Re: [PATCH v4 0/3] nvme-tcp: parallelize I/O setup queue in connect

[Keith Busch <kbusch@kernel.org>]

On Tue, Sep 22, 2026 at 02:07:15PM -0600, Surabhi Gogte wrote:
> Similar to commit 2a8513091d2f ("nvme-rdma: parallelize I/O queue
> allocation and startup"), I/O queue allocation and start steps
> (including authentication) can be parallelized for nvme-tcp as well.
> 
> Patch 1 fixes a pre-existing bug: nvme_tcp_alloc_queue() used
> current->nsproxy->net_ns to create sockets during initial connect
> while it used kernel's init_net for reconnect and error recovery
> paths. The fix captures the caller's network namespace at controller
> allocation time.
> 
> Patch 2 is a preparatory refactor: it splits the queue-count
> negotiation and TLS PSK checks into helpers so that the individual
> steps can be called directly from nvme_tcp_configure_io_queues(). No
> functional change.
> 
> Patch 3 has the async implementation: it fans the per-queue alloc and
> start out over an async domain, serializes the per-cpu queue-count in
> nvme_tcp_set_queue_io_cpu() that can now run concurrently, and uses
> ctrl->net for all socket creation.
> 
> Testing on a 64-core host with 64 IO-queues shows nvme-tcp connection
> time reduced from 61ms to 11ms.

Thanks, applied to nvme-7.4.