[rdma-core 2/4] libqedr: fail post_send on WR overflow

[Ram Amrani <Ram.Amrani-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>]

Post send will fail if it is full, thus preventing an overflow.
Signed-off-by: Ram Amrani <Ram.Amrani-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
---
 providers/qedr/qelr_verbs.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/providers/qedr/qelr_verbs.c b/providers/qedr/qelr_verbs.c
index 8d94a12..7419540 100644
--- a/providers/qedr/qelr_verbs.c
+++ b/providers/qedr/qelr_verbs.c
@@ -70,6 +70,11 @@ static void qelr_inc_sw_prod_u16(struct qelr_qp_hwq_info *info)
 	info->prod = (info->prod + 1) % info->max_wr;
 }
 
+static inline int qelr_wq_is_full(struct qelr_qp_hwq_info *info)
+{
+	return (((info->prod + 1) % info->max_wr) == info->cons);
+}
+
 int qelr_query_device(struct ibv_context *context,
 		      struct ibv_device_attr *attr)
 {
@@ -1144,6 +1149,14 @@ static inline int qelr_can_post_send(struct qelr_devctx *cxt,
 		return -EINVAL;
 	}
 
+	/* WR overflow */
+	if (qelr_wq_is_full(&qp->sq)) {
+		DP_ERR(cxt->dbg_fp,
+		       "error: WQ is full. Post send on QP %p failed (this error appears only once)\n",
+		       qp);
+		return -ENOMEM;
+	}
+
 	/* WQE overflow */
 	if (qelr_chain_get_elem_left_u32(&qp->sq.chain) <
 			QELR_MAX_SQ_WQE_SIZE) {
-- 
1.8.3.1

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