| 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 |
| |