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RDMA/cxgb3: Use for_each_sg_dma_page iterator on umem SGL 

Use the for_each_sg_dma_page iterator variant to walk the umem DMA-mapped
SGL and get the page DMA address. This avoids the extra loop to iterate
pages in the SGE when for_each_sg iterator is used.

Additionally, purge umem->page_shift usage in the driver as its only
relevant for ODP MRs. Use system page size and shift instead.

Signed-off-by: Shiraz, Saleem <shiraz.saleem@intel.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Shiraz, Saleem 2019-02-11 09:25:02 -06:00 committed by Jason Gunthorpe
parent 48b586ac36
commit b44e47eb06
1 changed files with 12 additions and 17 deletions
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29
drivers/infiniband/hw/cxgb3/iwch_provider.c
View File

@ -516,14 +516,13 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt, int acc, struct ib_udata *udata)
{
__be64 *pages;
int shift, n, len;
int i, k, entry;
int shift, n, i;
int err = 0;
struct iwch_dev *rhp;
struct iwch_pd *php;
struct iwch_mr *mhp;
struct iwch_reg_user_mr_resp uresp;
struct scatterlist *sg;
struct sg_dma_page_iter sg_iter;
pr_debug("%s ib_pd %p\n", __func__, pd);
php = to_iwch_pd(pd);
@ -541,7 +540,7 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
return ERR_PTR(err);
}
shift = mhp->umem->page_shift;
shift = PAGE_SHIFT;
n = mhp->umem->nmap;
@ -557,19 +556,15 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
i = n = 0;
for_each_sg(mhp->umem->sg_head.sgl, sg, mhp->umem->nmap, entry) {
len = sg_dma_len(sg) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] = cpu_to_be64(sg_dma_address(sg) +
(k << shift));
if (i == PAGE_SIZE / sizeof *pages) {
err = iwch_write_pbl(mhp, pages, i, n);
if (err)
goto pbl_done;
n += i;
i = 0;
}
}
for_each_sg_dma_page(mhp->umem->sg_head.sgl, &sg_iter, mhp->umem->nmap, 0) {
pages[i++] = cpu_to_be64(sg_page_iter_dma_address(&sg_iter));
if (i == PAGE_SIZE / sizeof *pages) {
err = iwch_write_pbl(mhp, pages, i, n);
if (err)
goto pbl_done;
n += i;
i = 0;
}
}
if (i)