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RDMA/cxgb4: 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 09:25:01 -06:00 committed by Jason Gunthorpe
parent 3856ec5527
commit 48b586ac36
1 changed files with 13 additions and 19 deletions
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20
drivers/infiniband/hw/cxgb4/mem.c
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@ -502,10 +502,9 @@ struct ib_mr *c4iw_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 = -ENOMEM;
struct scatterlist *sg;
struct sg_dma_page_iter sg_iter;
struct c4iw_dev *rhp;
struct c4iw_pd *php;
struct c4iw_mr *mhp;
@ -541,7 +540,7 @@ struct ib_mr *c4iw_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
if (IS_ERR(mhp->umem))
goto err_free_skb;
shift = mhp->umem->page_shift;
shift = PAGE_SHIFT;
n = mhp->umem->nmap;
err = alloc_pbl(mhp, n);
@ -556,14 +555,10 @@ struct ib_mr *c4iw_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 = write_pbl(&mhp->rhp->rdev,
pages,
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 = write_pbl(&mhp->rhp->rdev, pages,
mhp->attr.pbl_addr + (n << 3), i,
mhp->wr_waitp);
if (err)
@ -572,7 +567,6 @@ struct ib_mr *c4iw_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
i = 0;
}
}
}
if (i)
err = write_pbl(&mhp->rhp->rdev, pages,