> -----Original Message-----
> From: Sergey Shtylyov <s.shtylyov@xxxxxx>
> Sent: 30 September 2021 21:39
> To: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>; David S. Miller
> <davem@xxxxxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>
> Cc: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>;
> Andrew Lunn <andrew@xxxxxxx>; Sergei Shtylyov <sergei.shtylyov@xxxxxxxxx>;
> Geert Uytterhoeven <geert+renesas@xxxxxxxxx>; Adam Ford
> <aford173@xxxxxxxxx>; Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@xxxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx; linux-renesas-
> soc@xxxxxxxxxxxxxxx; Chris Paterson <Chris.Paterson2@xxxxxxxxxxx>; Biju
> Das <biju.das@xxxxxxxxxxxxxx>
> Subject: Re: [RFC/PATCH 18/18] ravb: Add set_feature support for RZ/G2L
>
> On 9/23/21 5:08 PM, Biju Das wrote:
>
> > This patch adds set_feature support for RZ/G2L.
> >
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > ---
> > drivers/net/ethernet/renesas/ravb.h | 32 ++++++++++++++
> > drivers/net/ethernet/renesas/ravb_main.c | 56
> > +++++++++++++++++++++++-
> > 2 files changed, 87 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/renesas/ravb.h
> > b/drivers/net/ethernet/renesas/ravb.h
> > index d42e8ea981df..2275f27c0672 100644
> > --- a/drivers/net/ethernet/renesas/ravb.h
> > +++ b/drivers/net/ethernet/renesas/ravb.h
> > @@ -209,6 +209,8 @@ enum ravb_reg {
> > CXR56 = 0x0770, /* Documented for RZ/G2L only */
> > MAFCR = 0x0778,
> > CSR0 = 0x0800, /* Documented for RZ/G2L only */
> > + CSR1 = 0x0804, /* Documented for RZ/G2L only */
> > + CSR2 = 0x0808, /* Documented for RZ/G2L only */
>
> These are the TOE regs (CSR0 included), they only exist on RZ/G2L, no?
>
> [...]
> > @@ -978,6 +980,36 @@ enum CSR0_BIT {
> > CSR0_RPE = 0x00000020,
> > };
> >
>
> *enum* CSR0_BIT should be here (as we concluded).
>
> > +enum CSR1_BIT {
> [...]
> > diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> > b/drivers/net/ethernet/renesas/ravb_main.c
> > index 72aea5875bc5..641ae5553b64 100644
> > --- a/drivers/net/ethernet/renesas/ravb_main.c
> > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> [...]
> > @@ -2290,7 +2308,38 @@ static void ravb_set_rx_csum(struct net_device
> > *ndev, bool enable) static int ravb_set_features_rgeth(struct
> net_device *ndev,
> > netdev_features_t features)
> > {
> > - /* Place holder */
> > + netdev_features_t changed = features ^ ndev->features;
> > + unsigned int reg;
>
> u32 reg;
>
> > + int error;
> > +
> > + reg = ravb_read(ndev, CSR0);
>
> ... as this function returns u32.
>
> > +
> > + ravb_write(ndev, reg & ~(CSR0_RPE | CSR0_TPE), CSR0);
> > + error = ravb_wait(ndev, CSR0, CSR0_RPE | CSR0_TPE, 0);
> > + if (error) {
> > + ravb_write(ndev, reg, CSR0);
> > + return error;
> > + }
> > +
> > + if (changed & NETIF_F_RXCSUM) {
> > + if (features & NETIF_F_RXCSUM)
> > + ravb_write(ndev, CSR2_ALL, CSR2);
> > + else
> > + ravb_write(ndev, 0, CSR2);
> > + }
> > +
> > + if (changed & NETIF_F_HW_CSUM) {
> > + if (features & NETIF_F_HW_CSUM) {
> > + ravb_write(ndev, CSR1_ALL, CSR1);
> > + ndev->features |= NETIF_F_CSUM_MASK;
>
> Hm, I don't understand this... it would be nice if someone
> knowledgeable about the offloads would look at this... Although, without
> the register documentation it's possibly vain...
You can download the document from here [1]
[1] https://www.renesas.com/document/mah/rzg2l-group-rzg2lc-group-users-manual-hardware-0?language=en&r=1467981
Regards,
Biju
>
> > + } else {
> > + ravb_write(ndev, 0, CSR1);
> > + }
> > + }
> > + ravb_write(ndev, reg, CSR0);
> > +
> > + ndev->features = features;
> > +
> > return 0;
> > }
> >
> > @@ -2432,6 +2481,11 @@ static const struct ravb_hw_info rgeth_hw_info =
> {
> > .set_feature = ravb_set_features_rgeth,
> > .dmac_init = ravb_dmac_init_rgeth,
> > .emac_init = ravb_emac_init_rgeth,
> > + .net_hw_features = (NETIF_F_HW_CSUM | NETIF_F_RXCSUM),
> > + .gstrings_stats = ravb_gstrings_stats_rgeth,
> > + .gstrings_size = sizeof(ravb_gstrings_stats_rgeth),
> > + .stats_len = ARRAY_SIZE(ravb_gstrings_stats_rgeth),
>
> These seem unrelated, couldn't it be moved to a spearate patch?
>
> > + .max_rx_len = RGETH_RX_BUFF_MAX + RAVB_ALIGN - 1,
>
> This seems unrelsated and misplaced too.
>
> [...]
>
> MBR, Sergey
