5.10-stable review patch. If anyone has any objections, please let me know.
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From: Kundan Kumar kundan.kumar@samsung.com
[ Upstream commit 1bd293fcf3af84674e82ed022c049491f3768840 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 5242feda5471a..a7131f4752e28 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -844,7 +844,8 @@ 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);