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tcp: Add receive timestamp support for receive zerocopy.

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tcp_recvmsg() uses the CMSG mechanism to receive control information
like packet receive timestamps. This patch adds CMSG fields to
struct tcp_zerocopy_receive, and provides receive timestamps
if available to the user.

Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Arjun Roy 2021-01-20 16:41:48 -08:00 • committed by Jakub Kicinski
parent 925bba24e6
commit 7eeba1706e
2 changed files with 88 additions and 32 deletions
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4
include/uapi/linux/tcp.h
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@ -354,5 +354,9 @@ struct tcp_zerocopy_receive {
__u64 copybuf_address; /* in: copybuf address (small reads) */
__s32 copybuf_len; /* in/out: copybuf bytes avail/used or error */
__u32 flags; /* in: flags */
__u64 msg_control; /* ancillary data */
__u64 msg_controllen;
__u32 msg_flags;
/* __u32 hole; Next we must add >1 u32 otherwise length checks fail. */
};
#endif /* _UAPI_LINUX_TCP_H */