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Date: Thu, 2 Jun 2016 09:17:15 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
dinan.gunawardena@...ronome.com
Subject: Re: [RFC 02/12] net: cls_bpf: add hardware offload
Wed, Jun 01, 2016 at 06:50:04PM CEST, jakub.kicinski@...ronome.com wrote:
>This patch adds hardware offload capability to cls_bpf classifier,
>similar to what have been done with U32 and flower.
>
>Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>Reviewed-by: Dinan Gunawardena <dgunawardena@...ronome.com>
>Reviewed-by: Simon Horman <simon.horman@...ronome.com>
>---
> include/linux/netdevice.h | 2 ++
> include/net/pkt_cls.h | 14 ++++++++++
> net/sched/cls_bpf.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 87 insertions(+)
>
>diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>index f45929ce8157..6c8364b8aae9 100644
>--- a/include/linux/netdevice.h
>+++ b/include/linux/netdevice.h
>@@ -785,6 +785,7 @@ enum {
> TC_SETUP_MQPRIO,
> TC_SETUP_CLSU32,
> TC_SETUP_CLSFLOWER,
>+ TC_SETUP_CLSBPF,
> };
>
> struct tc_cls_u32_offload;
>@@ -795,6 +796,7 @@ struct tc_to_netdev {
> u8 tc;
> struct tc_cls_u32_offload *cls_u32;
> struct tc_cls_flower_offload *cls_flower;
>+ struct tc_cls_bpf_offload *cls_bpf;
> };
> };
>
>diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
>index 0f7efa88f210..10b7e8cdc98c 100644
>--- a/include/net/pkt_cls.h
>+++ b/include/net/pkt_cls.h
>@@ -438,4 +438,18 @@ struct tc_cls_flower_offload {
> struct tcf_exts *exts;
> };
>
>+enum tc_clsbpf_command {
>+ TC_CLSBPF_ADD,
>+ TC_CLSBPF_REPLACE,
>+ TC_CLSBPF_DESTROY,
>+};
>+
>+struct tc_cls_bpf_offload {
>+ enum tc_clsbpf_command command;
>+ struct tcf_exts *exts;
>+ struct bpf_prog *filter;
>+ const char *name;
>+ bool exts_integrated;
>+};
>+
> #endif
>diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
>index 7b342c779da7..b7c4c6dd6ad6 100644
>--- a/net/sched/cls_bpf.c
>+++ b/net/sched/cls_bpf.c
>@@ -39,6 +39,7 @@ struct cls_bpf_prog {
> struct list_head link;
> struct tcf_result res;
> bool exts_integrated;
>+ bool offloaded;
> struct tcf_exts exts;
> u32 handle;
> union {
>@@ -140,6 +141,72 @@ static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
> return !prog->bpf_ops;
> }
>
>+static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
>+ enum tc_clsbpf_command cmd)
>+{
>+ struct net_device *dev = tp->q->dev_queue->dev;
>+ struct tc_cls_bpf_offload bpf_offload = {};
>+ struct tc_to_netdev offload;
>+
>+ offload.type = TC_SETUP_CLSBPF;
>+ offload.cls_bpf = &bpf_offload;
>+
>+ bpf_offload.command = cmd;
>+ bpf_offload.exts = &prog->exts;
>+ bpf_offload.filter = prog->filter;
>+ bpf_offload.name = prog->bpf_name;
>+ bpf_offload.exts_integrated = prog->exts_integrated;
>+
>+ return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
>+ tp->protocol, &offload);
>+}
>+
>+static void cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
>+ struct cls_bpf_prog *oldprog)
>+{
>+ struct net_device *dev = tp->q->dev_queue->dev;
>+ struct cls_bpf_prog *obj = prog;
>+ enum tc_clsbpf_command cmd;
>+
>+ if (oldprog && oldprog->offloaded) {
>+ if (tc_should_offload(dev, 0)) {
>+ cmd = TC_CLSBPF_REPLACE;
>+ } else {
>+ obj = oldprog;
>+ cmd = TC_CLSBPF_DESTROY;
>+ }
>+ } else {
>+ if (!tc_should_offload(dev, 0))
>+ return;
>+ cmd = TC_CLSBPF_ADD;
>+ }
>+
>+ if (cls_bpf_offload_cmd(tp, obj, cmd))
>+ return;
>+
>+ obj->offloaded = true;
>+ if (oldprog)
>+ oldprog->offloaded = false;
>+}
>+
>+static void cls_bpf_stop_offload(struct tcf_proto *tp,
>+ struct cls_bpf_prog *prog)
>+{
>+ struct net_device *dev = tp->q->dev_queue->dev;
>+
>+ if (!prog->offloaded)
>+ return;
>+ if (WARN_ON(!tc_should_offload(dev, 0)))
>+ return;
>+
>+ if (cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY)) {
Please do:
err =
if (err)
>+ pr_err("Stopping hardware offload failed!\n");
>+ return;
>+ }
>+
>+ prog->offloaded = false;
>+}
>+
> static int cls_bpf_init(struct tcf_proto *tp)
> {
> struct cls_bpf_head *head;
>@@ -179,6 +246,7 @@ static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
> {
> struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg;
>
>+ cls_bpf_stop_offload(tp, prog);
> list_del_rcu(&prog->link);
> tcf_unbind_filter(tp, &prog->res);
> call_rcu(&prog->rcu, __cls_bpf_delete_prog);
>@@ -195,6 +263,7 @@ static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
> return false;
>
> list_for_each_entry_safe(prog, tmp, &head->plist, link) {
>+ cls_bpf_stop_offload(tp, prog);
> list_del_rcu(&prog->link);
> tcf_unbind_filter(tp, &prog->res);
> call_rcu(&prog->rcu, __cls_bpf_delete_prog);
>@@ -415,6 +484,8 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
> if (ret < 0)
> goto errout;
>
>+ cls_bpf_offload(tp, prog, oldprog);
>+
> if (oldprog) {
> list_replace_rcu(&oldprog->link, &prog->link);
> tcf_unbind_filter(tp, &oldprog->res);
>--
>1.9.1
>
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