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Message-ID: <f7t34otxa11.fsf@redhat.com>
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);
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