From 8d336ba9cbcb4832b992201497afe07afcd4f2e1 Mon Sep 17 00:00:00 2001
From: John Daley <johndale@cisco.com>
Date: Fri, 1 Jul 2016 12:32:45 -0700
Subject: [PATCH 19/25] enic: fix Rx queue initialization after restarting a
device
If you stop then start a port that had already received some packets,
the NIC could fetch discriptors from the wrong location. This could
effectivly reduce the size of the Rx queue by a random amount and
cause packet drop or reduced performance.
Reset the NIC fetch index to 0 when allocating and posting mbuf
addresses to the NIC.
Fixes: 947d860c821f ("enic: improve Rx performance")
Signed-off-by: John Daley <johndale@cisco.com>
Reviewed-by: Nelson Escobar <neescoba@cisco.com>
---
drivers/net/enic/enic_main.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index be17707..68532d3 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -346,6 +346,7 @@ enic_alloc_rx_queue_mbufs(struct enic *enic, struct vnic_rq *rq)
dev_debug(enic, "port=%u, qidx=%u, Write %u posted idx, %u sw held\n",
enic->port_id, rq->index, rq->posted_index, rq->rx_nb_hold);
iowrite32(rq->posted_index, &rq->ctrl->posted_index);
+ iowrite32(0, &rq->ctrl->fetch_index);
rte_rmb();
// printf("posted %d buffers to %s rq\n", rq->ring.desc_count,
--
2.7.0