nvme-fabrics: add a generic NVMe over Fabrics library
The NVMe over Fabrics library provides an interface for both transports
and the nvme core to handle fabrics specific commands and attributes
independent of the underlying transport.
In addition, the fabrics library adds a misc device interface that allow
actually creating a fabrics controller, as we can't just autodiscover
it like in the PCI case. The nvme-cli utility has been enhanced to use
this interface to support fabric connect and discovery.
Signed-off-by: Armen Baloyan <armenx.baloyan@intel.com>,
Signed-off-by: Jay Freyensee <james.p.freyensee@intel.com>,
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index c99acb0..ef28d4e 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -80,6 +80,7 @@
spinlock_t lock;
const struct nvme_ctrl_ops *ops;
struct request_queue *admin_q;
+ struct request_queue *connect_q;
struct device *dev;
struct kref kref;
int instance;
@@ -107,10 +108,19 @@
u8 event_limit;
u8 vwc;
u32 vs;
+ u32 sgls;
bool subsystem;
unsigned long quirks;
struct work_struct scan_work;
struct work_struct async_event_work;
+
+ /* Fabrics only */
+ u16 sqsize;
+ u32 ioccsz;
+ u32 iorcsz;
+ u16 icdoff;
+ u16 maxcmd;
+ struct nvmf_ctrl_options *opts;
};
/*
@@ -146,6 +156,7 @@
struct nvme_ctrl_ops {
const char *name;
struct module *module;
+ bool is_fabrics;
int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);