nvme-fabrics: refactor queue ready check

Move the is_connected check to the fibre channel transport, as it has no
meaning for other transports.  To facilitate this split out a new
nvmf_fail_nonready_command helper that is called by the transport when
it is asked to handle a command on a queue that is not ready.

Also avoid a function call for the queue live fast path by inlining
the check.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: James Smart <james.smart@broadcom.com>
This commit is contained in:
Christoph Hellwig
2018-06-11 17:34:06 +02:00
parent e6c3456aa8
commit 3bc32bb118
5 changed files with 45 additions and 50 deletions

View File

@@ -536,30 +536,32 @@ static struct nvmf_transport_ops *nvmf_lookup_transport(
return NULL;
}
blk_status_t nvmf_check_if_ready(struct nvme_ctrl *ctrl, struct request *rq,
bool queue_live, bool is_connected)
/*
* For something we're not in a state to send to the device the default action
* is to busy it and retry it after the controller state is recovered. However,
* anything marked for failfast or nvme multipath is immediately failed.
*
* Note: commands used to initialize the controller will be marked for failfast.
* Note: nvme cli/ioctl commands are marked for failfast.
*/
blk_status_t nvmf_fail_nonready_command(struct request *rq)
{
if (!blk_noretry_request(rq) && !(rq->cmd_flags & REQ_NVME_MPATH))
return BLK_STS_RESOURCE;
nvme_req(rq)->status = NVME_SC_ABORT_REQ;
return BLK_STS_IOERR;
}
EXPORT_SYMBOL_GPL(nvmf_fail_nonready_command);
bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
bool queue_live)
{
struct nvme_command *cmd = nvme_req(rq)->cmd;
if (likely(ctrl->state == NVME_CTRL_LIVE && is_connected))
return BLK_STS_OK;
switch (ctrl->state) {
case NVME_CTRL_NEW:
case NVME_CTRL_CONNECTING:
case NVME_CTRL_DELETING:
/*
* This is the case of starting a new or deleting an association
* but connectivity was lost before it was fully created or torn
* down. We need to error the commands used to initialize the
* controller so the reconnect can go into a retry attempt. The
* commands should all be marked REQ_FAILFAST_DRIVER, which will
* hit the reject path below. Anything else will be queued while
* the state settles.
*/
if (!is_connected)
break;
/*
* If queue is live, allow only commands that are internally
* generated pass through. These are commands on the admin
@@ -567,7 +569,7 @@ blk_status_t nvmf_check_if_ready(struct nvme_ctrl *ctrl, struct request *rq,
* ioctl admin cmds received while initializing.
*/
if (queue_live && !(nvme_req(rq)->flags & NVME_REQ_USERCMD))
return BLK_STS_OK;
return true;
/*
* If the queue is not live, allow only a connect command. This
@@ -577,26 +579,13 @@ blk_status_t nvmf_check_if_ready(struct nvme_ctrl *ctrl, struct request *rq,
if (!queue_live && blk_rq_is_passthrough(rq) &&
cmd->common.opcode == nvme_fabrics_command &&
cmd->fabrics.fctype == nvme_fabrics_type_connect)
return BLK_STS_OK;
break;
return true;
return false;
default:
break;
return false;
}
/*
* Any other new io is something we're not in a state to send to the
* device. Default action is to busy it and retry it after the
* controller state is recovered. However, anything marked for failfast
* or nvme multipath is immediately failed. Note: commands used to
* initialize the controller will be marked for failfast.
* Note: nvme cli/ioctl commands are marked for failfast.
*/
if (!blk_noretry_request(rq) && !(rq->cmd_flags & REQ_NVME_MPATH))
return BLK_STS_RESOURCE;
nvme_req(rq)->status = NVME_SC_ABORT_REQ;
return BLK_STS_IOERR;
}
EXPORT_SYMBOL_GPL(nvmf_check_if_ready);
EXPORT_SYMBOL_GPL(__nvmf_check_ready);
static const match_table_t opt_tokens = {
{ NVMF_OPT_TRANSPORT, "transport=%s" },