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nvme: remove virtual boundary for sgl capable devices

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The nvme virtual boundary is only required for the PRP format. Devices
that can use SGL for DMA don't need it for IO queues. Drop reporting it
for such devices; rdma fabrics controllers will continue to use the
limit as they currently don't report any boundary requirements, but tcp
and fc never needed it in the first place so they get to report no
virtual boundary.

Applications may continue to align to the same virtual boundaries for
optimization purposes if they want, and the driver will continue to
decide whether to use the PRP format the same as before if the IO allows
it.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2025-10-14 08:04:56 -07:00
committed by Jens Axboe
parent 2f6b2565d4
commit bc840b21a2
9 changed files with 48 additions and 8 deletions
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7
drivers/nvme/host/nvme.h
View File

@@ -558,6 +558,12 @@ static inline bool nvme_ns_has_pi(struct nvme_ns_head *head)
return head->pi_type && head->ms == head->pi_size;
}
static inline unsigned long nvme_get_virt_boundary(struct nvme_ctrl *ctrl,
bool is_admin)
{
return NVME_CTRL_PAGE_SIZE - 1;
}
struct nvme_ctrl_ops {
const char *name;
struct module *module;
@@ -578,6 +584,7 @@ struct nvme_ctrl_ops {
int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
void (*print_device_info)(struct nvme_ctrl *ctrl);
bool (*supports_pci_p2pdma)(struct nvme_ctrl *ctrl);
unsigned long (*get_virt_boundary)(struct nvme_ctrl *ctrl, bool is_admin);
};
/*