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>

diff --git a/net/rds/ib.c b/net/rds/ib.c
index 27abdd3..868559a 100644 (file)
--- 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 c0de7af..1378b85 100644 (file)
--- 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 81033af..ef3ab5b 100644 (file)
--- 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,