[SCSI] cxgb3i: Fix a login over vlan issue

Fix a target login issue, when parent interface is vlan and we are
using cxgb3i sepecific private ip address in '/etc/iscsi/ifaces/'
iface file.

Signed-off-by: Rakesh Ranjan <rakesh@chelsio.com>
Acked-by: Karen Xie <kxie@chelsio.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 33 insertions, 1 deletions

diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.c b/drivers/scsi/cxgb3i/cxgb3i_offload.c
index 26ffdcd5a437..15a00e8b7122 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_offload.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.c
@@ -1440,6 +1440,10 @@ void cxgb3i_c3cn_release(struct s3_conn *c3cn)
 static int is_cxgb3_dev(struct net_device *dev)
 {
         struct cxgb3i_sdev_data *cdata;
+        struct net_device *ndev = dev;
+
+        if (dev->priv_flags & IFF_802_1Q_VLAN)
+                ndev = vlan_dev_real_dev(dev);
 
         write_lock(&cdata_rwlock);
         list_for_each_entry(cdata, &cdata_list, list) {
@@ -1447,7 +1451,7 @@ static int is_cxgb3_dev(struct net_device *dev)
                 int i;
 
                 for (i = 0; i < ports->nports; i++)
-                        if (dev == ports->lldevs[i]) {
+                        if (ndev == ports->lldevs[i]) {
                                 write_unlock(&cdata_rwlock);
                                 return 1;
                         }
@@ -1566,6 +1570,26 @@ out_err:
         return -EINVAL;
 }
 
+/**
+ * cxgb3i_find_dev - find the interface associated with the given address
+ * @ipaddr: ip address
+ */
+static struct net_device *
+cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr)
+{
+        struct flowi fl;
+        int err;
+        struct rtable *rt;
+
+        memset(&fl, 0, sizeof(fl));
+        fl.nl_u.ip4_u.daddr = ipaddr;
+
+        err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl);
+        if (!err)
+                return (&rt->u.dst)->dev;
+
+        return NULL;
+}
 
 /**
  * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address
@@ -1581,6 +1605,7 @@ int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn,
         struct cxgb3i_sdev_data *cdata;
         struct t3cdev *cdev;
         __be32 sipv4;
+        struct net_device *dstdev;
         int err;
 
         c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev);
@@ -1591,6 +1616,13 @@ int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn,
         c3cn->daddr.sin_port = usin->sin_port;
         c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
 
+        dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr);
+        if (!dstdev || !is_cxgb3_dev(dstdev))
+                return -ENETUNREACH;
+
+        if (dstdev->priv_flags & IFF_802_1Q_VLAN)
+                dev = dstdev;
+
         rt = find_route(dev, c3cn->saddr.sin_addr.s_addr,
                         c3cn->daddr.sin_addr.s_addr,
                         c3cn->saddr.sin_port,