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Commit 3a3295bf authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'sctp-fix-sk_wmem_queued-and-use-it-to-check-for-writable-space' 



Xin Long says:

====================
sctp: fix sk_wmem_queued and use it to check for writable space

sctp doesn't count and use asoc sndbuf_used, sk sk_wmem_alloc and
sk_wmem_queued properly, which also causes some problem.

This patchset is to improve it.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 2d0f0ca2 cd305c74

include/net/sctp/constants.h

+0 −5
Original line number Diff line number Diff line
@@ -148,11 +148,6 @@ SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, enum sctp_event_primitive, primitive) 
#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA || \

			       a->chunk_hdr->type == SCTP_CID_I_DATA)



/* Calculate the actual data size in a data chunk */

#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end) - \

				    (unsigned long)(c->chunk_hdr) - \

				    sctp_datachk_len(&c->asoc->stream)))



/* Internal error codes */

enum sctp_ierror {

	SCTP_IERROR_NO_ERROR	        = 0,

net/sctp/outqueue.c

+2 −6
Original line number Diff line number Diff line
@@ -385,9 +385,7 @@ static int sctp_prsctp_prune_sent(struct sctp_association *asoc, 
			asoc->outqueue.outstanding_bytes -= sctp_data_size(chk);

		}



		msg_len -= SCTP_DATA_SNDSIZE(chk) +

			   sizeof(struct sk_buff) +

			   sizeof(struct sctp_chunk);

		msg_len -= chk->skb->truesize + sizeof(struct sctp_chunk);

		if (msg_len <= 0)

			break;

	}
@@ -421,9 +419,7 @@ static int sctp_prsctp_prune_unsent(struct sctp_association *asoc, 
			streamout->ext->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;

		}



		msg_len -= SCTP_DATA_SNDSIZE(chk) +

			   sizeof(struct sk_buff) +

			   sizeof(struct sctp_chunk);

		msg_len -= chk->skb->truesize + sizeof(struct sctp_chunk);

		sctp_chunk_free(chk);

		if (msg_len <= 0)

			break;

net/sctp/socket.c

+15 −44
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ 
#include <net/sctp/stream_sched.h>



/* Forward declarations for internal helper functions. */

static int sctp_writeable(struct sock *sk);

static bool sctp_writeable(struct sock *sk);

static void sctp_wfree(struct sk_buff *skb);

static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,

				size_t msg_len);
@@ -119,25 +119,10 @@ static void sctp_enter_memory_pressure(struct sock *sk) 
/* Get the sndbuf space available at the time on the association.  */

static inline int sctp_wspace(struct sctp_association *asoc)

{

	int amt;



	if (asoc->ep->sndbuf_policy)

		amt = asoc->sndbuf_used;

	else

		amt = sk_wmem_alloc_get(asoc->base.sk);

	struct sock *sk = asoc->base.sk;



	if (amt >= asoc->base.sk->sk_sndbuf) {

		if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)

			amt = 0;

		else {

			amt = sk_stream_wspace(asoc->base.sk);

			if (amt < 0)

				amt = 0;

		}

	} else {

		amt = asoc->base.sk->sk_sndbuf - amt;

	}

	return amt;

	return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used

				       : sk_stream_wspace(sk);

}



/* Increment the used sndbuf space count of the corresponding association by
@@ -166,12 +151,9 @@ static inline void sctp_set_owner_w(struct sctp_chunk *chunk) 
	/* Save the chunk pointer in skb for sctp_wfree to use later.  */

	skb_shinfo(chunk->skb)->destructor_arg = chunk;



	asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +

				sizeof(struct sk_buff) +

				sizeof(struct sctp_chunk);



	refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);

	sk->sk_wmem_queued += chunk->skb->truesize;

	asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);

	sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);

	sk_mem_charge(sk, chunk->skb->truesize);

}
@@ -1928,10 +1910,10 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc, 
		asoc->pmtu_pending = 0;

	}



	if (sctp_wspace(asoc) < msg_len)

	if (sctp_wspace(asoc) < (int)msg_len)

		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));



	if (!sctp_wspace(asoc)) {

	if (sctp_wspace(asoc) <= 0) {

		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);

		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);

		if (err)
@@ -8460,17 +8442,11 @@ static void sctp_wfree(struct sk_buff *skb) 
	struct sctp_association *asoc = chunk->asoc;

	struct sock *sk = asoc->base.sk;



	asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +

				sizeof(struct sk_buff) +

				sizeof(struct sctp_chunk);



	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));



	/*

	 * This undoes what is done via sctp_set_owner_w and sk_mem_charge

	 */

	sk->sk_wmem_queued   -= skb->truesize;

	sk_mem_uncharge(sk, skb->truesize);

	sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);

	asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);

	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),

				      &sk->sk_wmem_alloc));



	if (chunk->shkey) {

		struct sctp_shared_key *shkey = chunk->shkey;
@@ -8544,7 +8520,7 @@ static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p, 
			goto do_error;

		if (signal_pending(current))

			goto do_interrupted;

		if (msg_len <= sctp_wspace(asoc))

		if ((int)msg_len <= sctp_wspace(asoc))

			break;



		/* Let another process have a go.  Since we are going
@@ -8619,14 +8595,9 @@ void sctp_write_space(struct sock *sk) 
 * UDP-style sockets or TCP-style sockets, this code should work.

 *  - Daisy

 */

static int sctp_writeable(struct sock *sk)

static bool sctp_writeable(struct sock *sk)

{

	int amt = 0;



	amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);

	if (amt < 0)

		amt = 0;

	return amt;

	return sk->sk_sndbuf > sk->sk_wmem_queued;

}



/* Wait for an association to go into ESTABLISHED state. If timeout is 0,