[PATCH] nodedev: Fabric name must not be required for fc_host capability

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fabric_name is one of many fc_host attributes in Linux that is optional
and left to the low-level driver to decide if it is implemented.
The zfcp device driver does not provide a fabric name for an fcp host.

This patch removes the requirement for a fabric name by making it optional.

Signed-off-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Bjoern Walk <bwalk@xxxxxxxxxxxxxxxxxx>
---
 docs/formatnode.html.in                   |  2 +-
 docs/schemas/nodedev.rng                  |  8 +++---
 src/node_device/node_device_linux_sysfs.c |  3 +--
 src/util/virutil.c                        |  4 +--
 tests/fchostdata/fc_host/host7/node_name  |  1 +
 tests/fchostdata/fc_host/host7/port_name  |  1 +
 tests/fchostdata/fc_host/host7/port_state |  1 +
 tests/fchosttest.c                        | 44 ++++++++++++++++++++++++++++---
 8 files changed, 53 insertions(+), 11 deletions(-)
 create mode 100644 tests/fchostdata/fc_host/host7/node_name
 create mode 100644 tests/fchostdata/fc_host/host7/port_name
 create mode 100644 tests/fchostdata/fc_host/host7/port_state

diff --git a/docs/formatnode.html.in b/docs/formatnode.html.in
index e7b1140..f8d0e12 100644
--- a/docs/formatnode.html.in
+++ b/docs/formatnode.html.in
@@ -254,7 +254,7 @@
                 number of vport in use. <code>max_vports</code> shows the
                 maximum vports the HBA supports. "fc_host" implies following
                 sub-elements: <code>wwnn</code>, <code>wwpn</code>, and
-                <code>fabric_wwn</code>.
+                optionally <code>fabric_wwn</code>.
               </dd>
             </dl>
           </dd>
diff --git a/docs/schemas/nodedev.rng b/docs/schemas/nodedev.rng
index 9c98402..b100a6e 100644
--- a/docs/schemas/nodedev.rng
+++ b/docs/schemas/nodedev.rng
@@ -367,9 +367,11 @@
       <ref name='wwn'/>
     </element>
 
-    <element name='fabric_wwn'>
-      <ref name='wwn'/>
-    </element>
+    <optional>
+      <element name='fabric_wwn'>
+        <ref name='wwn'/>
+      </element>
+    </optional>
   </define>
 
   <define name='capsvports'>
diff --git a/src/node_device/node_device_linux_sysfs.c b/src/node_device/node_device_linux_sysfs.c
index be99c41..e043744 100644
--- a/src/node_device/node_device_linux_sysfs.c
+++ b/src/node_device/node_device_linux_sysfs.c
@@ -73,9 +73,8 @@ nodeDeviceSysfsGetSCSIHostCaps(virNodeDevCapDataPtr d)
         VIR_STEAL_PTR(d->scsi_host.wwnn, tmp);
 
         if (!(tmp = virReadFCHost(NULL, d->scsi_host.host, "fabric_name"))) {
-            VIR_WARN("Failed to read fabric WWN for host%d",
+            VIR_INFO("Optional fabric WWN for host%d not available",
                      d->scsi_host.host);
-            goto cleanup;
         }
         VIR_FREE(d->scsi_host.fabric_wwn);
         VIR_STEAL_PTR(d->scsi_host.fabric_wwn, tmp);
diff --git a/src/util/virutil.c b/src/util/virutil.c
index aeaa7f9..ab61302 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -2011,7 +2011,7 @@ virGetSCSIHostNameByParentaddr(unsigned int domain,
  *
  * Read the value of sysfs "fc_host" entry.
  *
- * Returns result as a stringon success, caller must free @result after
+ * Returns result as a string on success, caller must free @result after
  * Otherwise returns NULL.
  */
 char *
@@ -2029,7 +2029,7 @@ virReadFCHost(const char *sysfs_prefix,
                     host, entry) < 0)
         goto cleanup;
 
-    if (virFileReadAll(sysfs_path, 1024, &buf) < 0)
+    if (virFileReadAllQuiet(sysfs_path, 1024, &buf) < 0)
         goto cleanup;
 
     if ((p = strchr(buf, '\n')))
diff --git a/tests/fchostdata/fc_host/host7/node_name b/tests/fchostdata/fc_host/host7/node_name
new file mode 100644
index 0000000..73a91bd
--- /dev/null
+++ b/tests/fchostdata/fc_host/host7/node_name
@@ -0,0 +1 @@
+0x2002001b32a9da4e
diff --git a/tests/fchostdata/fc_host/host7/port_name b/tests/fchostdata/fc_host/host7/port_name
new file mode 100644
index 0000000..f25abeb
--- /dev/null
+++ b/tests/fchostdata/fc_host/host7/port_name
@@ -0,0 +1 @@
+0x2102001b32a9da4e
diff --git a/tests/fchostdata/fc_host/host7/port_state b/tests/fchostdata/fc_host/host7/port_state
new file mode 100644
index 0000000..b73dd46
--- /dev/null
+++ b/tests/fchostdata/fc_host/host7/port_state
@@ -0,0 +1 @@
+Online
diff --git a/tests/fchosttest.c b/tests/fchosttest.c
index a08a2e8..ba580aa 100644
--- a/tests/fchosttest.c
+++ b/tests/fchosttest.c
@@ -29,13 +29,16 @@ static char *fchost_prefix;
 
 #define TEST_FC_HOST_PREFIX fchost_prefix
 #define TEST_FC_HOST_NUM 5
+#define TEST_FC_HOST_NUM_NO_FAB 7
 
 /* Test virIsCapableFCHost */
 static int
 test1(const void *data ATTRIBUTE_UNUSED)
 {
     if (virIsCapableFCHost(TEST_FC_HOST_PREFIX,
-                           TEST_FC_HOST_NUM))
+                           TEST_FC_HOST_NUM) &&
+        virIsCapableFCHost(TEST_FC_HOST_PREFIX,
+                           TEST_FC_HOST_NUM_NO_FAB))
         return 0;
 
     return -1;
@@ -106,10 +109,43 @@ test3(const void *data ATTRIBUTE_UNUSED)
     return ret;
 }
 
-/* Test virGetFCHostNameByWWN */
+/* Test virReadFCHost fabric name optional */
 static int
 test4(const void *data ATTRIBUTE_UNUSED)
 {
+    const char *expect_wwnn = "2002001b32a9da4e";
+    const char *expect_wwpn = "2102001b32a9da4e";
+    char *wwnn = NULL;
+    char *wwpn = NULL;
+    int ret = -1;
+
+    if (!(wwnn = virReadFCHost(TEST_FC_HOST_PREFIX, TEST_FC_HOST_NUM_NO_FAB,
+                               "node_name")))
+        return -1;
+
+    if (!(wwpn = virReadFCHost(TEST_FC_HOST_PREFIX, TEST_FC_HOST_NUM_NO_FAB,
+                               "port_name")))
+        goto cleanup;
+
+    if (virReadFCHost(TEST_FC_HOST_PREFIX, TEST_FC_HOST_NUM_NO_FAB,
+                      "fabric_name"))
+        goto cleanup;
+
+    if (STRNEQ(expect_wwnn, wwnn) ||
+        STRNEQ(expect_wwpn, wwpn))
+        goto cleanup;
+
+    ret = 0;
+ cleanup:
+    VIR_FREE(wwnn);
+    VIR_FREE(wwpn);
+    return ret;
+}
+
+/* Test virGetFCHostNameByWWN */
+static int
+test5(const void *data ATTRIBUTE_UNUSED)
+{
     const char *expect_hostname = "host5";
     char *hostname = NULL;
     int ret = -1;
@@ -130,7 +166,7 @@ test4(const void *data ATTRIBUTE_UNUSED)
 
 /* Test virFindFCHostCapableVport (host4 is not Online) */
 static int
-test5(const void *data ATTRIBUTE_UNUSED)
+test6(const void *data ATTRIBUTE_UNUSED)
 {
     const char *expect_hostname = "host5";
     char *hostname = NULL;
@@ -169,6 +205,8 @@ mymain(void)
         ret = -1;
     if (virTestRun("test5", test5, NULL) < 0)
         ret = -1;
+    if (virTestRun("test6", test6, NULL) < 0)
+        ret = -1;
 
  cleanup:
     VIR_FREE(fchost_prefix);
-- 
2.5.5

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