From 62bf5fde5e14640a2a732be9f6a661a488025eae Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Sun, 14 Feb 2021 00:37:57 +0200 Subject: net: dsa: tag_ocelot: single out PTP-related transmit tag processing There is one place where we cannot avoid accessing driver data, and that is 2-step PTP TX timestamping, since the switch wants us to provide a timestamp request ID through the injection header, which naturally must come from a sequence number kept by the driver (it is generated by the .port_txtstamp method prior to the tagger's xmit). However, since other drivers like dsa_loop do not claim PTP support anyway, the DSA_SKB_CB(skb)->clone will always be NULL anyway, so if we move all PTP-related dereferences of struct ocelot and struct ocelot_port into a separate function, we can effectively ensure that this is dead code when the ocelot tagger is attached to non-ocelot switches, and the stateful portion of the tagger is more self-contained. Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- net/dsa/tag_ocelot.c | 32 +++++++++++++++++++++----------- 1 file changed, 21 insertions(+), 11 deletions(-) (limited to 'net/dsa') diff --git a/net/dsa/tag_ocelot.c b/net/dsa/tag_ocelot.c index 8ce0b26f3520..fe00519229d7 100644 --- a/net/dsa/tag_ocelot.c +++ b/net/dsa/tag_ocelot.c @@ -5,6 +5,25 @@ #include #include "dsa_priv.h" +static void ocelot_xmit_ptp(struct dsa_port *dp, void *injection, + struct sk_buff *clone) +{ + struct ocelot *ocelot = dp->ds->priv; + struct ocelot_port *ocelot_port; + u64 rew_op; + + ocelot_port = ocelot->ports[dp->index]; + rew_op = ocelot_port->ptp_cmd; + + /* Retrieve timestamp ID populated inside skb->cb[0] of the + * clone by ocelot_port_add_txtstamp_skb + */ + if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) + rew_op |= clone->cb[0] << 3; + + ocelot_ifh_set_rew_op(injection, rew_op); +} + static struct sk_buff *ocelot_xmit(struct sk_buff *skb, struct net_device *netdev) { @@ -29,17 +48,8 @@ static struct sk_buff *ocelot_xmit(struct sk_buff *skb, ocelot_ifh_set_qos_class(injection, skb->priority); /* TX timestamping was requested */ - if (clone) { - u64 rew_op = ocelot_port->ptp_cmd; - - /* Retrieve timestamp ID populated inside skb->cb[0] of the - * clone by ocelot_port_add_txtstamp_skb - */ - if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) - rew_op |= clone->cb[0] << 3; - - ocelot_ifh_set_rew_op(injection, rew_op); - } + if (clone) + ocelot_xmit_ptp(dp, injection, clone); return skb; } -- cgit v1.2.3