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Date: Mon, 9 Nov 2020 21:12:01 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Oliver Hartkopp <socketcan@...tkopp.net>,
linux-can@...r.kernel.org, mailhol.vincent@...adoo.fr
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH v5 8/8] can-dev: add len8_dlc support for various CAN USB
adapters
On 11/9/20 4:36 PM, Oliver Hartkopp wrote:
> Support the Classical CAN raw DLC functionality to send and receive DLC
> values from 9 .. 15 on various Classical CAN capable USB network drivers:
>
> - gs_usb
> - pcan_usb
> - pcan_usb_fd
> - usb_8dev
>
> Tested-by: Oliver Hartkopp <socketcan@...tkopp.net>
> Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
> ---
> drivers/net/can/usb/gs_usb.c | 8 ++++++--
> drivers/net/can/usb/peak_usb/pcan_usb.c | 8 ++++++--
> drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 17 ++++++++++++-----
> drivers/net/can/usb/usb_8dev.c | 9 ++++++---
> 4 files changed, 30 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
> index 940589667a7f..cc0c30a33335 100644
> --- a/drivers/net/can/usb/gs_usb.c
> +++ b/drivers/net/can/usb/gs_usb.c
> @@ -330,10 +330,13 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
> return;
>
> cf->can_id = hf->can_id;
>
> cf->len = can_cc_dlc2len(hf->len);
> + cf->len8_dlc = can_get_len8_dlc(dev->can.ctrlmode, cf->len,
> + hf->len);
What about introducing a function that sets len and len8_dlc at the same time:
void can_frame_set_length(const struct can_priv *can, struct can_frame *cfd, u8
dlc);
And maybe a function that takes a canfd_frame, so that we don't need to cast....
> +
> memcpy(cf->data, hf->data, 8);
>
> /* ERROR frames tell us information about the controller */
> if (hf->can_id & CAN_ERR_FLAG)
> gs_update_state(dev, cf);
> @@ -502,11 +505,12 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
> hf->channel = dev->channel;
>
> cf = (struct can_frame *)skb->data;
>
> hf->can_id = cf->can_id;
> - hf->len = cf->len;
> + hf->len = can_get_cc_dlc(dev->can.ctrlmode, cf->len, cf->len8_dlc);
> +
> memcpy(hf->data, cf->data, cf->len);
>
> usb_fill_bulk_urb(urb, dev->udev,
> usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
> hf,
> @@ -856,11 +860,11 @@ static struct gs_can *gs_make_candev(unsigned int channel,
> dev->can.state = CAN_STATE_STOPPED;
> dev->can.clock.freq = bt_const->fclk_can;
> dev->can.bittiming_const = &dev->bt_const;
> dev->can.do_set_bittiming = gs_usb_set_bittiming;
>
> - dev->can.ctrlmode_supported = 0;
> + dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
>
> if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
> dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
>
> if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
> index ec34f87cc02c..5a8dffacc24e 100644
> --- a/drivers/net/can/usb/peak_usb/pcan_usb.c
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
> @@ -733,10 +733,12 @@ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
>
> cf->can_id = le16_to_cpu(tmp16) >> 5;
> }
>
> cf->len = can_cc_dlc2len(rec_len);
> + cf->len8_dlc = can_get_len8_dlc(mc->pdev->dev.can.ctrlmode, cf->len,
> + rec_len);
>
> /* Only first packet timestamp is a word */
> if (pcan_usb_decode_ts(mc, !mc->rec_ts_idx))
> goto decode_failed;
>
> @@ -836,11 +838,12 @@ static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
> obuf[1] = 1;
>
> pc = obuf + PCAN_USB_MSG_HEADER_LEN;
>
> /* status/len byte */
> - *pc = cf->len;
> + *pc = can_get_cc_dlc(dev->can.ctrlmode, cf->len, cf->len8_dlc);
> +
> if (cf->can_id & CAN_RTR_FLAG)
> *pc |= PCAN_USB_STATUSLEN_RTR;
>
> /* can id */
> if (cf->can_id & CAN_EFF_FLAG) {
> @@ -990,11 +993,12 @@ static const struct can_bittiming_const pcan_usb_const = {
> const struct peak_usb_adapter pcan_usb = {
> .name = "PCAN-USB",
> .device_id = PCAN_USB_PRODUCT_ID,
> .ctrl_count = 1,
> .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY |
> - CAN_CTRLMODE_BERR_REPORTING,
> + CAN_CTRLMODE_BERR_REPORTING |
> + CAN_CTRLMODE_CC_LEN8_DLC,
> .clock = {
> .freq = PCAN_USB_CRYSTAL_HZ / 2 ,
> },
> .bittiming_const = &pcan_usb_const,
>
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
> index 761e78d8e647..8020071c9067 100644
> --- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
> @@ -492,16 +492,21 @@ static int pcan_usb_fd_decode_canmsg(struct pcan_usb_fd_if *usb_if,
> if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
> cfd->flags |= CANFD_ESI;
>
> cfd->len = can_fd_dlc2len(pucan_msg_get_dlc(rm));
> } else {
> + struct can_frame *cf;
> +
> /* CAN 2.0 frame case */
> skb = alloc_can_skb(netdev, (struct can_frame **)&cfd);
> if (!skb)
> return -ENOMEM;
>
> cfd->len = can_cc_dlc2len(pucan_msg_get_dlc(rm));
> + cf = (struct can_frame *)cfd;
> + cf->len8_dlc = can_get_len8_dlc(dev->can.ctrlmode, cf->len,
> + pucan_msg_get_dlc(rm));
> }
>
> cfd->can_id = le32_to_cpu(rm->can_id);
>
> if (rx_msg_flags & PUCAN_MSG_EXT_ID)
> @@ -764,12 +769,14 @@ static int pcan_usb_fd_encode_msg(struct peak_usb_device *dev,
> tx_msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
>
> if (cfd->flags & CANFD_ESI)
> tx_msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
> } else {
> + struct can_frame *cf = (struct can_frame *)cfd;
> +
> /* CAND 2.0 frames */
> - len = cfd->len;
> + len = can_get_cc_dlc(dev->can.ctrlmode, cf->len, cf->len8_dlc);
>
> if (cfd->can_id & CAN_RTR_FLAG)
> tx_msg_flags |= PUCAN_MSG_RTR;
> }
>
> @@ -1033,11 +1040,11 @@ static const struct can_bittiming_const pcan_usb_fd_data_const = {
>
> const struct peak_usb_adapter pcan_usb_fd = {
> .name = "PCAN-USB FD",
> .device_id = PCAN_USBFD_PRODUCT_ID,
> .ctrl_count = PCAN_USBFD_CHANNEL_COUNT,
> - .ctrlmode_supported = CAN_CTRLMODE_FD |
> + .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
> CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
Please add the new CTRLMODE at the end, so that the list ist sorted. I don't
mind if the diff is a bit larger.
> .clock = {
> .freq = PCAN_UFD_CRYSTAL_HZ,
> },
> .bittiming_const = &pcan_usb_fd_const,
> @@ -1105,11 +1112,11 @@ static const struct can_bittiming_const pcan_usb_chip_data_const = {
>
> const struct peak_usb_adapter pcan_usb_chip = {
> .name = "PCAN-Chip USB",
> .device_id = PCAN_USBCHIP_PRODUCT_ID,
> .ctrl_count = PCAN_USBFD_CHANNEL_COUNT,
> - .ctrlmode_supported = CAN_CTRLMODE_FD |
> + .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
> CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
same here
> .clock = {
> .freq = PCAN_UFD_CRYSTAL_HZ,
> },
> .bittiming_const = &pcan_usb_chip_const,
> @@ -1177,11 +1184,11 @@ static const struct can_bittiming_const pcan_usb_pro_fd_data_const = {
>
> const struct peak_usb_adapter pcan_usb_pro_fd = {
> .name = "PCAN-USB Pro FD",
> .device_id = PCAN_USBPROFD_PRODUCT_ID,
> .ctrl_count = PCAN_USBPROFD_CHANNEL_COUNT,
> - .ctrlmode_supported = CAN_CTRLMODE_FD |
> + .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
> CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
same here
> .clock = {
> .freq = PCAN_UFD_CRYSTAL_HZ,
> },
> .bittiming_const = &pcan_usb_pro_fd_const,
> @@ -1249,11 +1256,11 @@ static const struct can_bittiming_const pcan_usb_x6_data_const = {
>
> const struct peak_usb_adapter pcan_usb_x6 = {
> .name = "PCAN-USB X6",
> .device_id = PCAN_USBX6_PRODUCT_ID,
> .ctrl_count = PCAN_USBPROFD_CHANNEL_COUNT,
> - .ctrlmode_supported = CAN_CTRLMODE_FD |
> + .ctrlmode_supported = CAN_CTRLMODE_FD | CAN_CTRLMODE_CC_LEN8_DLC |
> CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
same here
> .clock = {
> .freq = PCAN_UFD_CRYSTAL_HZ,
> },
> .bittiming_const = &pcan_usb_x6_const,
> diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
> index 6517aaeb4bc0..57e689cb87c9 100644
> --- a/drivers/net/can/usb/usb_8dev.c
> +++ b/drivers/net/can/usb/usb_8dev.c
> @@ -469,10 +469,12 @@ static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
> if (!skb)
> return;
>
> cf->can_id = be32_to_cpu(msg->id);
> cf->len = can_cc_dlc2len(msg->dlc & 0xF);
> + cf->len8_dlc = can_get_len8_dlc(priv->can.ctrlmode, cf->len,
> + msg->dlc & 0xF);
>
> if (msg->flags & USB_8DEV_EXTID)
> cf->can_id |= CAN_EFF_FLAG;
>
> if (msg->flags & USB_8DEV_RTR)
> @@ -635,11 +637,11 @@ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
>
> if (cf->can_id & CAN_EFF_FLAG)
> msg->flags |= USB_8DEV_EXTID;
>
> msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
> - msg->dlc = cf->len;
> + msg->dlc = can_get_cc_dlc(priv->can.ctrlmode, cf->len, cf->len8_dlc);
> memcpy(msg->data, cf->data, cf->len);
> msg->end = USB_8DEV_DATA_END;
>
> for (i = 0; i < MAX_TX_URBS; i++) {
> if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
> @@ -925,12 +927,13 @@ static int usb_8dev_probe(struct usb_interface *intf,
> priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
> priv->can.bittiming_const = &usb_8dev_bittiming_const;
> priv->can.do_set_mode = usb_8dev_set_mode;
> priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
> priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> - CAN_CTRLMODE_LISTENONLY |
> - CAN_CTRLMODE_ONE_SHOT;
> + CAN_CTRLMODE_LISTENONLY |
> + CAN_CTRLMODE_ONE_SHOT |
> + CAN_CTRLMODE_CC_LEN8_DLC;
>
> netdev->netdev_ops = &usb_8dev_netdev_ops;
>
> netdev->flags |= IFF_ECHO; /* we support local echo */
>
>
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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