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Date:   Tue, 3 Dec 2019 17:11:34 +0200
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     Po Liu <po.liu@....com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "hauke.mehrtens@...el.com" <hauke.mehrtens@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "allison@...utok.net" <allison@...utok.net>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "saeedm@...lanox.com" <saeedm@...lanox.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "alexandru.ardelean@...log.com" <alexandru.ardelean@...log.com>,
        "jiri@...lanox.com" <jiri@...lanox.com>,
        "ayal@...lanox.com" <ayal@...lanox.com>,
        "pablo@...filter.org" <pablo@...filter.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "vinicius.gomes@...el.com" <vinicius.gomes@...el.com>,
        "simon.horman@...ronome.com" <simon.horman@...ronome.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Roy Zang <roy.zang@....com>, Mingkai Hu <mingkai.hu@....com>,
        Jerry Huang <jerry.huang@....com>, Leo Li <leoyang.li@....com>
Subject: Re: [v1,net-next, 1/2] ethtool: add setting frame preemption of
 traffic classes

On Wed, Nov 27, 2019 at 09:59:18AM +0000, Po Liu wrote:

Hi, Po Liu

>IEEE Std 802.1Qbu standard defined the frame preemption of port
>traffic classes. This patch introduce a method to set traffic
>classes preemption. Add a parameter 'preemption' in struct
>ethtool_link_settings. The value will be translated to a binary,
>each bit represent a traffic class. Bit "1" means preemptable
>traffic class. Bit "0" means express traffic class.  MSB represent
>high number traffic class.
>
>If hardware support the frame preemption, driver could set the
>ethernet device with hw_features and features with NETIF_F_PREEMPTION
>when initializing the port driver.
>
>User can check the feature 'tx-preemption' by command 'ethtool -k
>devname'. If hareware set preemption feature. The property would
>be a fixed value 'on' if hardware support the frame preemption.
>Feature would show a fixed value 'off' if hardware don't support
>the frame preemption.
>
>Command 'ethtool devname' and 'ethtool -s devname preemption N'
>would show/set which traffic classes are frame preemptable.
>
>Port driver would implement the frame preemption in the function
>get_link_ksettings() and set_link_ksettings() in the struct ethtool_ops.
>
>Signed-off-by: Po Liu <Po.Liu@....com>
>---
> include/linux/netdev_features.h | 5 ++++-
> include/uapi/linux/ethtool.h    | 5 ++++-
> net/core/ethtool.c              | 1 +
> 3 files changed, 9 insertions(+), 2 deletions(-)
>
>diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
>index 4b19c544c59a..299750a8b414 100644
>--- a/include/linux/netdev_features.h
>+++ b/include/linux/netdev_features.h
>@@ -80,6 +80,7 @@ enum {
>
> 	NETIF_F_GRO_HW_BIT,		/* Hardware Generic receive offload */
> 	NETIF_F_HW_TLS_RECORD_BIT,	/* Offload TLS record */
>+	NETIF_F_HW_PREEMPTION_BIT,	/* Hardware TC frame preemption */
>
> 	/*
> 	 * Add your fresh new feature above and remember to update
>@@ -150,6 +151,7 @@ enum {
> #define NETIF_F_GSO_UDP_L4	__NETIF_F(GSO_UDP_L4)
> #define NETIF_F_HW_TLS_TX	__NETIF_F(HW_TLS_TX)
> #define NETIF_F_HW_TLS_RX	__NETIF_F(HW_TLS_RX)
>+#define NETIF_F_PREEMPTION	__NETIF_F(HW_PREEMPTION)
>
> /* Finds the next feature with the highest number of the range of start till 0.
>  */
>@@ -175,7 +177,8 @@ static inline int find_next_netdev_feature(u64 feature, unsigned long start)
> /* Features valid for ethtool to change */
> /* = all defined minus driver/device-class-related */
> #define NETIF_F_NEVER_CHANGE	(NETIF_F_VLAN_CHALLENGED | \
>-				 NETIF_F_LLTX | NETIF_F_NETNS_LOCAL)
>+				 NETIF_F_LLTX | NETIF_F_NETNS_LOCAL | \
>+				 NETIF_F_PREEMPTION)
>
> /* remember that ((t)1 << t_BITS) is undefined in C99 */
> #define NETIF_F_ETHTOOL_BITS	((__NETIF_F_BIT(NETDEV_FEATURE_COUNT - 1) | \
>diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
>index d4591792f0b4..12ffb34afbfa 100644
>--- a/include/uapi/linux/ethtool.h
>+++ b/include/uapi/linux/ethtool.h
>@@ -1776,6 +1776,8 @@ enum ethtool_reset_flags {
> };
> #define ETH_RESET_SHARED_SHIFT	16
>
>+/* Disable preemtion. */
>+#define PREEMPTION_DISABLE     0x0
>
> /**
>  * struct ethtool_link_settings - link control and status
>@@ -1886,7 +1888,8 @@ struct ethtool_link_settings {
> 	__s8	link_mode_masks_nwords;
> 	__u8	transceiver;
> 	__u8	reserved1[3];
>-	__u32	reserved[7];
>+	__u32	preemption;

Why 32 when only 8 is needed?

>+	__u32	reserved[6];
> 	__u32	link_mode_masks[0];
> 	/* layout of link_mode_masks fields:
> 	 * __u32 map_supported[link_mode_masks_nwords];
>diff --git a/net/core/ethtool.c b/net/core/ethtool.c
>index cd9bc67381b2..6ffcd8a602b8 100644
>--- a/net/core/ethtool.c
>+++ b/net/core/ethtool.c
>@@ -111,6 +111,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
> 	[NETIF_F_HW_TLS_RECORD_BIT] =	"tls-hw-record",
> 	[NETIF_F_HW_TLS_TX_BIT] =	 "tls-hw-tx-offload",
> 	[NETIF_F_HW_TLS_RX_BIT] =	 "tls-hw-rx-offload",
>+	[NETIF_F_HW_PREEMPTION_BIT] =	 "tx-preemption",

What about tx-frame-preempt? or frame-preemption?

> };
>
> static const char
>-- 
>2.17.1
>

-- 
Regards,
Ivan Khoronzhuk

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