[dpdk-dev] [PATCH v4 11/13] net/enetc: enable CRC offload feature

[Gagandeep Singh <G.Singh@nxp.com>]

CRC offload keep feature supported

Signed-off-by: Gagandeep Singh <g.singh@nxp.com>
---
 doc/guides/nics/enetc.rst          |  1 +
 doc/guides/nics/features/enetc.ini |  1 +
 drivers/net/enetc/base/enetc_hw.h  |  1 +
 drivers/net/enetc/enetc.h          |  1 +
 drivers/net/enetc/enetc_ethdev.c   | 20 +++++++++++++++++---
 drivers/net/enetc/enetc_rxtx.c     |  6 ++++--
 6 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/doc/guides/nics/enetc.rst b/doc/guides/nics/enetc.rst
index 26d61f67d..26204601a 100644
--- a/doc/guides/nics/enetc.rst
+++ b/doc/guides/nics/enetc.rst
@@ -52,6 +52,7 @@ ENETC Features
 - Jumbo packets
 - Queue Start/Stop
 - Deferred Queue Start
+- CRC offload
 
 NIC Driver (PMD)
 ~~~~~~~~~~~~~~~~
diff --git a/doc/guides/nics/features/enetc.ini b/doc/guides/nics/features/enetc.ini
index bd901faf4..101dc0a69 100644
--- a/doc/guides/nics/features/enetc.ini
+++ b/doc/guides/nics/features/enetc.ini
@@ -12,6 +12,7 @@ Allmulticast mode    = Y
 MTU update           = Y
 Jumbo frame          = Y
 Queue start/stop     = Y
+CRC offload          = Y
 Linux VFIO           = Y
 ARMv8                = Y
 Usage doc            = Y
diff --git a/drivers/net/enetc/base/enetc_hw.h b/drivers/net/enetc/base/enetc_hw.h
index 2eb1df30e..261ad157a 100644
--- a/drivers/net/enetc/base/enetc_hw.h
+++ b/drivers/net/enetc/base/enetc_hw.h
@@ -97,6 +97,7 @@ enum enetc_bdr_type {TX, RX};
 #define ENETC_PM0_CMD_CFG		0x08008
 #define ENETC_PM0_TX_EN			BIT(0)
 #define ENETC_PM0_RX_EN			BIT(1)
+#define ENETC_PM0_CRC			BIT(6)
 
 #define ENETC_PM0_MAXFRM		0x08014
 #define ENETC_SET_TX_MTU(val)		((val) << 16)
diff --git a/drivers/net/enetc/enetc.h b/drivers/net/enetc/enetc.h
index e494eb8b8..8c830a5c0 100644
--- a/drivers/net/enetc/enetc.h
+++ b/drivers/net/enetc/enetc.h
@@ -69,6 +69,7 @@ struct enetc_bdr {
 		void *tcisr; /* Tx */
 		int next_to_alloc; /* Rx */
 	};
+	uint8_t	crc_len; /* 0 if CRC stripped, 4 otherwise */
 };
 
 /*
diff --git a/drivers/net/enetc/enetc_ethdev.c b/drivers/net/enetc/enetc_ethdev.c
index ff9301e01..ffae8ae25 100644
--- a/drivers/net/enetc/enetc_ethdev.c
+++ b/drivers/net/enetc/enetc_ethdev.c
@@ -162,7 +162,9 @@ enetc_dev_infos_get(struct rte_eth_dev *dev __rte_unused,
 	dev_info->max_rx_queues = MAX_RX_RINGS;
 	dev_info->max_tx_queues = MAX_TX_RINGS;
 	dev_info->max_rx_pktlen = ENETC_MAC_MAXFRM_SIZE;
-	dev_info->rx_offload_capa = DEV_RX_OFFLOAD_JUMBO_FRAME;
+	dev_info->rx_offload_capa =
+		(DEV_RX_OFFLOAD_KEEP_CRC |
+		 DEV_RX_OFFLOAD_JUMBO_FRAME);
 }
 
 static int
@@ -378,6 +380,7 @@ enetc_rx_queue_setup(struct rte_eth_dev *dev,
 	struct rte_eth_dev_data *data =  dev->data;
 	struct enetc_eth_adapter *adapter =
 			ENETC_DEV_PRIVATE(data->dev_private);
+	uint64_t rx_offloads = data->dev_conf.rxmode.offloads;
 
 	PMD_INIT_FUNC_TRACE();
 	if (nb_rx_desc > MAX_BD_COUNT)
@@ -410,6 +413,9 @@ enetc_rx_queue_setup(struct rte_eth_dev *dev,
 			       RTE_ETH_QUEUE_STATE_STOPPED;
 	}
 
+	rx_ring->crc_len = (uint8_t)((rx_offloads & DEV_RX_OFFLOAD_KEEP_CRC) ?
+				     ETHER_CRC_LEN : 0);
+
 	return 0;
 fail:
 	rte_free(rx_ring);
@@ -625,11 +631,11 @@ enetc_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 static int
 enetc_dev_configure(struct rte_eth_dev *dev)
 {
-	struct rte_eth_conf *eth_conf = &dev->data->dev_conf;
-	uint64_t rx_offloads = eth_conf->rxmode.offloads;
 	struct enetc_eth_hw *hw =
 		ENETC_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	struct enetc_hw *enetc_hw = &hw->hw;
+	struct rte_eth_conf *eth_conf = &dev->data->dev_conf;
+	uint64_t rx_offloads = eth_conf->rxmode.offloads;
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -647,6 +653,14 @@ enetc_dev_configure(struct rte_eth_dev *dev)
 		dev->data->mtu = ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN;
 	}
 
+	if (rx_offloads & DEV_RX_OFFLOAD_KEEP_CRC) {
+		int config;
+
+		config = enetc_port_rd(enetc_hw, ENETC_PM0_CMD_CFG);
+		config |= ENETC_PM0_CRC;
+		enetc_port_wr(enetc_hw, ENETC_PM0_CMD_CFG, config);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/net/enetc/enetc_rxtx.c b/drivers/net/enetc/enetc_rxtx.c
index 42f16cab1..4a758d25a 100644
--- a/drivers/net/enetc/enetc_rxtx.c
+++ b/drivers/net/enetc/enetc_rxtx.c
@@ -208,8 +208,10 @@ enetc_clean_rx_ring(struct enetc_bdr *rx_ring,
 		if (!bd_status)
 			break;
 
-		rx_swbd->buffer_addr->pkt_len = rxbd->r.buf_len;
-		rx_swbd->buffer_addr->data_len = rxbd->r.buf_len;
+		rx_swbd->buffer_addr->pkt_len = rxbd->r.buf_len -
+						rx_ring->crc_len;
+		rx_swbd->buffer_addr->data_len = rxbd->r.buf_len -
+						 rx_ring->crc_len;
 		rx_swbd->buffer_addr->hash.rss = rxbd->r.rss_hash;
 		rx_swbd->buffer_addr->ol_flags = 0;
 		enetc_dev_rx_parse(rx_swbd->buffer_addr,
-- 
2.19.1