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net: add a limit parameter to sk_add_backlog() 

sk_add_backlog() & sk_rcvqueues_full() hard coded sk_rcvbuf as the
memory limit. We need to make this limit a parameter for TCP use.

No functional change expected in this patch, all callers still using the
old sk_rcvbuf limit.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Cc: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-04-22 23:34:26 +00:00 committed by David S. Miller
parent b98985073b
commit f545a38f74
10 changed files with 21 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/net/sock.h
View File

@ -709,17 +709,19 @@ static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
* Do not take into account this skb truesize,
* to allow even a single big packet to come.
*/
static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb)
static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb,
unsigned int limit)
{
unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);
return qsize > sk->sk_rcvbuf;
return qsize > limit;
}
/* The per-socket spinlock must be held here. */
static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb)
static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb,
unsigned int limit)
{
if (sk_rcvqueues_full(sk, skb))
if (sk_rcvqueues_full(sk, skb, limit))
return -ENOBUFS;
__sk_add_backlog(sk, skb);

4
net/core/sock.c
View File

@ -389,7 +389,7 @@ int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
skb->dev = NULL;
if (sk_rcvqueues_full(sk, skb)) {
if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
atomic_inc(&sk->sk_drops);
goto discard_and_relse;
}
@ -406,7 +406,7 @@ int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
rc = sk_backlog_rcv(sk, skb);
mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
} else if (sk_add_backlog(sk, skb)) {
} else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
bh_unlock_sock(sk);
atomic_inc(&sk->sk_drops);
goto discard_and_relse;

2
net/ipv4/tcp_ipv4.c
View File

@ -1752,7 +1752,7 @@ process:
if (!tcp_prequeue(sk, skb))
ret = tcp_v4_do_rcv(sk, skb);
}
} else if (unlikely(sk_add_backlog(sk, skb))) {
} else if (unlikely(sk_add_backlog(sk, skb, sk->sk_rcvbuf))) {
bh_unlock_sock(sk);
NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
goto discard_and_relse;

4
net/ipv4/udp.c
View File

@ -1479,7 +1479,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
goto drop;
if (sk_rcvqueues_full(sk, skb))
if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
goto drop;
rc = 0;
@ -1488,7 +1488,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
bh_lock_sock(sk);
if (!sock_owned_by_user(sk))
rc = __udp_queue_rcv_skb(sk, skb);
else if (sk_add_backlog(sk, skb)) {
else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
bh_unlock_sock(sk);
goto drop;
}

2
net/ipv6/tcp_ipv6.c
View File

@ -1654,7 +1654,7 @@ process:
if (!tcp_prequeue(sk, skb))
ret = tcp_v6_do_rcv(sk, skb);
}
} else if (unlikely(sk_add_backlog(sk, skb))) {
} else if (unlikely(sk_add_backlog(sk, skb, sk->sk_rcvbuf))) {
bh_unlock_sock(sk);
NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
goto discard_and_relse;

8
net/ipv6/udp.c
View File

@ -611,14 +611,14 @@ static void flush_stack(struct sock **stack, unsigned int count,
sk = stack[i];
if (skb1) {
if (sk_rcvqueues_full(sk, skb1)) {
if (sk_rcvqueues_full(sk, skb1, sk->sk_rcvbuf)) {
kfree_skb(skb1);
goto drop;
}
bh_lock_sock(sk);
if (!sock_owned_by_user(sk))
udpv6_queue_rcv_skb(sk, skb1);
else if (sk_add_backlog(sk, skb1)) {
else if (sk_add_backlog(sk, skb1, sk->sk_rcvbuf)) {
kfree_skb(skb1);
bh_unlock_sock(sk);
goto drop;
@ -790,14 +790,14 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
/* deliver */
if (sk_rcvqueues_full(sk, skb)) {
if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
sock_put(sk);
goto discard;
}
bh_lock_sock(sk);
if (!sock_owned_by_user(sk))
udpv6_queue_rcv_skb(sk, skb);
else if (sk_add_backlog(sk, skb)) {
else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
atomic_inc(&sk->sk_drops);
bh_unlock_sock(sk);
sock_put(sk);

2
net/llc/llc_conn.c
View File

@ -828,7 +828,7 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
else {
dprintk("%s: adding to backlog...\n", __func__);
llc_set_backlog_type(skb, LLC_PACKET);
if (sk_add_backlog(sk, skb))
if (sk_add_backlog(sk, skb, sk->sk_rcvbuf))
goto drop_unlock;
}
out:

4
net/sctp/input.c
View File

@ -342,7 +342,7 @@ int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
sctp_bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
if (sk_add_backlog(sk, skb))
if (sk_add_backlog(sk, skb, sk->sk_rcvbuf))
sctp_chunk_free(chunk);
else
backloged = 1;
@ -376,7 +376,7 @@ static int sctp_add_backlog(struct sock *sk, struct sk_buff *skb)
struct sctp_ep_common *rcvr = chunk->rcvr;
int ret;
ret = sk_add_backlog(sk, skb);
ret = sk_add_backlog(sk, skb, sk->sk_rcvbuf);
if (!ret) {
/* Hold the assoc/ep while hanging on the backlog queue.
* This way, we know structures we need will not disappear

2
net/tipc/socket.c
View File

@ -1330,7 +1330,7 @@ static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
if (!sock_owned_by_user(sk)) {
res = filter_rcv(sk, buf);
} else {
if (sk_add_backlog(sk, buf))
if (sk_add_backlog(sk, buf, sk->sk_rcvbuf))
res = TIPC_ERR_OVERLOAD;
else
res = TIPC_OK;

2
net/x25/x25_dev.c
View File

@ -58,7 +58,7 @@ static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb)
if (!sock_owned_by_user(sk)) {
queued = x25_process_rx_frame(sk, skb);
} else {
queued = !sk_add_backlog(sk, skb);
queued = !sk_add_backlog(sk, skb, sk->sk_rcvbuf);
}
bh_unlock_sock(sk);
sock_put(sk);