On Mon, May 06, 2019 at 08:53:37AM -0500, Shiraz Saleem wrote:
> Extend the DMA block iterator for HW that can support mixed
> block sizes. A bitmap of HW supported page sizes are provided
> to block iterator which returns contiguous aligned memory blocks
> within a HW supported page size.
>
> Signed-off-by: Shiraz Saleem <shiraz.saleem@xxxxxxxxx>
> drivers/infiniband/core/verbs.c | 38 ++++++++++++++++++++++++++++++++++++--
> include/rdma/ib_verbs.h | 18 ++++++++++++++----
> 2 files changed, 50 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index 3806038..fa9725d 100644
> +++ b/drivers/infiniband/core/verbs.c
> @@ -2712,16 +2712,47 @@ int rdma_init_netdev(struct ib_device *device, u8 port_num,
> }
> EXPORT_SYMBOL(rdma_init_netdev);
>
> +static unsigned int rdma_find_mixed_pg_bit(struct ib_block_iter *biter)
> +{
> + if (biter->__sg == biter->__sgl_head) {
> + return rdma_find_pg_bit(sg_dma_address(biter->__sg) +
> + sg_dma_len(biter->__sg),
> + biter->pgsz_bitmap);
> + } else if (sg_is_last(biter->__sg)) {
> + return rdma_find_pg_bit(sg_dma_address(biter->__sg),
> + biter->pgsz_bitmap);
> + } else {
> + unsigned int remaining =
> + sg_dma_address(biter->__sg) + sg_dma_len(biter->__sg) -
> + biter->__dma_addr;
> + unsigned int pg_bit = rdma_find_pg_bit(biter->__dma_addr,
> + biter->pgsz_bitmap);
> + if (remaining < BIT_ULL(biter->__pg_bit))
> + pg_bit = rdma_find_pg_bit(remaining,
> + biter->pgsz_bitmap);
I think this needs to follow the same basic algorithm as the single
bit case, considering the IOVA/etc.
But there is no user, so let us just drop this patch until a user
appears..
Jason
