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Message-Id: <fb735793dfc87838a87c2cdd08852e7b46465404.1526142994.git.marcelo.leitner@gmail.com>
Date: Sat, 12 May 2018 19:21:48 -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 1/3] sctp: add sctp_flush_ctx, a context struct on outq_flush routines
With this struct we avoid passing lots of variables around and taking care
of updating the current transport/packet.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
net/sctp/outqueue.c | 182 +++++++++++++++++++++++++---------------------------
1 file changed, 88 insertions(+), 94 deletions(-)
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index a9400cb0cc249affcf2bedfc7a070d9e48843d27..db94a2513dd874149aa77c4936f68537e97f8855 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -791,13 +791,22 @@ static int sctp_packet_singleton(struct sctp_transport *transport,
return sctp_packet_transmit(&singleton, gfp);
}
-static bool sctp_outq_select_transport(struct sctp_chunk *chunk,
- struct sctp_association *asoc,
- struct sctp_transport **transport,
- struct list_head *transport_list)
+/* Struct to hold the context during sctp outq flush */
+struct sctp_flush_ctx {
+ struct sctp_outq *q;
+ /* Current transport being used. It's NOT the same as curr active one */
+ struct sctp_transport *transport;
+ /* These transports have chunks to send. */
+ struct list_head transport_list;
+ gfp_t gfp;
+};
+
+/* transport: current transport */
+static bool sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
+ struct sctp_chunk *chunk)
{
struct sctp_transport *new_transport = chunk->transport;
- struct sctp_transport *curr = *transport;
+ struct sctp_association *asoc = ctx->q->asoc;
bool changed = false;
if (!new_transport) {
@@ -812,9 +821,9 @@ static bool sctp_outq_select_transport(struct sctp_chunk *chunk,
* after processing ASCONFs, we may have new
* transports created.
*/
- if (curr && sctp_cmp_addr_exact(&chunk->dest,
- &curr->ipaddr))
- new_transport = curr;
+ if (ctx->transport && sctp_cmp_addr_exact(&chunk->dest,
+ &ctx->transport->ipaddr))
+ new_transport = ctx->transport;
else
new_transport = sctp_assoc_lookup_paddr(asoc,
&chunk->dest);
@@ -857,37 +866,33 @@ static bool sctp_outq_select_transport(struct sctp_chunk *chunk,
}
/* Are we switching transports? Take care of transport locks. */
- if (new_transport != curr) {
+ if (new_transport != ctx->transport) {
changed = true;
- curr = new_transport;
- *transport = curr;
- if (list_empty(&curr->send_ready))
- list_add_tail(&curr->send_ready, transport_list);
+ ctx->transport = new_transport;
+ if (list_empty(&ctx->transport->send_ready))
+ list_add_tail(&ctx->transport->send_ready,
+ &ctx->transport_list);
- sctp_packet_config(&curr->packet, asoc->peer.i.init_tag,
+ sctp_packet_config(&ctx->transport->packet, asoc->peer.i.init_tag,
asoc->peer.ecn_capable);
/* We've switched transports, so apply the
* Burst limit to the new transport.
*/
- sctp_transport_burst_limited(curr);
+ sctp_transport_burst_limited(ctx->transport);
}
return changed;
}
-static void sctp_outq_flush_ctrl(struct sctp_outq *q,
- struct sctp_transport **_transport,
- struct list_head *transport_list,
- gfp_t gfp)
+static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
{
- struct sctp_transport *transport = *_transport;
- struct sctp_association *asoc = q->asoc;
+ struct sctp_association *asoc = ctx->q->asoc;
struct sctp_packet *packet = NULL;
struct sctp_chunk *chunk, *tmp;
enum sctp_xmit status;
int one_packet, error;
- list_for_each_entry_safe(chunk, tmp, &q->control_chunk_list, list) {
+ list_for_each_entry_safe(chunk, tmp, &ctx->q->control_chunk_list, list) {
one_packet = 0;
/* RFC 5061, 5.3
@@ -905,11 +910,8 @@ static void sctp_outq_flush_ctrl(struct sctp_outq *q,
/* Pick the right transport to use. Should always be true for
* the first chunk as we don't have a transport by then.
*/
- if (sctp_outq_select_transport(chunk, asoc, &transport,
- transport_list)) {
- transport = *_transport;
- packet = &transport->packet;
- }
+ if (sctp_outq_select_transport(ctx, chunk))
+ packet = &ctx->transport->packet;
switch (chunk->chunk_hdr->type) {
/*
@@ -921,7 +923,8 @@ static void sctp_outq_flush_ctrl(struct sctp_outq *q,
case SCTP_CID_INIT:
case SCTP_CID_INIT_ACK:
case SCTP_CID_SHUTDOWN_COMPLETE:
- error = sctp_packet_singleton(transport, chunk, gfp);
+ error = sctp_packet_singleton(ctx->transport, chunk,
+ ctx->gfp);
if (error < 0) {
asoc->base.sk->sk_err = -error;
return;
@@ -957,10 +960,10 @@ static void sctp_outq_flush_ctrl(struct sctp_outq *q,
case SCTP_CID_I_FWD_TSN:
case SCTP_CID_RECONF:
status = sctp_packet_transmit_chunk(packet, chunk,
- one_packet, gfp);
+ one_packet, ctx->gfp);
if (status != SCTP_XMIT_OK) {
/* put the chunk back */
- list_add(&chunk->list, &q->control_chunk_list);
+ list_add(&chunk->list, &ctx->q->control_chunk_list);
break;
}
@@ -971,12 +974,12 @@ static void sctp_outq_flush_ctrl(struct sctp_outq *q,
*/
if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN ||
chunk->chunk_hdr->type == SCTP_CID_I_FWD_TSN) {
- sctp_transport_reset_t3_rtx(transport);
- transport->last_time_sent = jiffies;
+ sctp_transport_reset_t3_rtx(ctx->transport);
+ ctx->transport->last_time_sent = jiffies;
}
if (chunk == asoc->strreset_chunk)
- sctp_transport_reset_reconf_timer(transport);
+ sctp_transport_reset_reconf_timer(ctx->transport);
break;
@@ -988,41 +991,38 @@ 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, gfp_t gfp)
+static bool sctp_outq_flush_rtx(struct sctp_flush_ctx *ctx,
+ int rtx_timeout)
{
- struct sctp_transport *transport = *_transport;
- struct sctp_packet *packet = transport ? &transport->packet : NULL;
- struct sctp_association *asoc = q->asoc;
+ struct sctp_packet *packet = ctx->transport ? &ctx->transport->packet :
+ NULL;
+ struct sctp_association *asoc = ctx->q->asoc;
int error, start_timer = 0;
if (asoc->peer.retran_path->state == SCTP_UNCONFIRMED)
return false;
- if (transport != asoc->peer.retran_path) {
+ if (ctx->transport != asoc->peer.retran_path) {
/* Switch transports & prepare the packet. */
- transport = asoc->peer.retran_path;
- *_transport = transport;
+ ctx->transport = asoc->peer.retran_path;
- if (list_empty(&transport->send_ready))
- list_add_tail(&transport->send_ready,
- transport_list);
+ if (list_empty(&ctx->transport->send_ready))
+ list_add_tail(&ctx->transport->send_ready,
+ &ctx->transport_list);
- packet = &transport->packet;
+ packet = &ctx->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,
- gfp);
+ error = __sctp_outq_flush_rtx(ctx->q, packet, rtx_timeout, &start_timer,
+ ctx->gfp);
if (error < 0)
asoc->base.sk->sk_err = -error;
if (start_timer) {
- sctp_transport_reset_t3_rtx(transport);
- transport->last_time_sent = jiffies;
+ sctp_transport_reset_t3_rtx(ctx->transport);
+ ctx->transport->last_time_sent = jiffies;
}
/* This can happen on COOKIE-ECHO resend. Only
@@ -1034,20 +1034,18 @@ static bool sctp_outq_flush_rtx(struct sctp_outq *q,
/* Don't send new data if there is still data
* waiting to retransmit.
*/
- if (!list_empty(&q->retransmit))
+ if (!list_empty(&ctx->q->retransmit))
return false;
return true;
}
-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)
+static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
+ int rtx_timeout)
{
- struct sctp_transport *transport = *_transport;
- struct sctp_packet *packet = transport ? &transport->packet : NULL;
- struct sctp_association *asoc = q->asoc;
+ struct sctp_packet *packet = ctx->transport ? &ctx->transport->packet :
+ NULL;
+ struct sctp_association *asoc = ctx->q->asoc;
struct sctp_chunk *chunk;
enum sctp_xmit status;
@@ -1080,13 +1078,11 @@ static void sctp_outq_flush_data(struct sctp_outq *q,
* are marked for retransmission (limited by the
* current cwnd).
*/
- if (!list_empty(&q->retransmit)) {
- if (!sctp_outq_flush_rtx(q, _transport, transport_list,
- rtx_timeout, gfp))
+ if (!list_empty(&ctx->q->retransmit)) {
+ if (!sctp_outq_flush_rtx(ctx, rtx_timeout))
return;
/* We may have switched current transport */
- transport = *_transport;
- packet = &transport->packet;
+ packet = &ctx->transport->packet;
}
/* Apply Max.Burst limitation to the current transport in
@@ -1094,42 +1090,39 @@ static void sctp_outq_flush_data(struct sctp_outq *q,
* rest it before we return, but we want to apply the limit
* to the currently queued data.
*/
- if (transport)
- sctp_transport_burst_limited(transport);
+ if (ctx->transport)
+ sctp_transport_burst_limited(ctx->transport);
/* Finally, transmit new packets. */
- while ((chunk = sctp_outq_dequeue_data(q)) != NULL) {
+ while ((chunk = sctp_outq_dequeue_data(ctx->q)) != NULL) {
__u32 sid = ntohs(chunk->subh.data_hdr->stream);
/* Has this chunk expired? */
if (sctp_chunk_abandoned(chunk)) {
- sctp_sched_dequeue_done(q, chunk);
+ sctp_sched_dequeue_done(ctx->q, chunk);
sctp_chunk_fail(chunk, 0);
sctp_chunk_free(chunk);
continue;
}
if (asoc->stream.out[sid].state == SCTP_STREAM_CLOSED) {
- sctp_outq_head_data(q, chunk);
+ sctp_outq_head_data(ctx->q, chunk);
break;
}
- if (sctp_outq_select_transport(chunk, asoc, _transport,
- transport_list)) {
- transport = *_transport;
- packet = &transport->packet;
- }
+ if (sctp_outq_select_transport(ctx, chunk))
+ packet = &ctx->transport->packet;
pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p "
"skb->users:%d\n",
- __func__, q, chunk, chunk && chunk->chunk_hdr ?
+ __func__, ctx->q, chunk, chunk && chunk->chunk_hdr ?
sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)) :
"illegal chunk", ntohl(chunk->subh.data_hdr->tsn),
chunk->skb ? chunk->skb->head : NULL, chunk->skb ?
refcount_read(&chunk->skb->users) : -1);
/* Add the chunk to the packet. */
- status = sctp_packet_transmit_chunk(packet, chunk, 0, gfp);
+ status = sctp_packet_transmit_chunk(packet, chunk, 0, ctx->gfp);
if (status != SCTP_XMIT_OK) {
/* We could not append this chunk, so put
* the chunk back on the output queue.
@@ -1138,7 +1131,7 @@ static void sctp_outq_flush_data(struct sctp_outq *q,
__func__, ntohl(chunk->subh.data_hdr->tsn),
status);
- sctp_outq_head_data(q, chunk);
+ sctp_outq_head_data(ctx->q, chunk);
break;
}
@@ -1156,13 +1149,13 @@ static void sctp_outq_flush_data(struct sctp_outq *q,
/* Only now it's safe to consider this
* chunk as sent, sched-wise.
*/
- sctp_sched_dequeue_done(q, chunk);
+ sctp_sched_dequeue_done(ctx->q, chunk);
list_add_tail(&chunk->transmitted_list,
- &transport->transmitted);
+ &ctx->transport->transmitted);
- sctp_transport_reset_t3_rtx(transport);
- transport->last_time_sent = jiffies;
+ sctp_transport_reset_t3_rtx(ctx->transport);
+ ctx->transport->last_time_sent = jiffies;
/* Only let one DATA chunk get bundled with a
* COOKIE-ECHO chunk.
@@ -1172,22 +1165,20 @@ static void sctp_outq_flush_data(struct sctp_outq *q,
}
}
-static void sctp_outq_flush_transports(struct sctp_outq *q,
- struct list_head *transport_list,
- gfp_t gfp)
+static void sctp_outq_flush_transports(struct sctp_flush_ctx *ctx)
{
struct list_head *ltransport;
struct sctp_packet *packet;
struct sctp_transport *t;
int error = 0;
- while ((ltransport = sctp_list_dequeue(transport_list)) != NULL) {
+ while ((ltransport = sctp_list_dequeue(&ctx->transport_list)) != NULL) {
t = list_entry(ltransport, struct sctp_transport, send_ready);
packet = &t->packet;
if (!sctp_packet_empty(packet)) {
- error = sctp_packet_transmit(packet, gfp);
+ error = sctp_packet_transmit(packet, ctx->gfp);
if (error < 0)
- q->asoc->base.sk->sk_err = -error;
+ ctx->q->asoc->base.sk->sk_err = -error;
}
/* Clear the burst limited state, if any */
@@ -1204,12 +1195,15 @@ static void sctp_outq_flush_transports(struct sctp_outq *q,
* 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)
{
- /* Current transport being used. It's NOT the same as curr active one */
- struct sctp_transport *transport = NULL;
- /* These transports have chunks to send. */
- LIST_HEAD(transport_list);
+ struct sctp_flush_ctx ctx = {
+ .q = q,
+ .transport = NULL,
+ .transport_list = LIST_HEAD_INIT(ctx.transport_list),
+ .gfp = gfp,
+ };
/*
* 6.10 Bundling
@@ -1221,16 +1215,16 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
* ...
*/
- sctp_outq_flush_ctrl(q, &transport, &transport_list, gfp);
+ sctp_outq_flush_ctrl(&ctx);
if (q->asoc->src_out_of_asoc_ok)
goto sctp_flush_out;
- sctp_outq_flush_data(q, &transport, &transport_list, rtx_timeout, gfp);
+ sctp_outq_flush_data(&ctx, rtx_timeout);
sctp_flush_out:
- sctp_outq_flush_transports(q, &transport_list, gfp);
+ sctp_outq_flush_transports(&ctx);
}
/* Update unack_data based on the incoming SACK chunk */
--
2.14.3
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