[dpdk-dev] [PATCH] net/vmxnet3: Added mtu_set() function to allow setting MTU.

["Myers, Charles" <Charles.Myers@spirent.com>]

When the mtu_set() function is not implemented, rte_eth_dev_set_mtu()
fails with -ENOTSUP and mtu is not stored in the mtu field in the
rte_eth_dev_data.  This causes the mtu in Vmxnet3_MiscConf which is
shared with hypervisor to always be set to 1500.

This may cause issues receiving jumbo frames on Enhanced Data Path
N-VDS.

Signed-off-by: Charles Myers <Charles.Myers@spirent.com>
---
 drivers/net/vmxnet3/vmxnet3_ethdev.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
index 57feb37..c32c92d 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
@@ -88,6 +88,7 @@ static void vmxnet3_dev_info_get(struct rte_eth_dev *dev,
 				 struct rte_eth_dev_info *dev_info);
 static const uint32_t *
 vmxnet3_dev_supported_ptypes_get(struct rte_eth_dev *dev);
+static int vmxnet3_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu);
 static int vmxnet3_dev_vlan_filter_set(struct rte_eth_dev *dev,
 				       uint16_t vid, int on);
 static int vmxnet3_dev_vlan_offload_set(struct rte_eth_dev *dev, int mask);
@@ -125,6 +126,7 @@ static const struct eth_dev_ops vmxnet3_eth_dev_ops = {
 	.mac_addr_set         = vmxnet3_mac_addr_set,
 	.dev_infos_get        = vmxnet3_dev_info_get,
 	.dev_supported_ptypes_get = vmxnet3_dev_supported_ptypes_get,
+	.mtu_set              = vmxnet3_dev_mtu_set,
 	.vlan_filter_set      = vmxnet3_dev_vlan_filter_set,
 	.vlan_offload_set     = vmxnet3_dev_vlan_offload_set,
 	.rx_queue_setup       = vmxnet3_dev_rx_queue_setup,
@@ -1161,6 +1163,8 @@ vmxnet3_dev_info_get(struct rte_eth_dev *dev __rte_unused,
 	dev_info->max_tx_queues = VMXNET3_MAX_TX_QUEUES;
 	dev_info->min_rx_bufsize = 1518 + RTE_PKTMBUF_HEADROOM;
 	dev_info->max_rx_pktlen = 16384; /* includes CRC, cf MAXFRS register */
+	dev_info->min_mtu = VMXNET3_MIN_MTU;
+	dev_info->max_mtu = VMXNET3_MAX_MTU;
 	dev_info->speed_capa = ETH_LINK_SPEED_10G;
 	dev_info->max_mac_addrs = VMXNET3_MAX_MAC_ADDRS;
 
@@ -1205,6 +1209,24 @@ vmxnet3_dev_supported_ptypes_get(struct rte_eth_dev *dev)
 }
 
 static int
+vmxnet3_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+	if (mtu < VMXNET3_MIN_MTU || mtu > VMXNET3_MAX_MTU) {
+		PMD_DRV_LOG(ERR, "MTU should be between %d and %d",
+			     VMXNET3_MIN_MTU, VMXNET3_MAX_MTU);
+		return -EINVAL;
+	}
+
+	if (dev->data->dev_started) {
+		PMD_DRV_LOG(ERR, "Port %d must be stopped to configure MTU",
+			    dev->data->port_id);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int
 vmxnet3_mac_addr_set(struct rte_eth_dev *dev, struct rte_ether_addr *mac_addr)
 {
 	struct vmxnet3_hw *hw = dev->data->dev_private;
-- 
2.7.4