netdev - Re: [PATCH net-next 1/6] net: add inline function skb_csum_is

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Date:   Tue, 19 Jan 2021 15:35:14 -0800
From:   Shannon Nelson <snelson@...sando.io>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>,
        "linux-sctp @ vger . kernel . org" <linux-sctp@...r.kernel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH net-next 1/6] net: add inline function skb_csum_is_sctp

On 1/19/21 2:23 PM, Alexander Duyck wrote:
> On Fri, Jan 15, 2021 at 10:13 PM Xin Long <lucien.xin@...il.com> wrote:
>> This patch is to define a inline function skb_csum_is_sctp(), and
>> also replace all places where it checks if it's a SCTP CSUM skb.
>> This function would be used later in many networking drivers in
>> the following patches.
>>
>> Suggested-by: Alexander Duyck <alexander.duyck@...il.com>
>> Signed-off-by: Xin Long <lucien.xin@...il.com>
> One minor nit. If you had to resubmit this I might move the ionic
> driver code into a separate patch. However It can probably be accepted
> as is.
>
> Reviewed-by: Alexander Duyck <alexanderduyck@...com>

Alex has a good point - if you repost, please split out the ionic bits 
to a separate patch.

Either way, for ionic:
Acked-by: Shannon Nelson <snelson@...sando.io>


>> ---
>>   drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 2 +-
>>   include/linux/skbuff.h                           | 5 +++++
>>   net/core/dev.c                                   | 2 +-
>>   3 files changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
>> index ac4cd5d..162a1ff 100644
>> --- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
>> @@ -979,7 +979,7 @@ static int ionic_tx_calc_csum(struct ionic_queue *q, struct sk_buff *skb)
>>                  stats->vlan_inserted++;
>>          }
>>
>> -       if (skb->csum_not_inet)
>> +       if (skb_csum_is_sctp(skb))
>>                  stats->crc32_csum++;
>>          else
>>                  stats->csum++;
>> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
>> index c9568cf..46f901a 100644
>> --- a/include/linux/skbuff.h
>> +++ b/include/linux/skbuff.h
>> @@ -4621,6 +4621,11 @@ static inline void skb_reset_redirect(struct sk_buff *skb)
>>   #endif
>>   }
>>
>> +static inline bool skb_csum_is_sctp(struct sk_buff *skb)
>> +{
>> +       return skb->csum_not_inet;
>> +}
>> +
>>   static inline void skb_set_kcov_handle(struct sk_buff *skb,
>>                                         const u64 kcov_handle)
>>   {
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 0a31d4e..bbd306f 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -3617,7 +3617,7 @@ static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
>>   int skb_csum_hwoffload_help(struct sk_buff *skb,
>>                              const netdev_features_t features)
>>   {
>> -       if (unlikely(skb->csum_not_inet))
>> +       if (unlikely(skb_csum_is_sctp(skb)))
>>                  return !!(features & NETIF_F_SCTP_CRC) ? 0 :
>>                          skb_crc32c_csum_help(skb);
>>
>> --
>> 2.1.0
>>