nvmet: add 'host_traddr' callback for debugfs
We want to display the transport address of the connected host in debugfs, but this is a property of the transport. So add a callback 'host_traddr' to allow the transport drivers to fill in the data. Signed-off-by: Hannes Reinecke <hare@kernel.org> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Signed-off-by: Daniel Wagner <dwagner@suse.de> Signed-off-by: Keith Busch <kbusch@kernel.org>
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@ -1542,6 +1542,14 @@ void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
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}
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EXPORT_SYMBOL_GPL(nvmet_ctrl_fatal_error);
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ssize_t nvmet_ctrl_host_traddr(struct nvmet_ctrl *ctrl,
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char *traddr, size_t traddr_len)
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{
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if (!ctrl->ops->host_traddr)
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return -EOPNOTSUPP;
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return ctrl->ops->host_traddr(ctrl, traddr, traddr_len);
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}
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static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
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const char *subsysnqn)
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{
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@ -115,6 +115,23 @@ static ssize_t nvmet_ctrl_state_write(struct file *file, const char __user *buf,
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}
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NVMET_DEBUGFS_RW_ATTR(nvmet_ctrl_state);
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static int nvmet_ctrl_host_traddr_show(struct seq_file *m, void *p)
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{
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struct nvmet_ctrl *ctrl = m->private;
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ssize_t size;
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char buf[NVMF_TRADDR_SIZE + 1];
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size = nvmet_ctrl_host_traddr(ctrl, buf, NVMF_TRADDR_SIZE);
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if (size < 0) {
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buf[0] = '\0';
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size = 0;
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}
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buf[size] = '\0';
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seq_printf(m, "%s\n", buf);
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return 0;
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}
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NVMET_DEBUGFS_ATTR(nvmet_ctrl_host_traddr);
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int nvmet_debugfs_ctrl_setup(struct nvmet_ctrl *ctrl)
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{
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char name[32];
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@ -138,6 +155,8 @@ int nvmet_debugfs_ctrl_setup(struct nvmet_ctrl *ctrl)
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&nvmet_ctrl_kato_fops);
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debugfs_create_file("state", S_IRUSR | S_IWUSR, ctrl->debugfs_dir, ctrl,
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&nvmet_ctrl_state_fops);
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debugfs_create_file("host_traddr", S_IRUSR, ctrl->debugfs_dir, ctrl,
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&nvmet_ctrl_host_traddr_fops);
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return 0;
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}
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@ -354,6 +354,8 @@ struct nvmet_fabrics_ops {
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void (*delete_ctrl)(struct nvmet_ctrl *ctrl);
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void (*disc_traddr)(struct nvmet_req *req,
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struct nvmet_port *port, char *traddr);
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ssize_t (*host_traddr)(struct nvmet_ctrl *ctrl,
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char *traddr, size_t traddr_len);
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u16 (*install_queue)(struct nvmet_sq *nvme_sq);
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void (*discovery_chg)(struct nvmet_port *port);
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u8 (*get_mdts)(const struct nvmet_ctrl *ctrl);
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@ -502,6 +504,8 @@ struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn,
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struct nvmet_req *req);
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void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
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u16 nvmet_check_ctrl_status(struct nvmet_req *req);
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ssize_t nvmet_ctrl_host_traddr(struct nvmet_ctrl *ctrl,
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char *traddr, size_t traddr_len);
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struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
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enum nvme_subsys_type type);
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