From 5ac13fc9f2876fbbdc4874be443260d58e5cebc9 Mon Sep 17 00:00:00 2001
From: Michal Krawczyk <mk@semihalf.com>
Date: Wed, 12 May 2021 12:13:44 +0200
Subject: [PATCH 65/72] net/ena: indicate Rx RSS hash presence

To make it possible to the app to determine if the hash was calculated
for the packet or not, the PKT_RX_RSS_HASH should be set in the mbuf's
ol_flags.

As the PMD wasn't setting that, the application couldn't check if there
is a hash in a proper way.

The hash is valid only if it's UDP or TCP and the IP packet wasn't
fragmented.

Fixes: e5df9f33db00 ("net/ena: fix passing RSS hash to mbuf")
Cc: stable@dpdk.org

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Igor Chauskin <igorch@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>
---
 drivers/net/ena/ena_ethdev.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 88e85effc4..7acde04af3 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -51,6 +51,8 @@
 
 #define ENA_MIN_RING_DESC	128
 
+#define ENA_PTYPE_HAS_HASH	(RTE_PTYPE_L4_TCP | RTE_PTYPE_L4_UDP)
+
 enum ethtool_stringset {
 	ETH_SS_TEST             = 0,
 	ETH_SS_STATS,
@@ -330,6 +332,11 @@ static inline void ena_rx_mbuf_prepare(struct rte_mbuf *mbuf,
 		else
 			ol_flags |= PKT_RX_L4_CKSUM_GOOD;
 
+	if (likely((packet_type & ENA_PTYPE_HAS_HASH) && !ena_rx_ctx->frag)) {
+		ol_flags |= PKT_RX_RSS_HASH;
+		mbuf->hash.rss = ena_rx_ctx->hash;
+	}
+
 	mbuf->ol_flags = ol_flags;
 	mbuf->packet_type = packet_type;
 }
@@ -1973,6 +1980,8 @@ static int ena_dev_configure(struct rte_eth_dev *dev)
 
 	adapter->state = ENA_ADAPTER_STATE_CONFIG;
 
+	if (dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG)
+		dev->data->dev_conf.rxmode.offloads |= DEV_RX_OFFLOAD_RSS_HASH;
 	dev->data->dev_conf.txmode.offloads |= DEV_TX_OFFLOAD_MULTI_SEGS;
 
 	adapter->tx_selected_offloads = dev->data->dev_conf.txmode.offloads;
@@ -2052,6 +2061,7 @@ static int ena_infos_get(struct rte_eth_dev *dev,
 
 	/* Inform framework about available features */
 	dev_info->rx_offload_capa = rx_feat;
+	dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_RSS_HASH;
 	dev_info->rx_queue_offload_capa = rx_feat;
 	dev_info->tx_offload_capa = tx_feat;
 	dev_info->tx_queue_offload_capa = tx_feat;
@@ -2264,8 +2274,6 @@ static uint16_t eth_ena_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 			++rx_ring->rx_stats.bad_csum;
 		}
 
-		mbuf->hash.rss = ena_rx_ctx.hash;
-
 		rx_pkts[completed] = mbuf;
 		rx_ring->rx_stats.bytes += mbuf->pkt_len;
 	}
-- 
2.25.1

