UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Vladimir Oltean 2022-02-16 16:30:14 +02:00 committed by David S. Miller
parent 9934800436
commit 29940ce32a
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/dsa/tag_ocelot_8021q.c
View File

@ -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;