1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2016 Chelsio Communications, Inc. 4 */ 5 6 #include <linux/workqueue.h> 7 #include <linux/kthread.h> 8 #include <linux/sched/signal.h> 9 10 #include <asm/unaligned.h> 11 #include <net/tcp.h> 12 #include <target/target_core_base.h> 13 #include <target/target_core_fabric.h> 14 #include "cxgbit.h" 15 16 struct sge_opaque_hdr { 17 void *dev; 18 dma_addr_t addr[MAX_SKB_FRAGS + 1]; 19 }; 20 21 static const u8 cxgbit_digest_len[] = {0, 4, 4, 8}; 22 23 #define TX_HDR_LEN (sizeof(struct sge_opaque_hdr) + \ 24 sizeof(struct fw_ofld_tx_data_wr)) 25 26 static struct sk_buff * 27 __cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len, bool iso) 28 { 29 struct sk_buff *skb = NULL; 30 u8 submode = 0; 31 int errcode; 32 static const u32 hdr_len = TX_HDR_LEN + ISCSI_HDR_LEN; 33 34 if (len) { 35 skb = alloc_skb_with_frags(hdr_len, len, 36 0, &errcode, 37 GFP_KERNEL); 38 if (!skb) 39 return NULL; 40 41 skb_reserve(skb, TX_HDR_LEN); 42 skb_reset_transport_header(skb); 43 __skb_put(skb, ISCSI_HDR_LEN); 44 skb->data_len = len; 45 skb->len += len; 46 submode |= (csk->submode & CXGBIT_SUBMODE_DCRC); 47 48 } else { 49 u32 iso_len = iso ? sizeof(struct cpl_tx_data_iso) : 0; 50 51 skb = alloc_skb(hdr_len + iso_len, GFP_KERNEL); 52 if (!skb) 53 return NULL; 54 55 skb_reserve(skb, TX_HDR_LEN + iso_len); 56 skb_reset_transport_header(skb); 57 __skb_put(skb, ISCSI_HDR_LEN); 58 } 59 60 submode |= (csk->submode & CXGBIT_SUBMODE_HCRC); 61 cxgbit_skcb_submode(skb) = submode; 62 cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[submode]; 63 cxgbit_skcb_flags(skb) |= SKCBF_TX_NEED_HDR; 64 return skb; 65 } 66 67 static struct sk_buff *cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len) 68 { 69 return __cxgbit_alloc_skb(csk, len, false); 70 } 71 72 /* 73 * cxgbit_is_ofld_imm - check whether a packet can be sent as immediate data 74 * @skb: the packet 75 * 76 * Returns true if a packet can be sent as an offload WR with immediate 77 * data. We currently use the same limit as for Ethernet packets. 78 */ 79 static int cxgbit_is_ofld_imm(const struct sk_buff *skb) 80 { 81 int length = skb->len; 82 83 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) 84 length += sizeof(struct fw_ofld_tx_data_wr); 85 86 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_ISO)) 87 length += sizeof(struct cpl_tx_data_iso); 88 89 #define MAX_IMM_TX_PKT_LEN 256 90 return length <= MAX_IMM_TX_PKT_LEN; 91 } 92 93 /* 94 * cxgbit_sgl_len - calculates the size of an SGL of the given capacity 95 * @n: the number of SGL entries 96 * Calculates the number of flits needed for a scatter/gather list that 97 * can hold the given number of entries. 98 */ 99 static inline unsigned int cxgbit_sgl_len(unsigned int n) 100 { 101 n--; 102 return (3 * n) / 2 + (n & 1) + 2; 103 } 104 105 /* 106 * cxgbit_calc_tx_flits_ofld - calculate # of flits for an offload packet 107 * @skb: the packet 108 * 109 * Returns the number of flits needed for the given offload packet. 110 * These packets are already fully constructed and no additional headers 111 * will be added. 112 */ 113 static unsigned int cxgbit_calc_tx_flits_ofld(const struct sk_buff *skb) 114 { 115 unsigned int flits, cnt; 116 117 if (cxgbit_is_ofld_imm(skb)) 118 return DIV_ROUND_UP(skb->len, 8); 119 flits = skb_transport_offset(skb) / 8; 120 cnt = skb_shinfo(skb)->nr_frags; 121 if (skb_tail_pointer(skb) != skb_transport_header(skb)) 122 cnt++; 123 return flits + cxgbit_sgl_len(cnt); 124 } 125 126 #define CXGBIT_ISO_FSLICE 0x1 127 #define CXGBIT_ISO_LSLICE 0x2 128 static void 129 cxgbit_cpl_tx_data_iso(struct sk_buff *skb, struct cxgbit_iso_info *iso_info) 130 { 131 struct cpl_tx_data_iso *cpl; 132 unsigned int submode = cxgbit_skcb_submode(skb); 133 unsigned int fslice = !!(iso_info->flags & CXGBIT_ISO_FSLICE); 134 unsigned int lslice = !!(iso_info->flags & CXGBIT_ISO_LSLICE); 135 136 cpl = __skb_push(skb, sizeof(*cpl)); 137 138 cpl->op_to_scsi = htonl(CPL_TX_DATA_ISO_OP_V(CPL_TX_DATA_ISO) | 139 CPL_TX_DATA_ISO_FIRST_V(fslice) | 140 CPL_TX_DATA_ISO_LAST_V(lslice) | 141 CPL_TX_DATA_ISO_CPLHDRLEN_V(0) | 142 CPL_TX_DATA_ISO_HDRCRC_V(submode & 1) | 143 CPL_TX_DATA_ISO_PLDCRC_V(((submode >> 1) & 1)) | 144 CPL_TX_DATA_ISO_IMMEDIATE_V(0) | 145 CPL_TX_DATA_ISO_SCSI_V(2)); 146 147 cpl->ahs_len = 0; 148 cpl->mpdu = htons(DIV_ROUND_UP(iso_info->mpdu, 4)); 149 cpl->burst_size = htonl(DIV_ROUND_UP(iso_info->burst_len, 4)); 150 cpl->len = htonl(iso_info->len); 151 cpl->reserved2_seglen_offset = htonl(0); 152 cpl->datasn_offset = htonl(0); 153 cpl->buffer_offset = htonl(0); 154 cpl->reserved3 = 0; 155 156 __skb_pull(skb, sizeof(*cpl)); 157 } 158 159 static void 160 cxgbit_tx_data_wr(struct cxgbit_sock *csk, struct sk_buff *skb, u32 dlen, 161 u32 len, u32 credits, u32 compl) 162 { 163 struct fw_ofld_tx_data_wr *req; 164 const struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi; 165 u32 submode = cxgbit_skcb_submode(skb); 166 u32 wr_ulp_mode = 0; 167 u32 hdr_size = sizeof(*req); 168 u32 opcode = FW_OFLD_TX_DATA_WR; 169 u32 immlen = 0; 170 u32 force = is_t5(lldi->adapter_type) ? TX_FORCE_V(!submode) : 171 T6_TX_FORCE_F; 172 173 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO) { 174 opcode = FW_ISCSI_TX_DATA_WR; 175 immlen += sizeof(struct cpl_tx_data_iso); 176 hdr_size += sizeof(struct cpl_tx_data_iso); 177 submode |= 8; 178 } 179 180 if (cxgbit_is_ofld_imm(skb)) 181 immlen += dlen; 182 183 req = __skb_push(skb, hdr_size); 184 req->op_to_immdlen = cpu_to_be32(FW_WR_OP_V(opcode) | 185 FW_WR_COMPL_V(compl) | 186 FW_WR_IMMDLEN_V(immlen)); 187 req->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(csk->tid) | 188 FW_WR_LEN16_V(credits)); 189 req->plen = htonl(len); 190 wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP_MODE_ISCSI) | 191 FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode); 192 193 req->tunnel_to_proxy = htonl((wr_ulp_mode) | force | 194 FW_OFLD_TX_DATA_WR_SHOVE_V(skb_peek(&csk->txq) ? 0 : 1)); 195 } 196 197 static void cxgbit_arp_failure_skb_discard(void *handle, struct sk_buff *skb) 198 { 199 kfree_skb(skb); 200 } 201 202 void cxgbit_push_tx_frames(struct cxgbit_sock *csk) 203 { 204 struct sk_buff *skb; 205 206 while (csk->wr_cred && ((skb = skb_peek(&csk->txq)) != NULL)) { 207 u32 dlen = skb->len; 208 u32 len = skb->len; 209 u32 credits_needed; 210 u32 compl = 0; 211 u32 flowclen16 = 0; 212 u32 iso_cpl_len = 0; 213 214 if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO) 215 iso_cpl_len = sizeof(struct cpl_tx_data_iso); 216 217 if (cxgbit_is_ofld_imm(skb)) 218 credits_needed = DIV_ROUND_UP(dlen + iso_cpl_len, 16); 219 else 220 credits_needed = DIV_ROUND_UP((8 * 221 cxgbit_calc_tx_flits_ofld(skb)) + 222 iso_cpl_len, 16); 223 224 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) 225 credits_needed += DIV_ROUND_UP( 226 sizeof(struct fw_ofld_tx_data_wr), 16); 227 /* 228 * Assumes the initial credits is large enough to support 229 * fw_flowc_wr plus largest possible first payload 230 */ 231 232 if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags)) { 233 flowclen16 = cxgbit_send_tx_flowc_wr(csk); 234 csk->wr_cred -= flowclen16; 235 csk->wr_una_cred += flowclen16; 236 } 237 238 if (csk->wr_cred < credits_needed) { 239 pr_debug("csk 0x%p, skb %u/%u, wr %d < %u.\n", 240 csk, skb->len, skb->data_len, 241 credits_needed, csk->wr_cred); 242 break; 243 } 244 __skb_unlink(skb, &csk->txq); 245 set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx); 246 skb->csum = (__force __wsum)(credits_needed + flowclen16); 247 csk->wr_cred -= credits_needed; 248 csk->wr_una_cred += credits_needed; 249 250 pr_debug("csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n", 251 csk, skb->len, skb->data_len, credits_needed, 252 csk->wr_cred, csk->wr_una_cred); 253 254 if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) { 255 len += cxgbit_skcb_tx_extralen(skb); 256 257 if ((csk->wr_una_cred >= (csk->wr_max_cred / 2)) || 258 (!before(csk->write_seq, 259 csk->snd_una + csk->snd_win))) { 260 compl = 1; 261 csk->wr_una_cred = 0; 262 } 263 264 cxgbit_tx_data_wr(csk, skb, dlen, len, credits_needed, 265 compl); 266 csk->snd_nxt += len; 267 268 } else if ((cxgbit_skcb_flags(skb) & SKCBF_TX_FLAG_COMPL) || 269 (csk->wr_una_cred >= (csk->wr_max_cred / 2))) { 270 struct cpl_close_con_req *req = 271 (struct cpl_close_con_req *)skb->data; 272 req->wr.wr_hi |= htonl(FW_WR_COMPL_F); 273 csk->wr_una_cred = 0; 274 } 275 276 cxgbit_sock_enqueue_wr(csk, skb); 277 t4_set_arp_err_handler(skb, csk, 278 cxgbit_arp_failure_skb_discard); 279 280 pr_debug("csk 0x%p,%u, skb 0x%p, %u.\n", 281 csk, csk->tid, skb, len); 282 283 cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t); 284 } 285 } 286 287 static bool cxgbit_lock_sock(struct cxgbit_sock *csk) 288 { 289 spin_lock_bh(&csk->lock); 290 291 if (before(csk->write_seq, csk->snd_una + csk->snd_win)) 292 csk->lock_owner = true; 293 294 spin_unlock_bh(&csk->lock); 295 296 return csk->lock_owner; 297 } 298 299 static void cxgbit_unlock_sock(struct cxgbit_sock *csk) 300 { 301 struct sk_buff_head backlogq; 302 struct sk_buff *skb; 303 void (*fn)(struct cxgbit_sock *, struct sk_buff *); 304 305 skb_queue_head_init(&backlogq); 306 307 spin_lock_bh(&csk->lock); 308 while (skb_queue_len(&csk->backlogq)) { 309 skb_queue_splice_init(&csk->backlogq, &backlogq); 310 spin_unlock_bh(&csk->lock); 311 312 while ((skb = __skb_dequeue(&backlogq))) { 313 fn = cxgbit_skcb_rx_backlog_fn(skb); 314 fn(csk, skb); 315 } 316 317 spin_lock_bh(&csk->lock); 318 } 319 320 csk->lock_owner = false; 321 spin_unlock_bh(&csk->lock); 322 } 323 324 static int cxgbit_queue_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 325 { 326 int ret = 0; 327 328 wait_event_interruptible(csk->ack_waitq, cxgbit_lock_sock(csk)); 329 330 if (unlikely((csk->com.state != CSK_STATE_ESTABLISHED) || 331 signal_pending(current))) { 332 __kfree_skb(skb); 333 __skb_queue_purge(&csk->ppodq); 334 ret = -1; 335 spin_lock_bh(&csk->lock); 336 if (csk->lock_owner) { 337 spin_unlock_bh(&csk->lock); 338 goto unlock; 339 } 340 spin_unlock_bh(&csk->lock); 341 return ret; 342 } 343 344 csk->write_seq += skb->len + 345 cxgbit_skcb_tx_extralen(skb); 346 347 skb_queue_splice_tail_init(&csk->ppodq, &csk->txq); 348 __skb_queue_tail(&csk->txq, skb); 349 cxgbit_push_tx_frames(csk); 350 351 unlock: 352 cxgbit_unlock_sock(csk); 353 return ret; 354 } 355 356 static int 357 cxgbit_map_skb(struct iscsi_cmd *cmd, struct sk_buff *skb, u32 data_offset, 358 u32 data_length) 359 { 360 u32 i = 0, nr_frags = MAX_SKB_FRAGS; 361 u32 padding = ((-data_length) & 3); 362 struct scatterlist *sg; 363 struct page *page; 364 unsigned int page_off; 365 366 if (padding) 367 nr_frags--; 368 369 /* 370 * We know each entry in t_data_sg contains a page. 371 */ 372 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 373 page_off = (data_offset % PAGE_SIZE); 374 375 while (data_length && (i < nr_frags)) { 376 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 377 378 page = sg_page(sg); 379 380 get_page(page); 381 skb_fill_page_desc(skb, i, page, sg->offset + page_off, 382 cur_len); 383 skb->data_len += cur_len; 384 skb->len += cur_len; 385 skb->truesize += cur_len; 386 387 data_length -= cur_len; 388 page_off = 0; 389 sg = sg_next(sg); 390 i++; 391 } 392 393 if (data_length) 394 return -1; 395 396 if (padding) { 397 page = alloc_page(GFP_KERNEL | __GFP_ZERO); 398 if (!page) 399 return -1; 400 skb_fill_page_desc(skb, i, page, 0, padding); 401 skb->data_len += padding; 402 skb->len += padding; 403 skb->truesize += padding; 404 } 405 406 return 0; 407 } 408 409 static int 410 cxgbit_tx_datain_iso(struct cxgbit_sock *csk, struct iscsi_cmd *cmd, 411 struct iscsi_datain_req *dr) 412 { 413 struct iscsi_conn *conn = csk->conn; 414 struct sk_buff *skb; 415 struct iscsi_datain datain; 416 struct cxgbit_iso_info iso_info; 417 u32 data_length = cmd->se_cmd.data_length; 418 u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength; 419 u32 num_pdu, plen, tx_data = 0; 420 bool task_sense = !!(cmd->se_cmd.se_cmd_flags & 421 SCF_TRANSPORT_TASK_SENSE); 422 bool set_statsn = false; 423 int ret = -1; 424 425 while (data_length) { 426 num_pdu = (data_length + mrdsl - 1) / mrdsl; 427 if (num_pdu > csk->max_iso_npdu) 428 num_pdu = csk->max_iso_npdu; 429 430 plen = num_pdu * mrdsl; 431 if (plen > data_length) 432 plen = data_length; 433 434 skb = __cxgbit_alloc_skb(csk, 0, true); 435 if (unlikely(!skb)) 436 return -ENOMEM; 437 438 memset(skb->data, 0, ISCSI_HDR_LEN); 439 cxgbit_skcb_flags(skb) |= SKCBF_TX_ISO; 440 cxgbit_skcb_submode(skb) |= (csk->submode & 441 CXGBIT_SUBMODE_DCRC); 442 cxgbit_skcb_tx_extralen(skb) = (num_pdu * 443 cxgbit_digest_len[cxgbit_skcb_submode(skb)]) + 444 ((num_pdu - 1) * ISCSI_HDR_LEN); 445 446 memset(&datain, 0, sizeof(struct iscsi_datain)); 447 memset(&iso_info, 0, sizeof(iso_info)); 448 449 if (!tx_data) 450 iso_info.flags |= CXGBIT_ISO_FSLICE; 451 452 if (!(data_length - plen)) { 453 iso_info.flags |= CXGBIT_ISO_LSLICE; 454 if (!task_sense) { 455 datain.flags = ISCSI_FLAG_DATA_STATUS; 456 iscsit_increment_maxcmdsn(cmd, conn->sess); 457 cmd->stat_sn = conn->stat_sn++; 458 set_statsn = true; 459 } 460 } 461 462 iso_info.burst_len = num_pdu * mrdsl; 463 iso_info.mpdu = mrdsl; 464 iso_info.len = ISCSI_HDR_LEN + plen; 465 466 cxgbit_cpl_tx_data_iso(skb, &iso_info); 467 468 datain.offset = tx_data; 469 datain.data_sn = cmd->data_sn - 1; 470 471 iscsit_build_datain_pdu(cmd, conn, &datain, 472 (struct iscsi_data_rsp *)skb->data, 473 set_statsn); 474 475 ret = cxgbit_map_skb(cmd, skb, tx_data, plen); 476 if (unlikely(ret)) { 477 __kfree_skb(skb); 478 goto out; 479 } 480 481 ret = cxgbit_queue_skb(csk, skb); 482 if (unlikely(ret)) 483 goto out; 484 485 tx_data += plen; 486 data_length -= plen; 487 488 cmd->read_data_done += plen; 489 cmd->data_sn += num_pdu; 490 } 491 492 dr->dr_complete = DATAIN_COMPLETE_NORMAL; 493 494 return 0; 495 496 out: 497 return ret; 498 } 499 500 static int 501 cxgbit_tx_datain(struct cxgbit_sock *csk, struct iscsi_cmd *cmd, 502 const struct iscsi_datain *datain) 503 { 504 struct sk_buff *skb; 505 int ret = 0; 506 507 skb = cxgbit_alloc_skb(csk, 0); 508 if (unlikely(!skb)) 509 return -ENOMEM; 510 511 memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN); 512 513 if (datain->length) { 514 cxgbit_skcb_submode(skb) |= (csk->submode & 515 CXGBIT_SUBMODE_DCRC); 516 cxgbit_skcb_tx_extralen(skb) = 517 cxgbit_digest_len[cxgbit_skcb_submode(skb)]; 518 } 519 520 ret = cxgbit_map_skb(cmd, skb, datain->offset, datain->length); 521 if (ret < 0) { 522 __kfree_skb(skb); 523 return ret; 524 } 525 526 return cxgbit_queue_skb(csk, skb); 527 } 528 529 static int 530 cxgbit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 531 struct iscsi_datain_req *dr, 532 const struct iscsi_datain *datain) 533 { 534 struct cxgbit_sock *csk = conn->context; 535 u32 data_length = cmd->se_cmd.data_length; 536 u32 padding = ((-data_length) & 3); 537 u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength; 538 539 if ((data_length > mrdsl) && (!dr->recovery) && 540 (!padding) && (!datain->offset) && csk->max_iso_npdu) { 541 atomic_long_add(data_length - datain->length, 542 &conn->sess->tx_data_octets); 543 return cxgbit_tx_datain_iso(csk, cmd, dr); 544 } 545 546 return cxgbit_tx_datain(csk, cmd, datain); 547 } 548 549 static int 550 cxgbit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 551 const void *data_buf, u32 data_buf_len) 552 { 553 struct cxgbit_sock *csk = conn->context; 554 struct sk_buff *skb; 555 u32 padding = ((-data_buf_len) & 3); 556 557 skb = cxgbit_alloc_skb(csk, data_buf_len + padding); 558 if (unlikely(!skb)) 559 return -ENOMEM; 560 561 memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN); 562 563 if (data_buf_len) { 564 u32 pad_bytes = 0; 565 566 skb_store_bits(skb, ISCSI_HDR_LEN, data_buf, data_buf_len); 567 568 if (padding) 569 skb_store_bits(skb, ISCSI_HDR_LEN + data_buf_len, 570 &pad_bytes, padding); 571 } 572 573 cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[ 574 cxgbit_skcb_submode(skb)]; 575 576 return cxgbit_queue_skb(csk, skb); 577 } 578 579 int 580 cxgbit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 581 struct iscsi_datain_req *dr, const void *buf, u32 buf_len) 582 { 583 if (dr) 584 return cxgbit_xmit_datain_pdu(conn, cmd, dr, buf); 585 else 586 return cxgbit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 587 } 588 589 int cxgbit_validate_params(struct iscsi_conn *conn) 590 { 591 struct cxgbit_sock *csk = conn->context; 592 struct cxgbit_device *cdev = csk->com.cdev; 593 struct iscsi_param *param; 594 u32 max_xmitdsl; 595 596 param = iscsi_find_param_from_key(MAXXMITDATASEGMENTLENGTH, 597 conn->param_list); 598 if (!param) 599 return -1; 600 601 if (kstrtou32(param->value, 0, &max_xmitdsl) < 0) 602 return -1; 603 604 if (max_xmitdsl > cdev->mdsl) { 605 if (iscsi_change_param_sprintf( 606 conn, "MaxXmitDataSegmentLength=%u", cdev->mdsl)) 607 return -1; 608 } 609 610 return 0; 611 } 612 613 static int cxgbit_set_digest(struct cxgbit_sock *csk) 614 { 615 struct iscsi_conn *conn = csk->conn; 616 struct iscsi_param *param; 617 618 param = iscsi_find_param_from_key(HEADERDIGEST, conn->param_list); 619 if (!param) { 620 pr_err("param not found key %s\n", HEADERDIGEST); 621 return -1; 622 } 623 624 if (!strcmp(param->value, CRC32C)) 625 csk->submode |= CXGBIT_SUBMODE_HCRC; 626 627 param = iscsi_find_param_from_key(DATADIGEST, conn->param_list); 628 if (!param) { 629 csk->submode = 0; 630 pr_err("param not found key %s\n", DATADIGEST); 631 return -1; 632 } 633 634 if (!strcmp(param->value, CRC32C)) 635 csk->submode |= CXGBIT_SUBMODE_DCRC; 636 637 if (cxgbit_setup_conn_digest(csk)) { 638 csk->submode = 0; 639 return -1; 640 } 641 642 return 0; 643 } 644 645 static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk) 646 { 647 struct iscsi_conn *conn = csk->conn; 648 struct iscsi_conn_ops *conn_ops = conn->conn_ops; 649 struct iscsi_param *param; 650 u32 mrdsl, mbl; 651 u32 max_npdu, max_iso_npdu; 652 u32 max_iso_payload; 653 654 if (conn->login->leading_connection) { 655 param = iscsi_find_param_from_key(MAXBURSTLENGTH, 656 conn->param_list); 657 if (!param) { 658 pr_err("param not found key %s\n", MAXBURSTLENGTH); 659 return -1; 660 } 661 662 if (kstrtou32(param->value, 0, &mbl) < 0) 663 return -1; 664 } else { 665 mbl = conn->sess->sess_ops->MaxBurstLength; 666 } 667 668 mrdsl = conn_ops->MaxRecvDataSegmentLength; 669 max_npdu = mbl / mrdsl; 670 671 max_iso_payload = rounddown(CXGBIT_MAX_ISO_PAYLOAD, csk->emss); 672 673 max_iso_npdu = max_iso_payload / 674 (ISCSI_HDR_LEN + mrdsl + 675 cxgbit_digest_len[csk->submode]); 676 677 csk->max_iso_npdu = min(max_npdu, max_iso_npdu); 678 679 if (csk->max_iso_npdu <= 1) 680 csk->max_iso_npdu = 0; 681 682 return 0; 683 } 684 685 /* 686 * cxgbit_seq_pdu_inorder() 687 * @csk: pointer to cxgbit socket structure 688 * 689 * This function checks whether data sequence and data 690 * pdu are in order. 691 * 692 * Return: returns -1 on error, 0 if data sequence and 693 * data pdu are in order, 1 if data sequence or data pdu 694 * is not in order. 695 */ 696 static int cxgbit_seq_pdu_inorder(struct cxgbit_sock *csk) 697 { 698 struct iscsi_conn *conn = csk->conn; 699 struct iscsi_param *param; 700 701 if (conn->login->leading_connection) { 702 param = iscsi_find_param_from_key(DATASEQUENCEINORDER, 703 conn->param_list); 704 if (!param) { 705 pr_err("param not found key %s\n", DATASEQUENCEINORDER); 706 return -1; 707 } 708 709 if (strcmp(param->value, YES)) 710 return 1; 711 712 param = iscsi_find_param_from_key(DATAPDUINORDER, 713 conn->param_list); 714 if (!param) { 715 pr_err("param not found key %s\n", DATAPDUINORDER); 716 return -1; 717 } 718 719 if (strcmp(param->value, YES)) 720 return 1; 721 722 } else { 723 if (!conn->sess->sess_ops->DataSequenceInOrder) 724 return 1; 725 if (!conn->sess->sess_ops->DataPDUInOrder) 726 return 1; 727 } 728 729 return 0; 730 } 731 732 static int cxgbit_set_params(struct iscsi_conn *conn) 733 { 734 struct cxgbit_sock *csk = conn->context; 735 struct cxgbit_device *cdev = csk->com.cdev; 736 struct cxgbi_ppm *ppm = *csk->com.cdev->lldi.iscsi_ppm; 737 struct iscsi_conn_ops *conn_ops = conn->conn_ops; 738 struct iscsi_param *param; 739 u8 erl; 740 741 if (conn_ops->MaxRecvDataSegmentLength > cdev->mdsl) 742 conn_ops->MaxRecvDataSegmentLength = cdev->mdsl; 743 744 if (cxgbit_set_digest(csk)) 745 return -1; 746 747 if (conn->login->leading_connection) { 748 param = iscsi_find_param_from_key(ERRORRECOVERYLEVEL, 749 conn->param_list); 750 if (!param) { 751 pr_err("param not found key %s\n", ERRORRECOVERYLEVEL); 752 return -1; 753 } 754 if (kstrtou8(param->value, 0, &erl) < 0) 755 return -1; 756 } else { 757 erl = conn->sess->sess_ops->ErrorRecoveryLevel; 758 } 759 760 if (!erl) { 761 int ret; 762 763 ret = cxgbit_seq_pdu_inorder(csk); 764 if (ret < 0) { 765 return -1; 766 } else if (ret > 0) { 767 if (is_t5(cdev->lldi.adapter_type)) 768 goto enable_ddp; 769 else 770 return 0; 771 } 772 773 if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) { 774 if (cxgbit_set_iso_npdu(csk)) 775 return -1; 776 } 777 778 enable_ddp: 779 if (test_bit(CDEV_DDP_ENABLE, &cdev->flags)) { 780 if (cxgbit_setup_conn_pgidx(csk, 781 ppm->tformat.pgsz_idx_dflt)) 782 return -1; 783 set_bit(CSK_DDP_ENABLE, &csk->com.flags); 784 } 785 } 786 787 return 0; 788 } 789 790 int 791 cxgbit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 792 u32 length) 793 { 794 struct cxgbit_sock *csk = conn->context; 795 struct sk_buff *skb; 796 u32 padding_buf = 0; 797 u8 padding = ((-length) & 3); 798 799 skb = cxgbit_alloc_skb(csk, length + padding); 800 if (!skb) 801 return -ENOMEM; 802 skb_store_bits(skb, 0, login->rsp, ISCSI_HDR_LEN); 803 skb_store_bits(skb, ISCSI_HDR_LEN, login->rsp_buf, length); 804 805 if (padding) 806 skb_store_bits(skb, ISCSI_HDR_LEN + length, 807 &padding_buf, padding); 808 809 if (login->login_complete) { 810 if (cxgbit_set_params(conn)) { 811 kfree_skb(skb); 812 return -1; 813 } 814 815 set_bit(CSK_LOGIN_DONE, &csk->com.flags); 816 } 817 818 if (cxgbit_queue_skb(csk, skb)) 819 return -1; 820 821 if ((!login->login_complete) && (!login->login_failed)) 822 schedule_delayed_work(&conn->login_work, 0); 823 824 return 0; 825 } 826 827 static void 828 cxgbit_skb_copy_to_sg(struct sk_buff *skb, struct scatterlist *sg, 829 unsigned int nents, u32 skip) 830 { 831 struct skb_seq_state st; 832 const u8 *buf; 833 unsigned int consumed = 0, buf_len; 834 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(skb); 835 836 skb_prepare_seq_read(skb, pdu_cb->doffset, 837 pdu_cb->doffset + pdu_cb->dlen, 838 &st); 839 840 while (true) { 841 buf_len = skb_seq_read(consumed, &buf, &st); 842 if (!buf_len) { 843 skb_abort_seq_read(&st); 844 break; 845 } 846 847 consumed += sg_pcopy_from_buffer(sg, nents, (void *)buf, 848 buf_len, skip + consumed); 849 } 850 } 851 852 static struct iscsi_cmd *cxgbit_allocate_cmd(struct cxgbit_sock *csk) 853 { 854 struct iscsi_conn *conn = csk->conn; 855 struct cxgbi_ppm *ppm = cdev2ppm(csk->com.cdev); 856 struct cxgbit_cmd *ccmd; 857 struct iscsi_cmd *cmd; 858 859 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 860 if (!cmd) { 861 pr_err("Unable to allocate iscsi_cmd + cxgbit_cmd\n"); 862 return NULL; 863 } 864 865 ccmd = iscsit_priv_cmd(cmd); 866 ccmd->ttinfo.tag = ppm->tformat.no_ddp_mask; 867 ccmd->setup_ddp = true; 868 869 return cmd; 870 } 871 872 static int 873 cxgbit_handle_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 874 u32 length) 875 { 876 struct iscsi_conn *conn = cmd->conn; 877 struct cxgbit_sock *csk = conn->context; 878 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 879 880 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) { 881 pr_err("ImmediateData CRC32C DataDigest error\n"); 882 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 883 pr_err("Unable to recover from" 884 " Immediate Data digest failure while" 885 " in ERL=0.\n"); 886 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, 887 (unsigned char *)hdr); 888 return IMMEDIATE_DATA_CANNOT_RECOVER; 889 } 890 891 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, 892 (unsigned char *)hdr); 893 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 894 } 895 896 if (cmd->se_cmd.se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { 897 struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd); 898 struct skb_shared_info *ssi = skb_shinfo(csk->skb); 899 skb_frag_t *dfrag = &ssi->frags[pdu_cb->dfrag_idx]; 900 901 sg_init_table(&ccmd->sg, 1); 902 sg_set_page(&ccmd->sg, skb_frag_page(dfrag), 903 skb_frag_size(dfrag), skb_frag_off(dfrag)); 904 get_page(skb_frag_page(dfrag)); 905 906 cmd->se_cmd.t_data_sg = &ccmd->sg; 907 cmd->se_cmd.t_data_nents = 1; 908 909 ccmd->release = true; 910 } else { 911 struct scatterlist *sg = &cmd->se_cmd.t_data_sg[0]; 912 u32 sg_nents = max(1UL, DIV_ROUND_UP(pdu_cb->dlen, PAGE_SIZE)); 913 914 cxgbit_skb_copy_to_sg(csk->skb, sg, sg_nents, 0); 915 } 916 917 cmd->write_data_done += pdu_cb->dlen; 918 919 if (cmd->write_data_done == cmd->se_cmd.data_length) { 920 spin_lock_bh(&cmd->istate_lock); 921 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 922 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 923 spin_unlock_bh(&cmd->istate_lock); 924 } 925 926 return IMMEDIATE_DATA_NORMAL_OPERATION; 927 } 928 929 static int 930 cxgbit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 931 bool dump_payload) 932 { 933 struct iscsi_conn *conn = cmd->conn; 934 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 935 /* 936 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 937 */ 938 if (dump_payload) 939 goto after_immediate_data; 940 941 immed_ret = cxgbit_handle_immediate_data(cmd, hdr, 942 cmd->first_burst_len); 943 after_immediate_data: 944 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 945 /* 946 * A PDU/CmdSN carrying Immediate Data passed 947 * DataCRC, check against ExpCmdSN/MaxCmdSN if 948 * Immediate Bit is not set. 949 */ 950 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 951 (unsigned char *)hdr, 952 hdr->cmdsn); 953 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 954 return -1; 955 956 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 957 target_put_sess_cmd(&cmd->se_cmd); 958 return 0; 959 } else if (cmd->unsolicited_data) { 960 iscsit_set_unsolicited_dataout(cmd); 961 } 962 963 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 964 /* 965 * Immediate Data failed DataCRC and ERL>=1, 966 * silently drop this PDU and let the initiator 967 * plug the CmdSN gap. 968 * 969 * FIXME: Send Unsolicited NOPIN with reserved 970 * TTT here to help the initiator figure out 971 * the missing CmdSN, although they should be 972 * intelligent enough to determine the missing 973 * CmdSN and issue a retry to plug the sequence. 974 */ 975 cmd->i_state = ISTATE_REMOVE; 976 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 977 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 978 return -1; 979 980 return 0; 981 } 982 983 static int 984 cxgbit_handle_scsi_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd) 985 { 986 struct iscsi_conn *conn = csk->conn; 987 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 988 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)pdu_cb->hdr; 989 int rc; 990 bool dump_payload = false; 991 992 rc = iscsit_setup_scsi_cmd(conn, cmd, (unsigned char *)hdr); 993 if (rc < 0) 994 return rc; 995 996 if (pdu_cb->dlen && (pdu_cb->dlen == cmd->se_cmd.data_length) && 997 (pdu_cb->nr_dfrags == 1)) 998 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 999 1000 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1001 if (rc < 0) 1002 return 0; 1003 else if (rc > 0) 1004 dump_payload = true; 1005 1006 if (!pdu_cb->dlen) 1007 return 0; 1008 1009 return cxgbit_get_immediate_data(cmd, hdr, dump_payload); 1010 } 1011 1012 static int cxgbit_handle_iscsi_dataout(struct cxgbit_sock *csk) 1013 { 1014 struct scatterlist *sg_start; 1015 struct iscsi_conn *conn = csk->conn; 1016 struct iscsi_cmd *cmd = NULL; 1017 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb); 1018 struct iscsi_data *hdr = (struct iscsi_data *)pdu_cb->hdr; 1019 u32 data_offset = be32_to_cpu(hdr->offset); 1020 u32 data_len = pdu_cb->dlen; 1021 int rc, sg_nents, sg_off; 1022 bool dcrc_err = false; 1023 1024 if (pdu_cb->flags & PDUCBF_RX_DDP_CMP) { 1025 u32 offset = be32_to_cpu(hdr->offset); 1026 u32 ddp_data_len; 1027 u32 payload_length = ntoh24(hdr->dlength); 1028 bool success = false; 1029 1030 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 0); 1031 if (!cmd) 1032 return 0; 1033 1034 ddp_data_len = offset - cmd->write_data_done; 1035 atomic_long_add(ddp_data_len, &conn->sess->rx_data_octets); 1036 1037 cmd->write_data_done = offset; 1038 cmd->next_burst_len = ddp_data_len; 1039 cmd->data_sn = be32_to_cpu(hdr->datasn); 1040 1041 rc = __iscsit_check_dataout_hdr(conn, (unsigned char *)hdr, 1042 cmd, payload_length, &success); 1043 if (rc < 0) 1044 return rc; 1045 else if (!success) 1046 return 0; 1047 } else { 1048 rc = iscsit_check_dataout_hdr(conn, (unsigned char *)hdr, &cmd); 1049 if (rc < 0) 1050 return rc; 1051 else if (!cmd) 1052 return 0; 1053 } 1054 1055 if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) { 1056 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1057 " DataSN: 0x%08x\n", 1058 hdr->itt, hdr->offset, data_len, 1059 hdr->datasn); 1060 1061 dcrc_err = true; 1062 goto check_payload; 1063 } 1064 1065 pr_debug("DataOut data_len: %u, " 1066 "write_data_done: %u, data_length: %u\n", 1067 data_len, cmd->write_data_done, 1068 cmd->se_cmd.data_length); 1069 1070 if (!(pdu_cb->flags & PDUCBF_RX_DATA_DDPD)) { 1071 u32 skip = data_offset % PAGE_SIZE; 1072 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(skip + data_len, PAGE_SIZE)); 1076 1077 cxgbit_skb_copy_to_sg(csk->skb, sg_start, sg_nents, skip); 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, skb_frag_off(&ssi->frags[i]), 1407 skb_frag_size(&ssi->frags[i])); 1408 } 1409 1410 static void cxgbit_lro_hskb_reset(struct cxgbit_sock *csk) 1411 { 1412 struct sk_buff *skb = csk->lro_hskb; 1413 struct skb_shared_info *ssi = skb_shinfo(skb); 1414 u8 i; 1415 1416 memset(skb->data, 0, LRO_SKB_MIN_HEADROOM); 1417 for (i = 0; i < ssi->nr_frags; i++) 1418 put_page(skb_frag_page(&ssi->frags[i])); 1419 ssi->nr_frags = 0; 1420 skb->data_len = 0; 1421 skb->truesize -= skb->len; 1422 skb->len = 0; 1423 } 1424 1425 static void 1426 cxgbit_lro_skb_merge(struct cxgbit_sock *csk, struct sk_buff *skb, u8 pdu_idx) 1427 { 1428 struct sk_buff *hskb = csk->lro_hskb; 1429 struct cxgbit_lro_pdu_cb *hpdu_cb = cxgbit_skb_lro_pdu_cb(hskb, 0); 1430 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, pdu_idx); 1431 struct skb_shared_info *hssi = skb_shinfo(hskb); 1432 struct skb_shared_info *ssi = skb_shinfo(skb); 1433 unsigned int len = 0; 1434 1435 if (pdu_cb->flags & PDUCBF_RX_HDR) { 1436 u8 hfrag_idx = hssi->nr_frags; 1437 1438 hpdu_cb->flags |= pdu_cb->flags; 1439 hpdu_cb->seq = pdu_cb->seq; 1440 hpdu_cb->hdr = pdu_cb->hdr; 1441 hpdu_cb->hlen = pdu_cb->hlen; 1442 1443 memcpy(&hssi->frags[hfrag_idx], &ssi->frags[pdu_cb->hfrag_idx], 1444 sizeof(skb_frag_t)); 1445 1446 get_page(skb_frag_page(&hssi->frags[hfrag_idx])); 1447 hssi->nr_frags++; 1448 hpdu_cb->frags++; 1449 hpdu_cb->hfrag_idx = hfrag_idx; 1450 1451 len = skb_frag_size(&hssi->frags[hfrag_idx]); 1452 hskb->len += len; 1453 hskb->data_len += len; 1454 hskb->truesize += len; 1455 } 1456 1457 if (pdu_cb->flags & PDUCBF_RX_DATA) { 1458 u8 dfrag_idx = hssi->nr_frags, i; 1459 1460 hpdu_cb->flags |= pdu_cb->flags; 1461 hpdu_cb->dfrag_idx = dfrag_idx; 1462 1463 len = 0; 1464 for (i = 0; i < pdu_cb->nr_dfrags; dfrag_idx++, i++) { 1465 memcpy(&hssi->frags[dfrag_idx], 1466 &ssi->frags[pdu_cb->dfrag_idx + i], 1467 sizeof(skb_frag_t)); 1468 1469 get_page(skb_frag_page(&hssi->frags[dfrag_idx])); 1470 1471 len += skb_frag_size(&hssi->frags[dfrag_idx]); 1472 1473 hssi->nr_frags++; 1474 hpdu_cb->frags++; 1475 } 1476 1477 hpdu_cb->dlen = pdu_cb->dlen; 1478 hpdu_cb->doffset = hpdu_cb->hlen; 1479 hpdu_cb->nr_dfrags = pdu_cb->nr_dfrags; 1480 hskb->len += len; 1481 hskb->data_len += len; 1482 hskb->truesize += len; 1483 } 1484 1485 if (pdu_cb->flags & PDUCBF_RX_STATUS) { 1486 hpdu_cb->flags |= pdu_cb->flags; 1487 1488 if (hpdu_cb->flags & PDUCBF_RX_DATA) 1489 hpdu_cb->flags &= ~PDUCBF_RX_DATA_DDPD; 1490 1491 hpdu_cb->ddigest = pdu_cb->ddigest; 1492 hpdu_cb->pdulen = pdu_cb->pdulen; 1493 } 1494 } 1495 1496 static int cxgbit_process_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 1497 { 1498 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); 1499 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0); 1500 u8 pdu_idx = 0, last_idx = 0; 1501 int ret = 0; 1502 1503 if (!pdu_cb->complete) { 1504 cxgbit_lro_skb_merge(csk, skb, 0); 1505 1506 if (pdu_cb->flags & PDUCBF_RX_STATUS) { 1507 struct sk_buff *hskb = csk->lro_hskb; 1508 1509 ret = cxgbit_process_iscsi_pdu(csk, hskb, 0); 1510 1511 cxgbit_lro_hskb_reset(csk); 1512 1513 if (ret < 0) 1514 goto out; 1515 } 1516 1517 pdu_idx = 1; 1518 } 1519 1520 if (lro_cb->pdu_idx) 1521 last_idx = lro_cb->pdu_idx - 1; 1522 1523 for (; pdu_idx <= last_idx; pdu_idx++) { 1524 ret = cxgbit_process_iscsi_pdu(csk, skb, pdu_idx); 1525 if (ret < 0) 1526 goto out; 1527 } 1528 1529 if ((!lro_cb->complete) && lro_cb->pdu_idx) 1530 cxgbit_lro_skb_merge(csk, skb, lro_cb->pdu_idx); 1531 1532 out: 1533 return ret; 1534 } 1535 1536 static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 1537 { 1538 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb); 1539 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0); 1540 int ret = -1; 1541 1542 if ((pdu_cb->flags & PDUCBF_RX_HDR) && 1543 (pdu_cb->seq != csk->rcv_nxt)) { 1544 pr_info("csk 0x%p, tid 0x%x, seq 0x%x != 0x%x.\n", 1545 csk, csk->tid, pdu_cb->seq, csk->rcv_nxt); 1546 cxgbit_lro_skb_dump(skb); 1547 return ret; 1548 } 1549 1550 csk->rcv_nxt += lro_cb->pdu_totallen; 1551 1552 ret = cxgbit_process_lro_skb(csk, skb); 1553 1554 csk->rx_credits += lro_cb->pdu_totallen; 1555 1556 if (csk->rx_credits >= (csk->rcv_win / 4)) 1557 cxgbit_rx_data_ack(csk); 1558 1559 return ret; 1560 } 1561 1562 static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb) 1563 { 1564 struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi; 1565 int ret = -1; 1566 1567 if (likely(cxgbit_skcb_flags(skb) & SKCBF_RX_LRO)) { 1568 if (is_t5(lldi->adapter_type)) 1569 ret = cxgbit_rx_lro_skb(csk, skb); 1570 else 1571 ret = cxgbit_process_lro_skb(csk, skb); 1572 } 1573 1574 __kfree_skb(skb); 1575 return ret; 1576 } 1577 1578 static bool cxgbit_rxq_len(struct cxgbit_sock *csk, struct sk_buff_head *rxq) 1579 { 1580 spin_lock_bh(&csk->rxq.lock); 1581 if (skb_queue_len(&csk->rxq)) { 1582 skb_queue_splice_init(&csk->rxq, rxq); 1583 spin_unlock_bh(&csk->rxq.lock); 1584 return true; 1585 } 1586 spin_unlock_bh(&csk->rxq.lock); 1587 return false; 1588 } 1589 1590 static int cxgbit_wait_rxq(struct cxgbit_sock *csk) 1591 { 1592 struct sk_buff *skb; 1593 struct sk_buff_head rxq; 1594 1595 skb_queue_head_init(&rxq); 1596 1597 wait_event_interruptible(csk->waitq, cxgbit_rxq_len(csk, &rxq)); 1598 1599 if (signal_pending(current)) 1600 goto out; 1601 1602 while ((skb = __skb_dequeue(&rxq))) { 1603 if (cxgbit_rx_skb(csk, skb)) 1604 goto out; 1605 } 1606 1607 return 0; 1608 out: 1609 __skb_queue_purge(&rxq); 1610 return -1; 1611 } 1612 1613 int cxgbit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 1614 { 1615 struct cxgbit_sock *csk = conn->context; 1616 int ret = -1; 1617 1618 while (!test_and_clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags)) { 1619 ret = cxgbit_wait_rxq(csk); 1620 if (ret) { 1621 clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags); 1622 break; 1623 } 1624 } 1625 1626 return ret; 1627 } 1628 1629 void cxgbit_get_rx_pdu(struct iscsi_conn *conn) 1630 { 1631 struct cxgbit_sock *csk = conn->context; 1632 1633 while (!kthread_should_stop()) { 1634 iscsit_thread_check_cpumask(conn, current, 0); 1635 if (cxgbit_wait_rxq(csk)) 1636 return; 1637 } 1638 } 1639