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net: psample: add user cookie

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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.

Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Link: https://patch.msgid.link/20240704085710.353845-2-amorenoz@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Adrian Moreno 2024-07-04 10:56:52 +02:00 committed by Jakub Kicinski
parent 064fbc4e9b
commit 093b0f3665
3 changed files with 11 additions and 1 deletions
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2
include/net/psample.h
View File

@ -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);

1
include/uapi/linux/psample.h
View File

@ -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
};

9
net/psample/psample.c
View File

@ -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);