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net: sctp: migrate most recently used transport to ktime 

Be more precise in transport path selection and use ktime
helpers instead of jiffies to compare and pick the better
primary and secondary recently used transports. This also
avoids any side-effects during a possible roll-over, and
could lead to better path decision-making.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-06-11 18:19:30 +02:00 committed by David S. Miller
parent b82e8f31ac
commit e575235fc6
4 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/sctp/structs.h
View File

@ -838,10 +838,10 @@ struct sctp_transport {
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.
/* When was the last time that we heard from this transport? We use
* this to pick new active and retran paths.
*/
unsigned long last_time_heard;
ktime_t last_time_heard;
/* Last time(in jiffies) when cwnd is reduced due to the congestion
* indication based on ECNE chunk.

8
net/sctp/associola.c
View File

@ -1036,7 +1036,7 @@ static void sctp_assoc_bh_rcv(struct work_struct *work)
}
if (chunk->transport)
chunk->transport->last_time_heard = jiffies;
chunk->transport->last_time_heard = ktime_get();
/* Run through the state machine. */
error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype,
@ -1283,11 +1283,13 @@ static void sctp_select_active_and_retran_path(struct sctp_association *asoc)
trans->state == SCTP_PF)
continue;
if (trans_pri == NULL ||
trans->last_time_heard > trans_pri->last_time_heard) {
ktime_after(trans->last_time_heard,
trans_pri->last_time_heard)) {
trans_sec = trans_pri;
trans_pri = trans;
} else if (trans_sec == NULL ||
trans->last_time_heard > trans_sec->last_time_heard) {
ktime_after(trans->last_time_heard,
trans_sec->last_time_heard)) {
trans_sec = trans;
}
}

2
net/sctp/endpointola.c
View File

@ -481,7 +481,7 @@ normal:
}
if (chunk->transport)
chunk->transport->last_time_heard = jiffies;
chunk->transport->last_time_heard = ktime_get();
error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state,
ep, asoc, chunk, GFP_ATOMIC);

2
net/sctp/transport.c
View File

@ -72,7 +72,7 @@ static struct sctp_transport *sctp_transport_init(struct net *net,
*/
peer->rto = msecs_to_jiffies(net->sctp.rto_initial);
peer->last_time_heard = jiffies;
peer->last_time_heard = ktime_get();
peer->last_time_ecne_reduced = jiffies;
peer->param_flags = SPP_HB_DISABLE |