htb: add HTB_DIRECT_QLEN attribute

HTB uses an internal pfifo queue, which limit is not reported
to userland tools (tc), and value inherited from device tx_queue_len
at setup time.

Introduce TCA_HTB_DIRECT_QLEN attribute to allow finer control.

Remove two obsolete pr_err() calls as well.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index 32aef0a..dbd71b0 100644 (file)
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -348,6 +348,7 @@ enum {
        TCA_HTB_INIT,
        TCA_HTB_CTAB,
        TCA_HTB_RTAB,
+       TCA_HTB_DIRECT_QLEN,
        __TCA_HTB_MAX,
 };
 

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 571f1d2..79b1876 100644 (file)
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -981,6 +981,7 @@ static const struct nla_policy htb_policy[TCA_HTB_MAX + 1] = {
        [TCA_HTB_INIT]  = { .len = sizeof(struct tc_htb_glob) },
        [TCA_HTB_CTAB]  = { .type = NLA_BINARY, .len = TC_RTAB_SIZE },
        [TCA_HTB_RTAB]  = { .type = NLA_BINARY, .len = TC_RTAB_SIZE },
+       [TCA_HTB_DIRECT_QLEN] = { .type = NLA_U32 },
 };
 
 static void htb_work_func(struct work_struct *work)
@@ -994,7 +995,7 @@ static void htb_work_func(struct work_struct *work)
 static int htb_init(struct Qdisc *sch, struct nlattr *opt)
 {
        struct htb_sched *q = qdisc_priv(sch);
-       struct nlattr *tb[TCA_HTB_INIT + 1];
+       struct nlattr *tb[TCA_HTB_MAX + 1];
        struct tc_htb_glob *gopt;
        int err;
        int i;
@@ -1002,20 +1003,16 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt)
        if (!opt)
                return -EINVAL;
 
-       err = nla_parse_nested(tb, TCA_HTB_INIT, opt, htb_policy);
+       err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy);
        if (err < 0)
                return err;
 
-       if (tb[TCA_HTB_INIT] == NULL) {
-               pr_err("HTB: hey probably you have bad tc tool ?\n");
+       if (!tb[TCA_HTB_INIT])
                return -EINVAL;
-       }
+
        gopt = nla_data(tb[TCA_HTB_INIT]);
-       if (gopt->version != HTB_VER >> 16) {
-               pr_err("HTB: need tc/htb version %d (minor is %d), you have %d\n",
-                      HTB_VER >> 16, HTB_VER & 0xffff, gopt->version);
+       if (gopt->version != HTB_VER >> 16)
                return -EINVAL;
-       }
 
        err = qdisc_class_hash_init(&q->clhash);
        if (err < 0)
@@ -1027,10 +1024,13 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt)
        INIT_WORK(&q->work, htb_work_func);
        skb_queue_head_init(&q->direct_queue);
 
-       q->direct_qlen = qdisc_dev(sch)->tx_queue_len;
-       if (q->direct_qlen < 2) /* some devices have zero tx_queue_len */
-               q->direct_qlen = 2;
-
+       if (tb[TCA_HTB_DIRECT_QLEN])
+               q->direct_qlen = nla_get_u32(tb[TCA_HTB_DIRECT_QLEN]);
+       else {
+               q->direct_qlen = qdisc_dev(sch)->tx_queue_len;
+               if (q->direct_qlen < 2) /* some devices have zero tx_queue_len */
+                       q->direct_qlen = 2;
+       }
        if ((q->rate2quantum = gopt->rate2quantum) < 1)
                q->rate2quantum = 1;
        q->defcls = gopt->defcls;
@@ -1056,7 +1056,8 @@ static int htb_dump(struct Qdisc *sch, struct sk_buff *skb)
        nest = nla_nest_start(skb, TCA_OPTIONS);
        if (nest == NULL)
                goto nla_put_failure;
-       if (nla_put(skb, TCA_HTB_INIT, sizeof(gopt), &gopt))
+       if (nla_put(skb, TCA_HTB_INIT, sizeof(gopt), &gopt) ||
+           nla_put_u32(skb, TCA_HTB_DIRECT_QLEN, q->direct_qlen))
                goto nla_put_failure;
        nla_nest_end(skb, nest);
 
@@ -1311,7 +1312,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
        struct htb_sched *q = qdisc_priv(sch);
        struct htb_class *cl = (struct htb_class *)*arg, *parent;
        struct nlattr *opt = tca[TCA_OPTIONS];
-       struct nlattr *tb[__TCA_HTB_MAX];
+       struct nlattr *tb[TCA_HTB_MAX + 1];
        struct tc_htb_opt *hopt;
 
        /* extract all subattrs from opt attr */