Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h
new file mode 100644
index 0000000000..82e7a27ffb
--- /dev/null
+++ b/drivers/nvme/host/fabrics.h
@@ -0,0 +1,230 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NVMe over Fabrics common host code.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ */
+#ifndef _NVME_FABRICS_H
+#define _NVME_FABRICS_H 1
+
+#include <linux/in.h>
+#include <linux/inet.h>
+
+#define NVMF_MIN_QUEUE_SIZE	16
+#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
+/* default is -1: the fail fast mechanism is disabled  */
+#define NVMF_DEF_FAIL_FAST_TMO		-1
+
+/*
+ * Reserved one command for internal usage.  This command is used for sending
+ * the connect command, as well as for the keep alive command on the admin
+ * queue once live.
+ */
+#define NVMF_RESERVED_TAGS	1
+
+/*
+ * Define a host as seen by the target.  We allocate one at boot, but also
+ * allow the override it when creating controllers.  This is both to provide
+ * persistence of the Host NQN over multiple boots, and to allow using
+ * multiple ones, for example in a container scenario.  Because we must not
+ * use different Host NQNs with the same Host ID we generate a Host ID and
+ * use this structure to keep track of the relation between the two.
+ */
+struct nvmf_host {
+	struct kref		ref;
+	struct list_head	list;
+	char			nqn[NVMF_NQN_SIZE];
+	uuid_t			id;
+};
+
+/**
+ * enum nvmf_parsing_opts - used to define the sysfs parsing options used.
+ */
+enum {
+	NVMF_OPT_ERR		= 0,
+	NVMF_OPT_TRANSPORT	= 1 << 0,
+	NVMF_OPT_NQN		= 1 << 1,
+	NVMF_OPT_TRADDR		= 1 << 2,
+	NVMF_OPT_TRSVCID	= 1 << 3,
+	NVMF_OPT_QUEUE_SIZE	= 1 << 4,
+	NVMF_OPT_NR_IO_QUEUES	= 1 << 5,
+	NVMF_OPT_TL_RETRY_COUNT	= 1 << 6,
+	NVMF_OPT_KATO		= 1 << 7,
+	NVMF_OPT_HOSTNQN	= 1 << 8,
+	NVMF_OPT_RECONNECT_DELAY = 1 << 9,
+	NVMF_OPT_HOST_TRADDR	= 1 << 10,
+	NVMF_OPT_CTRL_LOSS_TMO	= 1 << 11,
+	NVMF_OPT_HOST_ID	= 1 << 12,
+	NVMF_OPT_DUP_CONNECT	= 1 << 13,
+	NVMF_OPT_DISABLE_SQFLOW = 1 << 14,
+	NVMF_OPT_HDR_DIGEST	= 1 << 15,
+	NVMF_OPT_DATA_DIGEST	= 1 << 16,
+	NVMF_OPT_NR_WRITE_QUEUES = 1 << 17,
+	NVMF_OPT_NR_POLL_QUEUES = 1 << 18,
+	NVMF_OPT_TOS		= 1 << 19,
+	NVMF_OPT_FAIL_FAST_TMO	= 1 << 20,
+	NVMF_OPT_HOST_IFACE	= 1 << 21,
+	NVMF_OPT_DISCOVERY	= 1 << 22,
+	NVMF_OPT_DHCHAP_SECRET	= 1 << 23,
+	NVMF_OPT_DHCHAP_CTRL_SECRET = 1 << 24,
+};
+
+/**
+ * struct nvmf_ctrl_options - Used to hold the options specified
+ *			      with the parsing opts enum.
+ * @mask:	Used by the fabrics library to parse through sysfs options
+ *		on adding a NVMe controller.
+ * @max_reconnects: maximum number of allowed reconnect attempts before removing
+ *		the controller, (-1) means reconnect forever, zero means remove
+ *		immediately;
+ * @transport:	Holds the fabric transport "technology name" (for a lack of
+ *		better description) that will be used by an NVMe controller
+ *		being added.
+ * @subsysnqn:	Hold the fully qualified NQN subystem name (format defined
+ *		in the NVMe specification, "NVMe Qualified Names").
+ * @traddr:	The transport-specific TRADDR field for a port on the
+ *              subsystem which is adding a controller.
+ * @trsvcid:	The transport-specific TRSVCID field for a port on the
+ *              subsystem which is adding a controller.
+ * @host_traddr: A transport-specific field identifying the NVME host port
+ *     to use for the connection to the controller.
+ * @host_iface: A transport-specific field identifying the NVME host
+ *     interface to use for the connection to the controller.
+ * @queue_size: Number of IO queue elements.
+ * @nr_io_queues: Number of controller IO queues that will be established.
+ * @reconnect_delay: Time between two consecutive reconnect attempts.
+ * @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.
+ * @dhchap_secret: DH-HMAC-CHAP secret
+ * @dhchap_ctrl_secret: DH-HMAC-CHAP controller secret for bi-directional
+ *              authentication
+ * @disable_sqflow: disable controller sq flow control
+ * @hdr_digest: generate/verify header digest (TCP)
+ * @data_digest: generate/verify data digest (TCP)
+ * @nr_write_queues: number of queues for write I/O
+ * @nr_poll_queues: number of queues for polling I/O
+ * @tos: type of service
+ * @fast_io_fail_tmo: Fast I/O fail timeout in seconds
+ */
+struct nvmf_ctrl_options {
+	unsigned		mask;
+	int			max_reconnects;
+	char			*transport;
+	char			*subsysnqn;
+	char			*traddr;
+	char			*trsvcid;
+	char			*host_traddr;
+	char			*host_iface;
+	size_t			queue_size;
+	unsigned int		nr_io_queues;
+	unsigned int		reconnect_delay;
+	bool			discovery_nqn;
+	bool			duplicate_connect;
+	unsigned int		kato;
+	struct nvmf_host	*host;
+	char			*dhchap_secret;
+	char			*dhchap_ctrl_secret;
+	bool			disable_sqflow;
+	bool			hdr_digest;
+	bool			data_digest;
+	unsigned int		nr_write_queues;
+	unsigned int		nr_poll_queues;
+	int			tos;
+	int			fast_io_fail_tmo;
+};
+
+/*
+ * struct nvmf_transport_ops - used to register a specific
+ *			       fabric implementation of NVMe fabrics.
+ * @entry:		Used by the fabrics library to add the new
+ *			registration entry to its linked-list internal tree.
+ * @module:             Transport module reference
+ * @name:		Name of the NVMe fabric driver implementation.
+ * @required_opts:	sysfs command-line options that must be specified
+ *			when adding a new NVMe controller.
+ * @allowed_opts:	sysfs command-line options that can be specified
+ *			when adding a new NVMe controller.
+ * @create_ctrl():	function pointer that points to a non-NVMe
+ *			implementation-specific fabric technology
+ *			that would go into starting up that fabric
+ *			for the purpose of conneciton to an NVMe controller
+ *			using that fabric technology.
+ *
+ * Notes:
+ *	1. At minimum, 'required_opts' and 'allowed_opts' should
+ *	   be set to the same enum parsing options defined earlier.
+ *	2. create_ctrl() must be defined (even if it does nothing)
+ *	3. struct nvmf_transport_ops must be statically allocated in the
+ *	   modules .bss section so that a pure module_get on @module
+ *	   prevents the memory from beeing freed.
+ */
+struct nvmf_transport_ops {
+	struct list_head	entry;
+	struct module		*module;
+	const char		*name;
+	int			required_opts;
+	int			allowed_opts;
+	struct nvme_ctrl	*(*create_ctrl)(struct device *dev,
+					struct nvmf_ctrl_options *opts);
+};
+
+static inline bool
+nvmf_ctlr_matches_baseopts(struct nvme_ctrl *ctrl,
+			struct nvmf_ctrl_options *opts)
+{
+	if (ctrl->state == NVME_CTRL_DELETING ||
+	    ctrl->state == NVME_CTRL_DELETING_NOIO ||
+	    ctrl->state == NVME_CTRL_DEAD ||
+	    strcmp(opts->subsysnqn, ctrl->opts->subsysnqn) ||
+	    strcmp(opts->host->nqn, ctrl->opts->host->nqn) ||
+	    !uuid_equal(&opts->host->id, &ctrl->opts->host->id))
+		return false;
+
+	return true;
+}
+
+static inline char *nvmf_ctrl_subsysnqn(struct nvme_ctrl *ctrl)
+{
+	if (!ctrl->subsys ||
+	    !strcmp(ctrl->opts->subsysnqn, NVME_DISC_SUBSYS_NAME))
+		return ctrl->opts->subsysnqn;
+	return ctrl->subsys->subnqn;
+}
+
+static inline void nvmf_complete_timed_out_request(struct request *rq)
+{
+	if (blk_mq_request_started(rq) && !blk_mq_request_completed(rq)) {
+		nvme_req(rq)->status = NVME_SC_HOST_ABORTED_CMD;
+		blk_mq_complete_request(rq);
+	}
+}
+
+static inline unsigned int nvmf_nr_io_queues(struct nvmf_ctrl_options *opts)
+{
+	return min(opts->nr_io_queues, num_online_cpus()) +
+		min(opts->nr_write_queues, num_online_cpus()) +
+		min(opts->nr_poll_queues, num_online_cpus());
+}
+
+int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val);
+int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val);
+int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val);
+int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl);
+int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid);
+int nvmf_register_transport(struct nvmf_transport_ops *ops);
+void nvmf_unregister_transport(struct nvmf_transport_ops *ops);
+void nvmf_free_options(struct nvmf_ctrl_options *opts);
+int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size);
+bool nvmf_should_reconnect(struct nvme_ctrl *ctrl);
+bool nvmf_ip_options_match(struct nvme_ctrl *ctrl,
+		struct nvmf_ctrl_options *opts);
+void nvmf_set_io_queues(struct nvmf_ctrl_options *opts, u32 nr_io_queues,
+			u32 io_queues[HCTX_MAX_TYPES]);
+void nvmf_map_queues(struct blk_mq_tag_set *set, struct nvme_ctrl *ctrl,
+		     u32 io_queues[HCTX_MAX_TYPES]);
+
+#endif /* _NVME_FABRICS_H */