netdev - [net PATCH V2 1/4] octeontx2-pf: Update PFC configuration

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Date: Wed, 9 Aug 2023 12:35:29 +0530
From: Suman Ghosh <sumang@...vell.com>
To: <sgoutham@...vell.com>, <gakula@...vell.com>, <sbhatta@...vell.com>,
        <hkelam@...vell.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <lcherian@...vell.com>,
        <jerinj@...vell.com>
CC: Suman Ghosh <sumang@...vell.com>
Subject: [net PATCH V2 1/4] octeontx2-pf: Update PFC configuration

As of now we are creating/deleting Tx schedulers when user is
setting PFC on/off. The problem is if we have a running traffic on
the interface and as we are updating the sq->smq mapping on the fly,
we might loose completion interrupt for some packets. As a result of
that a watchdog reset is hit from BQL.
This patch solves the issue by simply calling interface off/on APIs
which will reconfigure all the queues. We might loss the running traffic
momentarily but that should be fine.

Fixes: 99c969a83d82 ("octeontx2-pf: Add egress PFC support")
Signed-off-by: Suman Ghosh <sumang@...vell.com>
---
 .../net/ethernet/marvell/octeontx2/nic/otx2_dcbnl.c  | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_dcbnl.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_dcbnl.c
index ccaf97bb1ce0..d54edfa8fcc9 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_dcbnl.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_dcbnl.c
@@ -406,6 +406,7 @@ static int otx2_dcbnl_ieee_getpfc(struct net_device *dev, struct ieee_pfc *pfc)
 static int otx2_dcbnl_ieee_setpfc(struct net_device *dev, struct ieee_pfc *pfc)
 {
 	struct otx2_nic *pfvf = netdev_priv(dev);
+	bool if_up = netif_running(dev);
 	int err;
 
 	/* Save PFC configuration to interface */
@@ -426,14 +427,9 @@ static int otx2_dcbnl_ieee_setpfc(struct net_device *dev, struct ieee_pfc *pfc)
 	if (err)
 		return err;
 
-	/* Request Per channel Bpids */
-	if (pfc->pfc_en)
-		otx2_nix_config_bp(pfvf, true);
-
-	err = otx2_pfc_txschq_update(pfvf);
-	if (err) {
-		dev_err(pfvf->dev, "%s failed to update TX schedulers\n", __func__);
-		return err;
+	if (if_up) {
+		otx2_stop(dev);
+		otx2_open(dev);
 	}
 
 	return 0;
-- 
2.25.1