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Date: Fri, 9 May 2008 15:16:04 -0400
From: Vlad Yasevich <vladislav.yasevich@...com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, linux-sctp@...r.kernel.org,
lksctp-developers@...ts.sourceforge.net,
Wei Yongjun <yjwei@...fujitsu.com>,
Vlad Yasevich <vladislav.yasevich@...com>
Subject: [PATCH next-2.6 1/3] [SCTP]: Bring SCTP_DELAYED_ACK socket option into API compliance
From: Wei Yongjun <yjwei@...fujitsu.com>
Brings delayed_ack socket option set/get into line with the latest ietf
socket extensions API draft, while maintaining backwards compatibility.
Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>
---
include/net/sctp/structs.h | 4 +
include/net/sctp/user.h | 28 ++++--
net/sctp/associola.c | 3 +
net/sctp/sm_sideeffect.c | 17 +++-
net/sctp/socket.c | 242 ++++++++++++++++++++++++++++----------------
5 files changed, 194 insertions(+), 100 deletions(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 0ce0443..e111517 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -300,6 +300,7 @@ struct sctp_sock {
/* The default SACK delay timeout for new associations. */
__u32 sackdelay;
+ __u32 sackfreq;
/* Flags controlling Heartbeat, SACK delay, and Path MTU Discovery. */
__u32 param_flags;
@@ -938,6 +939,7 @@ struct sctp_transport {
/* SACK delay timeout */
unsigned long sackdelay;
+ __u32 sackfreq;
/* When was the last time (in jiffies) that we heard from this
* transport? We use this to pick new active and retran paths.
@@ -1542,6 +1544,7 @@ struct sctp_association {
* : SACK's are not delayed (see Section 6).
*/
__u8 sack_needed; /* Do we need to sack the peer? */
+ __u32 sack_cnt;
/* These are capabilities which our peer advertised. */
__u8 ecn_capable; /* Can peer do ECN? */
@@ -1651,6 +1654,7 @@ struct sctp_association {
/* SACK delay timeout */
unsigned long sackdelay;
+ __u32 sackfreq;
unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES];
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index 9619b9d..31371d2 100644
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -93,8 +93,9 @@ enum sctp_optname {
#define SCTP_STATUS SCTP_STATUS
SCTP_GET_PEER_ADDR_INFO,
#define SCTP_GET_PEER_ADDR_INFO SCTP_GET_PEER_ADDR_INFO
- SCTP_DELAYED_ACK_TIME,
-#define SCTP_DELAYED_ACK_TIME SCTP_DELAYED_ACK_TIME
+ SCTP_DELAYED_ACK,
+#define SCTP_DELAYED_ACK_TIME SCTP_DELAYED_ACK
+#define SCTP_DELAYED_ACK SCTP_DELAYED_ACK
SCTP_CONTEXT, /* Receive Context */
#define SCTP_CONTEXT SCTP_CONTEXT
SCTP_FRAGMENT_INTERLEAVE,
@@ -618,13 +619,26 @@ struct sctp_authkeyid {
};
-/* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
+/*
+ * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
*
- * This options will get or set the delayed ack timer. The time is set
- * in milliseconds. If the assoc_id is 0, then this sets or gets the
- * endpoints default delayed ack timer value. If the assoc_id field is
- * non-zero, then the set or get effects the specified association.
+ * This option will effect the way delayed acks are performed. This
+ * option allows you to get or set the delayed ack time, in
+ * milliseconds. It also allows changing the delayed ack frequency.
+ * Changing the frequency to 1 disables the delayed sack algorithm. If
+ * the assoc_id is 0, then this sets or gets the endpoints default
+ * values. If the assoc_id field is non-zero, then the set or get
+ * effects the specified association for the one to many model (the
+ * assoc_id field is ignored by the one to one model). Note that if
+ * sack_delay or sack_freq are 0 when setting this option, then the
+ * current values will remain unchanged.
*/
+struct sctp_sack_info {
+ sctp_assoc_t sack_assoc_id;
+ uint32_t sack_delay;
+ uint32_t sack_freq;
+};
+
struct sctp_assoc_value {
sctp_assoc_t assoc_id;
uint32_t assoc_value;
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index b4cd2b7..7b79d1e 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -136,6 +136,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
/* Set association default SACK delay */
asoc->sackdelay = msecs_to_jiffies(sp->sackdelay);
+ asoc->sackfreq = sp->sackfreq;
/* Set the association default flags controlling
* Heartbeat, SACK delay, and Path MTU Discovery.
@@ -261,6 +262,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
* already received one packet.]
*/
asoc->peer.sack_needed = 1;
+ asoc->peer.sack_cnt = 0;
/* Assume that the peer will tell us if he recognizes ASCONF
* as part of INIT exchange.
@@ -615,6 +617,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
* association configured value.
*/
peer->sackdelay = asoc->sackdelay;
+ peer->sackfreq = asoc->sackfreq;
/* Enable/disable heartbeat, SACK delay, and path MTU discovery
* based on association setting.
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 23a9f1a..b083312 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -190,20 +190,28 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
* unacknowledged DATA chunk. ...
*/
if (!asoc->peer.sack_needed) {
- /* We will need a SACK for the next packet. */
- asoc->peer.sack_needed = 1;
+ asoc->peer.sack_cnt++;
/* Set the SACK delay timeout based on the
* SACK delay for the last transport
* data was received from, or the default
* for the association.
*/
- if (trans)
+ if (trans) {
+ /* We will need a SACK for the next packet. */
+ if (asoc->peer.sack_cnt >= trans->sackfreq - 1)
+ asoc->peer.sack_needed = 1;
+
asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
trans->sackdelay;
- else
+ } else {
+ /* We will need a SACK for the next packet. */
+ if (asoc->peer.sack_cnt >= asoc->sackfreq - 1)
+ asoc->peer.sack_needed = 1;
+
asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
asoc->sackdelay;
+ }
/* Restart the SACK timer. */
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
@@ -216,6 +224,7 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
goto nomem;
asoc->peer.sack_needed = 0;
+ asoc->peer.sack_cnt = 0;
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack));
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e7e3baf..6698587 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2305,74 +2305,98 @@ static int sctp_setsockopt_peer_addr_params(struct sock *sk,
return 0;
}
-/* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
- *
- * This options will get or set the delayed ack timer. The time is set
- * in milliseconds. If the assoc_id is 0, then this sets or gets the
- * endpoints default delayed ack timer value. If the assoc_id field is
- * non-zero, then the set or get effects the specified association.
- *
- * struct sctp_assoc_value {
- * sctp_assoc_t assoc_id;
- * uint32_t assoc_value;
- * };
- *
- * assoc_id - This parameter, indicates which association the
- * user is preforming an action upon. Note that if
- * this field's value is zero then the endpoints
- * default value is changed (effecting future
- * associations only).
- *
- * assoc_value - This parameter contains the number of milliseconds
- * that the user is requesting the delayed ACK timer
- * be set to. Note that this value is defined in
- * the standard to be between 200 and 500 milliseconds.
- *
- * Note: a value of zero will leave the value alone,
- * but disable SACK delay. A non-zero value will also
- * enable SACK delay.
+/*
+ * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
+ *
+ * This option will effect the way delayed acks are performed. This
+ * option allows you to get or set the delayed ack time, in
+ * milliseconds. It also allows changing the delayed ack frequency.
+ * Changing the frequency to 1 disables the delayed sack algorithm. If
+ * the assoc_id is 0, then this sets or gets the endpoints default
+ * values. If the assoc_id field is non-zero, then the set or get
+ * effects the specified association for the one to many model (the
+ * assoc_id field is ignored by the one to one model). Note that if
+ * sack_delay or sack_freq are 0 when setting this option, then the
+ * current values will remain unchanged.
+ *
+ * struct sctp_sack_info {
+ * sctp_assoc_t sack_assoc_id;
+ * uint32_t sack_delay;
+ * uint32_t sack_freq;
+ * };
+ *
+ * sack_assoc_id - This parameter, indicates which association the user
+ * is performing an action upon. Note that if this field's value is
+ * zero then the endpoints default value is changed (effecting future
+ * associations only).
+ *
+ * sack_delay - This parameter contains the number of milliseconds that
+ * the user is requesting the delayed ACK timer be set to. Note that
+ * this value is defined in the standard to be between 200 and 500
+ * milliseconds.
+ *
+ * sack_freq - This parameter contains the number of packets that must
+ * be received before a sack is sent without waiting for the delay
+ * timer to expire. The default value for this is 2, setting this
+ * value to 1 will disable the delayed sack algorithm.
*/
-static int sctp_setsockopt_delayed_ack_time(struct sock *sk,
+static int sctp_setsockopt_delayed_ack(struct sock *sk,
char __user *optval, int optlen)
{
- struct sctp_assoc_value params;
+ struct sctp_sack_info params;
struct sctp_transport *trans = NULL;
struct sctp_association *asoc = NULL;
struct sctp_sock *sp = sctp_sk(sk);
- if (optlen != sizeof(struct sctp_assoc_value))
- return - EINVAL;
+ if (optlen == sizeof(struct sctp_sack_info)) {
+ if (copy_from_user(¶ms, optval, optlen))
+ return -EFAULT;
- if (copy_from_user(¶ms, optval, optlen))
- return -EFAULT;
+ if (params.sack_delay == 0 && params.sack_freq == 0)
+ return 0;
+ } else if (optlen == sizeof(struct sctp_assoc_value)) {
+ printk(KERN_WARNING "SCTP: Use of struct sctp_sack_info "
+ "in delayed_ack socket option deprecated\n");
+ printk(KERN_WARNING "SCTP: struct sctp_sack_info instead\n");
+ if (copy_from_user(¶ms, optval, optlen))
+ return -EFAULT;
+
+ if (params.sack_delay == 0)
+ params.sack_freq = 1;
+ else
+ params.sack_freq = 0;
+ } else
+ return - EINVAL;
/* Validate value parameter. */
- if (params.assoc_value > 500)
+ if (params.sack_delay > 500)
return -EINVAL;
- /* Get association, if assoc_id != 0 and the socket is a one
+ /* Get association, if sack_assoc_id != 0 and the socket is a one
* to many style socket, and an association was not found, then
* the id was invalid.
*/
- asoc = sctp_id2assoc(sk, params.assoc_id);
- if (!asoc && params.assoc_id && sctp_style(sk, UDP))
+ asoc = sctp_id2assoc(sk, params.sack_assoc_id);
+ if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
return -EINVAL;
- if (params.assoc_value) {
+ if (params.sack_delay) {
if (asoc) {
asoc->sackdelay =
- msecs_to_jiffies(params.assoc_value);
+ msecs_to_jiffies(params.sack_delay);
asoc->param_flags =
(asoc->param_flags & ~SPP_SACKDELAY) |
SPP_SACKDELAY_ENABLE;
} else {
- sp->sackdelay = params.assoc_value;
+ sp->sackdelay = params.sack_delay;
sp->param_flags =
(sp->param_flags & ~SPP_SACKDELAY) |
SPP_SACKDELAY_ENABLE;
}
- } else {
+ }
+
+ if (params.sack_freq == 1) {
if (asoc) {
asoc->param_flags =
(asoc->param_flags & ~SPP_SACKDELAY) |
@@ -2382,22 +2406,40 @@ static int sctp_setsockopt_delayed_ack_time(struct sock *sk,
(sp->param_flags & ~SPP_SACKDELAY) |
SPP_SACKDELAY_DISABLE;
}
+ } else if (params.sack_freq > 1) {
+ if (asoc) {
+ asoc->sackfreq = params.sack_freq;
+ asoc->param_flags =
+ (asoc->param_flags & ~SPP_SACKDELAY) |
+ SPP_SACKDELAY_ENABLE;
+ } else {
+ sp->sackfreq = params.sack_freq;
+ sp->param_flags =
+ (sp->param_flags & ~SPP_SACKDELAY) |
+ SPP_SACKDELAY_ENABLE;
+ }
}
/* If change is for association, also apply to each transport. */
if (asoc) {
list_for_each_entry(trans, &asoc->peer.transport_addr_list,
transports) {
- if (params.assoc_value) {
+ if (params.sack_delay) {
trans->sackdelay =
- msecs_to_jiffies(params.assoc_value);
+ msecs_to_jiffies(params.sack_delay);
trans->param_flags =
(trans->param_flags & ~SPP_SACKDELAY) |
SPP_SACKDELAY_ENABLE;
- } else {
+ }
+ if (params.sack_delay == 1) {
trans->param_flags =
(trans->param_flags & ~SPP_SACKDELAY) |
SPP_SACKDELAY_DISABLE;
+ } else if (params.sack_freq > 1) {
+ trans->sackfreq = params.sack_freq;
+ trans->param_flags =
+ (trans->param_flags & ~SPP_SACKDELAY) |
+ SPP_SACKDELAY_ENABLE;
}
}
}
@@ -3186,8 +3228,8 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
break;
- case SCTP_DELAYED_ACK_TIME:
- retval = sctp_setsockopt_delayed_ack_time(sk, optval, optlen);
+ case SCTP_DELAYED_ACK:
+ retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
break;
case SCTP_PARTIAL_DELIVERY_POINT:
retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
@@ -3446,6 +3488,7 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
sp->pathmaxrxt = sctp_max_retrans_path;
sp->pathmtu = 0; // allow default discovery
sp->sackdelay = sctp_sack_timeout;
+ sp->sackfreq = 3;
sp->param_flags = SPP_HB_ENABLE |
SPP_PMTUD_ENABLE |
SPP_SACKDELAY_ENABLE;
@@ -3999,70 +4042,91 @@ static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
return 0;
}
-/* 7.1.23. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
- *
- * This options will get or set the delayed ack timer. The time is set
- * in milliseconds. If the assoc_id is 0, then this sets or gets the
- * endpoints default delayed ack timer value. If the assoc_id field is
- * non-zero, then the set or get effects the specified association.
- *
- * struct sctp_assoc_value {
- * sctp_assoc_t assoc_id;
- * uint32_t assoc_value;
- * };
+/*
+ * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
+ *
+ * This option will effect the way delayed acks are performed. This
+ * option allows you to get or set the delayed ack time, in
+ * milliseconds. It also allows changing the delayed ack frequency.
+ * Changing the frequency to 1 disables the delayed sack algorithm. If
+ * the assoc_id is 0, then this sets or gets the endpoints default
+ * values. If the assoc_id field is non-zero, then the set or get
+ * effects the specified association for the one to many model (the
+ * assoc_id field is ignored by the one to one model). Note that if
+ * sack_delay or sack_freq are 0 when setting this option, then the
+ * current values will remain unchanged.
+ *
+ * struct sctp_sack_info {
+ * sctp_assoc_t sack_assoc_id;
+ * uint32_t sack_delay;
+ * uint32_t sack_freq;
+ * };
*
- * assoc_id - This parameter, indicates which association the
- * user is preforming an action upon. Note that if
- * this field's value is zero then the endpoints
- * default value is changed (effecting future
- * associations only).
+ * sack_assoc_id - This parameter, indicates which association the user
+ * is performing an action upon. Note that if this field's value is
+ * zero then the endpoints default value is changed (effecting future
+ * associations only).
*
- * assoc_value - This parameter contains the number of milliseconds
- * that the user is requesting the delayed ACK timer
- * be set to. Note that this value is defined in
- * the standard to be between 200 and 500 milliseconds.
+ * sack_delay - This parameter contains the number of milliseconds that
+ * the user is requesting the delayed ACK timer be set to. Note that
+ * this value is defined in the standard to be between 200 and 500
+ * milliseconds.
*
- * Note: a value of zero will leave the value alone,
- * but disable SACK delay. A non-zero value will also
- * enable SACK delay.
+ * sack_freq - This parameter contains the number of packets that must
+ * be received before a sack is sent without waiting for the delay
+ * timer to expire. The default value for this is 2, setting this
+ * value to 1 will disable the delayed sack algorithm.
*/
-static int sctp_getsockopt_delayed_ack_time(struct sock *sk, int len,
+static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
char __user *optval,
int __user *optlen)
{
- struct sctp_assoc_value params;
+ struct sctp_sack_info params;
struct sctp_association *asoc = NULL;
struct sctp_sock *sp = sctp_sk(sk);
- if (len < sizeof(struct sctp_assoc_value))
- return - EINVAL;
+ if (len >= sizeof(struct sctp_sack_info)) {
+ len = sizeof(struct sctp_sack_info);
- len = sizeof(struct sctp_assoc_value);
-
- if (copy_from_user(¶ms, optval, len))
- return -EFAULT;
+ if (copy_from_user(¶ms, optval, len))
+ return -EFAULT;
+ } else if (len == sizeof(struct sctp_assoc_value)) {
+ printk(KERN_WARNING "SCTP: Use of struct sctp_sack_info "
+ "in delayed_ack socket option deprecated\n");
+ printk(KERN_WARNING "SCTP: struct sctp_sack_info instead\n");
+ if (copy_from_user(¶ms, optval, len))
+ return -EFAULT;
+ } else
+ return - EINVAL;
- /* Get association, if assoc_id != 0 and the socket is a one
+ /* Get association, if sack_assoc_id != 0 and the socket is a one
* to many style socket, and an association was not found, then
* the id was invalid.
*/
- asoc = sctp_id2assoc(sk, params.assoc_id);
- if (!asoc && params.assoc_id && sctp_style(sk, UDP))
+ asoc = sctp_id2assoc(sk, params.sack_assoc_id);
+ if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
return -EINVAL;
if (asoc) {
/* Fetch association values. */
- if (asoc->param_flags & SPP_SACKDELAY_ENABLE)
- params.assoc_value = jiffies_to_msecs(
+ if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
+ params.sack_delay = jiffies_to_msecs(
asoc->sackdelay);
- else
- params.assoc_value = 0;
+ params.sack_freq = asoc->sackfreq;
+
+ } else {
+ params.sack_delay = 0;
+ params.sack_freq = 1;
+ }
} else {
/* Fetch socket values. */
- if (sp->param_flags & SPP_SACKDELAY_ENABLE)
- params.assoc_value = sp->sackdelay;
- else
- params.assoc_value = 0;
+ if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
+ params.sack_delay = sp->sackdelay;
+ params.sack_freq = sp->sackfreq;
+ } else {
+ params.sack_delay = 0;
+ params.sack_freq = 1;
+ }
}
if (copy_to_user(optval, ¶ms, len))
@@ -5218,8 +5282,8 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
optlen);
break;
- case SCTP_DELAYED_ACK_TIME:
- retval = sctp_getsockopt_delayed_ack_time(sk, len, optval,
+ case SCTP_DELAYED_ACK:
+ retval = sctp_getsockopt_delayed_ack(sk, len, optval,
optlen);
break;
case SCTP_INITMSG:
--
1.5.3.5
--
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