dpdk/dpdk-2.2.0_patches/0020-enic-fix-Rx-descriptor-limit.patch

From ce6badc60736f5e78a295f30fe84c3e40ad0c330 Mon Sep 17 00:00:00 2001
From: Nelson Escobar <neescoba@cisco.com>
Date: Fri, 18 Mar 2016 11:33:34 -0700
Subject: [PATCH 20/22]     enic: fix Rx descriptor limit

    On initialization, the rq descriptor count was set to the limit
    of the vic.  When the requested number of rx descriptors was
    less than this count, enic_alloc_rq() was incorrectly setting
    the count to the lower value.  This results in later calls to
    enic_alloc_rq() incorrectly using the lower value as the adapter
    limit.

    Fixes: fefed3d1e62c ("enic: new driver")

    Signed-off-by: Nelson Escobar <neescoba@cisco.com>
    Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic_main.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index e30672c..2f79cf0 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -524,24 +524,22 @@ int enic_alloc_rq(struct enic *enic, uint16_t queue_idx,
 				"policy.  Applying the value in the adapter "\
 				"policy (%d).\n",
 				queue_idx, nb_desc, enic->config.rq_desc_count);
-		} else if (nb_desc != enic->config.rq_desc_count) {
-			enic->config.rq_desc_count = nb_desc;
-			dev_info(enic,
-				"RX Queues - effective number of descs:%d\n",
-				nb_desc);
+			nb_desc = enic->config.rq_desc_count;
 		}
+		dev_info(enic, "RX Queues - effective number of descs:%d\n",
+			 nb_desc);
 	}
 
 	/* Allocate queue resources */
 	rc = vnic_rq_alloc(enic->vdev, rq, queue_idx,
-		enic->config.rq_desc_count, sizeof(struct rq_enet_desc));
+		nb_desc, sizeof(struct rq_enet_desc));
 	if (rc) {
 		dev_err(enic, "error in allocation of rq\n");
 		goto err_exit;
 	}
 
 	rc = vnic_cq_alloc(enic->vdev, &enic->cq[queue_idx], queue_idx,
-		socket_id, enic->config.rq_desc_count,
+		socket_id, nb_desc,
 		sizeof(struct cq_enet_rq_desc));
 	if (rc) {
 		dev_err(enic, "error in allocation of cq for rq\n");
@@ -550,7 +548,7 @@ int enic_alloc_rq(struct enic *enic, uint16_t queue_idx,
 
 	/* Allocate the mbuf ring */
 	rq->mbuf_ring = (struct rte_mbuf **)rte_zmalloc_socket("rq->mbuf_ring",
-			sizeof(struct rte_mbuf *) * enic->config.rq_desc_count,
+			sizeof(struct rte_mbuf *) * nb_desc,
 			RTE_CACHE_LINE_SIZE, rq->socket_id);
 
 	if (rq->mbuf_ring != NULL)
-- 
1.9.1