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IB: Refactor umem to use linear SG table

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This patch refactors the IB core umem code and vendor drivers to use a
linear (chained) SG table instead of chunk list.  With this change the
relevant code becomes clearer—no need for nested loops to build and
use umem.

Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Yishai Hadas
2014-01-28 13:40:15 +02:00
committed by Roland Dreier
parent cfbf8d4857
commit eeb8461e36
16 changed files with 446 additions and 550 deletions
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42
drivers/infiniband/hw/mthca/mthca_provider.c
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@@ -976,12 +976,12 @@ static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt, int acc, struct ib_udata *udata)
{
struct mthca_dev *dev = to_mdev(pd->device);
struct ib_umem_chunk *chunk;
struct scatterlist *sg;
struct mthca_mr *mr;
struct mthca_reg_mr ucmd;
u64 *pages;
int shift, n, len;
int i, j, k;
int i, k, entry;
int err = 0;
int write_mtt_size;
@@ -1009,10 +1009,7 @@ static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
}
shift = ffs(mr->umem->page_size) - 1;
n = 0;
list_for_each_entry(chunk, &mr->umem->chunk_list, list)
n += chunk->nents;
n = mr->umem->nmap;
mr->mtt = mthca_alloc_mtt(dev, n);
if (IS_ERR(mr->mtt)) {
@@ -1030,25 +1027,24 @@ static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
write_mtt_size = min(mthca_write_mtt_size(dev), (int) (PAGE_SIZE / sizeof *pages));
list_for_each_entry(chunk, &mr->umem->chunk_list, list)
for (j = 0; j < chunk->nmap; ++j) {
len = sg_dma_len(&chunk->page_list[j]) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] = sg_dma_address(&chunk->page_list[j]) +
mr->umem->page_size * k;
/*
* Be friendly to write_mtt and pass it chunks
* of appropriate size.
*/
if (i == write_mtt_size) {
err = mthca_write_mtt(dev, mr->mtt, n, pages, i);
if (err)
goto mtt_done;
n += i;
i = 0;
}
for_each_sg(mr->umem->sg_head.sgl, sg, mr->umem->nmap, entry) {
len = sg_dma_len(sg) >> shift;
for (k = 0; k < len; ++k) {
pages[i++] = sg_dma_address(sg) +
mr->umem->page_size * k;
/*
* Be friendly to write_mtt and pass it chunks
* of appropriate size.
*/
if (i == write_mtt_size) {
err = mthca_write_mtt(dev, mr->mtt, n, pages, i);
if (err)
goto mtt_done;
n += i;
i = 0;
}
}
}
if (i)
err = mthca_write_mtt(dev, mr->mtt, n, pages, i);