drivers/can/can_net.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2019 Alexander Wachter
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #include <net/can.h>
 #include <net/net_pkt.h>

 #include <logging/log.h>
 LOG_MODULE_REGISTER(net_can, CONFIG_CAN_NET_LOG_LEVEL);

 struct mcast_filter_mapping {
 	const struct in6_addr *addr;
 	int filter_id;
 };

 struct net_can_context {
 	const struct device *can_dev;
 	struct net_if *iface;
 	int recv_filter_id;
 	struct mcast_filter_mapping mcast_mapping[NET_IF_MAX_IPV6_MADDR];
 #ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
 	int eth_bridge_filter_id;
 	int all_mcast_filter_id;
 #endif
 };

 static struct net_if_mcast_monitor mcast_monitor;

 struct mcast_filter_mapping *can_get_mcast_filter(struct net_can_context *ctx,
 					      const struct in6_addr *addr)
 {
 	struct mcast_filter_mapping *map = ctx->mcast_mapping;

 	for (int i = 0; i < NET_IF_MAX_IPV6_MADDR; i++) {
 		if (map[i].addr == addr) {
 			return &map[i];
 		}
 	}

 	return NULL;
 }

 static inline uint8_t can_get_frame_datalength(struct zcan_frame *frame)
 {
 	/* TODO: Needs update when CAN FD support is added */
 	return frame->dlc;
 }

 static inline uint16_t can_get_lladdr_src(struct zcan_frame *frame)
 {
 	return (frame->id >> CAN_NET_IF_ADDR_SRC_POS) &
 	       CAN_NET_IF_ADDR_MASK;
 }

 static inline uint16_t can_get_lladdr_dest(struct zcan_frame *frame)
 {
 	uint16_t addr = (frame->id >> CAN_NET_IF_ADDR_DEST_POS) &
 		     CAN_NET_IF_ADDR_MASK;

 	if (frame->id & CAN_NET_IF_ADDR_MCAST_MASK) {
 		addr |= CAN_NET_IF_IS_MCAST_BIT;
 	}

 	return addr;
 }

 static inline void can_set_lladdr(struct net_pkt *pkt, struct zcan_frame *frame)
 {
 	struct net_buf *buf = pkt->buffer;

 	/* Put the destination at the beginning of the pkt.
 	 * The net_canbus_lladdr has a size if 14 bits. To convert it to
 	 * network byte order, we treat it as 16 bits here.
 	 */
 	net_pkt_lladdr_dst(pkt)->addr = buf->data;
 	net_pkt_lladdr_dst(pkt)->len = sizeof(struct net_canbus_lladdr);
 	net_pkt_lladdr_dst(pkt)->type = NET_LINK_CANBUS;
 	net_buf_add_be16(buf, can_get_lladdr_dest(frame));
 	net_buf_pull(buf, sizeof(uint16_t));

 	/* Do the same as above for the source address */
 	net_pkt_lladdr_src(pkt)->addr = buf->data;
 	net_pkt_lladdr_src(pkt)->len = sizeof(struct net_canbus_lladdr);
 	net_pkt_lladdr_src(pkt)->type = NET_LINK_CANBUS;
 	net_buf_add_be16(buf, can_get_lladdr_src(frame));
 	net_buf_pull(buf, sizeof(uint16_t));
 }

 static int net_can_send(const struct device *dev,
 			const struct zcan_frame *frame,
 			can_tx_callback_t cb, void *cb_arg, k_timeout_t timeout)
 {
 	struct net_can_context *ctx = dev->data;

 	NET_ASSERT(frame->id_type == CAN_EXTENDED_IDENTIFIER);
 	return can_send(ctx->can_dev, frame, timeout, cb, cb_arg);
 }

 static void net_can_recv(struct zcan_frame *frame, void *arg)
 {
 	struct net_can_context *ctx = (struct net_can_context *)arg;
 	size_t pkt_size = 2 * sizeof(struct net_canbus_lladdr) +
 			  can_get_frame_datalength(frame);
 	struct net_pkt *pkt;
 	int ret;

 	NET_DBG("Frame with ID 0x%x received", frame->id);
 	pkt = net_pkt_rx_alloc_with_buffer(ctx->iface, pkt_size, AF_UNSPEC, 0,
 					   K_NO_WAIT);
 	if (!pkt) {
 		LOG_ERR("Failed to obtain net_pkt with size of %d", pkt_size);
 		goto drop;
 	}

 	pkt->canbus_rx_ctx = NULL;

 	can_set_lladdr(pkt, frame);
 	net_pkt_cursor_init(pkt);
 	ret = net_pkt_write(pkt, frame->data, can_get_frame_datalength(frame));
 	if (ret) {
 		LOG_ERR("Failed to append frame data to net_pkt");
 		goto drop;
 	}

 	ret = net_recv_data(ctx->iface, pkt);
 	if (ret < 0) {
 		LOG_ERR("Packet dropped by NET stack");
 		goto drop;
 	}

 	return;

 drop:
 	NET_INFO("pkt dropped");

 	if (pkt) {
 		net_pkt_unref(pkt);
 	}
 }

 static inline int attach_mcast_filter(struct net_can_context *ctx,
 				      const struct in6_addr *addr)
 {
 	static struct zcan_filter filter = {
 		.id_type = CAN_EXTENDED_IDENTIFIER,
 		.rtr = CAN_DATAFRAME,
 		.rtr_mask = 1,
 		.id_mask = CAN_NET_IF_ADDR_MCAST_MASK |
 			       CAN_NET_IF_ADDR_DEST_MASK
 	};
 	const uint16_t group =
 		sys_be16_to_cpu(UNALIGNED_GET((&addr->s6_addr16[7])));
 	int filter_id;

 	filter.id = CAN_NET_IF_ADDR_MCAST_MASK |
 			((group & CAN_NET_IF_ADDR_MASK) <<
 			 CAN_NET_IF_ADDR_DEST_POS);

 	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
 				   ctx, &filter);
 	if (filter_id == CAN_NET_FILTER_NOT_SET) {
 		return CAN_NET_FILTER_NOT_SET;
 	}

 	NET_DBG("Attached mcast filter. Group 0x%04x. Filter:%d",
 		group, filter_id);

 	return filter_id;
 }

 static void mcast_cb(struct net_if *iface, const struct in6_addr *addr,
 		     bool is_joined)
 {
 	const struct device *dev = net_if_get_device(iface);
 	struct net_can_context *ctx = dev->data;
 	struct mcast_filter_mapping *filter_mapping;
 	int filter_id;

 	if (is_joined) {
 		filter_mapping = can_get_mcast_filter(ctx, NULL);
 		if (!filter_mapping) {
 			NET_ERR("Can't get a free filter_mapping");
 		}

 		filter_id = attach_mcast_filter(ctx, addr);
 		if (filter_id < 0) {
 			NET_ERR("Can't attach mcast filter");
 			return;
 		}

 		filter_mapping->addr = addr;
 		filter_mapping->filter_id = filter_id;
 	} else {
 		filter_mapping = can_get_mcast_filter(ctx, addr);
 		if (!filter_mapping) {
 			NET_ERR("No filter mapping found");
 			return;
 		}

 		can_detach(ctx->can_dev, filter_mapping->filter_id);
 		filter_mapping->addr = NULL;
 	}
 }

 static void net_can_iface_init(struct net_if *iface)
 {
 	const struct device *dev = net_if_get_device(iface);
 	struct net_can_context *ctx = dev->data;

 	ctx->iface = iface;

 	NET_DBG("Init CAN network interface %p dev %p", iface, dev);

 	net_6locan_init(iface);

 	net_if_mcast_mon_register(&mcast_monitor, iface, mcast_cb);
 }

 static int can_attach_filter(const struct device *dev, can_rx_callback_t cb,
 			     void *cb_arg,
 			     const struct zcan_filter *filter)
 {
 	struct net_can_context *ctx = dev->data;

 	return can_attach_isr(ctx->can_dev, cb, cb_arg, filter);
 }

 static void can_detach_filter(const struct device *dev, int filter_id)
 {
 	struct net_can_context *ctx = dev->data;

 	if (filter_id >= 0) {
 		can_detach(ctx->can_dev, filter_id);
 	}
 }

 static inline int can_attach_unicast_filter(struct net_can_context *ctx)
 {
 	struct zcan_filter filter = {
 		.id_type = CAN_EXTENDED_IDENTIFIER,
 		.rtr = CAN_DATAFRAME,
 		.rtr_mask = 1,
 		.id_mask = CAN_NET_IF_ADDR_DEST_MASK
 	};
 	const uint8_t *link_addr = net_if_get_link_addr(ctx->iface)->addr;
 	const uint16_t dest = sys_be16_to_cpu(UNALIGNED_GET((uint16_t *) link_addr));
 	int filter_id;

 	filter.id = (dest << CAN_NET_IF_ADDR_DEST_POS);

 	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
 				   ctx, &filter);
 	if (filter_id == CAN_NET_FILTER_NOT_SET) {
 		NET_ERR("Can't attach FF filter");
 		return CAN_NET_FILTER_NOT_SET;
 	}

 	NET_DBG("Attached FF filter %d", filter_id);

 	return filter_id;
 }

 #ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
 static inline int can_attach_eth_bridge_filter(struct net_can_context *ctx)
 {
 	const struct zcan_filter filter = {
 		.id_type = CAN_EXTENDED_IDENTIFIER,
 		.rtr = CAN_DATAFRAME,
 		.rtr_mask = 1,
 		.id_mask = CAN_NET_IF_ADDR_DEST_MASK,
 		.id = (NET_CAN_ETH_TRANSLATOR_ADDR <<
 			   CAN_NET_IF_ADDR_DEST_POS)
 	};

 	int filter_id;

 	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
 				   ctx, &filter);
 	if (filter_id == CAN_NET_FILTER_NOT_SET) {
 		NET_ERR("Can't attach ETH bridge filter");
 		return CAN_NET_FILTER_NOT_SET;
 	}

 	NET_DBG("Attached ETH bridge filter %d", filter_id);

 	return filter_id;
 }

 static inline int can_attach_all_mcast_filter(struct net_can_context *ctx)
 {
 	const struct zcan_filter filter = {
 		.id_type = CAN_EXTENDED_IDENTIFIER,
 		.rtr = CAN_DATAFRAME,
 		.rtr_mask = 1,
 		.id_mask = CAN_NET_IF_ADDR_MCAST_MASK,
 		.id = CAN_NET_IF_ADDR_MCAST_MASK
 	};

 	int filter_id;

 	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
 				   ctx, &filter);
 	if (filter_id == CAN_NET_FILTER_NOT_SET) {
 		NET_ERR("Can't attach all mcast filter");
 		return CAN_NET_FILTER_NOT_SET;
 	}

 	NET_DBG("Attached all mcast filter %d", filter_id);

 	return filter_id;
 }
 #endif /*CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR*/

 static int can_enable(const struct device *dev, bool enable)
 {
 	struct net_can_context *ctx = dev->data;

 	if (enable) {
 		if (ctx->recv_filter_id == CAN_NET_FILTER_NOT_SET) {
 			ctx->recv_filter_id = can_attach_unicast_filter(ctx);
 			if (ctx->recv_filter_id < 0) {
 				return -EIO;
 			}
 		}

 #ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
 		if (ctx->eth_bridge_filter_id == CAN_NET_FILTER_NOT_SET) {
 			ctx->eth_bridge_filter_id = can_attach_eth_bridge_filter(ctx);
 			if (ctx->eth_bridge_filter_id < 0) {
 				can_detach(ctx->can_dev, ctx->recv_filter_id);
 				return -EIO;
 			}
 		}

 		if (ctx->all_mcast_filter_id == CAN_NET_FILTER_NOT_SET) {
 			ctx->all_mcast_filter_id = can_attach_all_mcast_filter(ctx);
 			if (ctx->all_mcast_filter_id < 0) {
 				can_detach(ctx->can_dev, ctx->recv_filter_id);
 				can_detach(ctx->can_dev, ctx->eth_bridge_filter_id);
 				return -EIO;
 			}
 		}
 #endif /*CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR*/
 	} else {
 		if (ctx->recv_filter_id != CAN_NET_FILTER_NOT_SET) {
 			can_detach(ctx->can_dev, ctx->recv_filter_id);
 		}

 #ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
 		if (ctx->eth_bridge_filter_id != CAN_NET_FILTER_NOT_SET) {
 			can_detach(ctx->can_dev, ctx->eth_bridge_filter_id);
 		}

 		if (ctx->all_mcast_filter_id != CAN_NET_FILTER_NOT_SET) {
 			can_detach(ctx->can_dev, ctx->all_mcast_filter_id);
 		}
 #endif /*CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR*/
 	}

 	return 0;
 }

 static struct net_can_api net_can_api_inst = {
 	.iface_api.init = net_can_iface_init,

 	.send = net_can_send,
 	.attach_filter = can_attach_filter,
 	.detach_filter = can_detach_filter,
 	.enable = can_enable,
 };

 static int net_can_init(const struct device *dev)
 {
 	const struct device *can_dev;
 	struct net_can_context *ctx = dev->data;

 	can_dev = device_get_binding(DT_CHOSEN_ZEPHYR_CAN_PRIMARY_LABEL);

 	ctx->recv_filter_id = CAN_NET_FILTER_NOT_SET;
 #ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
 	ctx->eth_bridge_filter_id = CAN_NET_FILTER_NOT_SET;
 	ctx->all_mcast_filter_id = CAN_NET_FILTER_NOT_SET;
 #endif /*CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR*/

 	if (!can_dev) {
 		NET_ERR("Can't get binding to CAN device %s",
 			DT_CHOSEN_ZEPHYR_CAN_PRIMARY_LABEL);
 		return -EIO;
 	}

 	NET_DBG("Init net CAN device %p (%s) for dev %p (%s)",
 		dev, dev->name, can_dev, can_dev->name);

 	ctx->can_dev = can_dev;

 	return 0;
 }

 static struct net_can_context net_can_context_1;

 NET_DEVICE_INIT(net_can_1, CONFIG_CAN_NET_NAME, net_can_init,
 		NULL, &net_can_context_1, NULL,
 		CONFIG_CAN_NET_INIT_PRIORITY,
 		&net_can_api_inst,
 		CANBUS_L2, NET_L2_GET_CTX_TYPE(CANBUS_L2), NET_CAN_MTU);
	/*
	* Copyright (c) 2019 Alexander Wachter
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#include <net/can.h>
	#include <net/net_pkt.h>

	#include <logging/log.h>
	LOG_MODULE_REGISTER(net_can, CONFIG_CAN_NET_LOG_LEVEL);

	struct mcast_filter_mapping {
	const struct in6_addr *addr;
	int filter_id;
	};

	struct net_can_context {
	const struct device *can_dev;
	struct net_if *iface;
	int recv_filter_id;
	struct mcast_filter_mapping mcast_mapping[NET_IF_MAX_IPV6_MADDR];
	#ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
	int eth_bridge_filter_id;
	int all_mcast_filter_id;
	#endif
	};

	static struct net_if_mcast_monitor mcast_monitor;

	struct mcast_filter_mapping can_get_mcast_filter(struct net_can_context ctx,
	const struct in6_addr *addr)
	{
	struct mcast_filter_mapping *map = ctx->mcast_mapping;

	for (int i = 0; i < NET_IF_MAX_IPV6_MADDR; i++) {
	if (map[i].addr == addr) {
	return &map[i];
	}
	}

	return NULL;
	}

	static inline uint8_t can_get_frame_datalength(struct zcan_frame *frame)
	{
	/* TODO: Needs update when CAN FD support is added */
	return frame->dlc;
	}

	static inline uint16_t can_get_lladdr_src(struct zcan_frame *frame)
	{
	return (frame->id >> CAN_NET_IF_ADDR_SRC_POS) &
	CAN_NET_IF_ADDR_MASK;
	}

	static inline uint16_t can_get_lladdr_dest(struct zcan_frame *frame)
	{
	uint16_t addr = (frame->id >> CAN_NET_IF_ADDR_DEST_POS) &
	CAN_NET_IF_ADDR_MASK;

	if (frame->id & CAN_NET_IF_ADDR_MCAST_MASK) {
	addr \|= CAN_NET_IF_IS_MCAST_BIT;
	}

	return addr;
	}

	static inline void can_set_lladdr(struct net_pkt pkt, struct zcan_frame frame)
	{
	struct net_buf *buf = pkt->buffer;

	/* Put the destination at the beginning of the pkt.
	* The net_canbus_lladdr has a size if 14 bits. To convert it to
	* network byte order, we treat it as 16 bits here.
	*/
	net_pkt_lladdr_dst(pkt)->addr = buf->data;
	net_pkt_lladdr_dst(pkt)->len = sizeof(struct net_canbus_lladdr);
	net_pkt_lladdr_dst(pkt)->type = NET_LINK_CANBUS;
	net_buf_add_be16(buf, can_get_lladdr_dest(frame));
	net_buf_pull(buf, sizeof(uint16_t));

	/* Do the same as above for the source address */
	net_pkt_lladdr_src(pkt)->addr = buf->data;
	net_pkt_lladdr_src(pkt)->len = sizeof(struct net_canbus_lladdr);
	net_pkt_lladdr_src(pkt)->type = NET_LINK_CANBUS;
	net_buf_add_be16(buf, can_get_lladdr_src(frame));
	net_buf_pull(buf, sizeof(uint16_t));
	}

	static int net_can_send(const struct device *dev,
	const struct zcan_frame *frame,
	can_tx_callback_t cb, void *cb_arg, k_timeout_t timeout)
	{
	struct net_can_context *ctx = dev->data;

	NET_ASSERT(frame->id_type == CAN_EXTENDED_IDENTIFIER);
	return can_send(ctx->can_dev, frame, timeout, cb, cb_arg);
	}

	static void net_can_recv(struct zcan_frame frame, void arg)
	{
	struct net_can_context ctx = (struct net_can_context )arg;
	size_t pkt_size = 2 * sizeof(struct net_canbus_lladdr) +
	can_get_frame_datalength(frame);
	struct net_pkt *pkt;
	int ret;

	NET_DBG("Frame with ID 0x%x received", frame->id);
	pkt = net_pkt_rx_alloc_with_buffer(ctx->iface, pkt_size, AF_UNSPEC, 0,
	K_NO_WAIT);
	if (!pkt) {
	LOG_ERR("Failed to obtain net_pkt with size of %d", pkt_size);
	goto drop;
	}

	pkt->canbus_rx_ctx = NULL;

	can_set_lladdr(pkt, frame);
	net_pkt_cursor_init(pkt);
	ret = net_pkt_write(pkt, frame->data, can_get_frame_datalength(frame));
	if (ret) {
	LOG_ERR("Failed to append frame data to net_pkt");
	goto drop;
	}

	ret = net_recv_data(ctx->iface, pkt);
	if (ret < 0) {
	LOG_ERR("Packet dropped by NET stack");
	goto drop;
	}

	return;

	drop:
	NET_INFO("pkt dropped");

	if (pkt) {
	net_pkt_unref(pkt);
	}
	}

	static inline int attach_mcast_filter(struct net_can_context *ctx,
	const struct in6_addr *addr)
	{
	static struct zcan_filter filter = {
	.id_type = CAN_EXTENDED_IDENTIFIER,
	.rtr = CAN_DATAFRAME,
	.rtr_mask = 1,
	.id_mask = CAN_NET_IF_ADDR_MCAST_MASK \|
	CAN_NET_IF_ADDR_DEST_MASK
	};
	const uint16_t group =
	sys_be16_to_cpu(UNALIGNED_GET((&addr->s6_addr16[7])));
	int filter_id;

	filter.id = CAN_NET_IF_ADDR_MCAST_MASK \|
	((group & CAN_NET_IF_ADDR_MASK) <<
	CAN_NET_IF_ADDR_DEST_POS);

	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
	ctx, &filter);
	if (filter_id == CAN_NET_FILTER_NOT_SET) {
	return CAN_NET_FILTER_NOT_SET;
	}

	NET_DBG("Attached mcast filter. Group 0x%04x. Filter:%d",
	group, filter_id);

	return filter_id;
	}

	static void mcast_cb(struct net_if iface, const struct in6_addr addr,
	bool is_joined)
	{
	const struct device *dev = net_if_get_device(iface);
	struct net_can_context *ctx = dev->data;
	struct mcast_filter_mapping *filter_mapping;
	int filter_id;

	if (is_joined) {
	filter_mapping = can_get_mcast_filter(ctx, NULL);
	if (!filter_mapping) {
	NET_ERR("Can't get a free filter_mapping");
	}

	filter_id = attach_mcast_filter(ctx, addr);
	if (filter_id < 0) {
	NET_ERR("Can't attach mcast filter");
	return;
	}

	filter_mapping->addr = addr;
	filter_mapping->filter_id = filter_id;
	} else {
	filter_mapping = can_get_mcast_filter(ctx, addr);
	if (!filter_mapping) {
	NET_ERR("No filter mapping found");
	return;
	}

	can_detach(ctx->can_dev, filter_mapping->filter_id);
	filter_mapping->addr = NULL;
	}
	}

	static void net_can_iface_init(struct net_if *iface)
	{
	const struct device *dev = net_if_get_device(iface);
	struct net_can_context *ctx = dev->data;

	ctx->iface = iface;

	NET_DBG("Init CAN network interface %p dev %p", iface, dev);

	net_6locan_init(iface);

	net_if_mcast_mon_register(&mcast_monitor, iface, mcast_cb);
	}

	static int can_attach_filter(const struct device *dev, can_rx_callback_t cb,
	void *cb_arg,
	const struct zcan_filter *filter)
	{
	struct net_can_context *ctx = dev->data;

	return can_attach_isr(ctx->can_dev, cb, cb_arg, filter);
	}

	static void can_detach_filter(const struct device *dev, int filter_id)
	{
	struct net_can_context *ctx = dev->data;

	if (filter_id >= 0) {
	can_detach(ctx->can_dev, filter_id);
	}
	}

	static inline int can_attach_unicast_filter(struct net_can_context *ctx)
	{
	struct zcan_filter filter = {
	.id_type = CAN_EXTENDED_IDENTIFIER,
	.rtr = CAN_DATAFRAME,
	.rtr_mask = 1,
	.id_mask = CAN_NET_IF_ADDR_DEST_MASK
	};
	const uint8_t *link_addr = net_if_get_link_addr(ctx->iface)->addr;
	const uint16_t dest = sys_be16_to_cpu(UNALIGNED_GET((uint16_t *) link_addr));
	int filter_id;

	filter.id = (dest << CAN_NET_IF_ADDR_DEST_POS);

	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
	ctx, &filter);
	if (filter_id == CAN_NET_FILTER_NOT_SET) {
	NET_ERR("Can't attach FF filter");
	return CAN_NET_FILTER_NOT_SET;
	}

	NET_DBG("Attached FF filter %d", filter_id);

	return filter_id;
	}

	#ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
	static inline int can_attach_eth_bridge_filter(struct net_can_context *ctx)
	{
	const struct zcan_filter filter = {
	.id_type = CAN_EXTENDED_IDENTIFIER,
	.rtr = CAN_DATAFRAME,
	.rtr_mask = 1,
	.id_mask = CAN_NET_IF_ADDR_DEST_MASK,
	.id = (NET_CAN_ETH_TRANSLATOR_ADDR <<
	CAN_NET_IF_ADDR_DEST_POS)
	};

	int filter_id;

	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
	ctx, &filter);
	if (filter_id == CAN_NET_FILTER_NOT_SET) {
	NET_ERR("Can't attach ETH bridge filter");
	return CAN_NET_FILTER_NOT_SET;
	}

	NET_DBG("Attached ETH bridge filter %d", filter_id);

	return filter_id;
	}

	static inline int can_attach_all_mcast_filter(struct net_can_context *ctx)
	{
	const struct zcan_filter filter = {
	.id_type = CAN_EXTENDED_IDENTIFIER,
	.rtr = CAN_DATAFRAME,
	.rtr_mask = 1,
	.id_mask = CAN_NET_IF_ADDR_MCAST_MASK,
	.id = CAN_NET_IF_ADDR_MCAST_MASK
	};

	int filter_id;

	filter_id = can_attach_isr(ctx->can_dev, net_can_recv,
	ctx, &filter);
	if (filter_id == CAN_NET_FILTER_NOT_SET) {
	NET_ERR("Can't attach all mcast filter");
	return CAN_NET_FILTER_NOT_SET;
	}

	NET_DBG("Attached all mcast filter %d", filter_id);

	return filter_id;
	}
	#endif /CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR/

	static int can_enable(const struct device *dev, bool enable)
	{
	struct net_can_context *ctx = dev->data;

	if (enable) {
	if (ctx->recv_filter_id == CAN_NET_FILTER_NOT_SET) {
	ctx->recv_filter_id = can_attach_unicast_filter(ctx);
	if (ctx->recv_filter_id < 0) {
	return -EIO;
	}
	}

	#ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
	if (ctx->eth_bridge_filter_id == CAN_NET_FILTER_NOT_SET) {
	ctx->eth_bridge_filter_id = can_attach_eth_bridge_filter(ctx);
	if (ctx->eth_bridge_filter_id < 0) {
	can_detach(ctx->can_dev, ctx->recv_filter_id);
	return -EIO;
	}
	}

	if (ctx->all_mcast_filter_id == CAN_NET_FILTER_NOT_SET) {
	ctx->all_mcast_filter_id = can_attach_all_mcast_filter(ctx);
	if (ctx->all_mcast_filter_id < 0) {
	can_detach(ctx->can_dev, ctx->recv_filter_id);
	can_detach(ctx->can_dev, ctx->eth_bridge_filter_id);
	return -EIO;
	}
	}
	#endif /CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR/
	} else {
	if (ctx->recv_filter_id != CAN_NET_FILTER_NOT_SET) {
	can_detach(ctx->can_dev, ctx->recv_filter_id);
	}

	#ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
	if (ctx->eth_bridge_filter_id != CAN_NET_FILTER_NOT_SET) {
	can_detach(ctx->can_dev, ctx->eth_bridge_filter_id);
	}

	if (ctx->all_mcast_filter_id != CAN_NET_FILTER_NOT_SET) {
	can_detach(ctx->can_dev, ctx->all_mcast_filter_id);
	}
	#endif /CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR/
	}

	return 0;
	}

	static struct net_can_api net_can_api_inst = {
	.iface_api.init = net_can_iface_init,

	.send = net_can_send,
	.attach_filter = can_attach_filter,
	.detach_filter = can_detach_filter,
	.enable = can_enable,
	};

	static int net_can_init(const struct device *dev)
	{
	const struct device *can_dev;
	struct net_can_context *ctx = dev->data;

	can_dev = device_get_binding(DT_CHOSEN_ZEPHYR_CAN_PRIMARY_LABEL);

	ctx->recv_filter_id = CAN_NET_FILTER_NOT_SET;
	#ifdef CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR
	ctx->eth_bridge_filter_id = CAN_NET_FILTER_NOT_SET;
	ctx->all_mcast_filter_id = CAN_NET_FILTER_NOT_SET;
	#endif /CONFIG_NET_L2_CANBUS_ETH_TRANSLATOR/

	if (!can_dev) {
	NET_ERR("Can't get binding to CAN device %s",
	DT_CHOSEN_ZEPHYR_CAN_PRIMARY_LABEL);
	return -EIO;
	}

	NET_DBG("Init net CAN device %p (%s) for dev %p (%s)",
	dev, dev->name, can_dev, can_dev->name);

	ctx->can_dev = can_dev;

	return 0;
	}

	static struct net_can_context net_can_context_1;

	NET_DEVICE_INIT(net_can_1, CONFIG_CAN_NET_NAME, net_can_init,
	NULL, &net_can_context_1, NULL,
	CONFIG_CAN_NET_INIT_PRIORITY,
	&net_can_api_inst,
	CANBUS_L2, NET_L2_GET_CTX_TYPE(CANBUS_L2), NET_CAN_MTU);