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can: rework skb reserved data handling 

Added accessor and skb_reserve helpers for struct can_skb_priv.
Removed pointless skb_headroom() check.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
CC: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oliver Hartkopp 2013-01-28 08:33:33 +00:00 committed by David S. Miller
parent cef401de7b
commit 2bf3440d7b
6 changed files with 21 additions and 13 deletions
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4
drivers/net/can/dev.c
View File

@ -512,8 +512,8 @@ struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
skb->pkt_type = PACKET_BROADCAST;
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb_reserve(skb, sizeof(struct can_skb_priv));
((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex;
can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = dev->ifindex;
*cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
memset(*cf, 0, sizeof(struct can_frame));

4
drivers/net/can/slcan.c
View File

@ -195,8 +195,8 @@ static void slc_bump(struct slcan *sl)
skb->pkt_type = PACKET_BROADCAST;
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb_reserve(skb, sizeof(struct can_skb_priv));
((struct can_skb_priv *)(skb->head))->ifindex = sl->dev->ifindex;
can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = sl->dev->ifindex;
memcpy(skb_put(skb, sizeof(struct can_frame)),
&cf, sizeof(struct can_frame));

10
include/linux/can/skb.h
View File

@ -32,4 +32,14 @@ struct can_skb_priv {
struct can_frame cf[0];
};
static inline struct can_skb_priv *can_skb_prv(struct sk_buff *skb)
{
return (struct can_skb_priv *)(skb->head);
}
static inline void can_skb_reserve(struct sk_buff *skb)
{
skb_reserve(skb, sizeof(struct can_skb_priv));
}
#endif /* CAN_SKB_H */

8
net/can/bcm.c
View File

@ -261,8 +261,8 @@ static void bcm_can_tx(struct bcm_op *op)
if (!skb)
goto out;
skb_reserve(skb, sizeof(struct can_skb_priv));
((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex;
can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = dev->ifindex;
memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
@ -1207,7 +1207,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
if (!skb)
return -ENOMEM;
skb_reserve(skb, sizeof(struct can_skb_priv));
can_skb_reserve(skb);
err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
if (err < 0) {
@ -1221,7 +1221,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
return -ENODEV;
}
((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex;
can_skb_prv(skb)->ifindex = dev->ifindex;
skb->dev = dev;
skb->sk = sk;
err = can_send(skb, 1); /* send with loopback */

4
net/can/gw.c
View File

@ -381,9 +381,7 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
/* is sending the skb back to the incoming interface not allowed? */
if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
skb_headroom(skb) == sizeof(struct can_skb_priv) &&
(((struct can_skb_priv *)(skb->head))->ifindex ==
gwj->dst.dev->ifindex))
can_skb_prv(skb)->ifindex == gwj->dst.dev->ifindex)
return;
/*

4
net/can/raw.c
View File

@ -705,8 +705,8 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
if (!skb)
goto put_dev;
skb_reserve(skb, sizeof(struct can_skb_priv));
((struct can_skb_priv *)(skb->head))->ifindex = dev->ifindex;
can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = dev->ifindex;
err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
if (err < 0)