ethdev: register as a class

Implement the operators of an rte_class for the
ethdev abstraction layer.

Register the layer as such.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>

lib/librte_ethdev/Makefile

@@ -12,7 +12,7 @@ CFLAGS += -DALLOW_EXPERIMENTAL_API
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
 LDLIBS += -lrte_net -lrte_eal -lrte_mempool -lrte_ring
-LDLIBS += -lrte_mbuf
+LDLIBS += -lrte_mbuf -lrte_kvargs
 
 EXPORT_MAP := rte_ethdev_version.map
 
@@ -20,6 +20,7 @@ LIBABIVER := 10
 
 SRCS-y += ethdev_private.c
 SRCS-y += rte_ethdev.c
+SRCS-y += rte_class_eth.c
 SRCS-y += rte_flow.c
 SRCS-y += rte_tm.c
 SRCS-y += rte_mtr.c

lib/librte_ethdev/meson.build

@@ -6,6 +6,7 @@ version = 10
 allow_experimental_apis = true
 sources = files('ethdev_private.c',
 	'ethdev_profile.c',
+	'rte_class_eth.c',
 	'rte_ethdev.c',
 	'rte_flow.c',
 	'rte_mtr.c',

lib/librte_ethdev/rte_class_eth.c

@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Gaëtan Rivet
+ */
+
+#include <string.h>
+
+#include <rte_class.h>
+#include <rte_compat.h>
+#include <rte_errno.h>
+#include <rte_kvargs.h>
+#include <rte_log.h>
+
+#include "rte_ethdev.h"
+#include "rte_ethdev_core.h"
+#include "ethdev_private.h"
+
+enum eth_params {
+	RTE_ETH_PARAMS_MAX,
+};
+
+static const char * const eth_params_keys[] = {
+	[RTE_ETH_PARAMS_MAX] = NULL,
+};
+
+struct eth_dev_match_arg {
+	struct rte_device *device;
+	struct rte_kvargs *kvlist;
+};
+
+#define eth_dev_match_arg(d, k) \
+	(&(const struct eth_dev_match_arg) { \
+		.device = (d), \
+		.kvlist = (k), \
+	})
+
+static int
+eth_dev_match(const struct rte_eth_dev *edev,
+	      const void *_arg)
+{
+	const struct eth_dev_match_arg *arg = _arg;
+	const struct rte_kvargs *kvlist = arg->kvlist;
+
+	if (edev->state == RTE_ETH_DEV_UNUSED)
+		return -1;
+	if (edev->device != arg->device)
+		return -1;
+	if (kvlist == NULL)
+		/* Empty string matches everything. */
+		return 0;
+	return 0;
+}
+
+static void *
+eth_dev_iterate(const void *start,
+		const char *str,
+		const struct rte_dev_iterator *it)
+{
+	struct rte_kvargs *kvargs = NULL;
+	struct rte_eth_dev *edev = NULL;
+
+	if (str != NULL) {
+		kvargs = rte_kvargs_parse(str, eth_params_keys);
+		if (kvargs == NULL) {
+			RTE_LOG(ERR, EAL, "cannot parse argument list\n");
+			rte_errno = EINVAL;
+			return NULL;
+		}
+	}
+	edev = eth_find_device(start, eth_dev_match,
+			       eth_dev_match_arg(it->device, kvargs));
+	rte_kvargs_free(kvargs);
+	return edev;
+}
+
+struct rte_class rte_class_eth = {
+	.dev_iterate = eth_dev_iterate,
+};
+
+RTE_REGISTER_CLASS(eth, rte_class_eth);