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Sun, 09 Mar 2025 05:30:36 -0700 (PDT) From: Jason Xing To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, 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, horms@kernel.org, kuniyu@amazon.com, ncardwell@google.com Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, Jason Xing Subject: [PATCH net-next 1/5] tcp: bpf: support bpf_getsockopt for TCP_BPF_RTO_MIN Date: Sun, 9 Mar 2025 13:30:00 +0100 Message-Id: <20250309123004.85612-2-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250309123004.85612-1-kerneljasonxing@gmail.com> References: <20250309123004.85612-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Support bpf_getsockopt if application tries to know what the RTO MIN of this socket is. Signed-off-by: Jason Xing --- net/core/filter.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index a0867c5b32b3..31aef259e104 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5415,6 +5415,17 @@ static int sol_tcp_sockopt(struct sock *sk, int optname, if (*optlen < 1) return -EINVAL; break; + case TCP_BPF_RTO_MIN: + if (*optlen != sizeof(int)) + return -EINVAL; + if (getopt) { + int rto_min = inet_csk(sk)->icsk_rto_min; + int rto_min_us = jiffies_to_usecs(rto_min); + + memcpy(optval, &rto_min_us, *optlen); + return 0; + } + return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen); case TCP_BPF_SOCK_OPS_CB_FLAGS: if (*optlen != sizeof(int)) return -EINVAL; -- 2.43.5