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net/sctp: Replace in/out stream arrays with flex_array

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This path replaces physically contiguous memory arrays
allocated using kmalloc_array() with flexible arrays.
This enables to avoid memory allocation failures on the
systems under a memory stress.

Signed-off-by: Oleg Babin <obabin@virtuozzo.com>
Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Konstantin Khorenko
2018-08-10 20:11:43 +03:00
committed by David S. Miller
parent 05364ca03c
commit 0d493b4d0b
2 changed files with 71 additions and 26 deletions
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9
include/net/sctp/structs.h
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@@ -57,6 +57,7 @@
#include <linux/atomic.h> /* This gets us atomic counters. */
#include <linux/skbuff.h> /* We need sk_buff_head. */
#include <linux/workqueue.h> /* We need tq_struct. */
#include <linux/flex_array.h> /* We need flex_array. */
#include <linux/sctp.h> /* We need sctp* header structs. */
#include <net/sctp/auth.h> /* We need auth specific structs */
#include <net/ip.h> /* For inet_skb_parm */
@@ -1438,8 +1439,8 @@ struct sctp_stream_in {
};
struct sctp_stream {
struct sctp_stream_out *out;
struct sctp_stream_in *in;
struct flex_array *out;
struct flex_array *in;
__u16 outcnt;
__u16 incnt;
/* Current stream being sent, if any */
@@ -1465,14 +1466,14 @@ static inline struct sctp_stream_out *sctp_stream_out(
const struct sctp_stream *stream,
__u16 sid)
{
return ((struct sctp_stream_out *)(stream->out)) + sid;
return flex_array_get(stream->out, sid);
}
static inline struct sctp_stream_in *sctp_stream_in(
const struct sctp_stream *stream,
__u16 sid)
{
return ((struct sctp_stream_in *)(stream->in)) + sid;
return flex_array_get(stream->in, sid);
}
#define SCTP_SO(s, i) sctp_stream_out((s), (i))