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nvmet/fc: Use sgl_alloc() and sgl_free()

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Use the sgl_alloc() and sgl_free() functions instead of open coding
these functions.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by:  James Smart <james.smart@broadcom.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2018-01-05 08:26:48 -08:00 committed by Jens Axboe
parent 8cd579d279
commit 4442b56fb5
2 changed files with 3 additions and 34 deletions
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1
drivers/nvme/target/Kconfig
View file

@ -39,6 +39,7 @@ config NVME_TARGET_FC
tristate "NVMe over Fabrics FC target driver"
depends on NVME_TARGET
depends on HAS_DMA
select SGL_ALLOC
help
This enables the NVMe FC target support, which allows exporting NVMe
devices over FC.

36
drivers/nvme/target/fc.c
View file

@ -1697,31 +1697,12 @@ static int
nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
{
struct scatterlist *sg;
struct page *page;
unsigned int nent;
u32 page_len, length;
int i = 0;
length = fod->req.transfer_len;
nent = DIV_ROUND_UP(length, PAGE_SIZE);
sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent);
if (!sg)
goto out;
sg_init_table(sg, nent);
while (length) {
page_len = min_t(u32, length, PAGE_SIZE);
page = alloc_page(GFP_KERNEL);
if (!page)
goto out_free_pages;
sg_set_page(&sg[i], page, page_len, 0);
length -= page_len;
i++;
}
fod->data_sg = sg;
fod->data_sg_cnt = nent;
fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent,
@ -1731,14 +1712,6 @@ nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
return 0;
out_free_pages:
while (i > 0) {
i--;
__free_page(sg_page(&sg[i]));
}
kfree(sg);
fod->data_sg = NULL;
fod->data_sg_cnt = 0;
out:
return NVME_SC_INTERNAL;
}
@ -1746,18 +1719,13 @@ nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
static void
nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
{
struct scatterlist *sg;
int count;
if (!fod->data_sg || !fod->data_sg_cnt)
return;
fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt,
((fod->io_dir == NVMET_FCP_WRITE) ?
DMA_FROM_DEVICE : DMA_TO_DEVICE));
for_each_sg(fod->data_sg, sg, fod->data_sg_cnt, count)
__free_page(sg_page(sg));
kfree(fod->data_sg);
sgl_free(fod->data_sg);
fod->data_sg = NULL;
fod->data_sg_cnt = 0;
}