net: sched: Add TCA_HW_OFFLOAD

Qdiscs can be offloaded to HW, but current implementation isn't uniform.
Instead, qdiscs either pass information about offload status via their
TCA_OPTIONS or omit it altogether.

Introduce a new attribute - TCA_HW_OFFLOAD that would form a uniform
uAPI for the offloading status of qdiscs.

Signed-off-by: Yuval Mintz <yuvalm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 65d0d25..83a3e47 100644 (file)
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -71,6 +71,7 @@ struct Qdisc {
                                      * qdisc_tree_decrease_qlen() should stop.
                                      */
 #define TCQ_F_INVISIBLE                0x80 /* invisible by default in dump */
+#define TCQ_F_OFFLOADED                0x200 /* qdisc is offloaded to HW */
        u32                     limit;
        const struct Qdisc_ops  *ops;
        struct qdisc_size_table __rcu *stab;

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index d8b5f80..843e29a 100644 (file)
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -557,6 +557,7 @@ enum {
        TCA_PAD,
        TCA_DUMP_INVISIBLE,
        TCA_CHAIN,
+       TCA_HW_OFFLOAD,
        __TCA_MAX
 };
 

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index b6c4f53..0f1eab9 100644 (file)
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -795,6 +795,8 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
        tcm->tcm_info = refcount_read(&q->refcnt);
        if (nla_put_string(skb, TCA_KIND, q->ops->id))
                goto nla_put_failure;
+       if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
+               goto nla_put_failure;
        if (q->ops->dump && q->ops->dump(q, skb) < 0)
                goto nla_put_failure;
        qlen = q->q.qlen;