[PATCH 0/2] tcp: Runtime checks for availability of TCP_INFO fields

[David Gibson <david@gibson.dropbear.id.au>]

We have a number of Makefile tests for the presence of various fields
in tcp_info.  However that only tells us if they're present in the
kernel headers against which we're compiling, not whether they're
available in the kernel we're running on.  For anything outside the
earliest forms of TCP_INFO (as described in netinet/tcp.h and shared
with BSD), we should verify at runtime if the kernel is returning that
information.

This was supposed to be leading into improved handling of lazily
calling TCP_INFO, but I hit additional complications there, so I've
postponed it.  Might as well get these bits merged, though.

David Gibson (2):
  tcp: Generalise probing for tcpi_snd_wnd field
  tcp: Use runtime tests for TCP_INFO fields

 tcp.c | 97 +++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 57 insertions(+), 40 deletions(-)

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2.47.0