[SCSI] scsi_transport_iscsi: Add host statistics support
Add transport_iscsi hooks to get aggregate host statistics.
The statistics include MAC, TCP/IP & iSCSI statistics.
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 9477f84..4cf918a 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -3416,6 +3416,73 @@
}
static int
+iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
+{
+ struct iscsi_uevent *ev = nlmsg_data(nlh);
+ struct Scsi_Host *shost = NULL;
+ struct iscsi_internal *priv;
+ struct sk_buff *skbhost_stats;
+ struct nlmsghdr *nlhhost_stats;
+ struct iscsi_uevent *evhost_stats;
+ int host_stats_size = 0;
+ int len, err = 0;
+ char *buf;
+
+ if (!transport->get_host_stats)
+ return -EINVAL;
+
+ priv = iscsi_if_transport_lookup(transport);
+ if (!priv)
+ return -EINVAL;
+
+ host_stats_size = sizeof(struct iscsi_offload_host_stats);
+ len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
+
+ shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
+ if (!shost) {
+ pr_err("%s: failed. Cound not find host no %u\n",
+ __func__, ev->u.get_host_stats.host_no);
+ return -ENODEV;
+ }
+
+ do {
+ int actual_size;
+
+ skbhost_stats = alloc_skb(len, GFP_KERNEL);
+ if (!skbhost_stats) {
+ pr_err("cannot deliver host stats: OOM\n");
+ err = -ENOMEM;
+ goto exit_host_stats;
+ }
+
+ nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
+ (len - sizeof(*nlhhost_stats)), 0);
+ evhost_stats = nlmsg_data(nlhhost_stats);
+ memset(evhost_stats, 0, sizeof(*evhost_stats));
+ evhost_stats->transport_handle = iscsi_handle(transport);
+ evhost_stats->type = nlh->nlmsg_type;
+ evhost_stats->u.get_host_stats.host_no =
+ ev->u.get_host_stats.host_no;
+ buf = (char *)((char *)evhost_stats + sizeof(*evhost_stats));
+ memset(buf, 0, host_stats_size);
+
+ err = transport->get_host_stats(shost, buf, host_stats_size);
+
+ actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
+ skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
+ nlhhost_stats->nlmsg_len = actual_size;
+
+ err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
+ GFP_KERNEL);
+ } while (err < 0 && err != -ECONNREFUSED);
+
+exit_host_stats:
+ scsi_host_put(shost);
+ return err;
+}
+
+
+static int
iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
{
int err = 0;
@@ -3594,6 +3661,9 @@
err = iscsi_set_chap(transport, ev,
nlmsg_attrlen(nlh, sizeof(*ev)));
break;
+ case ISCSI_UEVENT_GET_HOST_STATS:
+ err = iscsi_get_host_stats(transport, nlh);
+ break;
default:
err = -ENOSYS;
break;