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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 two6 * licenses. You may choose to be licensed under the terms of the GNU7 * General Public License (GPL) Version 2, available from the file8 * COPYING in the main directory of this source tree, or the9 * OpenIB.org BSD license below:10 *11 * Redistribution and use in source and binary forms, with or12 * without modification, are permitted provided that the following13 * conditions are met:14 *15 * - Redistributions of source code must retain the above16 * copyright notice, this list of conditions and the following17 * disclaimer.18 *19 * - Redistributions in binary form must reproduce the above20 * copyright notice, this list of conditions and the following21 * disclaimer in the documentation and/or other materials22 * 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 OF26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE31 * 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 41void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)42{43 iser_err_comp(wc, "memreg");44}45 46static 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 61static 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 72int 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 100out_unmap:101 ib_dma_unmap_sg(dev, data->sg, data->size, dma_dir);102 return -EINVAL;103}104 105 106void 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 123static 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 differentiate131 * rkey/lkey use cases132 */133 134 if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)135 reg->rkey = device->pd->unsafe_global_rkey;136 else137 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 148void 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 if162 * SCSI-Response is received. And the signature MR is not checked if163 * the task is completed for some other reason like a timeout or error164 * handling. That's why we must check the signature MR here before165 * 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 176static 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 future184 * 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 193static 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 227static 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 236static 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 247static 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);301err:302 return ret;303}304 305static 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 352int 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 387err_reg:388 iser_reg_desc_put_fr(ib_conn, desc);389 390 return err;391}392