Adding upstream version 4.19.304.upstream/4.19.304upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 1324 deletions

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
deleted file mode 100644
index 8738d37f7..000000000
--- a/drivers/net/can/dev.c
+++ /dev/null
@@ -1,1324 +0,0 @@
-/*
- * Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
- * Copyright (C) 2006 Andrey Volkov, Varma Electronics
- * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the version 2 of the GNU General Public License
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/netdevice.h>
-#include <linux/if_arp.h>
-#include <linux/workqueue.h>
-#include <linux/can.h>
-#include <linux/can/dev.h>
-#include <linux/can/skb.h>
-#include <linux/can/netlink.h>
-#include <linux/can/led.h>
-#include <linux/of.h>
-#include <net/rtnetlink.h>
-
-#define MOD_DESC "CAN device driver interface"
-
-MODULE_DESCRIPTION(MOD_DESC);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
-
-/* CAN DLC to real data length conversion helpers */
-
-static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7,
-			     8, 12, 16, 20, 24, 32, 48, 64};
-
-/* get data length from can_dlc with sanitized can_dlc */
-u8 can_dlc2len(u8 can_dlc)
-{
-	return dlc2len[can_dlc & 0x0F];
-}
-EXPORT_SYMBOL_GPL(can_dlc2len);
-
-static const u8 len2dlc[] = {0, 1, 2, 3, 4, 5, 6, 7, 8,		/* 0 - 8 */
-			     9, 9, 9, 9,			/* 9 - 12 */
-			     10, 10, 10, 10,			/* 13 - 16 */
-			     11, 11, 11, 11,			/* 17 - 20 */
-			     12, 12, 12, 12,			/* 21 - 24 */
-			     13, 13, 13, 13, 13, 13, 13, 13,	/* 25 - 32 */
-			     14, 14, 14, 14, 14, 14, 14, 14,	/* 33 - 40 */
-			     14, 14, 14, 14, 14, 14, 14, 14,	/* 41 - 48 */
-			     15, 15, 15, 15, 15, 15, 15, 15,	/* 49 - 56 */
-			     15, 15, 15, 15, 15, 15, 15, 15};	/* 57 - 64 */
-
-/* map the sanitized data length to an appropriate data length code */
-u8 can_len2dlc(u8 len)
-{
-	if (unlikely(len > 64))
-		return 0xF;
-
-	return len2dlc[len];
-}
-EXPORT_SYMBOL_GPL(can_len2dlc);
-
-#ifdef CONFIG_CAN_CALC_BITTIMING
-#define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */
-#define CAN_CALC_SYNC_SEG 1
-
-/*
- * Bit-timing calculation derived from:
- *
- * Code based on LinCAN sources and H8S2638 project
- * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz
- * Copyright 2005      Stanislav Marek
- * email: pisa@cmp.felk.cvut.cz
- *
- * Calculates proper bit-timing parameters for a specified bit-rate
- * and sample-point, which can then be used to set the bit-timing
- * registers of the CAN controller. You can find more information
- * in the header file linux/can/netlink.h.
- */
-static int can_update_sample_point(const struct can_bittiming_const *btc,
-			  unsigned int sample_point_nominal, unsigned int tseg,
-			  unsigned int *tseg1_ptr, unsigned int *tseg2_ptr,
-			  unsigned int *sample_point_error_ptr)
-{
-	unsigned int sample_point_error, best_sample_point_error = UINT_MAX;
-	unsigned int sample_point, best_sample_point = 0;
-	unsigned int tseg1, tseg2;
-	int i;
-
-	for (i = 0; i <= 1; i++) {
-		tseg2 = tseg + CAN_CALC_SYNC_SEG - (sample_point_nominal * (tseg + CAN_CALC_SYNC_SEG)) / 1000 - i;
-		tseg2 = clamp(tseg2, btc->tseg2_min, btc->tseg2_max);
-		tseg1 = tseg - tseg2;
-		if (tseg1 > btc->tseg1_max) {
-			tseg1 = btc->tseg1_max;
-			tseg2 = tseg - tseg1;
-		}
-
-		sample_point = 1000 * (tseg + CAN_CALC_SYNC_SEG - tseg2) / (tseg + CAN_CALC_SYNC_SEG);
-		sample_point_error = abs(sample_point_nominal - sample_point);
-
-		if ((sample_point <= sample_point_nominal) && (sample_point_error < best_sample_point_error)) {
-			best_sample_point = sample_point;
-			best_sample_point_error = sample_point_error;
-			*tseg1_ptr = tseg1;
-			*tseg2_ptr = tseg2;
-		}
-	}
-
-	if (sample_point_error_ptr)
-		*sample_point_error_ptr = best_sample_point_error;
-
-	return best_sample_point;
-}
-
-static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
-			      const struct can_bittiming_const *btc)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	unsigned int bitrate;			/* current bitrate */
-	unsigned int bitrate_error;		/* difference between current and nominal value */
-	unsigned int best_bitrate_error = UINT_MAX;
-	unsigned int sample_point_error;	/* difference between current and nominal value */
-	unsigned int best_sample_point_error = UINT_MAX;
-	unsigned int sample_point_nominal;	/* nominal sample point */
-	unsigned int best_tseg = 0;		/* current best value for tseg */
-	unsigned int best_brp = 0;		/* current best value for brp */
-	unsigned int brp, tsegall, tseg, tseg1 = 0, tseg2 = 0;
-	u64 v64;
-
-	/* Use CiA recommended sample points */
-	if (bt->sample_point) {
-		sample_point_nominal = bt->sample_point;
-	} else {
-		if (bt->bitrate > 800000)
-			sample_point_nominal = 750;
-		else if (bt->bitrate > 500000)
-			sample_point_nominal = 800;
-		else
-			sample_point_nominal = 875;
-	}
-
-	/* tseg even = round down, odd = round up */
-	for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1;
-	     tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) {
-		tsegall = CAN_CALC_SYNC_SEG + tseg / 2;
-
-		/* Compute all possible tseg choices (tseg=tseg1+tseg2) */
-		brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2;
-
-		/* choose brp step which is possible in system */
-		brp = (brp / btc->brp_inc) * btc->brp_inc;
-		if ((brp < btc->brp_min) || (brp > btc->brp_max))
-			continue;
-
-		bitrate = priv->clock.freq / (brp * tsegall);
-		bitrate_error = abs(bt->bitrate - bitrate);
-
-		/* tseg brp biterror */
-		if (bitrate_error > best_bitrate_error)
-			continue;
-
-		/* reset sample point error if we have a better bitrate */
-		if (bitrate_error < best_bitrate_error)
-			best_sample_point_error = UINT_MAX;
-
-		can_update_sample_point(btc, sample_point_nominal, tseg / 2, &tseg1, &tseg2, &sample_point_error);
-		if (sample_point_error > best_sample_point_error)
-			continue;
-
-		best_sample_point_error = sample_point_error;
-		best_bitrate_error = bitrate_error;
-		best_tseg = tseg / 2;
-		best_brp = brp;
-
-		if (bitrate_error == 0 && sample_point_error == 0)
-			break;
-	}
-
-	if (best_bitrate_error) {
-		/* Error in one-tenth of a percent */
-		v64 = (u64)best_bitrate_error * 1000;
-		do_div(v64, bt->bitrate);
-		bitrate_error = (u32)v64;
-		if (bitrate_error > CAN_CALC_MAX_ERROR) {
-			netdev_err(dev,
-				   "bitrate error %d.%d%% too high\n",
-				   bitrate_error / 10, bitrate_error % 10);
-			return -EDOM;
-		}
-		netdev_warn(dev, "bitrate error %d.%d%%\n",
-			    bitrate_error / 10, bitrate_error % 10);
-	}
-
-	/* real sample point */
-	bt->sample_point = can_update_sample_point(btc, sample_point_nominal, best_tseg,
-					  &tseg1, &tseg2, NULL);
-
-	v64 = (u64)best_brp * 1000 * 1000 * 1000;
-	do_div(v64, priv->clock.freq);
-	bt->tq = (u32)v64;
-	bt->prop_seg = tseg1 / 2;
-	bt->phase_seg1 = tseg1 - bt->prop_seg;
-	bt->phase_seg2 = tseg2;
-
-	/* check for sjw user settings */
-	if (!bt->sjw || !btc->sjw_max) {
-		bt->sjw = 1;
-	} else {
-		/* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
-		if (bt->sjw > btc->sjw_max)
-			bt->sjw = btc->sjw_max;
-		/* bt->sjw must not be higher than tseg2 */
-		if (tseg2 < bt->sjw)
-			bt->sjw = tseg2;
-	}
-
-	bt->brp = best_brp;
-
-	/* real bitrate */
-	bt->bitrate = priv->clock.freq / (bt->brp * (CAN_CALC_SYNC_SEG + tseg1 + tseg2));
-
-	return 0;
-}
-#else /* !CONFIG_CAN_CALC_BITTIMING */
-static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
-			      const struct can_bittiming_const *btc)
-{
-	netdev_err(dev, "bit-timing calculation not available\n");
-	return -EINVAL;
-}
-#endif /* CONFIG_CAN_CALC_BITTIMING */
-
-/*
- * Checks the validity of the specified bit-timing parameters prop_seg,
- * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
- * prescaler value brp. You can find more information in the header
- * file linux/can/netlink.h.
- */
-static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt,
-			       const struct can_bittiming_const *btc)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	int tseg1, alltseg;
-	u64 brp64;
-
-	tseg1 = bt->prop_seg + bt->phase_seg1;
-	if (!bt->sjw)
-		bt->sjw = 1;
-	if (bt->sjw > btc->sjw_max ||
-	    tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max ||
-	    bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max)
-		return -ERANGE;
-
-	brp64 = (u64)priv->clock.freq * (u64)bt->tq;
-	if (btc->brp_inc > 1)
-		do_div(brp64, btc->brp_inc);
-	brp64 += 500000000UL - 1;
-	do_div(brp64, 1000000000UL); /* the practicable BRP */
-	if (btc->brp_inc > 1)
-		brp64 *= btc->brp_inc;
-	bt->brp = (u32)brp64;
-
-	if (bt->brp < btc->brp_min || bt->brp > btc->brp_max)
-		return -EINVAL;
-
-	alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1;
-	bt->bitrate = priv->clock.freq / (bt->brp * alltseg);
-	bt->sample_point = ((tseg1 + 1) * 1000) / alltseg;
-
-	return 0;
-}
-
-/* Checks the validity of predefined bitrate settings */
-static int can_validate_bitrate(struct net_device *dev, struct can_bittiming *bt,
-				const u32 *bitrate_const,
-				const unsigned int bitrate_const_cnt)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	unsigned int i;
-
-	for (i = 0; i < bitrate_const_cnt; i++) {
-		if (bt->bitrate == bitrate_const[i])
-			break;
-	}
-
-	if (i >= priv->bitrate_const_cnt)
-		return -EINVAL;
-
-	return 0;
-}
-
-static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt,
-			     const struct can_bittiming_const *btc,
-			     const u32 *bitrate_const,
-			     const unsigned int bitrate_const_cnt)
-{
-	int err;
-
-	/*
-	 * Depending on the given can_bittiming parameter structure the CAN
-	 * timing parameters are calculated based on the provided bitrate OR
-	 * alternatively the CAN timing parameters (tq, prop_seg, etc.) are
-	 * provided directly which are then checked and fixed up.
-	 */
-	if (!bt->tq && bt->bitrate && btc)
-		err = can_calc_bittiming(dev, bt, btc);
-	else if (bt->tq && !bt->bitrate && btc)
-		err = can_fixup_bittiming(dev, bt, btc);
-	else if (!bt->tq && bt->bitrate && bitrate_const)
-		err = can_validate_bitrate(dev, bt, bitrate_const,
-					   bitrate_const_cnt);
-	else
-		err = -EINVAL;
-
-	return err;
-}
-
-static void can_update_state_error_stats(struct net_device *dev,
-					 enum can_state new_state)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	if (new_state <= priv->state)
-		return;
-
-	switch (new_state) {
-	case CAN_STATE_ERROR_WARNING:
-		priv->can_stats.error_warning++;
-		break;
-	case CAN_STATE_ERROR_PASSIVE:
-		priv->can_stats.error_passive++;
-		break;
-	case CAN_STATE_BUS_OFF:
-		priv->can_stats.bus_off++;
-		break;
-	default:
-		break;
-	}
-}
-
-static int can_tx_state_to_frame(struct net_device *dev, enum can_state state)
-{
-	switch (state) {
-	case CAN_STATE_ERROR_ACTIVE:
-		return CAN_ERR_CRTL_ACTIVE;
-	case CAN_STATE_ERROR_WARNING:
-		return CAN_ERR_CRTL_TX_WARNING;
-	case CAN_STATE_ERROR_PASSIVE:
-		return CAN_ERR_CRTL_TX_PASSIVE;
-	default:
-		return 0;
-	}
-}
-
-static int can_rx_state_to_frame(struct net_device *dev, enum can_state state)
-{
-	switch (state) {
-	case CAN_STATE_ERROR_ACTIVE:
-		return CAN_ERR_CRTL_ACTIVE;
-	case CAN_STATE_ERROR_WARNING:
-		return CAN_ERR_CRTL_RX_WARNING;
-	case CAN_STATE_ERROR_PASSIVE:
-		return CAN_ERR_CRTL_RX_PASSIVE;
-	default:
-		return 0;
-	}
-}
-
-void can_change_state(struct net_device *dev, struct can_frame *cf,
-		      enum can_state tx_state, enum can_state rx_state)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	enum can_state new_state = max(tx_state, rx_state);
-
-	if (unlikely(new_state == priv->state)) {
-		netdev_warn(dev, "%s: oops, state did not change", __func__);
-		return;
-	}
-
-	netdev_dbg(dev, "New error state: %d\n", new_state);
-
-	can_update_state_error_stats(dev, new_state);
-	priv->state = new_state;
-
-	if (!cf)
-		return;
-
-	if (unlikely(new_state == CAN_STATE_BUS_OFF)) {
-		cf->can_id |= CAN_ERR_BUSOFF;
-		return;
-	}
-
-	cf->can_id |= CAN_ERR_CRTL;
-	cf->data[1] |= tx_state >= rx_state ?
-		       can_tx_state_to_frame(dev, tx_state) : 0;
-	cf->data[1] |= tx_state <= rx_state ?
-		       can_rx_state_to_frame(dev, rx_state) : 0;
-}
-EXPORT_SYMBOL_GPL(can_change_state);
-
-/*
- * Local echo of CAN messages
- *
- * CAN network devices *should* support a local echo functionality
- * (see Documentation/networking/can.rst). To test the handling of CAN
- * interfaces that do not support the local echo both driver types are
- * implemented. In the case that the driver does not support the echo
- * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
- * to perform the echo as a fallback solution.
- */
-static void can_flush_echo_skb(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	struct net_device_stats *stats = &dev->stats;
-	int i;
-
-	for (i = 0; i < priv->echo_skb_max; i++) {
-		if (priv->echo_skb[i]) {
-			kfree_skb(priv->echo_skb[i]);
-			priv->echo_skb[i] = NULL;
-			stats->tx_dropped++;
-			stats->tx_aborted_errors++;
-		}
-	}
-}
-
-/*
- * Put the skb on the stack to be looped backed locally lateron
- *
- * The function is typically called in the start_xmit function
- * of the device driver. The driver must protect access to
- * priv->echo_skb, if necessary.
- */
-void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
-		      unsigned int idx)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	BUG_ON(idx >= priv->echo_skb_max);
-
-	/* check flag whether this packet has to be looped back */
-	if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK ||
-	    (skb->protocol != htons(ETH_P_CAN) &&
-	     skb->protocol != htons(ETH_P_CANFD))) {
-		kfree_skb(skb);
-		return;
-	}
-
-	if (!priv->echo_skb[idx]) {
-
-		skb = can_create_echo_skb(skb);
-		if (!skb)
-			return;
-
-		/* make settings for echo to reduce code in irq context */
-		skb->pkt_type = PACKET_BROADCAST;
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-		skb->dev = dev;
-
-		/* save this skb for tx interrupt echo handling */
-		priv->echo_skb[idx] = skb;
-	} else {
-		/* locking problem with netif_stop_queue() ?? */
-		netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__);
-		kfree_skb(skb);
-	}
-}
-EXPORT_SYMBOL_GPL(can_put_echo_skb);
-
-struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	if (idx >= priv->echo_skb_max) {
-		netdev_err(dev, "%s: BUG! Trying to access can_priv::echo_skb out of bounds (%u/max %u)\n",
-			   __func__, idx, priv->echo_skb_max);
-		return NULL;
-	}
-
-	if (priv->echo_skb[idx]) {
-		/* Using "struct canfd_frame::len" for the frame
-		 * length is supported on both CAN and CANFD frames.
-		 */
-		struct sk_buff *skb = priv->echo_skb[idx];
-		struct canfd_frame *cf = (struct canfd_frame *)skb->data;
-
-		/* get the real payload length for netdev statistics */
-		if (cf->can_id & CAN_RTR_FLAG)
-			*len_ptr = 0;
-		else
-			*len_ptr = cf->len;
-
-		priv->echo_skb[idx] = NULL;
-
-		return skb;
-	}
-
-	return NULL;
-}
-
-/*
- * Get the skb from the stack and loop it back locally
- *
- * The function is typically called when the TX done interrupt
- * is handled in the device driver. The driver must protect
- * access to priv->echo_skb, if necessary.
- */
-unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
-{
-	struct sk_buff *skb;
-	u8 len;
-
-	skb = __can_get_echo_skb(dev, idx, &len);
-	if (!skb)
-		return 0;
-
-	skb_get(skb);
-	if (netif_rx(skb) == NET_RX_SUCCESS)
-		dev_consume_skb_any(skb);
-	else
-		dev_kfree_skb_any(skb);
-
-	return len;
-}
-EXPORT_SYMBOL_GPL(can_get_echo_skb);
-
-/*
-  * Remove the skb from the stack and free it.
-  *
-  * The function is typically called when TX failed.
-  */
-void can_free_echo_skb(struct net_device *dev, unsigned int idx)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	BUG_ON(idx >= priv->echo_skb_max);
-
-	if (priv->echo_skb[idx]) {
-		dev_kfree_skb_any(priv->echo_skb[idx]);
-		priv->echo_skb[idx] = NULL;
-	}
-}
-EXPORT_SYMBOL_GPL(can_free_echo_skb);
-
-/*
- * CAN device restart for bus-off recovery
- */
-static void can_restart(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	struct net_device_stats *stats = &dev->stats;
-	struct sk_buff *skb;
-	struct can_frame *cf;
-	int err;
-
-	BUG_ON(netif_carrier_ok(dev));
-
-	/*
-	 * No synchronization needed because the device is bus-off and
-	 * no messages can come in or go out.
-	 */
-	can_flush_echo_skb(dev);
-
-	/* send restart message upstream */
-	skb = alloc_can_err_skb(dev, &cf);
-	if (skb == NULL) {
-		err = -ENOMEM;
-		goto restart;
-	}
-	cf->can_id |= CAN_ERR_RESTARTED;
-
-	stats->rx_packets++;
-	stats->rx_bytes += cf->can_dlc;
-
-	netif_rx_ni(skb);
-
-restart:
-	netdev_dbg(dev, "restarted\n");
-	priv->can_stats.restarts++;
-
-	/* Now restart the device */
-	err = priv->do_set_mode(dev, CAN_MODE_START);
-
-	netif_carrier_on(dev);
-	if (err)
-		netdev_err(dev, "Error %d during restart", err);
-}
-
-static void can_restart_work(struct work_struct *work)
-{
-	struct delayed_work *dwork = to_delayed_work(work);
-	struct can_priv *priv = container_of(dwork, struct can_priv, restart_work);
-
-	can_restart(priv->dev);
-}
-
-int can_restart_now(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	/*
-	 * A manual restart is only permitted if automatic restart is
-	 * disabled and the device is in the bus-off state
-	 */
-	if (priv->restart_ms)
-		return -EINVAL;
-	if (priv->state != CAN_STATE_BUS_OFF)
-		return -EBUSY;
-
-	cancel_delayed_work_sync(&priv->restart_work);
-	can_restart(dev);
-
-	return 0;
-}
-
-/*
- * CAN bus-off
- *
- * This functions should be called when the device goes bus-off to
- * tell the netif layer that no more packets can be sent or received.
- * If enabled, a timer is started to trigger bus-off recovery.
- */
-void can_bus_off(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	netdev_info(dev, "bus-off\n");
-
-	netif_carrier_off(dev);
-
-	if (priv->restart_ms)
-		schedule_delayed_work(&priv->restart_work,
-				      msecs_to_jiffies(priv->restart_ms));
-}
-EXPORT_SYMBOL_GPL(can_bus_off);
-
-static void can_setup(struct net_device *dev)
-{
-	dev->type = ARPHRD_CAN;
-	dev->mtu = CAN_MTU;
-	dev->hard_header_len = 0;
-	dev->addr_len = 0;
-	dev->tx_queue_len = 10;
-
-	/* New-style flags. */
-	dev->flags = IFF_NOARP;
-	dev->features = NETIF_F_HW_CSUM;
-}
-
-struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
-{
-	struct sk_buff *skb;
-
-	skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) +
-			       sizeof(struct can_frame));
-	if (unlikely(!skb))
-		return NULL;
-
-	skb->protocol = htons(ETH_P_CAN);
-	skb->pkt_type = PACKET_BROADCAST;
-	skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-	skb_reset_mac_header(skb);
-	skb_reset_network_header(skb);
-	skb_reset_transport_header(skb);
-
-	can_skb_reserve(skb);
-	can_skb_prv(skb)->ifindex = dev->ifindex;
-	can_skb_prv(skb)->skbcnt = 0;
-
-	*cf = skb_put_zero(skb, sizeof(struct can_frame));
-
-	return skb;
-}
-EXPORT_SYMBOL_GPL(alloc_can_skb);
-
-struct sk_buff *alloc_canfd_skb(struct net_device *dev,
-				struct canfd_frame **cfd)
-{
-	struct sk_buff *skb;
-
-	skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) +
-			       sizeof(struct canfd_frame));
-	if (unlikely(!skb))
-		return NULL;
-
-	skb->protocol = htons(ETH_P_CANFD);
-	skb->pkt_type = PACKET_BROADCAST;
-	skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-	skb_reset_mac_header(skb);
-	skb_reset_network_header(skb);
-	skb_reset_transport_header(skb);
-
-	can_skb_reserve(skb);
-	can_skb_prv(skb)->ifindex = dev->ifindex;
-	can_skb_prv(skb)->skbcnt = 0;
-
-	*cfd = skb_put_zero(skb, sizeof(struct canfd_frame));
-
-	return skb;
-}
-EXPORT_SYMBOL_GPL(alloc_canfd_skb);
-
-struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
-{
-	struct sk_buff *skb;
-
-	skb = alloc_can_skb(dev, cf);
-	if (unlikely(!skb))
-		return NULL;
-
-	(*cf)->can_id = CAN_ERR_FLAG;
-	(*cf)->can_dlc = CAN_ERR_DLC;
-
-	return skb;
-}
-EXPORT_SYMBOL_GPL(alloc_can_err_skb);
-
-/*
- * Allocate and setup space for the CAN network device
- */
-struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
-				    unsigned int txqs, unsigned int rxqs)
-{
-	struct net_device *dev;
-	struct can_priv *priv;
-	int size;
-
-	if (echo_skb_max)
-		size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) +
-			echo_skb_max * sizeof(struct sk_buff *);
-	else
-		size = sizeof_priv;
-
-	dev = alloc_netdev_mqs(size, "can%d", NET_NAME_UNKNOWN, can_setup,
-			       txqs, rxqs);
-	if (!dev)
-		return NULL;
-
-	priv = netdev_priv(dev);
-	priv->dev = dev;
-
-	if (echo_skb_max) {
-		priv->echo_skb_max = echo_skb_max;
-		priv->echo_skb = (void *)priv +
-			ALIGN(sizeof_priv, sizeof(struct sk_buff *));
-	}
-
-	priv->state = CAN_STATE_STOPPED;
-
-	INIT_DELAYED_WORK(&priv->restart_work, can_restart_work);
-
-	return dev;
-}
-EXPORT_SYMBOL_GPL(alloc_candev_mqs);
-
-/*
- * Free space of the CAN network device
- */
-void free_candev(struct net_device *dev)
-{
-	free_netdev(dev);
-}
-EXPORT_SYMBOL_GPL(free_candev);
-
-/*
- * changing MTU and control mode for CAN/CANFD devices
- */
-int can_change_mtu(struct net_device *dev, int new_mtu)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	/* Do not allow changing the MTU while running */
-	if (dev->flags & IFF_UP)
-		return -EBUSY;
-
-	/* allow change of MTU according to the CANFD ability of the device */
-	switch (new_mtu) {
-	case CAN_MTU:
-		/* 'CANFD-only' controllers can not switch to CAN_MTU */
-		if (priv->ctrlmode_static & CAN_CTRLMODE_FD)
-			return -EINVAL;
-
-		priv->ctrlmode &= ~CAN_CTRLMODE_FD;
-		break;
-
-	case CANFD_MTU:
-		/* check for potential CANFD ability */
-		if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) &&
-		    !(priv->ctrlmode_static & CAN_CTRLMODE_FD))
-			return -EINVAL;
-
-		priv->ctrlmode |= CAN_CTRLMODE_FD;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(can_change_mtu);
-
-/*
- * Common open function when the device gets opened.
- *
- * This function should be called in the open function of the device
- * driver.
- */
-int open_candev(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	if (!priv->bittiming.bitrate) {
-		netdev_err(dev, "bit-timing not yet defined\n");
-		return -EINVAL;
-	}
-
-	/* For CAN FD the data bitrate has to be >= the arbitration bitrate */
-	if ((priv->ctrlmode & CAN_CTRLMODE_FD) &&
-	    (!priv->data_bittiming.bitrate ||
-	     (priv->data_bittiming.bitrate < priv->bittiming.bitrate))) {
-		netdev_err(dev, "incorrect/missing data bit-timing\n");
-		return -EINVAL;
-	}
-
-	/* Switch carrier on if device was stopped while in bus-off state */
-	if (!netif_carrier_ok(dev))
-		netif_carrier_on(dev);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(open_candev);
-
-#ifdef CONFIG_OF
-/* Common function that can be used to understand the limitation of
- * a transceiver when it provides no means to determine these limitations
- * at runtime.
- */
-void of_can_transceiver(struct net_device *dev)
-{
-	struct device_node *dn;
-	struct can_priv *priv = netdev_priv(dev);
-	struct device_node *np = dev->dev.parent->of_node;
-	int ret;
-
-	dn = of_get_child_by_name(np, "can-transceiver");
-	if (!dn)
-		return;
-
-	ret = of_property_read_u32(dn, "max-bitrate", &priv->bitrate_max);
-	of_node_put(dn);
-	if ((ret && ret != -EINVAL) || (!ret && !priv->bitrate_max))
-		netdev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit.\n");
-}
-EXPORT_SYMBOL_GPL(of_can_transceiver);
-#endif
-
-/*
- * Common close function for cleanup before the device gets closed.
- *
- * This function should be called in the close function of the device
- * driver.
- */
-void close_candev(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	cancel_delayed_work_sync(&priv->restart_work);
-	can_flush_echo_skb(dev);
-}
-EXPORT_SYMBOL_GPL(close_candev);
-
-/*
- * CAN netlink interface
- */
-static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
-	[IFLA_CAN_STATE]	= { .type = NLA_U32 },
-	[IFLA_CAN_CTRLMODE]	= { .len = sizeof(struct can_ctrlmode) },
-	[IFLA_CAN_RESTART_MS]	= { .type = NLA_U32 },
-	[IFLA_CAN_RESTART]	= { .type = NLA_U32 },
-	[IFLA_CAN_BITTIMING]	= { .len = sizeof(struct can_bittiming) },
-	[IFLA_CAN_BITTIMING_CONST]
-				= { .len = sizeof(struct can_bittiming_const) },
-	[IFLA_CAN_CLOCK]	= { .len = sizeof(struct can_clock) },
-	[IFLA_CAN_BERR_COUNTER]	= { .len = sizeof(struct can_berr_counter) },
-	[IFLA_CAN_DATA_BITTIMING]
-				= { .len = sizeof(struct can_bittiming) },
-	[IFLA_CAN_DATA_BITTIMING_CONST]
-				= { .len = sizeof(struct can_bittiming_const) },
-	[IFLA_CAN_TERMINATION]	= { .type = NLA_U16 },
-};
-
-static int can_validate(struct nlattr *tb[], struct nlattr *data[],
-			struct netlink_ext_ack *extack)
-{
-	bool is_can_fd = false;
-
-	/* Make sure that valid CAN FD configurations always consist of
-	 * - nominal/arbitration bittiming
-	 * - data bittiming
-	 * - control mode with CAN_CTRLMODE_FD set
-	 */
-
-	if (!data)
-		return 0;
-
-	if (data[IFLA_CAN_CTRLMODE]) {
-		struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
-
-		is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD;
-	}
-
-	if (is_can_fd) {
-		if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING])
-			return -EOPNOTSUPP;
-	}
-
-	if (data[IFLA_CAN_DATA_BITTIMING]) {
-		if (!is_can_fd || !data[IFLA_CAN_BITTIMING])
-			return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
-static int can_changelink(struct net_device *dev, struct nlattr *tb[],
-			  struct nlattr *data[],
-			  struct netlink_ext_ack *extack)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	int err;
-
-	/* We need synchronization with dev->stop() */
-	ASSERT_RTNL();
-
-	if (data[IFLA_CAN_BITTIMING]) {
-		struct can_bittiming bt;
-
-		/* Do not allow changing bittiming while running */
-		if (dev->flags & IFF_UP)
-			return -EBUSY;
-
-		/* Calculate bittiming parameters based on
-		 * bittiming_const if set, otherwise pass bitrate
-		 * directly via do_set_bitrate(). Bail out if neither
-		 * is given.
-		 */
-		if (!priv->bittiming_const && !priv->do_set_bittiming)
-			return -EOPNOTSUPP;
-
-		memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
-		err = can_get_bittiming(dev, &bt,
-					priv->bittiming_const,
-					priv->bitrate_const,
-					priv->bitrate_const_cnt);
-		if (err)
-			return err;
-
-		if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
-			netdev_err(dev, "arbitration bitrate surpasses transceiver capabilities of %d bps\n",
-				   priv->bitrate_max);
-			return -EINVAL;
-		}
-
-		memcpy(&priv->bittiming, &bt, sizeof(bt));
-
-		if (priv->do_set_bittiming) {
-			/* Finally, set the bit-timing registers */
-			err = priv->do_set_bittiming(dev);
-			if (err)
-				return err;
-		}
-	}
-
-	if (data[IFLA_CAN_CTRLMODE]) {
-		struct can_ctrlmode *cm;
-		u32 ctrlstatic;
-		u32 maskedflags;
-
-		/* Do not allow changing controller mode while running */
-		if (dev->flags & IFF_UP)
-			return -EBUSY;
-		cm = nla_data(data[IFLA_CAN_CTRLMODE]);
-		ctrlstatic = priv->ctrlmode_static;
-		maskedflags = cm->flags & cm->mask;
-
-		/* check whether provided bits are allowed to be passed */
-		if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic))
-			return -EOPNOTSUPP;
-
-		/* do not check for static fd-non-iso if 'fd' is disabled */
-		if (!(maskedflags & CAN_CTRLMODE_FD))
-			ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
-
-		/* make sure static options are provided by configuration */
-		if ((maskedflags & ctrlstatic) != ctrlstatic)
-			return -EOPNOTSUPP;
-
-		/* clear bits to be modified and copy the flag values */
-		priv->ctrlmode &= ~cm->mask;
-		priv->ctrlmode |= maskedflags;
-
-		/* CAN_CTRLMODE_FD can only be set when driver supports FD */
-		if (priv->ctrlmode & CAN_CTRLMODE_FD)
-			dev->mtu = CANFD_MTU;
-		else
-			dev->mtu = CAN_MTU;
-	}
-
-	if (data[IFLA_CAN_RESTART_MS]) {
-		/* Do not allow changing restart delay while running */
-		if (dev->flags & IFF_UP)
-			return -EBUSY;
-		priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
-	}
-
-	if (data[IFLA_CAN_RESTART]) {
-		/* Do not allow a restart while not running */
-		if (!(dev->flags & IFF_UP))
-			return -EINVAL;
-		err = can_restart_now(dev);
-		if (err)
-			return err;
-	}
-
-	if (data[IFLA_CAN_DATA_BITTIMING]) {
-		struct can_bittiming dbt;
-
-		/* Do not allow changing bittiming while running */
-		if (dev->flags & IFF_UP)
-			return -EBUSY;
-
-		/* Calculate bittiming parameters based on
-		 * data_bittiming_const if set, otherwise pass bitrate
-		 * directly via do_set_bitrate(). Bail out if neither
-		 * is given.
-		 */
-		if (!priv->data_bittiming_const && !priv->do_set_data_bittiming)
-			return -EOPNOTSUPP;
-
-		memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
-		       sizeof(dbt));
-		err = can_get_bittiming(dev, &dbt,
-					priv->data_bittiming_const,
-					priv->data_bitrate_const,
-					priv->data_bitrate_const_cnt);
-		if (err)
-			return err;
-
-		if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
-			netdev_err(dev, "canfd data bitrate surpasses transceiver capabilities of %d bps\n",
-				   priv->bitrate_max);
-			return -EINVAL;
-		}
-
-		memcpy(&priv->data_bittiming, &dbt, sizeof(dbt));
-
-		if (priv->do_set_data_bittiming) {
-			/* Finally, set the bit-timing registers */
-			err = priv->do_set_data_bittiming(dev);
-			if (err)
-				return err;
-		}
-	}
-
-	if (data[IFLA_CAN_TERMINATION]) {
-		const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
-		const unsigned int num_term = priv->termination_const_cnt;
-		unsigned int i;
-
-		if (!priv->do_set_termination)
-			return -EOPNOTSUPP;
-
-		/* check whether given value is supported by the interface */
-		for (i = 0; i < num_term; i++) {
-			if (termval == priv->termination_const[i])
-				break;
-		}
-		if (i >= num_term)
-			return -EINVAL;
-
-		/* Finally, set the termination value */
-		err = priv->do_set_termination(dev, termval);
-		if (err)
-			return err;
-
-		priv->termination = termval;
-	}
-
-	return 0;
-}
-
-static size_t can_get_size(const struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	size_t size = 0;
-
-	if (priv->bittiming.bitrate)				/* IFLA_CAN_BITTIMING */
-		size += nla_total_size(sizeof(struct can_bittiming));
-	if (priv->bittiming_const)				/* IFLA_CAN_BITTIMING_CONST */
-		size += nla_total_size(sizeof(struct can_bittiming_const));
-	size += nla_total_size(sizeof(struct can_clock));	/* IFLA_CAN_CLOCK */
-	size += nla_total_size(sizeof(u32));			/* IFLA_CAN_STATE */
-	size += nla_total_size(sizeof(struct can_ctrlmode));	/* IFLA_CAN_CTRLMODE */
-	size += nla_total_size(sizeof(u32));			/* IFLA_CAN_RESTART_MS */
-	if (priv->do_get_berr_counter)				/* IFLA_CAN_BERR_COUNTER */
-		size += nla_total_size(sizeof(struct can_berr_counter));
-	if (priv->data_bittiming.bitrate)			/* IFLA_CAN_DATA_BITTIMING */
-		size += nla_total_size(sizeof(struct can_bittiming));
-	if (priv->data_bittiming_const)				/* IFLA_CAN_DATA_BITTIMING_CONST */
-		size += nla_total_size(sizeof(struct can_bittiming_const));
-	if (priv->termination_const) {
-		size += nla_total_size(sizeof(priv->termination));		/* IFLA_CAN_TERMINATION */
-		size += nla_total_size(sizeof(*priv->termination_const) *	/* IFLA_CAN_TERMINATION_CONST */
-				       priv->termination_const_cnt);
-	}
-	if (priv->bitrate_const)				/* IFLA_CAN_BITRATE_CONST */
-		size += nla_total_size(sizeof(*priv->bitrate_const) *
-				       priv->bitrate_const_cnt);
-	if (priv->data_bitrate_const)				/* IFLA_CAN_DATA_BITRATE_CONST */
-		size += nla_total_size(sizeof(*priv->data_bitrate_const) *
-				       priv->data_bitrate_const_cnt);
-	size += sizeof(priv->bitrate_max);			/* IFLA_CAN_BITRATE_MAX */
-
-	return size;
-}
-
-static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	struct can_ctrlmode cm = {.flags = priv->ctrlmode};
-	struct can_berr_counter bec = { };
-	enum can_state state = priv->state;
-
-	if (priv->do_get_state)
-		priv->do_get_state(dev, &state);
-
-	if ((priv->bittiming.bitrate &&
-	     nla_put(skb, IFLA_CAN_BITTIMING,
-		     sizeof(priv->bittiming), &priv->bittiming)) ||
-
-	    (priv->bittiming_const &&
-	     nla_put(skb, IFLA_CAN_BITTIMING_CONST,
-		     sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
-
-	    nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
-	    nla_put_u32(skb, IFLA_CAN_STATE, state) ||
-	    nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
-	    nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
-
-	    (priv->do_get_berr_counter &&
-	     !priv->do_get_berr_counter(dev, &bec) &&
-	     nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
-
-	    (priv->data_bittiming.bitrate &&
-	     nla_put(skb, IFLA_CAN_DATA_BITTIMING,
-		     sizeof(priv->data_bittiming), &priv->data_bittiming)) ||
-
-	    (priv->data_bittiming_const &&
-	     nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST,
-		     sizeof(*priv->data_bittiming_const),
-		     priv->data_bittiming_const)) ||
-
-	    (priv->termination_const &&
-	     (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
-	      nla_put(skb, IFLA_CAN_TERMINATION_CONST,
-		      sizeof(*priv->termination_const) *
-		      priv->termination_const_cnt,
-		      priv->termination_const))) ||
-
-	    (priv->bitrate_const &&
-	     nla_put(skb, IFLA_CAN_BITRATE_CONST,
-		     sizeof(*priv->bitrate_const) *
-		     priv->bitrate_const_cnt,
-		     priv->bitrate_const)) ||
-
-	    (priv->data_bitrate_const &&
-	     nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST,
-		     sizeof(*priv->data_bitrate_const) *
-		     priv->data_bitrate_const_cnt,
-		     priv->data_bitrate_const)) ||
-
-	    (nla_put(skb, IFLA_CAN_BITRATE_MAX,
-		     sizeof(priv->bitrate_max),
-		     &priv->bitrate_max))
-	    )
-
-		return -EMSGSIZE;
-
-	return 0;
-}
-
-static size_t can_get_xstats_size(const struct net_device *dev)
-{
-	return sizeof(struct can_device_stats);
-}
-
-static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	if (nla_put(skb, IFLA_INFO_XSTATS,
-		    sizeof(priv->can_stats), &priv->can_stats))
-		goto nla_put_failure;
-	return 0;
-
-nla_put_failure:
-	return -EMSGSIZE;
-}
-
-static int can_newlink(struct net *src_net, struct net_device *dev,
-		       struct nlattr *tb[], struct nlattr *data[],
-		       struct netlink_ext_ack *extack)
-{
-	return -EOPNOTSUPP;
-}
-
-static void can_dellink(struct net_device *dev, struct list_head *head)
-{
-	return;
-}
-
-static struct rtnl_link_ops can_link_ops __read_mostly = {
-	.kind		= "can",
-	.netns_refund	= true,
-	.maxtype	= IFLA_CAN_MAX,
-	.policy		= can_policy,
-	.setup		= can_setup,
-	.validate	= can_validate,
-	.newlink	= can_newlink,
-	.changelink	= can_changelink,
-	.dellink	= can_dellink,
-	.get_size	= can_get_size,
-	.fill_info	= can_fill_info,
-	.get_xstats_size = can_get_xstats_size,
-	.fill_xstats	= can_fill_xstats,
-};
-
-/*
- * Register the CAN network device
- */
-int register_candev(struct net_device *dev)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	/* Ensure termination_const, termination_const_cnt and
-	 * do_set_termination consistency. All must be either set or
-	 * unset.
-	 */
-	if ((!priv->termination_const != !priv->termination_const_cnt) ||
-	    (!priv->termination_const != !priv->do_set_termination))
-		return -EINVAL;
-
-	if (!priv->bitrate_const != !priv->bitrate_const_cnt)
-		return -EINVAL;
-
-	if (!priv->data_bitrate_const != !priv->data_bitrate_const_cnt)
-		return -EINVAL;
-
-	dev->rtnl_link_ops = &can_link_ops;
-	netif_carrier_off(dev);
-
-	return register_netdev(dev);
-}
-EXPORT_SYMBOL_GPL(register_candev);
-
-/*
- * Unregister the CAN network device
- */
-void unregister_candev(struct net_device *dev)
-{
-	unregister_netdev(dev);
-}
-EXPORT_SYMBOL_GPL(unregister_candev);
-
-/*
- * Test if a network device is a candev based device
- * and return the can_priv* if so.
- */
-struct can_priv *safe_candev_priv(struct net_device *dev)
-{
-	if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops))
-		return NULL;
-
-	return netdev_priv(dev);
-}
-EXPORT_SYMBOL_GPL(safe_candev_priv);
-
-static __init int can_dev_init(void)
-{
-	int err;
-
-	can_led_notifier_init();
-
-	err = rtnl_link_register(&can_link_ops);
-	if (!err)
-		printk(KERN_INFO MOD_DESC "\n");
-
-	return err;
-}
-module_init(can_dev_init);
-
-static __exit void can_dev_exit(void)
-{
-	rtnl_link_unregister(&can_link_ops);
-
-	can_led_notifier_exit();
-}
-module_exit(can_dev_exit);
-
-MODULE_ALIAS_RTNL_LINK("can");