From: Li RongQing <lirongqing@baidu.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org, magnus.karlsson@intel.com
Subject: [PATCH][V2] libbpf: add support for canceling cached_cons advance
Date: Tue, 24 Nov 2020 15:21:14 +0800 [thread overview]
Message-ID: <1606202474-8119-1-git-send-email-lirongqing@baidu.com> (raw)
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>
[ Magnus Karlsson: rewrote changelog ]
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
---
diff with v1: fix the building, and rewrote changelog
tools/lib/bpf/xsk.h | 6 ++++++
1 file changed, 6 insertions(+)
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
--
2.17.3
next reply other threads:[~2020-11-24 7:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 7:21 Li RongQing [this message]
2020-11-24 8:12 ` [PATCH][V2] libbpf: add support for canceling cached_cons advance Magnus Karlsson
2020-11-24 21:58 ` Daniel Borkmann
2020-11-25 8:30 ` Magnus Karlsson
2020-11-25 9:02 ` Daniel Borkmann
2020-11-25 9:13 ` Magnus Karlsson
2020-11-25 10:06 ` Daniel Borkmann
2020-11-25 10:09 ` Magnus Karlsson
2020-11-25 12:22 ` Daniel Borkmann
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