netdev - Re: [PATCH net-next 1/2] net: port TP_STORE_ADDR_PORTS

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Date: Thu, 29 Feb 2024 00:21:38 -0800
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <bazsi77@...il.com>
CC: <balazs.scheidler@...flow.com>, <netdev@...r.kernel.org>,
	<kuniyu@...zon.com>
Subject: Re: [PATCH net-next 1/2] net: port TP_STORE_ADDR_PORTS_SKB macro to be tcp/udp independent

From: Balazs Scheidler <bazsi77@...il.com>
Date: Thu, 29 Feb 2024 08:37:59 +0100
> This patch moves TP_STORE_ADDR_PORTS_SKB() to a common header and removes
> the TCP specific implementation details.
> 
> Previously the macro assumed the skb passed as an argument is a
> TCP packet, the implementation now uses an argument to the L3 header and

nit: s/L3/L4/


> uses that to extract the source/destination ports, which happen
> to be named the same in "struct tcphdr" and "struct udphdr"
> 
> Signed-off-by: Balazs Scheidler <balazs.scheidler@...flow.com>
> ---
>  include/trace/events/net_probe_common.h | 41 ++++++++++++++++++++++
>  include/trace/events/tcp.h              | 45 ++-----------------------
>  2 files changed, 43 insertions(+), 43 deletions(-)
> 
> diff --git a/include/trace/events/net_probe_common.h b/include/trace/events/net_probe_common.h
> index 3930119cab08..50c083b5687d 100644
> --- a/include/trace/events/net_probe_common.h
> +++ b/include/trace/events/net_probe_common.h
> @@ -41,4 +41,45 @@
>  
>  #endif
>  
> +#define TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb, protoh)		\
> +	do {								\
> +		struct sockaddr_in *v4 = (void *)__entry->saddr;	\
> +									\
> +		v4->sin_family = AF_INET;				\
> +		v4->sin_port = protoh->source;				\
> +		v4->sin_addr.s_addr = ip_hdr(skb)->saddr;		\
> +		v4 = (void *)__entry->daddr;				\
> +		v4->sin_family = AF_INET;				\
> +		v4->sin_port = protoh->dest;				\
> +		v4->sin_addr.s_addr = ip_hdr(skb)->daddr;		\
> +	} while (0)
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +
> +#define TP_STORE_ADDR_PORTS_SKB(__entry, skb, protoh)			\
> +	do {								\
> +		const struct iphdr *iph = ip_hdr(skb);			\
> +									\
> +		if (iph->version == 6) {				\
> +			struct sockaddr_in6 *v6 = (void *)__entry->saddr; \
> +									\
> +			v6->sin6_family = AF_INET6;			\
> +			v6->sin6_port = protoh->source;			\
> +			v6->sin6_addr = ipv6_hdr(skb)->saddr;		\
> +			v6 = (void *)__entry->daddr;			\
> +			v6->sin6_family = AF_INET6;			\
> +			v6->sin6_port = protoh->dest;			\
> +			v6->sin6_addr = ipv6_hdr(skb)->daddr;		\
> +		} else							\
> +			TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb, protoh); \
> +	} while (0)
> +
> +#else
> +
> +#define TP_STORE_ADDR_PORTS_SKB(__entry, skb, protoh)		\
> +	TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb, protoh)
> +
> +#endif
> +
> +
>  #endif
> diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
> index 7b1ddffa3dfc..717f74454c17 100644
> --- a/include/trace/events/tcp.h
> +++ b/include/trace/events/tcp.h
> @@ -295,48 +295,6 @@ TRACE_EVENT(tcp_probe,
>  		  __entry->srtt, __entry->rcv_wnd, __entry->sock_cookie)
>  );
>  
> -#define TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb)			\
> -	do {								\
> -		const struct tcphdr *th = (const struct tcphdr *)skb->data; \
> -		struct sockaddr_in *v4 = (void *)__entry->saddr;	\
> -									\
> -		v4->sin_family = AF_INET;				\
> -		v4->sin_port = th->source;				\
> -		v4->sin_addr.s_addr = ip_hdr(skb)->saddr;		\
> -		v4 = (void *)__entry->daddr;				\
> -		v4->sin_family = AF_INET;				\
> -		v4->sin_port = th->dest;				\
> -		v4->sin_addr.s_addr = ip_hdr(skb)->daddr;		\
> -	} while (0)
> -
> -#if IS_ENABLED(CONFIG_IPV6)
> -
> -#define TP_STORE_ADDR_PORTS_SKB(__entry, skb)				\
> -	do {								\
> -		const struct iphdr *iph = ip_hdr(skb);			\
> -									\
> -		if (iph->version == 6) {				\
> -			const struct tcphdr *th = (const struct tcphdr *)skb->data; \
> -			struct sockaddr_in6 *v6 = (void *)__entry->saddr; \
> -									\
> -			v6->sin6_family = AF_INET6;			\
> -			v6->sin6_port = th->source;			\
> -			v6->sin6_addr = ipv6_hdr(skb)->saddr;		\
> -			v6 = (void *)__entry->daddr;			\
> -			v6->sin6_family = AF_INET6;			\
> -			v6->sin6_port = th->dest;			\
> -			v6->sin6_addr = ipv6_hdr(skb)->daddr;		\
> -		} else							\
> -			TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb);	\
> -	} while (0)
> -
> -#else
> -
> -#define TP_STORE_ADDR_PORTS_SKB(__entry, skb)		\
> -	TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb)
> -
> -#endif
> -
>  /*
>   * tcp event with only skb
>   */
> @@ -353,12 +311,13 @@ DECLARE_EVENT_CLASS(tcp_event_skb,
>  	),
>  
>  	TP_fast_assign(
> +		const struct tcphdr *th = (const struct tcphdr *)skb->data;
>  		__entry->skbaddr = skb;
>  
>  		memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
>  		memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
>  
> -		TP_STORE_ADDR_PORTS_SKB(__entry, skb);
> +		TP_STORE_ADDR_PORTS_SKB(__entry, skb, th);
>  	),
>  
>  	TP_printk("src=%pISpc dest=%pISpc", __entry->saddr, __entry->daddr)
> -- 
> 2.40.1