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odp-util: Add support OVS_ACTION_ATTR_PSAMPLE.

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Add support for parsing and formatting the new action.

Also, flag OVS_ACTION_ATTR_SAMPLE as requiring datapath assistance if it
contains a nested OVS_ACTION_ATTR_PSAMPLE. The reason is that the
sampling rate from the parent "sample" is made available to the nested
"psample" by the kernel.

Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Adrian Moreno
2024-07-13 23:23:38 +02:00
committed by Ilya Maximets
parent d9de6b01c2
commit 1a3bd96b4f
10 changed files with 175 additions and 2 deletions
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25
lib/odp-execute.c
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@@ -818,13 +818,13 @@ requires_datapath_assistance(const struct nlattr *a)
case OVS_ACTION_ATTR_RECIRC:
case OVS_ACTION_ATTR_CT:
case OVS_ACTION_ATTR_METER:
case OVS_ACTION_ATTR_PSAMPLE:
return true;
case OVS_ACTION_ATTR_SET:
case OVS_ACTION_ATTR_SET_MASKED:
case OVS_ACTION_ATTR_PUSH_VLAN:
case OVS_ACTION_ATTR_POP_VLAN:
case OVS_ACTION_ATTR_SAMPLE:
case OVS_ACTION_ATTR_HASH:
case OVS_ACTION_ATTR_PUSH_MPLS:
case OVS_ACTION_ATTR_POP_MPLS:
@@ -841,6 +841,28 @@ requires_datapath_assistance(const struct nlattr *a)
case OVS_ACTION_ATTR_DROP:
return false;
case OVS_ACTION_ATTR_SAMPLE: {
/* Nested "psample" actions rely on the datapath executing the
* parent "sample", storing the probability and making it available
* when the nested "psample" is run. */
const struct nlattr *attr;
unsigned int left;
NL_NESTED_FOR_EACH (attr, left, a) {
if (nl_attr_type(attr) == OVS_SAMPLE_ATTR_ACTIONS) {
const struct nlattr *act;
unsigned int act_left;
NL_NESTED_FOR_EACH (act, act_left, attr) {
if (nl_attr_type(act) == OVS_ACTION_ATTR_PSAMPLE) {
return true;
}
}
}
}
return false;
}
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
@@ -1229,6 +1251,7 @@ odp_execute_actions(void *dp, struct dp_packet_batch *batch, bool steal,
case OVS_ACTION_ATTR_CT:
case OVS_ACTION_ATTR_UNSPEC:
case OVS_ACTION_ATTR_DEC_TTL:
case OVS_ACTION_ATTR_PSAMPLE:
case __OVS_ACTION_ATTR_MAX:
/* The following actions are handled by the scalar implementation. */
case OVS_ACTION_ATTR_POP_VLAN: