Add a new controller flag, NVME_CTRL_MARGINAL, to help multipath I/O
policies to react to a path that is set to a "marginal" state.
The flag is cleared on controller reset, which is often the case when
faulty cabling or transceiver hardware is replaced.
Signed-off-by: Bryan Gurney <bgur...@redhat.com>
---
drivers/nvme/host/core.c | 1 +
drivers/nvme/host/nvme.h | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 812c1565114f..fafbd5c9c53d 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -5069,6 +5069,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device
*dev,
WRITE_ONCE(ctrl->state, NVME_CTRL_NEW);
ctrl->passthru_err_log_enabled = false;
clear_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags);
+ clear_bit(NVME_CTRL_MARGINAL, &ctrl->flags);
spin_lock_init(&ctrl->lock);
mutex_init(&ctrl->namespaces_lock);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index cfd2b5b90b91..d71e6668f11c 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -275,6 +275,7 @@ enum nvme_ctrl_flags {
NVME_CTRL_SKIP_ID_CNS_CS = 4,
NVME_CTRL_DIRTY_CAPABILITY = 5,
NVME_CTRL_FROZEN = 6,
+ NVME_CTRL_MARGINAL = 7,
};
struct nvme_ctrl {
@@ -417,6 +418,11 @@ static inline enum nvme_ctrl_state nvme_ctrl_state(struct
nvme_ctrl *ctrl)
return READ_ONCE(ctrl->state);
}
+static inline bool nvme_ctrl_is_marginal(struct nvme_ctrl *ctrl)
+{
+ return test_bit(NVME_CTRL_MARGINAL, &ctrl->flags);
+}
+
enum nvme_iopolicy {
NVME_IOPOLICY_NUMA,
NVME_IOPOLICY_RR,
--
2.50.1
