[SCSI] iscsi_transport: Added Ping support
Added ping support for iscsi adapter, application can use this
interface for diagnostic network connection.
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 38f0bf8..a20f181 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1507,6 +1507,35 @@
}
EXPORT_SYMBOL_GPL(iscsi_post_host_event);
+void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
+ uint32_t status, uint32_t pid, uint32_t data_size,
+ uint8_t *data)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ int len = NLMSG_SPACE(sizeof(*ev) + data_size);
+
+ skb = alloc_skb(len, GFP_KERNEL);
+ if (!skb) {
+ printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
+ return;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ ev->transport_handle = iscsi_handle(transport);
+ ev->type = ISCSI_KEVENT_PING_COMP;
+ ev->r.ping_comp.host_no = host_no;
+ ev->r.ping_comp.status = status;
+ ev->r.ping_comp.pid = pid;
+ ev->r.ping_comp.data_size = data_size;
+ memcpy((char *)ev + sizeof(*ev), data, data_size);
+
+ iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
+
static int
iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
void *payload, int size)
@@ -1946,6 +1975,33 @@
}
static int
+iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
+{
+ struct Scsi_Host *shost;
+ struct sockaddr *dst_addr;
+ int err;
+
+ if (!transport->send_ping)
+ return -ENOSYS;
+
+ shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
+ if (!shost) {
+ printk(KERN_ERR "iscsi_ping could not find host no %u\n",
+ ev->u.iscsi_ping.host_no);
+ return -ENODEV;
+ }
+
+ dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
+ err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
+ ev->u.iscsi_ping.iface_type,
+ ev->u.iscsi_ping.payload_size,
+ ev->u.iscsi_ping.pid,
+ dst_addr);
+ 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;
@@ -2090,6 +2146,9 @@
err = iscsi_set_iface_params(transport, ev,
nlmsg_attrlen(nlh, sizeof(*ev)));
break;
+ case ISCSI_UEVENT_PING:
+ err = iscsi_send_ping(transport, ev);
+ break;
default:
err = -ENOSYS;
break;