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1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB2/*3 * Copyright (c) 2013-2018, Mellanox Technologies inc. All rights reserved.4 */5 6#include <linux/mlx5/qp.h>7#include <linux/slab.h>8#include <rdma/ib_umem.h>9#include <rdma/ib_user_verbs.h>10#include "mlx5_ib.h"11#include "srq.h"12 13static void *get_wqe(struct mlx5_ib_srq *srq, int n)14{15 return mlx5_frag_buf_get_wqe(&srq->fbc, n);16}17 18static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)19{20 struct ib_event event;21 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;22 23 if (ibsrq->event_handler) {24 event.device = ibsrq->device;25 event.element.srq = ibsrq;26 switch (type) {27 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:28 event.event = IB_EVENT_SRQ_LIMIT_REACHED;29 break;30 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:31 event.event = IB_EVENT_SRQ_ERR;32 break;33 default:34 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",35 type, srq->srqn);36 return;37 }38 39 ibsrq->event_handler(&event, ibsrq->srq_context);40 }41}42 43static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,44 struct mlx5_srq_attr *in,45 struct ib_udata *udata, int buf_size)46{47 struct mlx5_ib_dev *dev = to_mdev(pd->device);48 struct mlx5_ib_create_srq ucmd = {};49 struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(50 udata, struct mlx5_ib_ucontext, ibucontext);51 size_t ucmdlen;52 int err;53 u32 uidx = MLX5_IB_DEFAULT_UIDX;54 55 ucmdlen = min(udata->inlen, sizeof(ucmd));56 57 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {58 mlx5_ib_dbg(dev, "failed copy udata\n");59 return -EFAULT;60 }61 62 if (ucmd.reserved0 || ucmd.reserved1)63 return -EINVAL;64 65 if (udata->inlen > sizeof(ucmd) &&66 !ib_is_udata_cleared(udata, sizeof(ucmd),67 udata->inlen - sizeof(ucmd)))68 return -EINVAL;69 70 if (in->type != IB_SRQT_BASIC) {71 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);72 if (err)73 return err;74 }75 76 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);77 78 srq->umem = ib_umem_get(pd->device, ucmd.buf_addr, buf_size, 0);79 if (IS_ERR(srq->umem)) {80 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);81 err = PTR_ERR(srq->umem);82 return err;83 }84 in->umem = srq->umem;85 86 err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);87 if (err) {88 mlx5_ib_dbg(dev, "map doorbell failed\n");89 goto err_umem;90 }91 92 in->uid = (in->type != IB_SRQT_XRC) ? to_mpd(pd)->uid : 0;93 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&94 in->type != IB_SRQT_BASIC)95 in->user_index = uidx;96 97 return 0;98 99err_umem:100 ib_umem_release(srq->umem);101 102 return err;103}104 105static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,106 struct mlx5_srq_attr *in, int buf_size)107{108 int err;109 int i;110 struct mlx5_wqe_srq_next_seg *next;111 112 err = mlx5_db_alloc(dev->mdev, &srq->db);113 if (err) {114 mlx5_ib_warn(dev, "alloc dbell rec failed\n");115 return err;116 }117 118 if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,119 dev->mdev->priv.numa_node)) {120 mlx5_ib_dbg(dev, "buf alloc failed\n");121 err = -ENOMEM;122 goto err_db;123 }124 125 mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),126 &srq->fbc);127 128 srq->head = 0;129 srq->tail = srq->msrq.max - 1;130 srq->wqe_ctr = 0;131 132 for (i = 0; i < srq->msrq.max; i++) {133 next = get_wqe(srq, i);134 next->next_wqe_index =135 cpu_to_be16((i + 1) & (srq->msrq.max - 1));136 }137 138 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);139 in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);140 if (!in->pas) {141 err = -ENOMEM;142 goto err_buf;143 }144 mlx5_fill_page_frag_array(&srq->buf, in->pas);145 146 srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);147 if (!srq->wrid) {148 err = -ENOMEM;149 goto err_in;150 }151 srq->wq_sig = 0;152 153 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;154 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&155 in->type != IB_SRQT_BASIC)156 in->user_index = MLX5_IB_DEFAULT_UIDX;157 158 return 0;159 160err_in:161 kvfree(in->pas);162 163err_buf:164 mlx5_frag_buf_free(dev->mdev, &srq->buf);165 166err_db:167 mlx5_db_free(dev->mdev, &srq->db);168 return err;169}170 171static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,172 struct ib_udata *udata)173{174 mlx5_ib_db_unmap_user(175 rdma_udata_to_drv_context(176 udata,177 struct mlx5_ib_ucontext,178 ibucontext),179 &srq->db);180 ib_umem_release(srq->umem);181}182 183 184static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)185{186 kvfree(srq->wrid);187 mlx5_frag_buf_free(dev->mdev, &srq->buf);188 mlx5_db_free(dev->mdev, &srq->db);189}190 191int mlx5_ib_create_srq(struct ib_srq *ib_srq,192 struct ib_srq_init_attr *init_attr,193 struct ib_udata *udata)194{195 struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);196 struct mlx5_ib_srq *srq = to_msrq(ib_srq);197 size_t desc_size;198 size_t buf_size;199 int err;200 struct mlx5_srq_attr in = {};201 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);202 __u32 max_sge_sz = MLX5_CAP_GEN(dev->mdev, max_wqe_sz_rq) /203 sizeof(struct mlx5_wqe_data_seg);204 205 if (init_attr->srq_type != IB_SRQT_BASIC &&206 init_attr->srq_type != IB_SRQT_XRC &&207 init_attr->srq_type != IB_SRQT_TM)208 return -EOPNOTSUPP;209 210 /* Sanity check SRQ and sge size before proceeding */211 if (init_attr->attr.max_wr >= max_srq_wqes ||212 init_attr->attr.max_sge > max_sge_sz) {213 mlx5_ib_dbg(dev, "max_wr %d,wr_cap %d,max_sge %d, sge_cap:%d\n",214 init_attr->attr.max_wr, max_srq_wqes,215 init_attr->attr.max_sge, max_sge_sz);216 return -EINVAL;217 }218 219 err = mlx5_ib_dev_res_cq_init(dev);220 if (err)221 return err;222 223 mutex_init(&srq->mutex);224 spin_lock_init(&srq->lock);225 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);226 srq->msrq.max_gs = init_attr->attr.max_sge;227 228 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +229 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);230 if (desc_size == 0 || srq->msrq.max_gs > desc_size)231 return -EINVAL;232 233 desc_size = roundup_pow_of_two(desc_size);234 desc_size = max_t(size_t, 32, desc_size);235 if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))236 return -EINVAL;237 238 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /239 sizeof(struct mlx5_wqe_data_seg);240 srq->msrq.wqe_shift = ilog2(desc_size);241 buf_size = srq->msrq.max * desc_size;242 if (buf_size < desc_size)243 return -EINVAL;244 245 in.type = init_attr->srq_type;246 247 if (udata)248 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);249 else250 err = create_srq_kernel(dev, srq, &in, buf_size);251 252 if (err) {253 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",254 udata ? "user" : "kernel", err);255 return err;256 }257 258 in.log_size = ilog2(srq->msrq.max);259 in.wqe_shift = srq->msrq.wqe_shift - 4;260 if (srq->wq_sig)261 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;262 263 if (init_attr->srq_type == IB_SRQT_XRC && init_attr->ext.xrc.xrcd)264 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;265 else266 in.xrcd = dev->devr.xrcdn0;267 268 if (init_attr->srq_type == IB_SRQT_TM) {269 in.tm_log_list_size =270 ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;271 if (in.tm_log_list_size >272 MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {273 mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");274 err = -EINVAL;275 goto err_usr_kern_srq;276 }277 in.flags |= MLX5_SRQ_FLAG_RNDV;278 }279 280 if (ib_srq_has_cq(init_attr->srq_type))281 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;282 else283 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;284 285 in.pd = to_mpd(ib_srq->pd)->pdn;286 in.db_record = srq->db.dma;287 err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);288 kvfree(in.pas);289 if (err) {290 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);291 goto err_usr_kern_srq;292 }293 294 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);295 296 srq->msrq.event = mlx5_ib_srq_event;297 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;298 299 if (udata) {300 struct mlx5_ib_create_srq_resp resp = {301 .srqn = srq->msrq.srqn,302 };303 304 if (ib_copy_to_udata(udata, &resp, min(udata->outlen,305 sizeof(resp)))) {306 mlx5_ib_dbg(dev, "copy to user failed\n");307 err = -EFAULT;308 goto err_core;309 }310 }311 312 init_attr->attr.max_wr = srq->msrq.max - 1;313 314 return 0;315 316err_core:317 mlx5_cmd_destroy_srq(dev, &srq->msrq);318 319err_usr_kern_srq:320 if (udata)321 destroy_srq_user(ib_srq->pd, srq, udata);322 else323 destroy_srq_kernel(dev, srq);324 325 return err;326}327 328int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,329 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)330{331 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);332 struct mlx5_ib_srq *srq = to_msrq(ibsrq);333 int ret;334 335 /* We don't support resizing SRQs yet */336 if (attr_mask & IB_SRQ_MAX_WR)337 return -EINVAL;338 339 if (attr_mask & IB_SRQ_LIMIT) {340 if (attr->srq_limit >= srq->msrq.max)341 return -EINVAL;342 343 mutex_lock(&srq->mutex);344 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);345 mutex_unlock(&srq->mutex);346 347 if (ret)348 return ret;349 }350 351 return 0;352}353 354int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)355{356 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);357 struct mlx5_ib_srq *srq = to_msrq(ibsrq);358 int ret;359 struct mlx5_srq_attr *out;360 361 out = kzalloc(sizeof(*out), GFP_KERNEL);362 if (!out)363 return -ENOMEM;364 365 ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);366 if (ret)367 goto out_box;368 369 srq_attr->srq_limit = out->lwm;370 srq_attr->max_wr = srq->msrq.max - 1;371 srq_attr->max_sge = srq->msrq.max_gs;372 373out_box:374 kfree(out);375 return ret;376}377 378int mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)379{380 struct mlx5_ib_dev *dev = to_mdev(srq->device);381 struct mlx5_ib_srq *msrq = to_msrq(srq);382 int ret;383 384 ret = mlx5_cmd_destroy_srq(dev, &msrq->msrq);385 if (ret)386 return ret;387 388 if (udata)389 destroy_srq_user(srq->pd, msrq, udata);390 else391 destroy_srq_kernel(dev, msrq);392 return 0;393}394 395void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)396{397 struct mlx5_wqe_srq_next_seg *next;398 399 /* always called with interrupts disabled. */400 spin_lock(&srq->lock);401 402 next = get_wqe(srq, srq->tail);403 next->next_wqe_index = cpu_to_be16(wqe_index);404 srq->tail = wqe_index;405 406 spin_unlock(&srq->lock);407}408 409int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,410 const struct ib_recv_wr **bad_wr)411{412 struct mlx5_ib_srq *srq = to_msrq(ibsrq);413 struct mlx5_wqe_srq_next_seg *next;414 struct mlx5_wqe_data_seg *scat;415 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);416 struct mlx5_core_dev *mdev = dev->mdev;417 unsigned long flags;418 int err = 0;419 int nreq;420 int i;421 422 spin_lock_irqsave(&srq->lock, flags);423 424 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {425 err = -EIO;426 *bad_wr = wr;427 goto out;428 }429 430 for (nreq = 0; wr; nreq++, wr = wr->next) {431 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {432 err = -EINVAL;433 *bad_wr = wr;434 break;435 }436 437 if (unlikely(srq->head == srq->tail)) {438 err = -ENOMEM;439 *bad_wr = wr;440 break;441 }442 443 srq->wrid[srq->head] = wr->wr_id;444 445 next = get_wqe(srq, srq->head);446 srq->head = be16_to_cpu(next->next_wqe_index);447 scat = (struct mlx5_wqe_data_seg *)(next + 1);448 449 for (i = 0; i < wr->num_sge; i++) {450 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);451 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);452 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);453 }454 455 if (i < srq->msrq.max_avail_gather) {456 scat[i].byte_count = 0;457 scat[i].lkey = dev->mkeys.terminate_scatter_list_mkey;458 scat[i].addr = 0;459 }460 }461 462 if (likely(nreq)) {463 srq->wqe_ctr += nreq;464 465 /* Make sure that descriptors are written before466 * doorbell record.467 */468 wmb();469 470 *srq->db.db = cpu_to_be32(srq->wqe_ctr);471 }472out:473 spin_unlock_irqrestore(&srq->lock, flags);474 475 return err;476}477