IB/mlx5: Limit mkey page size to 2GB

The maximum page size in the mkey context is 2GB.

Until today, we didn't enforce this requirement in the code,
and therefore, if we got a page size larger than 2GB, we
have passed zeros in the log_page_shift instead of the actual value
and the registration failed.

This patch limits the driver to use compound pages of 2GB for mkeys.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

6 files changed, 18 insertions, 8 deletions

diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c
index 79d017baf6f4..9e0598b5615f 100644
--- a/drivers/infiniband/hw/mlx5/cq.c
+++ b/drivers/infiniband/hw/mlx5/cq.c
@@ -770,7 +770,7 @@ static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata,
         if (err)
                 goto err_umem;
 
-        mlx5_ib_cont_pages(cq->buf.umem, ucmd.buf_addr, &npages, &page_shift,
+        mlx5_ib_cont_pages(cq->buf.umem, ucmd.buf_addr, 0, &npages, &page_shift,
                            &ncont, NULL);
         mlx5_ib_dbg(dev, "addr 0x%llx, size %u, npages %d, page_shift %d, ncont %d\n",
                     ucmd.buf_addr, entries * ucmd.cqe_size, npages, page_shift, ncont);
@@ -1125,7 +1125,7 @@ static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
                 return err;
         }
 
-        mlx5_ib_cont_pages(umem, ucmd.buf_addr, &npages, page_shift,
+        mlx5_ib_cont_pages(umem, ucmd.buf_addr, 0, &npages, page_shift,
                            npas, NULL);
 
         cq->resize_umem = umem;
diff --git a/drivers/infiniband/hw/mlx5/mem.c b/drivers/infiniband/hw/mlx5/mem.c
index 996b54e366b0..6851357c16f4 100644
--- a/drivers/infiniband/hw/mlx5/mem.c
+++ b/drivers/infiniband/hw/mlx5/mem.c
@@ -37,12 +37,15 @@
 
 /* @umem: umem object to scan
  * @addr: ib virtual address requested by the user
+ * @max_page_shift: high limit for page_shift - 0 means no limit
  * @count: number of PAGE_SIZE pages covered by umem
  * @shift: page shift for the compound pages found in the region
  * @ncont: number of compund pages
  * @order: log2 of the number of compound pages
  */
-void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
+void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr,
+                        unsigned long max_page_shift,
+                        int *count, int *shift,
                         int *ncont, int *order)
 {
         unsigned long tmp;
@@ -72,6 +75,8 @@ void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
         addr = addr >> page_shift;
         tmp = (unsigned long)addr;
         m = find_first_bit(&tmp, BITS_PER_LONG);
+        if (max_page_shift)
+                m = min_t(unsigned long, max_page_shift - page_shift, m);
         skip = 1 << m;
         mask = skip - 1;
         i = 0;
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index d5d007740159..95937e7d2584 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -63,6 +63,8 @@ pr_warn("%s:%s:%d:(pid %d): " format, (dev)->ib_dev.name, __func__,	\
 #define MLX5_IB_DEFAULT_UIDX 0xffffff
 #define MLX5_USER_ASSIGNED_UIDX_MASK __mlx5_mask(qpc, user_index)
 
+#define MLX5_MKEY_PAGE_SHIFT_MASK __mlx5_mask(mkc, log_page_size)
+
 enum {
         MLX5_IB_MMAP_CMD_SHIFT  = 8,
         MLX5_IB_MMAP_CMD_MASK   = 0xff,
@@ -823,7 +825,9 @@ int mlx5_ib_query_port(struct ib_device *ibdev, u8 port,
                        struct ib_port_attr *props);
 int mlx5_ib_init_fmr(struct mlx5_ib_dev *dev);
 void mlx5_ib_cleanup_fmr(struct mlx5_ib_dev *dev);
-void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
+void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr,
+                        unsigned long max_page_shift,
+                        int *count, int *shift,
                         int *ncont, int *order);
 void __mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
                             int page_shift, size_t offset, size_t num_pages,
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 881166a9d868..6cbda901f259 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -855,7 +855,8 @@ static struct ib_umem *mr_umem_get(struct ib_pd *pd, u64 start, u64 length,
                 return (void *)umem;
         }
 
-        mlx5_ib_cont_pages(umem, start, npages, page_shift, ncont, order);
+        mlx5_ib_cont_pages(umem, start, MLX5_MKEY_PAGE_SHIFT_MASK, npages,
+                           page_shift, ncont, order);
         if (!*npages) {
                 mlx5_ib_warn(dev, "avoid zero region\n");
                 ib_umem_release(umem);
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index c84b07f9f111..aa27688f5ae9 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -675,7 +675,7 @@ static int mlx5_ib_umem_get(struct mlx5_ib_dev *dev,
                 return PTR_ERR(*umem);
         }
 
-        mlx5_ib_cont_pages(*umem, addr, npages, page_shift, ncont, NULL);
+        mlx5_ib_cont_pages(*umem, addr, 0, npages, page_shift, ncont, NULL);
 
         err = mlx5_ib_get_buf_offset(addr, *page_shift, offset);
         if (err) {
@@ -728,7 +728,7 @@ static int create_user_rq(struct mlx5_ib_dev *dev, struct ib_pd *pd,
                 return err;
         }
 
-        mlx5_ib_cont_pages(rwq->umem, ucmd->buf_addr, &npages, &page_shift,
+        mlx5_ib_cont_pages(rwq->umem, ucmd->buf_addr, 0, &npages, &page_shift,
                            &ncont, NULL);
         err = mlx5_ib_get_buf_offset(ucmd->buf_addr, page_shift,
                                      &rwq->rq_page_offset);
diff --git a/drivers/infiniband/hw/mlx5/srq.c b/drivers/infiniband/hw/mlx5/srq.c
index 3857dbd9c956..f384db5367fb 100644
--- a/drivers/infiniband/hw/mlx5/srq.c
+++ b/drivers/infiniband/hw/mlx5/srq.c
@@ -118,7 +118,7 @@ static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
                 return err;
         }
 
-        mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
+        mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages,
                            &page_shift, &ncont, NULL);
         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
                                      &offset);