk = lookup_tid(t, tid);
1276         if (!csk)
1277                 pr_err("can't find conn. for tid %u.\n", tid);
1278
1279         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1280                 "csk 0x%p,%u,%lx,%u, status 0x%x.\n",
1281                 csk, csk->state, csk->flags, csk->tid, rpl->status);
1282
1283         if (rpl->status != CPL_ERR_NONE)
1284                 pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
1285                         csk, tid, rpl->status);
1286
1287         __kfree_skb(skb);
1288 }
1289
1290 static int alloc_cpls(struct cxgbi_sock *csk)
1291 {
1292         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
1293                                         0, GFP_KERNEL);
1294         if (!csk->cpl_close)
1295                 return -ENOMEM;
1296
1297         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
1298                                         0, GFP_KERNEL);
1299         if (!csk->cpl_abort_req)
1300                 goto free_cpls;
1301
1302         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
1303                                         0, GFP_KERNEL);
1304         if (!csk->cpl_abort_rpl)
1305                 goto free_cpls;
1306         return 0;
1307
1308 free_cpls:
1309         cxgbi_sock_free_cpl_skbs(csk);
1310         return -ENOMEM;
1311 }
1312
1313 static inline void l2t_put(struct cxgbi_sock *csk)
1314 {
1315         if (csk->l2t) {
1316                 cxgb4_l2t_release(csk->l2t);
1317                 csk->l2t = NULL;
1318                 cxgbi_sock_put(csk);
1319         }
1320 }
1321
1322 static void release_offload_resources(struct cxgbi_sock *csk)
1323 {
1324         struct cxgb4_lld_info *lldi;
1325
1326         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1327                 "csk 0x%p,%u,0x%lx,%u.\n",
1328                 csk, csk->state, csk->flags, csk->tid);
1329
1330         cxgbi_sock_free_cpl_skbs(csk);
1331         if (csk->wr_cred != csk->wr_max_cred) {
1332                 cxgbi_sock_purge_wr_queue(csk);
1333                 cxgbi_sock_reset_wr_list(csk);
1334         }
1335
1336         l2t_put(csk);
1337         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
1338                 free_atid(csk);
1339         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
1340                 lldi = cxgbi_cdev_priv(csk->cdev);
1341                 cxgb4_remove_tid(lldi->tids, 0, csk->tid);
1342                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
1343                 cxgbi_sock_put(csk);
1344         }
1345         csk->dst = NULL;
1346         csk->cdev = NULL;
1347 }
1348
1349 static int init_act_open(struct cxgbi_sock *csk)
1350 {
1351         struct cxgbi_device *cdev = csk->cdev;
1352         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1353         struct net_device *ndev = cdev->ports[csk->port_id];
1354         struct sk_buff *skb = NULL;
1355         struct neighbour *n = NULL;
1356         void *daddr;
1357         unsigned int step;
1358         unsigned int size, size6;
1359         int t4 = is_t4(lldi->adapter_type);
1360
1361         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1362                 "csk 0x%p,%u,0x%lx,%u.\n",
1363                 csk, csk->state, csk->flags, csk->tid);
1364
1365         if (csk->csk_family == AF_INET)
1366                 daddr = &csk->daddr.sin_addr.s_addr;
1367 #if IS_ENABLED(CONFIG_IPV6)
1368         else if (csk->csk_family == AF_INET6)
1369                 daddr = &csk->daddr6.sin6_addr;
1370 #endif
1371         else {
1372                 pr_err("address family 0x%x not supported\n", csk->csk_family);
1373                 goto rel_resource;
1374         }
1375
1376         n = dst_neigh_lookup(csk->dst, daddr);
1377
1378         if (!n) {
1379                 pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
1380                 goto rel_resource;
1381         }
1382
1383         csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
1384         if (csk->atid < 0) {
1385                 pr_err("%s, NO atid available.\n", ndev->name);
1386                 return -EINVAL;
1387         }
1388         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1389         cxgbi_sock_get(csk);
1390
1391         csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
1392         if (!csk->l2t) {
1393                 pr_err("%s, cannot alloc l2t.\n", ndev->name);
1394                 goto rel_resource;
1395         }
1396         cxgbi_sock_get(csk);
1397
1398         if (t4) {
1399                 size = sizeof(struct cpl_act_open_req);
1400                 size6 = sizeof(struct cpl_act_open_req6);
1401         } else {
1402                 size = sizeof(struct cpl_t5_act_open_req);
1403                 size6 = sizeof(struct cpl_t5_act_open_req6);
1404         }
1405
1406         if (csk->csk_family == AF_INET)
1407                 skb = alloc_wr(size, 0, GFP_NOIO);
1408 #if IS_ENABLED(CONFIG_IPV6)
1409         else
1410                 skb = alloc_wr(size6, 0, GFP_NOIO);
1411 #endif
1412
1413         if (!skb)
1414                 goto rel_resource;
1415         skb->sk = (struct sock *)csk;
1416         t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
1417
1418         if (!csk->mtu)
1419                 csk->mtu = dst_mtu(csk->dst);
1420         cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
1421         csk->tx_chan = cxgb4_port_chan(ndev);
1422         /* SMT two entries per row */
1423         csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
1424         step = lldi->ntxq / lldi->nchan;
1425         csk->txq_idx = cxgb4_port_idx(ndev) * step;
1426         step = lldi->nrxq / lldi->nchan;
1427         csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
1428         csk->wr_cred = lldi->wr_cred -
1429                        DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
1430         csk->wr_max_cred = csk->wr_cred;
1431         csk->wr_una_cred = 0;
1432         cxgbi_sock_reset_wr_list(csk);
1433         csk->err = 0;
1434
1435         pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
1436                        (&csk->saddr), (&csk->daddr), csk, csk->state,
1437                        csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
1438                        csk->mtu, csk->mss_idx, csk->smac_idx);
1439
1440         /* must wait for either a act_open_rpl or act_open_establish */
1441         try_module_get(THIS_MODULE);
1442         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1443         if (csk->csk_family == AF_INET)
1444                 send_act_open_req(csk, skb, csk->l2t);
1445 #if IS_ENABLED(CONFIG_IPV6)
1446         else
1447                 send_act_open_req6(csk, skb, csk->l2t);
1448 #endif
1449         neigh_release(n);
1450
1451         return 0;
1452
1453 rel_resource:
1454         if (n)
1455                 neigh_release(n);
1456         if (skb)
1457                 __kfree_skb(skb);
1458         return -EINVAL;
1459 }
1460
1461 cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
1462         [CPL_ACT_ESTABLISH] = do_act_establish,
1463         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1464         [CPL_PEER_CLOSE] = do_peer_close,
1465         [CPL_ABORT_REQ_RSS] = do_abort_req_rss,
1466         [CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
1467         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1468         [CPL_FW4_ACK] = do_fw4_ack,
1469         [CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
1470         [CPL_ISCSI_DATA] = do_rx_iscsi_hdr,
1471         [CPL_SET_TCB_RPL] = do_set_tcb_rpl,
1472         [CPL_RX_DATA_DDP] = do_rx_data_ddp,
1473         [CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
1474         [CPL_RX_DATA] = do_rx_data,
1475 };
1476
1477 int cxgb4i_ofld_init(struct cxgbi_device *cdev)
1478 {
1479         int rc;
1480
1481         if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
1482                 cxgb4i_max_connect = CXGB4I_MAX_CONN;
1483
1484         rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
1485                                         cxgb4i_max_connect);
1486         if (rc < 0)
1487                 return rc;
1488
1489         cdev->csk_release_offload_resources = release_offload_resources;
1490         cdev->csk_push_tx_frames = push_tx_frames;
1491         cdev->csk_send_abort_req = send_abort_req;
1492         cdev->csk_send_close_req = send_close_req;
1493         cdev->csk_send_rx_credits = send_rx_credits;
1494         cdev->csk_alloc_cpls = alloc_cpls;
1495         cdev->csk_init_act_open = init_act_open;
1496
1497         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1498         return 0;
1499 }
1500
1501 /*
1502  * functions to program the pagepod in h/w
1503  */
1504 #define ULPMEM_IDATA_MAX_NPPODS 4 /* 256/PPOD_SIZE */
1505 static inline void ulp_mem_io_set_hdr(struct cxgb4_lld_info *lldi,
1506                                 struct ulp_mem_io *req,
1507                                 unsigned int wr_len, unsigned int dlen,
1508                                 unsigned int pm_addr)
1509 {
1510         struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
1511
1512         INIT_ULPTX_WR(req, wr_len, 0, 0);
1513         if (is_t4(lldi->adapter_type))
1514                 req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
1515                                         (ULP_MEMIO_ORDER_F));
1516         else
1517                 req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
1518                                         (T5_ULP_MEMIO_IMM_F));
1519         req->dlen = htonl(ULP_MEMIO_DATA_LEN_V(dlen >> 5));
1520         req->lock_addr = htonl(ULP_MEMIO_ADDR_V(pm_addr >> 5));
1521         req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
1522
1523         idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_IMM));
1524         idata->len = htonl(dlen);
1525 }
1526
1527 static int ddp_ppod_write_idata(struct cxgbi_device *cdev, unsigned int port_id,
1528                                 struct cxgbi_pagepod_hdr *hdr, unsigned int idx,
1529                                 unsigned int npods,
1530                                 struct cxgbi_gather_list *gl,
1531                                 unsigned int gl_pidx)
1532 {
1533         struct cxgbi_ddp_info *ddp = cdev->ddp;
1534         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1535         struct sk_buff *skb;
1536         struct ulp_mem_io *req;
1537         struct ulptx_idata *idata;
1538         struct cxgbi_pagepod *ppod;
1539         unsigned int pm_addr = idx * PPOD_SIZE + ddp->llimit;
1540         unsigned int dlen = PPOD_SIZE * npods;
1541         unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
1542                                 sizeof(struct ulptx_idata) + dlen, 16);
1543         unsigned int i;
1544
1545         skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
1546         if (!skb) {
1547                 pr_err("cdev 0x%p, idx %u, npods %u, OOM.\n",
1548                         cdev, idx, npods);
1549                 return -ENOMEM;
1550         }
1551         req = (struct ulp_mem_io *)skb->head;
1552         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
1553
1554         ulp_mem_io_set_hdr(lldi, req, wr_len, dlen, pm_addr);
1555         idata = (struct ulptx_idata *)(req + 1);
1556         ppod = (struct cxgbi_pagepod *)(idata + 1);
1557
1558         for (i = 0; i < npods; i++, ppod++, gl_pidx += PPOD_PAGES_MAX) {
1559                 if (!hdr && !gl)
1560                         cxgbi_ddp_ppod_clear(ppod);
1561                 else
1562                         cxgbi_ddp_ppod_set(ppod, hdr, gl, gl_pidx);
1563         }
1564
1565         cxgb4_ofld_send(cdev->ports[port_id], skb);
1566         return 0;
1567 }
1568
1569 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1570                         unsigned int idx, unsigned int npods,
1571                         struct cxgbi_gather_list *gl)
1572 {
1573         unsigned int i, cnt;
1574         int err = 0;
1575
1576         for (i = 0; i < npods; i += cnt, idx += cnt) {
1577                 cnt = npods - i;
1578                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1579                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1580                 err = ddp_ppod_write_idata(csk->cdev, csk->port_id, hdr,
1581                                         idx, cnt, gl, 4 * i);
1582                 if (err < 0)
1583                         break;
1584         }
1585         return err;
1586 }
1587
1588 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1589                           unsigned int idx, unsigned int npods)
1590 {
1591         unsigned int i, cnt;
1592         int err;
1593
1594         for (i = 0; i < npods; i += cnt, idx += cnt) {
1595                 cnt = npods - i;
1596                 if (cnt > ULPMEM_IDATA_MAX_NPPODS)
1597                         cnt = ULPMEM_IDATA_MAX_NPPODS;
1598                 err = ddp_ppod_write_idata(chba->cdev, chba->port_id, NULL,
1599                                         idx, cnt, NULL, 0);
1600                 if (err < 0)
1601                         break;
1602         }
1603 }
1604
1605 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
1606                                 int pg_idx, bool reply)
1607 {
1608         struct sk_buff *skb;
1609         struct cpl_set_tcb_field *req;
1610
1611         if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
1612                 return 0;
1613
1614         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1615         if (!skb)
1616                 return -ENOMEM;
1617
1618         /*  set up ulp page size */
1619         req = (struct cpl_set_tcb_field *)skb->head;
1620         INIT_TP_WR(req, csk->tid);
1621         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
1622         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1623         req->word_cookie = htons(0);
1624         req->mask = cpu_to_be64(0x3 << 8);
1625         req->val = cpu_to_be64(pg_idx << 8);
1626         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1627
1628         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1629                 "csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
1630
1631         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1632         return 0;
1633 }
1634
1635 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1636                                  int hcrc, int dcrc, int reply)
1637 {
1638         struct sk_buff *skb;
1639         struct cpl_set_tcb_field *req;
1640
1641         if (!hcrc && !dcrc)
1642                 return 0;
1643
1644         skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
1645         if (!skb)
1646                 return -ENOMEM;
1647
1648         csk->hcrc_len = (hcrc ? 4 : 0);
1649         csk->dcrc_len = (dcrc ? 4 : 0);
1650         /*  set up ulp submode */
1651         req = (struct cpl_set_tcb_field *)skb->head;
1652         INIT_TP_WR(req, tid);
1653         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1654         req->reply_ctrl = htons(NO_REPLY(reply) | QUEUENO(csk->rss_qid));
1655         req->word_cookie = htons(0);
1656         req->mask = cpu_to_be64(0x3 << 4);
1657         req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
1658                                 (dcrc ? ULP_CRC_DATA : 0)) << 4);
1659         set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
1660
1661         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1662                 "csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
1663
1664         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1665         return 0;
1666 }
1667
1668 static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
1669 {
1670         struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
1671         struct cxgbi_ddp_info *ddp = cdev->ddp;
1672         unsigned int tagmask, pgsz_factor[4];
1673         int err;
1674
1675         if (ddp) {
1676                 kref_get(&ddp->refcnt);
1677                 pr_warn("cdev 0x%p, ddp 0x%p already set up.\n",
1678                         cdev, cdev->ddp);
1679                 return -EALREADY;
1680         }
1681
1682         err = cxgbi_ddp_init(cdev, lldi->vr->iscsi.start,
1683                         lldi->vr->iscsi.start + lldi->vr->iscsi.size - 1,
1684                         lldi->iscsi_iolen, lldi->iscsi_iolen);
1685         if (err < 0)
1686                 return err;
1687
1688         ddp = cdev->ddp;
1689
1690         tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1691         cxgbi_ddp_page_size_factor(pgsz_factor);
1692         cxgb4_iscsi_init(lldi->ports[0], tagmask, pgsz_factor);
1693
1694         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1695         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1696         cdev->csk_ddp_set = ddp_set_map;
1697         cdev->csk_ddp_clear = ddp_clear_map;
1698
1699         pr_info("cxgb4i 0x%p tag: sw %u, rsvd %u,%u, mask 0x%x.\n",
1700                 cdev, cdev->tag_format.sw_bits, cdev->tag_format.rsvd_bits,
1701                 cdev->tag_format.rsvd_shift, cdev->tag_format.rsvd_mask);
1702         pr_info("cxgb4i 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1703                 " %u/%u.\n",
1704                 cdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1705                 ddp->rsvd_tag_mask, ddp->max_txsz, lldi->iscsi_iolen,
1706                 ddp->max_rxsz, lldi->iscsi_iolen);
1707         pr_info("cxgb4i 0x%p max payload size: %u/%u, %u/%u.\n",
1708                 cdev, cdev->tx_max_size, ddp->max_txsz, cdev->rx_max_size,
1709                 ddp->max_rxsz);
1710         return 0;
1711 }
1712
1713 static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
1714 {
1715         struct cxgbi_device *cdev;
1716         struct port_info *pi;
1717         int i, rc;
1718
1719         cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
1720         if (!cdev) {
1721                 pr_info("t4 device 0x%p, register failed.\n", lldi);
1722                 return NULL;
1723         }
1724         pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
1725                 cdev, lldi->adapter_type, lldi->nports,
1726                 lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
1727                 lldi->nrxq, lldi->wr_cred);
1728         for (i = 0; i < lldi->nrxq; i++)
1729                 log_debug(1 << CXGBI_DBG_DEV,
1730                         "t4 0x%p, rxq id #%d: %u.\n",
1731                         cdev, i, lldi->rxq_ids[i]);
1732
1733         memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
1734         cdev->flags = CXGBI_FLAG_DEV_T4;
1735         cdev->pdev = lldi->pdev;
1736         cdev->ports = lldi->ports;
1737         cdev->nports = lldi->nports;
1738         cdev->mtus = lldi->mtus;
1739         cdev->nmtus = NMTUS;
1740         cdev->snd_win = cxgb4i_snd_win;
1741         cdev->rcv_win = cxgb4i_rcv_win;
1742         cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
1743         cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
1744         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
1745         cdev->itp = &cxgb4i_iscsi_transport;
1746
1747         cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0]))
1748                         << FW_VIID_PFN_S;
1749         pr_info("cdev 0x%p,%s, pfvf %u.\n",
1750                 cdev, lldi->ports[0]->name, cdev->pfvf);
1751
1752         rc = cxgb4i_ddp_init(cdev);
1753         if (rc) {
1754                 pr_info("t4 0x%p ddp init failed.\n", cdev);
1755                 goto err_out;
1756         }
1757         rc = cxgb4i_ofld_init(cdev);
1758         if (rc) {
1759                 pr_info("t4 0x%p ofld init failed.\n", cdev);
1760                 goto err_out;
1761         }
1762
1763         rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
1764                                 &cxgb4i_host_template, cxgb4i_stt);
1765         if (rc)
1766                 goto err_out;
1767
1768         for (i = 0; i < cdev->nports; i++) {
1769                 pi = netdev_priv(lldi->ports[i]);
1770                 cdev->hbas[i]->port_id = pi->port_id;
1771         }
1772         return cdev;
1773
1774 err_out:
1775         cxgbi_device_unregister(cdev);
1776         return ERR_PTR(-ENOMEM);
1777 }
1778
1779 #define RX_PULL_LEN     128
1780 static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
1781                                 const struct pkt_gl *pgl)
1782 {
1783         const struct cpl_act_establish *rpl;
1784         struct sk_buff *skb;
1785         unsigned int opc;
1786         struct cxgbi_device *cdev = handle;
1787
1788         if (pgl == NULL) {
1789                 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1790
1791                 skb = alloc_wr(len, 0, GFP_ATOMIC);
1792                 if (!skb)
1793                         goto nomem;
1794                 skb_copy_to_linear_data(skb, &rsp[1], len);
1795         } else {
1796                 if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
1797                         pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
1798                                 pgl->va, be64_to_cpu(*rsp),
1799                                 be64_to_cpu(*(u64 *)pgl->va),
1800                                 pgl->tot_len);
1801                         return 0;
1802                 }
1803                 skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
1804                 if (unlikely(!skb))
1805                         goto nomem;
1806         }
1807
1808         rpl = (struct cpl_act_establish *)skb->data;
1809         opc = rpl->ot.opcode;
1810         log_debug(1 << CXGBI_DBG_TOE,
1811                 "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
1812                  cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
1813         if (cxgb4i_cplhandlers[opc])
1814                 cxgb4i_cplhandlers[opc](cdev, skb);
1815         else {
1816                 pr_err("No handler for opcode 0x%x.\n", opc);
1817                 __kfree_skb(skb);
1818         }
1819         return 0;
1820 nomem:
1821         log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
1822         return 1;
1823 }
1824
1825 static int t4_uld_state_change(void *handle, enum cxgb4_state state)
1826 {
1827         struct cxgbi_device *cdev = handle;
1828
1829         switch (state) {
1830         case CXGB4_STATE_UP:
1831                 pr_info("cdev 0x%p, UP.\n", cdev);
1832                 break;
1833         case CXGB4_STATE_START_RECOVERY:
1834                 pr_info("cdev 0x%p, RECOVERY.\n", cdev);
1835                 /* close all connections */
1836                 break;
1837         case CXGB4_STATE_DOWN:
1838                 pr_info("cdev 0x%p, DOWN.\n", cdev);
1839                 break;
1840         case CXGB4_STATE_DETACH:
1841                 pr_info("cdev 0x%p, DETACH.\n", cdev);
1842                 cxgbi_device_unregister(cdev);
1843                 break;
1844         default:
1845                 pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
1846                 break;
1847         }
1848         return 0;
1849 }
1850
1851 static int __init cxgb4i_init_module(void)
1852 {
1853         int rc;
1854
1855         printk(KERN_INFO "%s", version);
1856
1857         rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1858         if (rc < 0)
1859                 return rc;
1860         cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
1861
1862         return 0;
1863 }
1864
1865 static void __exit cxgb4i_exit_module(void)
1866 {
1867         cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
1868         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
1869         cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
1870 }
1871
1872 module_init(cxgb4i_init_module);
1873 module_exit(cxgb4i_exit_module);