netdev - [PATCH net-next v1 2/3] bnxt_en: stop packet flow during bnxt_queue

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Message-ID: <20240729205459.2583533-3-dw@davidwei.uk>
Date: Mon, 29 Jul 2024 13:54:58 -0700
From: David Wei <dw@...idwei.uk>
To: netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Michael Chan <michael.chan@...adcom.com>
Subject: [PATCH net-next v1 2/3] bnxt_en: stop packet flow during bnxt_queue_stop/start

Calling napi_stop/start during bnxt_queue_stop/start isn't enough. The
current implementation when resetting a queue while packets are flowing
puts the queue into an inconsistent state.

There needs to be some synchronisation with the FW. Add calls to
bnxt_hwrm_vnic_update() to set the MRU for both the default and ntuple
vnic during queue start/stop. When the MRU is set to 0, flow is stopped.
Each Rx queue belongs to either the default or the ntuple vnic.

Co-Developed-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 8822d7a17fbf..ce60c9322fe6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -15172,7 +15172,8 @@ static int bnxt_queue_start(struct net_device *dev, void *qmem, int idx)
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_rx_ring_info *rxr, *clone;
 	struct bnxt_cp_ring_info *cpr;
-	int rc;
+	struct bnxt_vnic_info *vnic;
+	int i, rc;
 
 	rxr = &bp->rx_ring[idx];
 	clone = qmem;
@@ -15197,11 +15198,16 @@ static int bnxt_queue_start(struct net_device *dev, void *qmem, int idx)
 	if (bp->flags & BNXT_FLAG_AGG_RINGS)
 		bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
 
-	napi_enable(&rxr->bnapi->napi);
-
 	cpr = &rxr->bnapi->cp_ring;
 	cpr->sw_stats->rx.rx_resets++;
 
+	for (i = 0; i <= BNXT_VNIC_NTUPLE; i++) {
+		vnic = &bp->vnic_info[i];
+		vnic->mru = bp->dev->mtu + ETH_HLEN + VLAN_HLEN;
+		bnxt_hwrm_vnic_update(bp, vnic,
+				      VNIC_UPDATE_REQ_ENABLES_MRU_VALID);
+	}
+
 	return 0;
 
 err_free_hwrm_rx_ring:
@@ -15213,9 +15219,17 @@ static int bnxt_queue_stop(struct net_device *dev, void *qmem, int idx)
 {
 	struct bnxt *bp = netdev_priv(dev);
 	struct bnxt_rx_ring_info *rxr;
+	struct bnxt_vnic_info *vnic;
+	int i;
+
+	for (i = 0; i <= BNXT_VNIC_NTUPLE; i++) {
+		vnic = &bp->vnic_info[i];
+		vnic->mru = 0;
+		bnxt_hwrm_vnic_update(bp, vnic,
+				      VNIC_UPDATE_REQ_ENABLES_MRU_VALID);
+	}
 
 	rxr = &bp->rx_ring[idx];
-	napi_disable(&rxr->bnapi->napi);
 	bnxt_hwrm_rx_ring_free(bp, rxr, false);
 	bnxt_hwrm_rx_agg_ring_free(bp, rxr, false);
 	rxr->rx_next_cons = 0;
-- 
2.43.0