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    Subject[PATCH v3 net-next 02/15] net: dsa: tag_8021q: introduce a vid_is_dsa_8021q helper
    Date
    From: Vladimir Oltean <vladimir.oltean@nxp.com>

    This function returns a boolean denoting whether the VLAN passed as
    argument is part of the 1024-3071 range that the dsa_8021q tagging
    scheme uses.

    Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
    Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
    ---
    Changes in v3:
    None.

    Changes in v2:
    None.

    include/linux/dsa/8021q.h | 7 +++++++
    net/dsa/tag_8021q.c | 7 +++++++
    2 files changed, 14 insertions(+)

    diff --git a/include/linux/dsa/8021q.h b/include/linux/dsa/8021q.h
    index b8daaec0896e..ebc245ff838a 100644
    --- a/include/linux/dsa/8021q.h
    +++ b/include/linux/dsa/8021q.h
    @@ -50,6 +50,8 @@ int dsa_8021q_rx_switch_id(u16 vid);

    int dsa_8021q_rx_source_port(u16 vid);

    +bool vid_is_dsa_8021q(u16 vid);
    +
    #else

    int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int index,
    @@ -107,6 +109,11 @@ int dsa_8021q_rx_source_port(u16 vid)
    return 0;
    }

    +bool vid_is_dsa_8021q(u16 vid)
    +{
    + return false;
    +}
    +
    #endif /* IS_ENABLED(CONFIG_NET_DSA_TAG_8021Q) */

    #endif /* _NET_DSA_8021Q_H */
    diff --git a/net/dsa/tag_8021q.c b/net/dsa/tag_8021q.c
    index ff9c5bf64bda..4774ecd1f8fc 100644
    --- a/net/dsa/tag_8021q.c
    +++ b/net/dsa/tag_8021q.c
    @@ -93,6 +93,13 @@ int dsa_8021q_rx_source_port(u16 vid)
    }
    EXPORT_SYMBOL_GPL(dsa_8021q_rx_source_port);

    +bool vid_is_dsa_8021q(u16 vid)
    +{
    + return ((vid & DSA_8021Q_DIR_MASK) == DSA_8021Q_DIR_RX ||
    + (vid & DSA_8021Q_DIR_MASK) == DSA_8021Q_DIR_TX);
    +}
    +EXPORT_SYMBOL_GPL(vid_is_dsa_8021q);
    +
    static int dsa_8021q_restore_pvid(struct dsa_switch *ds, int port)
    {
    struct bridge_vlan_info vinfo;
    --
    2.17.1
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