nvme-rdma: parallelize I/O queue allocation and startup

Refactor nvme rdma I/O queue setup to use async API, combining
allocation and startup into a single parallel operation per queue. This
reduces connection and reconnection setup time when there are delays in
establishing connections, which is especially important for
high-core-count hosts.

Key changes:
- Use async API to facilitate parallel calls for io queue setup.
- Add nvme_rdma_setup_ctx for propagating errors from async workers.
- Remove nvme_rdma_alloc_io_queues() and nvme_rdma_start_io_queues();
  their logic is folded into nvme_rdma_setup_io_queues() and
  nvme_rdma_configure_io_queues().
- Move queue count negotiation (nvme_set_queue_count,
  nvmf_set_io_queues) from the removed nvme_rdma_alloc_io_queues()
  into nvme_rdma_configure_io_queues().

Testing on a 64-core host with 64 IO-queues shows
nvme-rdma connection time reduced from ~1.4s to 416ms.

Signed-off-by: Surabhi Gogte <sgogte@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

0 files changed, 0 insertions, 0 deletions