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nvme-rdma: limit the maximal queue size for RDMA controllers

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Corrent limit of 1024 isn't valid for some of the RDMA based ctrls. In
case the target expose a cap of larger amount of entries (e.g. 1024),
the initiator may fail to create a QP with this size. Thus limit to a
value that works for all RDMA adapters.

Future general solution should use RDMA/core API to calculate this size
according to device capabilities and number of WRs needed per NVMe IO
request.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Max Gurtovoy 2021-09-23 00:55:35 +03:00 committed by Christoph Hellwig
parent 2351ead99c
commit 44c3c6257e
2 changed files with 9 additions and 0 deletions
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7
drivers/nvme/host/rdma.c
View File

@ -1112,6 +1112,13 @@ static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
}
if (ctrl->ctrl.sqsize + 1 > NVME_RDMA_MAX_QUEUE_SIZE) {
dev_warn(ctrl->ctrl.device,
"ctrl sqsize %u > max queue size %u, clamping down\n",
ctrl->ctrl.sqsize + 1, NVME_RDMA_MAX_QUEUE_SIZE);
ctrl->ctrl.sqsize = NVME_RDMA_MAX_QUEUE_SIZE - 1;
}
if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
dev_warn(ctrl->ctrl.device,
"sqsize %u > ctrl maxcmd %u, clamping down\n",

2
include/linux/nvme-rdma.h
View File

@ -6,6 +6,8 @@
#ifndef _LINUX_NVME_RDMA_H
#define _LINUX_NVME_RDMA_H
#define NVME_RDMA_MAX_QUEUE_SIZE 128
enum nvme_rdma_cm_fmt {
NVME_RDMA_CM_FMT_1_0 = 0x0,
};