netdev - [PATCH net-next 07/11] bnxt_en: avoid link reset if speed is not changed

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Message-Id: <1601228540-20852-8-git-send-email-michael.chan@broadcom.com>
Date:   Sun, 27 Sep 2020 13:42:16 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        Edwin Peer <edwin.peer@...adcom.com>
Subject: [PATCH net-next 07/11] bnxt_en: avoid link reset if speed is not changed

From: Edwin Peer <edwin.peer@...adcom.com>

PORT_PHY_CONFIG is always sent with REQ_FLAGS_RESET_PHY set. This flag
must be set in order for the firmware to institute the requested PHY
change immediately, but it results in a link flap. This is unnecessary
and results in an improved user experience if the PHY reconfiguration
is avoided when the user requested speed does not constitute a change.

Signed-off-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 2cb2495c2351..4fdb672a47a0 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1736,6 +1736,11 @@ static int bnxt_force_link_speed(struct net_device *dev, u32 ethtool_speed)
 		return -EINVAL;
 	}
 
+	if (link_info->req_link_speed == fw_speed &&
+	    link_info->req_signal_mode == sig_mode &&
+	    link_info->autoneg == 0)
+		return -EALREADY;
+
 	link_info->req_link_speed = fw_speed;
 	link_info->req_signal_mode = sig_mode;
 	link_info->req_duplex = BNXT_LINK_DUPLEX_FULL;
@@ -1816,8 +1821,11 @@ static int bnxt_set_link_ksettings(struct net_device *dev,
 		}
 		speed = base->speed;
 		rc = bnxt_force_link_speed(dev, speed);
-		if (rc)
+		if (rc) {
+			if (rc == -EALREADY)
+				rc = 0;
 			goto set_setting_exit;
+		}
 	}
 
 	if (netif_running(dev))
-- 
2.18.1


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