Or Gerlitz | e85b24b | 2006-05-11 10:02:19 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
| 3 | * |
| 4 | * This software is available to you under a choice of one of two |
| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
| 6 | * General Public License (GPL) Version 2, available from the file |
| 7 | * COPYING in the main directory of this source tree, or the |
| 8 | * OpenIB.org BSD license below: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
| 31 | * |
| 32 | * $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $ |
| 33 | */ |
| 34 | #include <linux/kernel.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/mm.h> |
| 37 | #include <asm/io.h> |
| 38 | #include <asm/scatterlist.h> |
| 39 | #include <linux/scatterlist.h> |
| 40 | #include <linux/kfifo.h> |
| 41 | #include <scsi/scsi_cmnd.h> |
| 42 | #include <scsi/scsi_host.h> |
| 43 | |
| 44 | #include "iscsi_iser.h" |
| 45 | |
| 46 | /* Constant PDU lengths calculations */ |
| 47 | #define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \ |
| 48 | sizeof (struct iscsi_hdr)) |
| 49 | |
| 50 | /* iser_dto_add_regd_buff - increments the reference count for * |
| 51 | * the registered buffer & adds it to the DTO object */ |
| 52 | static void iser_dto_add_regd_buff(struct iser_dto *dto, |
| 53 | struct iser_regd_buf *regd_buf, |
| 54 | unsigned long use_offset, |
| 55 | unsigned long use_size) |
| 56 | { |
| 57 | int add_idx; |
| 58 | |
| 59 | atomic_inc(®d_buf->ref_count); |
| 60 | |
| 61 | add_idx = dto->regd_vector_len; |
| 62 | dto->regd[add_idx] = regd_buf; |
| 63 | dto->used_sz[add_idx] = use_size; |
| 64 | dto->offset[add_idx] = use_offset; |
| 65 | |
| 66 | dto->regd_vector_len++; |
| 67 | } |
| 68 | |
| 69 | static int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask, |
| 70 | struct iser_data_buf *data, |
| 71 | enum iser_data_dir iser_dir, |
| 72 | enum dma_data_direction dma_dir) |
| 73 | { |
| 74 | struct device *dma_device; |
| 75 | |
| 76 | iser_ctask->dir[iser_dir] = 1; |
| 77 | dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device; |
| 78 | |
| 79 | data->dma_nents = dma_map_sg(dma_device, data->buf, data->size, dma_dir); |
| 80 | if (data->dma_nents == 0) { |
| 81 | iser_err("dma_map_sg failed!!!\n"); |
| 82 | return -EINVAL; |
| 83 | } |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask) |
| 88 | { |
| 89 | struct device *dma_device; |
| 90 | struct iser_data_buf *data; |
| 91 | |
| 92 | dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device; |
| 93 | |
| 94 | if (iser_ctask->dir[ISER_DIR_IN]) { |
| 95 | data = &iser_ctask->data[ISER_DIR_IN]; |
| 96 | dma_unmap_sg(dma_device, data->buf, data->size, DMA_FROM_DEVICE); |
| 97 | } |
| 98 | |
| 99 | if (iser_ctask->dir[ISER_DIR_OUT]) { |
| 100 | data = &iser_ctask->data[ISER_DIR_OUT]; |
| 101 | dma_unmap_sg(dma_device, data->buf, data->size, DMA_TO_DEVICE); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /* Register user buffer memory and initialize passive rdma |
| 106 | * dto descriptor. Total data size is stored in |
| 107 | * iser_ctask->data[ISER_DIR_IN].data_len |
| 108 | */ |
| 109 | static int iser_prepare_read_cmd(struct iscsi_cmd_task *ctask, |
| 110 | unsigned int edtl) |
| 111 | |
| 112 | { |
| 113 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 114 | struct iser_regd_buf *regd_buf; |
| 115 | int err; |
| 116 | struct iser_hdr *hdr = &iser_ctask->desc.iser_header; |
| 117 | struct iser_data_buf *buf_in = &iser_ctask->data[ISER_DIR_IN]; |
| 118 | |
| 119 | err = iser_dma_map_task_data(iser_ctask, |
| 120 | buf_in, |
| 121 | ISER_DIR_IN, |
| 122 | DMA_FROM_DEVICE); |
| 123 | if (err) |
| 124 | return err; |
| 125 | |
| 126 | if (edtl > iser_ctask->data[ISER_DIR_IN].data_len) { |
| 127 | iser_err("Total data length: %ld, less than EDTL: " |
| 128 | "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", |
| 129 | iser_ctask->data[ISER_DIR_IN].data_len, edtl, |
| 130 | ctask->itt, iser_ctask->iser_conn); |
| 131 | return -EINVAL; |
| 132 | } |
| 133 | |
| 134 | err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_IN); |
| 135 | if (err) { |
| 136 | iser_err("Failed to set up Data-IN RDMA\n"); |
| 137 | return err; |
| 138 | } |
| 139 | regd_buf = &iser_ctask->rdma_regd[ISER_DIR_IN]; |
| 140 | |
| 141 | hdr->flags |= ISER_RSV; |
| 142 | hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey); |
| 143 | hdr->read_va = cpu_to_be64(regd_buf->reg.va); |
| 144 | |
| 145 | iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", |
| 146 | ctask->itt, regd_buf->reg.rkey, |
| 147 | (unsigned long long)regd_buf->reg.va); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | /* Register user buffer memory and initialize passive rdma |
| 153 | * dto descriptor. Total data size is stored in |
| 154 | * ctask->data[ISER_DIR_OUT].data_len |
| 155 | */ |
| 156 | static int |
| 157 | iser_prepare_write_cmd(struct iscsi_cmd_task *ctask, |
| 158 | unsigned int imm_sz, |
| 159 | unsigned int unsol_sz, |
| 160 | unsigned int edtl) |
| 161 | { |
| 162 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 163 | struct iser_regd_buf *regd_buf; |
| 164 | int err; |
| 165 | struct iser_dto *send_dto = &iser_ctask->desc.dto; |
| 166 | struct iser_hdr *hdr = &iser_ctask->desc.iser_header; |
| 167 | struct iser_data_buf *buf_out = &iser_ctask->data[ISER_DIR_OUT]; |
| 168 | |
| 169 | err = iser_dma_map_task_data(iser_ctask, |
| 170 | buf_out, |
| 171 | ISER_DIR_OUT, |
| 172 | DMA_TO_DEVICE); |
| 173 | if (err) |
| 174 | return err; |
| 175 | |
| 176 | if (edtl > iser_ctask->data[ISER_DIR_OUT].data_len) { |
| 177 | iser_err("Total data length: %ld, less than EDTL: %d, " |
| 178 | "in WRITE cmd BHS itt: %d, conn: 0x%p\n", |
| 179 | iser_ctask->data[ISER_DIR_OUT].data_len, |
| 180 | edtl, ctask->itt, ctask->conn); |
| 181 | return -EINVAL; |
| 182 | } |
| 183 | |
| 184 | err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_OUT); |
| 185 | if (err != 0) { |
| 186 | iser_err("Failed to register write cmd RDMA mem\n"); |
| 187 | return err; |
| 188 | } |
| 189 | |
| 190 | regd_buf = &iser_ctask->rdma_regd[ISER_DIR_OUT]; |
| 191 | |
| 192 | if (unsol_sz < edtl) { |
| 193 | hdr->flags |= ISER_WSV; |
| 194 | hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey); |
| 195 | hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz); |
| 196 | |
| 197 | iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X " |
| 198 | "VA:%#llX + unsol:%d\n", |
| 199 | ctask->itt, regd_buf->reg.rkey, |
| 200 | (unsigned long long)regd_buf->reg.va, unsol_sz); |
| 201 | } |
| 202 | |
| 203 | if (imm_sz > 0) { |
| 204 | iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", |
| 205 | ctask->itt, imm_sz); |
| 206 | iser_dto_add_regd_buff(send_dto, |
| 207 | regd_buf, |
| 208 | 0, |
| 209 | imm_sz); |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * iser_post_receive_control - allocates, initializes and posts receive DTO. |
| 217 | */ |
| 218 | static int iser_post_receive_control(struct iscsi_conn *conn) |
| 219 | { |
| 220 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 221 | struct iser_desc *rx_desc; |
| 222 | struct iser_regd_buf *regd_hdr; |
| 223 | struct iser_regd_buf *regd_data; |
| 224 | struct iser_dto *recv_dto = NULL; |
| 225 | struct iser_device *device = iser_conn->ib_conn->device; |
| 226 | int rx_data_size, err = 0; |
| 227 | |
| 228 | rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); |
| 229 | if (rx_desc == NULL) { |
| 230 | iser_err("Failed to alloc desc for post recv\n"); |
| 231 | return -ENOMEM; |
| 232 | } |
| 233 | rx_desc->type = ISCSI_RX; |
| 234 | |
| 235 | /* for the login sequence we must support rx of upto 8K; login is done |
| 236 | * after conn create/bind (connect) and conn stop/bind (reconnect), |
| 237 | * what's common for both schemes is that the connection is not started |
| 238 | */ |
| 239 | if (conn->c_stage != ISCSI_CONN_STARTED) |
| 240 | rx_data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; |
| 241 | else /* FIXME till user space sets conn->max_recv_dlength correctly */ |
| 242 | rx_data_size = 128; |
| 243 | |
| 244 | rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); |
| 245 | if (rx_desc->data == NULL) { |
| 246 | iser_err("Failed to alloc data buf for post recv\n"); |
| 247 | err = -ENOMEM; |
| 248 | goto post_rx_kmalloc_failure; |
| 249 | } |
| 250 | |
| 251 | recv_dto = &rx_desc->dto; |
| 252 | recv_dto->conn = iser_conn; |
| 253 | recv_dto->regd_vector_len = 0; |
| 254 | |
| 255 | regd_hdr = &rx_desc->hdr_regd_buf; |
| 256 | memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); |
| 257 | regd_hdr->device = device; |
| 258 | regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ |
| 259 | regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; |
| 260 | |
| 261 | iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); |
| 262 | |
| 263 | iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); |
| 264 | |
| 265 | regd_data = &rx_desc->data_regd_buf; |
| 266 | memset(regd_data, 0, sizeof(struct iser_regd_buf)); |
| 267 | regd_data->device = device; |
| 268 | regd_data->virt_addr = rx_desc->data; |
| 269 | regd_data->data_size = rx_data_size; |
| 270 | |
| 271 | iser_reg_single(device, regd_data, DMA_FROM_DEVICE); |
| 272 | |
| 273 | iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); |
| 274 | |
| 275 | err = iser_post_recv(rx_desc); |
| 276 | if (!err) |
| 277 | return 0; |
| 278 | |
| 279 | /* iser_post_recv failed */ |
| 280 | iser_dto_buffs_release(recv_dto); |
| 281 | kfree(rx_desc->data); |
| 282 | post_rx_kmalloc_failure: |
| 283 | kmem_cache_free(ig.desc_cache, rx_desc); |
| 284 | return err; |
| 285 | } |
| 286 | |
| 287 | /* creates a new tx descriptor and adds header regd buffer */ |
| 288 | static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, |
| 289 | struct iser_desc *tx_desc) |
| 290 | { |
| 291 | struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf; |
| 292 | struct iser_dto *send_dto = &tx_desc->dto; |
| 293 | |
| 294 | memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); |
| 295 | regd_hdr->device = iser_conn->ib_conn->device; |
| 296 | regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ |
| 297 | regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; |
| 298 | |
| 299 | send_dto->conn = iser_conn; |
| 300 | send_dto->notify_enable = 1; |
| 301 | send_dto->regd_vector_len = 0; |
| 302 | |
| 303 | memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); |
| 304 | tx_desc->iser_header.flags = ISER_VER; |
| 305 | |
| 306 | iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * iser_conn_set_full_featured_mode - (iSER API) |
| 311 | */ |
| 312 | int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) |
| 313 | { |
| 314 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 315 | |
| 316 | int i; |
| 317 | /* no need to keep it in a var, we are after login so if this should |
| 318 | * be negotiated, by now the result should be available here */ |
| 319 | int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; |
| 320 | |
| 321 | iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); |
| 322 | |
| 323 | /* Check that there is no posted recv or send buffers left - */ |
| 324 | /* they must be consumed during the login phase */ |
| 325 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); |
| 326 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); |
| 327 | |
| 328 | /* Initial post receive buffers */ |
| 329 | for (i = 0; i < initial_post_recv_bufs_num; i++) { |
| 330 | if (iser_post_receive_control(conn) != 0) { |
| 331 | iser_err("Failed to post recv bufs at:%d conn:0x%p\n", |
| 332 | i, conn); |
| 333 | return -ENOMEM; |
| 334 | } |
| 335 | } |
| 336 | iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn); |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | static int |
| 341 | iser_check_xmit(struct iscsi_conn *conn, void *task) |
| 342 | { |
| 343 | int rc = 0; |
| 344 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 345 | |
| 346 | write_lock_bh(conn->recv_lock); |
| 347 | if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == |
| 348 | ISER_QP_MAX_REQ_DTOS) { |
| 349 | iser_dbg("%ld can't xmit task %p, suspending tx\n",jiffies,task); |
| 350 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
| 351 | rc = -EAGAIN; |
| 352 | } |
| 353 | write_unlock_bh(conn->recv_lock); |
| 354 | return rc; |
| 355 | } |
| 356 | |
| 357 | |
| 358 | /** |
| 359 | * iser_send_command - send command PDU |
| 360 | */ |
| 361 | int iser_send_command(struct iscsi_conn *conn, |
| 362 | struct iscsi_cmd_task *ctask) |
| 363 | { |
| 364 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 365 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 366 | struct iser_dto *send_dto = NULL; |
| 367 | unsigned long edtl; |
| 368 | int err = 0; |
| 369 | struct iser_data_buf *data_buf; |
| 370 | |
| 371 | struct iscsi_cmd *hdr = ctask->hdr; |
| 372 | struct scsi_cmnd *sc = ctask->sc; |
| 373 | |
| 374 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { |
| 375 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); |
| 376 | return -EPERM; |
| 377 | } |
| 378 | if (iser_check_xmit(conn, ctask)) |
| 379 | return -EAGAIN; |
| 380 | |
| 381 | edtl = ntohl(hdr->data_length); |
| 382 | |
| 383 | /* build the tx desc regd header and add it to the tx desc dto */ |
| 384 | iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND; |
| 385 | send_dto = &iser_ctask->desc.dto; |
| 386 | send_dto->ctask = iser_ctask; |
| 387 | iser_create_send_desc(iser_conn, &iser_ctask->desc); |
| 388 | |
| 389 | if (hdr->flags & ISCSI_FLAG_CMD_READ) |
| 390 | data_buf = &iser_ctask->data[ISER_DIR_IN]; |
| 391 | else |
| 392 | data_buf = &iser_ctask->data[ISER_DIR_OUT]; |
| 393 | |
| 394 | if (sc->use_sg) { /* using a scatter list */ |
| 395 | data_buf->buf = sc->request_buffer; |
| 396 | data_buf->size = sc->use_sg; |
| 397 | } else if (sc->request_bufflen) { |
| 398 | /* using a single buffer - convert it into one entry SG */ |
| 399 | sg_init_one(&data_buf->sg_single, |
| 400 | sc->request_buffer, sc->request_bufflen); |
| 401 | data_buf->buf = &data_buf->sg_single; |
| 402 | data_buf->size = 1; |
| 403 | } |
| 404 | |
| 405 | data_buf->data_len = sc->request_bufflen; |
| 406 | |
| 407 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { |
| 408 | err = iser_prepare_read_cmd(ctask, edtl); |
| 409 | if (err) |
| 410 | goto send_command_error; |
| 411 | } |
| 412 | if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { |
| 413 | err = iser_prepare_write_cmd(ctask, |
| 414 | ctask->imm_count, |
| 415 | ctask->imm_count + |
| 416 | ctask->unsol_count, |
| 417 | edtl); |
| 418 | if (err) |
| 419 | goto send_command_error; |
| 420 | } |
| 421 | |
| 422 | iser_reg_single(iser_conn->ib_conn->device, |
| 423 | send_dto->regd[0], DMA_TO_DEVICE); |
| 424 | |
| 425 | if (iser_post_receive_control(conn) != 0) { |
| 426 | iser_err("post_recv failed!\n"); |
| 427 | err = -ENOMEM; |
| 428 | goto send_command_error; |
| 429 | } |
| 430 | |
| 431 | iser_ctask->status = ISER_TASK_STATUS_STARTED; |
| 432 | |
| 433 | err = iser_post_send(&iser_ctask->desc); |
| 434 | if (!err) |
| 435 | return 0; |
| 436 | |
| 437 | send_command_error: |
| 438 | iser_dto_buffs_release(send_dto); |
| 439 | iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err); |
| 440 | return err; |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * iser_send_data_out - send data out PDU |
| 445 | */ |
| 446 | int iser_send_data_out(struct iscsi_conn *conn, |
| 447 | struct iscsi_cmd_task *ctask, |
| 448 | struct iscsi_data *hdr) |
| 449 | { |
| 450 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 451 | struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data; |
| 452 | struct iser_desc *tx_desc = NULL; |
| 453 | struct iser_dto *send_dto = NULL; |
| 454 | unsigned long buf_offset; |
| 455 | unsigned long data_seg_len; |
| 456 | unsigned int itt; |
| 457 | int err = 0; |
| 458 | |
| 459 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { |
| 460 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); |
| 461 | return -EPERM; |
| 462 | } |
| 463 | |
| 464 | if (iser_check_xmit(conn, ctask)) |
| 465 | return -EAGAIN; |
| 466 | |
| 467 | itt = ntohl(hdr->itt); |
| 468 | data_seg_len = ntoh24(hdr->dlength); |
| 469 | buf_offset = ntohl(hdr->offset); |
| 470 | |
| 471 | iser_dbg("%s itt %d dseg_len %d offset %d\n", |
| 472 | __func__,(int)itt,(int)data_seg_len,(int)buf_offset); |
| 473 | |
| 474 | tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); |
| 475 | if (tx_desc == NULL) { |
| 476 | iser_err("Failed to alloc desc for post dataout\n"); |
| 477 | return -ENOMEM; |
| 478 | } |
| 479 | |
| 480 | tx_desc->type = ISCSI_TX_DATAOUT; |
| 481 | memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); |
| 482 | |
| 483 | /* build the tx desc regd header and add it to the tx desc dto */ |
| 484 | send_dto = &tx_desc->dto; |
| 485 | send_dto->ctask = iser_ctask; |
| 486 | iser_create_send_desc(iser_conn, tx_desc); |
| 487 | |
| 488 | iser_reg_single(iser_conn->ib_conn->device, |
| 489 | send_dto->regd[0], DMA_TO_DEVICE); |
| 490 | |
| 491 | /* all data was registered for RDMA, we can use the lkey */ |
| 492 | iser_dto_add_regd_buff(send_dto, |
| 493 | &iser_ctask->rdma_regd[ISER_DIR_OUT], |
| 494 | buf_offset, |
| 495 | data_seg_len); |
| 496 | |
| 497 | if (buf_offset + data_seg_len > iser_ctask->data[ISER_DIR_OUT].data_len) { |
| 498 | iser_err("Offset:%ld & DSL:%ld in Data-Out " |
| 499 | "inconsistent with total len:%ld, itt:%d\n", |
| 500 | buf_offset, data_seg_len, |
| 501 | iser_ctask->data[ISER_DIR_OUT].data_len, itt); |
| 502 | err = -EINVAL; |
| 503 | goto send_data_out_error; |
| 504 | } |
| 505 | iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", |
| 506 | itt, buf_offset, data_seg_len); |
| 507 | |
| 508 | |
| 509 | err = iser_post_send(tx_desc); |
| 510 | if (!err) |
| 511 | return 0; |
| 512 | |
| 513 | send_data_out_error: |
| 514 | iser_dto_buffs_release(send_dto); |
| 515 | kmem_cache_free(ig.desc_cache, tx_desc); |
| 516 | iser_err("conn %p failed err %d\n",conn, err); |
| 517 | return err; |
| 518 | } |
| 519 | |
| 520 | int iser_send_control(struct iscsi_conn *conn, |
| 521 | struct iscsi_mgmt_task *mtask) |
| 522 | { |
| 523 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
| 524 | struct iser_desc *mdesc = mtask->dd_data; |
| 525 | struct iser_dto *send_dto = NULL; |
| 526 | unsigned int itt; |
| 527 | unsigned long data_seg_len; |
| 528 | int err = 0; |
| 529 | unsigned char opcode; |
| 530 | struct iser_regd_buf *regd_buf; |
| 531 | struct iser_device *device; |
| 532 | |
| 533 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { |
| 534 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); |
| 535 | return -EPERM; |
| 536 | } |
| 537 | |
| 538 | if (iser_check_xmit(conn,mtask)) |
| 539 | return -EAGAIN; |
| 540 | |
| 541 | /* build the tx desc regd header and add it to the tx desc dto */ |
| 542 | mdesc->type = ISCSI_TX_CONTROL; |
| 543 | send_dto = &mdesc->dto; |
| 544 | send_dto->ctask = NULL; |
| 545 | iser_create_send_desc(iser_conn, mdesc); |
| 546 | |
| 547 | device = iser_conn->ib_conn->device; |
| 548 | |
| 549 | iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE); |
| 550 | |
| 551 | itt = ntohl(mtask->hdr->itt); |
| 552 | opcode = mtask->hdr->opcode & ISCSI_OPCODE_MASK; |
| 553 | data_seg_len = ntoh24(mtask->hdr->dlength); |
| 554 | |
| 555 | if (data_seg_len > 0) { |
| 556 | regd_buf = &mdesc->data_regd_buf; |
| 557 | memset(regd_buf, 0, sizeof(struct iser_regd_buf)); |
| 558 | regd_buf->device = device; |
| 559 | regd_buf->virt_addr = mtask->data; |
| 560 | regd_buf->data_size = mtask->data_count; |
| 561 | iser_reg_single(device, regd_buf, |
| 562 | DMA_TO_DEVICE); |
| 563 | iser_dto_add_regd_buff(send_dto, regd_buf, |
| 564 | 0, |
| 565 | data_seg_len); |
| 566 | } |
| 567 | |
| 568 | if (iser_post_receive_control(conn) != 0) { |
| 569 | iser_err("post_rcv_buff failed!\n"); |
| 570 | err = -ENOMEM; |
| 571 | goto send_control_error; |
| 572 | } |
| 573 | |
| 574 | err = iser_post_send(mdesc); |
| 575 | if (!err) |
| 576 | return 0; |
| 577 | |
| 578 | send_control_error: |
| 579 | iser_dto_buffs_release(send_dto); |
| 580 | iser_err("conn %p failed err %d\n",conn, err); |
| 581 | return err; |
| 582 | } |
| 583 | |
| 584 | /** |
| 585 | * iser_rcv_dto_completion - recv DTO completion |
| 586 | */ |
| 587 | void iser_rcv_completion(struct iser_desc *rx_desc, |
| 588 | unsigned long dto_xfer_len) |
| 589 | { |
| 590 | struct iser_dto *dto = &rx_desc->dto; |
| 591 | struct iscsi_iser_conn *conn = dto->conn; |
| 592 | struct iscsi_session *session = conn->iscsi_conn->session; |
| 593 | struct iscsi_cmd_task *ctask; |
| 594 | struct iscsi_iser_cmd_task *iser_ctask; |
| 595 | struct iscsi_hdr *hdr; |
| 596 | char *rx_data = NULL; |
| 597 | int rx_data_len = 0; |
| 598 | unsigned int itt; |
| 599 | unsigned char opcode; |
| 600 | |
| 601 | hdr = &rx_desc->iscsi_header; |
| 602 | |
| 603 | iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt); |
| 604 | |
| 605 | if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */ |
| 606 | rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN; |
| 607 | rx_data = dto->regd[1]->virt_addr; |
| 608 | rx_data += dto->offset[1]; |
| 609 | } |
| 610 | |
| 611 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
| 612 | |
| 613 | if (opcode == ISCSI_OP_SCSI_CMD_RSP) { |
| 614 | itt = hdr->itt & ISCSI_ITT_MASK; /* mask out cid and age bits */ |
| 615 | if (!(itt < session->cmds_max)) |
| 616 | iser_err("itt can't be matched to task!!!" |
| 617 | "conn %p opcode %d cmds_max %d itt %d\n", |
| 618 | conn->iscsi_conn,opcode,session->cmds_max,itt); |
| 619 | /* use the mapping given with the cmds array indexed by itt */ |
| 620 | ctask = (struct iscsi_cmd_task *)session->cmds[itt]; |
| 621 | iser_ctask = ctask->dd_data; |
| 622 | iser_dbg("itt %d ctask %p\n",itt,ctask); |
| 623 | iser_ctask->status = ISER_TASK_STATUS_COMPLETED; |
| 624 | iser_ctask_rdma_finalize(iser_ctask); |
| 625 | } |
| 626 | |
| 627 | iser_dto_buffs_release(dto); |
| 628 | |
| 629 | iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len); |
| 630 | |
| 631 | kfree(rx_desc->data); |
| 632 | kmem_cache_free(ig.desc_cache, rx_desc); |
| 633 | |
| 634 | /* decrementing conn->post_recv_buf_count only --after-- freeing the * |
| 635 | * task eliminates the need to worry on tasks which are completed in * |
| 636 | * parallel to the execution of iser_conn_term. So the code that waits * |
| 637 | * for the posted rx bufs refcount to become zero handles everything */ |
| 638 | atomic_dec(&conn->ib_conn->post_recv_buf_count); |
| 639 | } |
| 640 | |
| 641 | void iser_snd_completion(struct iser_desc *tx_desc) |
| 642 | { |
| 643 | struct iser_dto *dto = &tx_desc->dto; |
| 644 | struct iscsi_iser_conn *iser_conn = dto->conn; |
| 645 | struct iscsi_conn *conn = iser_conn->iscsi_conn; |
| 646 | struct iscsi_mgmt_task *mtask; |
| 647 | |
| 648 | iser_dbg("Initiator, Data sent dto=0x%p\n", dto); |
| 649 | |
| 650 | iser_dto_buffs_release(dto); |
| 651 | |
| 652 | if (tx_desc->type == ISCSI_TX_DATAOUT) |
| 653 | kmem_cache_free(ig.desc_cache, tx_desc); |
| 654 | |
| 655 | atomic_dec(&iser_conn->ib_conn->post_send_buf_count); |
| 656 | |
| 657 | write_lock(conn->recv_lock); |
| 658 | if (conn->suspend_tx) { |
| 659 | iser_dbg("%ld resuming tx\n",jiffies); |
| 660 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
| 661 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
| 662 | } |
| 663 | write_unlock(conn->recv_lock); |
| 664 | |
| 665 | if (tx_desc->type == ISCSI_TX_CONTROL) { |
| 666 | /* this arithmetic is legal by libiscsi dd_data allocation */ |
| 667 | mtask = (void *) ((long)(void *)tx_desc - |
| 668 | sizeof(struct iscsi_mgmt_task)); |
| 669 | if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
| 670 | struct iscsi_session *session = conn->session; |
| 671 | |
| 672 | spin_lock(&conn->session->lock); |
| 673 | list_del(&mtask->running); |
| 674 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
| 675 | sizeof(void*)); |
| 676 | spin_unlock(&session->lock); |
| 677 | } |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *iser_ctask) |
| 682 | |
| 683 | { |
| 684 | iser_ctask->status = ISER_TASK_STATUS_INIT; |
| 685 | |
| 686 | iser_ctask->dir[ISER_DIR_IN] = 0; |
| 687 | iser_ctask->dir[ISER_DIR_OUT] = 0; |
| 688 | |
| 689 | iser_ctask->data[ISER_DIR_IN].data_len = 0; |
| 690 | iser_ctask->data[ISER_DIR_OUT].data_len = 0; |
| 691 | |
| 692 | memset(&iser_ctask->rdma_regd[ISER_DIR_IN], 0, |
| 693 | sizeof(struct iser_regd_buf)); |
| 694 | memset(&iser_ctask->rdma_regd[ISER_DIR_OUT], 0, |
| 695 | sizeof(struct iser_regd_buf)); |
| 696 | } |
| 697 | |
| 698 | void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *iser_ctask) |
| 699 | { |
| 700 | int deferred; |
| 701 | |
| 702 | /* if we were reading, copy back to unaligned sglist, |
| 703 | * anyway dma_unmap and free the copy |
| 704 | */ |
| 705 | if (iser_ctask->data_copy[ISER_DIR_IN].copy_buf != NULL) |
| 706 | iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_IN); |
| 707 | if (iser_ctask->data_copy[ISER_DIR_OUT].copy_buf != NULL) |
| 708 | iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_OUT); |
| 709 | |
| 710 | if (iser_ctask->dir[ISER_DIR_IN]) { |
| 711 | deferred = iser_regd_buff_release |
| 712 | (&iser_ctask->rdma_regd[ISER_DIR_IN]); |
| 713 | if (deferred) { |
| 714 | iser_err("References remain for BUF-IN rdma reg\n"); |
| 715 | BUG(); |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | if (iser_ctask->dir[ISER_DIR_OUT]) { |
| 720 | deferred = iser_regd_buff_release |
| 721 | (&iser_ctask->rdma_regd[ISER_DIR_OUT]); |
| 722 | if (deferred) { |
| 723 | iser_err("References remain for BUF-OUT rdma reg\n"); |
| 724 | BUG(); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | iser_dma_unmap_task_data(iser_ctask); |
| 729 | } |
| 730 | |
| 731 | void iser_dto_buffs_release(struct iser_dto *dto) |
| 732 | { |
| 733 | int i; |
| 734 | |
| 735 | for (i = 0; i < dto->regd_vector_len; i++) |
| 736 | iser_regd_buff_release(dto->regd[i]); |
| 737 | } |
| 738 | |