From 586e6028371764452b7dbae3b1f50adde87be80e Mon Sep 17 00:00:00 2001
From: Jiawen Wu <jiawenwu@trustnetic.com>
Date: Thu, 21 Oct 2021 17:50:04 +0800
Subject: [PATCH] net/ngbe: support jumbo frame

Add to support Rx jumbo frames.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 doc/guides/nics/ngbe.rst       | 1 +
 drivers/net/ngbe/ngbe_ethdev.h | 3 +++
 drivers/net/ngbe/ngbe_rxtx.c   | 5 ++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/ngbe.rst b/doc/guides/nics/ngbe.rst
index 6a6ae392438..702a4550418 100644
--- a/doc/guides/nics/ngbe.rst
+++ b/doc/guides/nics/ngbe.rst
@@ -14,6 +14,7 @@ Features
 - Packet type information
 - Checksum offload
 - TSO offload
+- Jumbo frames
 - Link state information
 - Scattered and gather for TX and RX
 
diff --git a/drivers/net/ngbe/ngbe_ethdev.h b/drivers/net/ngbe/ngbe_ethdev.h
index 286cb893d69..b270343a3ee 100644
--- a/drivers/net/ngbe/ngbe_ethdev.h
+++ b/drivers/net/ngbe/ngbe_ethdev.h
@@ -17,6 +17,9 @@
 
 #define NGBE_QUEUE_ITR_INTERVAL_DEFAULT	500 /* 500us */
 
+/* The overhead from MTU to max frame size. */
+#define NGBE_ETH_OVERHEAD (RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN)
+
 #define NGBE_MISC_VEC_ID               RTE_INTR_VEC_ZERO_OFFSET
 #define NGBE_RX_VEC_START              RTE_INTR_VEC_RXTX_OFFSET
 
diff --git a/drivers/net/ngbe/ngbe_rxtx.c b/drivers/net/ngbe/ngbe_rxtx.c
index 6687d58e6a3..48983fedbdc 100644
--- a/drivers/net/ngbe/ngbe_rxtx.c
+++ b/drivers/net/ngbe/ngbe_rxtx.c
@@ -2364,8 +2364,11 @@ ngbe_dev_rx_init(struct rte_eth_dev *dev)
 	hlreg0 &= ~NGBE_SECRXCTL_XDSA;
 	wr32(hw, NGBE_SECRXCTL, hlreg0);
 
+	/*
+	 * Configure jumbo frame support, if any.
+	 */
 	wr32m(hw, NGBE_FRMSZ, NGBE_FRMSZ_MAX_MASK,
-			NGBE_FRMSZ_MAX(NGBE_FRAME_SIZE_DFT));
+		NGBE_FRMSZ_MAX(dev->data->mtu + NGBE_ETH_OVERHEAD));
 
 	/* Setup Rx queues */
 	for (i = 0; i < dev->data->nb_rx_queues; i++) {