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c2_cq.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include "c2.h"
#include "c2_vq.h"
#include "c2_status.h"

#define C2_CQ_MSG_SIZE ((sizeof(struct c2wr_ce) + 32-1) & ~(32-1))

static struct c2_cq *c2_cq_get(struct c2_dev *c2dev, int cqn)
{
      struct c2_cq *cq;
      unsigned long flags;

      spin_lock_irqsave(&c2dev->lock, flags);
      cq = c2dev->qptr_array[cqn];
      if (!cq) {
            spin_unlock_irqrestore(&c2dev->lock, flags);
            return NULL;
      }
      atomic_inc(&cq->refcount);
      spin_unlock_irqrestore(&c2dev->lock, flags);
      return cq;
}

static void c2_cq_put(struct c2_cq *cq)
{
      if (atomic_dec_and_test(&cq->refcount))
            wake_up(&cq->wait);
}

void c2_cq_event(struct c2_dev *c2dev, u32 mq_index)
{
      struct c2_cq *cq;

      cq = c2_cq_get(c2dev, mq_index);
      if (!cq) {
            printk("discarding events on destroyed CQN=%d\n", mq_index);
            return;
      }

      (*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
      c2_cq_put(cq);
}

void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index)
{
      struct c2_cq *cq;
      struct c2_mq *q;

      cq = c2_cq_get(c2dev, mq_index);
      if (!cq)
            return;

      spin_lock_irq(&cq->lock);
      q = &cq->mq;
      if (q && !c2_mq_empty(q)) {
            u16 priv = q->priv;
            struct c2wr_ce *msg;

            while (priv != be16_to_cpu(*q->shared)) {
                  msg = (struct c2wr_ce *)
                        (q->msg_pool.host + priv * q->msg_size);
                  if (msg->qp_user_context == (u64) (unsigned long) qp) {
                        msg->qp_user_context = (u64) 0;
                  }
                  priv = (priv + 1) % q->q_size;
            }
      }
      spin_unlock_irq(&cq->lock);
      c2_cq_put(cq);
}

static inline enum ib_wc_status c2_cqe_status_to_openib(u8 status)
{
      switch (status) {
      case C2_OK:
            return IB_WC_SUCCESS;
      case CCERR_FLUSHED:
            return IB_WC_WR_FLUSH_ERR;
      case CCERR_BASE_AND_BOUNDS_VIOLATION:
            return IB_WC_LOC_PROT_ERR;
      case CCERR_ACCESS_VIOLATION:
            return IB_WC_LOC_ACCESS_ERR;
      case CCERR_TOTAL_LENGTH_TOO_BIG:
            return IB_WC_LOC_LEN_ERR;
      case CCERR_INVALID_WINDOW:
            return IB_WC_MW_BIND_ERR;
      default:
            return IB_WC_GENERAL_ERR;
      }
}


static inline int c2_poll_one(struct c2_dev *c2dev,
                        struct c2_cq *cq, struct ib_wc *entry)
{
      struct c2wr_ce *ce;
      struct c2_qp *qp;
      int is_recv = 0;

      ce = (struct c2wr_ce *) c2_mq_consume(&cq->mq);
      if (!ce) {
            return -EAGAIN;
      }

      /*
       * if the qp returned is null then this qp has already
       * been freed and we are unable process the completion.
       * try pulling the next message
       */
      while ((qp =
            (struct c2_qp *) (unsigned long) ce->qp_user_context) == NULL) {
            c2_mq_free(&cq->mq);
            ce = (struct c2wr_ce *) c2_mq_consume(&cq->mq);
            if (!ce)
                  return -EAGAIN;
      }

      entry->status = c2_cqe_status_to_openib(c2_wr_get_result(ce));
      entry->wr_id = ce->hdr.context;
      entry->qp = &qp->ibqp;
      entry->wc_flags = 0;
      entry->slid = 0;
      entry->sl = 0;
      entry->src_qp = 0;
      entry->dlid_path_bits = 0;
      entry->pkey_index = 0;

      switch (c2_wr_get_id(ce)) {
      case C2_WR_TYPE_SEND:
            entry->opcode = IB_WC_SEND;
            break;
      case C2_WR_TYPE_RDMA_WRITE:
            entry->opcode = IB_WC_RDMA_WRITE;
            break;
      case C2_WR_TYPE_RDMA_READ:
            entry->opcode = IB_WC_RDMA_READ;
            break;
      case C2_WR_TYPE_BIND_MW:
            entry->opcode = IB_WC_BIND_MW;
            break;
      case C2_WR_TYPE_RECV:
            entry->byte_len = be32_to_cpu(ce->bytes_rcvd);
            entry->opcode = IB_WC_RECV;
            is_recv = 1;
            break;
      default:
            break;
      }

      /* consume the WQEs */
      if (is_recv)
            c2_mq_lconsume(&qp->rq_mq, 1);
      else
            c2_mq_lconsume(&qp->sq_mq,
                         be32_to_cpu(c2_wr_get_wqe_count(ce)) + 1);

      /* free the message */
      c2_mq_free(&cq->mq);

      return 0;
}

int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
{
      struct c2_dev *c2dev = to_c2dev(ibcq->device);
      struct c2_cq *cq = to_c2cq(ibcq);
      unsigned long flags;
      int npolled, err;

      spin_lock_irqsave(&cq->lock, flags);

      for (npolled = 0; npolled < num_entries; ++npolled) {

            err = c2_poll_one(c2dev, cq, entry + npolled);
            if (err)
                  break;
      }

      spin_unlock_irqrestore(&cq->lock, flags);

      return npolled;
}

int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
{
      struct c2_mq_shared __iomem *shared;
      struct c2_cq *cq;
      unsigned long flags;
      int ret = 0;

      cq = to_c2cq(ibcq);
      shared = cq->mq.peer;

      if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_NEXT_COMP)
            writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type);
      else if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
            writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type);
      else
            return -EINVAL;

      writeb(CQ_WAIT_FOR_DMA | CQ_ARMED, &shared->armed);

      /*
       * Now read back shared->armed to make the PCI
       * write synchronous.  This is necessary for
       * correct cq notification semantics.
       */
      readb(&shared->armed);

      if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
            spin_lock_irqsave(&cq->lock, flags);
            ret = !c2_mq_empty(&cq->mq);
            spin_unlock_irqrestore(&cq->lock, flags);
      }

      return ret;
}

static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
{
      dma_free_coherent(&c2dev->pcidev->dev, mq->q_size * mq->msg_size,
                    mq->msg_pool.host, pci_unmap_addr(mq, mapping));
}

static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq, int q_size,
                     int msg_size)
{
      u8 *pool_start;

      pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
                              &mq->host_dma, GFP_KERNEL);
      if (!pool_start)
            return -ENOMEM;

      c2_mq_rep_init(mq,
                   0,         /* index (currently unknown) */
                   q_size,
                   msg_size,
                   pool_start,
                   NULL,      /* peer (currently unknown) */
                   C2_MQ_HOST_TARGET);

      pci_unmap_addr_set(mq, mapping, mq->host_dma);

      return 0;
}

int c2_init_cq(struct c2_dev *c2dev, int entries,
             struct c2_ucontext *ctx, struct c2_cq *cq)
{
      struct c2wr_cq_create_req wr;
      struct c2wr_cq_create_rep *reply;
      unsigned long peer_pa;
      struct c2_vq_req *vq_req;
      int err;

      might_sleep();

      cq->ibcq.cqe = entries - 1;
      cq->is_kernel = !ctx;

      /* Allocate a shared pointer */
      cq->mq.shared = c2_alloc_mqsp(c2dev, c2dev->kern_mqsp_pool,
                              &cq->mq.shared_dma, GFP_KERNEL);
      if (!cq->mq.shared)
            return -ENOMEM;

      /* Allocate pages for the message pool */
      err = c2_alloc_cq_buf(c2dev, &cq->mq, entries + 1, C2_CQ_MSG_SIZE);
      if (err)
            goto bail0;

      vq_req = vq_req_alloc(c2dev);
      if (!vq_req) {
            err = -ENOMEM;
            goto bail1;
      }

      memset(&wr, 0, sizeof(wr));
      c2_wr_set_id(&wr, CCWR_CQ_CREATE);
      wr.hdr.context = (unsigned long) vq_req;
      wr.rnic_handle = c2dev->adapter_handle;
      wr.msg_size = cpu_to_be32(cq->mq.msg_size);
      wr.depth = cpu_to_be32(cq->mq.q_size);
      wr.shared_ht = cpu_to_be64(cq->mq.shared_dma);
      wr.msg_pool = cpu_to_be64(cq->mq.host_dma);
      wr.user_context = (u64) (unsigned long) (cq);

      vq_req_get(c2dev, vq_req);

      err = vq_send_wr(c2dev, (union c2wr *) & wr);
      if (err) {
            vq_req_put(c2dev, vq_req);
            goto bail2;
      }

      err = vq_wait_for_reply(c2dev, vq_req);
      if (err)
            goto bail2;

      reply = (struct c2wr_cq_create_rep *) (unsigned long) (vq_req->reply_msg);
      if (!reply) {
            err = -ENOMEM;
            goto bail2;
      }

      if ((err = c2_errno(reply)) != 0)
            goto bail3;

      cq->adapter_handle = reply->cq_handle;
      cq->mq.index = be32_to_cpu(reply->mq_index);

      peer_pa = c2dev->pa + be32_to_cpu(reply->adapter_shared);
      cq->mq.peer = ioremap_nocache(peer_pa, PAGE_SIZE);
      if (!cq->mq.peer) {
            err = -ENOMEM;
            goto bail3;
      }

      vq_repbuf_free(c2dev, reply);
      vq_req_free(c2dev, vq_req);

      spin_lock_init(&cq->lock);
      atomic_set(&cq->refcount, 1);
      init_waitqueue_head(&cq->wait);

      /*
       * Use the MQ index allocated by the adapter to
       * store the CQ in the qptr_array
       */
      cq->cqn = cq->mq.index;
      c2dev->qptr_array[cq->cqn] = cq;

      return 0;

      bail3:
      vq_repbuf_free(c2dev, reply);
      bail2:
      vq_req_free(c2dev, vq_req);
      bail1:
      c2_free_cq_buf(c2dev, &cq->mq);
      bail0:
      c2_free_mqsp(cq->mq.shared);

      return err;
}

void c2_free_cq(struct c2_dev *c2dev, struct c2_cq *cq)
{
      int err;
      struct c2_vq_req *vq_req;
      struct c2wr_cq_destroy_req wr;
      struct c2wr_cq_destroy_rep *reply;

      might_sleep();

      /* Clear CQ from the qptr array */
      spin_lock_irq(&c2dev->lock);
      c2dev->qptr_array[cq->mq.index] = NULL;
      atomic_dec(&cq->refcount);
      spin_unlock_irq(&c2dev->lock);

      wait_event(cq->wait, !atomic_read(&cq->refcount));

      vq_req = vq_req_alloc(c2dev);
      if (!vq_req) {
            goto bail0;
      }

      memset(&wr, 0, sizeof(wr));
      c2_wr_set_id(&wr, CCWR_CQ_DESTROY);
      wr.hdr.context = (unsigned long) vq_req;
      wr.rnic_handle = c2dev->adapter_handle;
      wr.cq_handle = cq->adapter_handle;

      vq_req_get(c2dev, vq_req);

      err = vq_send_wr(c2dev, (union c2wr *) & wr);
      if (err) {
            vq_req_put(c2dev, vq_req);
            goto bail1;
      }

      err = vq_wait_for_reply(c2dev, vq_req);
      if (err)
            goto bail1;

      reply = (struct c2wr_cq_destroy_rep *) (unsigned long) (vq_req->reply_msg);

      vq_repbuf_free(c2dev, reply);
      bail1:
      vq_req_free(c2dev, vq_req);
      bail0:
      if (cq->is_kernel) {
            c2_free_cq_buf(c2dev, &cq->mq);
      }

      return;
}

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