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| author | Vadim Fedorenko <vadfed@meta.com> | 2024-10-01 05:57:14 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-10-04 11:52:19 -0700 |
| commit | 4aecca4c76808f3736056d18ff510df80424bc9f (patch) | |
| tree | 4daf56511a5d5838c9f8628b1409da8353a8fe71 /include/net/inet_sock.h | |
| parent | 34ea1df802f79d4498a12ca79eff6fffbf8fa7f3 (diff) | |
| download | linux-4aecca4c76808f3736056d18ff510df80424bc9f.tar.gz linux-4aecca4c76808f3736056d18ff510df80424bc9f.tar.bz2 linux-4aecca4c76808f3736056d18ff510df80424bc9f.zip | |
net_tstamp: add SCM_TS_OPT_ID to provide OPT_ID in control message
SOF_TIMESTAMPING_OPT_ID socket option flag gives a way to correlate TX
timestamps and packets sent via socket. Unfortunately, there is no way
to reliably predict socket timestamp ID value in case of error returned
by sendmsg. For UDP sockets it's impossible because of lockless
nature of UDP transmit, several threads may send packets in parallel. In
case of RAW sockets MSG_MORE option makes things complicated. More
details are in the conversation [1].
This patch adds new control message type to give user-space
software an opportunity to control the mapping between packets and
values by providing ID with each sendmsg for UDP sockets.
The documentation is also added in this patch.
[1] https://lore.kernel.org/netdev/CALCETrU0jB+kg0mhV6A8mrHfTE1D1pr1SD_B9Eaa9aDPfgHdtA@mail.gmail.com/
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Vadim Fedorenko <vadfed@meta.com>
Link: https://patch.msgid.link/20241001125716.2832769-2-vadfed@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/net/inet_sock.h')
| -rw-r--r-- | include/net/inet_sock.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h index 394c3b66065e..f01dd273bea6 100644 --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -174,6 +174,7 @@ struct inet_cork { __s16 tos; char priority; __u16 gso_size; + u32 ts_opt_id; u64 transmit_time; u32 mark; }; @@ -241,7 +242,8 @@ struct inet_sock { struct inet_cork_full cork; }; -#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ +#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ +#define IPCORK_TS_OPT_ID 2 /* ts_opt_id field is valid, overriding sk_tskey */ enum { INET_FLAGS_PKTINFO = 0, |