From 676068db69b847f06fe054fca15bf6b107bd24da Mon Sep 17 00:00:00 2001
From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Date: Tue, 7 Dec 2021 21:15:27 +0900
Subject: [PATCH] can: do not increase rx statistics when generating a CAN rx
error message frame
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 676068db69b847f06fe054fca15bf6b107bd24da
References: git-fixes
Patch-mainline: v5.17-rc1
The CAN error message frames (i.e. error skb) are an interface
specific to socket CAN. The payload of the CAN error message frames
does not correspond to any actual data sent on the wire. Only an error
flag and a delimiter are transmitted when an error occurs (c.f. ISO
11898-1 section 10.4.4.2 "Error flag").
For this reason, it makes no sense to increment the rx_packets and
rx_bytes fields of struct net_device_stats because no actual payload
were transmitted on the wire.
This patch fixes all the CAN drivers.
Link: https://lore.kernel.org/all/20211207121531.42941-2-mailhol.vincent@wanadoo.fr
CC: Marc Kleine-Budde <mkl@pengutronix.de>
CC: Nicolas Ferre <nicolas.ferre@microchip.com>
CC: Alexandre Belloni <alexandre.belloni@bootlin.com>
CC: Ludovic Desroches <ludovic.desroches@microchip.com>
CC: Chandrasekar Ramakrishnan <rcsekar@samsung.com>
CC: Maxime Ripard <mripard@kernel.org>
CC: Chen-Yu Tsai <wens@csie.org>
CC: Jernej Skrabec <jernej.skrabec@gmail.com>
CC: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
CC: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
CC: Michal Simek <michal.simek@xilinx.com>
CC: Stephane Grosjean <s.grosjean@peak-system.com>
Tested-by: Jimmy Assarsson <extja@kvaser.com> # kvaser
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Acked-by: Stefan Mätje <stefan.maetje@esd.eu> # esd_usb2
Tested-by: Stefan Mätje <stefan.maetje@esd.eu> # esd_usb2
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/net/can/at91_can.c | 6 ------
drivers/net/can/c_can/c_can_main.c | 5 -----
drivers/net/can/cc770/cc770.c | 3 ---
drivers/net/can/dev/dev.c | 4 ----
drivers/net/can/dev/rx-offload.c | 6 ++++--
drivers/net/can/ifi_canfd/ifi_canfd.c | 5 -----
drivers/net/can/kvaser_pciefd.c | 5 -----
drivers/net/can/m_can/m_can.c | 7 -------
drivers/net/can/mscan/mscan.c | 9 +++++----
drivers/net/can/pch_can.c | 3 ---
drivers/net/can/peak_canfd/peak_canfd.c | 4 ----
drivers/net/can/rcar/rcar_can.c | 6 +-----
drivers/net/can/rcar/rcar_canfd.c | 4 ----
drivers/net/can/sja1000/sja1000.c | 2 --
drivers/net/can/sun4i_can.c | 7 ++-----
drivers/net/can/usb/ems_usb.c | 2 --
drivers/net/can/usb/esd_usb2.c | 2 --
drivers/net/can/usb/etas_es58x/es58x_core.c | 7 -------
drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c | 2 --
drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 8 --------
drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 4 ----
drivers/net/can/usb/peak_usb/pcan_usb.c | 2 --
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 3 ---
drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 2 --
drivers/net/can/usb/ucan.c | 6 ++++--
drivers/net/can/usb/usb_8dev.c | 2 --
drivers/net/can/xilinx_can.c | 9 +--------
27 files changed, 17 insertions(+), 108 deletions(-)
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -553,8 +553,6 @@ static void at91_rx_overflow_err(struct
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
}
@@ -779,8 +777,6 @@ static int at91_poll_err(struct net_devi
at91_poll_err_frame(dev, cf, reg_sr);
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
@@ -1046,8 +1042,6 @@ static void at91_irq_err(struct net_devi
at91_irq_err_state(dev, cf, new_state);
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += cf->len;
netif_rx(skb);
priv->can.state = new_state;
--- a/drivers/net/can/c_can/c_can_main.c
+++ b/drivers/net/can/c_can/c_can_main.c
@@ -875,7 +875,6 @@ static int c_can_handle_state_change(str
unsigned int reg_err_counter;
unsigned int rx_err_passive;
struct c_can_priv *priv = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
@@ -951,8 +950,6 @@ static int c_can_handle_state_change(str
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
@@ -1019,8 +1016,6 @@ static int c_can_handle_bus_err(struct n
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
}
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -499,7 +499,6 @@ static void cc770_rx(struct net_device *
static int cc770_err(struct net_device *dev, u8 status)
{
struct cc770_priv *priv = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u8 lec;
@@ -571,8 +570,6 @@ static int cc770_err(struct net_device *
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@@ -135,7 +135,6 @@ EXPORT_SYMBOL_GPL(can_change_state);
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;
@@ -154,9 +153,6 @@ static void can_restart(struct net_devic
cf->can_id |= CAN_ERR_RESTARTED;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
netif_rx_ni(skb);
restart:
--- a/drivers/net/can/dev/rx-offload.c
+++ b/drivers/net/can/dev/rx-offload.c
@@ -54,8 +54,10 @@ static int can_rx_offload_napi_poll(stru
struct can_frame *cf = (struct can_frame *)skb->data;
work_done++;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (!(cf->can_id & CAN_ERR_FLAG)) {
+ stats->rx_packets++;
+ stats->rx_bytes += cf->len;
+ }
netif_receive_skb(skb);
}
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -430,8 +430,6 @@ static int ifi_canfd_handle_lec_err(stru
priv->base + IFI_CANFD_INTERRUPT);
writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
@@ -456,7 +454,6 @@ static int ifi_canfd_handle_state_change
enum can_state new_state)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
@@ -522,8 +519,6 @@ static int ifi_canfd_handle_state_change
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_receive_skb(skb);
return 1;
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1310,9 +1310,6 @@ static int kvaser_pciefd_rx_error_frame(
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
netif_rx(skb);
return 0;
}
@@ -1510,8 +1507,6 @@ static void kvaser_pciefd_handle_nack_pa
if (skb) {
cf->can_id |= CAN_ERR_BUSERROR;
- stats->rx_bytes += cf->len;
- stats->rx_packets++;
netif_rx(skb);
} else {
stats->rx_dropped++;
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -620,9 +620,6 @@ static int m_can_handle_lec_err(struct n
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
if (cdev->is_peripheral)
timestamp = m_can_get_timestamp(cdev);
@@ -679,7 +676,6 @@ static int m_can_handle_state_change(str
enum can_state new_state)
{
struct m_can_classdev *cdev = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
@@ -744,9 +740,6 @@ static int m_can_handle_state_change(str
break;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
-
if (cdev->is_peripheral)
timestamp = m_can_get_timestamp(cdev);
--- a/drivers/net/can/mscan/mscan.c
+++ b/drivers/net/can/mscan/mscan.c
@@ -401,13 +401,14 @@ static int mscan_rx_poll(struct napi_str
continue;
}
- if (canrflg & MSCAN_RXF)
+ if (canrflg & MSCAN_RXF) {
mscan_get_rx_frame(dev, frame);
- else if (canrflg & MSCAN_ERR_IF)
+ stats->rx_packets++;
+ stats->rx_bytes += frame->len;
+ } else if (canrflg & MSCAN_ERR_IF) {
mscan_get_err_frame(dev, frame, canrflg);
+ }
- stats->rx_packets++;
- stats->rx_bytes += frame->len;
work_done++;
netif_receive_skb(skb);
}
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -561,9 +561,6 @@ static void pch_can_error(struct net_dev
priv->can.state = state;
netif_receive_skb(skb);
-
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
}
static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@@ -409,8 +409,6 @@ static int pucan_handle_status(struct pe
return -ENOMEM;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
pucan_netif_rx(skb, msg->ts_low, msg->ts_high);
return 0;
@@ -438,8 +436,6 @@ static int pucan_handle_cache_critical(s
cf->data[6] = priv->bec.txerr;
cf->data[7] = priv->bec.rxerr;
- stats->rx_bytes += cf->len;
- stats->rx_packets++;
netif_rx(skb);
return 0;
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -223,7 +223,6 @@ static void tx_failure_cleanup(struct ne
static void rcar_can_error(struct net_device *ndev)
{
struct rcar_can_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u8 eifr, txerr = 0, rxerr = 0;
@@ -362,11 +361,8 @@ static void rcar_can_error(struct net_de
}
}
- if (skb) {
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (skb)
netif_rx(skb);
- }
}
static void rcar_can_tx_done(struct net_device *ndev)
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1024,8 +1024,6 @@ static void rcar_canfd_error(struct net_
/* Clear channel error interrupts that are handled */
rcar_canfd_write(priv->base, RCANFD_CERFL(ch),
RCANFD_CERFL_ERR(~cerfl));
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
@@ -1133,8 +1131,6 @@ static void rcar_canfd_state_change(stru
rx_state = txerr <= rxerr ? state : 0;
can_change_state(ndev, cf, tx_state, rx_state);
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -487,8 +487,6 @@ static int sja1000_err(struct net_device
can_bus_off(dev);
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -622,13 +622,10 @@ static int sun4i_can_err(struct net_devi
can_bus_off(dev);
}
- if (likely(skb)) {
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (likely(skb))
netif_rx(skb);
- } else {
+ else
return -ENOMEM;
- }
return 0;
}
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -397,8 +397,6 @@ static void ems_usb_rx_err(struct ems_us
stats->rx_errors++;
}
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -293,8 +293,6 @@ static void esd_usb2_rx_event(struct esd
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
}
--- a/drivers/net/can/usb/etas_es58x/es58x_core.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
@@ -849,13 +849,6 @@ int es58x_rx_err_msg(struct net_device *
break;
}
- /* driver/net/can/dev.c:can_restart() takes in account error
- * messages in the RX stats. Doing the same here for
- * consistency.
- */
- netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += CAN_ERR_DLC;
-
if (cf) {
if (cf->data[1])
cf->can_id |= CAN_ERR_CRTL;
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -279,8 +279,6 @@ int kvaser_usb_can_rx_over_error(struct
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
return 0;
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -870,7 +870,6 @@ static void kvaser_usb_hydra_update_stat
struct net_device *netdev = priv->netdev;
struct can_frame *cf;
struct sk_buff *skb;
- struct net_device_stats *stats;
enum can_state new_state, old_state;
old_state = priv->can.state;
@@ -920,9 +919,6 @@ static void kvaser_usb_hydra_update_stat
cf->data[6] = bec->txerr;
cf->data[7] = bec->rxerr;
- stats = &netdev->stats;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
@@ -1075,8 +1071,6 @@ kvaser_usb_hydra_error_frame(struct kvas
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
priv->bec.txerr = bec.txerr;
@@ -1110,8 +1104,6 @@ static void kvaser_usb_hydra_one_shot_fa
}
stats->tx_errors++;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -642,8 +642,6 @@ static void kvaser_usb_leaf_tx_acknowled
if (skb) {
cf->can_id |= CAN_ERR_RESTARTED;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
} else {
netdev_err(priv->netdev,
@@ -844,8 +842,6 @@ static void kvaser_usb_leaf_rx_error(con
cf->data[6] = es->txerr;
cf->data[7] = es->rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -593,8 +593,6 @@ static int pcan_usb_decode_error(struct
&hwts->hwtstamp);
}
- mc->netdev->stats.rx_packets++;
- mc->netdev->stats.rx_bytes += cf->len;
netif_rx(skb);
return 0;
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -577,9 +577,6 @@ static int pcan_usb_fd_decode_status(str
if (!skb)
return -ENOMEM;
- netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += cf->len;
-
peak_usb_netif_rx(skb, &usb_if->time_ref, le32_to_cpu(sm->ts_low));
return 0;
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -660,8 +660,6 @@ static int pcan_usb_pro_handle_error(str
hwts = skb_hwtstamps(skb);
peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(er->ts32), &hwts->hwtstamp);
- netdev->stats.rx_packets++;
- netdev->stats.rx_bytes += can_frame->len;
netif_rx(skb);
return 0;
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -621,8 +621,10 @@ static void ucan_rx_can_msg(struct ucan_
memcpy(cf->data, m->msg.can_msg.data, cf->len);
/* don't count error frames as real packets */
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (!(cf->can_id & CAN_ERR_FLAG)) {
+ stats->rx_packets++;
+ stats->rx_bytes += cf->len;
+ }
/* pass it to Linux */
netif_rx(skb);
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -447,8 +447,6 @@ static void usb_8dev_rx_err_msg(struct u
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
netif_rx(skb);
}
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -966,13 +966,8 @@ static void xcan_update_error_state_afte
xcan_set_error_state(ndev, new_state, skb ? cf : NULL);
- if (skb) {
- struct net_device_stats *stats = &ndev->stats;
-
- stats->rx_packets++;
- stats->rx_bytes += cf->len;
+ if (skb)
netif_rx(skb);
- }
}
}
@@ -1096,8 +1091,6 @@ static void xcan_err_interrupt(struct ne
if (skb) {
skb_cf->can_id |= cf.can_id;
memcpy(skb_cf->data, cf.data, CAN_ERR_DLC);
- stats->rx_packets++;
- stats->rx_bytes += CAN_ERR_DLC;
netif_rx(skb);
}
}