netdev - [PATCH v1 net-next] teaming: deliver link-local packets with the link they arrive on

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Message-Id: <20220215220517.2498751-1-jeffreyji@google.com>
Date:   Tue, 15 Feb 2022 22:05:17 +0000
From:   Jeffrey Ji <jeffreyjilinux@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Brian Vazquez <brianvv@...gle.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        Mahesh Bandewar <maheshb@...gle.com>,
        jeffreyji <jeffreyji@...gle.com>
Subject: [PATCH v1 net-next] teaming: deliver link-local packets with the link they arrive on

From: jeffreyji <jeffreyji@...gle.com>

skb is ignored if team port is disabled. We want the skb to be delivered
if it's an LLDP packet.

Issue is already fixed for bonding in commit
b89f04c61efe3b7756434d693b9203cc0cce002e

Signed-off-by: jeffreyji <jeffreyji@...gle.com>
---
 drivers/net/team/team.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 8b2adc56b92a..24d66dfbb2e1 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -734,6 +734,12 @@ static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 	port = team_port_get_rcu(skb->dev);
 	team = port->team;
 	if (!team_port_enabled(port)) {
+		if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
+			/*
+			 * link-local packets are mostly useful when stack
+			 * receives them with the link they arrive on.
+			 */
+			return RX_HANDLER_PASS;
 		/* allow exact match delivery for disabled ports */
 		res = RX_HANDLER_EXACT;
 	} else {
-- 
2.35.1.265.g69c8d7142f-goog