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| author | Florian Fainelli <f.fainelli@gmail.com> | 2018-01-03 22:13:00 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-05 11:21:31 -0500 |
| commit | bf08c34086d159edde5c54902dfa2caa4d9fbd8c (patch) | |
| tree | d5cc59182650577d384f016233bc7d117dd6f57f | |
| parent | 33c30a8b68cf837b2be3e885ae0a329b880d7666 (diff) | |
| download | linux-bf08c34086d159edde5c54902dfa2caa4d9fbd8c.tar.bz2 | |
net: dsa: Move padding into Broadcom tagger
Instead of having the different master network device drivers
potentially used by DSA/Broadcom tags, move the padding necessary for
the switches to accept short packets where it makes most sense: within
tag_brcm.c. This avoids multiplying the number of similar commits to
e.g: bgmac, bcmsysport, etc.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/dsa/tag_brcm.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c index e6e0b7b6025c..2b06bb91318b 100644 --- a/net/dsa/tag_brcm.c +++ b/net/dsa/tag_brcm.c @@ -70,6 +70,18 @@ static struct sk_buff *brcm_tag_xmit_ll(struct sk_buff *skb, if (skb_cow_head(skb, BRCM_TAG_LEN) < 0) return NULL; + /* The Ethernet switch we are interfaced with needs packets to be at + * least 64 bytes (including FCS) otherwise they will be discarded when + * they enter the switch port logic. When Broadcom tags are enabled, we + * need to make sure that packets are at least 68 bytes + * (including FCS and tag) because the length verification is done after + * the Broadcom tag is stripped off the ingress packet. + * + * Let dsa_slave_xmit() free the SKB + */ + if (__skb_put_padto(skb, ETH_ZLEN + BRCM_TAG_LEN, false)) + return NULL; + skb_push(skb, BRCM_TAG_LEN); if (offset) |