diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2020-10-16 16:19:04 -0600 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-10-22 15:27:57 +0200 |
| commit | df06047d54276f73782c9d97882b305fca745d3f (patch) | |
| tree | a000029e08e4d4f58053060aa1e9e85a84d7d6d6 /drivers/nvme | |
| parent | 85bd23f3dc09a2ae9e56885420e52c54bf983713 (diff) | |
nvmet: limit passthru MTDS by BIO_MAX_PAGES
nvmet_passthru_map_sg() only supports mapping a single BIO, not a chain
so the effective maximum transfer should also be limitted by
BIO_MAX_PAGES (presently this works out to 1MB).
For PCI passthru devices the max_sectors would typically be more
limitting than BIO_MAX_PAGES, but this may not be true for all passthru
devices.
Fixes: c1fef73f793b ("nvmet: add passthru code to process commands")
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/target/passthru.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c index 56c571052216..323046e1d67f 100644 --- a/drivers/nvme/target/passthru.c +++ b/drivers/nvme/target/passthru.c @@ -26,7 +26,7 @@ static u16 nvmet_passthru_override_id_ctrl(struct nvmet_req *req) struct nvme_ctrl *pctrl = ctrl->subsys->passthru_ctrl; u16 status = NVME_SC_SUCCESS; struct nvme_id_ctrl *id; - u32 max_hw_sectors; + int max_hw_sectors; int page_shift; id = kzalloc(sizeof(*id), GFP_KERNEL); @@ -48,6 +48,13 @@ static u16 nvmet_passthru_override_id_ctrl(struct nvmet_req *req) max_hw_sectors = min_not_zero(pctrl->max_segments << (PAGE_SHIFT - 9), pctrl->max_hw_sectors); + /* + * nvmet_passthru_map_sg is limitted to using a single bio so limit + * the mdts based on BIO_MAX_PAGES as well + */ + max_hw_sectors = min_not_zero(BIO_MAX_PAGES << (PAGE_SHIFT - 9), + max_hw_sectors); + page_shift = NVME_CAP_MPSMIN(ctrl->cap) + 12; id->mdts = ilog2(max_hw_sectors) + 9 - page_shift; |