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nvme: Use CNS as 8-bit field and avoid endianness conversion 

This patch defines CNS field as 8-bit field and avoids cpu_to/from_le
conversions.
Also initialize nvme_command cns value explicitly to NVME_ID_CNS_NS
for readability (don't rely on the fact that NVME_ID_CNS_NS = 0).

Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Parav Pandit 2017-01-26 17:17:28 +02:00 committed by Jens Axboe
parent 778f067c18
commit 986994a275
4 changed files with 9 additions and 6 deletions
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5
drivers/nvme/host/core.c
View File

@ -560,7 +560,7 @@ int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
c.identify.opcode = nvme_admin_identify;
c.identify.cns = cpu_to_le32(NVME_ID_CNS_CTRL);
c.identify.cns = NVME_ID_CNS_CTRL;
*id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
if (!*id)
@ -578,7 +578,7 @@ static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *n
struct nvme_command c = { };
c.identify.opcode = nvme_admin_identify;
c.identify.cns = cpu_to_le32(NVME_ID_CNS_NS_ACTIVE_LIST);
c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
c.identify.nsid = cpu_to_le32(nsid);
return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
}
@ -592,6 +592,7 @@ int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
c.identify.opcode = nvme_admin_identify;
c.identify.nsid = cpu_to_le32(nsid);
c.identify.cns = NVME_ID_CNS_NS;
*id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
if (!*id)

2
drivers/nvme/target/admin-cmd.c
View File

@ -509,7 +509,7 @@ int nvmet_parse_admin_cmd(struct nvmet_req *req)
break;
case nvme_admin_identify:
req->data_len = 4096;
switch (le32_to_cpu(cmd->identify.cns)) {
switch (cmd->identify.cns) {
case NVME_ID_CNS_NS:
req->execute = nvmet_execute_identify_ns;
return 0;

4
drivers/nvme/target/discovery.c
View File

@ -186,14 +186,14 @@ int nvmet_parse_discovery_cmd(struct nvmet_req *req)
}
case nvme_admin_identify:
req->data_len = 4096;
switch (le32_to_cpu(cmd->identify.cns)) {
switch (cmd->identify.cns) {
case NVME_ID_CNS_CTRL:
req->execute =
nvmet_execute_identify_disc_ctrl;
return 0;
default:
pr_err("nvmet: unsupported identify cns %d\n",
le32_to_cpu(cmd->identify.cns));
cmd->identify.cns);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
default:

4
include/linux/nvme.h
View File

@ -644,7 +644,9 @@ struct nvme_identify {
__le32 nsid;
__u64 rsvd2[2];
union nvme_data_ptr dptr;
__le32 cns;
__u8 cns;
__u8 rsvd3;
__le16 ctrlid;
__u32 rsvd11[5];
};