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| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2013-01-17 18:43:39 +0100 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2013-01-26 16:59:01 +0100 |
| commit | 156c2bb9f88065c8da78814f98fde665a5cbb527 (patch) | |
| tree | ecd77a89c19ed0e1d420568f85769d7289ac3a37 /ipc/msg.c | |
| parent | e2d5f2c7d66224c1a401ed1f797e467c02c025b8 (diff) | |
| download | op-kernel-dev-156c2bb9f88065c8da78814f98fde665a5cbb527.zip op-kernel-dev-156c2bb9f88065c8da78814f98fde665a5cbb527.tar.gz | |
can: add private data space for CAN sk_buffs
The struct can_skb_priv is used to transport additional information along
with the stored struct can(fd)_frame that can not be contained in existing
struct sk_buff elements.
can_skb_priv is located in the skb headroom, which does not touch the existing
CAN sk_buff usage with skb->data and skb->len, so that even out-of-tree
CAN drivers can be used without changes.
Btw. out-of-tree CAN drivers without can_skb_priv in the sk_buff headroom
would not support features based on can_skb_priv.
The can_skb_priv->ifindex contains the first interface where the CAN frame
appeared on the local host. Unfortunately skb->skb_iif can not be used as this
value is overwritten in every netif_receive_skb() call.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'ipc/msg.c')
0 files changed, 0 insertions, 0 deletions
