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authorEric Dumazet <eric.dumazet@gmail.com>2010-05-31 23:44:05 -0700
committerDavid S. Miller <davem@davemloft.net>2010-05-31 23:44:05 -0700
commitb1faf5666438090a4dc4fceac8502edc7788b7e3 (patch)
treef90808dea27cc38aff6feed1782e2a5666fa6ee9 /net/core
parentbc284f94f84c3d76e49c6f3df9028c503f9589d9 (diff)
downloadop-kernel-dev-b1faf5666438090a4dc4fceac8502edc7788b7e3.zip
op-kernel-dev-b1faf5666438090a4dc4fceac8502edc7788b7e3.tar.gz
net: sock_queue_err_skb() dont mess with sk_forward_alloc
Correct sk_forward_alloc handling for error_queue would need to use a backlog of frames that softirq handler could not deliver because socket is owned by user thread. Or extend backlog processing to be able to process normal and error packets. Another possibility is to not use mem charge for error queue, this is what I implemented in this patch. Note: this reverts commit 29030374 (net: fix sk_forward_alloc corruptions), since we dont need to lock socket anymore. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/skbuff.c30
1 files changed, 28 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4e7ac09..9f07e74 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2965,6 +2965,34 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
}
EXPORT_SYMBOL_GPL(skb_cow_data);
+static void sock_rmem_free(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
+}
+
+/*
+ * Note: We dont mem charge error packets (no sk_forward_alloc changes)
+ */
+int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
+{
+ if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+ (unsigned)sk->sk_rcvbuf)
+ return -ENOMEM;
+
+ skb_orphan(skb);
+ skb->sk = sk;
+ skb->destructor = sock_rmem_free;
+ atomic_add(skb->truesize, &sk->sk_rmem_alloc);
+
+ skb_queue_tail(&sk->sk_error_queue, skb);
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_data_ready(sk, skb->len);
+ return 0;
+}
+EXPORT_SYMBOL(sock_queue_err_skb);
+
void skb_tstamp_tx(struct sk_buff *orig_skb,
struct skb_shared_hwtstamps *hwtstamps)
{
@@ -2997,9 +3025,7 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
- bh_lock_sock(sk);
err = sock_queue_err_skb(sk, skb);
- bh_unlock_sock(sk);
if (err)
kfree_skb(skb);
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