[PATCH V2] NVMe: Using PRACT bit to generate and verify PI by controller

[keith.busch@intel.com (Keith Busch)]

On Tue, 28 Jul 2015, Alok Pandey wrote:
> This patch enables the PRCHK and reftag support when PRACT bit is set, and
> block layer integrity is disabled.

Thanks!

Reviewed-by: Keith Busch <keith.busch at intel.com>

> Signed-off-by: Alok Pandey <pandey.alok at samsung.com>
> ---
> @@ -815,11 +815,10 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
> 	cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
> 	cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
>
> -	if (blk_integrity_rq(req)) {
> -		cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg));
> +	if (ns->ms) {
> 		switch (ns->pi_type) {
> 		case NVME_NS_DPS_PI_TYPE3:
> -			control |= NVME_RW_PRINFO_PRCHK_GUARD;
> +		control |= NVME_RW_PRINFO_PRCHK_GUARD;
> 			break;

Though the tab change here must have been an accident.