mthca_srq.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*
    2  * Copyright (c) 2005 Cisco Systems. 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 
   33 #include <linux/slab.h>
   34 #include <linux/string.h>
   35 #include <linux/sched.h>
   36 
   37 #include <asm/io.h>
   38 
   39 #include "mthca_dev.h"
   40 #include "mthca_cmd.h"
   41 #include "mthca_memfree.h"
   42 #include "mthca_wqe.h"
   43 
   44 enum {
   45         MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE
   46 };
   47 
   48 struct mthca_tavor_srq_context {
   49         __be64 wqe_base_ds;     /* low 6 bits is descriptor size */
   50         __be32 state_pd;
   51         __be32 lkey;
   52         __be32 uar;
   53         __be16 limit_watermark;
   54         __be16 wqe_cnt;
   55         u32    reserved[2];
   56 };
   57 
   58 struct mthca_arbel_srq_context {
   59         __be32 state_logsize_srqn;
   60         __be32 lkey;
   61         __be32 db_index;
   62         __be32 logstride_usrpage;
   63         __be64 wqe_base;
   64         __be32 eq_pd;
   65         __be16 limit_watermark;
   66         __be16 wqe_cnt;
   67         u16    reserved1;
   68         __be16 wqe_counter;
   69         u32    reserved2[3];
   70 };
   71 
   72 static void *get_wqe(struct mthca_srq *srq, int n)
   73 {
   74         if (srq->is_direct)
   75                 return srq->queue.direct.buf + (n << srq->wqe_shift);
   76         else
   77                 return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf +
   78                         ((n << srq->wqe_shift) & (PAGE_SIZE - 1));
   79 }
   80 
   81 /*
   82  * Return a pointer to the location within a WQE that we're using as a
   83  * link when the WQE is in the free list.  We use the imm field
   84  * because in the Tavor case, posting a WQE may overwrite the next
   85  * segment of the previous WQE, but a receive WQE will never touch the
   86  * imm field.  This avoids corrupting our free list if the previous
   87  * WQE has already completed and been put on the free list when we
   88  * post the next WQE.
   89  */
   90 static inline int *wqe_to_link(void *wqe)
   91 {
   92         return (int *) (wqe + offsetof(struct mthca_next_seg, imm));
   93 }
   94 
   95 static void mthca_tavor_init_srq_context(struct mthca_dev *dev,
   96                                          struct mthca_pd *pd,
   97                                          struct mthca_srq *srq,
   98                                          struct mthca_tavor_srq_context *context)
   99 {
  100         memset(context, 0, sizeof *context);
  101 
  102         context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4));
  103         context->state_pd    = cpu_to_be32(pd->pd_num);
  104         context->lkey        = cpu_to_be32(srq->mr.ibmr.lkey);
  105 
  106         if (pd->ibpd.uobject)
  107                 context->uar =
  108                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
  109         else
  110                 context->uar = cpu_to_be32(dev->driver_uar.index);
  111 }
  112 
  113 static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
  114                                          struct mthca_pd *pd,
  115                                          struct mthca_srq *srq,
  116                                          struct mthca_arbel_srq_context *context)
  117 {
  118         int logsize, max;
  119 
  120         memset(context, 0, sizeof *context);
  121 
  122         /*
  123          * Put max in a temporary variable to work around gcc bug
  124          * triggered by ilog2() on sparc64.
  125          */
  126         max = srq->max;
  127         logsize = ilog2(max);
  128         context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
  129         context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
  130         context->db_index = cpu_to_be32(srq->db_index);
  131         context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29);
  132         if (pd->ibpd.uobject)
  133                 context->logstride_usrpage |=
  134                         cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index);
  135         else
  136                 context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index);
  137         context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num);
  138 }
  139 
  140 static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq)
  141 {
  142         mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue,
  143                        srq->is_direct, &srq->mr);
  144         kfree(srq->wrid);
  145 }
  146 
  147 static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd,
  148                                struct mthca_srq *srq)
  149 {
  150         struct mthca_data_seg *scatter;
  151         void *wqe;
  152         int err;
  153         int i;
  154 
  155         if (pd->ibpd.uobject)
  156                 return 0;
  157 
  158         srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL);
  159         if (!srq->wrid)
  160                 return -ENOMEM;
  161 
  162         err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift,
  163                               MTHCA_MAX_DIRECT_SRQ_SIZE,
  164                               &srq->queue, &srq->is_direct, pd, 1, &srq->mr);
  165         if (err) {
  166                 kfree(srq->wrid);
  167                 return err;
  168         }
  169 
  170         /*
  171          * Now initialize the SRQ buffer so that all of the WQEs are
  172          * linked into the list of free WQEs.  In addition, set the
  173          * scatter list L_Keys to the sentry value of 0x100.
  174          */
  175         for (i = 0; i < srq->max; ++i) {
  176                 struct mthca_next_seg *next;
  177 
  178                 next = wqe = get_wqe(srq, i);
  179 
  180                 if (i < srq->max - 1) {
  181                         *wqe_to_link(wqe) = i + 1;
  182                         next->nda_op = htonl(((i + 1) << srq->wqe_shift) | 1);
  183                 } else {
  184                         *wqe_to_link(wqe) = -1;
  185                         next->nda_op = 0;
  186                 }
  187 
  188                 for (scatter = wqe + sizeof (struct mthca_next_seg);
  189                      (void *) scatter < wqe + (1 << srq->wqe_shift);
  190                      ++scatter)
  191                         scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
  192         }
  193 
  194         srq->last = get_wqe(srq, srq->max - 1);
  195 
  196         return 0;
  197 }
  198 
  199 int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
  200                     struct ib_srq_attr *attr, struct mthca_srq *srq)
  201 {
  202         struct mthca_mailbox *mailbox;
  203         int ds;
  204         int err;
  205 
  206         /* Sanity check SRQ size before proceeding */
  207         if (attr->max_wr  > dev->limits.max_srq_wqes ||
  208             attr->max_sge > dev->limits.max_srq_sge)
  209                 return -EINVAL;
  210 
  211         srq->max      = attr->max_wr;
  212         srq->max_gs   = attr->max_sge;
  213         srq->counter  = 0;
  214 
  215         if (mthca_is_memfree(dev))
  216                 srq->max = roundup_pow_of_two(srq->max + 1);
  217         else
  218                 srq->max = srq->max + 1;
  219 
  220         ds = max(64UL,
  221                  roundup_pow_of_two(sizeof (struct mthca_next_seg) +
  222                                     srq->max_gs * sizeof (struct mthca_data_seg)));
  223 
  224         if (!mthca_is_memfree(dev) && (ds > dev->limits.max_desc_sz))
  225                 return -EINVAL;
  226 
  227         srq->wqe_shift = ilog2(ds);
  228 
  229         srq->srqn = mthca_alloc(&dev->srq_table.alloc);
  230         if (srq->srqn == -1)
  231                 return -ENOMEM;
  232 
  233         if (mthca_is_memfree(dev)) {
  234                 err = mthca_table_get(dev, dev->srq_table.table, srq->srqn);
  235                 if (err)
  236                         goto err_out;
  237 
  238                 if (!pd->ibpd.uobject) {
  239                         srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ,
  240                                                        srq->srqn, &srq->db);
  241                         if (srq->db_index < 0) {
  242                                 err = -ENOMEM;
  243                                 goto err_out_icm;
  244                         }
  245                 }
  246         }
  247 
  248         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  249         if (IS_ERR(mailbox)) {
  250                 err = PTR_ERR(mailbox);
  251                 goto err_out_db;
  252         }
  253 
  254         err = mthca_alloc_srq_buf(dev, pd, srq);
  255         if (err)
  256                 goto err_out_mailbox;
  257 
  258         spin_lock_init(&srq->lock);
  259         srq->refcount = 1;
  260         init_waitqueue_head(&srq->wait);
  261         mutex_init(&srq->mutex);
  262 
  263         if (mthca_is_memfree(dev))
  264                 mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
  265         else
  266                 mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf);
  267 
  268         err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn);
  269 
  270         if (err) {
  271                 mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err);
  272                 goto err_out_free_buf;
  273         }
  274 
  275         spin_lock_irq(&dev->srq_table.lock);
  276         if (mthca_array_set(&dev->srq_table.srq,
  277                             srq->srqn & (dev->limits.num_srqs - 1),
  278                             srq)) {
  279                 spin_unlock_irq(&dev->srq_table.lock);
  280                 goto err_out_free_srq;
  281         }
  282         spin_unlock_irq(&dev->srq_table.lock);
  283 
  284         mthca_free_mailbox(dev, mailbox);
  285 
  286         srq->first_free = 0;
  287         srq->last_free  = srq->max - 1;
  288 
  289         attr->max_wr    = srq->max - 1;
  290         attr->max_sge   = srq->max_gs;
  291 
  292         return 0;
  293 
  294 err_out_free_srq:
  295         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn);
  296         if (err)
  297                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
  298 
  299 err_out_free_buf:
  300         if (!pd->ibpd.uobject)
  301                 mthca_free_srq_buf(dev, srq);
  302 
  303 err_out_mailbox:
  304         mthca_free_mailbox(dev, mailbox);
  305 
  306 err_out_db:
  307         if (!pd->ibpd.uobject && mthca_is_memfree(dev))
  308                 mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
  309 
  310 err_out_icm:
  311         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
  312 
  313 err_out:
  314         mthca_free(&dev->srq_table.alloc, srq->srqn);
  315 
  316         return err;
  317 }
  318 
  319 static inline int get_srq_refcount(struct mthca_dev *dev, struct mthca_srq *srq)
  320 {
  321         int c;
  322 
  323         spin_lock_irq(&dev->srq_table.lock);
  324         c = srq->refcount;
  325         spin_unlock_irq(&dev->srq_table.lock);
  326 
  327         return c;
  328 }
  329 
  330 void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq)
  331 {
  332         struct mthca_mailbox *mailbox;
  333         int err;
  334 
  335         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  336         if (IS_ERR(mailbox)) {
  337                 mthca_warn(dev, "No memory for mailbox to free SRQ.\n");
  338                 return;
  339         }
  340 
  341         err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn);
  342         if (err)
  343                 mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err);
  344 
  345         spin_lock_irq(&dev->srq_table.lock);
  346         mthca_array_clear(&dev->srq_table.srq,
  347                           srq->srqn & (dev->limits.num_srqs - 1));
  348         --srq->refcount;
  349         spin_unlock_irq(&dev->srq_table.lock);
  350 
  351         wait_event(srq->wait, !get_srq_refcount(dev, srq));
  352 
  353         if (!srq->ibsrq.uobject) {
  354                 mthca_free_srq_buf(dev, srq);
  355                 if (mthca_is_memfree(dev))
  356                         mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
  357         }
  358 
  359         mthca_table_put(dev, dev->srq_table.table, srq->srqn);
  360         mthca_free(&dev->srq_table.alloc, srq->srqn);
  361         mthca_free_mailbox(dev, mailbox);
  362 }
  363 
  364 int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
  365                      enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
  366 {
  367         struct mthca_dev *dev = to_mdev(ibsrq->device);
  368         struct mthca_srq *srq = to_msrq(ibsrq);
  369         int ret = 0;
  370 
  371         /* We don't support resizing SRQs (yet?) */
  372         if (attr_mask & IB_SRQ_MAX_WR)
  373                 return -EINVAL;
  374 
  375         if (attr_mask & IB_SRQ_LIMIT) {
  376                 u32 max_wr = mthca_is_memfree(dev) ? srq->max - 1 : srq->max;
  377                 if (attr->srq_limit > max_wr)
  378                         return -EINVAL;
  379 
  380                 mutex_lock(&srq->mutex);
  381                 ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit);
  382                 mutex_unlock(&srq->mutex);
  383         }
  384 
  385         return ret;
  386 }
  387 
  388 int mthca_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
  389 {
  390         struct mthca_dev *dev = to_mdev(ibsrq->device);
  391         struct mthca_srq *srq = to_msrq(ibsrq);
  392         struct mthca_mailbox *mailbox;
  393         struct mthca_arbel_srq_context *arbel_ctx;
  394         struct mthca_tavor_srq_context *tavor_ctx;
  395         int err;
  396 
  397         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  398         if (IS_ERR(mailbox))
  399                 return PTR_ERR(mailbox);
  400 
  401         err = mthca_QUERY_SRQ(dev, srq->srqn, mailbox);
  402         if (err)
  403                 goto out;
  404 
  405         if (mthca_is_memfree(dev)) {
  406                 arbel_ctx = mailbox->buf;
  407                 srq_attr->srq_limit = be16_to_cpu(arbel_ctx->limit_watermark);
  408         } else {
  409                 tavor_ctx = mailbox->buf;
  410                 srq_attr->srq_limit = be16_to_cpu(tavor_ctx->limit_watermark);
  411         }
  412 
  413         srq_attr->max_wr  = srq->max - 1;
  414         srq_attr->max_sge = srq->max_gs;
  415 
  416 out:
  417         mthca_free_mailbox(dev, mailbox);
  418 
  419         return err;
  420 }
  421 
  422 void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
  423                      enum ib_event_type event_type)
  424 {
  425         struct mthca_srq *srq;
  426         struct ib_event event;
  427 
  428         spin_lock(&dev->srq_table.lock);
  429         srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
  430         if (srq)
  431                 ++srq->refcount;
  432         spin_unlock(&dev->srq_table.lock);
  433 
  434         if (!srq) {
  435                 mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
  436                 return;
  437         }
  438 
  439         if (!srq->ibsrq.event_handler)
  440                 goto out;
  441 
  442         event.device      = &dev->ib_dev;
  443         event.event       = event_type;
  444         event.element.srq = &srq->ibsrq;
  445         srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);
  446 
  447 out:
  448         spin_lock(&dev->srq_table.lock);
  449         if (!--srq->refcount)
  450                 wake_up(&srq->wait);
  451         spin_unlock(&dev->srq_table.lock);
  452 }
  453 
  454 /*
  455  * This function must be called with IRQs disabled.
  456  */
  457 void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
  458 {
  459         int ind;
  460         struct mthca_next_seg *last_free;
  461 
  462         ind = wqe_addr >> srq->wqe_shift;
  463 
  464         spin_lock(&srq->lock);
  465 
  466         last_free = get_wqe(srq, srq->last_free);
  467         *wqe_to_link(last_free) = ind;
  468         last_free->nda_op = htonl((ind << srq->wqe_shift) | 1);
  469         *wqe_to_link(get_wqe(srq, ind)) = -1;
  470         srq->last_free = ind;
  471 
  472         spin_unlock(&srq->lock);
  473 }
  474 
  475 int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
  476                               struct ib_recv_wr **bad_wr)
  477 {
  478         struct mthca_dev *dev = to_mdev(ibsrq->device);
  479         struct mthca_srq *srq = to_msrq(ibsrq);
  480         unsigned long flags;
  481         int err = 0;
  482         int first_ind;
  483         int ind;
  484         int next_ind;
  485         int nreq;
  486         int i;
  487         void *wqe;
  488         void *prev_wqe;
  489 
  490         spin_lock_irqsave(&srq->lock, flags);
  491 
  492         first_ind = srq->first_free;
  493 
  494         for (nreq = 0; wr; wr = wr->next) {
  495                 ind       = srq->first_free;
  496                 wqe       = get_wqe(srq, ind);
  497                 next_ind  = *wqe_to_link(wqe);
  498 
  499                 if (unlikely(next_ind < 0)) {
  500                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
  501                         err = -ENOMEM;
  502                         *bad_wr = wr;
  503                         break;
  504                 }
  505 
  506                 prev_wqe  = srq->last;
  507                 srq->last = wqe;
  508 
  509                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
  510                 /* flags field will always remain 0 */
  511 
  512                 wqe += sizeof (struct mthca_next_seg);
  513 
  514                 if (unlikely(wr->num_sge > srq->max_gs)) {
  515                         err = -EINVAL;
  516                         *bad_wr = wr;
  517                         srq->last = prev_wqe;
  518                         break;
  519                 }
  520 
  521                 for (i = 0; i < wr->num_sge; ++i) {
  522                         mthca_set_data_seg(wqe, wr->sg_list + i);
  523                         wqe += sizeof (struct mthca_data_seg);
  524                 }
  525 
  526                 if (i < srq->max_gs)
  527                         mthca_set_data_seg_inval(wqe);
  528 
  529                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
  530                         cpu_to_be32(MTHCA_NEXT_DBD);
  531 
  532                 srq->wrid[ind]  = wr->wr_id;
  533                 srq->first_free = next_ind;
  534 
  535                 ++nreq;
  536                 if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
  537                         nreq = 0;
  538 
  539                         /*
  540                          * Make sure that descriptors are written
  541                          * before doorbell is rung.
  542                          */
  543                         wmb();
  544 
  545                         mthca_write64(first_ind << srq->wqe_shift, srq->srqn << 8,
  546                                       dev->kar + MTHCA_RECEIVE_DOORBELL,
  547                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
  548 
  549                         first_ind = srq->first_free;
  550                 }
  551         }
  552 
  553         if (likely(nreq)) {
  554                 /*
  555                  * Make sure that descriptors are written before
  556                  * doorbell is rung.
  557                  */
  558                 wmb();
  559 
  560                 mthca_write64(first_ind << srq->wqe_shift, (srq->srqn << 8) | nreq,
  561                               dev->kar + MTHCA_RECEIVE_DOORBELL,
  562                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
  563         }
  564 
  565         /*
  566          * Make sure doorbells don't leak out of SRQ spinlock and
  567          * reach the HCA out of order:
  568          */
  569         mmiowb();
  570 
  571         spin_unlock_irqrestore(&srq->lock, flags);
  572         return err;
  573 }
  574 
  575 int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
  576                               struct ib_recv_wr **bad_wr)
  577 {
  578         struct mthca_dev *dev = to_mdev(ibsrq->device);
  579         struct mthca_srq *srq = to_msrq(ibsrq);
  580         unsigned long flags;
  581         int err = 0;
  582         int ind;
  583         int next_ind;
  584         int nreq;
  585         int i;
  586         void *wqe;
  587 
  588         spin_lock_irqsave(&srq->lock, flags);
  589 
  590         for (nreq = 0; wr; ++nreq, wr = wr->next) {
  591                 ind       = srq->first_free;
  592                 wqe       = get_wqe(srq, ind);
  593                 next_ind  = *wqe_to_link(wqe);
  594 
  595                 if (unlikely(next_ind < 0)) {
  596                         mthca_err(dev, "SRQ %06x full\n", srq->srqn);
  597                         err = -ENOMEM;
  598                         *bad_wr = wr;
  599                         break;
  600                 }
  601 
  602                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
  603                 /* flags field will always remain 0 */
  604 
  605                 wqe += sizeof (struct mthca_next_seg);
  606 
  607                 if (unlikely(wr->num_sge > srq->max_gs)) {
  608                         err = -EINVAL;
  609                         *bad_wr = wr;
  610                         break;
  611                 }
  612 
  613                 for (i = 0; i < wr->num_sge; ++i) {
  614                         mthca_set_data_seg(wqe, wr->sg_list + i);
  615                         wqe += sizeof (struct mthca_data_seg);
  616                 }
  617 
  618                 if (i < srq->max_gs)
  619                         mthca_set_data_seg_inval(wqe);
  620 
  621                 srq->wrid[ind]  = wr->wr_id;
  622                 srq->first_free = next_ind;
  623         }
  624 
  625         if (likely(nreq)) {
  626                 srq->counter += nreq;
  627 
  628                 /*
  629                  * Make sure that descriptors are written before
  630                  * we write doorbell record.
  631                  */
  632                 wmb();
  633                 *srq->db = cpu_to_be32(srq->counter);
  634         }
  635 
  636         spin_unlock_irqrestore(&srq->lock, flags);
  637         return err;
  638 }
  639 
  640 int mthca_max_srq_sge(struct mthca_dev *dev)
  641 {
  642         if (mthca_is_memfree(dev))
  643                 return dev->limits.max_sg;
  644 
  645         /*
  646          * SRQ allocations are based on powers of 2 for Tavor,
  647          * (although they only need to be multiples of 16 bytes).
  648          *
  649          * Therefore, we need to base the max number of sg entries on
  650          * the largest power of 2 descriptor size that is <= to the
  651          * actual max WQE descriptor size, rather than return the
  652          * max_sg value given by the firmware (which is based on WQE
  653          * sizes as multiples of 16, not powers of 2).
  654          *
  655          * If SRQ implementation is changed for Tavor to be based on
  656          * multiples of 16, the calculation below can be deleted and
  657          * the FW max_sg value returned.
  658          */
  659         return min_t(int, dev->limits.max_sg,
  660                      ((1 << (fls(dev->limits.max_desc_sz) - 1)) -
  661                       sizeof (struct mthca_next_seg)) /
  662                      sizeof (struct mthca_data_seg));
  663 }
  664 
  665 int mthca_init_srq_table(struct mthca_dev *dev)
  666 {
  667         int err;
  668 
  669         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
  670                 return 0;
  671 
  672         spin_lock_init(&dev->srq_table.lock);
  673 
  674         err = mthca_alloc_init(&dev->srq_table.alloc,
  675                                dev->limits.num_srqs,
  676                                dev->limits.num_srqs - 1,
  677                                dev->limits.reserved_srqs);
  678         if (err)
  679                 return err;
  680 
  681         err = mthca_array_init(&dev->srq_table.srq,
  682                                dev->limits.num_srqs);
  683         if (err)
  684                 mthca_alloc_cleanup(&dev->srq_table.alloc);
  685 
  686         return err;
  687 }
  688 
  689 void mthca_cleanup_srq_table(struct mthca_dev *dev)
  690 {
  691         if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
  692                 return;
  693 
  694         mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
  695         mthca_alloc_cleanup(&dev->srq_table.alloc);
  696 }
Cache object: 62f0e1fceb796a8d2230e2c48dee315f
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/dev/mthca/mthca_srq.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mthca/mthca_srq.c
