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Date: Mon, 3 Dec 2018 14:28:07 -0800
From: Song Liu <liu.song.a23@...il.com>
To: sdf@...gle.com
Cc: Networking <netdev@...r.kernel.org>,
"David S . Miller" <davem@...emloft.net>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
simon.horman@...ronome.com
Subject: Re: [PATCH bpf-next 2/3] bpf: add BPF_PROG_TEST_RUN support for flow dissector
On Mon, Dec 3, 2018 at 11:00 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> The input is packet data, the output is struct bpf_flow_key. This should
> make it easy to test flow dissector programs without elaborate
> setup.
>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
> include/linux/bpf.h | 3 ++
> net/bpf/test_run.c | 76 +++++++++++++++++++++++++++++++++++++++++----
> net/core/filter.c | 1 +
> 3 files changed, 74 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index e82b7039fc66..7a572d15d5dd 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -373,6 +373,9 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
> union bpf_attr __user *uattr);
> int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
> union bpf_attr __user *uattr);
> +int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
> + const union bpf_attr *kattr,
> + union bpf_attr __user *uattr);
>
> /* an array of programs to be executed under rcu_lock.
> *
> diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
> index c89c22c49015..bfa05d31c6e3 100644
> --- a/net/bpf/test_run.c
> +++ b/net/bpf/test_run.c
> @@ -14,21 +14,33 @@
> #include <net/tcp.h>
>
> static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx,
> - struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE])
> + struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE],
> + struct bpf_flow_keys *flow_keys)
> {
> u32 ret;
>
> preempt_disable();
> rcu_read_lock();
> bpf_cgroup_storage_set(storage);
> - ret = BPF_PROG_RUN(prog, ctx);
> +
> + switch (prog->type) {
> + case BPF_PROG_TYPE_FLOW_DISSECTOR:
> + ret = __skb_flow_bpf_dissect(prog, ctx, &flow_keys_dissector,
> + flow_keys);
> + break;
> + default:
> + ret = BPF_PROG_RUN(prog, ctx);
> + break;
> + }
> +
Is it possible to fold the logic above into bpf_prog_test_run_flow_dissector()?
In that way, the logic flow is similar to other bpf_prog_test_run_XXX()
functions.
Thanks,
Song
> rcu_read_unlock();
> preempt_enable();
>
> return ret;
> }
>
> -static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
> +static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time,
> + struct bpf_flow_keys *flow_keys)
> {
> struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 0 };
> enum bpf_cgroup_storage_type stype;
> @@ -49,7 +61,7 @@ static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time)
> repeat = 1;
> time_start = ktime_get_ns();
> for (i = 0; i < repeat; i++) {
> - ret = bpf_test_run_one(prog, ctx, storage);
> + ret = bpf_test_run_one(prog, ctx, storage, flow_keys);
> if (need_resched()) {
> if (signal_pending(current))
> break;
> @@ -165,7 +177,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
> __skb_push(skb, hh_len);
> if (is_direct_pkt_access)
> bpf_compute_data_pointers(skb);
> - retval = bpf_test_run(prog, skb, repeat, &duration);
> + retval = bpf_test_run(prog, skb, repeat, &duration, NULL);
> if (!is_l2) {
> if (skb_headroom(skb) < hh_len) {
> int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
> @@ -212,7 +224,7 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
> rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
> xdp.rxq = &rxqueue->xdp_rxq;
>
> - retval = bpf_test_run(prog, &xdp, repeat, &duration);
> + retval = bpf_test_run(prog, &xdp, repeat, &duration, NULL);
> if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN ||
> xdp.data_end != xdp.data + size)
> size = xdp.data_end - xdp.data;
> @@ -220,3 +232,55 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
> kfree(data);
> return ret;
> }
> +
> +int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
> + const union bpf_attr *kattr,
> + union bpf_attr __user *uattr)
> +{
> + struct bpf_flow_keys flow_keys = {};
> + u32 size = kattr->test.data_size_in;
> + u32 repeat = kattr->test.repeat;
> + u32 retval, duration;
> + struct sk_buff *skb;
> + struct sock *sk;
> + void *data;
> + int ret;
> +
> + if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
> + return -EINVAL;
> +
> + data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
> + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> + sk = kzalloc(sizeof(*sk), GFP_USER);
> + if (!sk) {
> + kfree(data);
> + return -ENOMEM;
> + }
> + sock_net_set(sk, current->nsproxy->net_ns);
> + sock_init_data(NULL, sk);
> +
> + skb = build_skb(data, 0);
> + if (!skb) {
> + kfree(data);
> + kfree(sk);
> + return -ENOMEM;
> + }
> + skb->sk = sk;
> +
> + skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
> + __skb_put(skb, size);
> + skb->protocol = eth_type_trans(skb,
> + current->nsproxy->net_ns->loopback_dev);
> + skb_reset_network_header(skb);
> +
> + retval = bpf_test_run(prog, skb, repeat, &duration, &flow_keys);
> +
> + ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
> + retval, duration);
> + kfree_skb(skb);
> + kfree(sk);
> + return ret;
> +}
> diff --git a/net/core/filter.c b/net/core/filter.c
> index bd0df75dc7b6..4eae6102399d 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -7657,6 +7657,7 @@ const struct bpf_verifier_ops flow_dissector_verifier_ops = {
> };
>
> const struct bpf_prog_ops flow_dissector_prog_ops = {
> + .test_run = bpf_prog_test_run_flow_dissector,
> };
>
> int sk_detach_filter(struct sock *sk)
> --
> 2.20.0.rc1.387.gf8505762e3-goog
>
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