提交 94014e8d 编写于 作者: X Xin Long 提交者: David S. Miller

sctp: implement renege_events for sctp_stream_interleave

renege_events is added as a member of sctp_stream_interleave, used to
renege some old data or idata in reasm or lobby queue properly to free
some memory for the new data when there's memory stress.

It defines sctp_renege_events for idata, and leaves sctp_ulpq_renege
as it is for data.
Signed-off-by: NXin Long <lucien.xin@gmail.com>
Acked-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 9162e0ed
......@@ -43,6 +43,8 @@ struct sctp_stream_interleave {
struct sctp_chunk *chunk, gfp_t gfp);
int (*enqueue_event)(struct sctp_ulpq *ulpq,
struct sctp_ulpevent *event);
void (*renege_events)(struct sctp_ulpq *ulpq,
struct sctp_chunk *chunk, gfp_t gfp);
};
void sctp_stream_interleave_init(struct sctp_stream *stream);
......
......@@ -76,11 +76,8 @@ int sctp_clear_pd(struct sock *sk, struct sctp_association *asoc);
void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn);
void sctp_ulpq_reasm_flushtsn(struct sctp_ulpq *, __u32);
#endif /* __sctp_ulpqueue_h__ */
__u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
struct sk_buff_head *list, __u16 needed);
#endif /* __sctp_ulpqueue_h__ */
......@@ -1735,8 +1735,9 @@ static int sctp_cmd_interpreter(enum sctp_event event_type,
break;
case SCTP_CMD_RENEGE:
sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk,
GFP_ATOMIC);
asoc->stream.si->renege_events(&asoc->ulpq,
cmd->obj.chunk,
GFP_ATOMIC);
break;
case SCTP_CMD_SETUP_T4:
......
......@@ -545,6 +545,113 @@ static int sctp_ulpevent_idata(struct sctp_ulpq *ulpq,
return event_eor;
}
static struct sctp_ulpevent *sctp_intl_retrieve_first(struct sctp_ulpq *ulpq)
{
struct sctp_stream_in *csin, *sin = NULL;
struct sk_buff *first_frag = NULL;
struct sk_buff *last_frag = NULL;
struct sctp_ulpevent *retval;
struct sk_buff *pos;
__u32 next_fsn = 0;
__u16 sid = 0;
skb_queue_walk(&ulpq->reasm, pos) {
struct sctp_ulpevent *cevent = sctp_skb2event(pos);
csin = sctp_stream_in(ulpq->asoc, cevent->stream);
if (csin->pd_mode)
continue;
switch (cevent->msg_flags & SCTP_DATA_FRAG_MASK) {
case SCTP_DATA_FIRST_FRAG:
if (first_frag)
goto out;
if (cevent->mid == csin->mid) {
first_frag = pos;
last_frag = pos;
next_fsn = 0;
sin = csin;
sid = cevent->stream;
}
break;
case SCTP_DATA_MIDDLE_FRAG:
if (!first_frag)
break;
if (cevent->stream == sid &&
cevent->mid == sin->mid &&
cevent->fsn == next_fsn) {
next_fsn++;
last_frag = pos;
} else {
goto out;
}
break;
case SCTP_DATA_LAST_FRAG:
if (first_frag)
goto out;
break;
default:
break;
}
}
if (!first_frag)
return NULL;
out:
retval = sctp_make_reassembled_event(sock_net(ulpq->asoc->base.sk),
&ulpq->reasm, first_frag,
last_frag);
if (retval) {
sin->fsn = next_fsn;
sin->pd_mode = 1;
}
return retval;
}
static void sctp_intl_start_pd(struct sctp_ulpq *ulpq, gfp_t gfp)
{
struct sctp_ulpevent *event;
if (skb_queue_empty(&ulpq->reasm))
return;
do {
event = sctp_intl_retrieve_first(ulpq);
if (event)
sctp_enqueue_event(ulpq, event);
} while (event);
}
static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
gfp_t gfp)
{
struct sctp_association *asoc = ulpq->asoc;
__u32 freed = 0;
__u16 needed;
if (chunk) {
needed = ntohs(chunk->chunk_hdr->length);
needed -= sizeof(struct sctp_idata_chunk);
} else {
needed = SCTP_DEFAULT_MAXWINDOW;
}
if (skb_queue_empty(&asoc->base.sk->sk_receive_queue)) {
freed = sctp_ulpq_renege_list(ulpq, &ulpq->lobby, needed);
if (freed < needed)
freed += sctp_ulpq_renege_list(ulpq, &ulpq->reasm,
needed);
}
if (chunk && freed >= needed)
if (sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0)
sctp_intl_start_pd(ulpq, gfp);
sk_mem_reclaim(asoc->base.sk);
}
static struct sctp_stream_interleave sctp_stream_interleave_0 = {
.data_chunk_len = sizeof(struct sctp_data_chunk),
/* DATA process functions */
......@@ -553,6 +660,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_0 = {
.validate_data = sctp_validate_data,
.ulpevent_data = sctp_ulpq_tail_data,
.enqueue_event = sctp_ulpq_tail_event,
.renege_events = sctp_ulpq_renege,
};
static struct sctp_stream_interleave sctp_stream_interleave_1 = {
......@@ -563,6 +671,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_1 = {
.validate_data = sctp_validate_idata,
.ulpevent_data = sctp_ulpevent_idata,
.enqueue_event = sctp_enqueue_event,
.renege_events = sctp_renege_events,
};
void sctp_stream_interleave_init(struct sctp_stream *stream)
......
......@@ -978,8 +978,8 @@ void sctp_ulpq_skip(struct sctp_ulpq *ulpq, __u16 sid, __u16 ssn)
sctp_ulpq_reap_ordered(ulpq, sid);
}
static __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,
struct sk_buff_head *list, __u16 needed)
__u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq, struct sk_buff_head *list,
__u16 needed)
{
__u16 freed = 0;
__u32 tsn, last_tsn;
......
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