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sch_cake: Interpret fwmark parameter as a bitmask 

We initially interpreted the fwmark parameter as a flag that simply turned
on the feature, using the whole skb->mark field as the index into the CAKE
tin_order array. However, it is quite common for different applications to
use different parts of the mask field for their own purposes, each using a
different mask.

Support this use of subsets of the mark by interpreting the TCA_CAKE_FWMARK
parameter as a bitmask to apply to the fwmark field when reading it. The
result will be right-shifted by the number of unset lower bits of the mask
before looking up the tin.

In the original commit message we also failed to credit Felix Resch with
originally suggesting the fwmark feature back in 2017; so the Suggested-By
in this commit covers the whole fwmark feature.

Fixes: 0b5c7efdfc ("sch_cake: Permit use of connmarks as tin classifiers")
Suggested-by: Felix Resch <fuller@beif.de>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Toke Høiland-Jørgensen 2019-03-14 23:08:22 +01:00 committed by David S. Miller
parent 5bf7295fe3
commit eab2fc822a
1 changed files with 12 additions and 13 deletions
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25
net/sched/sch_cake.c
View File

@ -211,6 +211,9 @@ struct cake_sched_data {
u8 ack_filter;
u8 atm_mode;
u32 fwmark_mask;
u16 fwmark_shft;
/* time_next = time_this + ((len * rate_ns) >> rate_shft) */
u16 rate_shft;
ktime_t time_next_packet;
@ -258,8 +261,7 @@ enum {
CAKE_FLAG_AUTORATE_INGRESS = BIT(1),
CAKE_FLAG_INGRESS = BIT(2),
CAKE_FLAG_WASH = BIT(3),
CAKE_FLAG_SPLIT_GSO = BIT(4),
CAKE_FLAG_FWMARK = BIT(5)
CAKE_FLAG_SPLIT_GSO = BIT(4)
};
/* COBALT operates the Codel and BLUE algorithms in parallel, in order to
@ -1543,7 +1545,7 @@ static struct cake_tin_data *cake_select_tin(struct Qdisc *sch,
struct sk_buff *skb)
{
struct cake_sched_data *q = qdisc_priv(sch);
u32 tin;
u32 tin, mark;
u8 dscp;
/* Tin selection: Default to diffserv-based selection, allow overriding
@ -1551,14 +1553,13 @@ static struct cake_tin_data *cake_select_tin(struct Qdisc *sch,
*/
dscp = cake_handle_diffserv(skb,
q->rate_flags & CAKE_FLAG_WASH);
mark = (skb->mark & q->fwmark_mask) >> q->fwmark_shft;
if (q->tin_mode == CAKE_DIFFSERV_BESTEFFORT)
tin = 0;
else if (q->rate_flags & CAKE_FLAG_FWMARK && /* use fw mark */
skb->mark &&
skb->mark <= q->tin_cnt)
tin = q->tin_order[skb->mark - 1];
else if (mark && mark <= q->tin_cnt)
tin = q->tin_order[mark - 1];
else if (TC_H_MAJ(skb->priority) == sch->handle &&
TC_H_MIN(skb->priority) > 0 &&
@ -2172,6 +2173,7 @@ static const struct nla_policy cake_policy[TCA_CAKE_MAX + 1] = {
[TCA_CAKE_MPU] = { .type = NLA_U32 },
[TCA_CAKE_INGRESS] = { .type = NLA_U32 },
[TCA_CAKE_ACK_FILTER] = { .type = NLA_U32 },
[TCA_CAKE_FWMARK] = { .type = NLA_U32 },
};
static void cake_set_rate(struct cake_tin_data *b, u64 rate, u32 mtu,
@ -2619,10 +2621,8 @@ static int cake_change(struct Qdisc *sch, struct nlattr *opt,
}
if (tb[TCA_CAKE_FWMARK]) {
if (!!nla_get_u32(tb[TCA_CAKE_FWMARK]))
q->rate_flags |= CAKE_FLAG_FWMARK;
else
q->rate_flags &= ~CAKE_FLAG_FWMARK;
q->fwmark_mask = nla_get_u32(tb[TCA_CAKE_FWMARK]);
q->fwmark_shft = q->fwmark_mask ? __ffs(q->fwmark_mask) : 0;
}
if (q->tins) {
@ -2784,8 +2784,7 @@ static int cake_dump(struct Qdisc *sch, struct sk_buff *skb)
!!(q->rate_flags & CAKE_FLAG_SPLIT_GSO)))
goto nla_put_failure;
if (nla_put_u32(skb, TCA_CAKE_FWMARK,
!!(q->rate_flags & CAKE_FLAG_FWMARK)))
if (nla_put_u32(skb, TCA_CAKE_FWMARK, q->fwmark_mask))
goto nla_put_failure;
return nla_nest_end(skb, opts);