[PATCHv4 0/3] nvme-tcp: fixup I/O stall on congested sockets

[Hannes Reinecke]

Hi all,

I have been chasing keep-alive timeouts with TLS enabled in the last few
days (weeks, even :-(). On larger setups (eg with 32 queues) the connection
never got established properly as I've been hitting keep-alive timeouts before
the last queue got connected.
Turns out that occasionally we simply do not send the keep-alive request; it's
been added to the request list but the io_work workqueue function is never
restarted as it bails out after nvme_tcp_try_recv() returns -EAGAIN.
During debugging I also found that we're quite lazy with the list
handling of requests, so I've added two preliminary patches to ensure
that all list elements are properly terminated.

As usual, comments and reviews are welcome.

Changes to v3:
- Drop merged patch to open-code nvme_tcp_queue_requests()
- Add patch to check for sk_stream_is_writeable()

Changes to v2:
- Removed AEN patches again

Changes to the original submission:
- Include reviews from Chris Leech
- Add patch to requeue namespace scan
- Add patch to re-read ANA log page

Hannes Reinecke (3):
  nvme-tcp: sanitize request list handling
  nvme-tcp: fix I/O stalls on congested sockets
  nvme-tcp: do not queue io_work on a full socket

 drivers/nvme/host/tcp.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

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2.35.3