RE: [PATCH] net/axgbe: fix PCI ID to distinguish v1000 vs e3000

["Namburu, Chandu-babu" <chandu@amd.com>]

[AMD Official Use Only]

Hi Arsalan Awan,

Thank you for sharing the patch. DPDK not working on V1000 is regression due to "bus/pci: optimize bus scan" patch. As RV Root Complex device does not have any Linux kernel driver assigned, this device is removed from PCI scan list and not found using pcie_search_device() routine.

Patch submitted is potential fix for the issue, but we are checking if this is the best way to fix regression. Will update you soon on the fix shared.

Regards,
Chandu

-----Original Message-----
From: Arsalan H. Awan <Arsalan_Awan@mentor.com>
Sent: Wednesday, November 10, 2021 5:15 PM
To: dev@dpdk.org
Cc: Namburu, Chandu-babu <chandu@amd.com>; Somalapuram, Amaranath <Amaranath.Somalapuram@amd.com>; Sebastian, Selwin <Selwin.Sebastian@amd.com>; Giriyapura, Maheshwaramurthy <Maheshwaramurthy.Giriyapura@amd.com>; Arsalan H. Awan <Arsalan_Awan@mentor.com>
Subject: [PATCH] net/axgbe: fix PCI ID to distinguish v1000 vs e3000

The RV PCI Root Complex Device is not visible to DPDK on the PCI bus via pci_search_device on some OSs including Ubuntu and Yocto. This makes it impossible to determine which machine DPDK/axgbe is running on. As a result, DPDK/axgbe does not work on v1000.

Let's use the Raven Internal PCIe GPP Bridge ID that DPDK can see on the PCI bus that exists on the v1000 to differentiate between RV AXGBE and SNOWY AXGBE, and set the registers accordingly. This fixes DPDK not working on v1000 platform.

Signed-off-by: Arsalan H. Awan <Arsalan_Awan@mentor.com>
---
 drivers/net/axgbe/axgbe_ethdev.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/axgbe/axgbe_ethdev.c b/drivers/net/axgbe/axgbe_ethdev.c
index 7d40c18a86..7b1b46990f 100644
--- a/drivers/net/axgbe/axgbe_ethdev.c
+++ b/drivers/net/axgbe/axgbe_ethdev.c
@@ -170,7 +170,7 @@ static const struct axgbe_xstats axgbe_xstats_strings[] = {

 /* The set of PCI devices this driver supports */
 #define AMD_PCI_VENDOR_ID       0x1022
-#define AMD_PCI_RV_ROOT_COMPLEX_ID     0x15d0
+#define AMD_PCI_RV_INTERNAL_PCIE_GPP_BRIDGE_ID 0x15db
 #define AMD_PCI_AXGBE_DEVICE_V2A 0x1458  #define AMD_PCI_AXGBE_DEVICE_V2B 0x1459

@@ -2178,9 +2178,9 @@ eth_axgbe_dev_init(struct rte_eth_dev *eth_dev)
        pdata->pci_dev = pci_dev;

        /*
-        * Use root complex device ID to differentiate RV AXGBE vs SNOWY AXGBE
+        * Use Raven Internal PCIe GPP Bridge device ID to differentiate RV
+AXGBE vs SNOWY AXGBE
         */
-       if (pci_search_device(AMD_PCI_RV_ROOT_COMPLEX_ID)) {
+       if (pci_search_device(AMD_PCI_RV_INTERNAL_PCIE_GPP_BRIDGE_ID)) {
                pdata->xpcs_window_def_reg = PCS_V2_RV_WINDOW_DEF;
                pdata->xpcs_window_sel_reg = PCS_V2_RV_WINDOW_SELECT;
        } else {
--
2.17.1