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Date: Sat, 9 Jul 2016 19:47:45 +0800
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Vlad Yasevich <vyasevich@...il.com>, daniel@...earbox.net,
davem@...emloft.net
Subject: [PATCH net-next 6/6] sctp: implement prsctp PRIO policy
prsctp PRIO policy is a policy to abandon lower priority chunks when
asoc doesn't have enough snd buffer, so that the current chunk with
higher priority can be queued successfully.
Similar to TTL/RTX policy, we will set the priority of the chunk to
prsctp_param with sinfo->sinfo_timetolive in sctp_set_prsctp_policy().
So if PRIO policy is enabled, msg->expire_at won't work.
asoc->sent_cnt_removable will record how many chunks can be checked to
remove. If priority policy is enabled, when the chunk is queued into
the out_queue, we will increase sent_cnt_removable. When the chunk is
moved to abandon_queue or dequeue and free, we will decrease
sent_cnt_removable.
In sctp_sendmsg, we will check if there is enough snd buffer for current
msg and if sent_cnt_removable is not 0. Then try to abandon chunks in
sctp_prune_prsctp when sendmsg from the retransmit/transmited queue, and
free chunks from out_queue in right order until the abandon+free size >
msg_len - sctp_wfree. For the abandon size, we have to wait until it
sends FORWARD TSN, receives the sack and the chunks are really freed.
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/net/sctp/structs.h | 4 ++
net/sctp/chunk.c | 1 +
net/sctp/outqueue.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++
net/sctp/sm_make_chunk.c | 3 +-
net/sctp/socket.c | 3 ++
5 files changed, 109 insertions(+), 1 deletion(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 6bcda71..8626bdd 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1084,6 +1084,8 @@ void sctp_retransmit(struct sctp_outq *, struct sctp_transport *,
sctp_retransmit_reason_t);
void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8);
int sctp_outq_uncork(struct sctp_outq *, gfp_t gfp);
+void sctp_prsctp_prune(struct sctp_association *asoc,
+ struct sctp_sndrcvinfo *sinfo, int msg_len);
/* Uncork and flush an outqueue. */
static inline void sctp_outq_cork(struct sctp_outq *q)
{
@@ -1864,6 +1866,8 @@ struct sctp_association {
struct sctp_priv_assoc_stats stats;
+ int sent_cnt_removable;
+
__u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
__u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
};
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index b3692b5..a55e547 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -360,6 +360,7 @@ int sctp_chunk_abandoned(struct sctp_chunk *chunk)
chunk->asoc->abandoned_sent[SCTP_PR_INDEX(RTX)]++;
return 1;
}
+ /* PRIO policy is processed by sendmsg, not here */
return 0;
}
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 084718f..72e54a4 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -326,6 +326,9 @@ int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk, gfp_t gfp)
sctp_chunk_hold(chunk);
sctp_outq_tail_data(q, chunk);
+ if (chunk->asoc->prsctp_enable &&
+ SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
+ chunk->asoc->sent_cnt_removable++;
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
SCTP_INC_STATS(net, SCTP_MIB_OUTUNORDERCHUNKS);
else
@@ -372,6 +375,96 @@ static void sctp_insert_list(struct list_head *head, struct list_head *new)
list_add_tail(new, head);
}
+static int sctp_prsctp_prune_sent(struct sctp_association *asoc,
+ struct sctp_sndrcvinfo *sinfo,
+ struct list_head *queue, int msg_len)
+{
+ struct sctp_chunk *chk, *temp;
+
+ list_for_each_entry_safe(chk, temp, queue, transmitted_list) {
+ if (!SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
+ chk->prsctp_param <= sinfo->sinfo_timetolive)
+ continue;
+
+ list_del_init(&chk->transmitted_list);
+ sctp_insert_list(&asoc->outqueue.abandoned,
+ &chk->transmitted_list);
+
+ asoc->sent_cnt_removable--;
+ asoc->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
+
+ if (!chk->tsn_gap_acked) {
+ if (chk->transport)
+ chk->transport->flight_size -=
+ sctp_data_size(chk);
+ asoc->outqueue.outstanding_bytes -= sctp_data_size(chk);
+ }
+
+ msg_len -= SCTP_DATA_SNDSIZE(chk) +
+ sizeof(struct sk_buff) +
+ sizeof(struct sctp_chunk);
+ if (msg_len <= 0)
+ break;
+ }
+
+ return msg_len;
+}
+
+static int sctp_prsctp_prune_unsent(struct sctp_association *asoc,
+ struct sctp_sndrcvinfo *sinfo,
+ struct list_head *queue, int msg_len)
+{
+ struct sctp_chunk *chk, *temp;
+
+ list_for_each_entry_safe(chk, temp, queue, list) {
+ if (!SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
+ chk->prsctp_param <= sinfo->sinfo_timetolive)
+ continue;
+
+ list_del_init(&chk->list);
+ asoc->sent_cnt_removable--;
+ asoc->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;
+
+ msg_len -= SCTP_DATA_SNDSIZE(chk) +
+ sizeof(struct sk_buff) +
+ sizeof(struct sctp_chunk);
+ sctp_chunk_free(chk);
+ if (msg_len <= 0)
+ break;
+ }
+
+ return msg_len;
+}
+
+/* Abandon the chunks according their priorities */
+void sctp_prsctp_prune(struct sctp_association *asoc,
+ struct sctp_sndrcvinfo *sinfo, int msg_len)
+{
+ struct sctp_transport *transport;
+
+ if (!asoc->prsctp_enable || !asoc->sent_cnt_removable)
+ return;
+
+ msg_len = sctp_prsctp_prune_sent(asoc, sinfo,
+ &asoc->outqueue.retransmit,
+ msg_len);
+ if (msg_len <= 0)
+ return;
+
+ list_for_each_entry(transport, &asoc->peer.transport_addr_list,
+ transports) {
+ msg_len = sctp_prsctp_prune_sent(asoc, sinfo,
+ &transport->transmitted,
+ msg_len);
+ if (msg_len <= 0)
+ return;
+ }
+
+ sctp_prsctp_prune_unsent(asoc, sinfo,
+ &asoc->outqueue.out_chunk_list,
+ msg_len);
+}
+
/* Mark all the eligible packets on a transport for retransmission. */
void sctp_retransmit_mark(struct sctp_outq *q,
struct sctp_transport *transport,
@@ -962,6 +1055,9 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
/* Mark as failed send. */
sctp_chunk_fail(chunk, SCTP_ERROR_INV_STRM);
+ if (asoc->prsctp_enable &&
+ SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
+ asoc->sent_cnt_removable--;
sctp_chunk_free(chunk);
continue;
}
@@ -1251,6 +1347,9 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
tsn = ntohl(tchunk->subh.data_hdr->tsn);
if (TSN_lte(tsn, ctsn)) {
list_del_init(&tchunk->transmitted_list);
+ if (asoc->prsctp_enable &&
+ SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
+ asoc->sent_cnt_removable--;
sctp_chunk_free(tchunk);
}
}
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index cfde934..1c96f47 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -720,7 +720,8 @@ static void sctp_set_prsctp_policy(struct sctp_chunk *chunk,
if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags))
chunk->prsctp_param =
jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive);
- else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags))
+ else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags) ||
+ SCTP_PR_PRIO_ENABLED(sinfo->sinfo_flags))
chunk->prsctp_param = sinfo->sinfo_timetolive;
}
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 0861429..71c7dc5 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1914,6 +1914,9 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
goto out_free;
}
+ if (sctp_wspace(asoc) < msg_len)
+ sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
+
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
if (!sctp_wspace(asoc)) {
err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
--
2.1.0
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