1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 #include <linux/kernel.h> 34 #include <linux/slab.h> 35 #include <linux/mm.h> 36 #include <linux/highmem.h> 37 #include <linux/scatterlist.h> 38 39 #include "iscsi_iser.h" 40 41 void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc) 42 { 43 iser_err_comp(wc, "memreg"); 44 } 45 46 static struct iser_fr_desc *iser_reg_desc_get_fr(struct ib_conn *ib_conn) 47 { 48 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 49 struct iser_fr_desc *desc; 50 unsigned long flags; 51 52 spin_lock_irqsave(&fr_pool->lock, flags); 53 desc = list_first_entry(&fr_pool->list, 54 struct iser_fr_desc, list); 55 list_del(&desc->list); 56 spin_unlock_irqrestore(&fr_pool->lock, flags); 57 58 return desc; 59 } 60 61 static void iser_reg_desc_put_fr(struct ib_conn *ib_conn, 62 struct iser_fr_desc *desc) 63 { 64 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 65 unsigned long flags; 66 67 spin_lock_irqsave(&fr_pool->lock, flags); 68 list_add(&desc->list, &fr_pool->list); 69 spin_unlock_irqrestore(&fr_pool->lock, flags); 70 } 71 72 int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, 73 enum iser_data_dir iser_dir, 74 enum dma_data_direction dma_dir) 75 { 76 struct iser_data_buf *data = &iser_task->data[iser_dir]; 77 struct ib_device *dev; 78 79 iser_task->dir[iser_dir] = 1; 80 dev = iser_task->iser_conn->ib_conn.device->ib_device; 81 82 data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir); 83 if (unlikely(data->dma_nents == 0)) { 84 iser_err("dma_map_sg failed!!!\n"); 85 return -EINVAL; 86 } 87 88 if (scsi_prot_sg_count(iser_task->sc)) { 89 struct iser_data_buf *pdata = &iser_task->prot[iser_dir]; 90 91 pdata->dma_nents = ib_dma_map_sg(dev, pdata->sg, pdata->size, dma_dir); 92 if (unlikely(pdata->dma_nents == 0)) { 93 iser_err("protection dma_map_sg failed!!!\n"); 94 goto out_unmap; 95 } 96 } 97 98 return 0; 99 100 out_unmap: 101 ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir); 102 return -EINVAL; 103 } 104 105 106 void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, 107 enum iser_data_dir iser_dir, 108 enum dma_data_direction dma_dir) 109 { 110 struct iser_data_buf *data = &iser_task->data[iser_dir]; 111 struct ib_device *dev; 112 113 dev = iser_task->iser_conn->ib_conn.device->ib_device; 114 ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir); 115 116 if (scsi_prot_sg_count(iser_task->sc)) { 117 struct iser_data_buf *pdata = &iser_task->prot[iser_dir]; 118 119 ib_dma_unmap_sg(dev, pdata->sg, pdata->size, dma_dir); 120 } 121 } 122 123 static int iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem, 124 struct iser_mem_reg *reg) 125 { 126 struct scatterlist *sg = mem->sg; 127 128 reg->sge.lkey = device->pd->local_dma_lkey; 129 /* 130 * FIXME: rework the registration code path to differentiate 131 * rkey/lkey use cases 132 */ 133 134 if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) 135 reg->rkey = device->pd->unsafe_global_rkey; 136 else 137 reg->rkey = 0; 138 reg->sge.addr = sg_dma_address(&sg[0]); 139 reg->sge.length = sg_dma_len(&sg[0]); 140 141 iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx," 142 " length=0x%x\n", reg->sge.lkey, reg->rkey, 143 reg->sge.addr, reg->sge.length); 144 145 return 0; 146 } 147 148 void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, 149 enum iser_data_dir cmd_dir) 150 { 151 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 152 struct iser_fr_desc *desc; 153 struct ib_mr_status mr_status; 154 155 desc = reg->desc; 156 if (!desc) 157 return; 158 159 /* 160 * The signature MR cannot be invalidated and reused without checking. 161 * libiscsi calls the check_protection transport handler only if 162 * SCSI-Response is received. And the signature MR is not checked if 163 * the task is completed for some other reason like a timeout or error 164 * handling. That's why we must check the signature MR here before 165 * putting it to the free pool. 166 */ 167 if (unlikely(desc->sig_protected)) { 168 desc->sig_protected = false; 169 ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS, 170 &mr_status); 171 } 172 iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc); 173 reg->desc = NULL; 174 } 175 176 static void iser_set_dif_domain(struct scsi_cmnd *sc, 177 struct ib_sig_domain *domain) 178 { 179 domain->sig_type = IB_SIG_TYPE_T10_DIF; 180 domain->sig.dif.pi_interval = scsi_prot_interval(sc); 181 domain->sig.dif.ref_tag = t10_pi_ref_tag(scsi_cmd_to_rq(sc)); 182 /* 183 * At the moment we hard code those, but in the future 184 * we will take them from sc. 185 */ 186 domain->sig.dif.apptag_check_mask = 0xffff; 187 domain->sig.dif.app_escape = true; 188 domain->sig.dif.ref_escape = true; 189 if (sc->prot_flags & SCSI_PROT_REF_INCREMENT) 190 domain->sig.dif.ref_remap = true; 191 } 192 193 static int iser_set_sig_attrs(struct scsi_cmnd *sc, 194 struct ib_sig_attrs *sig_attrs) 195 { 196 switch (scsi_get_prot_op(sc)) { 197 case SCSI_PROT_WRITE_INSERT: 198 case SCSI_PROT_READ_STRIP: 199 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; 200 iser_set_dif_domain(sc, &sig_attrs->wire); 201 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC; 202 break; 203 case SCSI_PROT_READ_INSERT: 204 case SCSI_PROT_WRITE_STRIP: 205 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; 206 iser_set_dif_domain(sc, &sig_attrs->mem); 207 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ? 208 IB_T10DIF_CSUM : IB_T10DIF_CRC; 209 break; 210 case SCSI_PROT_READ_PASS: 211 case SCSI_PROT_WRITE_PASS: 212 iser_set_dif_domain(sc, &sig_attrs->wire); 213 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC; 214 iser_set_dif_domain(sc, &sig_attrs->mem); 215 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ? 216 IB_T10DIF_CSUM : IB_T10DIF_CRC; 217 break; 218 default: 219 iser_err("Unsupported PI operation %d\n", 220 scsi_get_prot_op(sc)); 221 return -EINVAL; 222 } 223 224 return 0; 225 } 226 227 static inline void iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask) 228 { 229 *mask = 0; 230 if (sc->prot_flags & SCSI_PROT_REF_CHECK) 231 *mask |= IB_SIG_CHECK_REFTAG; 232 if (sc->prot_flags & SCSI_PROT_GUARD_CHECK) 233 *mask |= IB_SIG_CHECK_GUARD; 234 } 235 236 static inline void iser_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr, 237 struct ib_cqe *cqe, struct ib_send_wr *next_wr) 238 { 239 inv_wr->opcode = IB_WR_LOCAL_INV; 240 inv_wr->wr_cqe = cqe; 241 inv_wr->ex.invalidate_rkey = mr->rkey; 242 inv_wr->send_flags = 0; 243 inv_wr->num_sge = 0; 244 inv_wr->next = next_wr; 245 } 246 247 static int iser_reg_sig_mr(struct iscsi_iser_task *iser_task, 248 struct iser_data_buf *mem, 249 struct iser_data_buf *sig_mem, 250 struct iser_reg_resources *rsc, 251 struct iser_mem_reg *sig_reg) 252 { 253 struct iser_tx_desc *tx_desc = &iser_task->desc; 254 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe; 255 struct ib_mr *mr = rsc->sig_mr; 256 struct ib_sig_attrs *sig_attrs = mr->sig_attrs; 257 struct ib_reg_wr *wr = &tx_desc->reg_wr; 258 int ret; 259 260 memset(sig_attrs, 0, sizeof(*sig_attrs)); 261 ret = iser_set_sig_attrs(iser_task->sc, sig_attrs); 262 if (ret) 263 goto err; 264 265 iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask); 266 267 if (rsc->sig_mr->need_inval) 268 iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr); 269 270 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey)); 271 272 ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL, 273 sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K); 274 if (unlikely(ret)) { 275 iser_err("failed to map PI sg (%d)\n", 276 mem->dma_nents + sig_mem->dma_nents); 277 goto err; 278 } 279 280 memset(wr, 0, sizeof(*wr)); 281 wr->wr.next = &tx_desc->send_wr; 282 wr->wr.opcode = IB_WR_REG_MR_INTEGRITY; 283 wr->wr.wr_cqe = cqe; 284 wr->wr.num_sge = 0; 285 wr->wr.send_flags = 0; 286 wr->mr = mr; 287 wr->key = mr->rkey; 288 wr->access = IB_ACCESS_LOCAL_WRITE | 289 IB_ACCESS_REMOTE_READ | 290 IB_ACCESS_REMOTE_WRITE; 291 rsc->sig_mr->need_inval = true; 292 293 sig_reg->sge.lkey = mr->lkey; 294 sig_reg->rkey = mr->rkey; 295 sig_reg->sge.addr = mr->iova; 296 sig_reg->sge.length = mr->length; 297 298 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n", 299 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr, 300 sig_reg->sge.length); 301 err: 302 return ret; 303 } 304 305 static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task, 306 struct iser_data_buf *mem, 307 struct iser_reg_resources *rsc, 308 struct iser_mem_reg *reg) 309 { 310 struct iser_tx_desc *tx_desc = &iser_task->desc; 311 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe; 312 struct ib_mr *mr = rsc->mr; 313 struct ib_reg_wr *wr = &tx_desc->reg_wr; 314 int n; 315 316 if (rsc->mr->need_inval) 317 iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr); 318 319 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey)); 320 321 n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SZ_4K); 322 if (unlikely(n != mem->dma_nents)) { 323 iser_err("failed to map sg (%d/%d)\n", 324 n, mem->dma_nents); 325 return n < 0 ? n : -EINVAL; 326 } 327 328 wr->wr.next = &tx_desc->send_wr; 329 wr->wr.opcode = IB_WR_REG_MR; 330 wr->wr.wr_cqe = cqe; 331 wr->wr.send_flags = 0; 332 wr->wr.num_sge = 0; 333 wr->mr = mr; 334 wr->key = mr->rkey; 335 wr->access = IB_ACCESS_LOCAL_WRITE | 336 IB_ACCESS_REMOTE_WRITE | 337 IB_ACCESS_REMOTE_READ; 338 339 rsc->mr->need_inval = true; 340 341 reg->sge.lkey = mr->lkey; 342 reg->rkey = mr->rkey; 343 reg->sge.addr = mr->iova; 344 reg->sge.length = mr->length; 345 346 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n", 347 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length); 348 349 return 0; 350 } 351 352 int iser_reg_mem_fastreg(struct iscsi_iser_task *task, 353 enum iser_data_dir dir, 354 bool all_imm) 355 { 356 struct ib_conn *ib_conn = &task->iser_conn->ib_conn; 357 struct iser_device *device = ib_conn->device; 358 struct iser_data_buf *mem = &task->data[dir]; 359 struct iser_mem_reg *reg = &task->rdma_reg[dir]; 360 struct iser_fr_desc *desc; 361 bool use_dma_key; 362 int err; 363 364 use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) && 365 scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL; 366 if (use_dma_key) 367 return iser_reg_dma(device, mem, reg); 368 369 desc = iser_reg_desc_get_fr(ib_conn); 370 if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) { 371 err = iser_fast_reg_mr(task, mem, &desc->rsc, reg); 372 if (unlikely(err)) 373 goto err_reg; 374 } else { 375 err = iser_reg_sig_mr(task, mem, &task->prot[dir], 376 &desc->rsc, reg); 377 if (unlikely(err)) 378 goto err_reg; 379 380 desc->sig_protected = true; 381 } 382 383 reg->desc = desc; 384 385 return 0; 386 387 err_reg: 388 iser_reg_desc_put_fr(ib_conn, desc); 389 390 return err; 391 } 392