[dpdk-dev] [PATCH 20/35] net/mlx5/windows: support VF PCI address

[Tal Shnaiderman <talshn@nvidia.com>]

Support VF BDF scanning by checking both the BDF and raw BDF provided by
DevX. In Linux a PCI address is formatted as: domain, bus, device,
function (DBDF).  This is right for both a PF and a VF. In Windows a PF
also has a DBDF format, but the domain is always 0, while a VF has a
special "domain" called "Virtual PCI Bus, Serial" (for example: "Virtual
PCI Bus Slot 2 Serial 2") or segment.  The full VF format under Windows
is called raw DBF.  Windows special domain must be considered and DevX
must be called to support it.

Signed-off-by: Tal Shnaiderman <talshn@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/net/mlx5/windows/mlx5_os.c | 75 +++++++++++++++++++++++++++++++++++---
 1 file changed, 70 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/windows/mlx5_os.c b/drivers/net/mlx5/windows/mlx5_os.c
index 985729f2a6..274975ecc6 100644
--- a/drivers/net/mlx5/windows/mlx5_os.c
+++ b/drivers/net/mlx5/windows/mlx5_os.c
@@ -870,6 +870,68 @@ mlx5_os_set_allmulti(struct rte_eth_dev *dev, int enable)
 	return -ENOTSUP;
 }
 
+/**
+ * Detect if a devx_device_bdf object has identical DBDF values to the
+ * rte_pci_addr found in bus/pci probing
+ *
+ * @param[in] devx_bdf
+ *   Pointer to the devx_device_bdf structure.
+ * @param[in] addr
+ *   Pointer to the rte_pci_addr structure.
+ *
+ * @return
+ *   1 on Device match, 0 on mismatch.
+ */
+static int
+mlx5_match_devx_bdf_to_addr(struct devx_device_bdf *devx_bdf,
+			    struct rte_pci_addr *addr)
+{
+	if (addr->domain != (devx_bdf->bus_id >> 8) ||
+	    addr->bus != (devx_bdf->bus_id & 0xff) ||
+	    addr->devid != devx_bdf->dev_id ||
+	    addr->function != devx_bdf->fnc_id) {
+		return 0;
+	}
+	return 1;
+}
+
+/**
+ * Detect if a devx_device_bdf object matches the rte_pci_addr
+ * found in bus/pci probing
+ * Compare both the Native/PF BDF and the raw_bdf representing a VF BDF.
+ *
+ * @param[in] devx_bdf
+ *   Pointer to the devx_device_bdf structure.
+ * @param[in] addr
+ *   Pointer to the rte_pci_addr structure.
+ *
+ * @return
+ *   1 on Device match, 0 on mismatch, rte_errno code on failure.
+ */
+static int
+mlx5_match_devx_devices_to_addr(struct devx_device_bdf *devx_bdf,
+				struct rte_pci_addr *addr)
+{
+	int err;
+	struct devx_device mlx5_dev;
+
+	if (mlx5_match_devx_bdf_to_addr(devx_bdf, addr))
+		return 1;
+	/**
+	 * Didn't match on Native/PF BDF, could still
+	 * Match a VF BDF, check it next
+	 */
+	err = mlx5_glue->query_device(devx_bdf, &mlx5_dev);
+	if (err) {
+		DRV_LOG(ERR, "query_device failed");
+		rte_errno = err;
+		return rte_errno;
+	}
+	if (mlx5_match_devx_bdf_to_addr(&mlx5_dev.raw_bdf, addr))
+		return 1;
+	return 0;
+}
+
 /**
  * DPDK callback to register a PCI device.
  *
@@ -917,7 +979,7 @@ mlx5_os_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 	struct mlx5_dev_spawn_data *list = NULL;
 	struct mlx5_dev_config dev_config;
 	unsigned int dev_config_vf;
-	int ret;
+	int ret, err;
 	uint32_t restore;
 
 	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
@@ -946,13 +1008,16 @@ mlx5_os_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 	struct devx_device_bdf *devx_bdf_match[ret + 1];
 
 	while (ret-- > 0) {
-		if (pci_dev->addr.bus != devx_bdf_devs->bus_id ||
-		    pci_dev->addr.devid != devx_bdf_devs->dev_id ||
-		    pci_dev->addr.function != devx_bdf_devs->fnc_id) {
+		err = mlx5_match_devx_devices_to_addr(devx_bdf_devs,
+		    &pci_dev->addr);
+		if (!err) {
 			devx_bdf_devs++;
 			continue;
 		}
-
+		if (err != 1) {
+			ret = -err;
+			goto exit;
+		}
 		devx_bdf_match[nd++] = devx_bdf_devs;
 	}
 	devx_bdf_match[nd] = NULL;
-- 
2.16.1.windows.4