htb: add support for direct_qlen attribute
TCA_HTB_DIRECT_QLEN attribute is supported since linux-3.10
HTB classes use an internal pfifo queue, which limit was not reported
by tc, and value inherited from device tx_queue_len at setup time.
With this patch, tc displays the value and can change it.
Signed-off-by: Eric Dumazet <edumazet@google.com>
diff --git a/tc/q_htb.c b/tc/q_htb.c
index 7b6f908..6737ddb 100644
--- a/tc/q_htb.c
+++ b/tc/q_htb.c
@@ -31,9 +31,11 @@
static void explain(void)
{
fprintf(stderr, "Usage: ... qdisc add ... htb [default N] [r2q N]\n"
+ " [direct_qlen P]\n"
" default minor id of class to which unclassified packets are sent {0}\n"
" r2q DRR quantums are computed as rate in Bps/r2q {10}\n"
" debug string of 16 numbers each 0-3 {0}\n\n"
+ " direct_qlen Limit of the direct queue {in packets}\n"
"... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n"
" [prio P] [slot S] [pslot PS]\n"
" [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n"
@@ -108,6 +110,7 @@
unsigned mtu;
unsigned short mpu = 0;
unsigned short overhead = 0;
+ unsigned int direct_qlen = ~0U;
unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
struct rtattr *tail;
@@ -125,6 +128,11 @@
if (get_u32(&mtu, *argv, 10)) {
explain1("mtu"); return -1;
}
+ } else if (matches(*argv, "direct_qlen") == 0) {
+ NEXT_ARG();
+ if (get_u32(&direct_qlen, *argv, 10)) {
+ explain1("direct_qlen"); return -1;
+ }
} else if (matches(*argv, "mpu") == 0) {
NEXT_ARG();
if (get_u16(&mpu, *argv, 10)) {
@@ -230,6 +238,9 @@
opt.cbuffer = tc_calc_xmittime(opt.ceil.rate, cbuffer);
tail = NLMSG_TAIL(n);
+ if (direct_qlen != ~0U)
+ addattr_l(n, 1024, TCA_HTB_DIRECT_QLEN,
+ &direct_qlen, sizeof(direct_qlen));
addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt));
addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024);
@@ -240,7 +251,7 @@
static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
- struct rtattr *tb[TCA_HTB_RTAB+1];
+ struct rtattr *tb[TCA_HTB_MAX + 1];
struct tc_htb_opt *hopt;
struct tc_htb_glob *gopt;
double buffer,cbuffer;
@@ -253,7 +264,7 @@
if (opt == NULL)
return 0;
- parse_rtattr_nested(tb, TCA_HTB_RTAB, opt);
+ parse_rtattr_nested(tb, TCA_HTB_MAX, opt);
if (tb[TCA_HTB_PARMS]) {
hopt = RTA_DATA(tb[TCA_HTB_PARMS]);
@@ -302,6 +313,12 @@
if (show_details)
fprintf(f," ver %d.%d",gopt->version >> 16,gopt->version & 0xffff);
}
+ if (tb[TCA_HTB_DIRECT_QLEN] &&
+ RTA_PAYLOAD(tb[TCA_HTB_DIRECT_QLEN]) >= sizeof(__u32)) {
+ __u32 direct_qlen = rta_getattr_u32(tb[TCA_HTB_DIRECT_QLEN]);
+
+ fprintf(f, " direct_qlen %u", direct_qlen);
+ }
return 0;
}
