Re: [PATCH v4 01/14] svcrdma: Reduce the number of rdma_rw contexts per-QP

Jason Gunthorpe
2025-05-06T13:17:25Z

On Tue, May 06, 2025 at 06:08:59AM -0700, Christoph Hellwig wrote:
> On Mon, Apr 28, 2025 at 03:36:49PM -0400, cel@kernel.org wrote:
> > qp_attr.cap.max_rdma_ctxs. The QP's actual Send Queue length is on
> > the order of the sum of qp_attr.cap.max_send_wr and a factor times
> > qp_attr.cap.max_rdma_ctxs. The factor can be up to three, depending
> > on whether MR operations are required before RDMA Reads.
> >
> > This limit is not visible to RDMA consumers via dev->attrs. When the
> > limit is surpassed, QP creation fails with -ENOMEM. For example:
>
> Can we find a way to expose this limit from the HCA drivers and the
> RDMA core?

Shouldn't it be max_qp_wr?

Jason