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net: introduce skb_list_walk_safe for skb segment walking

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As part of the continual effort to remove direct usage of skb->next and
skb->prev, this patch adds a helper for iterating through the
singly-linked variant of skb lists, which are used for lists of GSO
packet. The name "skb_list_..." has been chosen to match the existing
function, "kfree_skb_list, which also operates on these singly-linked
lists, and the "..._walk_safe" part is the same idiom as elsewhere in
the kernel.

This patch removes the helper from wireguard and puts it into
linux/skbuff.h, while making it a bit more robust for general usage. In
particular, parenthesis are added around the macro argument usage, and it
now accounts for trying to iterate through an already-null skb pointer,
which will simply run the iteration zero times. This latter enhancement
means it can be used to replace both do { ... } while and while (...)
open-coded idioms.

This should take care of these three possible usages, which match all
current methods of iterations.

skb_list_walk_safe(segs, skb, next) { ... }
skb_list_walk_safe(skb, skb, next) { ... }
skb_list_walk_safe(segs, skb, segs) { ... }

Gcc appears to generate efficient code for each of these.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2020-01-08 16:59:02 -05:00 committed by David S. Miller
parent 542d3065f2
commit dcfea72e79
2 changed files with 5 additions and 8 deletions
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8
drivers/net/wireguard/device.h
View File

@ -62,12 +62,4 @@ struct wg_device {
int wg_device_init(void);
void wg_device_uninit(void);
/* Later after the dust settles, this can be moved into include/linux/skbuff.h,
* where virtually all code that deals with GSO segs can benefit, around ~30
* drivers as of writing.
*/
#define skb_list_walk_safe(first, skb, next) \
for (skb = first, next = skb->next; skb; \
skb = next, next = skb ? skb->next : NULL)
#endif /* _WG_DEVICE_H */

5
include/linux/skbuff.h
View File

@ -1478,6 +1478,11 @@ static inline void skb_mark_not_on_list(struct sk_buff *skb)
skb->next = NULL;
}
/* Iterate through singly-linked GSO fragments of an skb. */
#define skb_list_walk_safe(first, skb, next) \
for ((skb) = (first), (next) = (skb) ? (skb)->next : NULL; (skb); \
(skb) = (next), (next) = (skb) ? (skb)->next : NULL)
static inline void skb_list_del_init(struct sk_buff *skb)
{
__list_del_entry(&skb->list);