[rhel6-branch] Support for IPoIB.

[Ales Kozumplik <akozumpl redhat com>]

For now the support includes:
- support for 20-byte MAC addresses
- allowing detection of IB devices in devices.c
- using libnl to detect the link layer type of a device

This all ensures we write out correct information into the ifcfg files
(which are then used by NM).

This is an initial attempt, I am unable to fully test this now due to
problems with missing IB support in NetworkManager.

Related: rhbz#660686
---
 isys/devices.c  |    4 +++-
 isys/iface.c    |   34 +++++++++++++++++++++++++++++++++-
 isys/iface.h    |    5 +++++
 loader/loader.c |    3 +++
 loader/net.c    |   29 +++++++++++++++++++++++++++++
 5 files changed, 73 insertions(+), 2 deletions(-)

diff --git a/isys/devices.c b/isys/devices.c
index 2a77ce4..819b2fb 100644
--- a/isys/devices.c
+++ b/isys/devices.c
@@ -172,7 +172,9 @@ storagedone:
                 return NULL;
             }
 
-            if (type != ARPHRD_ETHER && type != ARPHRD_SLIP)
+            if (type != ARPHRD_ETHER &&
+                type != ARPHRD_INFINIBAND &&
+                type != ARPHRD_SLIP)
                 continue;
 
             new = calloc(1, sizeof(struct device));
diff --git a/isys/iface.c b/isys/iface.c
index 05446ee..db3027f 100644
--- a/isys/iface.c
+++ b/isys/iface.c
@@ -275,7 +275,7 @@ char *iface_mac2device(char *mac) {
  * readable format (e.g., 00:11:52:12:D9:A0).  Return NULL for no match.
  */
 char *iface_mac2str(char *ifname) {
-    int buflen = 20;
+    int buflen = 64;
     char *buf = NULL;
     struct nl_handle *handle = NULL;
     struct nl_cache *cache = NULL;
@@ -569,3 +569,35 @@ ifacemtu_error1:
 
     return ret;
 }
+
+/*
+ * Get the link layer type of the device.
+ */
+int iface_get_arptype(const char *ifname)
+{
+    int ret;
+    struct nl_cache *cache = NULL;
+    struct nl_handle *handle = NULL;
+    struct rtnl_link *link = NULL;
+
+    if (ifname == NULL) {
+        return -1;
+    }
+
+    if ((cache = _iface_get_link_cache(&handle)) == NULL) {
+        return -3;
+    }
+
+    if ((link = rtnl_link_get_by_name(cache, ifname)) == NULL) {
+        ret = -4;
+        goto iface_get_arptype_error;
+    }
+
+    ret = rtnl_link_get_arptype(link);
+
+iface_get_arptype_error:
+    nl_close(handle);
+    nl_handle_destroy(handle);
+
+    return ret;
+}
diff --git a/isys/iface.h b/isys/iface.h
index f7d073e..567f5ee 100644
--- a/isys/iface.h
+++ b/isys/iface.h
@@ -164,4 +164,9 @@ int iface_start_NetworkManager(void);
  */
 int iface_set_interface_mtu(char *ifname, int mtu);
 
+/*
+ * Get the link layer type of the device.
+ */
+int iface_get_arptype(const char *ifname);
+
 #endif /* ISYSIFACE_H */
diff --git a/loader/loader.c b/loader/loader.c
index 0154ce0..81e1d68 100644
--- a/loader/loader.c
+++ b/loader/loader.c
@@ -2073,6 +2073,9 @@ int main(int argc, char ** argv) {
 
     mlLoadModuleSet("cramfs:squashfs:iscsi_tcp");
 
+    /* Load all modules needed for IP over Infiniband */
+    mlLoadModuleSet("ib_ipoib:mlx4_core:mlx4_en");
+
     loadScsiDhModules();
 
 #if !defined(__s390__) && !defined(__s390x__)
diff --git a/loader/net.c b/loader/net.c
index 1531d4f..725c160 100644
--- a/loader/net.c
+++ b/loader/net.c
@@ -30,6 +30,7 @@
 #include <errno.h>
 #include <resolv.h>
 #include <net/if.h>
+#include <net/if_arp.h>
 #include <newt.h>
 #include <stdlib.h>
 #include <string.h>
@@ -154,6 +155,31 @@ static void ipCallback(newtComponent co, void * dptr) {
     }
 }
 
+/*
+ * Return a newly allocated string with the network device type.
+ *
+ * This can directly be written into the ifcfg script's TYPE= field.
+ */
+static char *netArpTypeStr(iface_t *iface)
+{
+    char *ret = NULL;
+    int arptype = iface_get_arptype(iface->device);
+    switch (arptype) {
+    case ARPHRD_ETHER:
+        ret = strdup("Ethernet");
+        break;
+    case ARPHRD_INFINIBAND:
+        ret = strdup("Infiniband");
+        break;
+    case ARPHRD_SLIP:
+        break;
+    default:
+        logMessage(ERROR, "Unknown network device type: %d", arptype);
+        break;
+    }
+    return ret;
+}
+
 static void setMethodSensitivity(void *dptr, int radio_button_count) {
     int i = 0;
 
@@ -1295,6 +1321,9 @@ int writeEnabledNetInfo(iface_t *iface) {
     fprintf(fp, "HWADDR=%s\n", iface_mac2str(iface->device));
 #endif
     fprintf(fp, "ONBOOT=yes\n");
+    char *str_type = netArpTypeStr(iface);
+    if (str_type) fprintf(fp, "TYPE=%s\n", str_type);
+    free(str_type);
 
     if (!FL_NOIPV4(flags)) {
         if (iface->ipv4method == IPV4_IBFT_METHOD) {
-- 
1.7.3.3