Commit 33cfdc2a authored by Max Gurtovoy's avatar Max Gurtovoy Committed by Christoph Hellwig
Browse files

nvme: enforce extended LBA format for fabrics metadata 



An extended LBA is a larger LBA that is created when metadata associated
with the LBA is transferred contiguously with the LBA data (AKA
interleaved). The metadata may be either transferred as part of the LBA
(creating an extended LBA) or it may be transferred as a separate
contiguous buffer of data. According to the NVMeoF spec, a fabrics ctrl
supports only an Extended LBA format. Fail revalidation in case we have a
spec violation. Also add a flag that will imply on capable transports and
controllers as part of a preparation for allowing end-to-end protection
information for fabric controllers.

Suggested-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMax Gurtovoy <maxg@mellanox.com>
Signed-off-by: default avatarIsrael Rukshin <israelr@mellanox.com>
Reviewed-by: default avatarJames Smart <james.smart@broadcom.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 95093350

drivers/nvme/host/core.c

+27 −14
Original line number Diff line number Diff line
@@ -1916,9 +1916,10 @@ static void nvme_update_disk_info(struct gendisk *disk, 
	blk_mq_unfreeze_queue(disk->queue);

}



static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)

static int __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)

{

	struct nvme_ns *ns = disk->private_data;

	struct nvme_ctrl *ctrl = ns->ctrl;

	u32 iob;



	/*
@@ -1929,9 +1930,9 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) 
	if (ns->lba_shift == 0)

		ns->lba_shift = 9;



	if ((ns->ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&

	    is_power_of_2(ns->ctrl->max_hw_sectors))

		iob = ns->ctrl->max_hw_sectors;

	if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&

	    is_power_of_2(ctrl->max_hw_sectors))

		iob = ctrl->max_hw_sectors;

	else

		iob = nvme_lba_to_sect(ns, le16_to_cpu(id->noiob));
@@ -1944,16 +1945,24 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) 
		ns->pi_type = 0;



	if (ns->ms) {

		if (id->flbas & NVME_NS_FLBAS_META_EXT)

			ns->features |= NVME_NS_EXT_LBAS;



		/*

		 * For PCI, Extended logical block will be generated by the

		 * controller. Non-extended format can be generated by the

		 * block layer.

		 * For PCIe only the separate metadata pointer is supported,

		 * as the block layer supplies metadata in a separate bio_vec

		 * chain. For Fabrics, only metadata as part of extended data

		 * LBA is supported on the wire per the Fabrics specification,

		 * but the HBA/HCA will do the remapping from the separate

		 * metadata buffers for us.

		 */

		if (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED) {

			if (!(ns->features & NVME_NS_EXT_LBAS))

		if (id->flbas & NVME_NS_FLBAS_META_EXT) {

			ns->features |= NVME_NS_EXT_LBAS;

			if ((ctrl->ops->flags & NVME_F_FABRICS) &&

			    (ctrl->ops->flags & NVME_F_METADATA_SUPPORTED) &&

			    ctrl->max_integrity_segments)

				ns->features |= NVME_NS_METADATA_SUPPORTED;

		} else {

			if (WARN_ON_ONCE(ctrl->ops->flags & NVME_F_FABRICS))

				return -EINVAL;

			if (ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)

				ns->features |= NVME_NS_METADATA_SUPPORTED;

		}

	}
@@ -1968,6 +1977,7 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) 
		revalidate_disk(ns->head->disk);

	}

#endif

	return 0;

}



static int nvme_revalidate_disk(struct gendisk *disk)
@@ -2003,7 +2013,7 @@ static int nvme_revalidate_disk(struct gendisk *disk) 
		goto free_id;

	}



	__nvme_revalidate_disk(disk, id);

	ret = __nvme_revalidate_disk(disk, id);

free_id:

	kfree(id);

out:
@@ -3657,7 +3667,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) 
	memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);

	ns->disk = disk;



	__nvme_revalidate_disk(disk, id);

	if (__nvme_revalidate_disk(disk, id))

		goto out_free_disk;



	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {

		ret = nvme_nvm_register(ns, disk_name, node);
@@ -3684,6 +3695,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) 
	/* prevent double queue cleanup */

	ns->disk->queue = NULL;

	put_disk(ns->disk);

 out_free_disk:

	del_gendisk(ns->disk);

 out_unlink_ns:

	mutex_lock(&ctrl->subsys->lock);

	list_del_rcu(&ns->siblings);

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