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net: mscc: ocelot: adjust MTU on the CPU port in NPI mode

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When using the NPI port, the DSA tag is passed through Ethernet, so the
switch's MAC needs to accept it as it comes from the DSA master. Increase
the MTU on the external CPU port to account for the length of the
injection header.

Without this patch, MTU-sized frames are dropped by the switch's CPU
port on xmit, which is especially obvious in TCP sessions.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean
2019-11-14 17:03:25 +02:00
committed by David S. Miller
parent f24711fddc
commit ba551bc3bc
2 changed files with 11 additions and 0 deletions
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9
drivers/net/ethernet/mscc/ocelot.c
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@@ -2230,9 +2230,18 @@ void ocelot_set_cpu_port(struct ocelot *ocelot, int cpu,
* Only one port can be an NPI at the same time.
*/
if (cpu < ocelot->num_phys_ports) {
int mtu = VLAN_ETH_FRAME_LEN + OCELOT_TAG_LEN;
ocelot_write(ocelot, QSYS_EXT_CPU_CFG_EXT_CPUQ_MSK_M |
QSYS_EXT_CPU_CFG_EXT_CPU_PORT(cpu),
QSYS_EXT_CPU_CFG);
if (injection == OCELOT_TAG_PREFIX_SHORT)
mtu += OCELOT_SHORT_PREFIX_LEN;
else if (injection == OCELOT_TAG_PREFIX_LONG)
mtu += OCELOT_LONG_PREFIX_LEN;
ocelot_port_set_mtu(ocelot, cpu, mtu);
}
/* CPU port Injection/Extraction configuration */