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| author |   Li RongQing <lirongqing@baidu.com> | 2020-11-24 15:21:14 +0800 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2020-11-25 13:18:47 +0100 |
| commit | db13db9f67fe5049159a05e870daedcee5879f8d (patch) | |
| tree | 96e63b5d852f2863129b502775d7da57e0255995 | |
| parent | bpf: Refactor check_cfg to use a structured loop. (diff) | |
| download | linux-dev-db13db9f67fe5049159a05e870daedcee5879f8d.tar.xz linux-dev-db13db9f67fe5049159a05e870daedcee5879f8d.zip | |
libbpf: Add support for canceling cached_cons advance
Add a new function for returning descriptors the user received
after an xsk_ring_cons__peek call. After the application has
gotten a number of descriptors from a ring, it might not be able
to or want to process them all for various reasons. Therefore,
it would be useful to have an interface for returning or
cancelling a number of them so that they are returned to the ring.
This patch adds a new function called xsk_ring_cons__cancel that
performs this operation on nb descriptors counted from the end of
the batch of descriptors that was received through the peek call.
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
[ Magnus Karlsson: rewrote changelog ]
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/1606202474-8119-1-git-send-email-lirongqing@baidu.com
| -rw-r--r-- | tools/lib/bpf/xsk.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/lib/bpf/xsk.h b/tools/lib/bpf/xsk.h index 1069c46364ff..1719a327e5f9 100644 --- a/tools/lib/bpf/xsk.h +++ b/tools/lib/bpf/xsk.h @@ -153,6 +153,12 @@ static inline size_t xsk_ring_cons__peek(struct xsk_ring_cons *cons, return entries; } +static inline void xsk_ring_cons__cancel(struct xsk_ring_cons *cons, + size_t nb) +{ + cons->cached_cons -= nb; +} + static inline void xsk_ring_cons__release(struct xsk_ring_cons *cons, size_t nb) { /* Make sure data has been read before indicating we are done |