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[99.73.38.187]) by smtp.gmail.com with ESMTPSA id t20sm7430231oot.22.2020.10.09.00.03.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 00:03:29 -0700 (PDT) From: "Nikita V. Shirokov" To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , netdev@vger.kernel.org, Yonghong Song , "Nikita V. Shirokov" Subject: [PATCH bpf-next v2] bpf: add tcp_notsent_lowat bpf setsockopt Date: Fri, 9 Oct 2020 07:03:25 +0000 Message-Id: <20201009070325.226855-1-tehnerd@tehnerd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Adding support for TCP_NOTSENT_LOWAT sockoption (https://lwn.net/Articles/560082/) in tcpbpf v1->v2: - addressing yhs@ comments. explicitly defining TCP_NOTSENT_LOWAT in selftests if it is not defined in the system Signed-off-by: Nikita V. Shirokov Acked-by: Yonghong Song --- include/uapi/linux/bpf.h | 2 +- net/core/filter.c | 4 ++++ .../selftests/bpf/progs/connect4_prog.c | 19 +++++++++++++++++++ 3 files changed, 24 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index d83561e8cd2c..42d2df799397 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1698,7 +1698,7 @@ union bpf_attr { * **TCP_CONGESTION**, **TCP_BPF_IW**, * **TCP_BPF_SNDCWND_CLAMP**, **TCP_SAVE_SYN**, * **TCP_KEEPIDLE**, **TCP_KEEPINTVL**, **TCP_KEEPCNT**, - * **TCP_SYNCNT**, **TCP_USER_TIMEOUT**. + * **TCP_SYNCNT**, **TCP_USER_TIMEOUT**, **TCP_NOTSENT_LOWAT**. * * **IPPROTO_IP**, which supports *optname* **IP_TOS**. * * **IPPROTO_IPV6**, which supports *optname* **IPV6_TCLASS**. * Return diff --git a/net/core/filter.c b/net/core/filter.c index 05df73780dd3..5da44b11e1ec 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4827,6 +4827,10 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, else icsk->icsk_user_timeout = val; break; + case TCP_NOTSENT_LOWAT: + tp->notsent_lowat = val; + sk->sk_write_space(sk); + break; default: ret = -EINVAL; } diff --git a/tools/testing/selftests/bpf/progs/connect4_prog.c b/tools/testing/selftests/bpf/progs/connect4_prog.c index b1b2773c0b9d..a943d394fd3a 100644 --- a/tools/testing/selftests/bpf/progs/connect4_prog.c +++ b/tools/testing/selftests/bpf/progs/connect4_prog.c @@ -23,6 +23,10 @@ #define TCP_CA_NAME_MAX 16 #endif +#ifndef TCP_NOTSENT_LOWAT +#define TCP_NOTSENT_LOWAT 25 +#endif + #ifndef IFNAMSIZ #define IFNAMSIZ 16 #endif @@ -128,6 +132,18 @@ static __inline int set_keepalive(struct bpf_sock_addr *ctx) return 0; } +static __inline int set_notsent_lowat(struct bpf_sock_addr *ctx) +{ + int lowat = 65535; + + if (ctx->type == SOCK_STREAM) { + if (bpf_setsockopt(ctx, SOL_TCP, TCP_NOTSENT_LOWAT, &lowat, sizeof(lowat))) + return 1; + } + + return 0; +} + SEC("cgroup/connect4") int connect_v4_prog(struct bpf_sock_addr *ctx) { @@ -148,6 +164,9 @@ int connect_v4_prog(struct bpf_sock_addr *ctx) if (set_keepalive(ctx)) return 0; + if (set_notsent_lowat(ctx)) + return 0; + if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM) return 0; else if (ctx->type == SOCK_STREAM)