[dpdk-dev] [PATCH v1 41/42] net/txgbe: add MTU set operation

[Jiawen Wu]

Add MTU set operation.

Signed-off-by: Jiawen Wu <jiawenwu at trustnetic.com>
---
 drivers/net/txgbe/base/txgbe_type.h |  2 ++
 drivers/net/txgbe/txgbe_ethdev.c    | 41 +++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/net/txgbe/base/txgbe_type.h b/drivers/net/txgbe/base/txgbe_type.h
index fcc44ece8..8d1a3a986 100644
--- a/drivers/net/txgbe/base/txgbe_type.h
+++ b/drivers/net/txgbe/base/txgbe_type.h
@@ -652,6 +652,8 @@ struct txgbe_hw {
 	void IOMEM *isb_mem;
 	u16 nb_rx_queues;
 	u16 nb_tx_queues;
+
+	u32 mode;
 	enum txgbe_link_status {
 		TXGBE_LINK_STATUS_NONE = 0,
 		TXGBE_LINK_STATUS_KX,
diff --git a/drivers/net/txgbe/txgbe_ethdev.c b/drivers/net/txgbe/txgbe_ethdev.c
index a2a8f2726..8a6b7e483 100644
--- a/drivers/net/txgbe/txgbe_ethdev.c
+++ b/drivers/net/txgbe/txgbe_ethdev.c
@@ -2744,6 +2744,46 @@ txgbe_set_default_mac_addr(struct rte_eth_dev *dev, struct rte_ether_addr *addr)
 	return 0;
 }
 
+static int
+txgbe_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+	struct txgbe_hw *hw = TXGBE_DEV_HW(dev);
+	struct rte_eth_dev_info dev_info;
+	uint32_t frame_size = mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+	struct rte_eth_dev_data *dev_data = dev->data;
+	int ret;
+
+	ret = txgbe_dev_info_get(dev, &dev_info);
+	if (ret != 0)
+		return ret;
+
+	/* check that mtu is within the allowed range */
+	if ((mtu < RTE_ETHER_MIN_MTU) || (frame_size > dev_info.max_rx_pktlen))
+		return -EINVAL;
+
+	/* If device is started, refuse mtu that requires the support of
+	 * scattered packets when this feature has not been enabled before.
+	 */
+	if (dev_data->dev_started && !dev_data->scattered_rx &&
+	    (frame_size + 2 * TXGBE_VLAN_TAG_SIZE >
+	     dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM)) {
+		PMD_INIT_LOG(ERR, "Stop port first.");
+		return -EINVAL;
+	}
+
+	/* update max frame size */
+	dev->data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+
+	if (hw->mode)
+		wr32m(hw, TXGBE_FRMSZ, TXGBE_FRMSZ_MAX_MASK,
+			TXGBE_FRAME_SIZE_MAX);
+	else
+		wr32m(hw, TXGBE_FRMSZ, TXGBE_FRMSZ_MAX_MASK,
+			TXGBE_FRMSZ_MAX(dev->data->dev_conf.rxmode.max_rx_pkt_len));
+
+	return 0;
+}
+
 static int
 txgbe_dev_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t queue_id)
 {
@@ -3076,6 +3116,7 @@ static const struct eth_dev_ops txgbe_eth_dev_ops = {
 	.fw_version_get             = txgbe_fw_version_get,
 	.dev_infos_get              = txgbe_dev_info_get,
 	.dev_supported_ptypes_get   = txgbe_dev_supported_ptypes_get,
+	.mtu_set                    = txgbe_dev_mtu_set,
 	.vlan_filter_set            = txgbe_vlan_filter_set,
 	.vlan_tpid_set              = txgbe_vlan_tpid_set,
 	.vlan_offload_set           = txgbe_vlan_offload_set,
-- 
2.18.4