[PATCH v4 2/2] app/testpmd: add random item support

[Michael Baum]

Add support for random item, usage example:

        pattern random spec value 0x1 mask value 0x3 / eth / end

Flow rule with above pattern matching 25% of the traffic, it hits only
when random value suffix is "01" and miss the others ("00", "10", "11").

Signed-off-by: Michael Baum <michae...@nvidia.com>
Reviewed-by: Dariusz Sosnowski <dsosnow...@nvidia.com>
Acked-by: Ori Kam <or...@nvidia.com>
---
 app/test-pmd/cmdline_flow.c                 | 28 +++++++++++++++++++++
 doc/guides/testpmd_app_ug/testpmd_funcs.rst |  4 +++
 2 files changed, 32 insertions(+)

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index ce71818705..359c187b3c 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -433,6 +433,8 @@ enum index {
        ITEM_ICMP6_ND_OPT_TLA_ETH_TLA,
        ITEM_META,
        ITEM_META_DATA,
+       ITEM_RANDOM,
+       ITEM_RANDOM_VALUE,
        ITEM_GRE_KEY,
        ITEM_GRE_KEY_VALUE,
        ITEM_GRE_OPTION,
@@ -956,6 +958,7 @@ static const char *const modify_field_ids[] = {
        "hash_result",
        "geneve_opt_type", "geneve_opt_class", "geneve_opt_data", "mpls",
        "tcp_data_off", "ipv4_ihl", "ipv4_total_len", "ipv6_payload_len",
+       "random",
        NULL
 };
 
@@ -1562,6 +1565,7 @@ static const enum index next_item[] = {
        ITEM_ICMP6_ND_OPT_SLA_ETH,
        ITEM_ICMP6_ND_OPT_TLA_ETH,
        ITEM_META,
+       ITEM_RANDOM,
        ITEM_GRE_KEY,
        ITEM_GRE_OPTION,
        ITEM_GTP_PSC,
@@ -1873,6 +1877,12 @@ static const enum index item_meta[] = {
        ZERO,
 };
 
+static const enum index item_random[] = {
+       ITEM_RANDOM_VALUE,
+       ITEM_NEXT,
+       ZERO,
+};
+
 static const enum index item_gtp_psc[] = {
        ITEM_GTP_PSC_QFI,
        ITEM_GTP_PSC_PDU_T,
@@ -5195,6 +5205,21 @@ static const struct token token_list[] = {
                .args = ARGS(ARGS_ENTRY_MASK(struct rte_flow_item_meta,
                                             data, "\xff\xff\xff\xff")),
        },
+       [ITEM_RANDOM] = {
+               .name = "random",
+               .help = "match random value",
+               .priv = PRIV_ITEM(RANDOM, sizeof(struct rte_flow_item_random)),
+               .next = NEXT(item_random),
+               .call = parse_vc,
+       },
+       [ITEM_RANDOM_VALUE] = {
+               .name = "value",
+               .help = "random value",
+               .next = NEXT(item_random, NEXT_ENTRY(COMMON_UNSIGNED),
+                            item_param),
+               .args = ARGS(ARGS_ENTRY_MASK(struct rte_flow_item_random,
+                                            value, "\xff\xff")),
+       },
        [ITEM_GRE_KEY] = {
                .name = "gre_key",
                .help = "match GRE key",
@@ -12883,6 +12908,9 @@ flow_item_default_mask(const struct rte_flow_item *item)
        case RTE_FLOW_ITEM_TYPE_META:
                mask = &rte_flow_item_meta_mask;
                break;
+       case RTE_FLOW_ITEM_TYPE_RANDOM:
+               mask = &rte_flow_item_random_mask;
+               break;
        case RTE_FLOW_ITEM_TYPE_FUZZY:
                mask = &rte_flow_item_fuzzy_mask;
                break;
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst 
b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 447e28e694..0cd1615d9e 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -3756,6 +3756,10 @@ This section lists supported pattern items and their 
attributes, if any.
 
   - ``data {unsigned}``: metadata value.
 
+- ``random``: match application specific random value.
+
+  - ``value {unsigned}``: random value.
+
 - ``gtp_psc``: match GTP PDU extension header with type 0x85.
 
   - ``pdu_type {unsigned}``: PDU type.
-- 
2.25.1