netdev - [PATCH v3 net-next 14/15] net: dsa: felix: use promisc on master for PTP with tag

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Date:   Mon, 18 Jan 2021 18:17:30 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Hongbo Wang <hongbo.wang@....com>, Po Liu <po.liu@....com>,
        Yangbo Lu <yangbo.lu@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Eldar Gasanov <eldargasanov2@...il.com>,
        Andrey L <al@...omtech.com>, UNGLinuxDriver@...rochip.com
Subject: [PATCH v3 net-next 14/15] net: dsa: felix: use promisc on master for PTP with tag_8021q

From: Vladimir Oltean <vladimir.oltean@....com>

This is for the "no extraction IRQ" workaround, where the DSA master on
LS1028A (enetc) serves as a de-facto irqchip.

It needs to be promiscuous so that it will never drop a PTP frame (sent
to the 01-80-c2-00-00-0e multicast MAC address), otherwise the tagger
will get confused about which Ethernet PTP frame corresponds to which
PTP frame over the MMIO registers.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v3:
None.

Changes in v2:
Patch is new.

 net/dsa/tag_ocelot_8021q.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/dsa/tag_ocelot_8021q.c b/net/dsa/tag_ocelot_8021q.c
index 290880b94bb3..430d77d0b8eb 100644
--- a/net/dsa/tag_ocelot_8021q.c
+++ b/net/dsa/tag_ocelot_8021q.c
@@ -53,6 +53,7 @@ static struct dsa_device_ops ocelot_netdev_ops = {
 	.xmit			= ocelot_xmit,
 	.rcv			= ocelot_rcv,
 	.overhead		= VLAN_HLEN,
+	.promisc_on_master	= true,
 };
 
 MODULE_LICENSE("GPL v2");
-- 
2.25.1