iw_cxgb4: cq/qp mask depends on bar2 pages in a host page

Adjust the cq/qp mask based on the number of bar2 pages in a host page.

For user-mode rdma, the granularity of the BAR2 memory mapped to a user
rdma process during queue allocation must be based on the host page
size. The lld attributes udb_density and ucq_density are used to figure
out how many sge contexts are in a bar2 page. So the rdev->qpmask and
rdev->cqmask in iw_cxgb4 need to now be adjusted based on how many sge
bar2 pages are in a host page.

Otherwise the device fails to work on non 4k page size systems.

Fixes: 2391b0030e24 ("cxgb4: Remove SGE_HOST_PAGE_SIZE dependency on page size")
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index c13c0ba..d499cd6 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -783,6 +783,7 @@ void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
 {
        int err;
+       unsigned int factor;
 
        c4iw_init_dev_ucontext(rdev, &rdev->uctx);
 
@@ -806,8 +807,18 @@ static int c4iw_rdev_open(struct c4iw_rdev *rdev)
                return -EINVAL;
        }
 
-       rdev->qpmask = rdev->lldi.udb_density - 1;
-       rdev->cqmask = rdev->lldi.ucq_density - 1;
+       /* This implementation requires a sge_host_page_size <= PAGE_SIZE. */
+       if (rdev->lldi.sge_host_page_size > PAGE_SIZE) {
+               pr_err("%s: unsupported sge host page size %u\n",
+                      pci_name(rdev->lldi.pdev),
+                      rdev->lldi.sge_host_page_size);
+               return -EINVAL;
+       }
+
+       factor = PAGE_SIZE / rdev->lldi.sge_host_page_size;
+       rdev->qpmask = (rdev->lldi.udb_density * factor) - 1;
+       rdev->cqmask = (rdev->lldi.ucq_density * factor) - 1;
+
        pr_debug("dev %s stag start 0x%0x size 0x%0x num stags %d pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x qp qid start %u size %u cq qid start %u size %u srq size %u\n",
                 pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
                 rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),