Date:   Thu, 27 Jul 2017 18:01:33 +0000
From:   Salil Mehta <salil.mehta@...wei.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "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>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: RE: [PATCH V4 net-next 7/8] net: hns3: Add Ethtool support to HNS3
 driver

Hi Florian,

> -----Original Message-----
> From: Florian Fainelli [mailto:f.fainelli@...il.com]
> Sent: Sunday, July 23, 2017 6:05 PM
> To: Salil Mehta; davem@...emloft.net
> Cc: Zhuangyuzeng (Yisen); huangdaode; lipeng (Y);
> mehta.salil.lnk@...il.com; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-rdma@...r.kernel.org; Linuxarm
> Subject: Re: [PATCH V4 net-next 7/8] net: hns3: Add Ethtool support to
> HNS3 driver
> 
> 
> 
> On 07/22/2017 03:09 PM, Salil Mehta wrote:
> > This patch adds the support of the Ethtool interface to
> > the HNS3 Ethernet driver. Various commands to read the
> > statistics, configure the offloading, loopback selftest etc.
> > are supported.
> >
> > Signed-off-by: Daode Huang <huangdaode@...ilicon.com>
> > Signed-off-by: lipeng <lipeng321@...wei.com>
> > Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> > Signed-off-by: Yisen Zhuang <yisen.zhuang@...wei.com>
> > ---
> > Patch V4: addressed below comments
> >  1. Andrew Lunn
> >     Removed the support of loop PHY back for now
> > Patch V3: Address below comments
> >  1. Stephen Hemminger
> >     https://lkml.org/lkml/2017/6/13/974
> >  2. Andrew Lunn
> >     https://lkml.org/lkml/2017/6/13/1037
> > Patch V2: No change
> > Patch V1: Initial Submit
> > ---
> >  .../ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c  | 543
> +++++++++++++++++++++
> >  1 file changed, 543 insertions(+)
> >  create mode 100644
> drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c
> >
> > diff --git
> a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c
> b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c
> > new file mode 100644
> > index 000000000000..82b0d4d829f8
> > --- /dev/null
> > +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c
> > @@ -0,0 +1,543 @@
> > +/*
> > + * Copyright (c) 2016~2017 Hisilicon Limited.
> > + *
> > + * This program is free software; you can redistribute it and/or
> modify
> > + * it under the terms of the GNU General Public License as published
> by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#include <linux/etherdevice.h>
> > +#include "hns3_enet.h"
> > +
> > +struct hns3_stats {
> > +	char stats_string[ETH_GSTRING_LEN];
> > +	int stats_size;
> > +	int stats_offset;
> > +};
> > +
> > +/* netdev related stats */
> > +#define HNS3_NETDEV_STAT(_string, _member)			\
> > +	{ _string,						\
> > +	  FIELD_SIZEOF(struct rtnl_link_stats64, _member),	\
> > +	  offsetof(struct rtnl_link_stats64, _member),		\
> > +	}
> 
> Can you make this macro use named initializers?
Can you please explain bit more or point out some
example. This would be very handy. 

Thanks

> 
> > +
> > +static const struct hns3_stats hns3_netdev_stats[] = {
> > +	/* misc. Rx/Tx statistics */
> > +	HNS3_NETDEV_STAT("rx_packets", rx_packets),
> > +	HNS3_NETDEV_STAT("tx_packets", tx_packets),
> > +	HNS3_NETDEV_STAT("rx_bytes", rx_bytes),
> > +	HNS3_NETDEV_STAT("tx_bytes", tx_bytes),
> > +	HNS3_NETDEV_STAT("rx_errors", rx_errors),
> > +	HNS3_NETDEV_STAT("tx_errors", tx_errors),
> > +	HNS3_NETDEV_STAT("rx_dropped", rx_dropped),
> > +	HNS3_NETDEV_STAT("tx_dropped", tx_dropped),
> > +	HNS3_NETDEV_STAT("multicast", multicast),
> > +	HNS3_NETDEV_STAT("collisions", collisions),
> > +
> > +	/* detailed Rx errors */
> > +	HNS3_NETDEV_STAT("rx_length_errors", rx_length_errors),
> > +	HNS3_NETDEV_STAT("rx_over_errors", rx_over_errors),
> > +	HNS3_NETDEV_STAT("rx_crc_errors", rx_crc_errors),
> > +	HNS3_NETDEV_STAT("rx_frame_errors", rx_frame_errors),
> > +	HNS3_NETDEV_STAT("rx_fifo_errors", rx_fifo_errors),
> > +	HNS3_NETDEV_STAT("rx_missed_errors", rx_missed_errors),
> > +
> > +	/* detailed Tx errors */
> > +	HNS3_NETDEV_STAT("tx_aborted_errors", tx_aborted_errors),
> > +	HNS3_NETDEV_STAT("tx_carrier_errors", tx_carrier_errors),
> > +	HNS3_NETDEV_STAT("tx_fifo_errors", tx_fifo_errors),
> > +	HNS3_NETDEV_STAT("tx_heartbeat_errors", tx_heartbeat_errors),
> > +	HNS3_NETDEV_STAT("tx_window_errors", tx_window_errors),
> > +
> > +	/* for cslip etc */
> > +	HNS3_NETDEV_STAT("rx_compressed", rx_compressed),
> > +	HNS3_NETDEV_STAT("tx_compressed", tx_compressed),
> > +};
> > +
> > +#define HNS3_NETDEV_STATS_COUNT ARRAY_SIZE(hns3_netdev_stats)
> > +
> > +/* tqp related stats */
> > +#define HNS3_TQP_STAT(_string, _member)				\
> > +	{ _string,						\
> > +	  FIELD_SIZEOF(struct ring_stats, _member),		\
> > +	  offsetof(struct hns3_enet_ring, stats),	\
> > +	}
> > +
> 
> Same here.
Ok.
> 
> > +static const struct hns3_stats hns3_txq_stats[] = {
> > +	/* Tx per-queue statistics */
> > +	HNS3_TQP_STAT("tx_io_err_cnt", io_err_cnt),
> > +	HNS3_TQP_STAT("tx_sw_err_cnt", sw_err_cnt),
> > +	HNS3_TQP_STAT("tx_seg_pkt_cnt", seg_pkt_cnt),
> > +	HNS3_TQP_STAT("tx_pkts", tx_pkts),
> > +	HNS3_TQP_STAT("tx_bytes", tx_bytes),
> > +	HNS3_TQP_STAT("tx_err_cnt", tx_err_cnt),
> > +	HNS3_TQP_STAT("tx_restart_queue", restart_queue),
> > +	HNS3_TQP_STAT("tx_busy", tx_busy),
> > +};
> > +
> > +#define HNS3_TXQ_STATS_COUNT ARRAY_SIZE(hns3_txq_stats)
> > +
> > +static const struct hns3_stats hns3_rxq_stats[] = {
> > +	/* Rx per-queue statistics */
> > +	HNS3_TQP_STAT("rx_io_err_cnt", io_err_cnt),
> > +	HNS3_TQP_STAT("rx_sw_err_cnt", sw_err_cnt),
> > +	HNS3_TQP_STAT("rx_seg_pkt_cnt", seg_pkt_cnt),
> > +	HNS3_TQP_STAT("rx_pkts", rx_pkts),
> > +	HNS3_TQP_STAT("rx_bytes", rx_bytes),
> > +	HNS3_TQP_STAT("rx_err_cnt", rx_err_cnt),
> > +	HNS3_TQP_STAT("rx_reuse_pg_cnt", reuse_pg_cnt),
> > +	HNS3_TQP_STAT("rx_err_pkt_len", err_pkt_len),
> > +	HNS3_TQP_STAT("rx_non_vld_descs", non_vld_descs),
> > +	HNS3_TQP_STAT("rx_err_bd_num", err_bd_num),
> > +	HNS3_TQP_STAT("rx_l2_err", l2_err),
> > +	HNS3_TQP_STAT("rx_l3l4_csum_err", l3l4_csum_err),
> > +};
> > +
> > +#define HNS3_RXQ_STATS_COUNT ARRAY_SIZE(hns3_rxq_stats)
> > +
> > +#define HNS3_TQP_STATS_COUNT (HNS3_TXQ_STATS_COUNT +
> HNS3_RXQ_STATS_COUNT)
> > +
> > +struct hns3_link_mode_mapping {
> > +	u32 hns3_link_mode;
> > +	u32 ethtool_link_mode;
> > +};
> > +
> > +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},
> > +};
> > +
> > +#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); \
> > +	}							\
> > +}
> 
> How about making this an inline function such that you would get proper
> type checking?
Sure will try doing that.

Thanks
> 
> > +
> > +static int hns3_get_sset_count(struct net_device *netdev, int
> stringset)
> > +{
> > +	struct hns3_nic_priv *priv = netdev_priv(netdev);
> > +	struct hnae3_handle *h = priv->ae_handle;
> > +	const struct hnae3_ae_ops *ops = h->ae_algo->ops;
> > +
> > +	if (!ops->get_sset_count) {
> > +		netdev_err(netdev, "could not get string set count\n");
> > +		return -EOPNOTSUPP;
> > +	}
> 
> Is it really worth the error message? This might be called several
> times
> during the driver's lifecycle.
Fine, will remove.

> 
> > +
> > +	switch (stringset) {
> > +	case ETH_SS_STATS:
> > +		return (HNS3_NETDEV_STATS_COUNT +
> > +			(HNS3_TQP_STATS_COUNT * h->kinfo.num_tqps) +
> > +			ops->get_sset_count(h, stringset));
> > +
> > +	case ETH_SS_TEST:
> > +		return ops->get_sset_count(h, stringset);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static u8 *hns3_get_strings_netdev(u8 *data)
> > +{
> > +	int i;
> 
> unsigned int i.
Ok.

> 
> > +
> > +	for (i = 0; i < HNS3_NETDEV_STATS_COUNT; i++) {
> > +		memcpy(data, hns3_netdev_stats[i].stats_string,
> > +		       ETH_GSTRING_LEN);
> > +		data += ETH_GSTRING_LEN;
> > +	}
> > +
> > +	return data;
> > +}
> > +
> > +static u8 *hns3_get_strings_tqps(struct hnae3_handle *handle, u8
> *data)
> > +{
> > +	struct hnae3_knic_private_info *kinfo = &handle->kinfo;
> > +	int i, j;
> 
> Likewise, unsigned int i, j.
Ok.

> 
> > +
> > +	/* get strings for Tx */
> > +	for (i = 0; i < kinfo->num_tqps; i++) {
> > +		for (j = 0; j < HNS3_TXQ_STATS_COUNT; j++) {
> > +			u8 gstr[ETH_GSTRING_LEN];
> 
> char gstr[ETH_GSTRING_LEN] and you can move it out of the loop since it
> is just a temporary buffer for both loops here.
Fine.

> 
> > +
> > +			sprintf(gstr, "rcb_q%d_", i);
> 
> snprintf() just to be on the safe side.
> 
> > +			strcat(gstr, hns3_txq_stats[j].stats_string);
> > +
> > +			memcpy(data, gstr, ETH_GSTRING_LEN);
> 
> What ensures that you are NULL terminating this string?
Yes, point! Will fix this.

Thanks
> 
> > +			data += ETH_GSTRING_LEN;
> > +		}
> > +	}
> > +
> > +	/* get strings for Rx */
> > +	for (i = 0; i < kinfo->num_tqps; i++) {
> > +		for (j = 0; j < HNS3_RXQ_STATS_COUNT; j++) {
> > +			u8 gstr[ETH_GSTRING_LEN];
> > +
> > +			sprintf(gstr, "rcb_q%d_", i);
> > +			strcat(gstr, hns3_rxq_stats[j].stats_string);
> > +
> > +			memcpy(data, gstr, ETH_GSTRING_LEN);
> > +			data += ETH_GSTRING_LEN;
> > +		}
> > +	}
> > +
> > +	return data;
> > +}
> > +
> > +static void hns3_get_strings(struct net_device *netdev, u32
> stringset, u8 *data)
> > +{
> > +	struct hns3_nic_priv *priv = netdev_priv(netdev);
> > +	struct hnae3_handle *h = priv->ae_handle;
> > +	const struct hnae3_ae_ops *ops = h->ae_algo->ops;
> > +	char *buff = (char *)data;
> > +
> > +	if (!ops->get_strings) {
> > +		netdev_err(netdev, "could not get strings!\n");
> > +		return;
> > +	}
> 
> Same here, does not sound like something you would want to print more
> than once?
Sure. Will remove.

> 
> > +
> > +	switch (stringset) {
> > +	case ETH_SS_STATS:
> > +		buff = hns3_get_strings_netdev(buff);
> > +		buff = hns3_get_strings_tqps(h, buff);
> > +		h->ae_algo->ops->get_strings(h, stringset, (u8 *)buff);
> > +		break;
> > +	case ETH_SS_TEST:
> > +		ops->get_strings(h, stringset, data);
> > +		break;
> > +	}
> > +}
> > +
> > +static u64 *hns3_get_stats_netdev(struct net_device *netdev, u64
> *data)
> > +{
> 
> You should implement the 64-bit version of this.
This is already taking care of 64bit stats?
> 
> > +	const struct rtnl_link_stats64 *net_stats;
> > +	struct rtnl_link_stats64 temp;
> > +	u8 *stat;
> > +	int i;
> 
> unsigned int i
Ok.
> 
> > +
> > +	net_stats = dev_get_stats(netdev, &temp);
> > +
> > +	for (i = 0; i < HNS3_NETDEV_STATS_COUNT; i++) {
> > +		stat = (u8 *)net_stats + hns3_netdev_stats[i].stats_offset;
> > +		*data++ = *(u64 *)stat;
> > +	}
> > +
> > +	return data;
> > +}
> > +
> > +static u64 *hns3_get_stats_tqps(struct hnae3_handle *handle, u64
> *data)
> > +{
> > +	struct hns3_nic_priv *nic_priv = (struct hns3_nic_priv *)handle-
> >priv;
> > +	struct hnae3_knic_private_info *kinfo = &handle->kinfo;
> > +	struct hns3_enet_ring *ring;
> > +	u8 *stat;
> > +	int i;
> 
> Same here.
Ok.

> 
> > +
> > +	/* get stats for Tx */
> > +	for (i = 0; i < kinfo->num_tqps; i++) {
> > +		ring = nic_priv->ring_data[i].ring;
> > +		for (i = 0; i < HNS3_TXQ_STATS_COUNT; i++) {
> > +			stat = (u8 *)ring + hns3_txq_stats[i].stats_offset;
> > +			*data++ = *(u64 *)stat;
> > +		}
> > +	}
> > +
> > +	/* get stats for Rx */
> > +	for (i = 0; i < kinfo->num_tqps; i++) {
> > +		ring = nic_priv->ring_data[i + kinfo->num_tqps].ring;
> > +		for (i = 0; i < HNS3_RXQ_STATS_COUNT; i++) {
> > +			stat = (u8 *)ring + hns3_rxq_stats[i].stats_offset;
> > +			*data++ = *(u64 *)stat;
> > +		}
> > +	}
> > +
> > +	return data;
> > +}
> > +
> > +/* hns3_get_stats - get detail statistics.
> > + * @netdev: net device
> > + * @stats: statistics info.
> > + * @data: statistics data.
> > + */
> > +void hns3_get_stats(struct net_device *netdev, struct ethtool_stats
> *stats,
> > +		    u64 *data)
> > +{
> > +	struct hns3_nic_priv *priv = netdev_priv(netdev);
> > +	struct hnae3_handle *h = priv->ae_handle;
> > +	u64 *p = data;
> > +
> > +	if (!h->ae_algo->ops->get_stats || !h->ae_algo->ops-
> >update_stats) {
> > +		netdev_err(netdev, "could not get any statistics\n");
> > +		return;
> > +	}
> > +
> > +	h->ae_algo->ops->update_stats(h, &netdev->stats);
> > +
> > +	/* get netdev related stats */
> > +	p = hns3_get_stats_netdev(netdev, p);
> > +
> > +	/* get per-queue stats */
> > +	p = hns3_get_stats_tqps(h, p);
> > +
> > +	/* get MAC & other misc hardware stats */
> > +	h->ae_algo->ops->get_stats(h, p);
> > +}
> > +
> > +static void hns3_get_drvinfo(struct net_device *netdev,
> > +			     struct ethtool_drvinfo *drvinfo)
> > +{
> > +	struct hns3_nic_priv *priv = netdev_priv(netdev);
> > +	struct hnae3_handle *h = priv->ae_handle;
> > +
> > +	strncpy(drvinfo->version, HNAE_DRIVER_VERSION,
> > +		sizeof(drvinfo->version));
> > +	drvinfo->version[sizeof(drvinfo->version) - 1] = '\0';
> 
> strlcpy() would probably do that for you.
Not changing this for now.


> 
> > +
> > +	strncpy(drvinfo->driver, HNAE_DRIVER_NAME, sizeof(drvinfo-
> >driver));
> > +	drvinfo->driver[sizeof(drvinfo->driver) - 1] = '\0';
> 
> Same here
> 
> > +
> > +	strncpy(drvinfo->bus_info, priv->dev->bus->name,
> > +		sizeof(drvinfo->bus_info));> +	drvinfo-
> >bus_info[ETHTOOL_BUSINFO_LEN - 1] = '\0';
> 
> And here.
> 
> The rest looked fine.
Sure thanks

> --
> Florian

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