[dpdk-stable] patch 'net/bnxt: fix VNIC config on Rx queue stop' has been queued to stable release 20.11.1

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/87fc956cc92072d5e52d644fda6e352c6478cf0c

Thanks.

Luca Boccassi

---
>From 87fc956cc92072d5e52d644fda6e352c6478cf0c Mon Sep 17 00:00:00 2001
From: Samik Gupta <samik.gupta at broadcom.com>
Date: Fri, 6 Nov 2020 16:41:21 -0500
Subject: [PATCH] net/bnxt: fix VNIC config on Rx queue stop

[ upstream commit e36b1cd6b8cd20dbb323be7a01b8152cbb07afd4 ]

Reconfigure a vnic's default ring if the current default ring is stopped
by the application. It picks the lowest numbered ring that is currently
active to be the new default, and issues the hwrm_vnic_cfg command to
update the configuration. Applies to adapters that are not Thor-based.

Fixes: 9b63c6fd70e3 ("net/bnxt: support Rx/Tx queue start/stop")

Signed-off-by: Samik Gupta <samik.gupta at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
---
 drivers/net/bnxt/bnxt_rxq.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_rxq.c b/drivers/net/bnxt/bnxt_rxq.c
index e0ec342162..61196eba93 100644
--- a/drivers/net/bnxt/bnxt_rxq.c
+++ b/drivers/net/bnxt/bnxt_rxq.c
@@ -557,12 +557,12 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 		rc = bnxt_vnic_rss_configure(bp, vnic);
 	}
 
-	if (BNXT_CHIP_THOR(bp)) {
-		/* Compute current number of active receive queues. */
-		for (i = vnic->start_grp_id; i < vnic->end_grp_id; i++)
-			if (bp->rx_queues[i]->rx_started)
-				active_queue_cnt++;
+	/* Compute current number of active receive queues. */
+	for (i = vnic->start_grp_id; i < vnic->end_grp_id; i++)
+		if (bp->rx_queues[i]->rx_started)
+			active_queue_cnt++;
 
+	if (BNXT_CHIP_THOR(bp)) {
 		/*
 		 * For Thor, we need to ensure that the VNIC default receive
 		 * ring corresponds to an active receive queue. When no queue
@@ -582,6 +582,22 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 			/* Reconfigure default receive ring. */
 			bnxt_hwrm_vnic_cfg(bp, vnic);
 		}
+	} else if (active_queue_cnt) {
+		/*
+		 * If the queue being stopped is the current default queue and
+		 * there are other active queues, pick one of them as the
+		 * default and reconfigure the vnic.
+		 */
+		if (vnic->dflt_ring_grp == bp->grp_info[rx_queue_id].fw_grp_id) {
+			for (i = vnic->start_grp_id; i < vnic->end_grp_id; i++) {
+				if (bp->rx_queues[i]->rx_started) {
+					vnic->dflt_ring_grp =
+						bp->grp_info[i].fw_grp_id;
+					bnxt_hwrm_vnic_cfg(bp, vnic);
+					break;
+				}
+			}
+		}
 	}
 
 	if (rc == 0)
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:31.095283209 +0000
+++ 0040-net-bnxt-fix-VNIC-config-on-Rx-queue-stop.patch	2021-02-05 11:18:28.706689208 +0000
@@ -1 +1 @@
-From e36b1cd6b8cd20dbb323be7a01b8152cbb07afd4 Mon Sep 17 00:00:00 2001
+From 87fc956cc92072d5e52d644fda6e352c6478cf0c Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit e36b1cd6b8cd20dbb323be7a01b8152cbb07afd4 ]
+
@@ -12 +13,0 @@
-Cc: stable at dpdk.org