net/sfc: skip driver probe for incompatible device class

Driver would be probed only for the net device class.

Signed-off-by: Vijay Kumar Srivastava <vsrivast@xilinx.com>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

doc/guides/nics/sfc_efx.rst

@@ -357,6 +357,14 @@ allow option like "-a 02:00.0,arg1=value1,...".
 Case-insensitive 1/y/yes/on or 0/n/no/off may be used to specify
 boolean parameters value.
 
+- ``class`` [net|vdpa] (default **net**)
+
+  Choose the mode of operation of ef100 device.
+  **net** device will work as network device and will be probed by net/sfc driver.
+  **vdpa** device will work as vdpa device and will be probed by vdpa/sfc driver.
+  If this parameter is not specified then ef100 device will operate as
+  network device.
+
 - ``rx_datapath`` [auto|efx|ef10|ef10_essb] (default **auto**)
 
   Choose receive datapath implementation.

drivers/net/sfc/sfc.h

@@ -22,6 +22,7 @@
 #include "efx.h"
 
 #include "sfc_efx_mcdi.h"
+#include "sfc_efx.h"
 
 #include "sfc_debug.h"
 #include "sfc_log.h"

drivers/net/sfc/sfc_ethdev.c

@@ -2161,6 +2161,13 @@ sfc_eth_dev_init(struct rte_eth_dev *dev)
 	const struct rte_ether_addr *from;
 	int ret;
 
+	if (sfc_efx_dev_class_get(pci_dev->device.devargs) !=
+			SFC_EFX_DEV_CLASS_NET) {
+		SFC_GENERIC_LOG(DEBUG,
+			"Incompatible device class: skip probing, should be probed by other sfc driver.");
+		return 1;
+	}
+
 	sfc_register_dp();
 
 	logtype_main = sfc_register_logtype(&pci_dev->addr,

drivers/net/sfc/sfc_kvargs.c

@@ -28,6 +28,7 @@ sfc_kvargs_parse(struct sfc_adapter *sa)
 		SFC_KVARG_TX_DATAPATH,
 		SFC_KVARG_FW_VARIANT,
 		SFC_KVARG_RXD_WAIT_TIMEOUT_NS,
+		SFC_EFX_KVARG_DEV_CLASS,
 		NULL,
 	};