netdev - [net] octeontx2-af: Fix pause frame configuration

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Date: Fri, 8 Dec 2023 14:57:54 +0530
From: Hariprasad Kelam <hkelam@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <kuba@...nel.org>, <davem@...emloft.net>, <sgoutham@...vell.com>,
        <gakula@...vell.com>, <jerinj@...vell.com>, <lcherian@...vell.com>,
        <sbhatta@...vell.com>, <hkelam@...vell.com>, <naveenm@...vell.com>,
        <edumazet@...gle.com>, <pabeni@...hat.com>
Subject: [net] octeontx2-af: Fix pause frame configuration

The current implementation's default Pause Forward setting is causing
unnecessary network traffic. This patch disables Pause Forward to
address this issue.

Fixes: 1121f6b02e7a ("octeontx2-af: Priority flow control configuration support")
Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/rpm.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rpm.c b/drivers/net/ethernet/marvell/octeontx2/af/rpm.c
index af21e2030cff..4728ba34b0e3 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rpm.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rpm.c
@@ -373,6 +373,11 @@ void rpm_lmac_pause_frm_config(void *rpmd, int lmac_id, bool enable)
 	cfg |= RPMX_MTI_MAC100X_COMMAND_CONFIG_TX_P_DISABLE;
 	rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
 
+	/* Disable forward pause to driver */
+	cfg = rpm_read(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG);
+	cfg &= ~RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_FWD;
+	rpm_write(rpm, lmac_id, RPMX_MTI_MAC100X_COMMAND_CONFIG, cfg);
+
 	/* Enable channel mask for all LMACS */
 	if (is_dev_rpm2(rpm))
 		rpm_write(rpm, lmac_id, RPM2_CMR_CHAN_MSK_OR, 0xffff);
@@ -616,12 +621,10 @@ int rpm_lmac_pfc_config(void *rpmd, int lmac_id, u8 tx_pause, u8 rx_pause, u16 p
 
 	if (rx_pause) {
 		cfg &= ~(RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE |
-				RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE |
-				RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_FWD);
+			 RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE);
 	} else {
 		cfg |= (RPMX_MTI_MAC100X_COMMAND_CONFIG_RX_P_DISABLE |
-				RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE |
-				RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_FWD);
+			RPMX_MTI_MAC100X_COMMAND_CONFIG_PAUSE_IGNORE);
 	}
 
 	if (tx_pause) {
-- 
2.17.1