netdev - [PATCHv2 2/2] net: arc_emac: don't pass multicast packets to kernel in non-multicast mode

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Message-Id: <1479130373-28077-2-git-send-email-al.kochet@gmail.com>
Date:   Mon, 14 Nov 2016 16:32:53 +0300
From:   Alexander Kochetkov <al.kochet@...il.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, tremyfr@...il.com, peter.chen@....com,
        wxt@...k-chips.com, weiyj.lk@...il.com
Cc:     Alexander Kochetkov <al.kochet@...il.com>
Subject: [PATCHv2 2/2] net: arc_emac: don't pass multicast packets to kernel in non-multicast mode

The patch disable capturing multicast packets when multicast mode
disabled for ethernet ('ifconfig eth0 -multicast'). In that case
no multicast packet will be passed to kernel.

Signed-off-by: Alexander Kochetkov <al.kochet@...il.com>
---
Changes in v2:
Add Signed-off-by text.
Removed deleted line from patch.

 drivers/net/ethernet/arc/emac_main.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 2e4ee86..be865b4 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -460,7 +460,7 @@ static void arc_emac_set_rx_mode(struct net_device *ndev)
 		if (ndev->flags & IFF_ALLMULTI) {
 			arc_reg_set(priv, R_LAFL, ~0);
 			arc_reg_set(priv, R_LAFH, ~0);
-		} else {
+		} else if (ndev->flags & IFF_MULTICAST) {
 			struct netdev_hw_addr *ha;
 			unsigned int filter[2] = { 0, 0 };
 			int bit;
@@ -472,6 +472,9 @@ static void arc_emac_set_rx_mode(struct net_device *ndev)
 
 			arc_reg_set(priv, R_LAFL, filter[0]);
 			arc_reg_set(priv, R_LAFH, filter[1]);
+		} else {
+			arc_reg_set(priv, R_LAFL, 0);
+			arc_reg_set(priv, R_LAFH, 0);
 		}
 	}
 }
-- 
1.7.9.5