common/sfc_efx: support getting device class

Device class argument would be used to select compatible driver.
Driver probe would be skipped for incompatible device class.

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

drivers/common/sfc_efx/sfc_efx.c

@@ -7,12 +7,61 @@
  * for Solarflare) and Solarflare Communications, Inc.
  */
 
+#include <string.h>
 #include <rte_log.h>
+#include <rte_kvargs.h>
+#include <rte_devargs.h>
 
 #include "sfc_efx_log.h"
+#include "sfc_efx.h"
 
 uint32_t sfc_efx_logtype;
 
+static int
+sfc_efx_kvarg_dev_class_handler(__rte_unused const char *key,
+				const char *class_str, void *opaque)
+{
+	enum sfc_efx_dev_class *dev_class = opaque;
+
+	if (class_str == NULL)
+		return *dev_class;
+
+	if (strcmp(class_str, "vdpa") == 0) {
+		*dev_class = SFC_EFX_DEV_CLASS_VDPA;
+	} else if (strcmp(class_str, "net") == 0) {
+		*dev_class = SFC_EFX_DEV_CLASS_NET;
+	} else {
+		SFC_EFX_LOG(ERR, "Unsupported class %s.", class_str);
+		*dev_class = SFC_EFX_DEV_CLASS_INVALID;
+	}
+
+	return 0;
+}
+
+enum sfc_efx_dev_class
+sfc_efx_dev_class_get(struct rte_devargs *devargs)
+{
+	struct rte_kvargs *kvargs;
+	const char *key = SFC_EFX_KVARG_DEV_CLASS;
+	enum sfc_efx_dev_class dev_class = SFC_EFX_DEV_CLASS_NET;
+
+	if (devargs == NULL)
+		return dev_class;
+
+	kvargs = rte_kvargs_parse(devargs->args, NULL);
+	if (kvargs == NULL)
+		return dev_class;
+
+	if (rte_kvargs_count(kvargs, key) != 0) {
+		rte_kvargs_process(kvargs, key, sfc_efx_kvarg_dev_class_handler,
+				   &dev_class);
+	}
+
+	rte_kvargs_free(kvargs);
+
+	return dev_class;
+}
+
 RTE_INIT(sfc_efx_register_logtype)
 {
 	int ret;

drivers/common/sfc_efx/sfc_efx.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright(c) 2019-2021 Xilinx, Inc.
+ * Copyright(c) 2019 Solarflare Communications Inc.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ */
+
+#ifndef _SFC_EFX_H_
+#define _SFC_EFX_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SFC_EFX_KVARG_DEV_CLASS	"class"
+
+enum sfc_efx_dev_class {
+	SFC_EFX_DEV_CLASS_INVALID = 0,
+	SFC_EFX_DEV_CLASS_NET,
+	SFC_EFX_DEV_CLASS_VDPA,
+
+	SFC_EFX_DEV_NCLASS
+};
+
+__rte_internal
+enum sfc_efx_dev_class sfc_efx_dev_class_get(struct rte_devargs *devargs);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SFC_EFX_H_ */

drivers/common/sfc_efx/version.map

@@ -221,6 +221,8 @@ INTERNAL {
 	efx_txq_nbufs;
 	efx_txq_size;
 
+	sfc_efx_dev_class_get;
+
 	sfc_efx_mcdi_init;
 	sfc_efx_mcdi_fini;