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| author | Sagi Grimberg <sagi@grimberg.me> | 2016-06-13 17:45:28 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-07-05 20:28:20 +0300 |
| commit | 038bd4cb6766c69b5b9c77507f389cc718a36842 (patch) | |
| tree | f551977e651401dadf30bb47bc9756df5f922901 /drivers/nvme/host/nvme.h | |
| parent | 7b89eae29eec4dd9259acd82ed57bec8d9e430ca (diff) | |
| download | linux-038bd4cb6766c69b5b9c77507f389cc718a36842.tar.xz | |
nvme: add keep-alive support
Periodic keep-alive is a mandatory feature in NVMe over Fabrics, and
optional in NVMe 1.2.1 for PCIe. This patch adds periodic keep-alive
sent from the host to verify that the controller is still responsive
and vice-versa. The keep-alive timeout is user-defined (with
keep_alive_tmo connection parameter) and defaults to 5 seconds.
In order to avoid a race condition where the host sends a keep-alive
competing with the target side keep-alive timeout expiration, the host
adds a grace period of 10 seconds when publishing the keep-alive timeout
to the target.
In case a keep-alive failed (or timed out), a transport specific error
recovery kicks in.
For now only NVMe over Fabrics is wired up to support keep alive, but
we can add PCIe support easily once controllers actually supporting it
become available.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Steve Wise <swise@chelsio.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme/host/nvme.h')
| -rw-r--r-- | drivers/nvme/host/nvme.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index ef28d4e33bf1..8d8cbc437699 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -38,6 +38,9 @@ extern unsigned char admin_timeout; extern unsigned char shutdown_timeout; #define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ) +#define NVME_DEFAULT_KATO 5 +#define NVME_KATO_GRACE 10 + enum { NVME_NS_LBA = 0, NVME_NS_LIGHTNVM = 1, @@ -109,10 +112,13 @@ struct nvme_ctrl { u8 vwc; u32 vs; u32 sgls; + u16 kas; + unsigned int kato; bool subsystem; unsigned long quirks; struct work_struct scan_work; struct work_struct async_event_work; + struct delayed_work ka_work; /* Fabrics only */ u16 sqsize; @@ -273,6 +279,8 @@ int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, dma_addr_t dma_addr, u32 *result); int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count); +void nvme_start_keep_alive(struct nvme_ctrl *ctrl); +void nvme_stop_keep_alive(struct nvme_ctrl *ctrl); struct sg_io_hdr; |