netdev - Re: [PATCH v2] net: ethernet: mtk_eth_soc: fix state in __mtk_foe_entry

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Date:   Mon, 3 Oct 2022 14:47:42 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Matthieu Baerts <matthieu.baerts@...sares.net>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Sujuan Chen <sujuan.chen@...iatek.com>,
        Bo Jiao <Bo.Jiao@...iatek.com>, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chen Minqiang <ptpt52@...il.com>,
        Thomas Hühn <thomas.huehn@...nordhausen.de>
Subject: Re: [PATCH v2] net: ethernet: mtk_eth_soc: fix state in
 __mtk_foe_entry_clear: manual merge

On Mon, Oct 03, 2022 at 02:59:32PM +0200, Matthieu Baerts wrote:
> Hello,
> 
> On 30/09/2022 02:56, Daniel Golle wrote:
> > Setting ib1 state to MTK_FOE_STATE_UNBIND in __mtk_foe_entry_clear
> > routine as done by commit 0e80707d94e4c8 ("net: ethernet: mtk_eth_soc:
> > fix typo in __mtk_foe_entry_clear") breaks flow offloading, at least
> > on older MTK_NETSYS_V1 SoCs, OpenWrt users have confirmed the bug on
> > MT7622 and MT7621 systems.
> > Felix Fietkau suggested to use MTK_FOE_STATE_INVALID instead which
> > works well on both, MTK_NETSYS_V1 and MTK_NETSYS_V2.
> > 
> > Tested on MT7622 (Linksys E8450) and MT7986 (BananaPi BPI-R3).
> > 
> > Suggested-by: Felix Fietkau <nbd@....name>
> > Fixes: 0e80707d94e4c8 ("net: ethernet: mtk_eth_soc: fix typo in __mtk_foe_entry_clear")
> > Fixes: 33fc42de33278b ("net: ethernet: mtk_eth_soc: support creating mac address based offload entries")
> > Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> > ---
> > v2: rebased on top of netdev/net.git;main
> 
> FYI and as expected when reading this email thread, we got a small
> conflict when merging -net in net-next in the MPTCP tree due to this
> patch applied in -net:
> 
>   ae3ed15da588 ("net: ethernet: mtk_eth_soc: fix state in
> __mtk_foe_entry_clear")
> 
> and this one from net-next:
> 
>   9d8cb4c096ab ("net: ethernet: mtk_eth_soc: add foe_entry_size to
> mtk_eth_soc")
> 
> The conflict has been resolved on our side[1] inspired by Daniel's v1.
> The resolution we suggest is attached to this email.

conflict resolution: Acked-by: Daniel Golle <daniel@...rotopia.org>

> 
> Cheers,
> Matt
> 
> [1] https://github.com/multipath-tcp/mptcp_net-next/commit/7af5fac658ba
> -- 
> Tessares | Belgium | Hybrid Access Solutions
> www.tessares.net

> diff --cc drivers/net/ethernet/mediatek/mtk_ppe.c
> index 887f430734f7,148ea636ef97..ae00e572390d
> --- a/drivers/net/ethernet/mediatek/mtk_ppe.c
> +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
> @@@ -439,10 -410,9 +439,10 @@@ __mtk_foe_entry_clear(struct mtk_ppe *p
>   
>   	hlist_del_init(&entry->list);
>   	if (entry->hash != 0xffff) {
>  -		ppe->foe_table[entry->hash].ib1 &= ~MTK_FOE_IB1_STATE;
>  -		ppe->foe_table[entry->hash].ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE,
>  -							      MTK_FOE_STATE_INVALID);
>  +		struct mtk_foe_entry *hwe = mtk_foe_get_entry(ppe, entry->hash);
>  +
>  +		hwe->ib1 &= ~MTK_FOE_IB1_STATE;
> - 		hwe->ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE, MTK_FOE_STATE_UNBIND);
> ++		hwe->ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE, MTK_FOE_STATE_INVALID);
>   		dma_wmb();
>   	}
>   	entry->hash = 0xffff;