[dpdk-dev] [PATCH v2 13/17] net/txgbe: support to update MTU on VF device

[Jiawen Wu <jiawenwu@trustnetic.com>]

Add MTU set operation for VF device.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 doc/guides/nics/features/txgbe_vf.ini |  1 +
 drivers/net/txgbe/txgbe_ethdev_vf.c   | 36 +++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/doc/guides/nics/features/txgbe_vf.ini b/doc/guides/nics/features/txgbe_vf.ini
index 14040070e..4c072b4a5 100644
--- a/doc/guides/nics/features/txgbe_vf.ini
+++ b/doc/guides/nics/features/txgbe_vf.ini
@@ -6,6 +6,7 @@
 [Features]
 Link status          = Y
 Rx interrupt         = Y
+MTU update           = Y
 Jumbo frame          = Y
 Scattered Rx         = Y
 LRO                  = Y
diff --git a/drivers/net/txgbe/txgbe_ethdev_vf.c b/drivers/net/txgbe/txgbe_ethdev_vf.c
index d5f7b21cd..8839b610d 100644
--- a/drivers/net/txgbe/txgbe_ethdev_vf.c
+++ b/drivers/net/txgbe/txgbe_ethdev_vf.c
@@ -911,6 +911,41 @@ txgbevf_set_default_mac_addr(struct rte_eth_dev *dev,
 	return 0;
 }
 
+static int
+txgbevf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
+{
+	struct txgbe_hw *hw;
+	uint32_t max_frame = mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+	struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
+
+	hw = TXGBE_DEV_HW(dev);
+
+	if (mtu < RTE_ETHER_MIN_MTU ||
+			max_frame > RTE_ETHER_MAX_JUMBO_FRAME_LEN)
+		return -EINVAL;
+
+	/* refuse mtu that requires the support of scattered packets when this
+	 * feature has not been enabled before.
+	 */
+	if (!(rx_conf->offloads & DEV_RX_OFFLOAD_SCATTER) &&
+	    (max_frame + 2 * TXGBE_VLAN_TAG_SIZE >
+	     dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM))
+		return -EINVAL;
+
+	/*
+	 * When supported by the underlying PF driver, use the TXGBE_VF_SET_MTU
+	 * request of the version 2.0 of the mailbox API.
+	 * For now, use the TXGBE_VF_SET_LPE request of the version 1.0
+	 * of the mailbox API.
+	 */
+	if (txgbevf_rlpml_set_vf(hw, max_frame))
+		return -EINVAL;
+
+	/* update max frame size */
+	dev->data->dev_conf.rxmode.max_rx_pkt_len = max_frame;
+	return 0;
+}
+
 static int
 txgbevf_dev_promiscuous_enable(struct rte_eth_dev *dev)
 {
@@ -1074,6 +1109,7 @@ static const struct eth_dev_ops txgbevf_eth_dev_ops = {
 	.allmulticast_enable  = txgbevf_dev_allmulticast_enable,
 	.allmulticast_disable = txgbevf_dev_allmulticast_disable,
 	.dev_infos_get        = txgbevf_dev_info_get,
+	.mtu_set              = txgbevf_dev_set_mtu,
 	.vlan_filter_set      = txgbevf_vlan_filter_set,
 	.vlan_strip_queue_set = txgbevf_vlan_strip_queue_set,
 	.vlan_offload_set     = txgbevf_vlan_offload_set,
-- 
2.27.0