From: Martin KaFai Lau <kafai@fb.com>
To: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Cc: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Benjamin Herrenschmidt <benh@amazon.com>,
Kuniyuki Iwashima <kuni1840@gmail.com>,
<osa-contribution-log@amazon.com>, <bpf@vger.kernel.org>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1 bpf-next 09/11] bpf: Support bpf_get_socket_cookie_sock() for BPF_PROG_TYPE_SK_REUSEPORT.
Date: Fri, 4 Dec 2020 11:58:07 -0800 [thread overview]
Message-ID: <20201204195807.mnckuteadncd4spr@kafai-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20201201144418.35045-10-kuniyu@amazon.co.jp>
On Tue, Dec 01, 2020 at 11:44:16PM +0900, Kuniyuki Iwashima wrote:
> We will call sock_reuseport.prog for socket migration in the next commit,
> so the eBPF program has to know which listener is closing in order to
> select the new listener.
>
> Currently, we can get a unique ID for each listener in the userspace by
> calling bpf_map_lookup_elem() for BPF_MAP_TYPE_REUSEPORT_SOCKARRAY map.
>
> This patch makes the sk pointer available in sk_reuseport_md so that we can
> get the ID by BPF_FUNC_get_socket_cookie() in the eBPF program.
>
> Link: https://lore.kernel.org/netdev/20201119001154.kapwihc2plp4f7zc@kafai-mbp.dhcp.thefacebook.com/
> Suggested-by: Martin KaFai Lau <kafai@fb.com>
> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
> ---
> include/uapi/linux/bpf.h | 8 ++++++++
> net/core/filter.c | 12 +++++++++++-
> tools/include/uapi/linux/bpf.h | 8 ++++++++
> 3 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index efe342bf3dbc..3e9b8bd42b4e 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -1650,6 +1650,13 @@ union bpf_attr {
> * A 8-byte long non-decreasing number on success, or 0 if the
> * socket field is missing inside *skb*.
> *
> + * u64 bpf_get_socket_cookie(struct bpf_sock *sk)
> + * Description
> + * Equivalent to bpf_get_socket_cookie() helper that accepts
> + * *skb*, but gets socket from **struct bpf_sock** context.
> + * Return
> + * A 8-byte long non-decreasing number.
> + *
> * u64 bpf_get_socket_cookie(struct bpf_sock_addr *ctx)
> * Description
> * Equivalent to bpf_get_socket_cookie() helper that accepts
> @@ -4420,6 +4427,7 @@ struct sk_reuseport_md {
> __u32 bind_inany; /* Is sock bound to an INANY address? */
> __u32 hash; /* A hash of the packet 4 tuples */
> __u8 migration; /* Migration type */
> + __bpf_md_ptr(struct bpf_sock *, sk); /* current listening socket */
> };
>
> #define BPF_TAG_SIZE 8
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 0a0634787bb4..1059d31847ef 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -4628,7 +4628,7 @@ static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = {
> .func = bpf_get_socket_cookie_sock,
> .gpl_only = false,
> .ret_type = RET_INTEGER,
> - .arg1_type = ARG_PTR_TO_CTX,
> + .arg1_type = ARG_PTR_TO_SOCKET,
This will break existing bpf prog (BPF_PROG_TYPE_CGROUP_SOCK)
using this proto. A new proto is needed and there is
an on-going patch doing this [0].
[0]: https://lore.kernel.org/bpf/20201203213330.1657666-1-revest@google.com/
next prev parent reply other threads:[~2020-12-04 19:59 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 14:44 [PATCH v1 bpf-next 00/11] Socket migration for SO_REUSEPORT Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 01/11] tcp: Keep TCP_CLOSE sockets in the reuseport group Kuniyuki Iwashima
2020-12-05 1:31 ` Martin KaFai Lau
2020-12-06 4:38 ` Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 02/11] bpf: Define migration types for SO_REUSEPORT Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 03/11] tcp: Migrate TCP_ESTABLISHED/TCP_SYN_RECV sockets in accept queues Kuniyuki Iwashima
2020-12-01 15:25 ` Eric Dumazet
2020-12-03 14:14 ` Kuniyuki Iwashima
2020-12-03 14:31 ` Eric Dumazet
2020-12-03 15:41 ` Kuniyuki Iwashima
2020-12-07 20:33 ` Martin KaFai Lau
2020-12-08 6:31 ` Kuniyuki Iwashima
2020-12-08 7:34 ` Martin KaFai Lau
2020-12-08 8:17 ` Kuniyuki Iwashima
2020-12-09 3:09 ` Martin KaFai Lau
2020-12-09 8:05 ` Kuniyuki Iwashima
2020-12-09 16:57 ` Kuniyuki Iwashima
2020-12-10 1:53 ` Martin KaFai Lau
2020-12-10 5:58 ` Kuniyuki Iwashima
2020-12-10 19:33 ` Martin KaFai Lau
2020-12-14 17:16 ` Kuniyuki Iwashima
2020-12-05 1:42 ` Martin KaFai Lau
2020-12-06 4:41 ` Kuniyuki Iwashima
[not found] ` <20201205160307.91179-1-kuniyu@amazon.co.jp>
2020-12-07 20:14 ` Martin KaFai Lau
2020-12-08 6:27 ` Kuniyuki Iwashima
2020-12-08 8:13 ` Martin KaFai Lau
2020-12-08 9:02 ` Kuniyuki Iwashima
2020-12-08 6:54 ` Martin KaFai Lau
2020-12-08 7:42 ` Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 04/11] tcp: Migrate TFO requests causing RST during TCP_SYN_RECV Kuniyuki Iwashima
2020-12-01 15:30 ` Eric Dumazet
2020-12-01 14:44 ` [PATCH v1 bpf-next 05/11] tcp: Migrate TCP_NEW_SYN_RECV requests Kuniyuki Iwashima
2020-12-01 15:13 ` Eric Dumazet
2020-12-03 14:12 ` Kuniyuki Iwashima
2020-12-10 0:07 ` Martin KaFai Lau
2020-12-10 5:15 ` Kuniyuki Iwashima
2020-12-10 18:49 ` Martin KaFai Lau
2020-12-14 17:03 ` Kuniyuki Iwashima
2020-12-15 2:58 ` Martin KaFai Lau
2020-12-16 16:41 ` Kuniyuki Iwashima
2020-12-16 22:24 ` Martin KaFai Lau
2020-12-01 14:44 ` [PATCH v1 bpf-next 06/11] bpf: Introduce two attach types for BPF_PROG_TYPE_SK_REUSEPORT Kuniyuki Iwashima
2020-12-02 2:04 ` Andrii Nakryiko
2020-12-02 19:19 ` Martin KaFai Lau
2020-12-03 4:24 ` Martin KaFai Lau
2020-12-03 14:16 ` Kuniyuki Iwashima
2020-12-04 5:56 ` Martin KaFai Lau
2020-12-06 4:32 ` Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 07/11] libbpf: Set expected_attach_type " Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 08/11] bpf: Add migration to sk_reuseport_(kern|md) Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 09/11] bpf: Support bpf_get_socket_cookie_sock() for BPF_PROG_TYPE_SK_REUSEPORT Kuniyuki Iwashima
2020-12-04 19:58 ` Martin KaFai Lau [this message]
2020-12-06 4:36 ` Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 10/11] bpf: Call bpf_run_sk_reuseport() for socket migration Kuniyuki Iwashima
2020-12-01 14:44 ` [PATCH v1 bpf-next 11/11] bpf: Test BPF_SK_REUSEPORT_SELECT_OR_MIGRATE Kuniyuki Iwashima
2020-12-05 1:50 ` Martin KaFai Lau
2020-12-06 4:43 ` Kuniyuki Iwashima
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