On 5/20/2020 10:03 AM, Sagi Grimberg wrote:
This is the fourth re-incarnation of the CQ pool patches proposed
by Sagi and Christoph. I have started with the patches that Sagi last
submitted and built the CQ pool as a new API for acquiring shared CQs.
The main change from Sagi's last proposal is that I have simplified the
method that ULP drivers interact with the CQ pool. Instead of calling
ib_alloc_cq they now call ib_cq_pool_get but use the CQ in the same
manner
that they did before. This allows for a much easier transition to using
shared CQs by the ULP and makes it easier to deal with IB_POLL_DIRECT
contexts. Certain types of actions on CQs have been prevented on shared
CQs in order to prevent one user from harming another.
Our ULPs often want to make smart decisions on completion vector
affinitization when using multiple completion queues spread on
multiple cpu cores. We can see examples for this in iser, srp,
nvme-rdma.
Yamin, didn't you promise to adjust other ulps as well in the next post?
I was looking to get it accepted first, I did not want to tie acceptance
of the feature to the use in all the different ulps. I can prepare
another patch set with other ulps now or later
