dpdk: only look at PCI information on PCI devices

The rte_device is use as a base type of all DPDK devices.
It is not valid to use container_of to find PCI information
unless the bus of the rte_device is pci. Otherwise, the
pointer is looking at some other data, which may or may not
be zero.

This change introduces a helper function to get rte_pci_device
pointer. If device is on PCI bus it returns pointer to
rte_pci_device info, otherwise it returns NULL.

Change-Id: Ia7446006bb93a7a54844969f3b3dd3b918890dfd
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/plugins/dpdk/device/common.c b/src/plugins/dpdk/device/common.c
index 8699dc8689b..b9ba161423b 100644
--- a/src/plugins/dpdk/device/common.c
+++ b/src/plugins/dpdk/device/common.c
@@ -345,6 +345,19 @@ dpdk_port_state_callback (dpdk_portid_t port_id,
   return dpdk_port_state_callback_inline (port_id, type, param);
 }
 
+/* If this device is PCI return pointer to info, otherwise NULL */
+struct rte_pci_device *
+dpdk_get_pci_device (const struct rte_eth_dev_info *info)
+{
+  const struct rte_bus *bus;
+
+  bus = rte_bus_find_by_device (info->device);
+  if (bus && !strcmp (bus->name, "pci"))
+    return RTE_DEV_TO_PCI (info->device);
+  else
+    return NULL;
+}
+
 /*
  * fd.io coding-style-patch-verification: ON
  *