From: Arınç ÜNAL arinc.unal@arinc9.com
commit 04910d8cbfed65dad21c31723c6c1a8d9f990fb6 upstream.
The commit c6d96df9fa2c ("net: ethernet: mtk_eth_soc: drop generic vlan rx offload, only use DSA untagging") makes VLAN RX offloading to be only used on the SoCs without the MTK_NETSYS_V2 ability (which are not just MT7621 and MT7622). The commit disables the proper handling of special tagged (DSA) frames, added with commit 87e3df4961f4 ("net-next: ethernet: mediatek: add CDM able to recognize the tag for DSA"), for non MTK_NETSYS_V2 SoCs when it finds a MAC that does not use DSA. So if the other MAC uses DSA, the CDMQ component transmits DSA tagged frames to the CPU improperly. This issue can be observed on frames with TCP, for example, a TCP speed test using iperf3 won't work.
The commit disables the proper handling of special tagged (DSA) frames because it assumes that these SoCs don't use more than one MAC, which is wrong. Although I made Frank address this false assumption on the patch log when they sent the patch on behalf of Felix, the code still made changes with this assumption.
Therefore, the proper handling of special tagged (DSA) frames must be kept enabled in all circumstances as it doesn't affect non DSA tagged frames.
Hardware DSA untagging, introduced with the commit 2d7605a72906 ("net: ethernet: mtk_eth_soc: enable hardware DSA untagging"), and VLAN RX offloading are operations on the two CDM components of the frame engine, CDMP and CDMQ, which connect to Packet DMA (PDMA) and QoS DMA (QDMA) and are between the MACs and the CPU. These operations apply to all MACs of the SoC so if one MAC uses DSA and the other doesn't, the hardware DSA untagging operation will cause the CDMP component to transmit non DSA tagged frames to the CPU improperly.
Since the VLAN RX offloading feature configuration was dropped, VLAN RX offloading can only be used along with hardware DSA untagging. So, for the case above, we need to disable both features and leave it to the CPU, therefore software, to untag the DSA and VLAN tags.
So the correct way to handle this is:
For all SoCs:
Enable the proper handling of special tagged (DSA) frames (MTK_CDMQ_IG_CTRL).
For non MTK_NETSYS_V2 SoCs:
Enable hardware DSA untagging (MTK_CDMP_IG_CTRL). Enable VLAN RX offloading (MTK_CDMP_EG_CTRL).
When a non MTK_NETSYS_V2 SoC MAC does not use DSA:
Disable hardware DSA untagging (MTK_CDMP_IG_CTRL). Disable VLAN RX offloading (MTK_CDMP_EG_CTRL).
Fixes: c6d96df9fa2c ("net: ethernet: mtk_eth_soc: drop generic vlan rx offload, only use DSA untagging") Signed-off-by: Arınç ÜNAL arinc.unal@arinc9.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -3272,18 +3272,14 @@ static int mtk_open(struct net_device *d eth->dsa_meta[i] = md_dst; } } else { - /* Hardware special tag parsing needs to be disabled if at least - * one MAC does not use DSA. + /* Hardware DSA untagging and VLAN RX offloading need to be + * disabled if at least one MAC does not use DSA. */ u32 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
val &= ~MTK_CDMP_STAG_EN; mtk_w32(eth, val, MTK_CDMP_IG_CTRL);
- val = mtk_r32(eth, MTK_CDMQ_IG_CTRL); - val &= ~MTK_CDMQ_STAG_EN; - mtk_w32(eth, val, MTK_CDMQ_IG_CTRL); - mtk_w32(eth, 0, MTK_CDMP_EG_CTRL); }