On 27.07.2022 17:29:25, Vincent MAILHOL wrote: > On Wed. 27 Jul. 2022 at 17:10, Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote: > > On 26.07.2022 19:24:54, Vincent Mailhol wrote: > > > Currently, userland has no method to query which timestamping features > > > are supported by the peak_usb driver (aside maybe of getting RX > > > messages and obseverse whever or not hardware timestamps stay at > > > zero). > > > > > > The canonical way for a network driver to advertise what kind of > > > timestamping it supports is to implement > > > ethtool_ops::get_ts_info(). Here, we use the CAN specific > > > can_ethtool_op_get_ts_info_hwts() function to achieve this. > > > > > > In addition, the driver currently does not support the hardware > > > timestamps ioctls. According to [1], SIOCSHWTSTAMP is "must" and > > > SIOCGHWTSTAMP is "should". This patch fills up that gap by > > > implementing net_device_ops::ndo_eth_ioctl() using the CAN specific > > > function can_eth_ioctl_hwts(). > > > > > > [1] kernel doc Timestamping, section 3.1: "Hardware Timestamping > > > Implementation: Device Drivers" > > > Link: https://docs.kernel.org/networking/timestamping.html#hardware-timestamping-implementation-device-drivers > > > > > > CC: Stephane Grosjean <s.grosjean@xxxxxxxxxxxxxxx> > > > Signed-off-by: Vincent Mailhol <mailhol.vincent@xxxxxxxxxx> > > > --- > > > > > > Hi Stéphane, as far as I understand, the pcan_usb and the pacn_usb_pro > > ^^^^ > > pcan > > > > > support hardware timestamps but the pcan_usb_fd doesn't. If not the > > > case, let me know. > > > > > > This is not tested. If you find any issue or if you want to modify, > > > feel free to pick up that patch and resend it. > > > > I have a: > > > > | Bus 002 Device 009: ID 0c72:0012 PEAK System PCAN-USB FD > > > > It supports hardware RX timestamps (Debian kernel 5.18.0-2-amd64) only: > > > > | (1970-01-01 01:00:00.000000) peakfd0 TX - - 002 [1] 01 > > | (1970-01-01 02:17:09.473817) peakfd0 RX - - 002 [1] 3C > > | (1970-01-01 01:00:00.000000) peakfd0 TX - - 002 [1] 02 > > | (1970-01-01 02:17:09.673980) peakfd0 RX - - 002 [1] 3D > > Thanks for the confirmation. So this means that all Peak hardware > supports the hardware timestamping. The PCAN-USB FD only support RX hardware timestamping, not TX. > This will greatly simplify the > logic. No need to have two different struct ethtool_ops. I will > prepare a v4. We have a peak_pciefd card: | 01:00.0 Network controller: PEAK-System Technik GmbH Device 0018 (rev 01) Only RX HW timestamps (Debian kernel 5.16.0-0.bpo.4-amd64): | (1970-01-01 01:00:00.000000) can0_iobus TX - - 601 [8] 40 0C 21 01 00 00 00 00 | (1970-02-16 18:25:06.810100) can0_iobus RX - - 581 [8] 53 0C 21 01 00 00 00 00 | (1970-01-01 01:00:00.000000) can0_iobus TX - - 602 [8] 40 0C 21 01 00 00 00 00 | (1970-02-16 18:25:06.819380) can0_iobus RX - - 582 [8] 53 0C 21 01 00 00 00 00 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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