[dpdk-dev] [PATCH] net/mlx5: fix RSS expansion pattern

[dpdk-dev] [PATCH] net/mlx5: fix RSS expansion pattern

[Gregory Etelson]

Flow rule pattern may be implicitly expanded by the PMD if the rule
has RSS flow action. The expansion adds network headers to the
original pattern. The new pattern lists all network levels that
participate in the rule RSS action.

The patch fixes expanded pattern for cases when original pattern
included meta items like MARK, TAG, META.

Fixes: c7870bfe09dc ("ethdev: move RSS expansion code to mlx5 driver")

Cc: stable@dpdk.org

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.c | 54 ++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index dbeca571b6..e5e062d09a 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -114,6 +114,30 @@ struct mlx5_flow_expand_rss {
 	} entry[];
 };
 
+static void
+mlx5_dbg__print_pattern(const struct rte_flow_item *item);
+
+static bool
+mlx5_flow_is_rss_expandable_item(const struct rte_flow_item *item)
+{
+	switch (item->type) {
+	case RTE_FLOW_ITEM_TYPE_ETH:
+	case RTE_FLOW_ITEM_TYPE_VLAN:
+	case RTE_FLOW_ITEM_TYPE_IPV4:
+	case RTE_FLOW_ITEM_TYPE_IPV6:
+	case RTE_FLOW_ITEM_TYPE_UDP:
+	case RTE_FLOW_ITEM_TYPE_TCP:
+	case RTE_FLOW_ITEM_TYPE_VXLAN:
+	case RTE_FLOW_ITEM_TYPE_NVGRE:
+	case RTE_FLOW_ITEM_TYPE_GRE:
+	case RTE_FLOW_ITEM_TYPE_GENEVE:
+		return true;
+	default:
+		break;
+	}
+	return false;
+}
+
 static enum rte_flow_item_type
 mlx5_flow_expand_rss_item_complete(const struct rte_flow_item *item)
 {
@@ -273,8 +297,11 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
 		addr = buf->entry[0].pattern;
 	}
 	for (item = pattern; item->type != RTE_FLOW_ITEM_TYPE_END; item++) {
-		if (item->type != RTE_FLOW_ITEM_TYPE_VOID)
-			last_item = item;
+		if (!mlx5_flow_is_rss_expandable_item(item)) {
+			user_pattern_size += sizeof(*item);
+			continue;
+		}
+		last_item = item;
 		for (i = 0; node->next && node->next[i]; ++i) {
 			next = &graph[node->next[i]];
 			if (next->type == item->type)
@@ -6174,6 +6201,10 @@ flow_list_create(struct rte_eth_dev *dev, uint32_t *list,
 					   mlx5_support_expansion, graph_root);
 		MLX5_ASSERT(ret > 0 &&
 		       (unsigned int)ret < sizeof(expand_buffer.buffer));
+		if (rte_log_can_log(mlx5_logtype, RTE_LOG_DEBUG)) {
+			for (i = 0; i < buf->entries; ++i)
+				mlx5_dbg__print_pattern(buf->entry[i].pattern);
+		}
 	} else {
 		buf->entries = 1;
 		buf->entry[0].pattern = (void *)(uintptr_t)items;
@@ -8990,3 +9021,22 @@ mlx5_release_tunnel_hub(__rte_unused struct mlx5_dev_ctx_shared *sh,
 {
 }
 #endif /* HAVE_IBV_FLOW_DV_SUPPORT */
+
+static void
+mlx5_dbg__print_pattern(const struct rte_flow_item *item)
+{
+	int ret;
+	struct rte_flow_error error;
+
+	for (; item->type != RTE_FLOW_ITEM_TYPE_END; item++) {
+		char *item_name;
+		ret = rte_flow_conv(RTE_FLOW_CONV_OP_ITEM_NAME_PTR, &item_name,
+				    sizeof(item_name),
+				    (void *)(uintptr_t)item->type, &error);
+		if (ret > 0)
+			printf("%s ", item_name);
+		else
+			printf("%d\n", (int)item->type);
+	}
+	printf("END\n");
+}
-- 
2.31.1

Re: [dpdk-dev] [PATCH] net/mlx5: fix RSS expansion pattern

[Raslan Darawsheh]

Hi,

> -----Original Message-----
> From: Gregory Etelson <getelson@nvidia.com>
> Sent: Thursday, May 27, 2021 6:20 PM
> To: dev@dpdk.org
> Cc: Gregory Etelson <getelson@nvidia.com>; Matan Azrad
> <matan@nvidia.com>; Ori Kam <orika@nvidia.com>; Raslan Darawsheh
> <rasland@nvidia.com>; stable@dpdk.org; Slava Ovsiienko
> <viacheslavo@nvidia.com>; Shahaf Shuler <shahafs@nvidia.com>; Ferruh
> Yigit <ferruh.yigit@intel.com>; Dekel Peled <dekelp@nvidia.com>
> Subject: [PATCH] net/mlx5: fix RSS expansion pattern
> 
> Flow rule pattern may be implicitly expanded by the PMD if the rule
> has RSS flow action. The expansion adds network headers to the
> original pattern. The new pattern lists all network levels that
> participate in the rule RSS action.
> 
> The patch fixes expanded pattern for cases when original pattern
> included meta items like MARK, TAG, META.
> 
> Fixes: c7870bfe09dc ("ethdev: move RSS expansion code to mlx5 driver")
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Gregory Etelson <getelson@nvidia.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh