diff options
| author | Sagi Grimberg <sagi@grimberg.me> | 2017-03-18 20:52:36 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-04-04 09:48:23 -0600 |
| commit | 42a45274c225829637b585e1c994a68f59507108 (patch) | |
| tree | df6fd42ca4b5d340776dfe6244faf6c1477487dd /drivers/nvme/host/fabrics.h | |
| parent | 7777bdedf31d674c4fd5ebbfbd27a6a6ae0a17e0 (diff) | |
nvme-fabrics: Allow ctrl loss timeout configuration
When a host sense that its controller session is damaged,
it tries to re-establish it periodically (reconnect every
reconnect_delay). It may very well be that the controller
is gone and never coming back, in this case the host will
try to reconnect forever.
Add a ctrl_loss_tmo to bound the number of reconnect attempts
to a specific controller (default to a reasonable 10 minutes).
The timeout configuration is actually translated into number of
reconnect attempts and not a schedule on its own but rather
divided with reconnect_delay. This is useful to prevent
racing flows of remove and reconnect, and it doesn't really
matter if we remove slightly sooner than what the user requested.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme/host/fabrics.h')
| -rw-r--r-- | drivers/nvme/host/fabrics.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h index 156018182ce4..f5a9c1fb186f 100644 --- a/drivers/nvme/host/fabrics.h +++ b/drivers/nvme/host/fabrics.h @@ -21,6 +21,8 @@ #define NVMF_MAX_QUEUE_SIZE 1024 #define NVMF_DEF_QUEUE_SIZE 128 #define NVMF_DEF_RECONNECT_DELAY 10 +/* default to 600 seconds of reconnect attempts before giving up */ +#define NVMF_DEF_CTRL_LOSS_TMO 600 /* * Define a host as seen by the target. We allocate one at boot, but also @@ -53,6 +55,7 @@ enum { NVMF_OPT_HOSTNQN = 1 << 8, NVMF_OPT_RECONNECT_DELAY = 1 << 9, NVMF_OPT_HOST_TRADDR = 1 << 10, + NVMF_OPT_CTRL_LOSS_TMO = 1 << 11, }; /** @@ -77,6 +80,10 @@ enum { * @discovery_nqn: indicates if the subsysnqn is the well-known discovery NQN. * @kato: Keep-alive timeout. * @host: Virtual NVMe host, contains the NQN and Host ID. + * @nr_reconnects: number of reconnect attempted since the last ctrl failure + * @max_reconnects: maximum number of allowed reconnect attempts before removing + * the controller, (-1) means reconnect forever, zero means remove + * immediately; */ struct nvmf_ctrl_options { unsigned mask; @@ -91,6 +98,8 @@ struct nvmf_ctrl_options { bool discovery_nqn; unsigned int kato; struct nvmf_host *host; + int nr_reconnects; + int max_reconnects; }; /* @@ -133,5 +142,6 @@ void nvmf_unregister_transport(struct nvmf_transport_ops *ops); void nvmf_free_options(struct nvmf_ctrl_options *opts); const char *nvmf_get_subsysnqn(struct nvme_ctrl *ctrl); int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size); +bool nvmf_should_reconnect(struct nvme_ctrl *ctrl); #endif /* _NVME_FABRICS_H */ |