summaryrefslogtreecommitdiff
path: root/drivers/net/can/dev
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/can/dev')
-rw-r--r--drivers/net/can/dev/Makefile17
-rw-r--r--drivers/net/can/dev/bittiming.c197
-rw-r--r--drivers/net/can/dev/calc_bittiming.c202
-rw-r--r--drivers/net/can/dev/dev.c59
-rw-r--r--drivers/net/can/dev/netlink.c9
-rw-r--r--drivers/net/can/dev/skb.c78
6 files changed, 347 insertions, 215 deletions
diff --git a/drivers/net/can/dev/Makefile b/drivers/net/can/dev/Makefile
index af2901db473c..633687d6b6c0 100644
--- a/drivers/net/can/dev/Makefile
+++ b/drivers/net/can/dev/Makefile
@@ -1,9 +1,12 @@
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_CAN_DEV) += can-dev.o
-can-dev-y += bittiming.o
-can-dev-y += dev.o
-can-dev-y += length.o
-can-dev-y += netlink.o
-can-dev-y += rx-offload.o
-can-dev-y += skb.o
+obj-$(CONFIG_CAN_DEV) += can-dev.o
+
+can-dev-y += skb.o
+
+can-dev-$(CONFIG_CAN_CALC_BITTIMING) += calc_bittiming.o
+can-dev-$(CONFIG_CAN_NETLINK) += bittiming.o
+can-dev-$(CONFIG_CAN_NETLINK) += dev.o
+can-dev-$(CONFIG_CAN_NETLINK) += length.o
+can-dev-$(CONFIG_CAN_NETLINK) += netlink.o
+can-dev-$(CONFIG_CAN_RX_OFFLOAD) += rx-offload.o
diff --git a/drivers/net/can/dev/bittiming.c b/drivers/net/can/dev/bittiming.c
index c1e76f0a5064..7ae80763c960 100644
--- a/drivers/net/can/dev/bittiming.c
+++ b/drivers/net/can/dev/bittiming.c
@@ -4,205 +4,8 @@
* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
*/
-#include <linux/units.h>
#include <linux/can/dev.h>
-#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_sample_point(const struct can_bittiming_const *btc,
- const unsigned int sample_point_nominal, const 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_SYNC_SEG -
- (sample_point_nominal * (tseg + CAN_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_SYNC_SEG - tseg2) /
- (tseg + CAN_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;
-}
-
-int can_calc_bittiming(const 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 > 800 * KILO /* BPS */)
- sample_point_nominal = 750;
- else if (bt->bitrate > 500 * KILO /* BPS */)
- 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_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_SYNC_SEG + tseg1 + tseg2));
-
- return 0;
-}
-
-void can_calc_tdco(struct can_tdc *tdc, const struct can_tdc_const *tdc_const,
- const struct can_bittiming *dbt,
- u32 *ctrlmode, u32 ctrlmode_supported)
-
-{
- if (!tdc_const || !(ctrlmode_supported & CAN_CTRLMODE_TDC_AUTO))
- return;
-
- *ctrlmode &= ~CAN_CTRLMODE_TDC_MASK;
-
- /* As specified in ISO 11898-1 section 11.3.3 "Transmitter
- * delay compensation" (TDC) is only applicable if data BRP is
- * one or two.
- */
- if (dbt->brp == 1 || dbt->brp == 2) {
- /* Sample point in clock periods */
- u32 sample_point_in_tc = (CAN_SYNC_SEG + dbt->prop_seg +
- dbt->phase_seg1) * dbt->brp;
-
- if (sample_point_in_tc < tdc_const->tdco_min)
- return;
- tdc->tdco = min(sample_point_in_tc, tdc_const->tdco_max);
- *ctrlmode |= CAN_CTRLMODE_TDC_AUTO;
- }
-}
-#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
diff --git a/drivers/net/can/dev/calc_bittiming.c b/drivers/net/can/dev/calc_bittiming.c
new file mode 100644
index 000000000000..d3caa040614d
--- /dev/null
+++ b/drivers/net/can/dev/calc_bittiming.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
+ * Copyright (C) 2006 Andrey Volkov, Varma Electronics
+ * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
+ */
+
+#include <linux/units.h>
+#include <linux/can/dev.h>
+
+#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_sample_point(const struct can_bittiming_const *btc,
+ const unsigned int sample_point_nominal, const 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_SYNC_SEG -
+ (sample_point_nominal * (tseg + CAN_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_SYNC_SEG - tseg2) /
+ (tseg + CAN_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;
+}
+
+int can_calc_bittiming(const 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 > 800 * KILO /* BPS */)
+ sample_point_nominal = 750;
+ else if (bt->bitrate > 500 * KILO /* BPS */)
+ 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_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_SYNC_SEG + tseg1 + tseg2));
+
+ return 0;
+}
+
+void can_calc_tdco(struct can_tdc *tdc, const struct can_tdc_const *tdc_const,
+ const struct can_bittiming *dbt,
+ u32 *ctrlmode, u32 ctrlmode_supported)
+
+{
+ if (!tdc_const || !(ctrlmode_supported & CAN_CTRLMODE_TDC_AUTO))
+ return;
+
+ *ctrlmode &= ~CAN_CTRLMODE_TDC_MASK;
+
+ /* As specified in ISO 11898-1 section 11.3.3 "Transmitter
+ * delay compensation" (TDC) is only applicable if data BRP is
+ * one or two.
+ */
+ if (dbt->brp == 1 || dbt->brp == 2) {
+ /* Sample point in clock periods */
+ u32 sample_point_in_tc = (CAN_SYNC_SEG + dbt->prop_seg +
+ dbt->phase_seg1) * dbt->brp;
+
+ if (sample_point_in_tc < tdc_const->tdco_min)
+ return;
+ tdc->tdco = min(sample_point_in_tc, tdc_const->tdco_max);
+ *ctrlmode |= CAN_CTRLMODE_TDC_AUTO;
+ }
+}
diff --git a/drivers/net/can/dev/dev.c b/drivers/net/can/dev/dev.c
index 96c9d9db00cf..c1956b1e9faf 100644
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@@ -4,7 +4,6 @@
* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
*/
-#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
@@ -17,12 +16,6 @@
#include <linux/gpio/consumer.h>
#include <linux/of.h>
-#define MOD_DESC "CAN device driver interface"
-
-MODULE_DESCRIPTION(MOD_DESC);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
-
static void can_update_state_error_stats(struct net_device *dev,
enum can_state new_state)
{
@@ -329,6 +322,56 @@ int can_change_mtu(struct net_device *dev, int new_mtu)
}
EXPORT_SYMBOL_GPL(can_change_mtu);
+/* generic implementation of netdev_ops::ndo_eth_ioctl for CAN devices
+ * supporting hardware timestamps
+ */
+int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+ struct hwtstamp_config hwts_cfg = { 0 };
+
+ switch (cmd) {
+ case SIOCSHWTSTAMP: /* set */
+ if (copy_from_user(&hwts_cfg, ifr->ifr_data, sizeof(hwts_cfg)))
+ return -EFAULT;
+ if (hwts_cfg.tx_type == HWTSTAMP_TX_ON &&
+ hwts_cfg.rx_filter == HWTSTAMP_FILTER_ALL)
+ return 0;
+ return -ERANGE;
+
+ case SIOCGHWTSTAMP: /* get */
+ hwts_cfg.tx_type = HWTSTAMP_TX_ON;
+ hwts_cfg.rx_filter = HWTSTAMP_FILTER_ALL;
+ if (copy_to_user(ifr->ifr_data, &hwts_cfg, sizeof(hwts_cfg)))
+ return -EFAULT;
+ return 0;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+EXPORT_SYMBOL(can_eth_ioctl_hwts);
+
+/* generic implementation of ethtool_ops::get_ts_info for CAN devices
+ * supporting hardware timestamps
+ */
+int can_ethtool_op_get_ts_info_hwts(struct net_device *dev,
+ struct ethtool_ts_info *info)
+{
+ info->so_timestamping =
+ SOF_TIMESTAMPING_TX_SOFTWARE |
+ SOF_TIMESTAMPING_RX_SOFTWARE |
+ SOF_TIMESTAMPING_SOFTWARE |
+ SOF_TIMESTAMPING_TX_HARDWARE |
+ SOF_TIMESTAMPING_RX_HARDWARE |
+ SOF_TIMESTAMPING_RAW_HARDWARE;
+ info->phc_index = -1;
+ info->tx_types = BIT(HWTSTAMP_TX_ON);
+ info->rx_filters = BIT(HWTSTAMP_FILTER_ALL);
+
+ return 0;
+}
+EXPORT_SYMBOL(can_ethtool_op_get_ts_info_hwts);
+
/* Common open function when the device gets opened.
*
* This function should be called in the open function of the device
@@ -513,7 +556,7 @@ static __init int can_dev_init(void)
err = can_netlink_register();
if (!err)
- pr_info(MOD_DESC "\n");
+ pr_info("CAN device driver interface\n");
return err;
}
diff --git a/drivers/net/can/dev/netlink.c b/drivers/net/can/dev/netlink.c
index 7633d98e3912..8efa22d9f214 100644
--- a/drivers/net/can/dev/netlink.c
+++ b/drivers/net/can/dev/netlink.c
@@ -176,7 +176,8 @@ static int can_changelink(struct net_device *dev, struct nlattr *tb[],
* directly via do_set_bitrate(). Bail out if neither
* is given.
*/
- if (!priv->bittiming_const && !priv->do_set_bittiming)
+ if (!priv->bittiming_const && !priv->do_set_bittiming &&
+ !priv->bitrate_const)
return -EOPNOTSUPP;
memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
@@ -278,7 +279,8 @@ static int can_changelink(struct net_device *dev, struct nlattr *tb[],
* directly via do_set_bitrate(). Bail out if neither
* is given.
*/
- if (!priv->data_bittiming_const && !priv->do_set_data_bittiming)
+ if (!priv->data_bittiming_const && !priv->do_set_data_bittiming &&
+ !priv->data_bitrate_const)
return -EOPNOTSUPP;
memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
@@ -509,7 +511,8 @@ static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
if (priv->do_get_state)
priv->do_get_state(dev, &state);
- if ((priv->bittiming.bitrate &&
+ if ((priv->bittiming.bitrate != CAN_BITRATE_UNSET &&
+ priv->bittiming.bitrate != CAN_BITRATE_UNKNOWN &&
nla_put(skb, IFLA_CAN_BITTIMING,
sizeof(priv->bittiming), &priv->bittiming)) ||
diff --git a/drivers/net/can/dev/skb.c b/drivers/net/can/dev/skb.c
index 61660248c69e..07e0feac8629 100644
--- a/drivers/net/can/dev/skb.c
+++ b/drivers/net/can/dev/skb.c
@@ -5,6 +5,14 @@
*/
#include <linux/can/dev.h>
+#include <linux/can/netlink.h>
+#include <linux/module.h>
+
+#define MOD_DESC "CAN device driver interface"
+
+MODULE_DESCRIPTION(MOD_DESC);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
/* Local echo of CAN messages
*
@@ -64,6 +72,9 @@ int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
/* save frame_len to reuse it when transmission is completed */
can_skb_prv(skb)->frame_len = frame_len;
+ if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
+ skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
skb_tx_timestamp(skb);
/* save this skb for tx interrupt echo handling */
@@ -99,6 +110,9 @@ __can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr,
struct can_skb_priv *can_skb_priv = can_skb_prv(skb);
struct canfd_frame *cf = (struct canfd_frame *)skb->data;
+ if (skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)
+ skb_tstamp_tx(skb, skb_hwtstamps(skb));
+
/* get the real payload length for netdev statistics */
if (cf->can_id & CAN_RTR_FLAG)
*len_ptr = 0;
@@ -252,3 +266,67 @@ struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
return skb;
}
EXPORT_SYMBOL_GPL(alloc_can_err_skb);
+
+/* Check for outgoing skbs that have not been created by the CAN subsystem */
+static bool can_skb_headroom_valid(struct net_device *dev, struct sk_buff *skb)
+{
+ /* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */
+ if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv)))
+ return false;
+
+ /* af_packet does not apply CAN skb specific settings */
+ if (skb->ip_summed == CHECKSUM_NONE) {
+ /* init headroom */
+ can_skb_prv(skb)->ifindex = dev->ifindex;
+ can_skb_prv(skb)->skbcnt = 0;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ /* perform proper loopback on capable devices */
+ if (dev->flags & IFF_ECHO)
+ skb->pkt_type = PACKET_LOOPBACK;
+ else
+ skb->pkt_type = PACKET_HOST;
+
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ }
+
+ return true;
+}
+
+/* Drop a given socketbuffer if it does not contain a valid CAN frame. */
+bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb)
+{
+ const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+ struct can_priv *priv = netdev_priv(dev);
+
+ if (skb->protocol == htons(ETH_P_CAN)) {
+ if (unlikely(skb->len != CAN_MTU ||
+ cfd->len > CAN_MAX_DLEN))
+ goto inval_skb;
+ } else if (skb->protocol == htons(ETH_P_CANFD)) {
+ if (unlikely(skb->len != CANFD_MTU ||
+ cfd->len > CANFD_MAX_DLEN))
+ goto inval_skb;
+ } else {
+ goto inval_skb;
+ }
+
+ if (!can_skb_headroom_valid(dev, skb)) {
+ goto inval_skb;
+ } else if (priv->ctrlmode & CAN_CTRLMODE_LISTENONLY) {
+ netdev_info_once(dev,
+ "interface in listen only mode, dropping skb\n");
+ goto inval_skb;
+ }
+
+ return false;
+
+inval_skb:
+ kfree_skb(skb);
+ dev->stats.tx_dropped++;
+ return true;
+}
+EXPORT_SYMBOL_GPL(can_dropped_invalid_skb);
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-19 01:14:45 +0300