On 3/9/25 5:30 AM, Jason Xing wrote:
Support bpf_getsockopt if application tries to know what the delayed ack
max time is.
Signed-off-by: Jason Xing <kerneljasonxing@xxxxxxxxx>
---
net/core/filter.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index 31aef259e104..5564917e0c6d 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_DELACK_MAX:
+ if (*optlen != sizeof(int))
+ return -EINVAL;
+ if (getopt) {
+ int delack_max = inet_csk(sk)->icsk_delack_max;
+ int delack_max_us = jiffies_to_usecs(delack_max);
+
+ memcpy(optval, &delack_max_us, *optlen);
+ return 0;
+ }
+ return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen);
There are three TCP_BPF_* specific optnames supported by bpf_getsockopt now.
Please take this chance to create a bpf_sol_tcp_getsockopt and refactor the
existing bpf_getsockopt(TCP_BPF_SOCK_OPS_CB_FLAGS) support into it also. The new
bpf_sol_tcp_getsockopt can reject the TCP_BPF_IW and TCP_BPF_SNDCWND_CLAMP.
