diff mbox series

[net-next,4/9] net-timestamp: introduce TS_ACK_OPT_CB to generate tcp acked timestamp

Message ID 20241008095109.99918-5-kerneljasonxing@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net-timestamp: bpf extension to equip applications transparently | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 206 this patch: 206
netdev/build_tools success Errors and warnings before: 2 (+1) this patch: 2 (+1)
netdev/cc_maintainers success CCed 17 of 17 maintainers
netdev/build_clang success Errors and warnings before: 257 this patch: 257
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 6961 this patch: 6961
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 31 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 54 this patch: 54
netdev/source_inline success Was 0 now: 0

Commit Message

Jason Xing Oct. 8, 2024, 9:51 a.m. UTC 
From: Jason Xing <kernelxing@tencent.com>

When the last sent skb in each sendmsg() is acknowledged in TCP layer,
we can print timestamp by setting BPF_SOCK_OPS_TS_ACK_OPT_CB in
bpf program.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
---
 include/uapi/linux/bpf.h       | 5 +++++
 net/core/skbuff.c              | 3 +++
 tools/include/uapi/linux/bpf.h | 5 +++++
 3 files changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 0d00539f247a..1b478ec18ac2 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7029,6 +7029,11 @@  enum {
 					 * feature is on. It indicates the
 					 * recorded timestamp.
 					 */
+	BPF_SOCK_OPS_TS_ACK_OPT_CB,	/* Called when all the skbs are
+					 * acknowledged when SO_TIMESTAMPING
+					 * feature is on. It indicates the
+					 * recorded timestamp.
+					 */
 };
 
 /* List of TCP states. There is a build check in net/ipv4/tcp.c to detect
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 8faaa96c026b..2b1b2f7d271a 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5559,6 +5559,9 @@  static bool bpf_skb_tstamp_tx(struct sock *sk, u32 scm_flag,
 		case SCM_TSTAMP_SND:
 			cb_flag = BPF_SOCK_OPS_TS_SW_OPT_CB;
 			break;
+		case SCM_TSTAMP_ACK:
+			cb_flag = BPF_SOCK_OPS_TS_ACK_OPT_CB;
+			break;
 		default:
 			return true;
 		}
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 020ec14ffae6..fc9b94de19f2 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -7028,6 +7028,11 @@  enum {
 					 * feature is on. It indicates the
 					 * recorded timestamp.
 					 */
+	BPF_SOCK_OPS_TS_ACK_OPT_CB,	/* Called when all the skbs are
+					 * acknowledged when SO_TIMESTAMPING
+					 * feature is on. It indicates the
+					 * recorded timestamp.
+					 */
 };
 
 /* List of TCP states. There is a build check in net/ipv4/tcp.c to detect