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From: Vladimir Oltean <vladimir.oltean@nxp.com>
To: netdev@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
	"David S. Miller" <davem@davemloft.net>
Cc: Andrew Lunn <andrew@lunn.ch>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Vladimir Oltean <olteanv@gmail.com>
Subject: [PATCH v2 net-next 6/8] net: dsa: sja1105: increase MTU to account for VLAN header on DSA ports
Date: Wed,  4 Aug 2021 16:16:20 +0300	[thread overview]
Message-ID: <20210804131622.1695024-7-vladimir.oltean@nxp.com> (raw)
In-Reply-To: <20210804131622.1695024-1-vladimir.oltean@nxp.com>

Since all packets are transmitted as VLAN-tagged over a DSA link (this
VLAN tag represents the tag_8021q header), we need to increase the MTU
of these interfaces to account for the possibility that we are already
transporting a user-visible VLAN header.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index d1d4d956cae8..fffcaef6b148 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -982,7 +982,7 @@ static int sja1105_init_l2_policing(struct sja1105_private *priv)
 	for (port = 0; port < ds->num_ports; port++) {
 		int mtu = VLAN_ETH_FRAME_LEN + ETH_FCS_LEN;
 
-		if (dsa_is_cpu_port(priv->ds, port))
+		if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
 			mtu += VLAN_HLEN;
 
 		policing[port].smax = 65535; /* Burst size in bytes */
@@ -2664,7 +2664,7 @@ static int sja1105_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
 
 	new_mtu += VLAN_ETH_HLEN + ETH_FCS_LEN;
 
-	if (dsa_is_cpu_port(ds, port))
+	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
 		new_mtu += VLAN_HLEN;
 
 	policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
-- 
2.25.1


  parent reply	other threads:[~2021-08-04 13:17 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 13:16 [PATCH v2 net-next 0/8] NXP SJA1105 driver support for "H" switch topologies Vladimir Oltean
2021-08-04 13:16 ` [PATCH v2 net-next 1/8] net: dsa: rename teardown_default_cpu to teardown_cpu_ports Vladimir Oltean
2021-08-04 13:16 ` [PATCH v2 net-next 2/8] net: dsa: give preference to local CPU ports Vladimir Oltean
2021-08-04 13:16 ` [PATCH v2 net-next 3/8] net: dsa: sja1105: configure the cascade ports based on topology Vladimir Oltean
2021-08-04 13:16 ` [PATCH v2 net-next 4/8] net: dsa: sja1105: manage the forwarding domain towards DSA ports Vladimir Oltean
2021-08-04 13:16 ` [PATCH v2 net-next 5/8] net: dsa: sja1105: manage VLANs on cascade ports Vladimir Oltean
2021-08-04 13:16 ` Vladimir Oltean [this message]
2021-08-04 13:16 ` [PATCH v2 net-next 7/8] net: dsa: sja1105: suppress TX packets from looping back in "H" topologies Vladimir Oltean
2021-08-04 13:16 ` [PATCH v2 net-next 8/8] net: dsa: sja1105: enable address learning on cascade ports Vladimir Oltean
2021-08-04 13:19 ` [PATCH v2 net-next 0/8] NXP SJA1105 driver support for "H" switch topologies Vladimir Oltean

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