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Date: Fri, 19 Jul 2013 19:40:09 +0200
From: Richard Cochran <richardcochran@...il.com>
To: <netdev@...r.kernel.org>
Cc: David Miller <davem@...emloft.net>,
"Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH net-next 1/2] Provide a generic socket error queue delivery method for Tx time stamps.
This patch moves the private error queue delivery function from the
af_packet code to the core socket method. In this way, network layers
only needing the error queue for transmit time stamping can share common
code.
Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
include/net/sock.h | 2 ++
net/core/sock.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
net/packet/af_packet.c | 48 ++----------------------------------------------
3 files changed, 51 insertions(+), 46 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 95a5a2c..e0473f6 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2249,6 +2249,8 @@ static inline struct sock *skb_steal_sock(struct sk_buff *skb)
extern void sock_enable_timestamp(struct sock *sk, int flag);
extern int sock_get_timestamp(struct sock *, struct timeval __user *);
extern int sock_get_timestampns(struct sock *, struct timespec __user *);
+extern int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
+ int level, int type);
/*
* Enable debug/info messages
diff --git a/net/core/sock.c b/net/core/sock.c
index 548d716..85e8de1 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -93,6 +93,7 @@
#include <linux/capability.h>
#include <linux/errno.h>
+#include <linux/errqueue.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
@@ -2425,6 +2426,52 @@ void sock_enable_timestamp(struct sock *sk, int flag)
}
}
+int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
+ int level, int type)
+{
+ struct sock_exterr_skb *serr;
+ struct sk_buff *skb, *skb2;
+ int copied, err;
+
+ err = -EAGAIN;
+ skb = skb_dequeue(&sk->sk_error_queue);
+ if (skb == NULL)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ if (err)
+ goto out_free_skb;
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ serr = SKB_EXT_ERR(skb);
+ put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
+
+ msg->msg_flags |= MSG_ERRQUEUE;
+ err = copied;
+
+ /* Reset and regenerate socket error */
+ spin_lock_bh(&sk->sk_error_queue.lock);
+ sk->sk_err = 0;
+ if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
+ sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
+ spin_unlock_bh(&sk->sk_error_queue.lock);
+ sk->sk_error_report(sk);
+ } else
+ spin_unlock_bh(&sk->sk_error_queue.lock);
+
+out_free_skb:
+ kfree_skb(skb);
+out:
+ return err;
+}
+EXPORT_SYMBOL(sock_recv_errqueue);
+
/*
* Get a socket option on an socket.
*
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 4b66c75..4cb28a7 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2638,51 +2638,6 @@ out:
return err;
}
-static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
-{
- struct sock_exterr_skb *serr;
- struct sk_buff *skb, *skb2;
- int copied, err;
-
- err = -EAGAIN;
- skb = skb_dequeue(&sk->sk_error_queue);
- if (skb == NULL)
- goto out;
-
- copied = skb->len;
- if (copied > len) {
- msg->msg_flags |= MSG_TRUNC;
- copied = len;
- }
- err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
- if (err)
- goto out_free_skb;
-
- sock_recv_timestamp(msg, sk, skb);
-
- serr = SKB_EXT_ERR(skb);
- put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
- sizeof(serr->ee), &serr->ee);
-
- msg->msg_flags |= MSG_ERRQUEUE;
- err = copied;
-
- /* Reset and regenerate socket error */
- spin_lock_bh(&sk->sk_error_queue.lock);
- sk->sk_err = 0;
- if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
- sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
- spin_unlock_bh(&sk->sk_error_queue.lock);
- sk->sk_error_report(sk);
- } else
- spin_unlock_bh(&sk->sk_error_queue.lock);
-
-out_free_skb:
- kfree_skb(skb);
-out:
- return err;
-}
-
/*
* Pull a packet from our receive queue and hand it to the user.
* If necessary we block.
@@ -2708,7 +2663,8 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
#endif
if (flags & MSG_ERRQUEUE) {
- err = packet_recv_error(sk, msg, len);
+ err = sock_recv_errqueue(sk, msg, len,
+ SOL_PACKET, PACKET_TX_TIMESTAMP);
goto out;
}
--
1.7.10.4
--
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