[dpdk-dev] [PATCH v1] net/mlx4: report on supported RSS hash functions

[Ophir Munk <ophirmu@mellanox.com>]

Report on mlx4 supported RSS functions as part of dev_infos_get
callback.
Previous to this commit RSS support was reported as none. Since the
introduction of [1] it is required that all RSS configurations will be
verified.

[1] commit 8863a1fbfc66 ("ethdev: add supported hash function check")

Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
---
 drivers/net/mlx4/mlx4_ethdev.c | 51 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/drivers/net/mlx4/mlx4_ethdev.c b/drivers/net/mlx4/mlx4_ethdev.c
index 9a76670..2a1533c 100644
--- a/drivers/net/mlx4/mlx4_ethdev.c
+++ b/drivers/net/mlx4/mlx4_ethdev.c
@@ -545,6 +545,55 @@ mlx4_mac_addr_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr)
 }
 
 /**
+ * Convert verbs RSS types to their DPDK equivalents.
+ *
+ * This function returns a group of RSS dpdk types given their equivalent group
+ * of verbs types.
+ * For example both source IPv4 and destination IPv4 verbs types are converted
+ * into their equivalent RSS group types. If each of these verbs types existed
+ * exclusively - no conversion would take place.
+ *
+ * @param types
+ *   RSS hash types in verbs format
+ *
+ * @return
+ *   A valid dpdk RSS hash fields supported by mlx4 (may return 0)
+ */
+static uint64_t
+mlx4_ibv_to_dpdk_rss_types(uint64_t types)
+{
+	enum { IPV4, IPV6, TCP, UDP, };
+	const uint64_t in[] = {
+		[IPV4] = IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4,
+		[IPV6] = IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6,
+		[TCP] = IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP,
+		[UDP] = IBV_RX_HASH_SRC_PORT_UDP | IBV_RX_HASH_DST_PORT_UDP,
+	};
+	const uint64_t out[RTE_DIM(in)] = {
+		[IPV4] = (ETH_RSS_IPV4 |
+			  ETH_RSS_FRAG_IPV4 |
+			  ETH_RSS_NONFRAG_IPV4_OTHER),
+		[IPV6] = (ETH_RSS_IPV6 |
+			  ETH_RSS_FRAG_IPV6 |
+			  ETH_RSS_NONFRAG_IPV6_OTHER |
+			  ETH_RSS_IPV6_EX),
+		[TCP] = (ETH_RSS_NONFRAG_IPV4_TCP |
+			 ETH_RSS_NONFRAG_IPV6_TCP |
+			 ETH_RSS_IPV6_TCP_EX),
+		[UDP] = (ETH_RSS_NONFRAG_IPV4_UDP |
+			 ETH_RSS_NONFRAG_IPV6_UDP |
+			 ETH_RSS_IPV6_UDP_EX),
+	};
+	uint64_t conv = 0;
+	unsigned int i;
+
+	for (i = 0; i != RTE_DIM(in); ++i)
+		if ((types & in[i]) == in[i])
+			conv |= out[i];
+	return conv;
+}
+
+/**
  * DPDK callback to get information about the device.
  *
  * @param dev
@@ -587,6 +636,8 @@ mlx4_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info)
 			ETH_LINK_SPEED_20G |
 			ETH_LINK_SPEED_40G |
 			ETH_LINK_SPEED_56G;
+	info->flow_type_rss_offloads = mlx4_ibv_to_dpdk_rss_types(
+			priv->hw_rss_sup);
 }
 
 /**
-- 
2.7.4