summaryrefslogtreecommitdiff
path: root/drivers/net/mlx4
diff options
context:
space:
mode:
authorJack Morgenstein <jackm@dev.mellanox.co.il>2008-01-28 10:40:51 +0200
committerRoland Dreier <rolandd@cisco.com>2008-02-06 21:17:45 -0800
commit313abe55a87bc10e55d00f337d609e17ad5f8c9a (patch)
tree833ff3c4b33f83d4ca64ed322c2d8efa21529d71 /drivers/net/mlx4
parent1c69fc2a9012e160c8d459f63df74a6b01db8322 (diff)
mlx4_core: For 64-bit systems, vmap() kernel queue buffers
Since kernel virtual memory is not a problem on 64-bit systems, there is no reason to use our own 2-layer page mapping scheme for large kernel queue buffers on such systems. Instead, map the page list to a single virtually contiguous buffer with vmap(), so that can we access buffer memory via direct indexing. Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il> Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/net/mlx4')
-rw-r--r--drivers/net/mlx4/alloc.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/mlx4/alloc.c b/drivers/net/mlx4/alloc.c
index b226e019bc8b..2da2c2ec1f22 100644
--- a/drivers/net/mlx4/alloc.c
+++ b/drivers/net/mlx4/alloc.c
@@ -151,6 +151,19 @@ int mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct,
memset(buf->u.page_list[i].buf, 0, PAGE_SIZE);
}
+
+ if (BITS_PER_LONG == 64) {
+ struct page **pages;
+ pages = kmalloc(sizeof *pages * buf->nbufs, GFP_KERNEL);
+ if (!pages)
+ goto err_free;
+ for (i = 0; i < buf->nbufs; ++i)
+ pages[i] = virt_to_page(buf->u.page_list[i].buf);
+ buf->u.direct.buf = vmap(pages, buf->nbufs, VM_MAP, PAGE_KERNEL);
+ kfree(pages);
+ if (!buf->u.direct.buf)
+ goto err_free;
+ }
}
return 0;
@@ -170,6 +183,9 @@ void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf)
dma_free_coherent(&dev->pdev->dev, size, buf->u.direct.buf,
buf->u.direct.map);
else {
+ if (BITS_PER_LONG == 64)
+ vunmap(buf->u.direct.buf);
+
for (i = 0; i < buf->nbufs; ++i)
if (buf->u.page_list[i].buf)
dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,