drivers/target/iscsi/cxgbit/cxgbit_target.c

   1 /*
   2  * Copyright (c) 2016 Chelsio Communications, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/workqueue.h>
  10 #include <linux/kthread.h>
  11 #include <linux/sched/signal.h>
  12
  13 #include <asm/unaligned.h>
  14 #include <net/tcp.h>
  15 #include <target/target_core_base.h>
  16 #include <target/target_core_fabric.h>
  17 #include "cxgbit.h"
  18
  19 struct sge_opaque_hdr {
  20         void *dev;
  21         dma_addr_t addr[MAX_SKB_FRAGS + 1];
  22 };
  23
  24 static const u8 cxgbit_digest_len[] = {0, 4, 4, 8};
  25
  26 #define TX_HDR_LEN (sizeof(struct sge_opaque_hdr) + \
  27                     sizeof(struct fw_ofld_tx_data_wr))
  28
  29 static struct sk_buff *
  30 __cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len, bool iso)
  31 {
  32         struct sk_buff *skb = NULL;
  33         u8 submode = 0;
  34         int errcode;
  35         static const u32 hdr_len = TX_HDR_LEN + ISCSI_HDR_LEN;
  36
  37         if (len) {
  38                 skb = alloc_skb_with_frags(hdr_len, len,
  39                                            0, &errcode,
  40                                            GFP_KERNEL);
  41                 if (!skb)
  42                         return NULL;
  43
  44                 skb_reserve(skb, TX_HDR_LEN);
  45                 skb_reset_transport_header(skb);
  46                 __skb_put(skb, ISCSI_HDR_LEN);
  47                 skb->data_len = len;
  48                 skb->len += len;
  49                 submode |= (csk->submode & CXGBIT_SUBMODE_DCRC);
  50
  51         } else {
  52                 u32 iso_len = iso ? sizeof(struct cpl_tx_data_iso) : 0;
  53
  54                 skb = alloc_skb(hdr_len + iso_len, GFP_KERNEL);
  55                 if (!skb)
  56                         return NULL;
  57
  58                 skb_reserve(skb, TX_HDR_LEN + iso_len);
  59                 skb_reset_transport_header(skb);
  60                 __skb_put(skb, ISCSI_HDR_LEN);
  61         }
  62
  63         submode |= (csk->submode & CXGBIT_SUBMODE_HCRC);
  64         cxgbit_skcb_submode(skb) = submode;
  65         cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[submode];
  66         cxgbit_skcb_flags(skb) |= SKCBF_TX_NEED_HDR;
  67         return skb;
  68 }
  69
  70 static struct sk_buff *cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len)
  71 {
  72         return __cxgbit_alloc_skb(csk, len, false);
  73 }
  74
  75 /*
  76  * cxgbit_is_ofld_imm - check whether a packet can be sent as immediate data
  77  * @skb: the packet
  78  *
  79  * Returns true if a packet can be sent as an offload WR with immediate
  80  * data.  We currently use the same limit as for Ethernet packets.
  81  */
  82 static int cxgbit_is_ofld_imm(const struct sk_buff *skb)
  83 {
  84         int length = skb->len;
  85
  86         if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
  87                 length += sizeof(struct fw_ofld_tx_data_wr);
  88
  89         if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_ISO))
  90                 length += sizeof(struct cpl_tx_data_iso);
  91
  92 #define MAX_IMM_TX_PKT_LEN      256
  93         return length <= MAX_IMM_TX_PKT_LEN;
  94 }
  95
  96 /*
  97  * cxgbit_sgl_len - calculates the size of an SGL of the given capacity
  98  * @n: the number of SGL entries
  99  * Calculates the number of flits needed for a scatter/gather list that
 100  * can hold the given number of entries.
 101  */
 102 static inline unsigned int cxgbit_sgl_len(unsigned int n)
 103 {
 104         n--;
 105         return (3 * n) / 2 + (n & 1) + 2;
 106 }
 107
 108 /*
 109  * cxgbit_calc_tx_flits_ofld - calculate # of flits for an offload packet
 110  * @skb: the packet
 111  *
 112  * Returns the number of flits needed for the given offload packet.
 113  * These packets are already fully constructed and no additional headers
 114  * will be added.
 115  */
 116 static unsigned int cxgbit_calc_tx_flits_ofld(const struct sk_buff *skb)
 117 {
 118         unsigned int flits, cnt;
 119
 120         if (cxgbit_is_ofld_imm(skb))
 121                 return DIV_ROUND_UP(skb->len, 8);
 122         flits = skb_transport_offset(skb) / 8;
 123         cnt = skb_shinfo(skb)->nr_frags;
 124         if (skb_tail_pointer(skb) != skb_transport_header(skb))
 125                 cnt++;
 126         return flits + cxgbit_sgl_len(cnt);
 127 }
 128
 129 #define CXGBIT_ISO_FSLICE 0x1
 130 #define CXGBIT_ISO_LSLICE 0x2
 131 static void
 132 cxgbit_cpl_tx_data_iso(struct sk_buff *skb, struct cxgbit_iso_info *iso_info)
 133 {
 134         struct cpl_tx_data_iso *cpl;
 135         unsigned int submode = cxgbit_skcb_submode(skb);
 136         unsigned int fslice = !!(iso_info->flags & CXGBIT_ISO_FSLICE);
 137         unsigned int lslice = !!(iso_info->flags & CXGBIT_ISO_LSLICE);
 138
 139         cpl = (struct cpl_tx_data_iso *)__skb_push(skb, sizeof(*cpl));
 140
 141         cpl->op_to_scsi = htonl(CPL_TX_DATA_ISO_OP_V(CPL_TX_DATA_ISO) |
 142                         CPL_TX_DATA_ISO_FIRST_V(fslice) |
 143                         CPL_TX_DATA_ISO_LAST_V(lslice) |
 144                         CPL_TX_DATA_ISO_CPLHDRLEN_V(0) |
 145                         CPL_TX_DATA_ISO_HDRCRC_V(submode & 1) |
 146                         CPL_TX_DATA_ISO_PLDCRC_V(((submode >> 1) & 1)) |
 147                         CPL_TX_DATA_ISO_IMMEDIATE_V(0) |
 148                         CPL_TX_DATA_ISO_SCSI_V(2));
 149
 150         cpl->ahs_len = 0;
 151         cpl->mpdu = htons(DIV_ROUND_UP(iso_info->mpdu, 4));
 152         cpl->burst_size = htonl(DIV_ROUND_UP(iso_info->burst_len, 4));
 153         cpl->len = htonl(iso_info->len);
 154         cpl->reserved2_seglen_offset = htonl(0);
 155         cpl->datasn_offset = htonl(0);
 156         cpl->buffer_offset = htonl(0);
 157         cpl->reserved3 = 0;
 158
 159         __skb_pull(skb, sizeof(*cpl));
 160 }
 161
 162 static void
 163 cxgbit_tx_data_wr(struct cxgbit_sock *csk, struct sk_buff *skb, u32 dlen,
 164                   u32 len, u32 credits, u32 compl)
 165 {
 166         struct fw_ofld_tx_data_wr *req;
 167         const struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
 168         u32 submode = cxgbit_skcb_submode(skb);
 169         u32 wr_ulp_mode = 0;
 170         u32 hdr_size = sizeof(*req);
 171         u32 opcode = FW_OFLD_TX_DATA_WR;
 172         u32 immlen = 0;
 173         u32 force = is_t5(lldi->adapter_type) ? TX_FORCE_V(!submode) :
 174                     T6_TX_FORCE_F;
 175
 176         if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO) {
 177                 opcode = FW_ISCSI_TX_DATA_WR;
 178                 immlen += sizeof(struct cpl_tx_data_iso);
 179                 hdr_size += sizeof(struct cpl_tx_data_iso);
 180                 submode |= 8;
 181         }
 182
 183         if (cxgbit_is_ofld_imm(skb))
 184                 immlen += dlen;
 185
 186         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb,
 187                                                         hdr_size);
 188         req->op_to_immdlen = cpu_to_be32(FW_WR_OP_V(opcode) |
 189                                         FW_WR_COMPL_V(compl) |
 190                                         FW_WR_IMMDLEN_V(immlen));
 191         req->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
 192                                         FW_WR_LEN16_V(credits));
 193         req->plen = htonl(len);
 194         wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP_MODE_ISCSI) |
 195                                 FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
 196
 197         req->tunnel_to_proxy = htonl((wr_ulp_mode) | force |
 198                  FW_OFLD_TX_DATA_WR_SHOVE_V(skb_peek(&csk->txq) ? 0 : 1));
 199 }
 200
 201 static void cxgbit_arp_failure_skb_discard(void *handle, struct sk_buff *skb)
 202 {
 203         kfree_skb(skb);
 204 }
 205
 206 void cxgbit_push_tx_frames(struct cxgbit_sock *csk)
 207 {
 208         struct sk_buff *skb;
 209
 210         while (csk->wr_cred && ((skb = skb_peek(&csk->txq)) != NULL)) {
 211                 u32 dlen = skb->len;
 212                 u32 len = skb->len;
 213                 u32 credits_needed;
 214                 u32 compl = 0;
 215                 u32 flowclen16 = 0;
 216                 u32 iso_cpl_len = 0;
 217
 218                 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO)
 219                         iso_cpl_len = sizeof(struct cpl_tx_data_iso);
 220
 221                 if (cxgbit_is_ofld_imm(skb))
 222                         credits_needed = DIV_ROUND_UP(dlen + iso_cpl_len, 16);
 223                 else
 224                         credits_needed = DIV_ROUND_UP((8 *
 225                                         cxgbit_calc_tx_flits_ofld(skb)) +
 226                                         iso_cpl_len, 16);
 227
 228                 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
 229                         credits_needed += DIV_ROUND_UP(
 230                                 sizeof(struct fw_ofld_tx_data_wr), 16);
 231                 /*
 232                  * Assumes the initial credits is large enough to support
 233                  * fw_flowc_wr plus largest possible first payload
 234                  */
 235
 236                 if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags)) {
 237                         flowclen16 = cxgbit_send_tx_flowc_wr(csk);
 238                         csk->wr_cred -= flowclen16;
 239                         csk->wr_una_cred += flowclen16;
 240                 }
 241
 242                 if (csk->wr_cred < credits_needed) {
 243                         pr_debug("csk 0x%p, skb %u/%u, wr %d < %u.\n",
 244                                  csk, skb->len, skb->data_len,
 245                                  credits_needed, csk->wr_cred);
 246                         break;
 247                 }
 248                 __skb_unlink(skb, &csk->txq);
 249                 set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
 250                 skb->csum = (__force __wsum)(credits_needed + flowclen16);
 251                 csk->wr_cred -= credits_needed;
 252                 csk->wr_una_cred += credits_needed;
 253
 254                 pr_debug("csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
 255                          csk, skb->len, skb->data_len, credits_needed,
 256                          csk->wr_cred, csk->wr_una_cred);
 257
 258                 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) {
 259                         len += cxgbit_skcb_tx_extralen(skb);
 260
 261                         if ((csk->wr_una_cred >= (csk->wr_max_cred / 2)) ||
 262                             (!before(csk->write_seq,
 263                                      csk->snd_una + csk->snd_win))) {
 264                                 compl = 1;
 265                                 csk->wr_una_cred = 0;
 266                         }
 267
 268                         cxgbit_tx_data_wr(csk, skb, dlen, len, credits_needed,
 269                                           compl);
 270                         csk->snd_nxt += len;
 271
 272                 } else if ((cxgbit_skcb_flags(skb) & SKCBF_TX_FLAG_COMPL) ||
 273                            (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
 274                         struct cpl_close_con_req *req =
 275                                 (struct cpl_close_con_req *)skb->data;
 276                         req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
 277                         csk->wr_una_cred = 0;
 278                 }
 279
 280                 cxgbit_sock_enqueue_wr(csk, skb);
 281                 t4_set_arp_err_handler(skb, csk,
 282                                        cxgbit_arp_failure_skb_discard);
 283
 284                 pr_debug("csk 0x%p,%u, skb 0x%p, %u.\n",
 285                          csk, csk->tid, skb, len);
 286
 287                 cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
 288         }
 289 }
 290
 291 static bool cxgbit_lock_sock(struct cxgbit_sock *csk)
 292 {
 293         spin_lock_bh(&csk->lock);
 294
 295         if (before(csk->write_seq, csk->snd_una + csk->snd_win))
 296                 csk->lock_owner = true;
 297
 298         spin_unlock_bh(&csk->lock);
 299
 300         return csk->lock_owner;
 301 }
 302
 303 static void cxgbit_unlock_sock(struct cxgbit_sock *csk)
 304 {
 305         struct sk_buff_head backlogq;
 306         struct sk_buff *skb;
 307         void (*fn)(struct cxgbit_sock *, struct sk_buff *);
 308
 309         skb_queue_head_init(&backlogq);
 310
 311         spin_lock_bh(&csk->lock);
 312         while (skb_queue_len(&csk->backlogq)) {
 313                 skb_queue_splice_init(&csk->backlogq, &backlogq);
 314                 spin_unlock_bh(&csk->lock);
 315
 316                 while ((skb = __skb_dequeue(&backlogq))) {
 317                         fn = cxgbit_skcb_rx_backlog_fn(skb);
 318                         fn(csk, skb);
 319                 }
 320
 321                 spin_lock_bh(&csk->lock);
 322         }
 323
 324         csk->lock_owner = false;
 325         spin_unlock_bh(&csk->lock);
 326 }
 327
 328 static int cxgbit_queue_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
 329 {
 330         int ret = 0;
 331
 332         wait_event_interruptible(csk->ack_waitq, cxgbit_lock_sock(csk));
 333
 334         if (unlikely((csk->com.state != CSK_STATE_ESTABLISHED) ||
 335                      signal_pending(current))) {
 336                 __kfree_skb(skb);
 337                 __skb_queue_purge(&csk->ppodq);
 338                 ret = -1;
 339                 spin_lock_bh(&csk->lock);
 340                 if (csk->lock_owner) {
 341                         spin_unlock_bh(&csk->lock);
 342                         goto unlock;
 343                 }
 344                 spin_unlock_bh(&csk->lock);
 345                 return ret;
 346         }
 347
 348         csk->write_seq += skb->len +
 349                           cxgbit_skcb_tx_extralen(skb);
 350
 351         skb_queue_splice_tail_init(&csk->ppodq, &csk->txq);
 352         __skb_queue_tail(&csk->txq, skb);
 353         cxgbit_push_tx_frames(csk);
 354
 355 unlock:
 356         cxgbit_unlock_sock(csk);
 357         return ret;
 358 }
 359
 360 static int
 361 cxgbit_map_skb(struct iscsi_cmd *cmd, struct sk_buff *skb, u32 data_offset,
 362                u32 data_length)
 363 {
 364         u32 i = 0, nr_frags = MAX_SKB_FRAGS;
 365         u32 padding = ((-data_length) & 3);
 366         struct scatterlist *sg;
 367         struct page *page;
 368         unsigned int page_off;
 369
 370         if (padding)
 371                 nr_frags--;
 372
 373         /*
 374          * We know each entry in t_data_sg contains a page.
 375          */
 376         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 377         page_off = (data_offset % PAGE_SIZE);
 378
 379         while (data_length && (i < nr_frags)) {
 380                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 381
 382                 page = sg_page(sg);
 383
 384                 get_page(page);
 385                 skb_fill_page_desc(skb, i, page, sg->offset + page_off,
 386                                    cur_len);
 387                 skb->data_len += cur_len;
 388                 skb->len += cur_len;
 389                 skb->truesize += cur_len;
 390
 391                 data_length -= cur_len;
 392                 page_off = 0;
 393                 sg = sg_next(sg);
 394                 i++;
 395         }
 396
 397         if (data_length)
 398                 return -1;
 399
 400         if (padding) {
 401                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 402                 if (!page)
 403                         return -1;
 404                 skb_fill_page_desc(skb, i, page, 0, padding);
 405                 skb->data_len += padding;
 406                 skb->len += padding;
 407                 skb->truesize += padding;
 408         }
 409
 410         return 0;
 411 }
 412
 413 static int
 414 cxgbit_tx_datain_iso(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
 415                      struct iscsi_datain_req *dr)
 416 {
 417         struct iscsi_conn *conn = csk->conn;
 418         struct sk_buff *skb;
 419         struct iscsi_datain datain;
 420         struct cxgbit_iso_info iso_info;
 421         u32 data_length = cmd->se_cmd.data_length;
 422         u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
 423         u32 num_pdu, plen, tx_data = 0;
 424         bool task_sense = !!(cmd->se_cmd.se_cmd_flags &
 425                 SCF_TRANSPORT_TASK_SENSE);
 426         bool set_statsn = false;
 427         int ret = -1;
 428
 429         while (data_length) {
 430                 num_pdu = (data_length + mrdsl - 1) / mrdsl;
 431                 if (num_pdu > csk->max_iso_npdu)
 432                         num_pdu = csk->max_iso_npdu;
 433
 434                 plen = num_pdu * mrdsl;
 435                 if (plen > data_length)
 436                         plen = data_length;
 437
 438                 skb = __cxgbit_alloc_skb(csk, 0, true);
 439                 if (unlikely(!skb))
 440                         return -ENOMEM;
 441
 442                 memset(skb->data, 0, ISCSI_HDR_LEN);
 443                 cxgbit_skcb_flags(skb) |= SKCBF_TX_ISO;
 444                 cxgbit_skcb_submode(skb) |= (csk->submode &
 445                                 CXGBIT_SUBMODE_DCRC);
 446                 cxgbit_skcb_tx_extralen(skb) = (num_pdu *
 447                                 cxgbit_digest_len[cxgbit_skcb_submode(skb)]) +
 448                                                 ((num_pdu - 1) * ISCSI_HDR_LEN);
 449
 450                 memset(&datain, 0, sizeof(struct iscsi_datain));
 451                 memset(&iso_info, 0, sizeof(iso_info));
 452
 453                 if (!tx_data)
 454                         iso_info.flags |= CXGBIT_ISO_FSLICE;
 455
 456                 if (!(data_length - plen)) {
 457                         iso_info.flags |= CXGBIT_ISO_LSLICE;
 458                         if (!task_sense) {
 459                                 datain.flags = ISCSI_FLAG_DATA_STATUS;
 460                                 iscsit_increment_maxcmdsn(cmd, conn->sess);
 461                                 cmd->stat_sn = conn->stat_sn++;
 462                                 set_statsn = true;
 463                         }
 464                 }
 465
 466                 iso_info.burst_len = num_pdu * mrdsl;
 467                 iso_info.mpdu = mrdsl;
 468                 iso_info.len = ISCSI_HDR_LEN + plen;
 469
 470                 cxgbit_cpl_tx_data_iso(skb, &iso_info);
 471
 472                 datain.offset = tx_data;
 473                 datain.data_sn = cmd->data_sn - 1;
 474
 475                 iscsit_build_datain_pdu(cmd, conn, &datain,
 476                                         (struct iscsi_data_rsp *)skb->data,
 477                                         set_statsn);
 478
 479                 ret = cxgbit_map_skb(cmd, skb, tx_data, plen);
 480                 if (unlikely(ret)) {
 481                         __kfree_skb(skb);
 482                         goto out;
 483                 }
 484
 485                 ret = cxgbit_queue_skb(csk, skb);
 486                 if (unlikely(ret))
 487                         goto out;
 488
 489                 tx_data += plen;
 490                 data_length -= plen;
 491
 492                 cmd->read_data_done += plen;
 493                 cmd->data_sn += num_pdu;
 494         }
 495
 496         dr->dr_complete = DATAIN_COMPLETE_NORMAL;
 497
 498         return 0;
 499
 500 out:
 501         return ret;
 502 }
 503
 504 static int
 505 cxgbit_tx_datain(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
 506                  const struct iscsi_datain *datain)
 507 {
 508         struct sk_buff *skb;
 509         int ret = 0;
 510
 511         skb = cxgbit_alloc_skb(csk, 0);
 512         if (unlikely(!skb))
 513                 return -ENOMEM;
 514
 515         memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
 516
 517         if (datain->length) {
 518                 cxgbit_skcb_submode(skb) |= (csk->submode &
 519                                 CXGBIT_SUBMODE_DCRC);
 520                 cxgbit_skcb_tx_extralen(skb) =
 521                                 cxgbit_digest_len[cxgbit_skcb_submode(skb)];
 522         }
 523
 524         ret = cxgbit_map_skb(cmd, skb, datain->offset, datain->length);
 525         if (ret < 0) {
 526                 __kfree_skb(skb);
 527                 return ret;
 528         }
 529
 530         return cxgbit_queue_skb(csk, skb);
 531 }
 532
 533 static int
 534 cxgbit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 535                        struct iscsi_datain_req *dr,
 536                        const struct iscsi_datain *datain)
 537 {
 538         struct cxgbit_sock *csk = conn->context;
 539         u32 data_length = cmd->se_cmd.data_length;
 540         u32 padding = ((-data_length) & 3);
 541         u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
 542
 543         if ((data_length > mrdsl) && (!dr->recovery) &&
 544             (!padding) && (!datain->offset) && csk->max_iso_npdu) {
 545                 atomic_long_add(data_length - datain->length,
 546                                 &conn->sess->tx_data_octets);
 547                 return cxgbit_tx_datain_iso(csk, cmd, dr);
 548         }
 549
 550         return cxgbit_tx_datain(csk, cmd, datain);
 551 }
 552
 553 static int
 554 cxgbit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 555                           const void *data_buf, u32 data_buf_len)
 556 {
 557         struct cxgbit_sock *csk = conn->context;
 558         struct sk_buff *skb;
 559         u32 padding = ((-data_buf_len) & 3);
 560
 561         skb = cxgbit_alloc_skb(csk, data_buf_len + padding);
 562         if (unlikely(!skb))
 563                 return -ENOMEM;
 564
 565         memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
 566
 567         if (data_buf_len) {
 568                 u32 pad_bytes = 0;
 569
 570                 skb_store_bits(skb, ISCSI_HDR_LEN, data_buf, data_buf_len);
 571
 572                 if (padding)
 573                         skb_store_bits(skb, ISCSI_HDR_LEN + data_buf_len,
 574                                        &pad_bytes, padding);
 575         }
 576
 577         cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[
 578                                        cxgbit_skcb_submode(skb)];
 579
 580         return cxgbit_queue_skb(csk, skb);
 581 }
 582
 583 int
 584 cxgbit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 585                 struct iscsi_datain_req *dr, const void *buf, u32 buf_len)
 586 {
 587         if (dr)
 588                 return cxgbit_xmit_datain_pdu(conn, cmd, dr, buf);
 589         else
 590                 return cxgbit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 591 }
 592
 593 int cxgbit_validate_params(struct iscsi_conn *conn)
 594 {
 595         struct cxgbit_sock *csk = conn->context;
 596         struct cxgbit_device *cdev = csk->com.cdev;
 597         struct iscsi_param *param;
 598         u32 max_xmitdsl;
 599
 600         param = iscsi_find_param_from_key(MAXXMITDATASEGMENTLENGTH,
 601                                           conn->param_list);
 602         if (!param)
 603                 return -1;
 604
 605         if (kstrtou32(param->value, 0, &max_xmitdsl) < 0)
 606                 return -1;
 607
 608         if (max_xmitdsl > cdev->mdsl) {
 609                 if (iscsi_change_param_sprintf(
 610                         conn, "MaxXmitDataSegmentLength=%u", cdev->mdsl))
 611                         return -1;
 612         }
 613
 614         return 0;
 615 }
 616
 617 static int cxgbit_set_digest(struct cxgbit_sock *csk)
 618 {
 619         struct iscsi_conn *conn = csk->conn;
 620         struct iscsi_param *param;
 621
 622         param = iscsi_find_param_from_key(HEADERDIGEST, conn->param_list);
 623         if (!param) {
 624                 pr_err("param not found key %s\n", HEADERDIGEST);
 625                 return -1;
 626         }
 627
 628         if (!strcmp(param->value, CRC32C))
 629                 csk->submode |= CXGBIT_SUBMODE_HCRC;
 630
 631         param = iscsi_find_param_from_key(DATADIGEST, conn->param_list);
 632         if (!param) {
 633                 csk->submode = 0;
 634                 pr_err("param not found key %s\n", DATADIGEST);
 635                 return -1;
 636         }
 637
 638         if (!strcmp(param->value, CRC32C))
 639                 csk->submode |= CXGBIT_SUBMODE_DCRC;
 640
 641         if (cxgbit_setup_conn_digest(csk)) {
 642                 csk->submode = 0;
 643                 return -1;
 644         }
 645
 646         return 0;
 647 }
 648
 649 static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
 650 {
 651         struct iscsi_conn *conn = csk->conn;
 652         struct iscsi_conn_ops *conn_ops = conn->conn_ops;
 653         struct iscsi_param *param;
 654         u32 mrdsl, mbl;
 655         u32 max_npdu, max_iso_npdu;
 656
 657         if (conn->login->leading_connection) {
 658                 param = iscsi_find_param_from_key(MAXBURSTLENGTH,
 659                                                   conn->param_list);
 660                 if (!param) {
 661                         pr_err("param not found key %s\n", MAXBURSTLENGTH);
 662                         return -1;
 663                 }
 664
 665                 if (kstrtou32(param->value, 0, &mbl) < 0)
 666                         return -1;
 667         } else {
 668                 mbl = conn->sess->sess_ops->MaxBurstLength;
 669         }
 670
 671         mrdsl = conn_ops->MaxRecvDataSegmentLength;
 672         max_npdu = mbl / mrdsl;
 673
 674         max_iso_npdu = CXGBIT_MAX_ISO_PAYLOAD /
 675                         (ISCSI_HDR_LEN + mrdsl +
 676                         cxgbit_digest_len[csk->submode]);
 677
 678         csk->max_iso_npdu = min(max_npdu, max_iso_npdu);
 679
 680         if (csk->max_iso_npdu <= 1)
 681                 csk->max_iso_npdu = 0;
 682
 683         return 0;
 684 }
 685
 686 /*
 687  * cxgbit_seq_pdu_inorder()
 688  * @csk: pointer to cxgbit socket structure
 689  *
 690  * This function checks whether data sequence and data
 691  * pdu are in order.
 692  *
 693  * Return: returns -1 on error, 0 if data sequence and
 694  * data pdu are in order, 1 if data sequence or data pdu
 695  * is not in order.
 696  */
 697 static int cxgbit_seq_pdu_inorder(struct cxgbit_sock *csk)
 698 {
 699         struct iscsi_conn *conn = csk->conn;
 700         struct iscsi_param *param;
 701
 702         if (conn->login->leading_connection) {
 703                 param = iscsi_find_param_from_key(DATASEQUENCEINORDER,
 704                                                   conn->param_list);
 705                 if (!param) {
 706                         pr_err("param not found key %s\n", DATASEQUENCEINORDER);
 707                         return -1;
 708                 }
 709
 710                 if (strcmp(param->value, YES))
 711                         return 1;
 712
 713                 param = iscsi_find_param_from_key(DATAPDUINORDER,
 714                                                   conn->param_list);
 715                 if (!param) {
 716                         pr_err("param not found key %s\n", DATAPDUINORDER);
 717                         return -1;
 718                 }
 719
 720                 if (strcmp(param->value, YES))
 721                         return 1;
 722
 723         } else {
 724                 if (!conn->sess->sess_ops->DataSequenceInOrder)
 725                         return 1;
 726                 if (!conn->sess->sess_ops->DataPDUInOrder)
 727                         return 1;
 728         }
 729
 730         return 0;
 731 }
 732
 733 static int cxgbit_set_params(struct iscsi_conn *conn)
 734 {
 735         struct cxgbit_sock *csk = conn->context;
 736         struct cxgbit_device *cdev = csk->com.cdev;
 737         struct cxgbi_ppm *ppm = *csk->com.cdev->lldi.iscsi_ppm;
 738         struct iscsi_conn_ops *conn_ops = conn->conn_ops;
 739         struct iscsi_param *param;
 740         u8 erl;
 741
 742         if (conn_ops->MaxRecvDataSegmentLength > cdev->mdsl)
 743                 conn_ops->MaxRecvDataSegmentLength = cdev->mdsl;
 744
 745         if (conn->login->leading_connection) {
 746                 param = iscsi_find_param_from_key(ERRORRECOVERYLEVEL,
 747                                                   conn->param_list);
 748                 if (!param) {
 749                         pr_err("param not found key %s\n", ERRORRECOVERYLEVEL);
 750                         return -1;
 751                 }
 752                 if (kstrtou8(param->value, 0, &erl) < 0)
 753                         return -1;
 754         } else {
 755                 erl = conn->sess->sess_ops->ErrorRecoveryLevel;
 756         }
 757
 758         if (!erl) {
 759                 int ret;
 760
 761                 ret = cxgbit_seq_pdu_inorder(csk);
 762                 if (ret < 0) {
 763                         return -1;
 764                 } else if (ret > 0) {
 765                         if (is_t5(cdev->lldi.adapter_type))
 766                                 goto enable_ddp;
 767                         else
 768                                 goto enable_digest;
 769                 }
 770
 771                 if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) {
 772                         if (cxgbit_set_iso_npdu(csk))
 773                                 return -1;
 774                 }
 775
 776 enable_ddp:
 777                 if (test_bit(CDEV_DDP_ENABLE, &cdev->flags)) {
 778                         if (cxgbit_setup_conn_pgidx(csk,
 779                                                     ppm->tformat.pgsz_idx_dflt))
 780                                 return -1;
 781                         set_bit(CSK_DDP_ENABLE, &csk->com.flags);
 782                 }
 783         }
 784
 785 enable_digest:
 786         if (cxgbit_set_digest(csk))
 787                 return -1;
 788
 789         return 0;
 790 }
 791
 792 int
 793 cxgbit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 794                     u32 length)
 795 {
 796         struct cxgbit_sock *csk = conn->context;
 797         struct sk_buff *skb;
 798         u32 padding_buf = 0;
 799         u8 padding = ((-length) & 3);
 800
 801         skb = cxgbit_alloc_skb(csk, length + padding);
 802         if (!skb)
 803                 return -ENOMEM;
 804         skb_store_bits(skb, 0, login->rsp, ISCSI_HDR_LEN);
 805         skb_store_bits(skb, ISCSI_HDR_LEN, login->rsp_buf, length);
 806
 807         if (padding)
 808                 skb_store_bits(skb, ISCSI_HDR_LEN + length,
 809                                &padding_buf, padding);
 810
 811         if (login->login_complete) {
 812                 if (cxgbit_set_params(conn)) {
 813                         kfree_skb(skb);
 814                         return -1;
 815                 }
 816
 817                 set_bit(CSK_LOGIN_DONE, &csk->com.flags);
 818         }
 819
 820         if (cxgbit_queue_skb(csk, skb))
 821                 return -1;
 822
 823         if ((!login->login_complete) && (!login->login_failed))
 824                 schedule_delayed_work(&conn->login_work, 0);
 825
 826         return 0;
 827 }
 828
 829 static void
 830 cxgbit_skb_copy_to_sg(struct sk_buff *skb, struct scatterlist *sg,
 831                       unsigned int nents)
 832 {
 833         struct skb_seq_state st;
 834         const u8 *buf;
 835         unsigned int consumed = 0, buf_len;
 836         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(skb);
 837
 838         skb_prepare_seq_read(skb, pdu_cb->doffset,
 839                              pdu_cb->doffset + pdu_cb->dlen,
 840                              &st);
 841
 842         while (true) {
 843                 buf_len = skb_seq_read(consumed, &buf, &st);
 844                 if (!buf_len) {
 845                         skb_abort_seq_read(&st);
 846                         break;
 847                 }
 848
 849                 consumed += sg_pcopy_from_buffer(sg, nents, (void *)buf,
 850                                                  buf_len, consumed);
 851         }
 852 }
 853
 854 static struct iscsi_cmd *cxgbit_allocate_cmd(struct cxgbit_sock *csk)
 855 {
 856         struct iscsi_conn *conn = csk->conn;
 857         struct cxgbi_ppm *ppm = cdev2ppm(csk->com.cdev);
 858         struct cxgbit_cmd *ccmd;
 859         struct iscsi_cmd *cmd;
 860
 861         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 862         if (!cmd) {
 863                 pr_err("Unable to allocate iscsi_cmd + cxgbit_cmd\n");
 864                 return NULL;
 865         }
 866
 867         ccmd = iscsit_priv_cmd(cmd);
 868         ccmd->ttinfo.tag = ppm->tformat.no_ddp_mask;
 869         ccmd->setup_ddp = true;
 870
 871         return cmd;
 872 }
 873
 874 static int
 875 cxgbit_handle_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
 876                              u32 length)
 877 {
 878         struct iscsi_conn *conn = cmd->conn;
 879         struct cxgbit_sock *csk = conn->context;
 880         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
 881
 882         if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
 883                 pr_err("ImmediateData CRC32C DataDigest error\n");
 884                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
 885                         pr_err("Unable to recover from"
 886                                " Immediate Data digest failure while"
 887                                " in ERL=0.\n");
 888                         iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
 889                                           (unsigned char *)hdr);
 890                         return IMMEDIATE_DATA_CANNOT_RECOVER;
 891                 }
 892
 893                 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
 894                                   (unsigned char *)hdr);
 895                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
 896         }
 897
 898         if (cmd->se_cmd.se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
 899                 struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd);
 900                 struct skb_shared_info *ssi = skb_shinfo(csk->skb);
 901                 skb_frag_t *dfrag = &ssi->frags[pdu_cb->dfrag_idx];
 902
 903                 sg_init_table(&ccmd->sg, 1);
 904                 sg_set_page(&ccmd->sg, dfrag->page.p, skb_frag_size(dfrag),
 905                             dfrag->page_offset);
 906                 get_page(dfrag->page.p);
 907
 908                 cmd->se_cmd.t_data_sg = &ccmd->sg;
 909                 cmd->se_cmd.t_data_nents = 1;
 910
 911                 ccmd->release = true;
 912         } else {
 913                 struct scatterlist *sg = &cmd->se_cmd.t_data_sg[0];
 914                 u32 sg_nents = max(1UL, DIV_ROUND_UP(pdu_cb->dlen, PAGE_SIZE));
 915
 916                 cxgbit_skb_copy_to_sg(csk->skb, sg, sg_nents);
 917         }
 918
 919         cmd->write_data_done += pdu_cb->dlen;
 920
 921         if (cmd->write_data_done == cmd->se_cmd.data_length) {
 922                 spin_lock_bh(&cmd->istate_lock);
 923                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
 924                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
 925                 spin_unlock_bh(&cmd->istate_lock);
 926         }
 927
 928         return IMMEDIATE_DATA_NORMAL_OPERATION;
 929 }
 930
 931 static int
 932 cxgbit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
 933                           bool dump_payload)
 934 {
 935         struct iscsi_conn *conn = cmd->conn;
 936         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
 937         /*
 938          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
 939          */
 940         if (dump_payload)
 941                 goto after_immediate_data;
 942
 943         immed_ret = cxgbit_handle_immediate_data(cmd, hdr,
 944                                                  cmd->first_burst_len);
 945 after_immediate_data:
 946         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
 947                 /*
 948                  * A PDU/CmdSN carrying Immediate Data passed
 949                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
 950                  * Immediate Bit is not set.
 951                  */
 952                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
 953                                                 (unsigned char *)hdr,
 954                                                 hdr->cmdsn);
 955                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
 956                         return -1;
 957
 958                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
 959                         target_put_sess_cmd(&cmd->se_cmd);
 960                         return 0;
 961                 } else if (cmd->unsolicited_data) {
 962                         iscsit_set_unsoliticed_dataout(cmd);
 963                 }
 964
 965         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
 966                 /*
 967                  * Immediate Data failed DataCRC and ERL>=1,
 968                  * silently drop this PDU and let the initiator
 969                  * plug the CmdSN gap.
 970                  *
 971                  * FIXME: Send Unsolicited NOPIN with reserved
 972                  * TTT here to help the initiator figure out
 973                  * the missing CmdSN, although they should be
 974                  * intelligent enough to determine the missing
 975                  * CmdSN and issue a retry to plug the sequence.
 976                  */
 977                 cmd->i_state = ISTATE_REMOVE;
 978                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
 979         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
 980                 return -1;
 981
 982         return 0;
 983 }
 984
 985 static int
 986 cxgbit_handle_scsi_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
 987 {
 988         struct iscsi_conn *conn = csk->conn;
 989         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
 990         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)pdu_cb->hdr;
 991         int rc;
 992         bool dump_payload = false;
 993
 994         rc = iscsit_setup_scsi_cmd(conn, cmd, (unsigned char *)hdr);
 995         if (rc < 0)
 996                 return rc;
 997
 998         if (pdu_cb->dlen && (pdu_cb->dlen == cmd->se_cmd.data_length) &&
 999             (pdu_cb->nr_dfrags == 1))
1000                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1001
1002         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1003         if (rc < 0)
1004                 return 0;
1005         else if (rc > 0)
1006                 dump_payload = true;
1007
1008         if (!pdu_cb->dlen)
1009                 return 0;
1010
1011         return cxgbit_get_immediate_data(cmd, hdr, dump_payload);
1012 }
1013
1014 static int cxgbit_handle_iscsi_dataout(struct cxgbit_sock *csk)
1015 {
1016         struct scatterlist *sg_start;
1017         struct iscsi_conn *conn = csk->conn;
1018         struct iscsi_cmd *cmd = NULL;
1019         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1020         struct iscsi_data *hdr = (struct iscsi_data *)pdu_cb->hdr;
1021         u32 data_offset = be32_to_cpu(hdr->offset);
1022         u32 data_len = pdu_cb->dlen;
1023         int rc, sg_nents, sg_off;
1024         bool dcrc_err = false;
1025
1026         if (pdu_cb->flags & PDUCBF_RX_DDP_CMP) {
1027                 u32 offset = be32_to_cpu(hdr->offset);
1028                 u32 ddp_data_len;
1029                 u32 payload_length = ntoh24(hdr->dlength);
1030                 bool success = false;
1031
1032                 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 0);
1033                 if (!cmd)
1034                         return 0;
1035
1036                 ddp_data_len = offset - cmd->write_data_done;
1037                 atomic_long_add(ddp_data_len, &conn->sess->rx_data_octets);
1038
1039                 cmd->write_data_done = offset;
1040                 cmd->next_burst_len = ddp_data_len;
1041                 cmd->data_sn = be32_to_cpu(hdr->datasn);
1042
1043                 rc = __iscsit_check_dataout_hdr(conn, (unsigned char *)hdr,
1044                                                 cmd, payload_length, &success);
1045                 if (rc < 0)
1046                         return rc;
1047                 else if (!success)
1048                         return 0;
1049         } else {
1050                 rc = iscsit_check_dataout_hdr(conn, (unsigned char *)hdr, &cmd);
1051                 if (rc < 0)
1052                         return rc;
1053                 else if (!cmd)
1054                         return 0;
1055         }
1056
1057         if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1058                 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1059                        " DataSN: 0x%08x\n",
1060                        hdr->itt, hdr->offset, data_len,
1061                        hdr->datasn);
1062
1063                 dcrc_err = true;
1064                 goto check_payload;
1065         }
1066
1067         pr_debug("DataOut data_len: %u, "
1068                 "write_data_done: %u, data_length: %u\n",
1069                   data_len,  cmd->write_data_done,
1070                   cmd->se_cmd.data_length);
1071
1072         if (!(pdu_cb->flags & PDUCBF_RX_DATA_DDPD)) {
1073                 sg_off = data_offset / PAGE_SIZE;
1074                 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1075                 sg_nents = max(1UL, DIV_ROUND_UP(data_len, PAGE_SIZE));
1076
1077                 cxgbit_skb_copy_to_sg(csk->skb, sg_start, sg_nents);
1078         }
1079
1080 check_payload:
1081
1082         rc = iscsit_check_dataout_payload(cmd, hdr, dcrc_err);
1083         if (rc < 0)
1084                 return rc;
1085
1086         return 0;
1087 }
1088
1089 static int cxgbit_handle_nop_out(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
1090 {
1091         struct iscsi_conn *conn = csk->conn;
1092         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1093         struct iscsi_nopout *hdr = (struct iscsi_nopout *)pdu_cb->hdr;
1094         unsigned char *ping_data = NULL;
1095         u32 payload_length = pdu_cb->dlen;
1096         int ret;
1097
1098         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1099         if (ret < 0)
1100                 return 0;
1101
1102         if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1103                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1104                         pr_err("Unable to recover from"
1105                                " NOPOUT Ping DataCRC failure while in"
1106                                " ERL=0.\n");
1107                         ret = -1;
1108                         goto out;
1109                 } else {
1110                         /*
1111                          * drop this PDU and let the
1112                          * initiator plug the CmdSN gap.
1113                          */
1114                         pr_info("Dropping NOPOUT"
1115                                 " Command CmdSN: 0x%08x due to"
1116                                 " DataCRC error.\n", hdr->cmdsn);
1117                         ret = 0;
1118                         goto out;
1119                 }
1120         }
1121
1122         /*
1123          * Handle NOP-OUT payload for traditional iSCSI sockets
1124          */
1125         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1126                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1127                 if (!ping_data) {
1128                         pr_err("Unable to allocate memory for"
1129                                 " NOPOUT ping data.\n");
1130                         ret = -1;
1131                         goto out;
1132                 }
1133
1134                 skb_copy_bits(csk->skb, pdu_cb->doffset,
1135                               ping_data, payload_length);
1136
1137                 ping_data[payload_length] = '\0';
1138                 /*
1139                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1140                  */
1141                 cmd->buf_ptr = ping_data;
1142                 cmd->buf_ptr_size = payload_length;
1143
1144                 pr_debug("Got %u bytes of NOPOUT ping"
1145                         " data.\n", payload_length);
1146                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1147         }
1148
1149         return iscsit_process_nop_out(conn, cmd, hdr);
1150 out:
1151         if (cmd)
1152                 iscsit_free_cmd(cmd, false);
1153         return ret;
1154 }
1155
1156 static int
1157 cxgbit_handle_text_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
1158 {
1159         struct iscsi_conn *conn = csk->conn;
1160         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1161         struct iscsi_text *hdr = (struct iscsi_text *)pdu_cb->hdr;
1162         u32 payload_length = pdu_cb->dlen;
1163         int rc;
1164         unsigned char *text_in = NULL;
1165
1166         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1167         if (rc < 0)
1168                 return rc;
1169
1170         if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
1171                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1172                         pr_err("Unable to recover from"
1173                                " Text Data digest failure while in"
1174                                " ERL=0.\n");
1175                         goto reject;
1176                 } else {
1177                         /*
1178                          * drop this PDU and let the
1179                          * initiator plug the CmdSN gap.
1180                          */
1181                         pr_info("Dropping Text"
1182                                 " Command CmdSN: 0x%08x due to"
1183                                 " DataCRC error.\n", hdr->cmdsn);
1184                         return 0;
1185                 }
1186         }
1187
1188         if (payload_length) {
1189                 text_in = kzalloc(payload_length, GFP_KERNEL);
1190                 if (!text_in) {
1191                         pr_err("Unable to allocate text_in of payload_length: %u\n",
1192                                payload_length);
1193                         return -ENOMEM;
1194                 }
1195                 skb_copy_bits(csk->skb, pdu_cb->doffset,
1196                               text_in, payload_length);
1197
1198                 text_in[payload_length - 1] = '\0';
1199
1200                 cmd->text_in_ptr = text_in;
1201         }
1202
1203         return iscsit_process_text_cmd(conn, cmd, hdr);
1204
1205 reject:
1206         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1207                                  pdu_cb->hdr);
1208 }
1209
1210 static int cxgbit_target_rx_opcode(struct cxgbit_sock *csk)
1211 {
1212         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1213         struct iscsi_hdr *hdr = (struct iscsi_hdr *)pdu_cb->hdr;
1214         struct iscsi_conn *conn = csk->conn;
1215         struct iscsi_cmd *cmd = NULL;
1216         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1217         int ret = -EINVAL;
1218
1219         switch (opcode) {
1220         case ISCSI_OP_SCSI_CMD:
1221                 cmd = cxgbit_allocate_cmd(csk);
1222                 if (!cmd)
1223                         goto reject;
1224
1225                 ret = cxgbit_handle_scsi_cmd(csk, cmd);
1226                 break;
1227         case ISCSI_OP_SCSI_DATA_OUT:
1228                 ret = cxgbit_handle_iscsi_dataout(csk);
1229                 break;
1230         case ISCSI_OP_NOOP_OUT:
1231                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1232                         cmd = cxgbit_allocate_cmd(csk);
1233                         if (!cmd)
1234                                 goto reject;
1235                 }
1236
1237                 ret = cxgbit_handle_nop_out(csk, cmd);
1238                 break;
1239         case ISCSI_OP_SCSI_TMFUNC:
1240                 cmd = cxgbit_allocate_cmd(csk);
1241                 if (!cmd)
1242                         goto reject;
1243
1244                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1245                                                  (unsigned char *)hdr);
1246                 break;
1247         case ISCSI_OP_TEXT:
1248                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1249                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1250                         if (!cmd)
1251                                 goto reject;
1252                 } else {
1253                         cmd = cxgbit_allocate_cmd(csk);
1254                         if (!cmd)
1255                                 goto reject;
1256                 }
1257
1258                 ret = cxgbit_handle_text_cmd(csk, cmd);
1259                 break;
1260         case ISCSI_OP_LOGOUT:
1261                 cmd = cxgbit_allocate_cmd(csk);
1262                 if (!cmd)
1263                         goto reject;
1264
1265                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1266                 if (ret > 0)
1267                         wait_for_completion_timeout(&conn->conn_logout_comp,
1268                                                     SECONDS_FOR_LOGOUT_COMP
1269                                                     * HZ);
1270                 break;
1271         case ISCSI_OP_SNACK:
1272                 ret = iscsit_handle_snack(conn, (unsigned char *)hdr);
1273                 break;
1274         default:
1275                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1276                 dump_stack();
1277                 break;
1278         }
1279
1280         return ret;
1281
1282 reject:
1283         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1284                                  (unsigned char *)hdr);
1285         return ret;
1286 }
1287
1288 static int cxgbit_rx_opcode(struct cxgbit_sock *csk)
1289 {
1290         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1291         struct iscsi_conn *conn = csk->conn;
1292         struct iscsi_hdr *hdr = pdu_cb->hdr;
1293         u8 opcode;
1294
1295         if (pdu_cb->flags & PDUCBF_RX_HCRC_ERR) {
1296                 atomic_long_inc(&conn->sess->conn_digest_errors);
1297                 goto transport_err;
1298         }
1299
1300         if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
1301                 goto transport_err;
1302
1303         opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1304
1305         if (conn->sess->sess_ops->SessionType &&
1306             ((!(opcode & ISCSI_OP_TEXT)) ||
1307              (!(opcode & ISCSI_OP_LOGOUT)))) {
1308                 pr_err("Received illegal iSCSI Opcode: 0x%02x"
1309                         " while in Discovery Session, rejecting.\n", opcode);
1310                 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1311                                   (unsigned char *)hdr);
1312                 goto transport_err;
1313         }
1314
1315         if (cxgbit_target_rx_opcode(csk) < 0)
1316                 goto transport_err;
1317
1318         return 0;
1319
1320 transport_err:
1321         return -1;
1322 }
1323
1324 static int cxgbit_rx_login_pdu(struct cxgbit_sock *csk)
1325 {
1326         struct iscsi_conn *conn = csk->conn;
1327         struct iscsi_login *login = conn->login;
1328         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
1329         struct iscsi_login_req *login_req;
1330
1331         login_req = (struct iscsi_login_req *)login->req;
1332         memcpy(login_req, pdu_cb->hdr, sizeof(*login_req));
1333
1334         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1335                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1336                 login_req->flags, login_req->itt, login_req->cmdsn,
1337                 login_req->exp_statsn, login_req->cid, pdu_cb->dlen);
1338         /*
1339          * Setup the initial iscsi_login values from the leading
1340          * login request PDU.
1341          */
1342         if (login->first_request) {
1343                 login_req = (struct iscsi_login_req *)login->req;
1344                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1345                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(
1346                                 login_req->flags);
1347                 login->version_min      = login_req->min_version;
1348                 login->version_max      = login_req->max_version;
1349                 memcpy(login->isid, login_req->isid, 6);
1350                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1351                 login->init_task_tag    = login_req->itt;
1352                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1353                 login->cid              = be16_to_cpu(login_req->cid);
1354                 login->tsih             = be16_to_cpu(login_req->tsih);
1355         }
1356
1357         if (iscsi_target_check_login_request(conn, login) < 0)
1358                 return -1;
1359
1360         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1361         skb_copy_bits(csk->skb, pdu_cb->doffset, login->req_buf, pdu_cb->dlen);
1362
1363         return 0;
1364 }
1365
1366 static int
1367 cxgbit_process_iscsi_pdu(struct cxgbit_sock *csk, struct sk_buff *skb, int idx)
1368 {
1369         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, idx);
1370         int ret;
1371
1372         cxgbit_rx_pdu_cb(skb) = pdu_cb;
1373
1374         csk->skb = skb;
1375
1376         if (!test_bit(CSK_LOGIN_DONE, &csk->com.flags)) {
1377                 ret = cxgbit_rx_login_pdu(csk);
1378                 set_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
1379         } else {
1380                 ret = cxgbit_rx_opcode(csk);
1381         }
1382
1383         return ret;
1384 }
1385
1386 static void cxgbit_lro_skb_dump(struct sk_buff *skb)
1387 {
1388         struct skb_shared_info *ssi = skb_shinfo(skb);
1389         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1390         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1391         u8 i;
1392
1393         pr_info("skb 0x%p, head 0x%p, 0x%p, len %u,%u, frags %u.\n",
1394                 skb, skb->head, skb->data, skb->len, skb->data_len,
1395                 ssi->nr_frags);
1396         pr_info("skb 0x%p, lro_cb, csk 0x%p, pdu %u, %u.\n",
1397                 skb, lro_cb->csk, lro_cb->pdu_idx, lro_cb->pdu_totallen);
1398
1399         for (i = 0; i < lro_cb->pdu_idx; i++, pdu_cb++)
1400                 pr_info("skb 0x%p, pdu %d, %u, f 0x%x, seq 0x%x, dcrc 0x%x, "
1401                         "frags %u.\n",
1402                         skb, i, pdu_cb->pdulen, pdu_cb->flags, pdu_cb->seq,
1403                         pdu_cb->ddigest, pdu_cb->frags);
1404         for (i = 0; i < ssi->nr_frags; i++)
1405                 pr_info("skb 0x%p, frag %d, off %u, sz %u.\n",
1406                         skb, i, ssi->frags[i].page_offset, ssi->frags[i].size);
1407 }
1408
1409 static void cxgbit_lro_hskb_reset(struct cxgbit_sock *csk)
1410 {
1411         struct sk_buff *skb = csk->lro_hskb;
1412         struct skb_shared_info *ssi = skb_shinfo(skb);
1413         u8 i;
1414
1415         memset(skb->data, 0, LRO_SKB_MIN_HEADROOM);
1416         for (i = 0; i < ssi->nr_frags; i++)
1417                 put_page(skb_frag_page(&ssi->frags[i]));
1418         ssi->nr_frags = 0;
1419         skb->data_len = 0;
1420         skb->truesize -= skb->len;
1421         skb->len = 0;
1422 }
1423
1424 static void
1425 cxgbit_lro_skb_merge(struct cxgbit_sock *csk, struct sk_buff *skb, u8 pdu_idx)
1426 {
1427         struct sk_buff *hskb = csk->lro_hskb;
1428         struct cxgbit_lro_pdu_cb *hpdu_cb = cxgbit_skb_lro_pdu_cb(hskb, 0);
1429         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, pdu_idx);
1430         struct skb_shared_info *hssi = skb_shinfo(hskb);
1431         struct skb_shared_info *ssi = skb_shinfo(skb);
1432         unsigned int len = 0;
1433
1434         if (pdu_cb->flags & PDUCBF_RX_HDR) {
1435                 u8 hfrag_idx = hssi->nr_frags;
1436
1437                 hpdu_cb->flags |= pdu_cb->flags;
1438                 hpdu_cb->seq = pdu_cb->seq;
1439                 hpdu_cb->hdr = pdu_cb->hdr;
1440                 hpdu_cb->hlen = pdu_cb->hlen;
1441
1442                 memcpy(&hssi->frags[hfrag_idx], &ssi->frags[pdu_cb->hfrag_idx],
1443                        sizeof(skb_frag_t));
1444
1445                 get_page(skb_frag_page(&hssi->frags[hfrag_idx]));
1446                 hssi->nr_frags++;
1447                 hpdu_cb->frags++;
1448                 hpdu_cb->hfrag_idx = hfrag_idx;
1449
1450                 len = hssi->frags[hfrag_idx].size;
1451                 hskb->len += len;
1452                 hskb->data_len += len;
1453                 hskb->truesize += len;
1454         }
1455
1456         if (pdu_cb->flags & PDUCBF_RX_DATA) {
1457                 u8 dfrag_idx = hssi->nr_frags, i;
1458
1459                 hpdu_cb->flags |= pdu_cb->flags;
1460                 hpdu_cb->dfrag_idx = dfrag_idx;
1461
1462                 len = 0;
1463                 for (i = 0; i < pdu_cb->nr_dfrags; dfrag_idx++, i++) {
1464                         memcpy(&hssi->frags[dfrag_idx],
1465                                &ssi->frags[pdu_cb->dfrag_idx + i],
1466                                sizeof(skb_frag_t));
1467
1468                         get_page(skb_frag_page(&hssi->frags[dfrag_idx]));
1469
1470                         len += hssi->frags[dfrag_idx].size;
1471
1472                         hssi->nr_frags++;
1473                         hpdu_cb->frags++;
1474                 }
1475
1476                 hpdu_cb->dlen = pdu_cb->dlen;
1477                 hpdu_cb->doffset = hpdu_cb->hlen;
1478                 hpdu_cb->nr_dfrags = pdu_cb->nr_dfrags;
1479                 hskb->len += len;
1480                 hskb->data_len += len;
1481                 hskb->truesize += len;
1482         }
1483
1484         if (pdu_cb->flags & PDUCBF_RX_STATUS) {
1485                 hpdu_cb->flags |= pdu_cb->flags;
1486
1487                 if (hpdu_cb->flags & PDUCBF_RX_DATA)
1488                         hpdu_cb->flags &= ~PDUCBF_RX_DATA_DDPD;
1489
1490                 hpdu_cb->ddigest = pdu_cb->ddigest;
1491                 hpdu_cb->pdulen = pdu_cb->pdulen;
1492         }
1493 }
1494
1495 static int cxgbit_process_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1496 {
1497         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1498         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1499         u8 pdu_idx = 0, last_idx = 0;
1500         int ret = 0;
1501
1502         if (!pdu_cb->complete) {
1503                 cxgbit_lro_skb_merge(csk, skb, 0);
1504
1505                 if (pdu_cb->flags & PDUCBF_RX_STATUS) {
1506                         struct sk_buff *hskb = csk->lro_hskb;
1507
1508                         ret = cxgbit_process_iscsi_pdu(csk, hskb, 0);
1509
1510                         cxgbit_lro_hskb_reset(csk);
1511
1512                         if (ret < 0)
1513                                 goto out;
1514                 }
1515
1516                 pdu_idx = 1;
1517         }
1518
1519         if (lro_cb->pdu_idx)
1520                 last_idx = lro_cb->pdu_idx - 1;
1521
1522         for (; pdu_idx <= last_idx; pdu_idx++) {
1523                 ret = cxgbit_process_iscsi_pdu(csk, skb, pdu_idx);
1524                 if (ret < 0)
1525                         goto out;
1526         }
1527
1528         if ((!lro_cb->complete) && lro_cb->pdu_idx)
1529                 cxgbit_lro_skb_merge(csk, skb, lro_cb->pdu_idx);
1530
1531 out:
1532         return ret;
1533 }
1534
1535 static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1536 {
1537         struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
1538         struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
1539         int ret = -1;
1540
1541         if ((pdu_cb->flags & PDUCBF_RX_HDR) &&
1542             (pdu_cb->seq != csk->rcv_nxt)) {
1543                 pr_info("csk 0x%p, tid 0x%x, seq 0x%x != 0x%x.\n",
1544                         csk, csk->tid, pdu_cb->seq, csk->rcv_nxt);
1545                 cxgbit_lro_skb_dump(skb);
1546                 return ret;
1547         }
1548
1549         csk->rcv_nxt += lro_cb->pdu_totallen;
1550
1551         ret = cxgbit_process_lro_skb(csk, skb);
1552
1553         csk->rx_credits += lro_cb->pdu_totallen;
1554
1555         if (csk->rx_credits >= (csk->rcv_win / 4))
1556                 cxgbit_rx_data_ack(csk);
1557
1558         return ret;
1559 }
1560
1561 static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
1562 {
1563         struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
1564         int ret = -1;
1565
1566         if (likely(cxgbit_skcb_flags(skb) & SKCBF_RX_LRO)) {
1567                 if (is_t5(lldi->adapter_type))
1568                         ret = cxgbit_rx_lro_skb(csk, skb);
1569                 else
1570                         ret = cxgbit_process_lro_skb(csk, skb);
1571         }
1572
1573         __kfree_skb(skb);
1574         return ret;
1575 }
1576
1577 static bool cxgbit_rxq_len(struct cxgbit_sock *csk, struct sk_buff_head *rxq)
1578 {
1579         spin_lock_bh(&csk->rxq.lock);
1580         if (skb_queue_len(&csk->rxq)) {
1581                 skb_queue_splice_init(&csk->rxq, rxq);
1582                 spin_unlock_bh(&csk->rxq.lock);
1583                 return true;
1584         }
1585         spin_unlock_bh(&csk->rxq.lock);
1586         return false;
1587 }
1588
1589 static int cxgbit_wait_rxq(struct cxgbit_sock *csk)
1590 {
1591         struct sk_buff *skb;
1592         struct sk_buff_head rxq;
1593
1594         skb_queue_head_init(&rxq);
1595
1596         wait_event_interruptible(csk->waitq, cxgbit_rxq_len(csk, &rxq));
1597
1598         if (signal_pending(current))
1599                 goto out;
1600
1601         while ((skb = __skb_dequeue(&rxq))) {
1602                 if (cxgbit_rx_skb(csk, skb))
1603                         goto out;
1604         }
1605
1606         return 0;
1607 out:
1608         __skb_queue_purge(&rxq);
1609         return -1;
1610 }
1611
1612 int cxgbit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1613 {
1614         struct cxgbit_sock *csk = conn->context;
1615         int ret = -1;
1616
1617         while (!test_and_clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags)) {
1618                 ret = cxgbit_wait_rxq(csk);
1619                 if (ret) {
1620                         clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
1621                         break;
1622                 }
1623         }
1624
1625         return ret;
1626 }
1627
1628 void cxgbit_get_rx_pdu(struct iscsi_conn *conn)
1629 {
1630         struct cxgbit_sock *csk = conn->context;
1631
1632         while (!kthread_should_stop()) {
1633                 iscsit_thread_check_cpumask(conn, current, 0);
1634                 if (cxgbit_wait_rxq(csk))
1635                         return;
1636         }
1637 }