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sctp: Update SWS avaoidance receiver side algorithm
We currently send window update SACKs every time we free up 1 PMTU worth of data. That a lot more SACKs then necessary. Instead, we'll now send back the actuall window every time we send a sack, and do window-update SACKs when a fraction of the receive buffer has been opened. The fraction is controlled with a sysctl. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
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@ -308,6 +308,10 @@ enum { SCTP_MAX_GABS = 16 };
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#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
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#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
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#define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
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* rcvbuf, which is 1/8 of initial
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* window
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*/
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#define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
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* to which we will raise the P-MTU.
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*/
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@ -231,6 +231,11 @@ extern struct sctp_globals {
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/* Flag to indicate whether computing and verifying checksum
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* is disabled. */
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int checksum_disable;
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/* Threshold for rwnd update SACKS. Receive buffer shifted this many
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* bits is an indicator of when to send and window update SACK.
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*/
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int rwnd_update_shift;
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} sctp_globals;
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#define sctp_rto_initial (sctp_globals.rto_initial)
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@ -267,6 +272,7 @@ extern struct sctp_globals {
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#define sctp_prsctp_enable (sctp_globals.prsctp_enable)
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#define sctp_auth_enable (sctp_globals.auth_enable)
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#define sctp_checksum_disable (sctp_globals.checksum_disable)
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#define sctp_rwnd_upd_shift (sctp_globals.rwnd_update_shift)
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/* SCTP Socket type: UDP or TCP style. */
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typedef enum {
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@ -1383,8 +1383,9 @@ static inline int sctp_peer_needs_update(struct sctp_association *asoc)
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case SCTP_STATE_SHUTDOWN_RECEIVED:
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case SCTP_STATE_SHUTDOWN_SENT:
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if ((asoc->rwnd > asoc->a_rwnd) &&
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((asoc->rwnd - asoc->a_rwnd) >=
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min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pathmtu)))
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((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32,
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(asoc->base.sk->sk_rcvbuf >> sctp_rwnd_upd_shift),
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asoc->pathmtu)))
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return 1;
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break;
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default:
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@ -1258,6 +1258,9 @@ SCTP_STATIC __init int sctp_init(void)
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/* Set SCOPE policy to enabled */
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sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
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/* Set the default rwnd update threshold */
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sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
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sctp_sysctl_register();
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INIT_LIST_HEAD(&sctp_address_families);
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@ -217,8 +217,7 @@ static int sctp_gen_sack(struct sctp_association *asoc, int force,
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sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
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SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
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} else {
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if (asoc->a_rwnd > asoc->rwnd)
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asoc->a_rwnd = asoc->rwnd;
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asoc->a_rwnd = asoc->rwnd;
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sack = sctp_make_sack(asoc);
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if (!sack)
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goto nomem;
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@ -52,6 +52,7 @@ static int int_max = INT_MAX;
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static int sack_timer_min = 1;
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static int sack_timer_max = 500;
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static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
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static int rwnd_scale_max = 16;
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extern int sysctl_sctp_mem[3];
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extern int sysctl_sctp_rmem[3];
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@ -284,6 +285,18 @@ static ctl_table sctp_table[] = {
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.extra1 = &zero,
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.extra2 = &addr_scope_max,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "rwnd_update_shift",
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.data = &sctp_rwnd_upd_shift,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &one,
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.extra2 = &rwnd_scale_max,
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},
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{ .ctl_name = 0 }
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};
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