[dpdk-dev] [PATCH v3 48/56] net/txgbe: add MTU set operation

[Jiawen Wu <jiawenwu@trustnetic.com>]

Add MTU set operation.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
---
 doc/guides/nics/features/txgbe.ini  |  1 +
 drivers/net/txgbe/base/txgbe_type.h |  2 ++
 drivers/net/txgbe/txgbe_ethdev.c    | 41 +++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/doc/guides/nics/features/txgbe.ini b/doc/guides/nics/features/txgbe.ini
index 34f8985d5..13ee26aaa 100644
--- a/doc/guides/nics/features/txgbe.ini
+++ b/doc/guides/nics/features/txgbe.ini
@@ -9,6 +9,7 @@ Link status          = Y
 Link status event    = Y
 Rx interrupt         = Y
 Queue start/stop     = Y
+MTU update           = Y
 Jumbo frame          = Y
 Scattered Rx         = Y
 LRO                  = Y
diff --git a/drivers/net/txgbe/base/txgbe_type.h b/drivers/net/txgbe/base/txgbe_type.h
index d851648de..ac36cb22d 100644
--- a/drivers/net/txgbe/base/txgbe_type.h
+++ b/drivers/net/txgbe/base/txgbe_type.h
@@ -673,6 +673,8 @@ 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 9547938d0..5b0a5e7e7 100644
--- a/drivers/net/txgbe/txgbe_ethdev.c
+++ b/drivers/net/txgbe/txgbe_ethdev.c
@@ -3027,6 +3027,46 @@ 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(frame_size));
+
+	return 0;
+}
+
 static uint32_t
 txgbe_uta_vector(struct txgbe_hw *hw, struct rte_ether_addr *uc_addr)
 {
@@ -3387,6 +3427,7 @@ static const struct eth_dev_ops txgbe_eth_dev_ops = {
 	.xstats_get_names_by_id     = txgbe_dev_xstats_get_names_by_id,
 	.queue_stats_mapping_set    = txgbe_dev_queue_stats_mapping_set,
 	.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