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Message-Id: <95a7cce7dfa7741bc99d052f99c4ab7e40782502.1526319083.git.marcelo.leitner@gmail.com>
Date: Mon, 14 May 2018 14:35:19 -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 2/3] sctp: add asoc and packet to sctp_flush_ctx
Pre-compute these so the compiler won't reload them (due to
no-strict-aliasing).
Changes since v2:
- Do not replace a return with a break in sctp_outq_flush_data
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
---
net/sctp/outqueue.c | 97 ++++++++++++++++++++++++-----------------------------
1 file changed, 44 insertions(+), 53 deletions(-)
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index db94a2513dd874149aa77c4936f68537e97f8855..68b7baea3feaacf6738a2346501b2ad673b67503 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -798,16 +798,17 @@ struct sctp_flush_ctx {
struct sctp_transport *transport;
/* These transports have chunks to send. */
struct list_head transport_list;
+ struct sctp_association *asoc;
+ /* Packet on the current transport above */
+ struct sctp_packet *packet;
gfp_t gfp;
};
/* transport: current transport */
-static bool sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
+static void sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
struct sctp_chunk *chunk)
{
struct sctp_transport *new_transport = chunk->transport;
- struct sctp_association *asoc = ctx->q->asoc;
- bool changed = false;
if (!new_transport) {
if (!sctp_chunk_is_data(chunk)) {
@@ -825,7 +826,7 @@ static bool sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
&ctx->transport->ipaddr))
new_transport = ctx->transport;
else
- new_transport = sctp_assoc_lookup_paddr(asoc,
+ new_transport = sctp_assoc_lookup_paddr(ctx->asoc,
&chunk->dest);
}
@@ -833,7 +834,7 @@ static bool sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
* use the current active path.
*/
if (!new_transport)
- new_transport = asoc->peer.active_path;
+ new_transport = ctx->asoc->peer.active_path;
} else {
__u8 type;
@@ -858,7 +859,7 @@ static bool sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
if (type != SCTP_CID_HEARTBEAT &&
type != SCTP_CID_HEARTBEAT_ACK &&
type != SCTP_CID_ASCONF_ACK)
- new_transport = asoc->peer.active_path;
+ new_transport = ctx->asoc->peer.active_path;
break;
default:
break;
@@ -867,27 +868,25 @@ static bool sctp_outq_select_transport(struct sctp_flush_ctx *ctx,
/* Are we switching transports? Take care of transport locks. */
if (new_transport != ctx->transport) {
- changed = true;
ctx->transport = new_transport;
+ ctx->packet = &ctx->transport->packet;
+
if (list_empty(&ctx->transport->send_ready))
list_add_tail(&ctx->transport->send_ready,
&ctx->transport_list);
- sctp_packet_config(&ctx->transport->packet, asoc->peer.i.init_tag,
- asoc->peer.ecn_capable);
+ sctp_packet_config(ctx->packet,
+ ctx->asoc->peer.i.init_tag,
+ ctx->asoc->peer.ecn_capable);
/* We've switched transports, so apply the
* Burst limit to the new transport.
*/
sctp_transport_burst_limited(ctx->transport);
}
-
- return changed;
}
static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
{
- 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;
@@ -901,7 +900,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
* NOT use the new IP address as a source for ANY SCTP
* packet except on carrying an ASCONF Chunk.
*/
- if (asoc->src_out_of_asoc_ok &&
+ if (ctx->asoc->src_out_of_asoc_ok &&
chunk->chunk_hdr->type != SCTP_CID_ASCONF)
continue;
@@ -910,8 +909,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
/* 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(ctx, chunk))
- packet = &ctx->transport->packet;
+ sctp_outq_select_transport(ctx, chunk);
switch (chunk->chunk_hdr->type) {
/*
@@ -926,14 +924,14 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
error = sctp_packet_singleton(ctx->transport, chunk,
ctx->gfp);
if (error < 0) {
- asoc->base.sk->sk_err = -error;
+ ctx->asoc->base.sk->sk_err = -error;
return;
}
break;
case SCTP_CID_ABORT:
if (sctp_test_T_bit(chunk))
- packet->vtag = asoc->c.my_vtag;
+ ctx->packet->vtag = ctx->asoc->c.my_vtag;
/* fallthru */
/* The following chunks are "response" chunks, i.e.
@@ -959,7 +957,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
case SCTP_CID_FWD_TSN:
case SCTP_CID_I_FWD_TSN:
case SCTP_CID_RECONF:
- status = sctp_packet_transmit_chunk(packet, chunk,
+ status = sctp_packet_transmit_chunk(ctx->packet, chunk,
one_packet, ctx->gfp);
if (status != SCTP_XMIT_OK) {
/* put the chunk back */
@@ -967,7 +965,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
break;
}
- asoc->stats.octrlchunks++;
+ ctx->asoc->stats.octrlchunks++;
/* PR-SCTP C5) If a FORWARD TSN is sent, the
* sender MUST assure that at least one T3-rtx
* timer is running.
@@ -978,7 +976,7 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
ctx->transport->last_time_sent = jiffies;
}
- if (chunk == asoc->strreset_chunk)
+ if (chunk == ctx->asoc->strreset_chunk)
sctp_transport_reset_reconf_timer(ctx->transport);
break;
@@ -994,31 +992,28 @@ static void sctp_outq_flush_ctrl(struct sctp_flush_ctx *ctx)
static bool sctp_outq_flush_rtx(struct sctp_flush_ctx *ctx,
int rtx_timeout)
{
- 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)
+ if (ctx->asoc->peer.retran_path->state == SCTP_UNCONFIRMED)
return false;
- if (ctx->transport != asoc->peer.retran_path) {
+ if (ctx->transport != ctx->asoc->peer.retran_path) {
/* Switch transports & prepare the packet. */
- ctx->transport = asoc->peer.retran_path;
+ ctx->transport = ctx->asoc->peer.retran_path;
+ ctx->packet = &ctx->transport->packet;
if (list_empty(&ctx->transport->send_ready))
list_add_tail(&ctx->transport->send_ready,
&ctx->transport_list);
- packet = &ctx->transport->packet;
- sctp_packet_config(packet, asoc->peer.i.init_tag,
- asoc->peer.ecn_capable);
+ sctp_packet_config(ctx->packet, ctx->asoc->peer.i.init_tag,
+ ctx->asoc->peer.ecn_capable);
}
- error = __sctp_outq_flush_rtx(ctx->q, packet, rtx_timeout, &start_timer,
- ctx->gfp);
+ error = __sctp_outq_flush_rtx(ctx->q, ctx->packet, rtx_timeout,
+ &start_timer, ctx->gfp);
if (error < 0)
- asoc->base.sk->sk_err = -error;
+ ctx->asoc->base.sk->sk_err = -error;
if (start_timer) {
sctp_transport_reset_t3_rtx(ctx->transport);
@@ -1028,7 +1023,7 @@ static bool sctp_outq_flush_rtx(struct sctp_flush_ctx *ctx,
/* This can happen on COOKIE-ECHO resend. Only
* one chunk can get bundled with a COOKIE-ECHO.
*/
- if (packet->has_cookie_echo)
+ if (ctx->packet->has_cookie_echo)
return false;
/* Don't send new data if there is still data
@@ -1043,19 +1038,16 @@ static bool sctp_outq_flush_rtx(struct sctp_flush_ctx *ctx,
static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
int rtx_timeout)
{
- 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;
/* Is it OK to send data chunks? */
- switch (asoc->state) {
+ switch (ctx->asoc->state) {
case SCTP_STATE_COOKIE_ECHOED:
/* Only allow bundling when this packet has a COOKIE-ECHO
* chunk.
*/
- if (!packet || !packet->has_cookie_echo)
+ if (!ctx->packet || !ctx->packet->has_cookie_echo)
return;
/* fallthru */
@@ -1078,12 +1070,9 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
* are marked for retransmission (limited by the
* current cwnd).
*/
- if (!list_empty(&ctx->q->retransmit)) {
- if (!sctp_outq_flush_rtx(ctx, rtx_timeout))
- return;
- /* We may have switched current transport */
- packet = &ctx->transport->packet;
- }
+ if (!list_empty(&ctx->q->retransmit) &&
+ !sctp_outq_flush_rtx(ctx, rtx_timeout))
+ return;
/* Apply Max.Burst limitation to the current transport in
* case it will be used for new data. We are going to
@@ -1105,13 +1094,12 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
continue;
}
- if (asoc->stream.out[sid].state == SCTP_STREAM_CLOSED) {
+ if (ctx->asoc->stream.out[sid].state == SCTP_STREAM_CLOSED) {
sctp_outq_head_data(ctx->q, chunk);
break;
}
- if (sctp_outq_select_transport(ctx, chunk))
- packet = &ctx->transport->packet;
+ sctp_outq_select_transport(ctx, chunk);
pr_debug("%s: outq:%p, chunk:%p[%s], tx-tsn:0x%x skb->head:%p "
"skb->users:%d\n",
@@ -1122,7 +1110,8 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
refcount_read(&chunk->skb->users) : -1);
/* Add the chunk to the packet. */
- status = sctp_packet_transmit_chunk(packet, chunk, 0, ctx->gfp);
+ status = sctp_packet_transmit_chunk(ctx->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.
@@ -1139,12 +1128,12 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
* The sender MAY set the I-bit in the DATA
* chunk header.
*/
- if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING)
+ if (ctx->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++;
+ ctx->asoc->stats.ouodchunks++;
else
- asoc->stats.oodchunks++;
+ ctx->asoc->stats.oodchunks++;
/* Only now it's safe to consider this
* chunk as sent, sched-wise.
@@ -1160,7 +1149,7 @@ static void sctp_outq_flush_data(struct sctp_flush_ctx *ctx,
/* Only let one DATA chunk get bundled with a
* COOKIE-ECHO chunk.
*/
- if (packet->has_cookie_echo)
+ if (ctx->packet->has_cookie_echo)
break;
}
}
@@ -1202,6 +1191,8 @@ static void sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
.q = q,
.transport = NULL,
.transport_list = LIST_HEAD_INIT(ctx.transport_list),
+ .asoc = q->asoc,
+ .packet = NULL,
.gfp = gfp,
};
--
2.14.3
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