[PATCH v2] fabrics: ensure zero kato for non-persistent controllers

[Martin George]

Add a helper function that sets the default kato value for the
controllers. Along with ensuring a non-zero kato value (i.e.
NVMF_DEF_DISC_TMO) is passed to a persistent discovery controller,
it also ensures a zero kato is passed to a non-persistent discovery
controller.

Signed-off-by: Martin George <marting at netapp.com>
---
 fabrics.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/fabrics.c b/fabrics.c
index e38657e..c780040 100644
--- a/fabrics.c
+++ b/fabrics.c
@@ -918,6 +918,16 @@ static int build_options(char *argstr, int max_len, bool discover)
 	return 0;
 }
 
+static void set_kato(struct config *cfg)
+{
+	/* Set kato to NVMF_DEF_DISC_TMO for persistent discovery controllers */
+	if (cfg->persistent && !cfg->keep_alive_tmo)
+		cfg->keep_alive_tmo = NVMF_DEF_DISC_TMO;
+	/* Set kato to zero for non-persistent discovery controllers */
+	else if (!cfg->persistent && (cfg->keep_alive_tmo > 0))
+		cfg->keep_alive_tmo = 0;
+}
+
 static void discovery_trsvcid(struct config *cfg)
 {
 	if (!strcmp(cfg->transport, "tcp")) {
@@ -1401,8 +1411,7 @@ static int discover_from_conf_file(const char *desc, char *argstr,
 		if (err)
 			goto free_and_continue;
 
-		if (cfg.persistent && !cfg.keep_alive_tmo)
-			cfg.keep_alive_tmo = NVMF_DEF_DISC_TMO;
+		set_kato(&cfg);
 
 		if (traddr_is_hostname(&cfg)) {
 			ret = hostname2traddr(&cfg);
@@ -1476,8 +1485,7 @@ int fabrics_discover(const char *desc, int argc, char **argv, bool connect)
 	if (!cfg.transport && !cfg.traddr) {
 		ret = discover_from_conf_file(desc, argstr, opts, connect);
 	} else {
-		if (cfg.persistent && !cfg.keep_alive_tmo)
-			cfg.keep_alive_tmo = NVMF_DEF_DISC_TMO;
+		set_kato(&cfg);
 
 		if (traddr_is_hostname(&cfg)) {
 			ret = hostname2traddr(&cfg);
-- 
2.30.0