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nvmet: split log page implementation 

Remove the common code to allocate a buffer and copy it into the SGL.
Instead the two no-op implementations just zero the SGL directly, and
the smart log allocates a buffer on its own.  This prepares for the
more elaborate ANA log page.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
This commit is contained in:
Christoph Hellwig 2018-05-22 11:10:03 +02:00
parent c7759fff22
commit 8ab0805f11
1 changed files with 36 additions and 63 deletions
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99
drivers/nvme/target/admin-cmd.c
View File

@ -32,6 +32,11 @@ u32 nvmet_get_log_page_len(struct nvme_command *cmd)
return len;
}
static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
{
nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len));
}
static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
@ -97,74 +102,26 @@ static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
return NVME_SC_SUCCESS;
}
static u16 nvmet_get_smart_log(struct nvmet_req *req,
struct nvme_smart_log *slog)
static void nvmet_execute_get_log_page_smart(struct nvmet_req *req)
{
u16 status;
struct nvme_smart_log *log;
u16 status = NVME_SC_INTERNAL;
WARN_ON(req == NULL || slog == NULL);
if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
status = nvmet_get_smart_log_all(req, slog);
else
status = nvmet_get_smart_log_nsid(req, slog);
return status;
}
static void nvmet_execute_get_log_page(struct nvmet_req *req)
{
struct nvme_smart_log *smart_log;
size_t data_len = nvmet_get_log_page_len(req->cmd);
void *buf;
u16 status = 0;
buf = kzalloc(data_len, GFP_KERNEL);
if (!buf) {
status = NVME_SC_INTERNAL;
if (req->data_len != sizeof(*log))
goto out;
}
switch (req->cmd->get_log_page.lid) {
case NVME_LOG_ERROR:
/*
* We currently never set the More bit in the status field,
* so all error log entries are invalid and can be zeroed out.
* This is called a minum viable implementation (TM) of this
* mandatory log page.
*/
break;
case NVME_LOG_SMART:
/*
* XXX: fill out actual smart log
*
* We might have a hard time coming up with useful values for
* many of the fields, and even when we have useful data
* available (e.g. units or commands read/written) those aren't
* persistent over power loss.
*/
if (data_len != sizeof(*smart_log)) {
status = NVME_SC_INTERNAL;
goto err;
}
smart_log = buf;
status = nvmet_get_smart_log(req, smart_log);
if (status)
goto err;
break;
case NVME_LOG_FW_SLOT:
/*
* We only support a single firmware slot which always is
* active, so we can zero out the whole firmware slot log and
* still claim to fully implement this mandatory log page.
*/
break;
default:
BUG();
}
log = kzalloc(sizeof(*log), GFP_KERNEL);
if (!log)
goto out;
status = nvmet_copy_to_sgl(req, 0, buf, data_len);
if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
status = nvmet_get_smart_log_all(req, log);
else
status = nvmet_get_smart_log_nsid(req, log);
if (status)
goto out;
err:
kfree(buf);
status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
out:
nvmet_req_complete(req, status);
}
@ -566,9 +523,25 @@ u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
switch (cmd->get_log_page.lid) {
case NVME_LOG_ERROR:
/*
* We currently never set the More bit in the status
* field, so all error log entries are invalid and can
* be zeroed out. This is called a minum viable
* implementation (TM) of this mandatory log page.
*/
req->execute = nvmet_execute_get_log_page_noop;
return 0;
case NVME_LOG_SMART:
req->execute = nvmet_execute_get_log_page_smart;
return 0;
case NVME_LOG_FW_SLOT:
req->execute = nvmet_execute_get_log_page;
/*
* We only support a single firmware slot which always
* is active, so we can zero out the whole firmware slot
* log and still claim to fully implement this mandatory
* log page.
*/
req->execute = nvmet_execute_get_log_page_noop;
return 0;
}
break;