Date:   Wed, 20 Apr 2022 17:54:13 +0800
From:   "shenjian (K)" <shenjian15@...wei.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <andrew@...n.ch>,
        <ecree.xilinx@...il.com>, <hkallweit1@...il.com>,
        <saeed@...nel.org>, <leon@...nel.org>, <netdev@...r.kernel.org>,
        <linuxarm@...neuler.org>, <lipeng321@...wei.com>
Subject: Re: [RFCv6 PATCH net-next 02/19] net: replace general features
 macroes with global netdev_features variables



在 2022/4/19 22:49, Alexander Lobakin 写道:
> From: Jian Shen <shenjian15@...wei.com>
> Date: Tue, 19 Apr 2022 10:21:49 +0800
>
>> There are many netdev_features bits group used in kernel. The definition
>> will be illegal when using feature bit more than 64. Replace these macroes
>> with global netdev_features variables, initialize them when netdev module
>> init.
>>
>> Signed-off-by: Jian Shen <shenjian15@...wei.com>
>> ---
>>   drivers/net/wireguard/device.c  |  10 +-
>>   include/linux/netdev_features.h | 102 +++++++++-----
>>   net/core/Makefile               |   2 +-
>>   net/core/dev.c                  |  87 ++++++++++++
>>   net/core/netdev_features.c      | 241 ++++++++++++++++++++++++++++++++
>>   5 files changed, 400 insertions(+), 42 deletions(-)
>>   create mode 100644 net/core/netdev_features.c
>>
> --- 8< ---
>
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 4d6b57752eee..85bb418e8ef1 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -146,6 +146,7 @@
>>   #include <linux/sctp.h>
>>   #include <net/udp_tunnel.h>
>>   #include <linux/net_namespace.h>
>> +#include <linux/netdev_features_helper.h>
>>   #include <linux/indirect_call_wrapper.h>
>>   #include <net/devlink.h>
>>   #include <linux/pm_runtime.h>
>> @@ -11255,6 +11256,90 @@ static struct pernet_operations __net_initdata default_device_ops = {
>>   	.exit_batch = default_device_exit_batch,
>>   };
>>   
>> +static void netdev_features_init(void)
> It is an initialization function, so it must be marked as __init.
right, I will add it, thanks!

>> +{
>> +	netdev_features_t features;
>> +
>> +	netdev_features_set_array(&netif_f_never_change_feature_set,
>> +				  &netdev_never_change_features);
>> +
>> +	netdev_features_set_array(&netif_f_gso_feature_set_mask,
> I'm not sure it does make sense to have an empty newline between
> each call. I'd leave newlines only between the "regular" blocks
> and the "multi-call" blocks, I mean, stuff like VLAN, GSO and
> @netdev_ethtool_features.
At first, I added empty newline per call for the it used three lines.
Now the new call just use two lines, I will remove some unnecessary
blank lines.

Thanks!

>> +				  &netdev_gso_features_mask);
>> +
>> +	netdev_features_set_array(&netif_f_ip_csum_feature_set,
>> +				  &netdev_ip_csum_features);
>> +
>> +	netdev_features_set_array(&netif_f_csum_feature_set_mask,
>> +				  &netdev_csum_features_mask);
>> +
>> +	netdev_features_set_array(&netif_f_general_tso_feature_set,
>> +				  &netdev_general_tso_features);
>> +
>> +	netdev_features_set_array(&netif_f_all_tso_feature_set,
>> +				  &netdev_all_tso_features);
>> +
>> +	netdev_features_set_array(&netif_f_tso_ecn_feature_set,
>> +				  &netdev_tso_ecn_features);
>> +
>> +	netdev_features_set_array(&netif_f_all_fcoe_feature_set,
>> +				  &netdev_all_fcoe_features);
>> +
>> +	netdev_features_set_array(&netif_f_gso_soft_feature_set,
>> +				  &netdev_gso_software_features);
>> +
>> +	netdev_features_set_array(&netif_f_one_for_all_feature_set,
>> +				  &netdev_one_for_all_features);
>> +
>> +	netdev_features_set_array(&netif_f_all_for_all_feature_set,
>> +				  &netdev_all_for_all_features);
>> +
>> +	netdev_features_set_array(&netif_f_upper_disables_feature_set,
>> +				  &netdev_upper_disable_features);
>> +
>> +	netdev_features_set_array(&netif_f_soft_feature_set,
>> +				  &netdev_soft_features);
>> +
>> +	netdev_features_set_array(&netif_f_soft_off_feature_set,
>> +				  &netdev_soft_off_features);
>> +
>> +	netdev_features_set_array(&netif_f_rx_vlan_feature_set,
>> +				  &netdev_rx_vlan_features);
>> +
>> +	netdev_features_set_array(&netif_f_tx_vlan_feature_set,
>> +				  &netdev_tx_vlan_features);
>> +
>> +	netdev_features_set_array(&netif_f_vlan_filter_feature_set,
>> +				  &netdev_vlan_filter_features);
>> +
>> +	netdev_all_vlan_features = netdev_rx_vlan_features;
>> +	netdev_features_set(&netdev_all_vlan_features, netdev_tx_vlan_features);
>> +	netdev_features_set(&netdev_all_vlan_features,
>> +			    netdev_vlan_filter_features);
>> +
>> +	netdev_features_set_array(&netif_f_ctag_vlan_feature_set,
>> +				  &netdev_ctag_vlan_features);
>> +
>> +	netdev_features_set_array(&netif_f_stag_vlan_feature_set,
>> +				  &netdev_stag_vlan_features);
>> +
>> +	netdev_features_set_array(&netif_f_gso_encap_feature_set,
>> +				  &netdev_gso_encap_all_features);
>> +
>> +	netdev_features_set_array(&netif_f_xfrm_feature_set,
>> +				  &netdev_xfrm_features);
>> +
>> +	netdev_features_set_array(&netif_f_tls_feature_set,
>> +				  &netdev_tls_features);
>> +
>> +	netdev_csum_gso_features_mask =
>> +		netdev_features_or(netdev_gso_software_features,
>> +				   netdev_csum_features_mask);
>> +
>> +	netdev_features_fill(&features);
>> +	netdev_ethtool_features =
>> +		netdev_features_andnot(features, netdev_never_change_features);
>> +}
>> +
>>   /*
>>    *	Initialize the DEV module. At boot time this walks the device list and
>>    *	unhooks any devices that fail to initialise (normally hardware not
> --- 8< ---
>
>> -- 
>> 2.33.0
> Thanks,
> Al
>
> .
>

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