RDS/IB: Always use PAGE_SIZE for FMR page size

While FMRs allow significant flexibility in what size of pages they can use,
we really just want FMR pages to match CPU page size. Roland says we can
count on this always being supported, so this simplifies things.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 12 deletions

diff --git a/net/rds/ib.c b/net/rds/ib.c
index 27abdd3df2cc..868559ac42d7 100644
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -85,9 +85,6 @@ void rds_ib_add_one(struct ib_device *device)
         rds_ibdev->max_wrs = dev_attr->max_qp_wr;
         rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
 
-        rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
-        rds_ibdev->fmr_page_size  = 1 << rds_ibdev->fmr_page_shift;
-        rds_ibdev->fmr_page_mask  = ~((u64) rds_ibdev->fmr_page_size - 1);
         rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
         rds_ibdev->max_fmrs = dev_attr->max_fmr ?
                         min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
diff --git a/net/rds/ib.h b/net/rds/ib.h
index c0de7af6cf60..1378b854cac0 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -159,9 +159,6 @@ struct rds_ib_device {
         struct ib_pd            *pd;
         struct ib_mr            *mr;
         struct rds_ib_mr_pool   *mr_pool;
-        int                     fmr_page_shift;
-        int                     fmr_page_size;
-        u64                     fmr_page_mask;
         unsigned int            fmr_max_remaps;
         unsigned int            max_fmrs;
         int                     max_sge;
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index 81033af93020..ef3ab5b7283e 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -211,7 +211,7 @@ struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev)
 
         pool->fmr_attr.max_pages = fmr_message_size;
         pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps;
-        pool->fmr_attr.page_shift = rds_ibdev->fmr_page_shift;
+        pool->fmr_attr.page_shift = PAGE_SHIFT;
         pool->max_free_pinned = rds_ibdev->max_fmrs * fmr_message_size / 4;
 
         /* We never allow more than max_items MRs to be allocated.
@@ -349,13 +349,13 @@ static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibm
                 unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
                 u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
 
-                if (dma_addr & ~rds_ibdev->fmr_page_mask) {
+                if (dma_addr & ~PAGE_MASK) {
                         if (i > 0)
                                 return -EINVAL;
                         else
                                 ++page_cnt;
                 }
-                if ((dma_addr + dma_len) & ~rds_ibdev->fmr_page_mask) {
+                if ((dma_addr + dma_len) & ~PAGE_MASK) {
                         if (i < sg_dma_len - 1)
                                 return -EINVAL;
                         else
@@ -365,7 +365,7 @@ static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibm
                 len += dma_len;
         }
 
-        page_cnt += len >> rds_ibdev->fmr_page_shift;
+        page_cnt += len >> PAGE_SHIFT;
         if (page_cnt > fmr_message_size)
                 return -EINVAL;
 
@@ -378,9 +378,9 @@ static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibm
                 unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
                 u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
 
-                for (j = 0; j < dma_len; j += rds_ibdev->fmr_page_size)
+                for (j = 0; j < dma_len; j += PAGE_SIZE)
                         dma_pages[page_cnt++] =
-                                (dma_addr & rds_ibdev->fmr_page_mask) + j;
+                                (dma_addr & PAGE_MASK) + j;
         }
 
         ret = ib_map_phys_fmr(ibmr->fmr,