netdev - [PATCH] libbpf: add support for canceling cached

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Message-Id: <1606050623-22963-1-git-send-email-lirongqing@baidu.com>
Date:   Sun, 22 Nov 2020 21:10:23 +0800
From:   Li RongQing <lirongqing@...du.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH] libbpf: add support for canceling cached_cons advance

It is possible to fail receiving packets after calling
xsk_ring_cons__peek, at this condition, cached_cons has
been advanced, should be cancelled.

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 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..4128215c246b 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)
+{
+	rx->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