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Date:   Fri, 9 Sep 2022 23:47:22 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     netdev@...r.kernel.org, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, matthias.bgg@...il.com,
        linux-mediatek@...ts.infradead.org, lorenzo.bianconi@...hat.com,
        Bo.Jiao@...iatek.com, sujuan.chen@...iatek.com,
        ryder.Lee@...iatek.com, evelyn.tsai@...iatek.com,
        devicetree@...r.kernel.org, robh@...nel.org
Subject: Re: [PATCH net-next 08/12] net: ethernet: mtk_eth_soc: add foe info
 in mtk_soc_data structure

> On Thu, Sep 08, 2022 at 09:33:42PM +0200, Lorenzo Bianconi wrote:
> > Introduce foe struct in mtk_soc_data as a container for foe table chip
> > related definitions.
> > This is a preliminary patch to enable mt7986 wed support.
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > ---
> >  drivers/net/ethernet/mediatek/mtk_eth_soc.c   |  70 +++++++-
> >  drivers/net/ethernet/mediatek/mtk_eth_soc.h   |  27 ++-
> >  drivers/net/ethernet/mediatek/mtk_ppe.c       | 161 ++++++++++--------
> >  drivers/net/ethernet/mediatek/mtk_ppe.h       |  29 ++--
> >  .../net/ethernet/mediatek/mtk_ppe_offload.c   |  34 ++--
> >  5 files changed, 208 insertions(+), 113 deletions(-)
> > 
> > [...]
> > diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.h b/drivers/net/ethernet/mediatek/mtk_ppe.h
> > index 6d4c91acd1a5..a364f45edf38 100644
> > --- a/drivers/net/ethernet/mediatek/mtk_ppe.h
> > +++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
> > @@ -61,6 +61,8 @@ enum {
> >  #define MTK_FOE_VLAN2_WINFO_WCID	GENMASK(13, 6)
> >  #define MTK_FOE_VLAN2_WINFO_RING	GENMASK(15, 14)
> >  
> > +#define MTK_FIELD_PREP(mask, val)	(((typeof(mask))(val) << __bf_shf(mask)) & (mask))
> > +#define MTK_FIELD_GET(mask, val)	((typeof(mask))(((val) & (mask)) >> __bf_shf(mask)))
> 
> This seems to trigger a compiler bug on ARMv7 (e.g. MT7623) builds:
> 
>   LD      .tmp_vmlinux.kallsyms1
> arm-openwrt-linux-muslgnueabi-ld: drivers/net/ethernet/mediatek/mtk_ppe.o: in function `mtk_flow_entry_match':
> /usr/src/lede/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-mediatek_mt7623/linux-5.15.67/drivers/net/ethernet/mediatek/mtk_ppe.c:406: undefined reference to `__ffsdi2'
> arm-openwrt-linux-muslgnueabi-ld: drivers/net/ethernet/mediatek/mtk_ppe.o: in function `__mtk_foe_entry_commit':
> /usr/src/lede/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-mediatek_mt7623/linux-5.15.67/drivers/net/ethernet/mediatek/mtk_ppe.c:533: undefined reference to `__ffsdi2'
> arm-openwrt-linux-muslgnueabi-ld: drivers/net/ethernet/mediatek/mtk_ppe.o: in function `mtk_foe_entry_l2':
> /usr/src/lede/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-mediatek_mt7623/linux-5.15.67/drivers/net/ethernet/mediatek/mtk_ppe.c:134: undefined reference to `__ffsdi2'
> arm-openwrt-linux-muslgnueabi-ld: drivers/net/ethernet/mediatek/mtk_ppe.o: in function `mtk_foe_entry_commit_subflow':
> /usr/src/lede/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-mediatek_mt7623/linux-5.15.67/drivers/net/ethernet/mediatek/mtk_ppe.c:611: undefined reference to `__ffsdi2'
> arm-openwrt-linux-muslgnueabi-ld: drivers/net/ethernet/mediatek/mtk_ppe.o: in function `mtk_foe_entry_ib2':
> /usr/src/lede/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-mediatek_mt7623/linux-5.15.67/drivers/net/ethernet/mediatek/mtk_ppe.c:148: undefined reference to `__ffsdi2'
> arm-openwrt-linux-muslgnueabi-ld: drivers/net/ethernet/mediatek/mtk_ppe.o:/usr/src/lede/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-mediatek_mt7623/linux-5.15.67/drivers/net/ethernet/mediatek/mtk_ppe.c:169: more undefined references to `__ffsdi2' follow

Hi Daniel,

ack, I will fix it in v2.

Regards,
Lorenzo

> 
> 
> >  enum {
> >  	MTK_FOE_STATE_INVALID,
> >  	MTK_FOE_STATE_UNBIND,

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