[dpdk-dev] [Bug 634] i40e: rte_flow doesn't allow RSS action on IPV4 only

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=634

            Bug ID: 634
           Summary: i40e: rte_flow doesn't allow RSS action on IPV4 only
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: frederic.coiff...@6cure.com
  Target Milestone: ---

Hi,

If I use IPV4+TCP, it works fine :
```
  memset(pattern, 0, sizeof(pattern));
  memset(action, 0, sizeof(action));
  memset(&attr, 0, sizeof(struct rte_flow_attr));

  attr.ingress = 1;

  action_rss = (struct rte_flow_action_rss){
      .types     = ETH_RSS_NONFRAG_IPV4_TCP | ETH_RSS_L3_SRC_ONLY,
      .key_len   = RSS_HASH_KEY_LENGTH,
      .queue_num = 0,
      .key       = default_rss_hash_key,
  };

  pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
  pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
  pattern[2].type = RTE_FLOW_ITEM_TYPE_TCP;
  pattern[3].type = RTE_FLOW_ITEM_TYPE_END;

  action[0].type = RTE_FLOW_ACTION_TYPE_RSS;
  action[0].conf = &action_rss;
  action[1].type = RTE_FLOW_ACTION_TYPE_END;

  res = rte_flow_validate(port_id, &attr, pattern, action, error);
  if (res) {
    LOG_WARNING("rte_flow_validate() fails: %d %s", res, error->message);
    return NULL;
  }
  flow = rte_flow_create(port_id, &attr, pattern, action, error);
  if (!flow) {
    LOG_WARNING("rte_flow_create() fails: %d %s", res, error->message);
    return NULL;
  }
  LOG_DEBUG("rte_flow_create() success");
```

But as my purpose is to compute on IPv4 source for all IPv4 packets, I would
like :
```
  memset(pattern, 0, sizeof(pattern));
  memset(action, 0, sizeof(action));
  memset(&attr, 0, sizeof(struct rte_flow_attr));

  attr.ingress = 1;

  action_rss = (struct rte_flow_action_rss){
      .types     = ETH_RSS_IP | ETH_RSS_L3_SRC_ONLY,
      .key_len   = RSS_HASH_KEY_LENGTH,
      .queue_num = 0,
      .key       = default_rss_hash_key,
  };

  pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
  pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
  pattern[2].type = RTE_FLOW_ITEM_TYPE_END;

  action[0].type = RTE_FLOW_ACTION_TYPE_RSS;
  action[0].conf = &action_rss;
  action[1].type = RTE_FLOW_ACTION_TYPE_END;

  res = rte_flow_validate(port_id, &attr, pattern, action, error);
  if (res) {
    LOG_WARNING("rte_flow_validate() fails: %d %s", res, error->message);
    /// TODO
    exit(-1);
    /// TODO
    return NULL;
  }
  flow = rte_flow_create(port_id, &attr, pattern, action, error);
  if (!flow) {
    LOG_WARNING("rte_flow_create() fails: %d %s", res, error->message);
  }
  LOG_DEBUG("rte_flow_create() success\n");
```

But in this case, I get "multi pctype is not supported" error. And this is true
as I need `ETH_RSS_IPV4`, `ETH_RSS_FRAG_IPV4` and `ETH_RSS_NONFRAG_IPV4_OTHER`.

So, is this a limitation of the current i40e driver ? Is there a different way
to treat all IPv4 packets ? (and later, to treat IPv6 packets in the same way)

Regards,
Frédéric

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