[dpdk-dev] [PATCH v4] net/axgbe: add a HW quirk for register definitions

[Selwin Sebastian]

V1000/R1000 processors are using the same PCI ids for the network
device as SNOWYOWL processor but has altered register definitions
for determining the window settings for the indirect PCS access.
Add support to check for this hardware and if found use the new
register values.

Signed-off-by: Selwin Sebastian <Selwin.Sebastian at amd.com>
---
 drivers/net/axgbe/axgbe_common.h |  2 ++
 drivers/net/axgbe/axgbe_ethdev.c | 40 +++++++++++++++++++++++++++++---
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/drivers/net/axgbe/axgbe_common.h b/drivers/net/axgbe/axgbe_common.h
index 34f60f156..4a3fbac16 100644
--- a/drivers/net/axgbe/axgbe_common.h
+++ b/drivers/net/axgbe/axgbe_common.h
@@ -841,6 +841,8 @@
 #define PCS_V1_WINDOW_SELECT		0x03fc
 #define PCS_V2_WINDOW_DEF		0x9060
 #define PCS_V2_WINDOW_SELECT		0x9064
+#define PCS_V2_RV_WINDOW_DEF		0x1060
+#define PCS_V2_RV_WINDOW_SELECT		0x1064
 
 /* PCS register entry bit positions and sizes */
 #define PCS_V2_WINDOW_DEF_OFFSET_INDEX	6
diff --git a/drivers/net/axgbe/axgbe_ethdev.c b/drivers/net/axgbe/axgbe_ethdev.c
index d1f160e79..f5dbba292 100644
--- a/drivers/net/axgbe/axgbe_ethdev.c
+++ b/drivers/net/axgbe/axgbe_ethdev.c
@@ -29,6 +29,7 @@ static int  axgbe_dev_info_get(struct rte_eth_dev *dev,
 
 /* 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_AXGBE_DEVICE_V2A 0x1458
 #define AMD_PCI_AXGBE_DEVICE_V2B 0x1459
 
@@ -574,6 +575,29 @@ static void axgbe_default_config(struct axgbe_port *pdata)
 	pdata->power_down = 0;
 }
 
+static inline int
+pci_device_cmp(const struct rte_device *dev, const void *_pci_id)
+{
+	const struct rte_pci_device *pdev = RTE_DEV_TO_PCI_CONST(dev);
+	const struct rte_pci_id *pcid = _pci_id;
+
+	if (pdev->id.vendor_id == AMD_PCI_VENDOR_ID &&
+			pdev->id.device_id == pcid->device_id)
+		return 0;
+	return 1;
+}
+
+static bool pci_search_device(int device_id)
+{
+	struct rte_bus *pci_bus;
+	struct rte_pci_id dev_id;
+
+	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);
+}
+
 /*
  * It returns 0 on success.
  */
@@ -605,6 +629,17 @@ eth_axgbe_dev_init(struct rte_eth_dev *eth_dev)
 	pci_dev = RTE_DEV_TO_PCI(eth_dev->device);
 	pdata->pci_dev = pci_dev;
 
+	/*
+	 * Use root complex device ID to differentiate RV AXGBE vs SNOWY AXGBE
+	 */
+	if (pci_search_device(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 {
+		pdata->xpcs_window_def_reg = PCS_V2_WINDOW_DEF;
+		pdata->xpcs_window_sel_reg = PCS_V2_WINDOW_SELECT;
+	}
+
 	pdata->xgmac_regs =
 		(void *)pci_dev->mem_resource[AXGBE_AXGMAC_BAR].addr;
 	pdata->xprop_regs = (void *)((uint8_t *)pdata->xgmac_regs
@@ -620,14 +655,13 @@ eth_axgbe_dev_init(struct rte_eth_dev *eth_dev)
 		pdata->vdata = &axgbe_v2b;
 
 	/* Configure the PCS indirect addressing support */
-	reg = XPCS32_IOREAD(pdata, PCS_V2_WINDOW_DEF);
+	reg = XPCS32_IOREAD(pdata, pdata->xpcs_window_def_reg);
 	pdata->xpcs_window = XPCS_GET_BITS(reg, PCS_V2_WINDOW_DEF, OFFSET);
 	pdata->xpcs_window <<= 6;
 	pdata->xpcs_window_size = XPCS_GET_BITS(reg, PCS_V2_WINDOW_DEF, SIZE);
 	pdata->xpcs_window_size = 1 << (pdata->xpcs_window_size + 7);
 	pdata->xpcs_window_mask = pdata->xpcs_window_size - 1;
-	pdata->xpcs_window_def_reg = PCS_V2_WINDOW_DEF;
-	pdata->xpcs_window_sel_reg = PCS_V2_WINDOW_SELECT;
+
 	PMD_INIT_LOG(DEBUG,
 		     "xpcs window :%x, size :%x, mask :%x ", pdata->xpcs_window,
 		     pdata->xpcs_window_size, pdata->xpcs_window_mask);
-- 
2.17.1