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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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dcfea72e79
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>
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| .. | ||
| selftest | ||
| allowedips.c | ||
| allowedips.h | ||
| cookie.c | ||
| cookie.h | ||
| device.c | ||
| device.h | ||
| main.c | ||
| Makefile | ||
| messages.h | ||
| netlink.c | ||
| netlink.h | ||
| noise.c | ||
| noise.h | ||
| peer.c | ||
| peer.h | ||
| peerlookup.c | ||
| peerlookup.h | ||
| queueing.c | ||
| queueing.h | ||
| ratelimiter.c | ||
| ratelimiter.h | ||
| receive.c | ||
| send.c | ||
| socket.c | ||
| socket.h | ||
| timers.c | ||
| timers.h | ||
| version.h | ||