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tcp: add gfp parameter to tcp_fragment

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tcp_fragment can be called from process context (from tso_fragment).
Add a new gfp parameter to allow it to preserve atomic memory if
possible.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Reviewed-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Octavian Purdila 2014-06-06 17:32:37 +03:00 committed by David S. Miller
parent 27fa589de5
commit 6cc55e096f
3 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/tcp.h
View File

@ -535,7 +535,7 @@ void tcp_retransmit_timer(struct sock *sk);
void tcp_xmit_retransmit_queue(struct sock *);
void tcp_simple_retransmit(struct sock *);
int tcp_trim_head(struct sock *, struct sk_buff *, u32);
int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int);
int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int, gfp_t);
void tcp_send_probe0(struct sock *);
void tcp_send_partial(struct sock *);

5
net/ipv4/tcp_input.c
View File

@ -1167,7 +1167,7 @@ static int tcp_match_skb_to_sack(struct sock *sk, struct sk_buff *skb,
}
pkt_len = new_len;
}
err = tcp_fragment(sk, skb, pkt_len, mss);
err = tcp_fragment(sk, skb, pkt_len, mss, GFP_ATOMIC);
if (err < 0)
return err;
}
@ -2241,7 +2241,8 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int mark_head)
break;
mss = skb_shinfo(skb)->gso_size;
err = tcp_fragment(sk, skb, (packets - oldcnt) * mss, mss);
err = tcp_fragment(sk, skb, (packets - oldcnt) * mss,
mss, GFP_ATOMIC);
if (err < 0)
break;
cnt = packets;

15
net/ipv4/tcp_output.c
View File

@ -1074,7 +1074,7 @@ static void tcp_adjust_pcount(struct sock *sk, const struct sk_buff *skb, int de
* Remember, these are still headerless SKBs at this point.
*/
int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
unsigned int mss_now)
unsigned int mss_now, gfp_t gfp)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *buff;
@ -1089,11 +1089,11 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
if (nsize < 0)
nsize = 0;
if (skb_unclone(skb, GFP_ATOMIC))
if (skb_unclone(skb, gfp))
return -ENOMEM;
/* Get a new skb... force flag on. */
buff = sk_stream_alloc_skb(sk, nsize, GFP_ATOMIC);
buff = sk_stream_alloc_skb(sk, nsize, gfp);
if (buff == NULL)
return -ENOMEM; /* We'll just try again later. */
@ -1625,7 +1625,7 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
/* All of a TSO frame must be composed of paged data. */
if (skb->len != skb->data_len)
return tcp_fragment(sk, skb, len, mss_now);
return tcp_fragment(sk, skb, len, mss_now, gfp);
buff = sk_stream_alloc_skb(sk, 0, gfp);
if (unlikely(buff == NULL))
@ -2122,7 +2122,8 @@ void tcp_send_loss_probe(struct sock *sk)
goto rearm_timer;
if ((pcount > 1) && (skb->len > (pcount - 1) * mss)) {
if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss)))
if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss,
GFP_ATOMIC)))
goto rearm_timer;
skb = tcp_write_queue_tail(sk);
}
@ -2463,7 +2464,7 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
return -EAGAIN;
if (skb->len > cur_mss) {
if (tcp_fragment(sk, skb, cur_mss, cur_mss))
if (tcp_fragment(sk, skb, cur_mss, cur_mss, GFP_ATOMIC))
return -ENOMEM; /* We'll try again later. */
} else {
int oldpcount = tcp_skb_pcount(skb);
@ -3244,7 +3245,7 @@ int tcp_write_wakeup(struct sock *sk)
skb->len > mss) {
seg_size = min(seg_size, mss);
TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH;
if (tcp_fragment(sk, skb, seg_size, mss))
if (tcp_fragment(sk, skb, seg_size, mss, GFP_ATOMIC))
return -1;
} else if (!tcp_skb_pcount(skb))
tcp_set_skb_tso_segs(sk, skb, mss);