[dpdk-dev] [PATCH] net/bnxt: update ring group after ring stop start

[Ajit Khaparde]

A Rx ring stop start sequence may result in the FW returning
a different set of Rx ring and AGG ring IDs. If the ring group
is not updated with the new IDs, the HW sees the host driver using
incorrect BD types for the Rx ring and AGG ring. This can cause
the chip to go into a bad state or encounter RE_flush issue
or leak MBUFs in the HW.

Fix this by issuing a bnxt_hwrm_ring_grp_free() and an
bnxt_hwrm_ring_grp_alloc() to refresh the ring group information.

Fixes: 9b63c6fd70e3 ("net/bnxt: support Rx/Tx queue start/stop")
Cc: stable at dpdk.org

Signed-off-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
---
 drivers/net/bnxt/bnxt_hwrm.c | 3 +++
 drivers/net/bnxt/bnxt_ring.c | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index 73deb41f81..eb9de45cb9 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -2717,6 +2717,9 @@ void bnxt_free_hwrm_rx_ring(struct bnxt *bp, int queue_index)
 	struct bnxt_ring *ring = rxr->rx_ring_struct;
 	struct bnxt_cp_ring_info *cpr = rxq->cp_ring;
 
+	if (BNXT_HAS_RING_GRPS(bp))
+		bnxt_hwrm_ring_grp_free(bp, queue_index);
+
 	bnxt_hwrm_ring_free(bp, ring,
 			    HWRM_RING_FREE_INPUT_RING_TYPE_RX,
 			    cpr->cp_ring_struct->fw_ring_id);
diff --git a/drivers/net/bnxt/bnxt_ring.c b/drivers/net/bnxt/bnxt_ring.c
index b05c470766..957b175f1b 100644
--- a/drivers/net/bnxt/bnxt_ring.c
+++ b/drivers/net/bnxt/bnxt_ring.c
@@ -631,6 +631,12 @@ int bnxt_alloc_hwrm_rx_ring(struct bnxt *bp, int queue_index)
 	if (rc)
 		goto err_out;
 
+	if (BNXT_HAS_RING_GRPS(bp)) {
+		rc = bnxt_hwrm_ring_grp_alloc(bp, queue_index);
+		if (rc)
+			goto err_out;
+	}
+
 	if (rxq->rx_started) {
 		if (bnxt_init_one_rx_ring(rxq)) {
 			PMD_DRV_LOG(ERR, "bnxt_init_one_rx_ring failed!\n");
-- 
2.21.1 (Apple Git-122.3)