Re: [dpdk-dev] [PATCH v1] net/axgbe: add support for set MTU API

["Somalapuram, Amaranath" <Amaranath.Somalapuram@amd.com>]

[AMD Public Use]

Acked-by: Somalapuram Amaranath <asomalap@amd.com>

-----Original Message-----
From: Nandibasappa, Girish <Girish.Nandibasappa@amd.com>
Sent: Monday, June 1, 2020 8:19 PM
To: dev@dpdk.org
Cc: Somalapuram, Amaranath <Amaranath.Somalapuram@amd.com>
Subject: [PATCH v1] net/axgbe: add support for set MTU API

From: gnandiba <gnandiba@amd.com>

This patch adds support for set_mtu API which can be used to change the Maximum Transmission unit (MTU) from application.

Signed-off-by: gnandiba <gnandiba@amd.com>
---
 drivers/net/axgbe/axgbe_ethdev.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/net/axgbe/axgbe_ethdev.c b/drivers/net/axgbe/axgbe_ethdev.c
index 867058845..cdb1297f5 100644
--- a/drivers/net/axgbe/axgbe_ethdev.c
+++ b/drivers/net/axgbe/axgbe_ethdev.c
@@ -73,6 +73,7 @@ static void axgbe_rxq_info_get(struct rte_eth_dev *dev, uint16_t queue_id,  static void axgbe_txq_info_get(struct rte_eth_dev *dev, uint16_t queue_id,
 struct rte_eth_txq_info *qinfo);
 const uint32_t *axgbe_dev_supported_ptypes_get(struct rte_eth_dev *dev);
+static int axgb_mtu_set(struct rte_eth_dev *dev, uint16_t mtu);

 struct axgbe_xstats {
 char name[RTE_ETH_XSTATS_NAME_SIZE];
@@ -214,6 +215,7 @@ static const struct eth_dev_ops axgbe_eth_dev_ops = {
 .dev_supported_ptypes_get     = axgbe_dev_supported_ptypes_get,
 .rx_descriptor_status         = axgbe_dev_rx_descriptor_status,
 .tx_descriptor_status         = axgbe_dev_tx_descriptor_status,
+.mtu_set= axgb_mtu_set,
 };

 static int axgbe_phy_reset(struct axgbe_port *pdata) @@ -1254,7 +1256,35 @@ axgbe_dev_supported_ptypes_get(struct rte_eth_dev *dev)
 return ptypes;
 return NULL;
 }
-
+static int axgb_mtu_set(struct rte_eth_dev *dev, uint16_t mtu) {
+struct rte_eth_dev_info dev_info;
+struct axgbe_port *pdata = dev->data->dev_private;
+uint32_t frame_size = mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+unsigned int val = 0;
+axgbe_dev_info_get(dev, &dev_info);
+/* check that mtu is within the allowed range */
+if ((mtu < RTE_ETHER_MIN_MTU) || (frame_size > dev_info.max_rx_pktlen))
+return -EINVAL;
+/* mtu setting is forbidden if port is start */
+if (dev->data->dev_started) {
+PMD_DRV_LOG(ERR, "port %d must be stopped before configuration",
+dev->data->port_id);
+return -EBUSY;
+}
+if (frame_size > RTE_ETHER_MAX_LEN) {
+dev->data->dev_conf.rxmode.offloads |=
+DEV_RX_OFFLOAD_JUMBO_FRAME;
+val = 1;
+} else {
+dev->data->dev_conf.rxmode.offloads &=
+~DEV_RX_OFFLOAD_JUMBO_FRAME;
+val = 0;
+}
+AXGMAC_IOWRITE_BITS(pdata, MAC_RCR, JE, val);
+dev->data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+return 0;
+}
 static void axgbe_get_all_hw_features(struct axgbe_port *pdata)  {
 unsigned int mac_hfr0, mac_hfr1, mac_hfr2;
--
2.17.1