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linux/net/dsa
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Vladimir Oltean ed1fe1bebe net: dsa: make dsa_master_ioctl() see through port_hwtstamp_get() shims 
There are multi-generational drivers like mv88e6xxx which have code like
this:

int mv88e6xxx_port_hwtstamp_get(struct dsa_switch *ds, int port,
				struct ifreq *ifr)
{
	if (!chip->info->ptp_support)
		return -EOPNOTSUPP;

	...
}

DSA wants to deny PTP timestamping on the master if the switch supports
timestamping too. However it currently relies on the presence of the
port_hwtstamp_get() callback to determine PTP capability, and this
clearly does not work in that case (method is present but returns
-EOPNOTSUPP).

We should not deny PTP on the DSA master for those switches which truly
do not support hardware timestamping.

Create a dsa_port_supports_hwtstamp() method which actually probes for
support by calling port_hwtstamp_get() and seeing whether that returned
-EOPNOTSUPP or not.

Fixes: f685e609a3 ("net: dsa: Deny PTP on master if switch supports it")
Link: https://patchwork.kernel.org/project/netdevbpf/patch/20221110124345.3901389-1-festevam@gmail.com/
Reported-by: Fabio Estevam <festevam@gmail.com>
Reported-by: Steffen Bätz <steffen@innosonix.de>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Tested-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-11-14 11:30:49 +00:00
..
dsa.c net: dsa: allow the DSA master to be seen and changed through rtnetlink 2022-09-20 10:32:35 +02:00
dsa2.c net: dsa: fall back to default tagger if we can't load the one from DT 2022-10-28 21:58:30 -07:00
dsa_priv.h net: dsa: make dsa_master_ioctl() see through port_hwtstamp_get() shims 2022-11-14 11:30:49 +00:00
Kconfig net: dsa: tag_ksz: add tag handling for Microchip LAN937x 2022-07-02 16:34:05 +01:00
Makefile net: dsa: allow the DSA master to be seen and changed through rtnetlink 2022-09-20 10:32:35 +02:00
master.c net: dsa: make dsa_master_ioctl() see through port_hwtstamp_get() shims 2022-11-14 11:30:49 +00:00
netlink.c net: dsa: make user ports return to init_net on netns deletion 2022-09-26 11:28:57 -07:00
port.c net: dsa: make dsa_master_ioctl() see through port_hwtstamp_get() shims 2022-11-14 11:30:49 +00:00
slave.c net: dsa: uninitialized variable in dsa_slave_netdevice_event() 2022-10-15 11:15:27 +01:00
switch.c net: dsa: allow masters to join a LAG 2022-09-20 10:32:36 +02:00
tag_8021q.c net: dsa: introduce dsa_port_get_master() 2022-09-20 10:32:35 +02:00
tag_ar9331.c
tag_brcm.c net: dsa: Fix spelling mistakes and cleanup code 2022-08-01 12:23:06 -07:00
tag_dsa.c net: dsa: tag_dsa: Fix tx from VLAN uppers on non-filtering bridges 2022-03-08 11:12:28 +01:00
tag_gswip.c
tag_hellcreek.c net: dsa: hellcreek: Print warning only once 2022-08-31 19:54:04 -07:00
tag_ksz.c net: dsa: tag_ksz: add tag handling for Microchip LAN937x 2022-07-02 16:34:05 +01:00
tag_lan9303.c net: dsa: lan9303: handle hwaccel VLAN tags 2022-02-17 09:32:06 -08:00
tag_mtk.c
tag_ocelot.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-23 16:09:58 -08:00
tag_ocelot_8021q.c net: dsa: tag_8021q: merge RX and TX VLANs 2022-02-27 11:06:14 +00:00
tag_qca.c net: dsa: tag_qca: add support for handling mgmt and MIB Ethernet packet 2022-02-02 14:43:59 +00:00
tag_rtl4_a.c net: dsa: tag_rtl4_a: Drop bit 9 from egress frames 2021-09-14 19:34:03 -07:00
tag_rtl8_4.c net: dsa: tag_rtl8_4: fix typo in modalias name 2022-03-09 20:36:24 -08:00
tag_rzn1_a5psw.c net: dsa: add Renesas RZ/N1 switch tag driver 2022-06-27 11:37:55 +01:00
tag_sja1105.c net: dsa: tag_8021q: rename dsa_8021q_bridge_tx_fwd_offload_vid 2022-02-27 11:06:14 +00:00
tag_trailer.c
tag_xrs700x.c