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nvmet: add get_max_queue_size op for controllers

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Some transports, such as RDMA, would like to set the queue size
according to device/port/ctrl characteristics. Add a new nvmet transport
op that is called during ctrl initialization. This will not effect
transports that don't implement this option.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Max Gurtovoy 2021-09-23 00:55:36 +03:00 committed by Christoph Hellwig
parent 44c3c6257e
commit 6d1555cc41
2 changed files with 6 additions and 3 deletions
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8
drivers/nvme/target/core.c
View file

@ -1205,7 +1205,10 @@ static void nvmet_init_cap(struct nvmet_ctrl *ctrl)
/* CC.EN timeout in 500msec units: */
ctrl->cap |= (15ULL << 24);
/* maximum queue entries supported: */
ctrl->cap |= NVMET_QUEUE_SIZE - 1;
if (ctrl->ops->get_max_queue_size)
ctrl->cap |= ctrl->ops->get_max_queue_size(ctrl) - 1;
else
ctrl->cap |= NVMET_QUEUE_SIZE - 1;
if (nvmet_is_passthru_subsys(ctrl->subsys))
nvmet_passthrough_override_cap(ctrl);
@ -1367,6 +1370,7 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
mutex_init(&ctrl->lock);
ctrl->port = req->port;
ctrl->ops = req->ops;
INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work);
INIT_LIST_HEAD(&ctrl->async_events);
@ -1405,8 +1409,6 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
}
ctrl->cntlid = ret;
ctrl->ops = req->ops;
/*
* Discovery controllers may use some arbitrary high value
* in order to cleanup stale discovery sessions

1
drivers/nvme/target/nvmet.h
View file

@ -309,6 +309,7 @@ struct nvmet_fabrics_ops {
u16 (*install_queue)(struct nvmet_sq *nvme_sq);
void (*discovery_chg)(struct nvmet_port *port);
u8 (*get_mdts)(const struct nvmet_ctrl *ctrl);
u16 (*get_max_queue_size)(const struct nvmet_ctrl *ctrl);
};
#define NVMET_MAX_INLINE_BIOVEC 8