Linux RDMA and InfiniBand development
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From: Leon Romanovsky <leon@kernel.org>
To: Jiri Pirko <jiri@resnulli.us>
Cc: linux-rdma@vger.kernel.org, jgg@ziepe.ca, mrgolin@amazon.com
Subject: Re: [PATCH rdma-next v2 4/6] RDMA/uverbs: Add ioctl method for CQ resize
Date: Wed, 17 Jun 2026 14:06:05 +0300	[thread overview]
Message-ID: <20260617110605.GV327369@unreal> (raw)
In-Reply-To: <20260615085040.1396623-5-jiri@resnulli.us>

On Mon, Jun 15, 2026 at 10:50:38AM +0200, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@nvidia.com>
> 
> Resize CQ is currently only reachable through the legacy write()
> uverbs command (IB_USER_VERBS_CMD_RESIZE_CQ). Add an equivalent modern
> ioctl method, UVERBS_METHOD_CQ_RESIZE, on the CQ object so the
> operation is available through the ioctl interface and can carry
> per-attribute extensions. The handler mirrors the legacy command: it
> looks up the CQ, calls resize_user_cq() and returns the new cqe count.
> The legacy write path is left in place for ABI compatibility.

I have a general question. Do we actually need CQ resizing, given that it is
rarely implemented and often incorrect in existing drivers? Maybe this is a
good time to consider deprecating that path.

Thanks

  reply	other threads:[~2026-06-17 11:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-15  8:50 [PATCH rdma-next v2 0/6] RDMA: add per-attribute UMEM for SRQ create and CQ resize Jiri Pirko
2026-06-15  8:50 ` [PATCH rdma-next v2 1/6] RDMA/uverbs: Add SRQ buffer UMEM attribute Jiri Pirko
2026-06-15  8:50 ` [PATCH rdma-next v2 2/6] RDMA/mlx5: Use UMEM attribute for SRQ buffer in create_srq Jiri Pirko
2026-06-15  8:50 ` [PATCH rdma-next v2 3/6] RDMA/mlx5: Use UMEM attribute for SRQ doorbell record Jiri Pirko
2026-06-15  8:50 ` [PATCH rdma-next v2 4/6] RDMA/uverbs: Add ioctl method for CQ resize Jiri Pirko
2026-06-17 11:06   ` Leon Romanovsky [this message]
2026-06-15  8:50 ` [PATCH rdma-next v2 5/6] RDMA/uverbs: Add CQ resize buffer UMEM attribute Jiri Pirko
2026-06-15  8:50 ` [PATCH rdma-next v2 6/6] RDMA/mlx5: Use UMEM attribute for CQ resize buffer Jiri Pirko

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