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netem: revised correlated loss generator

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This is a patch originated with Stefano Salsano and Fabio Ludovici.
It provides several alternative loss models for use with netem.
This patch adds two state machine based loss models.

See: http://netgroup.uniroma2.it/twiki/bin/view.cgi/Main/NetemCLG

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger
2011-02-23 13:04:21 +00:00
committed by David S. Miller
parent 10f6dfcfde
commit 661b79725f
2 changed files with 296 additions and 4 deletions
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26
include/linux/pkt_sched.h
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@@ -464,6 +464,7 @@ enum {
TCA_NETEM_DELAY_DIST,
TCA_NETEM_REORDER,
TCA_NETEM_CORRUPT,
TCA_NETEM_LOSS,
__TCA_NETEM_MAX,
};
@@ -494,6 +495,31 @@ struct tc_netem_corrupt {
__u32 correlation;
};
enum {
NETEM_LOSS_UNSPEC,
NETEM_LOSS_GI, /* General Intuitive - 4 state model */
NETEM_LOSS_GE, /* Gilbert Elliot models */
__NETEM_LOSS_MAX
};
#define NETEM_LOSS_MAX (__NETEM_LOSS_MAX - 1)
/* State transition probablities for 4 state model */
struct tc_netem_gimodel {
__u32 p13;
__u32 p31;
__u32 p32;
__u32 p14;
__u32 p23;
};
/* Gilbert-Elliot models */
struct tc_netem_gemodel {
__u32 p;
__u32 r;
__u32 h;
__u32 k1;
};
#define NETEM_DIST_SCALE 8192
#define NETEM_DIST_MAX 16384