linux-kernel - [PATCH net-next] net: ethernet: ti: cpsw: don't flush mcast entries while switch promisc mode

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Date:   Thu, 18 Oct 2018 21:00:06 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     grygorii.strashko@...com, davem@...emloft.net
Cc:     linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: [PATCH net-next] net: ethernet: ti: cpsw: don't flush mcast entries while switch promisc mode

No need now to flush mcast entries in switch mode while toggling to
promiscuous mode. It's not needed as vlan reg_mcast = ALL_PORTS
and mcast/vlan ports = ALL_PORTS, the same happening for vlan
unreg_mcast, it's set to ALL_PORT_MASK just after calling promisc
mode routine by calling set allmulti. I suppose main reason to flush
them is to use unreg_mcast to receive all to host port. Thus, now, all
mcast packets are received anyway and no reason to flush mcast entries
unsafely, as they were synced with __dev_mc_sync() previously and are
not restored. Another way is to _dev_mc_unsync() them, but no need.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
---

Based on net-next/master
Tasted on am572x EVM and BBB

 drivers/net/ethernet/ti/cpsw.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 226be2a56c1f..0e475020a674 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -638,9 +638,6 @@ static void cpsw_set_promiscious(struct net_device *ndev, bool enable)
 			} while (time_after(timeout, jiffies));
 			cpsw_ale_control_set(ale, 0, ALE_AGEOUT, 1);

-			/* Clear all mcast from ALE */
-			cpsw_ale_flush_multicast(ale, ALE_ALL_PORTS, -1);
-
 			/* Flood All Unicast Packets to Host port */
 			cpsw_ale_control_set(ale, 0, ALE_P0_UNI_FLOOD, 1);
 			dev_dbg(&ndev->dev, "promiscuity enabled\n");
-- 
2.17.1