IB/srp: Fix completion vector assignment algorithm
authorBart Van Assche <bart.vanassche@wdc.com>
Mon, 12 Feb 2018 17:50:25 +0000 (09:50 -0800)
committerJason Gunthorpe <jgg@mellanox.com>
Thu, 15 Feb 2018 22:38:58 +0000 (15:38 -0700)
commit3a148896b24adf8688dc0c59af54531931677a40
tree43068fa2e2e23a460da296db46fb20265e554734
parent71591d1280e5ef02c2af2ffb9801d0c842973be9
IB/srp: Fix completion vector assignment algorithm

Ensure that cv_end is equal to ibdev->num_comp_vectors for the
NUMA node with the highest index. This patch improves spreading
of RDMA channels over completion vectors and thereby improves
performance, especially on systems with only a single NUMA node.
This patch drops support for the comp_vector login parameter by
ignoring the value of that parameter since I have not found a
good way to combine support for that parameter and automatic
spreading of RDMA channels over completion vectors.

Fixes: d92c0da71a35 ("IB/srp: Add multichannel support")
Reported-by: Alexander Schmid <alex@modula-shop-systems.de>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Alexander Schmid <alex@modula-shop-systems.de>
Cc: stable@vger.kernel.org
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
drivers/infiniband/ulp/srp/ib_srp.c