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Sun, 16 Feb 2025 19:43:42 -0800 (PST) From: Jason Xing To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, kuniyu@amazon.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, ykolal@fb.com Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, Jason Xing Subject: [PATCH bpf-next v2 2/3] bpf: support TCP_RTO_MAX_MS for bpf_setsockopt Date: Mon, 17 Feb 2025 11:42:44 +0800 Message-Id: <20250217034245.11063-3-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250217034245.11063-1-kerneljasonxing@gmail.com> References: <20250217034245.11063-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net Some applications don't want to wait for too long because the time of retransmission increases exponentially and can reach more than 10 seconds, for example. Eric implements the core logic on supporting rto max feature in the stack previously. Based on that, we can support it for BPF use. This patch reuses the same logic of TCP_RTO_MAX_MS in do_tcp_setsockopt() and do_tcp_getsockopt(). BPF program can call bpf_{set/get}sockopt() to set/get the maximum value of RTO. It would be good if a BPF program sets max value of RTO before transmission as we can see in the later patch (selftests). Signed-off-by: Jason Xing Reviewed-by: Kuniyuki Iwashima --- net/core/filter.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/core/filter.c b/net/core/filter.c index 2ec162dd83c4..ffec7b4357f9 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5382,6 +5382,7 @@ static int sol_tcp_sockopt(struct sock *sk, int optname, case TCP_USER_TIMEOUT: case TCP_NOTSENT_LOWAT: case TCP_SAVE_SYN: + case TCP_RTO_MAX_MS: if (*optlen != sizeof(int)) return -EINVAL; break;