drivers/staging/rdma/amso1100/c2_cq.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   6  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   7  * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
   8  *
   9  * This software is available to you under a choice of one of two
  10  * licenses.  You may choose to be licensed under the terms of the GNU
  11  * General Public License (GPL) Version 2, available from the file
  12  * COPYING in the main directory of this source tree, or the
  13  * OpenIB.org BSD license below:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  23  *      - Redistributions in binary form must reproduce the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer in the documentation and/or other materials
  26  *        provided with the distribution.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  35  * SOFTWARE.
  36  *
  37  */
  38 #include <linux/gfp.h>
  39
  40 #include "c2.h"
  41 #include "c2_vq.h"
  42 #include "c2_status.h"
  43
  44 #define C2_CQ_MSG_SIZE ((sizeof(struct c2wr_ce) + 32-1) & ~(32-1))
  45
  46 static struct c2_cq *c2_cq_get(struct c2_dev *c2dev, int cqn)
  47 {
  48         struct c2_cq *cq;
  49         unsigned long flags;
  50
  51         spin_lock_irqsave(&c2dev->lock, flags);
  52         cq = c2dev->qptr_array[cqn];
  53         if (!cq) {
  54                 spin_unlock_irqrestore(&c2dev->lock, flags);
  55                 return NULL;
  56         }
  57         atomic_inc(&cq->refcount);
  58         spin_unlock_irqrestore(&c2dev->lock, flags);
  59         return cq;
  60 }
  61
  62 static void c2_cq_put(struct c2_cq *cq)
  63 {
  64         if (atomic_dec_and_test(&cq->refcount))
  65                 wake_up(&cq->wait);
  66 }
  67
  68 void c2_cq_event(struct c2_dev *c2dev, u32 mq_index)
  69 {
  70         struct c2_cq *cq;
  71
  72         cq = c2_cq_get(c2dev, mq_index);
  73         if (!cq) {
  74                 printk("discarding events on destroyed CQN=%d\n", mq_index);
  75                 return;
  76         }
  77
  78         (*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
  79         c2_cq_put(cq);
  80 }
  81
  82 void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index)
  83 {
  84         struct c2_cq *cq;
  85         struct c2_mq *q;
  86
  87         cq = c2_cq_get(c2dev, mq_index);
  88         if (!cq)
  89                 return;
  90
  91         spin_lock_irq(&cq->lock);
  92         q = &cq->mq;
  93         if (q && !c2_mq_empty(q)) {
  94                 u16 priv = q->priv;
  95                 struct c2wr_ce *msg;
  96
  97                 while (priv != be16_to_cpu(*q->shared)) {
  98                         msg = (struct c2wr_ce *)
  99                                 (q->msg_pool.host + priv * q->msg_size);
 100                         if (msg->qp_user_context == (u64) (unsigned long) qp) {
 101                                 msg->qp_user_context = (u64) 0;
 102                         }
 103                         priv = (priv + 1) % q->q_size;
 104                 }
 105         }
 106         spin_unlock_irq(&cq->lock);
 107         c2_cq_put(cq);
 108 }
 109
 110 static inline enum ib_wc_status c2_cqe_status_to_openib(u8 status)
 111 {
 112         switch (status) {
 113         case C2_OK:
 114                 return IB_WC_SUCCESS;
 115         case CCERR_FLUSHED:
 116                 return IB_WC_WR_FLUSH_ERR;
 117         case CCERR_BASE_AND_BOUNDS_VIOLATION:
 118                 return IB_WC_LOC_PROT_ERR;
 119         case CCERR_ACCESS_VIOLATION:
 120                 return IB_WC_LOC_ACCESS_ERR;
 121         case CCERR_TOTAL_LENGTH_TOO_BIG:
 122                 return IB_WC_LOC_LEN_ERR;
 123         case CCERR_INVALID_WINDOW:
 124                 return IB_WC_MW_BIND_ERR;
 125         default:
 126                 return IB_WC_GENERAL_ERR;
 127         }
 128 }
 129
 130
 131 static inline int c2_poll_one(struct c2_dev *c2dev,
 132                               struct c2_cq *cq, struct ib_wc *entry)
 133 {
 134         struct c2wr_ce *ce;
 135         struct c2_qp *qp;
 136         int is_recv = 0;
 137
 138         ce = c2_mq_consume(&cq->mq);
 139         if (!ce) {
 140                 return -EAGAIN;
 141         }
 142
 143         /*
 144          * if the qp returned is null then this qp has already
 145          * been freed and we are unable process the completion.
 146          * try pulling the next message
 147          */
 148         while ((qp =
 149                 (struct c2_qp *) (unsigned long) ce->qp_user_context) == NULL) {
 150                 c2_mq_free(&cq->mq);
 151                 ce = c2_mq_consume(&cq->mq);
 152                 if (!ce)
 153                         return -EAGAIN;
 154         }
 155
 156         entry->status = c2_cqe_status_to_openib(c2_wr_get_result(ce));
 157         entry->wr_id = ce->hdr.context;
 158         entry->qp = &qp->ibqp;
 159         entry->wc_flags = 0;
 160         entry->slid = 0;
 161         entry->sl = 0;
 162         entry->src_qp = 0;
 163         entry->dlid_path_bits = 0;
 164         entry->pkey_index = 0;
 165
 166         switch (c2_wr_get_id(ce)) {
 167         case C2_WR_TYPE_SEND:
 168                 entry->opcode = IB_WC_SEND;
 169                 break;
 170         case C2_WR_TYPE_RDMA_WRITE:
 171                 entry->opcode = IB_WC_RDMA_WRITE;
 172                 break;
 173         case C2_WR_TYPE_RDMA_READ:
 174                 entry->opcode = IB_WC_RDMA_READ;
 175                 break;
 176         case C2_WR_TYPE_BIND_MW:
 177                 entry->opcode = IB_WC_BIND_MW;
 178                 break;
 179         case C2_WR_TYPE_RECV:
 180                 entry->byte_len = be32_to_cpu(ce->bytes_rcvd);
 181                 entry->opcode = IB_WC_RECV;
 182                 is_recv = 1;
 183                 break;
 184         default:
 185                 break;
 186         }
 187
 188         /* consume the WQEs */
 189         if (is_recv)
 190                 c2_mq_lconsume(&qp->rq_mq, 1);
 191         else
 192                 c2_mq_lconsume(&qp->sq_mq,
 193                                be32_to_cpu(c2_wr_get_wqe_count(ce)) + 1);
 194
 195         /* free the message */
 196         c2_mq_free(&cq->mq);
 197
 198         return 0;
 199 }
 200
 201 int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
 202 {
 203         struct c2_dev *c2dev = to_c2dev(ibcq->device);
 204         struct c2_cq *cq = to_c2cq(ibcq);
 205         unsigned long flags;
 206         int npolled, err;
 207
 208         spin_lock_irqsave(&cq->lock, flags);
 209
 210         for (npolled = 0; npolled < num_entries; ++npolled) {
 211
 212                 err = c2_poll_one(c2dev, cq, entry + npolled);
 213                 if (err)
 214                         break;
 215         }
 216
 217         spin_unlock_irqrestore(&cq->lock, flags);
 218
 219         return npolled;
 220 }
 221
 222 int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
 223 {
 224         struct c2_mq_shared __iomem *shared;
 225         struct c2_cq *cq;
 226         unsigned long flags;
 227         int ret = 0;
 228
 229         cq = to_c2cq(ibcq);
 230         shared = cq->mq.peer;
 231
 232         if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_NEXT_COMP)
 233                 writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type);
 234         else if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
 235                 writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type);
 236         else
 237                 return -EINVAL;
 238
 239         writeb(CQ_WAIT_FOR_DMA | CQ_ARMED, &shared->armed);
 240
 241         /*
 242          * Now read back shared->armed to make the PCI
 243          * write synchronous.  This is necessary for
 244          * correct cq notification semantics.
 245          */
 246         readb(&shared->armed);
 247
 248         if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
 249                 spin_lock_irqsave(&cq->lock, flags);
 250                 ret = !c2_mq_empty(&cq->mq);
 251                 spin_unlock_irqrestore(&cq->lock, flags);
 252         }
 253
 254         return ret;
 255 }
 256
 257 static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
 258 {
 259         dma_free_coherent(&c2dev->pcidev->dev, mq->q_size * mq->msg_size,
 260                           mq->msg_pool.host, dma_unmap_addr(mq, mapping));
 261 }
 262
 263 static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq,
 264                            size_t q_size, size_t msg_size)
 265 {
 266         u8 *pool_start;
 267
 268         if (q_size > SIZE_MAX / msg_size)
 269                 return -EINVAL;
 270
 271         pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
 272                                         &mq->host_dma, GFP_KERNEL);
 273         if (!pool_start)
 274                 return -ENOMEM;
 275
 276         c2_mq_rep_init(mq,
 277                        0,               /* index (currently unknown) */
 278                        q_size,
 279                        msg_size,
 280                        pool_start,
 281                        NULL,    /* peer (currently unknown) */
 282                        C2_MQ_HOST_TARGET);
 283
 284         dma_unmap_addr_set(mq, mapping, mq->host_dma);
 285
 286         return 0;
 287 }
 288
 289 int c2_init_cq(struct c2_dev *c2dev, int entries,
 290                struct c2_ucontext *ctx, struct c2_cq *cq)
 291 {
 292         struct c2wr_cq_create_req wr;
 293         struct c2wr_cq_create_rep *reply;
 294         unsigned long peer_pa;
 295         struct c2_vq_req *vq_req;
 296         int err;
 297
 298         might_sleep();
 299
 300         cq->ibcq.cqe = entries - 1;
 301         cq->is_kernel = !ctx;
 302
 303         /* Allocate a shared pointer */
 304         cq->mq.shared = c2_alloc_mqsp(c2dev, c2dev->kern_mqsp_pool,
 305                                       &cq->mq.shared_dma, GFP_KERNEL);
 306         if (!cq->mq.shared)
 307                 return -ENOMEM;
 308
 309         /* Allocate pages for the message pool */
 310         err = c2_alloc_cq_buf(c2dev, &cq->mq, entries + 1, C2_CQ_MSG_SIZE);
 311         if (err)
 312                 goto bail0;
 313
 314         vq_req = vq_req_alloc(c2dev);
 315         if (!vq_req) {
 316                 err = -ENOMEM;
 317                 goto bail1;
 318         }
 319
 320         memset(&wr, 0, sizeof(wr));
 321         c2_wr_set_id(&wr, CCWR_CQ_CREATE);
 322         wr.hdr.context = (unsigned long) vq_req;
 323         wr.rnic_handle = c2dev->adapter_handle;
 324         wr.msg_size = cpu_to_be32(cq->mq.msg_size);
 325         wr.depth = cpu_to_be32(cq->mq.q_size);
 326         wr.shared_ht = cpu_to_be64(cq->mq.shared_dma);
 327         wr.msg_pool = cpu_to_be64(cq->mq.host_dma);
 328         wr.user_context = (u64) (unsigned long) (cq);
 329
 330         vq_req_get(c2dev, vq_req);
 331
 332         err = vq_send_wr(c2dev, (union c2wr *) & wr);
 333         if (err) {
 334                 vq_req_put(c2dev, vq_req);
 335                 goto bail2;
 336         }
 337
 338         err = vq_wait_for_reply(c2dev, vq_req);
 339         if (err)
 340                 goto bail2;
 341
 342         reply = (struct c2wr_cq_create_rep *) (unsigned long) (vq_req->reply_msg);
 343         if (!reply) {
 344                 err = -ENOMEM;
 345                 goto bail2;
 346         }
 347
 348         if ((err = c2_errno(reply)) != 0)
 349                 goto bail3;
 350
 351         cq->adapter_handle = reply->cq_handle;
 352         cq->mq.index = be32_to_cpu(reply->mq_index);
 353
 354         peer_pa = c2dev->pa + be32_to_cpu(reply->adapter_shared);
 355         cq->mq.peer = ioremap_nocache(peer_pa, PAGE_SIZE);
 356         if (!cq->mq.peer) {
 357                 err = -ENOMEM;
 358                 goto bail3;
 359         }
 360
 361         vq_repbuf_free(c2dev, reply);
 362         vq_req_free(c2dev, vq_req);
 363
 364         spin_lock_init(&cq->lock);
 365         atomic_set(&cq->refcount, 1);
 366         init_waitqueue_head(&cq->wait);
 367
 368         /*
 369          * Use the MQ index allocated by the adapter to
 370          * store the CQ in the qptr_array
 371          */
 372         cq->cqn = cq->mq.index;
 373         c2dev->qptr_array[cq->cqn] = cq;
 374
 375         return 0;
 376
 377 bail3:
 378         vq_repbuf_free(c2dev, reply);
 379 bail2:
 380         vq_req_free(c2dev, vq_req);
 381 bail1:
 382         c2_free_cq_buf(c2dev, &cq->mq);
 383 bail0:
 384         c2_free_mqsp(cq->mq.shared);
 385
 386         return err;
 387 }
 388
 389 void c2_free_cq(struct c2_dev *c2dev, struct c2_cq *cq)
 390 {
 391         int err;
 392         struct c2_vq_req *vq_req;
 393         struct c2wr_cq_destroy_req wr;
 394         struct c2wr_cq_destroy_rep *reply;
 395
 396         might_sleep();
 397
 398         /* Clear CQ from the qptr array */
 399         spin_lock_irq(&c2dev->lock);
 400         c2dev->qptr_array[cq->mq.index] = NULL;
 401         atomic_dec(&cq->refcount);
 402         spin_unlock_irq(&c2dev->lock);
 403
 404         wait_event(cq->wait, !atomic_read(&cq->refcount));
 405
 406         vq_req = vq_req_alloc(c2dev);
 407         if (!vq_req) {
 408                 goto bail0;
 409         }
 410
 411         memset(&wr, 0, sizeof(wr));
 412         c2_wr_set_id(&wr, CCWR_CQ_DESTROY);
 413         wr.hdr.context = (unsigned long) vq_req;
 414         wr.rnic_handle = c2dev->adapter_handle;
 415         wr.cq_handle = cq->adapter_handle;
 416
 417         vq_req_get(c2dev, vq_req);
 418
 419         err = vq_send_wr(c2dev, (union c2wr *) & wr);
 420         if (err) {
 421                 vq_req_put(c2dev, vq_req);
 422                 goto bail1;
 423         }
 424
 425         err = vq_wait_for_reply(c2dev, vq_req);
 426         if (err)
 427                 goto bail1;
 428
 429         reply = (struct c2wr_cq_destroy_rep *) (unsigned long) (vq_req->reply_msg);
 430         if (reply)
 431                 vq_repbuf_free(c2dev, reply);
 432 bail1:
 433         vq_req_free(c2dev, vq_req);
 434 bail0:
 435         if (cq->is_kernel) {
 436                 c2_free_cq_buf(c2dev, &cq->mq);
 437         }
 438
 439         return;
 440 }