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[dpdk-dev,2/2] enic: fix Rx queue initialization after restarting a device

Message ID 1467241401-26210-2-git-send-email-johndale@cisco.com (mailing list archive)
State Accepted, archived
Delegated to: Bruce Richardson
Headers show

Commit Message

John Daley June 29, 2016, 11:03 p.m. UTC
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(+)
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diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index dc831b4..0475cc1 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -334,6 +334,7 @@  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);
 	return 0;