netdev - Re: [PATCH net-next] net: Make gro complete function to return void

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Date: Tue, 30 May 2023 09:25:30 -0600
From: David Ahern <dsahern@...nel.org>
To: Parav Pandit <parav@...dia.com>, edumazet@...gle.com,
 davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: Make gro complete function to return void

On 5/29/23 7:44 AM, Parav Pandit wrote:
> diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
> index 45dda7889387..88f9b0081ee7 100644
> --- a/net/ipv4/tcp_offload.c
> +++ b/net/ipv4/tcp_offload.c
> @@ -296,7 +296,7 @@ struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb)
>  	return pp;
>  }
>  
> -int tcp_gro_complete(struct sk_buff *skb)
> +void tcp_gro_complete(struct sk_buff *skb)
>  {
>  	struct tcphdr *th = tcp_hdr(skb);
>  
> @@ -311,8 +311,6 @@ int tcp_gro_complete(struct sk_buff *skb)
>  
>  	if (skb->encapsulation)
>  		skb->inner_transport_header = skb->transport_header;
> -
> -	return 0;
>  }
>  EXPORT_SYMBOL(tcp_gro_complete);

tcp_gro_complete seems fairly trivial. Any reason not to make it an
inline and avoid another function call in the datapath?

>  
> @@ -342,7 +340,8 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
>  	if (NAPI_GRO_CB(skb)->is_atomic)
>  		skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;
>  
> -	return tcp_gro_complete(skb);
> +	tcp_gro_complete(skb);
> +	return 0;
>  }
>