linux-kernel - Re: [PATCH net-next v7 01/10] net: psample: add user cookie

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Date: Mon, 01 Jul 2024 14:05:46 -0400
From: Aaron Conole <aconole@...hat.com>
To: Adrian Moreno <amorenoz@...hat.com>
Cc: netdev@...r.kernel.org,  echaudro@...hat.com,  horms@...nel.org,
  i.maximets@....org,  dev@...nvswitch.org,  Ido Schimmel
 <idosch@...dia.com>,  Yotam Gigi <yotam.gi@...il.com>,  "David S. Miller"
 <davem@...emloft.net>,  Eric Dumazet <edumazet@...gle.com>,  Jakub
 Kicinski <kuba@...nel.org>,  Paolo Abeni <pabeni@...hat.com>,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v7 01/10] net: psample: add user cookie

Adrian Moreno <amorenoz@...hat.com> writes:

> Add a user cookie to the sample metadata so that sample emitters can
> provide more contextual information to samples.
>
> If present, send the user cookie in a new attribute:
> PSAMPLE_ATTR_USER_COOKIE.
>
> Acked-by: Eelco Chaudron <echaudro@...hat.com>
> Reviewed-by: Simon Horman <horms@...nel.org>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> Signed-off-by: Adrian Moreno <amorenoz@...hat.com>
> ---

Reviewed-by: Aaron Conole <aconole@...hat.com>

>  include/net/psample.h        | 2 ++
>  include/uapi/linux/psample.h | 1 +
>  net/psample/psample.c        | 9 ++++++++-
>  3 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/psample.h b/include/net/psample.h
> index 0509d2d6be67..2ac71260a546 100644
> --- a/include/net/psample.h
> +++ b/include/net/psample.h
> @@ -25,6 +25,8 @@ struct psample_metadata {
>  	   out_tc_occ_valid:1,
>  	   latency_valid:1,
>  	   unused:5;
> +	const u8 *user_cookie;
> +	u32 user_cookie_len;
>  };
>  
>  struct psample_group *psample_group_get(struct net *net, u32 group_num);
> diff --git a/include/uapi/linux/psample.h b/include/uapi/linux/psample.h
> index e585db5bf2d2..e80637e1d97b 100644
> --- a/include/uapi/linux/psample.h
> +++ b/include/uapi/linux/psample.h
> @@ -19,6 +19,7 @@ enum {
>  	PSAMPLE_ATTR_LATENCY,		/* u64, nanoseconds */
>  	PSAMPLE_ATTR_TIMESTAMP,		/* u64, nanoseconds */
>  	PSAMPLE_ATTR_PROTO,		/* u16 */
> +	PSAMPLE_ATTR_USER_COOKIE,	/* binary, user provided data */
>  
>  	__PSAMPLE_ATTR_MAX
>  };
> diff --git a/net/psample/psample.c b/net/psample/psample.c
> index a5d9b8446f77..b37488f426bc 100644
> --- a/net/psample/psample.c
> +++ b/net/psample/psample.c
> @@ -386,7 +386,9 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb,
>  		   nla_total_size(sizeof(u32)) +	/* group_num */
>  		   nla_total_size(sizeof(u32)) +	/* seq */
>  		   nla_total_size_64bit(sizeof(u64)) +	/* timestamp */
> -		   nla_total_size(sizeof(u16));		/* protocol */
> +		   nla_total_size(sizeof(u16)) +	/* protocol */
> +		   (md->user_cookie_len ?
> +		    nla_total_size(md->user_cookie_len) : 0); /* user cookie */
>  
>  #ifdef CONFIG_INET
>  	tun_info = skb_tunnel_info(skb);
> @@ -486,6 +488,11 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb,
>  	}
>  #endif
>  
> +	if (md->user_cookie && md->user_cookie_len &&
> +	    nla_put(nl_skb, PSAMPLE_ATTR_USER_COOKIE, md->user_cookie_len,
> +		    md->user_cookie))
> +		goto error;
> +
>  	genlmsg_end(nl_skb, data);
>  	genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0,
>  				PSAMPLE_NL_MCGRP_SAMPLE, GFP_ATOMIC);