net/axgbe: use PCI root complex device to distinguish device

"bus/pci: optimize bus scan" broke axgbe on V1000/R1000.
RV root complex pci device does not have any kernel driver assigned
so it is removed from pci scan list which is used in
"net/axgbe: add a HW quirk for register definitions".

Get root complex device id directly from pci sysfs instead of
pci scan list.

Fixes: 991e0b1dbc4a ("net/axgbe: add a HW quirk for register definitions")
Cc: stable@dpdk.org
Signed-off-by: Chandubabu Namburu <chandu@amd.com>
Acked-by: Selwin Sebastian <selwin.sebastian@amd.com>

diff --git a/drivers/net/axgbe/axgbe_ethdev.c b/drivers/net/axgbe/axgbe_ethdev.c
index 76e12d12f010a984423a6808b2003dbdc0dfb086..e9546469f3ce0f28cb62e56d779a10be4e855a3f 100644 (file)
--- a/drivers/net/axgbe/axgbe_ethdev.c
+++ b/drivers/net/axgbe/axgbe_ethdev.c
@@ -10,6 +10,8 @@
 #include "axgbe_regs.h"
 #include "rte_time.h"
 
+#include "eal_filesystem.h"
+
 static int eth_axgbe_dev_init(struct rte_eth_dev *eth_dev);
 static int  axgbe_dev_configure(struct rte_eth_dev *dev);
 static int  axgbe_dev_start(struct rte_eth_dev *dev);
@@ -2117,28 +2119,27 @@ static void axgbe_default_config(struct axgbe_port *pdata)
        pdata->power_down = 0;
 }
 
-static int
-pci_device_cmp(const struct rte_device *dev, const void *_pci_id)
+/*
+ * Return PCI root complex device id on success else 0
+ */
+static uint16_t
+get_pci_rc_devid(void)
 {
-       const struct rte_pci_device *pdev = RTE_DEV_TO_PCI_CONST(dev);
-       const struct rte_pci_id *pcid = _pci_id;
+       char pci_sysfs[PATH_MAX];
+       const struct rte_pci_addr pci_rc_addr = {0, 0, 0, 0};
+       unsigned long device_id;
 
-       if (pdev->id.vendor_id == AMD_PCI_VENDOR_ID &&
-                       pdev->id.device_id == pcid->device_id)
-               return 0;
-       return 1;
-}
+       snprintf(pci_sysfs, sizeof(pci_sysfs), "%s/" PCI_PRI_FMT "/device",
+                rte_pci_get_sysfs_path(), pci_rc_addr.domain,
+                pci_rc_addr.bus, pci_rc_addr.devid, pci_rc_addr.function);
 
-static bool
-pci_search_device(int device_id)
-{
-       struct rte_bus *pci_bus;
-       struct rte_pci_id dev_id;
+       /* get device id */
+       if (eal_parse_sysfs_value(pci_sysfs, &device_id) < 0) {
+               PMD_INIT_LOG(ERR, "Error in reading PCI sysfs\n");
+               return 0;
+       }
 
-       dev_id.device_id = device_id;
-       pci_bus = rte_bus_find_by_name("pci");
-       return (pci_bus != NULL) &&
-               (pci_bus->find_device(NULL, pci_device_cmp, &dev_id) != NULL);
+       return (uint16_t)device_id;
 }
 
 /*
@@ -2180,7 +2181,7 @@ eth_axgbe_dev_init(struct rte_eth_dev *eth_dev)
        /*
         * Use root complex device ID to differentiate RV AXGBE vs SNOWY AXGBE
         */
-       if (pci_search_device(AMD_PCI_RV_ROOT_COMPLEX_ID)) {
+       if ((get_pci_rc_devid()) == AMD_PCI_RV_ROOT_COMPLEX_ID) {
                pdata->xpcs_window_def_reg = PCS_V2_RV_WINDOW_DEF;
                pdata->xpcs_window_sel_reg = PCS_V2_RV_WINDOW_SELECT;
        } else {