tcp: Add receive timestamp support for receive zerocopy.
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>
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