netdev - [PATCH bpf-next v3 2/4] tcp: bpf: support bpf_getsockopt for TCP_BPF_RTO

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Message-Id: <20250312153523.9860-3-kerneljasonxing@gmail.com>
Date: Wed, 12 Mar 2025 16:35:21 +0100
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	dsahern@...nel.org,
	ast@...nel.org,
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	martin.lau@...ux.dev,
	eddyz87@...il.com,
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	ncardwell@...gle.com
Cc: bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	Jason Xing <kerneljasonxing@...il.com>
Subject: [PATCH bpf-next v3 2/4] tcp: bpf: support bpf_getsockopt for TCP_BPF_RTO_MIN

Support bpf_getsockopt if application tries to know what the RTO MIN
of this socket is.

Signed-off-by: Jason Xing <kerneljasonxing@...il.com>
---
 net/core/filter.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 2932de5cc57c..4d34d35af5c7 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5295,6 +5295,12 @@ static int bpf_sol_tcp_getsockopt(struct sock *sk, int optname,
 		memcpy(optval, &cb_flags, optlen);
 		break;
 	}
+	case TCP_BPF_RTO_MIN: {
+		int rto_min_us = jiffies_to_usecs(inet_csk(sk)->icsk_rto_min);
+
+		memcpy(optval, &rto_min_us, optlen);
+		break;
+	}
 	default:
 		return -EINVAL;
 	}
-- 
2.43.5