diff options
| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2022-02-16 17:30:14 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-02-17 17:06:51 +0300 |
| commit | 29940ce32a2da2f3857d5fc459c6df6e47adb67e (patch) | |
| tree | 3820a0b33aeba63c2c6527abc01e33d042d1ca02 /net/dsa/tag_ocelot_8021q.c | |
| parent | 9934800436552d2a4af4aaca62d779b33d1f6a63 (diff) | |
| download | linux-29940ce32a2da2f3857d5fc459c6df6e47adb67e.tar.xz | |
net: dsa: tag_ocelot_8021q: calculate TX checksum in software for deferred packets
DSA inherits NETIF_F_CSUM_MASK from master->vlan_features, and the
expectation is that TX checksumming is offloaded and not done in
software.
Normally the DSA master takes care of this, but packets handled by
ocelot_defer_xmit() are a very special exception, because they are
actually injected into the switch through register-based MMIO. So the
DSA master is not involved at all for these packets => no one calculates
the checksum.
This allows PTP over UDP to work using the ocelot-8021q tagging
protocol.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa/tag_ocelot_8021q.c')
| -rw-r--r-- | net/dsa/tag_ocelot_8021q.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/dsa/tag_ocelot_8021q.c b/net/dsa/tag_ocelot_8021q.c index 68982b2789a5..bd6f1d0e5372 100644 --- a/net/dsa/tag_ocelot_8021q.c +++ b/net/dsa/tag_ocelot_8021q.c @@ -32,6 +32,13 @@ static struct sk_buff *ocelot_defer_xmit(struct dsa_port *dp, if (!xmit_work_fn || !xmit_worker) return NULL; + /* PTP over IP packets need UDP checksumming. We may have inherited + * NETIF_F_HW_CSUM from the DSA master, but these packets are not sent + * through the DSA master, so calculate the checksum here. + */ + if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb)) + return NULL; + xmit_work = kzalloc(sizeof(*xmit_work), GFP_ATOMIC); if (!xmit_work) return NULL; |