From: Jason Xing <kerneljasonxing@gmail.com>
Date: Wed, 12 Mar 2025 15:35:22 +0000 (+0100)
Subject: tcp: bpf: Support bpf_getsockopt for TCP_BPF_DELACK_MAX
X-Git-Tag: v6.15-rc1~160^2~70^2^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d22b8b04b88e39d0ed1177fb31fd3e880ac0ee2d;p=thirdparty%2Fkernel%2Flinux.git

tcp: bpf: Support bpf_getsockopt for TCP_BPF_DELACK_MAX

Support bpf_getsockopt if application tries to know what the delayed ack
max time is.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250312153523.9860-4-kerneljasonxing@gmail.com
---

diff --git a/net/core/filter.c b/net/core/filter.c
index 4d34d35af5c78..46ae8eb7a03cb 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5301,6 +5301,12 @@ static int bpf_sol_tcp_getsockopt(struct sock *sk, int optname,
 		memcpy(optval, &rto_min_us, optlen);
 		break;
 	}
+	case TCP_BPF_DELACK_MAX: {
+		int delack_max_us = jiffies_to_usecs(inet_csk(sk)->icsk_delack_max);
+
+		memcpy(optval, &delack_max_us, optlen);
+		break;
+	}
 	default:
 		return -EINVAL;
 	}