From patchwork Sat Aug 5 09:42:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liu Jian X-Patchwork-Id: 13342556 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 410CB23A2; Sat, 5 Aug 2023 09:38:14 +0000 (UTC) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B374F10CA; Sat, 5 Aug 2023 02:38:12 -0700 (PDT) Received: from canpemm500010.china.huawei.com (unknown [172.30.72.57]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4RHyCf4X3rzrRxB; Sat, 5 Aug 2023 17:37:02 +0800 (CST) Received: from huawei.com (10.175.101.6) by canpemm500010.china.huawei.com (7.192.105.118) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Sat, 5 Aug 2023 17:38:08 +0800 From: Liu Jian To: , , , , , , , , , , , , , , , , CC: , , Subject: [PATCH bpf-next] bpf, sockmap: add BPF_F_PERMANENTLY flag for skmsg redirect Date: Sat, 5 Aug 2023 17:42:54 +0800 Message-ID: <20230805094254.1082999-1-liujian56@huawei.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To canpemm500010.china.huawei.com (7.192.105.118) X-CFilter-Loop: Reflected X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net If the sockmap msg redirection function is used only to forward packets and no other operation, the execution result of the BPF_SK_MSG_VERDICT program is the same each time. In this case, the BPF program only needs to be run once. Add BPF_F_PERMANENTLY flag to bpf_msg_redirect_map() and bpf_msg_redirect_hash() to implement this ability. Then we can enable this function in the bpf program as follows: bpf_msg_redirect_hash(xx, xx, xx, BPF_F_INGRESS | BPF_F_PERMANENTLY); Test results using netperf TCP_STREAM mode: for i in 1 64 128 512 1k 2k 32k 64k 100k 500k 1m;then netperf -T 1,2 -t TCP_STREAM -H 127.0.0.1 -l 20 -- -m $i -s 100m,100m -S 100m,100m done before: 3.84 246.52 496.89 1885.03 3415.29 6375.03 40749.09 48764.40 51611.34 55678.26 55992.78 after: 4.43 279.20 555.82 2080.79 3870.70 7105.44 41836.41 49709.75 51861.56 55211.00 54566.85 Signed-off-by: Liu Jian --- include/linux/skmsg.h | 1 + include/uapi/linux/bpf.h | 7 +++++-- net/core/skmsg.c | 1 + net/core/sock_map.c | 4 ++-- net/ipv4/tcp_bpf.c | 15 +++++++++------ tools/include/uapi/linux/bpf.h | 7 +++++-- 6 files changed, 23 insertions(+), 12 deletions(-) diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h index 054d7911bfc9..b2da9c432f52 100644 --- a/include/linux/skmsg.h +++ b/include/linux/skmsg.h @@ -82,6 +82,7 @@ struct sk_psock { u32 cork_bytes; u32 eval; bool redir_ingress; /* undefined if sk_redir is null */ + bool eval_permanently; struct sk_msg *cork; struct sk_psock_progs progs; #if IS_ENABLED(CONFIG_BPF_STREAM_PARSER) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 70da85200695..cf622ea4f018 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -3004,7 +3004,8 @@ union bpf_attr { * egress interfaces can be used for redirection. The * **BPF_F_INGRESS** value in *flags* is used to make the * distinction (ingress path is selected if the flag is present, - * egress path otherwise). This is the only flag supported for now. + * egress path otherwise). The **BPF_F_PERMANENTLY** value in + * *flags* is used to indicates whether the eBPF result is permanent. * Return * **SK_PASS** on success, or **SK_DROP** on error. * @@ -3276,7 +3277,8 @@ union bpf_attr { * egress interfaces can be used for redirection. The * **BPF_F_INGRESS** value in *flags* is used to make the * distinction (ingress path is selected if the flag is present, - * egress path otherwise). This is the only flag supported for now. + * egress path otherwise). The **BPF_F_PERMANENTLY** value in + * *flags* is used to indicates whether the eBPF result is permanent. * Return * **SK_PASS** on success, or **SK_DROP** on error. * @@ -5872,6 +5874,7 @@ enum { /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ enum { BPF_F_INGRESS = (1ULL << 0), + BPF_F_PERMANENTLY = (1ULL << 1), }; /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ diff --git a/net/core/skmsg.c b/net/core/skmsg.c index a29508e1ff35..b2bf9b5c4252 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -875,6 +875,7 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock, ret = bpf_prog_run_pin_on_cpu(prog, msg); ret = sk_psock_map_verd(ret, msg->sk_redir); psock->apply_bytes = msg->apply_bytes; + psock->eval_permanently = msg->flags & BPF_F_PERMANENTLY; if (ret == __SK_REDIRECT) { if (psock->sk_redir) { sock_put(psock->sk_redir); diff --git a/net/core/sock_map.c b/net/core/sock_map.c index 08ab108206bf..6a0c90be7f4f 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -662,7 +662,7 @@ BPF_CALL_4(bpf_msg_redirect_map, struct sk_msg *, msg, { struct sock *sk; - if (unlikely(flags & ~(BPF_F_INGRESS))) + if (unlikely(flags & ~(BPF_F_INGRESS | BPF_F_PERMANENTLY))) return SK_DROP; sk = __sock_map_lookup_elem(map, key); @@ -1261,7 +1261,7 @@ BPF_CALL_4(bpf_msg_redirect_hash, struct sk_msg *, msg, { struct sock *sk; - if (unlikely(flags & ~(BPF_F_INGRESS))) + if (unlikely(flags & ~(BPF_F_INGRESS | BPF_F_PERMANENTLY))) return SK_DROP; sk = __sock_hash_lookup_elem(map, key); diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c index 81f0dff69e0b..81c3d3ad44f7 100644 --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -419,8 +419,10 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock, if (!psock->apply_bytes) { /* Clean up before releasing the sock lock. */ eval = psock->eval; - psock->eval = __SK_NONE; - psock->sk_redir = NULL; + if (!psock->eval_permanently) { + psock->eval = __SK_NONE; + psock->sk_redir = NULL; + } } if (psock->cork) { cork = true; @@ -434,7 +436,7 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock, msg, tosend, flags); sent = origsize - msg->sg.size; - if (eval == __SK_REDIRECT) + if (!psock->eval_permanently && eval == __SK_REDIRECT) sock_put(sk_redir); lock_sock(sk); @@ -460,8 +462,8 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock, } if (likely(!ret)) { - if (!psock->apply_bytes) { - psock->eval = __SK_NONE; + if (!psock->apply_bytes && !psock->eval_permanently) { + psock->eval = __SK_NONE; if (psock->sk_redir) { sock_put(psock->sk_redir); psock->sk_redir = NULL; @@ -540,7 +542,8 @@ static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) if (psock->cork_bytes && !enospc) goto out_err; /* All cork bytes are accounted, rerun the prog. */ - psock->eval = __SK_NONE; + if (!psock->eval_permanently) + psock->eval = __SK_NONE; psock->cork_bytes = 0; } diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 70da85200695..cf622ea4f018 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -3004,7 +3004,8 @@ union bpf_attr { * egress interfaces can be used for redirection. The * **BPF_F_INGRESS** value in *flags* is used to make the * distinction (ingress path is selected if the flag is present, - * egress path otherwise). This is the only flag supported for now. + * egress path otherwise). The **BPF_F_PERMANENTLY** value in + * *flags* is used to indicates whether the eBPF result is permanent. * Return * **SK_PASS** on success, or **SK_DROP** on error. * @@ -3276,7 +3277,8 @@ union bpf_attr { * egress interfaces can be used for redirection. The * **BPF_F_INGRESS** value in *flags* is used to make the * distinction (ingress path is selected if the flag is present, - * egress path otherwise). This is the only flag supported for now. + * egress path otherwise). The **BPF_F_PERMANENTLY** value in + * *flags* is used to indicates whether the eBPF result is permanent. * Return * **SK_PASS** on success, or **SK_DROP** on error. * @@ -5872,6 +5874,7 @@ enum { /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ enum { BPF_F_INGRESS = (1ULL << 0), + BPF_F_PERMANENTLY = (1ULL << 1), }; /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */