nvme: add new reconnecting controller state

The nvme fabric (RDMA, FC, etc...) can introduce port, link or node
failures that may require a reconnect to re-establish the connection.

Add a new reconnecting state that will initially be used by the RDMA
driver.

Reviewed-by: Jay Freyensee <james.p.freyensee@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c01687d..4babdf0 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -88,6 +88,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
                switch (old_state) {
                case NVME_CTRL_NEW:
                case NVME_CTRL_RESETTING:
+               case NVME_CTRL_RECONNECTING:
                        changed = true;
                        /* FALLTHRU */
                default:
@@ -98,6 +99,16 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
                switch (old_state) {
                case NVME_CTRL_NEW:
                case NVME_CTRL_LIVE:
+               case NVME_CTRL_RECONNECTING:
+                       changed = true;
+                       /* FALLTHRU */
+               default:
+                       break;
+               }
+               break;
+       case NVME_CTRL_RECONNECTING:
+               switch (old_state) {
+               case NVME_CTRL_LIVE:
                        changed = true;
                        /* FALLTHRU */
                default:
@@ -108,6 +119,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
                switch (old_state) {
                case NVME_CTRL_LIVE:
                case NVME_CTRL_RESETTING:
+               case NVME_CTRL_RECONNECTING:
                        changed = true;
                        /* FALLTHRU */
                default:

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 8d8cbc4..abe83b4 100644 (file)
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -74,6 +74,7 @@ enum nvme_ctrl_state {
        NVME_CTRL_NEW,
        NVME_CTRL_LIVE,
        NVME_CTRL_RESETTING,
+       NVME_CTRL_RECONNECTING,
        NVME_CTRL_DELETING,
        NVME_CTRL_DEAD,
 };