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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-02-14 01:37:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-02-15 04:31:44 +0300 |
| commit | 62bf5fde5e14640a2a732be9f6a661a488025eae (patch) | |
| tree | c6182e6ed4d4d0f105574c0bcdde2c4ec3803eb4 /net/dsa | |
| parent | 40d3f295b5feda409784e569550057b5fbc2a295 (diff) | |
| download | linux-62bf5fde5e14640a2a732be9f6a661a488025eae.tar.xz | |
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 <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
| -rw-r--r-- | net/dsa/tag_ocelot.c | 32 |
1 files changed, 21 insertions, 11 deletions
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 <soc/mscc/ocelot.h> #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; } |