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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-08-10 16:13:53 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-08-11 16:44:58 +0300 |
| commit | f1dacd7aea34333620bd5177a8808a3296a63184 (patch) | |
| tree | 273cc438c8f33fc92fc42757b8b10eff1c82bd74 /net/dsa/dsa_priv.h | |
| parent | 1a8e628c8a3e38af1392197adf086de7ce51d24f (diff) | |
| download | linux-f1dacd7aea34333620bd5177a8808a3296a63184.tar.xz | |
net: dsa: create a helper that strips EtherType DSA headers on RX
All header taggers open-code a memmove that is fairly not all that
obvious, and we can hide the details behind a helper function, since the
only thing specific to the driver is the length of the header tag.
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>
Diffstat (limited to 'net/dsa/dsa_priv.h')
| -rw-r--r-- | net/dsa/dsa_priv.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index 9575cabd3ec3..8a12ec1f9d21 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -452,6 +452,32 @@ static inline void dsa_default_offload_fwd_mark(struct sk_buff *skb) skb->offload_fwd_mark = !!(dp->bridge_dev); } +/* Helper for removing DSA header tags from packets in the RX path. + * Must not be called before skb_pull(len). + * skb->data + * | + * v + * | | | | | | | | | | | | | | | | | | | + * +-----------------------+-----------------------+---------------+-------+ + * | Destination MAC | Source MAC | DSA header | EType | + * +-----------------------+-----------------------+---------------+-------+ + * | | + * <----- len -----> <----- len -----> + * | + * >>>>>>> v + * >>>>>>> | | | | | | | | | | | | | | | + * >>>>>>> +-----------------------+-----------------------+-------+ + * >>>>>>> | Destination MAC | Source MAC | EType | + * +-----------------------+-----------------------+-------+ + * ^ + * | + * skb->data + */ +static inline void dsa_strip_etype_header(struct sk_buff *skb, int len) +{ + memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - len, 2 * ETH_ALEN); +} + /* switch.c */ int dsa_switch_register_notifier(struct dsa_switch *ds); void dsa_switch_unregister_notifier(struct dsa_switch *ds); |