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Date: Mon, 14 May 2018 14:34:40 -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>,
Xin Long <lucien.xin@...il.com>,
Vlad Yasevich <vyasevich@...il.com>
Subject: [PATCH net-next v3 5/8] sctp: move flushing of data chunks out of sctp_outq_flush
To the new sctp_outq_flush_data. Again, smaller functions and with well
defined objectives.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
net/sctp/outqueue.c | 149 ++++++++++++++++++++++++++--------------------------
1 file changed, 75 insertions(+), 74 deletions(-)
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 49e80bf2ade73914f3be275016df0a6e7f06f606..bfa2e43dfd31d115862b65d1650858fcaa6f203b 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1038,46 +1038,17 @@ static bool sctp_outq_flush_rtx(struct sctp_outq *q,
return true;
}
-/*
- * Try to flush an outqueue.
- *
- * Description: Send everything in q which we legally can, subject to
- * congestion limitations.
- * * Note: This function can be called from multiple contexts so appropriate
- * locking concerns must be made. Today we use the sock lock to protect
- * this function.
- */
-static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
+
+static void sctp_outq_flush_data(struct sctp_outq *q,
+ struct sctp_transport **_transport,
+ struct list_head *transport_list,
+ int rtx_timeout, gfp_t gfp)
{
- struct sctp_packet *packet;
+ struct sctp_transport *transport = *_transport;
+ struct sctp_packet *packet = transport ? &transport->packet : NULL;
struct sctp_association *asoc = q->asoc;
- struct sctp_transport *transport = NULL;
struct sctp_chunk *chunk;
enum sctp_xmit status;
- int error = 0;
-
- /* These transports have chunks to send. */
- struct list_head transport_list;
- struct list_head *ltransport;
-
- INIT_LIST_HEAD(&transport_list);
- packet = NULL;
-
- /*
- * 6.10 Bundling
- * ...
- * When bundling control chunks with DATA chunks, an
- * endpoint MUST place control chunks first in the outbound
- * SCTP packet. The transmitter MUST transmit DATA chunks
- * within a SCTP packet in increasing order of TSN.
- * ...
- */
-
- sctp_outq_flush_ctrl(q, &transport, &transport_list, gfp);
- packet = &transport->packet;
-
- if (q->asoc->src_out_of_asoc_ok)
- goto sctp_flush_out;
/* Is it OK to send data chunks? */
switch (asoc->state) {
@@ -1102,10 +1073,11 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
* current cwnd).
*/
if (!list_empty(&q->retransmit)) {
- if (!sctp_outq_flush_rtx(q, &transport, &transport_list,
+ if (!sctp_outq_flush_rtx(q, _transport, transport_list,
rtx_timeout))
break;
/* We may have switched current transport */
+ transport = *_transport;
packet = &transport->packet;
}
@@ -1131,12 +1103,14 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
if (asoc->stream.out[sid].state == SCTP_STREAM_CLOSED) {
sctp_outq_head_data(q, chunk);
- goto sctp_flush_out;
+ break;
}
- if (sctp_outq_select_transport(chunk, asoc, &transport,
- &transport_list))
+ if (sctp_outq_select_transport(chunk, asoc, _transport,
+ transport_list)) {
+ transport = *_transport;
packet = &transport->packet;
+ }
pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p "
"skb->users:%d\n",
@@ -1148,8 +1122,10 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
/* Add the chunk to the packet. */
status = sctp_packet_transmit_chunk(packet, chunk, 0, gfp);
-
switch (status) {
+ case SCTP_XMIT_OK:
+ break;
+
case SCTP_XMIT_PMTU_FULL:
case SCTP_XMIT_RWND_FULL:
case SCTP_XMIT_DELAY:
@@ -1161,41 +1137,25 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
status);
sctp_outq_head_data(q, chunk);
- goto sctp_flush_out;
-
- case SCTP_XMIT_OK:
- /* The sender is in the SHUTDOWN-PENDING state,
- * The sender MAY set the I-bit in the DATA
- * chunk header.
- */
- if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING)
- chunk->chunk_hdr->flags |= SCTP_DATA_SACK_IMM;
- if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
- asoc->stats.ouodchunks++;
- else
- asoc->stats.oodchunks++;
-
- /* Only now it's safe to consider this
- * chunk as sent, sched-wise.
- */
- sctp_sched_dequeue_done(q, chunk);
-
- break;
-
- default:
- BUG();
+ return;
}
- /* BUG: We assume that the sctp_packet_transmit()
- * call below will succeed all the time and add the
- * chunk to the transmitted list and restart the
- * timers.
- * It is possible that the call can fail under OOM
- * conditions.
- *
- * Is this really a problem? Won't this behave
- * like a lost TSN?
+ /* The sender is in the SHUTDOWN-PENDING state,
+ * The sender MAY set the I-bit in the DATA
+ * chunk header.
*/
+ if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING)
+ chunk->chunk_hdr->flags |= SCTP_DATA_SACK_IMM;
+ if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
+ asoc->stats.ouodchunks++;
+ else
+ asoc->stats.oodchunks++;
+
+ /* Only now it's safe to consider this
+ * chunk as sent, sched-wise.
+ */
+ sctp_sched_dequeue_done(q, chunk);
+
list_add_tail(&chunk->transmitted_list,
&transport->transmitted);
@@ -1206,7 +1166,7 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
* COOKIE-ECHO chunk.
*/
if (packet->has_cookie_echo)
- goto sctp_flush_out;
+ break;
}
break;
@@ -1214,6 +1174,47 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
/* Do nothing. */
break;
}
+}
+
+/*
+ * Try to flush an outqueue.
+ *
+ * Description: Send everything in q which we legally can, subject to
+ * congestion limitations.
+ * * Note: This function can be called from multiple contexts so appropriate
+ * locking concerns must be made. Today we use the sock lock to protect
+ * this function.
+ */
+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;
+ struct sctp_transport *transport = NULL;
+ int error = 0;
+
+ /* These transports have chunks to send. */
+ struct list_head transport_list;
+ struct list_head *ltransport;
+
+ INIT_LIST_HEAD(&transport_list);
+ packet = NULL;
+
+ /*
+ * 6.10 Bundling
+ * ...
+ * When bundling control chunks with DATA chunks, an
+ * endpoint MUST place control chunks first in the outbound
+ * SCTP packet. The transmitter MUST transmit DATA chunks
+ * within a SCTP packet in increasing order of TSN.
+ * ...
+ */
+
+ sctp_outq_flush_ctrl(q, &transport, &transport_list, gfp);
+
+ if (q->asoc->src_out_of_asoc_ok)
+ goto sctp_flush_out;
+
+ sctp_outq_flush_data(q, &transport, &transport_list, rtx_timeout, gfp);
sctp_flush_out:
--
2.14.3
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