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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2020-03-10 03:28:18 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-09 18:58:17 -0700 |
| commit | a8015ded89ad740d21355470d41879c5bd82aab7 (patch) | |
| tree | 0a1b1598c37cc919cd29e420eac160a9694c4cc8 /include/soc | |
| parent | afe207d80a61e4d6e7cfa0611a4af46d0ba95628 (diff) | |
| download | linux-a8015ded89ad740d21355470d41879c5bd82aab7.tar.gz linux-a8015ded89ad740d21355470d41879c5bd82aab7.tar.bz2 linux-a8015ded89ad740d21355470d41879c5bd82aab7.zip | |
net: mscc: ocelot: properly account for VLAN header length when setting MRU
What the driver writes into MAC_MAXLEN_CFG does not actually represent
VLAN_ETH_FRAME_LEN but instead ETH_FRAME_LEN + ETH_FCS_LEN. Yes they are
numerically equal, but the difference is important, as the switch treats
VLAN-tagged traffic specially and knows to increase the maximum accepted
frame size automatically. So it is always wrong to account for VLAN in
the MAC_MAXLEN_CFG register.
Unconditionally increase the maximum allowed frame size for
double-tagged traffic. Accounting for the additional length does not
mean that the other VLAN membership checks aren't performed, so there's
no harm done.
Also, stop abusing the MTU name for configuring the MRU. There is no
support for configuring the MRU on an interface at the moment.
Fixes: a556c76adc05 ("net: mscc: Add initial Ocelot switch support")
Fixes: fa914e9c4d94 ("net: mscc: ocelot: create a helper for changing the port MTU")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/soc')
| -rw-r--r-- | include/soc/mscc/ocelot_dev.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/soc/mscc/ocelot_dev.h b/include/soc/mscc/ocelot_dev.h index 0a50d53bbd3f..7c08437061fc 100644 --- a/include/soc/mscc/ocelot_dev.h +++ b/include/soc/mscc/ocelot_dev.h @@ -74,7 +74,7 @@ #define DEV_MAC_TAGS_CFG_TAG_ID_M GENMASK(31, 16) #define DEV_MAC_TAGS_CFG_TAG_ID_X(x) (((x) & GENMASK(31, 16)) >> 16) #define DEV_MAC_TAGS_CFG_VLAN_LEN_AWR_ENA BIT(2) -#define DEV_MAC_TAGS_CFG_PB_ENA BIT(1) +#define DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA BIT(1) #define DEV_MAC_TAGS_CFG_VLAN_AWR_ENA BIT(0) #define DEV_MAC_ADV_CHK_CFG 0x2c |