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nvmet: add metadata/T10-PI support

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Expose the namespace metadata format when PI is enabled. The user needs
to enable the capability per subsystem and per port. The other metadata
properties are taken from the namespace/bdev.

Usage example:
echo 1 > /config/nvmet/subsystems/${NAME}/attr_pi_enable
echo 1 > /config/nvmet/ports/${PORT_NUM}/param_pi_enable

Signed-off-by: Israel Rukshin <israelr@mellanox.com>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Israel Rukshin 2020-05-19 17:06:01 +03:00 • committed by Christoph Hellwig
parent 39481fbd14
commit ea52ac1c66
5 changed files with 121 additions and 10 deletions
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26
drivers/nvme/target/admin-cmd.c
View file

@ -341,6 +341,7 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvme_id_ctrl *id;
u32 cmd_capsule_size;
u16 status = 0;
id = kzalloc(sizeof(*id), GFP_KERNEL);
@ -433,9 +434,15 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
/* Max command capsule size is sqe + single page of in-capsule data */
id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
req->port->inline_data_size) / 16);
/*
* Max command capsule size is sqe + in-capsule data size.
* Disable in-capsule data for Metadata capable controllers.
*/
cmd_capsule_size = sizeof(struct nvme_command);
if (!ctrl->pi_support)
cmd_capsule_size += req->port->inline_data_size;
id->ioccsz = cpu_to_le32(cmd_capsule_size / 16);
/* Max response capsule size is cqe */
id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
@ -465,6 +472,7 @@ out:
static void nvmet_execute_identify_ns(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvmet_ns *ns;
struct nvme_id_ns *id;
u16 status = 0;
@ -482,7 +490,7 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
}
/* return an all zeroed buffer if we can't find an active namespace */
ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
ns = nvmet_find_namespace(ctrl, req->cmd->identify.nsid);
if (!ns)
goto done;
@ -523,6 +531,16 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
id->lbaf[0].ds = ns->blksize_shift;
if (ctrl->pi_support && nvmet_ns_has_pi(ns)) {
id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST |
NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 |
NVME_NS_DPC_PI_TYPE3;
id->mc = NVME_MC_EXTENDED_LBA;
id->dps = ns->pi_type;
id->flbas = NVME_NS_FLBAS_META_EXT;
id->lbaf[0].ms = cpu_to_le16(ns->metadata_size);
}
if (ns->readonly)
id->nsattr |= (1 << 0);
nvmet_put_namespace(ns);