staging: lustre: lnet: enable configuration per NI interface

Add the ability to configure each NI interface at bring up.
Also give the ability for user land utilities to query the
configuration of each NI interface.

Signed-off-by: Amir Shehata <[email protected]>
Signed-off-by: James Simmons <[email protected]>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7101
Reviewed-on: http://review.whamcloud.com/16367
Reviewed-by: Doug Oucharek <[email protected]>
Reviewed-by: Olaf Weber <[email protected]>
Reviewed-by: Oleg Drokin <[email protected]>
Signed-off-by: James Simmons <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lnet/lnet/api-ni.c b/drivers/staging/lustre/lnet/lnet/api-ni.c
index 01e1808be36c..fe0dbe7468e7 100644
--- a/drivers/staging/lustre/lnet/lnet/api-ni.c
+++ b/drivers/staging/lustre/lnet/lnet/api-ni.c
@@ -1217,6 +1217,7 @@ lnet_shutdown_lndni(struct lnet_ni *ni)
 static int
 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_ioctl_config_data *conf)
 {
+	struct lnet_ioctl_config_lnd_tunables *lnd_tunables = NULL;
 	int rc = -EINVAL;
 	int lnd_type;
 	lnd_t *lnd;
@@ -1274,6 +1275,21 @@ lnet_startup_lndni(struct lnet_ni *ni, struct lnet_ioctl_config_data *conf)
 
 	ni->ni_lnd = lnd;
 
+	if (conf && conf->cfg_hdr.ioc_len > sizeof(*conf))
+		lnd_tunables = (struct lnet_ioctl_config_lnd_tunables *)conf->cfg_bulk;
+
+	if (lnd_tunables) {
+		LIBCFS_ALLOC(ni->ni_lnd_tunables,
+			     sizeof(*ni->ni_lnd_tunables));
+		if (!ni->ni_lnd_tunables) {
+			mutex_unlock(&the_lnet.ln_lnd_mutex);
+			rc = -ENOMEM;
+			goto failed0;
+		}
+		memcpy(ni->ni_lnd_tunables, lnd_tunables,
+		       sizeof(*ni->ni_lnd_tunables));
+	}
+
 	rc = lnd->lnd_startup(ni);
 
 	mutex_unlock(&the_lnet.ln_lnd_mutex);
@@ -1653,7 +1669,9 @@ EXPORT_SYMBOL(LNetNIFini);
 static void
 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_data *config)
 {
+	struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
 	struct lnet_ioctl_net_config *net_config;
+	size_t min_size, tunable_size = 0;
 	int i;
 
 	if (!ni || !config)
@@ -1691,6 +1709,30 @@ lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_data *config)
 
 		config->cfg_ncpts = num_cpts;
 	}
+
+	/*
+	 * See if user land tools sent in a newer and larger version
+	 * of struct lnet_tunables than what the kernel uses.
+	 */
+	min_size = sizeof(*config) + sizeof(*net_config);
+
+	if (config->cfg_hdr.ioc_len > min_size)
+		tunable_size = config->cfg_hdr.ioc_len - min_size;
+
+	/* Don't copy to much data to user space */
+	min_size = min(tunable_size, sizeof(*ni->ni_lnd_tunables));
+	lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
+
+	if (ni->ni_lnd_tunables && lnd_cfg && min_size) {
+		memcpy(lnd_cfg, ni->ni_lnd_tunables, min_size);
+		config->cfg_config_u.cfg_net.net_interface_count = 1;
+
+		/* Tell user land that kernel side has less data */
+		if (tunable_size > sizeof(*ni->ni_lnd_tunables)) {
+			min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
+			config->cfg_hdr.ioc_len -= min_size;
+		}
+	}
 }
 
 static int