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net: sched: cls_bpf: implement offload tcf_proto_op

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Add the offload tcf_proto_op in cls_bpf to generate an offload message for
each bpf prog in the given tcf_proto. Call the specified callback with
this new offload message. The function only returns an error if the
callback rejects adding a 'hardware only' prog.

A prog contains a flag to indicate if it is in hardware or not. To
ensure the offload function properly maintains this flag, keep a reference
counter for the number of instances of the prog that are in hardware. Only
update the flag when this counter changes from or to 0.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Hurley 2018-06-25 14:30:09 -07:00 committed by David S. Miller
parent 530d995123
commit 7e916b7680
1 changed files with 39 additions and 0 deletions
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39
net/sched/cls_bpf.c
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@ -43,6 +43,7 @@ struct cls_bpf_prog {
struct tcf_result res;
bool exts_integrated;
u32 gen_flags;
unsigned int in_hw_count;
struct tcf_exts exts;
u32 handle;
u16 bpf_num_ops;
@ -174,6 +175,7 @@ static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
cls_bpf_offload_cmd(tp, oldprog, prog, extack);
return err;
} else if (err > 0) {
prog->in_hw_count = err;
tcf_block_offload_inc(block, &prog->gen_flags);
}
}
@ -652,6 +654,42 @@ skip:
}
}
static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
void *cb_priv, struct netlink_ext_ack *extack)
{
struct cls_bpf_head *head = rtnl_dereference(tp->root);
struct tcf_block *block = tp->chain->block;
struct tc_cls_bpf_offload cls_bpf = {};
struct cls_bpf_prog *prog;
int err;
list_for_each_entry(prog, &head->plist, link) {
if (tc_skip_hw(prog->gen_flags))
continue;
tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags,
extack);
cls_bpf.command = TC_CLSBPF_OFFLOAD;
cls_bpf.exts = &prog->exts;
cls_bpf.prog = add ? prog->filter : NULL;
cls_bpf.oldprog = add ? NULL : prog->filter;
cls_bpf.name = prog->bpf_name;
cls_bpf.exts_integrated = prog->exts_integrated;
err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv);
if (err) {
if (add && tc_skip_sw(prog->gen_flags))
return err;
continue;
}
tc_cls_offload_cnt_update(block, &prog->in_hw_count,
&prog->gen_flags, add);
}
return 0;
}
static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
.kind = "bpf",
.owner = THIS_MODULE,
@ -662,6 +700,7 @@ static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
.change = cls_bpf_change,
.delete = cls_bpf_delete,
.walk = cls_bpf_walk,
.reoffload = cls_bpf_reoffload,
.dump = cls_bpf_dump,
.bind_class = cls_bpf_bind_class,
};