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For TCP sockets, TX timestamps are only captured when the user data is successfully and fully written to the socket. In many cases, however, TCP writes can be partial for which no timestamp is collected. Collect timestamps whenever any user data is (fully or partially) copied into the socket. Pass tcp_write_queue_tail to tcp_tx_timestamp instead of the local skb pointer since it can be set to NULL on the error path. Note that tcp_write_queue_tail can be NULL, even if bytes have been copied to the socket. This is because acknowledgements are being processed in tcp_sendmsg(), and by the time tcp_tx_timestamp is called tcp_write_queue_tail can be NULL. For such cases, this patch does not collect any timestamps (i.e., it is best-effort). This patch is written with suggestions from Willem de Bruijn and Eric Dumazet. Change-log V1 -> V2: - Use sockc.tsflags instead of sk->sk_tsflags. - Use the same code path for normal writes and errors. Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Martin KaFai Lau <kafai@fb.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.