[PATCHv2] nvme: print out valid arguments when reading from /dev/nvme-fabrics

[Hannes Reinecke <hare@suse.de>]

Currently applications have a hard time figuring out which
nvme-over-fabrics arguments are supported for any given kernel;
the ioctl will return an error code on failure, and the application
has to guess whether this was due to an invalid argument or due
to a connection or controller error.
With this patch applications can read a list of supported
arguments by simply reading from /dev/nvme-fabrics, allowing
them to validate the connection string.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/nvme/host/fabrics.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 282d54117e0a..7ae041e2b3fb 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -1069,6 +1069,26 @@ static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf,
 	return ret ? ret : count;
 }
 
+static void __nvmf_concat_opt_tokens(struct seq_file *seq_file)
+{
+	const struct match_token *tok;
+	int idx;
+
+	/*
+	 * Add dummy entries for instance and cntlid to
+	 * signal an invalid/non-existing controller
+	 */
+	seq_puts(seq_file, "instance=-1,cntlid=-1");
+	for (idx = 0; idx < ARRAY_SIZE(opt_tokens); idx++) {
+		tok = &opt_tokens[idx];
+		if (tok->token == NVMF_OPT_ERR)
+			continue;
+		seq_puts(seq_file, ",");
+		seq_puts(seq_file, tok->pattern);
+	}
+	seq_puts(seq_file, "\n");
+}
+
 static int nvmf_dev_show(struct seq_file *seq_file, void *private)
 {
 	struct nvme_ctrl *ctrl;
@@ -1077,7 +1097,7 @@ static int nvmf_dev_show(struct seq_file *seq_file, void *private)
 	mutex_lock(&nvmf_dev_mutex);
 	ctrl = seq_file->private;
 	if (!ctrl) {
-		ret = -EINVAL;
+		__nvmf_concat_opt_tokens(seq_file);
 		goto out_unlock;
 	}
 
-- 
2.29.2