net: mscc: ocelot: don't downgrade timestamping RX filters in SIOCSHWTSTAMP

BugLink: https://bugs.launchpad.net/bugs/1953370
[ Upstream commit 8a075464d1e9317ffae0973dfe538a7511291a06 ]

The ocelot driver, when asked to timestamp all receiving packets, 1588
v1 or NTP, says "nah, here's 1588 v2 for you".

According to this discussion:
https://patchwork.kernel.org/project/netdevbpf/patch/20211104133204.19757-8-martin.kaistra@linutronix.de/#24577647
drivers that downgrade from a wider request to a narrower response (or
even a response where the intersection with the request is empty) are
buggy, and should return -ERANGE instead. This patch fixes that.

Fixes: 4e3b0468e6d7 ("net: mscc: PTP Hardware Clock (PHC) support")
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index a08e4f530c1c1186a55d8a1392a3786792c11396..08fafc4a7e813af063b3c6a5d6f896df57f73d59 100644 (file)
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1175,12 +1175,6 @@ int ocelot_hwstamp_set(struct ocelot *ocelot, int port, struct ifreq *ifr)
        switch (cfg.rx_filter) {
        case HWTSTAMP_FILTER_NONE:
                break;
-       case HWTSTAMP_FILTER_ALL:
-       case HWTSTAMP_FILTER_SOME:
-       case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
-       case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
-       case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
-       case HWTSTAMP_FILTER_NTP_ALL:
        case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
        case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
        case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: