Add SOF_TIMESTAMPING_TX_ACK, a request for a tstamp when the last byte in the send() call is acknowledged. It implements the feature for TCP. The timestamp is generated when the TCP socket cumulative ACK is moved beyond the tracked seqno for the first time. The feature ignores SACK and FACK, because those acknowledge the specific byte, but not necessarily the entire contents of the buffer up to that byte.
Showing the changes to include/uapi/linux/errqueue.h (1 of 5 files). Show all
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| @@ -40,6 +40,7 @@ struct scm_timestamping { · 39 unmodified lines | |||
| 40 | enum { | 40 | enum { |
| 41 | SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */ | 41 | SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */ |
| 42 | SCM_TSTAMP_SCHED, /* data entered the packet scheduler */ | 42 | SCM_TSTAMP_SCHED, /* data entered the packet scheduler */ |
| 43 | SCM_TSTAMP_ACK, /* data acknowledged by peer */ | ||
| 43 | }; | 44 | }; |
| 44 | 45 | ||
| 45 | #endif /* _UAPI_LINUX_ERRQUEUE_H */ | 46 | #endif /* _UAPI_LINUX_ERRQUEUE_H */ |