Rework of DPDK PCI device uio driver binding process

This is complete rework of DPDK PCI initialization. It drops
previous scheme where lspci/route/awk/sed are used and instead
sysfs is solely used for discovering Ethernet PCI devices. Criteria
for blacklisting device is changed from exsiting routing table entry
to simple interface state obtained by SIOCGIFFLAGS ioctl().
It checks for IFF_UP flag, so as long as interface is declared
up and even when carrier is down interface will be blacklisted.

Change-Id: I59961ddcf1c19c728934e7fe746f343983741bf1
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/vlib/vlib/unix/util.c b/vlib/vlib/unix/util.c
new file mode 100644
index 00000000000..d64036024bf
--- /dev/null
+++ b/vlib/vlib/unix/util.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * pci.c: Linux user space PCI bus management.
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+
+clib_error_t *
+foreach_directory_file (char * dir_name,
+			clib_error_t * (* f) (void * arg, u8 * path_name, u8 * file_name),
+			void * arg,
+			int scan_dirs)
+{
+  DIR * d;
+  struct dirent * e;
+  clib_error_t * error = 0;
+  u8 * s, * t;
+
+  d = opendir (dir_name);
+  if (! d)
+    {
+      /* System has no PCI bus. */
+      if (errno == ENOENT)
+        return 0;
+      return clib_error_return_unix (0, "open `%s'", dir_name);
+    }
+
+  s = t = 0;
+  while (1)
+    {
+      e = readdir (d);
+      if (! e)
+	break;
+      if (scan_dirs)
+	{
+	  if (e->d_type == DT_DIR
+	      && (! strcmp (e->d_name, ".")
+		  || ! strcmp (e->d_name, "..")))
+	    continue;
+	}
+      else
+	{
+	  if (e->d_type == DT_DIR)
+	    continue;
+	}
+
+      s = format (s, "%s/%s", dir_name, e->d_name);
+      t = format (t, "%s", e->d_name);
+      error = f (arg, s, t);
+      _vec_len (s) = 0;
+      _vec_len (t) = 0;
+
+      if (error)
+	break;
+    }
+
+  vec_free (s);
+  closedir (d);
+
+  return error;
+}
+
+clib_error_t *
+write_sys_fs (char * file_name, char * fmt, ...)
+{
+  u8 * s;
+  int fd;
+
+  fd = open (file_name, O_WRONLY);
+  if (fd < 0)
+    return clib_error_return_unix (0, "open `%s'", file_name);
+
+  va_list va;
+  va_start (va, fmt);
+  s = va_format (0, fmt, &va);
+  va_end (va);
+
+  if (write (fd, s, vec_len (s)) < 0)
+    return clib_error_return_unix (0, "write `%s'", file_name);
+
+  vec_free (s);
+  close (fd);
+  return 0;
+}
+
+clib_error_t *
+read_sys_fs (char * file_name, char * fmt, ...)
+{
+  unformat_input_t input;
+  u8 * s = 0;
+  int fd;
+  ssize_t sz;
+  uword result;
+
+  fd = open (file_name, O_RDONLY);
+  if (fd < 0)
+    return clib_error_return_unix (0, "open `%s'", file_name);
+
+  vec_validate(s, 4095);
+
+  sz = read(fd, s, vec_len (s));
+  if (sz < 0)
+    {
+      close(fd);
+      vec_free(s);
+      return clib_error_return_unix (0, "read `%s'", file_name);
+    }
+
+  _vec_len(s) = sz;
+  unformat_init_vector(&input, s);
+
+  va_list va;
+  va_start (va, fmt);
+  result = va_unformat (&input, fmt, &va);
+  va_end (va);
+
+  vec_free (s);
+  close (fd);
+
+  if (result == 0)
+    return clib_error_return (0, "unformat error");
+
+  return 0;
+}
+