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Date: Sat, 12 May 2018 19:21:04 -0300
From: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To: netdev@...r.kernel.org
Cc: linux-sctp@...r.kernel.org, Neil Horman <nhorman@...driver.com>,
Vlad Yasevich <vyasevich@...il.com>,
Xin Long <lucien.xin@...il.com>
Subject: [PATCH net-next v2 4/8] sctp: move outq data rtx code out of sctp_outq_flush
This patch renames current sctp_outq_flush_rtx to __sctp_outq_flush_rtx
and create a new sctp_outq_flush_rtx, with the code that was on
sctp_outq_flush. Again, the idea is to have functions with small and
defined objectives.
Yes, there is an open-coded path selection in the now sctp_outq_flush_rtx.
That is kept as is for now because it may be very different when we
implement retransmission path selection algorithms for CMT-SCTP.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
net/sctp/outqueue.c | 101 ++++++++++++++++++++++++++++++----------------------
1 file changed, 58 insertions(+), 43 deletions(-)
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 800202c68cb89f1086ee7d3a4493dc752c8bf6ac..6d7ee372a9d6b8e68a759277830d5334ec992d47 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -601,14 +601,14 @@ void sctp_retransmit(struct sctp_outq *q, struct sctp_transport *transport,
/*
* Transmit DATA chunks on the retransmit queue. Upon return from
- * sctp_outq_flush_rtx() the packet 'pkt' may contain chunks which
+ * __sctp_outq_flush_rtx() the packet 'pkt' may contain chunks which
* need to be transmitted by the caller.
* We assume that pkt->transport has already been set.
*
* The return value is a normal kernel error return value.
*/
-static int sctp_outq_flush_rtx(struct sctp_outq *q, struct sctp_packet *pkt,
- int rtx_timeout, int *start_timer)
+static int __sctp_outq_flush_rtx(struct sctp_outq *q, struct sctp_packet *pkt,
+ int rtx_timeout, int *start_timer)
{
struct sctp_transport *transport = pkt->transport;
struct sctp_chunk *chunk, *chunk1;
@@ -987,6 +987,57 @@ static void sctp_outq_flush_ctrl(struct sctp_outq *q,
}
}
+/* Returns false if new data shouldn't be sent */
+static bool sctp_outq_flush_rtx(struct sctp_outq *q,
+ struct sctp_transport **_transport,
+ struct list_head *transport_list,
+ int rtx_timeout)
+{
+ struct sctp_transport *transport = *_transport;
+ struct sctp_packet *packet = transport ? &transport->packet : NULL;
+ struct sctp_association *asoc = q->asoc;
+ int error, start_timer = 0;
+
+ if (asoc->peer.retran_path->state == SCTP_UNCONFIRMED)
+ return false;
+
+ if (transport != asoc->peer.retran_path) {
+ /* Switch transports & prepare the packet. */
+ transport = asoc->peer.retran_path;
+ *_transport = transport;
+
+ if (list_empty(&transport->send_ready))
+ list_add_tail(&transport->send_ready,
+ transport_list);
+
+ packet = &transport->packet;
+ sctp_packet_config(packet, asoc->peer.i.init_tag,
+ asoc->peer.ecn_capable);
+ }
+
+ error = __sctp_outq_flush_rtx(q, packet, rtx_timeout, &start_timer);
+ if (error < 0)
+ asoc->base.sk->sk_err = -error;
+
+ if (start_timer) {
+ sctp_transport_reset_t3_rtx(transport);
+ transport->last_time_sent = jiffies;
+ }
+
+ /* This can happen on COOKIE-ECHO resend. Only
+ * one chunk can get bundled with a COOKIE-ECHO.
+ */
+ if (packet->has_cookie_echo)
+ return false;
+
+ /* Don't send new data if there is still data
+ * waiting to retransmit.
+ */
+ if (!list_empty(&q->retransmit))
+ return false;
+
+ return true;
+}
/*
* Try to flush an outqueue.
*
@@ -1000,12 +1051,10 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
{
struct sctp_packet *packet;
struct sctp_association *asoc = q->asoc;
- __u32 vtag = asoc->peer.i.init_tag;
struct sctp_transport *transport = NULL;
struct sctp_chunk *chunk;
enum sctp_xmit status;
int error = 0;
- int start_timer = 0;
/* These transports have chunks to send. */
struct list_head transport_list;
@@ -1052,45 +1101,11 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
* current cwnd).
*/
if (!list_empty(&q->retransmit)) {
- if (asoc->peer.retran_path->state == SCTP_UNCONFIRMED)
- goto sctp_flush_out;
- if (transport == asoc->peer.retran_path)
- goto retran;
-
- /* Switch transports & prepare the packet. */
-
- transport = asoc->peer.retran_path;
-
- if (list_empty(&transport->send_ready)) {
- list_add_tail(&transport->send_ready,
- &transport_list);
- }
-
+ if (!sctp_outq_flush_rtx(q, &transport, &transport_list,
+ rtx_timeout))
+ break;
+ /* We may have switched current transport */
packet = &transport->packet;
- sctp_packet_config(packet, vtag,
- asoc->peer.ecn_capable);
- retran:
- error = sctp_outq_flush_rtx(q, packet,
- rtx_timeout, &start_timer);
- if (error < 0)
- asoc->base.sk->sk_err = -error;
-
- if (start_timer) {
- sctp_transport_reset_t3_rtx(transport);
- transport->last_time_sent = jiffies;
- }
-
- /* This can happen on COOKIE-ECHO resend. Only
- * one chunk can get bundled with a COOKIE-ECHO.
- */
- if (packet->has_cookie_echo)
- goto sctp_flush_out;
-
- /* Don't send new data if there is still data
- * waiting to retransmit.
- */
- if (!list_empty(&q->retransmit))
- goto sctp_flush_out;
}
/* Apply Max.Burst limitation to the current transport in
--
2.14.3
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