netdev - [RFC net-next 1/2] net: dsa: allow taggers to customise netdev features

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Message-Id: <20210825083832.2425886-2-dqfext@gmail.com>
Date:   Wed, 25 Aug 2021 16:38:30 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [RFC net-next 1/2] net: dsa: allow taggers to customise netdev features

Allow taggers to add netdev features, such as VLAN offload, to slave
devices, which will make it possible for taggers to handle VLAN tags
themselves.

Signed-off-by: DENG Qingfang <dqfext@...il.com>
---
 include/net/dsa.h | 2 ++
 net/dsa/slave.c   | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index f9a17145255a..f65442858f71 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -96,6 +96,8 @@ struct dsa_device_ops {
 	 * its RX filter.
 	 */
 	bool promisc_on_master;
+	/* Additional features to be applied to the slave. */
+	netdev_features_t features;
 };
 
 /* This structure defines the control interfaces that are overlayed by the
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 662ff531d4e2..6d6f1aebf1ca 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1885,7 +1885,8 @@ void dsa_slave_setup_tagger(struct net_device *slave)
 
 	p->xmit = cpu_dp->tag_ops->xmit;
 
-	slave->features = master->vlan_features | NETIF_F_HW_TC;
+	slave->features = master->vlan_features | cpu_dp->tag_ops->features |
+			  NETIF_F_HW_TC;
 	slave->hw_features |= NETIF_F_HW_TC;
 	slave->features |= NETIF_F_LLTX;
 	if (slave->needed_tailroom)
-- 
2.25.1