netdev - [PATCH 6/9 v1 RFC] skbuff: Call sock_zerocopy_put_abort from skb_zcopy_put

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Message-ID: <20201218201633.2735367-7-jonathan.lemon@gmail.com>
Date:   Fri, 18 Dec 2020 12:16:30 -0800
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>, <edumazet@...gle.com>,
        <willemdebruijn.kernel@...il.com>
CC:     <kernel-team@...com>
Subject: [PATCH 6/9 v1 RFC] skbuff: Call sock_zerocopy_put_abort from skb_zcopy_put_abort

From: Jonathan Lemon <bsd@...com>

The sock_zerocopy_put_abort function contains logic which is
specific to the current zerocopy implementation.  Add a wrapper
which checks the callback and dispatches apppropriately.

Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
 include/linux/skbuff.h | 10 ++++++++++
 net/core/skbuff.c      | 12 +++++-------
 net/ipv4/ip_output.c   |  3 +--
 net/ipv4/tcp.c         |  2 +-
 net/ipv6/ip6_output.c  |  3 +--
 5 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 64ae6f3adcd5..a50d52b796a7 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1480,6 +1480,16 @@ static inline void skb_zcopy_put(struct ubuf_info *uarg)
 		uarg->callback(NULL, uarg, true);
 }
 
+static inline void skb_zcopy_put_abort(struct ubuf_info *uarg, bool have_uref)
+{
+	if (uarg) {
+		if (uarg->callback == sock_zerocopy_callback)
+			sock_zerocopy_put_abort(uarg, have_uref);
+		else if (have_uref)
+			skb_zcopy_put(uarg);
+	}
+}
+
 /* Release a reference on a zerocopy structure */
 static inline void skb_zcopy_clear(struct sk_buff *skb, bool succsss)
 {
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 328385cd141e..8352da29f052 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1254,15 +1254,13 @@ EXPORT_SYMBOL_GPL(sock_zerocopy_callback);
 
 void sock_zerocopy_put_abort(struct ubuf_info *uarg, bool have_uref)
 {
-	if (uarg) {
-		struct sock *sk = skb_from_uarg(uarg)->sk;
+	struct sock *sk = skb_from_uarg(uarg)->sk;
 
-		atomic_dec(&sk->sk_zckey);
-		uarg->len--;
+	atomic_dec(&sk->sk_zckey);
+	uarg->len--;
 
-		if (have_uref)
-			skb_zcopy_put(uarg);
-	}
+	if (have_uref)
+		sock_zerocopy_callback(NULL, uarg, true);
 }
 EXPORT_SYMBOL_GPL(sock_zerocopy_put_abort);
 
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 879b76ae4435..65f2299fd682 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1230,8 +1230,7 @@ static int __ip_append_data(struct sock *sk,
 error_efault:
 	err = -EFAULT;
 error:
-	if (uarg)
-		sock_zerocopy_put_abort(uarg, extra_uref);
+	skb_zcopy_put_abort(uarg, extra_uref);
 	cork->length -= length;
 	IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS);
 	refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5c38080df13f..900b6bb7b280 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1440,7 +1440,7 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
 	if (copied + copied_syn)
 		goto out;
 out_err:
-	sock_zerocopy_put_abort(uarg, true);
+	skb_zcopy_put_abort(uarg, true);
 	err = sk_stream_error(sk, flags, err);
 	/* make sure we wake any epoll edge trigger waiter */
 	if (unlikely(tcp_rtx_and_write_queues_empty(sk) && err == -EAGAIN)) {
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 749ad72386b2..c8c87891533a 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1715,8 +1715,7 @@ static int __ip6_append_data(struct sock *sk,
 error_efault:
 	err = -EFAULT;
 error:
-	if (uarg)
-		sock_zerocopy_put_abort(uarg, extra_uref);
+	skb_zcopy_put_abort(uarg, extra_uref);
 	cork->length -= length;
 	IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
 	refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc);
-- 
2.24.1