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nvme: adjust multiples of NVME_CTRL_PAGE_SIZE in offset

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bio_vec start offset may be relatively large particularly when large
folio gets added to the bio. A bigger offset will result in avoiding the
single-segment mapping optimization and end up using expensive
mempool_alloc further.

Rather than using absolute value, adjust bv_offset by
NVME_CTRL_PAGE_SIZE while checking if segment can be fitted into one/two
PRP entries.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kundan Kumar <kundan.kumar@samsung.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Kundan Kumar 2024-05-23 17:01:49 +05:30 committed by Keith Busch
parent 64e3d02b43
commit 1bd293fcf3
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/host/pci.c
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@ -778,7 +778,8 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
struct bio_vec bv = req_bvec(req);
if (!is_pci_p2pdma_page(bv.bv_page)) {
if (bv.bv_offset + bv.bv_len <= NVME_CTRL_PAGE_SIZE * 2)
if ((bv.bv_offset & (NVME_CTRL_PAGE_SIZE - 1)) +
bv.bv_len <= NVME_CTRL_PAGE_SIZE * 2)
return nvme_setup_prp_simple(dev, req,
&cmnd->rw, &bv);