diff options
Diffstat (limited to 'drivers/net/can/dev.c')
| -rw-r--r-- | drivers/net/can/dev.c | 839 |
1 files changed, 0 insertions, 839 deletions
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c deleted file mode 100644 index f9cba4123c66..000000000000 --- a/drivers/net/can/dev.c +++ /dev/null @@ -1,839 +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, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/netdevice.h> -#include <linux/if_arp.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 <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 */ - -/* - * 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_spt(const struct can_bittiming_const *btc, - int sampl_pt, int tseg, int *tseg1, int *tseg2) -{ - *tseg2 = tseg + 1 - (sampl_pt * (tseg + 1)) / 1000; - if (*tseg2 < btc->tseg2_min) - *tseg2 = btc->tseg2_min; - if (*tseg2 > btc->tseg2_max) - *tseg2 = btc->tseg2_max; - *tseg1 = tseg - *tseg2; - if (*tseg1 > btc->tseg1_max) { - *tseg1 = btc->tseg1_max; - *tseg2 = tseg - *tseg1; - } - return 1000 * (tseg + 1 - *tseg2) / (tseg + 1); -} - -static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt) -{ - struct can_priv *priv = netdev_priv(dev); - const struct can_bittiming_const *btc = priv->bittiming_const; - long rate, best_rate = 0; - long best_error = 1000000000, error = 0; - int best_tseg = 0, best_brp = 0, brp = 0; - int tsegall, tseg = 0, tseg1 = 0, tseg2 = 0; - int spt_error = 1000, spt = 0, sampl_pt; - u64 v64; - - if (!priv->bittiming_const) - return -ENOTSUPP; - - /* Use CIA recommended sample points */ - if (bt->sample_point) { - sampl_pt = bt->sample_point; - } else { - if (bt->bitrate > 800000) - sampl_pt = 750; - else if (bt->bitrate > 500000) - sampl_pt = 800; - else - sampl_pt = 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 = 1 + tseg / 2; - /* Compute all possible tseg choices (tseg=tseg1+tseg2) */ - brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2; - /* chose 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; - rate = priv->clock.freq / (brp * tsegall); - error = bt->bitrate - rate; - /* tseg brp biterror */ - if (error < 0) - error = -error; - if (error > best_error) - continue; - best_error = error; - if (error == 0) { - spt = can_update_spt(btc, sampl_pt, tseg / 2, - &tseg1, &tseg2); - error = sampl_pt - spt; - if (error < 0) - error = -error; - if (error > spt_error) - continue; - spt_error = error; - } - best_tseg = tseg / 2; - best_brp = brp; - best_rate = rate; - if (error == 0) - break; - } - - if (best_error) { - /* Error in one-tenth of a percent */ - error = (best_error * 1000) / bt->bitrate; - if (error > CAN_CALC_MAX_ERROR) { - netdev_err(dev, - "bitrate error %ld.%ld%% too high\n", - error / 10, error % 10); - return -EDOM; - } else { - netdev_warn(dev, "bitrate error %ld.%ld%%\n", - error / 10, error % 10); - } - } - - /* real sample point */ - bt->sample_point = can_update_spt(btc, sampl_pt, best_tseg, - &tseg1, &tseg2); - - v64 = (u64)best_brp * 1000000000UL; - 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 bit-rate */ - bt->bitrate = priv->clock.freq / (bt->brp * (tseg1 + tseg2 + 1)); - - return 0; -} -#else /* !CONFIG_CAN_CALC_BITTIMING */ -static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt) -{ - 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) -{ - struct can_priv *priv = netdev_priv(dev); - const struct can_bittiming_const *btc = priv->bittiming_const; - int tseg1, alltseg; - u64 brp64; - - if (!priv->bittiming_const) - return -ENOTSUPP; - - 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; -} - -static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt) -{ - struct can_priv *priv = netdev_priv(dev); - int err; - - /* Check if the CAN device has bit-timing parameters */ - if (priv->bittiming_const) { - - /* Non-expert mode? Check if the bitrate has been pre-defined */ - if (!bt->tq) - /* Determine bit-timing parameters */ - err = can_calc_bittiming(dev, bt); - else - /* Check bit-timing params and calculate proper brp */ - err = can_fixup_bittiming(dev, bt); - if (err) - return err; - } - - return 0; -} - -/* - * Local echo of CAN messages - * - * CAN network devices *should* support a local echo functionality - * (see Documentation/networking/can.txt). 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) { - kfree_skb(skb); - return; - } - - if (!priv->echo_skb[idx]) { - struct sock *srcsk = skb->sk; - - if (atomic_read(&skb->users) != 1) { - struct sk_buff *old_skb = skb; - - skb = skb_clone(old_skb, GFP_ATOMIC); - kfree_skb(old_skb); - if (!skb) - return; - } else - skb_orphan(skb); - - skb->sk = srcsk; - - /* make settings for echo to reduce code in irq context */ - skb->protocol = htons(ETH_P_CAN); - 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); - -/* - * 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 can_priv *priv = netdev_priv(dev); - - BUG_ON(idx >= priv->echo_skb_max); - - if (priv->echo_skb[idx]) { - struct sk_buff *skb = priv->echo_skb[idx]; - struct can_frame *cf = (struct can_frame *)skb->data; - u8 dlc = cf->can_dlc; - - netif_rx(priv->echo_skb[idx]); - priv->echo_skb[idx] = NULL; - - return dlc; - } - - return 0; -} -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]) { - kfree_skb(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(unsigned long data) -{ - struct net_device *dev = (struct net_device *)data; - 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; - - netif_rx(skb); - - stats->rx_packets++; - stats->rx_bytes += cf->can_dlc; - -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); -} - -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; - - /* Runs as soon as possible in the timer context */ - mod_timer(&priv->restart_timer, jiffies); - - 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_dbg(dev, "bus-off\n"); - - netif_carrier_off(dev); - priv->can_stats.bus_off++; - - if (priv->restart_ms) - mod_timer(&priv->restart_timer, - jiffies + (priv->restart_ms * HZ) / 1000); -} -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; - - can_skb_reserve(skb); - can_skb_prv(skb)->ifindex = dev->ifindex; - - *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); - memset(*cf, 0, sizeof(struct can_frame)); - - return skb; -} -EXPORT_SYMBOL_GPL(alloc_can_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(int sizeof_priv, unsigned int echo_skb_max) -{ - 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(size, "can%d", can_setup); - if (!dev) - return NULL; - - priv = netdev_priv(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_timer(&priv->restart_timer); - - return dev; -} -EXPORT_SYMBOL_GPL(alloc_candev); - -/* - * Free space of the CAN network device - */ -void free_candev(struct net_device *dev) -{ - free_netdev(dev); -} -EXPORT_SYMBOL_GPL(free_candev); - -/* - * 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.tq && !priv->bittiming.bitrate) { - netdev_err(dev, "bit-timing not yet defined\n"); - return -EINVAL; - } - - /* Switch carrier on if device was stopped while in bus-off state */ - if (!netif_carrier_ok(dev)) - netif_carrier_on(dev); - - setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev); - - return 0; -} -EXPORT_SYMBOL_GPL(open_candev); - -/* - * 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); - - del_timer_sync(&priv->restart_timer); - 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) }, -}; - -static int can_changelink(struct net_device *dev, - struct nlattr *tb[], struct nlattr *data[]) -{ - struct can_priv *priv = netdev_priv(dev); - int err; - - /* We need synchronization with dev->stop() */ - ASSERT_RTNL(); - - if (data[IFLA_CAN_CTRLMODE]) { - struct can_ctrlmode *cm; - - /* Do not allow changing controller mode while running */ - if (dev->flags & IFF_UP) - return -EBUSY; - cm = nla_data(data[IFLA_CAN_CTRLMODE]); - if (cm->flags & ~priv->ctrlmode_supported) - return -EOPNOTSUPP; - priv->ctrlmode &= ~cm->mask; - priv->ctrlmode |= cm->flags; - } - - if (data[IFLA_CAN_BITTIMING]) { - struct can_bittiming bt; - - /* Do not allow changing bittiming while running */ - if (dev->flags & IFF_UP) - return -EBUSY; - memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); - if ((!bt.bitrate && !bt.tq) || (bt.bitrate && bt.tq)) - return -EINVAL; - err = can_get_bittiming(dev, &bt); - if (err) - return err; - 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_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; - } - - return 0; -} - -static size_t can_get_size(const struct net_device *dev) -{ - struct can_priv *priv = netdev_priv(dev); - size_t size; - - size = nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ - size += sizeof(struct can_ctrlmode); /* IFLA_CAN_CTRLMODE */ - size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ - size += sizeof(struct can_bittiming); /* IFLA_CAN_BITTIMING */ - size += sizeof(struct can_clock); /* IFLA_CAN_CLOCK */ - if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ - size += sizeof(struct can_berr_counter); - if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ - size += sizeof(struct can_bittiming_const); - - 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 (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) || - nla_put(skb, IFLA_CAN_BITTIMING, - sizeof(priv->bittiming), &priv->bittiming) || - nla_put(skb, IFLA_CAN_CLOCK, sizeof(cm), &priv->clock) || - (priv->do_get_berr_counter && - !priv->do_get_berr_counter(dev, &bec) && - nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) || - (priv->bittiming_const && - nla_put(skb, IFLA_CAN_BITTIMING_CONST, - sizeof(*priv->bittiming_const), priv->bittiming_const))) - goto nla_put_failure; - return 0; - -nla_put_failure: - return -EMSGSIZE; -} - -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[]) -{ - return -EOPNOTSUPP; -} - -static struct rtnl_link_ops can_link_ops __read_mostly = { - .kind = "can", - .maxtype = IFLA_CAN_MAX, - .policy = can_policy, - .setup = can_setup, - .newlink = can_newlink, - .changelink = can_changelink, - .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) -{ - dev->rtnl_link_ops = &can_link_ops; - 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"); |