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Date: Sat, 17 Jun 2017 11:54:00 +0000
From: Salil Mehta <salil.mehta@...wei.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "davem@...emloft.net" <davem@...emloft.net>,
"Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
huangdaode <huangdaode@...ilicon.com>,
"lipeng (Y)" <lipeng321@...wei.com>,
"mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Linuxarm <linuxarm@...wei.com>
Subject: RE: [PATCH V2 net-next 7/8] net: hns3: Add Ethtool support to HNS3
driver
Hi Andrew,
> -----Original Message-----
> From: Andrew Lunn [mailto:andrew@...n.ch]
> Sent: Wednesday, June 14, 2017 3:32 AM
> To: Salil Mehta
> Cc: davem@...emloft.net; Zhuangyuzeng (Yisen); huangdaode; lipeng (Y);
> mehta.salil.lnk@...il.com; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Linuxarm
> Subject: Re: [PATCH V2 net-next 7/8] net: hns3: Add Ethtool support to
> HNS3 driver
>
> > +static const struct hns3_link_mode_mapping hns3_lm_map[] = {
> > + {HNS3_LM_FIBRE_BIT, ETHTOOL_LINK_MODE_FIBRE_BIT},
> > + {HNS3_LM_AUTONEG_BIT, ETHTOOL_LINK_MODE_Autoneg_BIT},
> > + {HNS3_LM_TP_BIT, ETHTOOL_LINK_MODE_TP_BIT},
> > + {HNS3_LM_PAUSE_BIT, ETHTOOL_LINK_MODE_Pause_BIT},
> > + {HNS3_LM_BACKPLANE_BIT, ETHTOOL_LINK_MODE_Backplane_BIT},
> > + {HNS3_LM_10BASET_HALF_BIT, ETHTOOL_LINK_MODE_10baseT_Half_BIT},
> > + {HNS3_LM_10BASET_FULL_BIT, ETHTOOL_LINK_MODE_10baseT_Full_BIT},
> > + {HNS3_LM_100BASET_HALF_BIT, ETHTOOL_LINK_MODE_100baseT_Half_BIT},
> > + {HNS3_LM_100BASET_FULL_BIT, ETHTOOL_LINK_MODE_100baseT_Full_BIT},
> > + {HNS3_LM_1000BASET_FULL_BIT,
> ETHTOOL_LINK_MODE_1000baseT_Full_BIT},
> > + {HNS3_LM_10000BASEKR_FULL_BIT,
> ETHTOOL_LINK_MODE_10000baseKR_Full_BIT},
> > + {HNS3_LM_25000BASEKR_FULL_BIT,
> ETHTOOL_LINK_MODE_25000baseKR_Full_BIT},
> > + {HNS3_LM_40000BASELR4_FULL_BIT,
> > + ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT},
> > + {HNS3_LM_50000BASEKR2_FULL_BIT,
> > + ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT},
> > + {HNS3_LM_100000BASEKR4_FULL_BIT,
> > + ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT},
> > +};
>
> I don't see anywhere your HNS3_LM_ enum's get used by the hardware. So
> it would be better to just use the Linux values and avoid this
> translation macro:
Actually, the whole idea is to set bits in "supported" & " advertising"
bitmap fields part of the " struct ethtool_link_ksettings *cmd".
Mapping structure "hns3_link_mode_mapping hns3_lm_map" and its corresponding
Bit set macro HNS3_DRV_TO_ETHTOOL_CAPS() is exactly being used to
Map and populate these bits in the above 2 bitmaps.
Without above we would end up using below macros for each of the bits being
Set separately and will clog the hns3_get_link_ksettings() function something
similar to below:
static int hns3_get_link_ksettings(struct net_device *net_dev,
struct ethtool_link_ksettings *cmd)
{
[....]
<........un-necessary repetition of the macros.........>
/* setting bit ETHTOOL_LINK_MODE_100baseT_Full_BIT */
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,
100baseT_Full);
/* setting bit ETHTOOL_LINK_MODE_1000baseT_Full_BIT */
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,
1000baseT_Full);
/* setting bit ETHTOOL_LINK_MODE_1000baseT_Full_BIT */
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,
10000baseT_Full);
[....]
}
OR another solution could be just include all of above repetition
of macros as one single macros, for example Broadcom driver has
done the same:
static void bnxt_fw_to_ethtool_advertised_spds(struct bnxt_link_info *link_info,
struct ethtool_link_ksettings *lk_ksettings)
{
[....]
if (link_info->autoneg & BNXT_AUTONEG_FLOW_CTRL)
fw_pause = link_info->auto_pause_setting;
BNXT_FW_TO_ETHTOOL_SPDS(fw_speeds, fw_pause, lk_ksettings, advertising);
}
#define BNXT_FW_TO_ETHTOOL_SPDS(fw_speeds, fw_pause, lk_ksettings, name)\
{ \
if ((fw_speeds) & BNXT_LINK_SPEED_MSK_100MB) \
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,\
100baseT_Full); \
if ((fw_speeds) & BNXT_LINK_SPEED_MSK_1GB) \
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,\
1000baseT_Full); \
if ((fw_speeds) & BNXT_LINK_SPEED_MSK_10GB) \
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,\
10000baseT_Full); \
if ((fw_speeds) & BNXT_LINK_SPEED_MSK_25GB) \
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,\
25000baseCR_Full); \
if ((fw_speeds) & BNXT_LINK_SPEED_MSK_40GB) \
ethtool_link_ksettings_add_link_mode(lk_ksettings, name,\
40000baseCR4_Full);\
[....] \
}
We thought mapping macros like ETHTOOL_LINK_MODE_*_BIT
to our own internal macros like HNS3_LM_* using
struct hns3_link_mode_mapping {
u32 hns3_link_mode;
u32 ethtool_link_mode;
};
1. Gives us control to set all these bits using the iterative loop.
in macro HNS3_DRV_TO_ETHTOOL_CAPS()
2. Specifying the speed bit to be set becomes more cleaner and easier using
below syntax. It is just an OR operation:
supported_caps = HNS3_LM_BACKPLANE_BIT |
HNS3_LM_PAUSE_BIT |
HNS3_LM_AUTONEG_BIT |
HNS3_LM_40000BASELR4_FULL_BIT |
HNS3_LM_10000BASEKR_FULL_BIT |
HNS3_LM_1000BASET_FULL_BIT |
HNS3_LM_100BASET_FULL_BIT |
HNS3_LM_100BASET_HALF_BIT |
HNS3_LM_10BASET_FULL_BIT |
HNS3_LM_10BASET_HALF_BIT;
We would like to retain this format. Hope this explanation is fine?
Best regards
Salil
>
> > +
> > +#define HNS3_DRV_TO_ETHTOOL_CAPS(caps, lk_ksettings, name) \
> > +{ \
> > + int i; \
> > + \
> > + for (i = 0; i < ARRAY_SIZE(hns3_lm_map); i++) { \
> > + if ((caps) & hns3_lm_map[i].hns3_link_mode) \
> > + __set_bit(hns3_lm_map[i].ethtool_link_mode,\
> > + (lk_ksettings)->link_modes.name); \
> > + } \
> > +}
>
> Andrew
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