mthca_srq.c

linux-2.6.15.6

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

	if (!srq->ibsrq.uobject) {
		mthca_free_srq_buf(dev, srq);
		if (mthca_is_memfree(dev))
			mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index);
	}

	mthca_table_put(dev, dev->srq_table.table, srq->srqn);
	mthca_free(&dev->srq_table.alloc, srq->srqn);
	mthca_free_mailbox(dev, mailbox);
}

int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
		     enum ib_srq_attr_mask attr_mask)
{	
	struct mthca_dev *dev = to_mdev(ibsrq->device);
	struct mthca_srq *srq = to_msrq(ibsrq);
	int ret;
	u8 status;

	/* We don't support resizing SRQs (yet?) */
	if (attr_mask & IB_SRQ_MAX_WR)
		return -EINVAL;

	if (attr_mask & IB_SRQ_LIMIT) {
		ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit, &status);
		if (ret)
			return ret;
		if (status)
			return -EINVAL;
	}

	return 0;
}

void mthca_srq_event(struct mthca_dev *dev, u32 srqn,
		     enum ib_event_type event_type)
{
	struct mthca_srq *srq;
	struct ib_event event;

	spin_lock(&dev->srq_table.lock);
	srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1));
	if (srq)
		atomic_inc(&srq->refcount);
	spin_unlock(&dev->srq_table.lock);

	if (!srq) {
		mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
		return;
	}

	if (!srq->ibsrq.event_handler)
		goto out;

	event.device      = &dev->ib_dev;
	event.event       = event_type;
	event.element.srq = &srq->ibsrq;
	srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context);

out:
	if (atomic_dec_and_test(&srq->refcount))
		wake_up(&srq->wait);
}

/*
 * This function must be called with IRQs disabled.
 */
void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr)
{
	int ind;

	ind = wqe_addr >> srq->wqe_shift;

	spin_lock(&srq->lock);

	if (likely(srq->first_free >= 0))
		*wqe_to_link(get_wqe(srq, srq->last_free)) = ind;
	else
		srq->first_free = ind;

	*wqe_to_link(get_wqe(srq, ind)) = -1;
	srq->last_free = ind;

	spin_unlock(&srq->lock);
}

int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
			      struct ib_recv_wr **bad_wr)
{
	struct mthca_dev *dev = to_mdev(ibsrq->device);
	struct mthca_srq *srq = to_msrq(ibsrq);
	__be32 doorbell[2];
	unsigned long flags;
	int err = 0;
	int first_ind;
	int ind;
	int next_ind;
	int nreq;
	int i;
	void *wqe;
	void *prev_wqe;

	spin_lock_irqsave(&srq->lock, flags);

	first_ind = srq->first_free;

	for (nreq = 0; wr; ++nreq, wr = wr->next) {
		if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
			nreq = 0;

			doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
			doorbell[1] = cpu_to_be32(srq->srqn << 8);

			/*
			 * Make sure that descriptors are written
			 * before doorbell is rung.
			 */
			wmb();

			mthca_write64(doorbell,
				      dev->kar + MTHCA_RECEIVE_DOORBELL,
				      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));

			first_ind = srq->first_free;
		}

		ind = srq->first_free;

		if (ind < 0) {
			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
			err = -ENOMEM;
			*bad_wr = wr;
			break;
		}

		wqe       = get_wqe(srq, ind);
		next_ind  = *wqe_to_link(wqe);

		if (next_ind < 0) {
			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
			err = -ENOMEM;
			*bad_wr = wr;
			break;
		}

		prev_wqe  = srq->last;
		srq->last = wqe;

		((struct mthca_next_seg *) wqe)->nda_op = 0;
		((struct mthca_next_seg *) wqe)->ee_nds = 0;
		/* flags field will always remain 0 */

		wqe += sizeof (struct mthca_next_seg);

		if (unlikely(wr->num_sge > srq->max_gs)) {
			err = -EINVAL;
			*bad_wr = wr;
			srq->last = prev_wqe;
			break;
		}

		for (i = 0; i < wr->num_sge; ++i) {
			((struct mthca_data_seg *) wqe)->byte_count =
				cpu_to_be32(wr->sg_list[i].length);
			((struct mthca_data_seg *) wqe)->lkey =
				cpu_to_be32(wr->sg_list[i].lkey);
			((struct mthca_data_seg *) wqe)->addr =
				cpu_to_be64(wr->sg_list[i].addr);
			wqe += sizeof (struct mthca_data_seg);
		}

		if (i < srq->max_gs) {
			((struct mthca_data_seg *) wqe)->byte_count = 0;
			((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
			((struct mthca_data_seg *) wqe)->addr = 0;
		}

		((struct mthca_next_seg *) prev_wqe)->nda_op =
			cpu_to_be32((ind << srq->wqe_shift) | 1);
		wmb();
		((struct mthca_next_seg *) prev_wqe)->ee_nds =
			cpu_to_be32(MTHCA_NEXT_DBD);

		srq->wrid[ind]  = wr->wr_id;
		srq->first_free = next_ind;
	}

	if (likely(nreq)) {
		doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
		doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq);

		/*
		 * Make sure that descriptors are written before
		 * doorbell is rung.
		 */
		wmb();

		mthca_write64(doorbell,
			      dev->kar + MTHCA_RECEIVE_DOORBELL,
			      MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
	}

	spin_unlock_irqrestore(&srq->lock, flags);
	return err;
}

int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
			      struct ib_recv_wr **bad_wr)
{
	struct mthca_dev *dev = to_mdev(ibsrq->device);
	struct mthca_srq *srq = to_msrq(ibsrq);
	unsigned long flags;
	int err = 0;
	int ind;
	int next_ind;
	int nreq;
	int i;
	void *wqe;

	spin_lock_irqsave(&srq->lock, flags);

	for (nreq = 0; wr; ++nreq, wr = wr->next) {
		ind = srq->first_free;

		if (ind < 0) {
			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
			err = -ENOMEM;
			*bad_wr = wr;
			break;
		}

		wqe       = get_wqe(srq, ind);
		next_ind  = *wqe_to_link(wqe);

		if (next_ind < 0) {
			mthca_err(dev, "SRQ %06x full\n", srq->srqn);
			err = -ENOMEM;
			*bad_wr = wr;
			break;
		}

		((struct mthca_next_seg *) wqe)->nda_op =
			cpu_to_be32((next_ind << srq->wqe_shift) | 1);
		((struct mthca_next_seg *) wqe)->ee_nds = 0;
		/* flags field will always remain 0 */

		wqe += sizeof (struct mthca_next_seg);

		if (unlikely(wr->num_sge > srq->max_gs)) {
			err = -EINVAL;
			*bad_wr = wr;
			break;
		}

		for (i = 0; i < wr->num_sge; ++i) {
			((struct mthca_data_seg *) wqe)->byte_count =
				cpu_to_be32(wr->sg_list[i].length);
			((struct mthca_data_seg *) wqe)->lkey =
				cpu_to_be32(wr->sg_list[i].lkey);
			((struct mthca_data_seg *) wqe)->addr =
				cpu_to_be64(wr->sg_list[i].addr);
			wqe += sizeof (struct mthca_data_seg);
		}

		if (i < srq->max_gs) {
			((struct mthca_data_seg *) wqe)->byte_count = 0;
			((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
			((struct mthca_data_seg *) wqe)->addr = 0;
		}

		srq->wrid[ind]  = wr->wr_id;
		srq->first_free = next_ind;
	}

	if (likely(nreq)) {
		srq->counter += nreq;

		/*
		 * Make sure that descriptors are written before
		 * we write doorbell record.
		 */
		wmb();
		*srq->db = cpu_to_be32(srq->counter);
	}

	spin_unlock_irqrestore(&srq->lock, flags);
	return err;
}

int __devinit mthca_init_srq_table(struct mthca_dev *dev)
{
	int err;

	if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
		return 0;

	spin_lock_init(&dev->srq_table.lock);

	err = mthca_alloc_init(&dev->srq_table.alloc,
			       dev->limits.num_srqs,
			       dev->limits.num_srqs - 1,
			       dev->limits.reserved_srqs);
	if (err)
		return err;

	err = mthca_array_init(&dev->srq_table.srq,
			       dev->limits.num_srqs);
	if (err)
		mthca_alloc_cleanup(&dev->srq_table.alloc);

	return err;
}

void __devexit mthca_cleanup_srq_table(struct mthca_dev *dev)
{
	if (!(dev->mthca_flags & MTHCA_FLAG_SRQ))
		return;

	mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs);
	mthca_alloc_cleanup(&dev->srq_table.alloc);
}