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>

5 files changed, 45 insertions, 50 deletions

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index fa32c1216409..6b4e253b9347 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -536,38 +536,40 @@ 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)
 {
-        struct nvme_command *cmd = nvme_req(rq)->cmd;
+        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);
 
-        if (likely(ctrl->state == NVME_CTRL_LIVE && is_connected))
-                return BLK_STS_OK;
+bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
+                bool queue_live)
+{
+        struct nvme_command *cmd = nvme_req(rq)->cmd;
 
         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
                  * queue to initialize the controller. This will reject any
                  * 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"          },
diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h
index 7491a0bbf711..2ea949a3868c 100644
--- a/drivers/nvme/host/fabrics.h
+++ b/drivers/nvme/host/fabrics.h
@@ -162,7 +162,16 @@ void nvmf_unregister_transport(struct nvmf_transport_ops *ops);
 void nvmf_free_options(struct nvmf_ctrl_options *opts);
 int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size);
 bool nvmf_should_reconnect(struct nvme_ctrl *ctrl);
-blk_status_t nvmf_check_if_ready(struct nvme_ctrl *ctrl,
-        struct request *rq, bool queue_live, bool is_connected);
+blk_status_t nvmf_fail_nonready_command(struct request *rq);
+bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
+                bool queue_live);
+
+static inline bool nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
+                bool queue_live)
+{
+        if (likely(ctrl->state == NVME_CTRL_LIVE))
+                return true;
+        return __nvmf_check_ready(ctrl, rq, queue_live);
+}
 
 #endif /* _NVME_FABRICS_H */
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 318e827e74ec..b528a2f5826c 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2266,14 +2266,13 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
         struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
         struct nvme_command *sqe = &cmdiu->sqe;
         enum nvmefc_fcp_datadir io_dir;
+        bool queue_ready = test_bit(NVME_FC_Q_LIVE, &queue->flags);
         u32 data_len;
         blk_status_t ret;
 
-        ret = nvmf_check_if_ready(&queue->ctrl->ctrl, rq,
-                test_bit(NVME_FC_Q_LIVE, &queue->flags),
-                ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE);
-        if (unlikely(ret))
-                return ret;
+        if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE ||
+            !nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
+                return nvmf_fail_nonready_command(rq);
 
         ret = nvme_setup_cmd(ns, rq, sqe);
         if (ret)
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 7cd4199db225..c9424da0d23e 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1630,15 +1630,14 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
         struct nvme_rdma_qe *sqe = &req->sqe;
         struct nvme_command *c = sqe->data;
         struct ib_device *dev;
+        bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
         blk_status_t ret;
         int err;
 
         WARN_ON_ONCE(rq->tag < 0);
 
-        ret = nvmf_check_if_ready(&queue->ctrl->ctrl, rq,
-                test_bit(NVME_RDMA_Q_LIVE, &queue->flags), true);
-        if (unlikely(ret))
-                return ret;
+        if (!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
+                return nvmf_fail_nonready_command(rq);
 
         dev = queue->device->dev;
         ib_dma_sync_single_for_cpu(dev, sqe->dma,
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 1304ec3a7ede..d8d91f04bd7e 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -158,12 +158,11 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
         struct nvme_loop_queue *queue = hctx->driver_data;
         struct request *req = bd->rq;
         struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
+        bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags);
         blk_status_t ret;
 
-        ret = nvmf_check_if_ready(&queue->ctrl->ctrl, req,
-                test_bit(NVME_LOOP_Q_LIVE, &queue->flags), true);
-        if (unlikely(ret))
-                return ret;
+        if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready))
+                return nvmf_fail_nonready_command(req);
 
         ret = nvme_setup_cmd(ns, req, &iod->cmd);
         if (ret)