android/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dsa: mv88e6xxx: Include tagger overhead when setting MTU for DSA and CPU ports

Browse Source 
[ Upstream commit b9c587fed61cf88bd45822c3159644445f6d5aa6 ]

Same members of the Marvell Ethernet switches impose MTU restrictions
on ports used for connecting to the CPU or another switch for DSA. If
the MTU is set too low, tagged frames will be discarded. Ensure the
worst case tagger overhead is included in setting the MTU for DSA and
CPU ports.

Fixes: 1baf0fac10 ("net: dsa: mv88e6xxx: Use chip-wide max frame size for MTU")
Reported by: 曹煜 <cao88yu@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrew Lunn 2021-09-26 19:41:26 +02:00 committed by Greg Kroah-Hartman
parent 7b771b1222
commit c20a0ad7b6
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/dsa/mv88e6xxx/chip.c
View File

@ -2718,10 +2718,10 @@ static int mv88e6xxx_get_max_mtu(struct dsa_switch *ds, int port)
struct mv88e6xxx_chip *chip = ds->priv;
if (chip->info->ops->port_set_jumbo_size)
return 10240 - VLAN_ETH_HLEN - ETH_FCS_LEN;
return 10240 - VLAN_ETH_HLEN - EDSA_HLEN - ETH_FCS_LEN;
else if (chip->info->ops->set_max_frame_size)
return 1632 - VLAN_ETH_HLEN - ETH_FCS_LEN;
return 1522 - VLAN_ETH_HLEN - ETH_FCS_LEN;
return 1632 - VLAN_ETH_HLEN - EDSA_HLEN - ETH_FCS_LEN;
return 1522 - VLAN_ETH_HLEN - EDSA_HLEN - ETH_FCS_LEN;
}
static int mv88e6xxx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
@ -2729,6 +2729,9 @@ static int mv88e6xxx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
struct mv88e6xxx_chip *chip = ds->priv;
int ret = 0;
if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
new_mtu += EDSA_HLEN;
mv88e6xxx_reg_lock(chip);
if (chip->info->ops->port_set_jumbo_size)
ret = chip->info->ops->port_set_jumbo_size(chip, port, new_mtu);

1
drivers/net/dsa/mv88e6xxx/chip.h
View File

@ -18,6 +18,7 @@
#include <linux/timecounter.h>
#include <net/dsa.h>
#define EDSA_HLEN 8
#define MV88E6XXX_N_FID 4096
/* PVT limits for 4-bit port and 5-bit switch */