On 6/22/20 9:25 AM, Keith Busch wrote:
From: Niklas Cassel <niklas.cassel@xxxxxxx>
Implements support for the I/O Command Sets command set. The command set
introduces a method to enumerate multiple command sets per namespace. If
the command set is exposed, this method for enumeration will be used
instead of the traditional method that uses the CC.CSS register command
set register for command set identification.
For namespaces where the Command Set Identifier is not supported or
recognized, the specific namespace will not be created.
Reviewed-by: Javier González <javier.gonz@xxxxxxxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: Matias Bjørling <matias.bjorling@xxxxxxx>
Reviewed-by: Daniel Wagner <dwagner@xxxxxxx>
Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
---
drivers/nvme/host/core.c | 48 +++++++++++++++++++++++++++++++++-------
drivers/nvme/host/nvme.h | 1 +
include/linux/nvme.h | 19 ++++++++++++++--
3 files changed, 58 insertions(+), 10 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 9491dbcfe81a..45a3cb5a35bd 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1056,8 +1056,13 @@ static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
return error;
}
+static bool nvme_multi_css(struct nvme_ctrl *ctrl)
+{
+ return (ctrl->ctrl_config & NVME_CC_CSS_MASK) == NVME_CC_CSS_CSI;
+}
+
static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
- struct nvme_ns_id_desc *cur)
+ struct nvme_ns_id_desc *cur, bool *csi_seen)
{
const char *warn_str = "ctrl returned bogus length:";
void *data = cur;
@@ -1087,6 +1092,15 @@ static int nvme_process_ns_desc(struct nvme_ctrl *ctrl, struct nvme_ns_ids *ids,
}
uuid_copy(&ids->uuid, data + sizeof(*cur));
return NVME_NIDT_UUID_LEN;
+ case NVME_NIDT_CSI:
+ if (cur->nidl != NVME_NIDT_CSI_LEN) {
+ dev_warn(ctrl->device, "%s %d for NVME_NIDT_CSI\n",
+ warn_str, cur->nidl);
+ return -1;
+ }
+ memcpy(&ids->csi, data + sizeof(*cur), NVME_NIDT_CSI_LEN);
+ *csi_seen = true;
+ return NVME_NIDT_CSI_LEN;
default:
/* Skip unknown types */
return cur->nidl;
@@ -1097,10 +1111,9 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
struct nvme_ns_ids *ids)
{
struct nvme_command c = { };
- int status;
+ bool csi_seen = false;
+ int status, pos, len;
void *data;
- int pos;
- int len;
c.identify.opcode = nvme_admin_identify;
c.identify.nsid = cpu_to_le32(nsid);
@@ -1130,13 +1143,19 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
if (cur->nidl == 0)
break;
- len = nvme_process_ns_desc(ctrl, ids, cur);
+ len = nvme_process_ns_desc(ctrl, ids, cur, &csi_seen);
if (len < 0)
goto free_data;
len += sizeof(*cur);
}
free_data:
+ if (!status && nvme_multi_css(ctrl) && !csi_seen) {
We will clear the status if we detect a path error, that is to
avoid needlessly removing the ns for path failures, so you should
check at the goto site.
+ dev_warn(ctrl->device, "Command set not reported for nsid:%d\n",
+ nsid);
+ status = -EINVAL;
+ }
+
kfree(data);
return status;
}
@@ -1792,7 +1811,7 @@ static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
if (ctrl->vs >= NVME_VS(1, 2, 0))
memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
- if (ctrl->vs >= NVME_VS(1, 3, 0))
+ if (ctrl->vs >= NVME_VS(1, 3, 0) || nvme_multi_css(ctrl))
return nvme_identify_ns_descs(ctrl, nsid, ids);
return 0;
}
@@ -1808,7 +1827,8 @@ static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
{
return uuid_equal(&a->uuid, &b->uuid) &&
memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
- memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
+ memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0 &&
+ a->csi == b->csi;
}
static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
@@ -1930,6 +1950,15 @@ static int __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
if (ns->lba_shift == 0)
ns->lba_shift = 9;
+ switch (ns->head->ids.csi) {
+ case NVME_CSI_NVM:
+ break;
+ default:
+ dev_warn(ctrl->device, "unknown csi:%d ns:%d\n",
+ ns->head->ids.csi, ns->head->ns_id);
+ return -ENODEV;
+ }
Not sure we need a switch-case statement for a single case target...
