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ipv6: Append sending data to arbitrary queue

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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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2015-01-31 10:40:14 -05:00 committed by David S. Miller
parent 366e41d977
commit 0bbe84a67b
1 changed files with 67 additions and 39 deletions
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106
net/ipv6/ip6_output.c
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@ -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); EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
static inline int ip6_ufo_append_data(struct sock *sk, 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 getfrag(void *from, char *to, int offset, int len,
int odd, struct sk_buff *skb), int odd, struct sk_buff *skb),
void *from, int length, int hh_len, int fragheaderlen, 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 * device, so create one single skb packet containing complete
* udp datagram * udp datagram
*/ */
skb = skb_peek_tail(&sk->sk_write_queue); skb = skb_peek_tail(queue);
if (skb == NULL) { if (skb == NULL) {
skb = sock_alloc_send_skb(sk, skb = sock_alloc_send_skb(sk,
hh_len + fragheaderlen + transhdrlen + 20, 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->protocol = htons(ETH_P_IPV6);
skb->csum = 0; skb->csum = 0;
__skb_queue_tail(&sk->sk_write_queue, skb); __skb_queue_tail(queue, skb);
} else if (skb_is_gso(skb)) { } else if (skb_is_gso(skb)) {
goto append; goto append;
} }
@ -1203,49 +1204,36 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
return 0; return 0;
} }
int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, static int __ip6_append_data(struct sock *sk,
int offset, int len, int odd, struct sk_buff *skb), struct flowi6 *fl6,
void *from, int length, int transhdrlen, struct sk_buff_head *queue,
int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, struct inet_cork *cork,
struct rt6_info *rt, unsigned int flags, int dontfrag) 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; struct sk_buff *skb, *skb_prev = NULL;
unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu; unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu;
int exthdrlen; int exthdrlen = 0;
int dst_exthdrlen; int dst_exthdrlen = 0;
int hh_len; int hh_len;
int copy; int copy;
int err; int err;
int offset = 0; int offset = 0;
__u8 tx_flags = 0; __u8 tx_flags = 0;
u32 tskey = 0; u32 tskey = 0;
struct rt6_info *rt = (struct rt6_info *)cork->dst;
struct ipv6_txoptions *opt = v6_cork->opt;
if (flags&MSG_PROBE) skb = skb_peek_tail(queue);
return 0; if (!skb) {
cork = &inet->cork.base; exthdrlen = opt ? opt->opt_flen : 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;
dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; 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; mtu = cork->fragsize;
orig_mtu = mtu; orig_mtu = mtu;
@ -1311,13 +1299,12 @@ emsgsize:
* --yoshfuji * --yoshfuji
*/ */
skb = skb_peek_tail(&sk->sk_write_queue);
cork->length += length; cork->length += length;
if (((length > mtu) || if (((length > mtu) ||
(skb && skb_is_gso(skb))) && (skb && skb_is_gso(skb))) &&
(sk->sk_protocol == IPPROTO_UDP) && (sk->sk_protocol == IPPROTO_UDP) &&
(rt->dst.dev->features & NETIF_F_UFO)) { (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, hh_len, fragheaderlen,
transhdrlen, mtu, flags, rt); transhdrlen, mtu, flags, rt);
if (err) if (err)
@ -1458,7 +1445,7 @@ alloc_new_skb:
/* /*
* Put the packet on the pending queue * Put the packet on the pending queue
*/ */
__skb_queue_tail(&sk->sk_write_queue, skb); __skb_queue_tail(queue, skb);
continue; continue;
} }
@ -1477,7 +1464,6 @@ alloc_new_skb:
} }
} else { } else {
int i = skb_shinfo(skb)->nr_frags; int i = skb_shinfo(skb)->nr_frags;
struct page_frag *pfrag = sk_page_frag(sk);
err = -ENOMEM; err = -ENOMEM;
if (!sk_page_frag_refill(sk, pfrag)) if (!sk_page_frag_refill(sk, pfrag))
@ -1520,6 +1506,42 @@ error:
IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
return err; 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); EXPORT_SYMBOL_GPL(ip6_append_data);
static void ip6_cork_release(struct inet_cork_full *cork, static void ip6_cork_release(struct inet_cork_full *cork,
@ -1627,11 +1649,12 @@ error:
} }
EXPORT_SYMBOL_GPL(ip6_push_pending_frames); 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; 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)) if (skb_dst(skb))
IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
IPSTATS_MIB_OUTDISCARDS); 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); 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); EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);