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net: openvswitch: add psample action

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Add support for a new action: psample.

This action accepts a u32 group id and a variable-length cookie and uses
the psample multicast group to make the packet available for
observability.

The maximum length of the user-defined cookie is set to 16, same as
tc_cookie, to discourage using cookies that will not be offloadable.

Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Reviewed-by: Ilya Maximets <i.maximets@ovn.org>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Link: https://patch.msgid.link/20240704085710.353845-6-amorenoz@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Adrian Moreno
2024-07-04 10:56:56 +02:00
committed by Jakub Kicinski
parent 7b1b2b60c6
commit aae0b82b46
5 changed files with 125 additions and 1 deletions
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include/uapi/linux/openvswitch.h
+28
View File
@@ -914,6 +914,31 @@ struct check_pkt_len_arg {
};
#endif
#define OVS_PSAMPLE_COOKIE_MAX_SIZE 16
/**
* enum ovs_psample_attr - Attributes for %OVS_ACTION_ATTR_PSAMPLE
* action.
*
* @OVS_PSAMPLE_ATTR_GROUP: 32-bit number to identify the source of the
* sample.
* @OVS_PSAMPLE_ATTR_COOKIE: An optional variable-length binary cookie that
* contains user-defined metadata. The maximum length is
* OVS_PSAMPLE_COOKIE_MAX_SIZE bytes.
*
* Sends the packet to the psample multicast group with the specified group and
* cookie. It is possible to combine this action with the
* %OVS_ACTION_ATTR_TRUNC action to limit the size of the sample.
*/
enum ovs_psample_attr {
OVS_PSAMPLE_ATTR_GROUP = 1, /* u32 number. */
OVS_PSAMPLE_ATTR_COOKIE, /* Optional, user specified cookie. */
/* private: */
__OVS_PSAMPLE_ATTR_MAX
};
#define OVS_PSAMPLE_ATTR_MAX (__OVS_PSAMPLE_ATTR_MAX - 1)
/**
* enum ovs_action_attr - Action types.
*
@@ -966,6 +991,8 @@ struct check_pkt_len_arg {
* of l3 tunnel flag in the tun_flags field of OVS_ACTION_ATTR_ADD_MPLS
* argument.
* @OVS_ACTION_ATTR_DROP: Explicit drop action.
* @OVS_ACTION_ATTR_PSAMPLE: Send a sample of the packet to external observers
* via psample.
*
* Only a single header can be set with a single %OVS_ACTION_ATTR_SET. Not all
* fields within a header are modifiable, e.g. the IPv4 protocol and fragment
@@ -1004,6 +1031,7 @@ enum ovs_action_attr {
OVS_ACTION_ATTR_ADD_MPLS, /* struct ovs_action_add_mpls. */
OVS_ACTION_ATTR_DEC_TTL, /* Nested OVS_DEC_TTL_ATTR_*. */
OVS_ACTION_ATTR_DROP, /* u32 error code. */
OVS_ACTION_ATTR_PSAMPLE, /* Nested OVS_PSAMPLE_ATTR_*. */
__OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted
* from userspace. */