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Date: Sat, 31 Jan 2015 10:40:14 -0500
From: Vladislav Yasevich <vyasevich@...il.com>
To: netdev@...r.kernel.org
Cc: herbert@...dor.apana.org.au, hannes@...essinduktion.org,
Vladislav Yasevich <vyasevic@...hat.com>
Subject: [PATCH net-next 2/6] ipv6: Append sending data to arbitrary queue
Add the ability to append data to arbitrary queue. This
will be needed later to implement lockless UDP sends.
Signed-off-by: Vladislav Yasevich <vyasevic@...hat.com>
---
net/ipv6/ip6_output.c | 106 +++++++++++++++++++++++++++++++-------------------
1 file changed, 67 insertions(+), 39 deletions(-)
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index f9f08c4..1b66453 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1041,6 +1041,7 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
static inline int ip6_ufo_append_data(struct sock *sk,
+ struct sk_buff_head *queue,
int getfrag(void *from, char *to, int offset, int len,
int odd, struct sk_buff *skb),
void *from, int length, int hh_len, int fragheaderlen,
@@ -1056,7 +1057,7 @@ static inline int ip6_ufo_append_data(struct sock *sk,
* device, so create one single skb packet containing complete
* udp datagram
*/
- skb = skb_peek_tail(&sk->sk_write_queue);
+ skb = skb_peek_tail(queue);
if (skb == NULL) {
skb = sock_alloc_send_skb(sk,
hh_len + fragheaderlen + transhdrlen + 20,
@@ -1079,7 +1080,7 @@ static inline int ip6_ufo_append_data(struct sock *sk,
skb->protocol = htons(ETH_P_IPV6);
skb->csum = 0;
- __skb_queue_tail(&sk->sk_write_queue, skb);
+ __skb_queue_tail(queue, skb);
} else if (skb_is_gso(skb)) {
goto append;
}
@@ -1203,49 +1204,36 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
return 0;
}
-int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
- int offset, int len, int odd, struct sk_buff *skb),
- void *from, int length, int transhdrlen,
- int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
- struct rt6_info *rt, unsigned int flags, int dontfrag)
+static int __ip6_append_data(struct sock *sk,
+ struct flowi6 *fl6,
+ struct sk_buff_head *queue,
+ struct inet_cork *cork,
+ struct inet6_cork *v6_cork,
+ struct page_frag *pfrag,
+ int getfrag(void *from, char *to, int offset,
+ int len, int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen,
+ unsigned int flags, int dontfrag)
{
- struct inet_sock *inet = inet_sk(sk);
- struct ipv6_pinfo *np = inet6_sk(sk);
- struct inet_cork *cork;
struct sk_buff *skb, *skb_prev = NULL;
unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;
- int exthdrlen;
- int dst_exthdrlen;
+ int exthdrlen = 0;
+ int dst_exthdrlen = 0;
int hh_len;
int copy;
int err;
int offset = 0;
__u8 tx_flags = 0;
u32 tskey = 0;
+ struct rt6_info *rt = (struct rt6_info *)cork->dst;
+ struct ipv6_txoptions *opt = v6_cork->opt;
- if (flags&MSG_PROBE)
- return 0;
- cork = &inet->cork.base;
- if (skb_queue_empty(&sk->sk_write_queue)) {
- /*
- * setup for corking
- */
- err = ip6_setup_cork(sk, &inet->cork, &np->cork, hlimit,
- tclass, opt, rt, fl6);
- if (err)
- return err;
- exthdrlen = (opt ? opt->opt_flen : 0);
- length += exthdrlen;
- transhdrlen += exthdrlen;
+ skb = skb_peek_tail(queue);
+ if (!skb) {
+ exthdrlen = opt ? opt->opt_flen : 0;
dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
- } else {
- rt = (struct rt6_info *)cork->dst;
- fl6 = &inet->cork.fl.u.ip6;
- opt = np->cork.opt;
- transhdrlen = 0;
- exthdrlen = 0;
- dst_exthdrlen = 0;
}
+
mtu = cork->fragsize;
orig_mtu = mtu;
@@ -1311,13 +1299,12 @@ emsgsize:
* --yoshfuji
*/
- skb = skb_peek_tail(&sk->sk_write_queue);
cork->length += length;
if (((length > mtu) ||
(skb && skb_is_gso(skb))) &&
(sk->sk_protocol == IPPROTO_UDP) &&
(rt->dst.dev->features & NETIF_F_UFO)) {
- err = ip6_ufo_append_data(sk, getfrag, from, length,
+ err = ip6_ufo_append_data(sk, queue, getfrag, from, length,
hh_len, fragheaderlen,
transhdrlen, mtu, flags, rt);
if (err)
@@ -1458,7 +1445,7 @@ alloc_new_skb:
/*
* Put the packet on the pending queue
*/
- __skb_queue_tail(&sk->sk_write_queue, skb);
+ __skb_queue_tail(queue, skb);
continue;
}
@@ -1477,7 +1464,6 @@ alloc_new_skb:
}
} else {
int i = skb_shinfo(skb)->nr_frags;
- struct page_frag *pfrag = sk_page_frag(sk);
err = -ENOMEM;
if (!sk_page_frag_refill(sk, pfrag))
@@ -1520,6 +1506,42 @@ error:
IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
return err;
}
+
+int ip6_append_data(struct sock *sk,
+ int getfrag(void *from, char *to, int offset, int len,
+ int odd, struct sk_buff *skb),
+ void *from, int length, int transhdrlen, int hlimit,
+ int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
+ struct rt6_info *rt, unsigned int flags, int dontfrag)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int exthdrlen;
+ int err;
+
+ if (flags&MSG_PROBE)
+ return 0;
+ if (skb_queue_empty(&sk->sk_write_queue)) {
+ /*
+ * setup for corking
+ */
+ err = ip6_setup_cork(sk, &inet->cork, &np->cork, hlimit,
+ tclass, opt, rt, fl6);
+ if (err)
+ return err;
+
+ exthdrlen = (opt ? opt->opt_flen : 0);
+ length += exthdrlen;
+ transhdrlen += exthdrlen;
+ } else {
+ fl6 = &inet->cork.fl.u.ip6;
+ transhdrlen = 0;
+ }
+
+ return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
+ &np->cork, sk_page_frag(sk), getfrag,
+ from, length, transhdrlen, flags, dontfrag);
+}
EXPORT_SYMBOL_GPL(ip6_append_data);
static void ip6_cork_release(struct inet_cork_full *cork,
@@ -1627,11 +1649,12 @@ error:
}
EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
-void ip6_flush_pending_frames(struct sock *sk)
+static void __ip6_flush_pending_frames(struct sock *sk,
+ struct sk_buff_head *queue)
{
struct sk_buff *skb;
- while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) {
+ while ((skb = __skb_dequeue_tail(queue)) != NULL) {
if (skb_dst(skb))
IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
IPSTATS_MIB_OUTDISCARDS);
@@ -1640,4 +1663,9 @@ void ip6_flush_pending_frames(struct sock *sk)
ip6_cork_release(&inet_sk(sk)->cork, &inet6_sk(sk)->cork);
}
+
+void ip6_flush_pending_frames(struct sock *sk)
+{
+ __ip6_flush_pending_frames(sk, &sk->sk_write_queue);
+}
EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
--
1.9.3
--
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