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tc: add new queue discipline: head drop fifo 

This adds the required changes to gain access to
the head drop classfull queuing discipline named
pfifo_head_drop. In difference to pfifo or pfifo_fast
this queuing discipline will drop the first packet
in the case of queue congestion. As a result the queue
contain always the freshest packets.

To replace the current a root queueing discipline
for eth0:
$ tc qdisc replace dev eth0 root pfifo_head_drop

And show statistics:
$ tc -s qdisc show dev eth0

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>
This commit is contained in:
Hagen Paul Pfeifer 2010-01-24 12:31:05 +00:00 committed by Stephen Hemminger
parent 7cd96eee69
commit f703129d34
1 changed files with 7 additions and 1 deletions
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8
tc/q_fifo.c
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@ -25,7 +25,7 @@
static void explain(void) static void explain(void)
{ {
fprintf(stderr, "Usage: ... [p|b]fifo [ limit NUMBER ]\n"); fprintf(stderr, "Usage: ... <[p|b]fifo | pfifo_head_drop> [ limit NUMBER ]\n");
} }
static int fifo_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) static int fifo_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
@ -89,6 +89,12 @@ struct qdisc_util pfifo_qdisc_util = {
.print_qopt = fifo_print_opt, .print_qopt = fifo_print_opt,
}; };
struct qdisc_util pfifo_head_drop_qdisc_util = {
.id = "pfifo_head_drop",
.parse_qopt = fifo_parse_opt,
.print_qopt = fifo_print_opt,
};
extern int prio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt); extern int prio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt);
struct qdisc_util pfifo_fast_qdisc_util = { struct qdisc_util pfifo_fast_qdisc_util = {
.id = "pfifo_fast", .id = "pfifo_fast",