[PATCH 05/15] net/ngbe: add set MTU ops for VF device

[Zaiyu Wang <zaiyuwang@trustnetic.com>]

Support to update MTU for VF device.

Signed-off-by: Zaiyu Wang <zaiyuwang@trustnetic.com>
---
 doc/guides/nics/features/ngbe_vf.ini |  1 +
 drivers/net/ngbe/base/ngbe_type.h    |  1 +
 drivers/net/ngbe/base/ngbe_vf.c      | 24 +++++++++++++++++++
 drivers/net/ngbe/base/ngbe_vf.h      |  1 +
 drivers/net/ngbe/ngbe_ethdev_vf.c    | 36 ++++++++++++++++++++++++++++
 5 files changed, 63 insertions(+)

diff --git a/doc/guides/nics/features/ngbe_vf.ini b/doc/guides/nics/features/ngbe_vf.ini
index aa628dfa97..333f02c854 100644
--- a/doc/guides/nics/features/ngbe_vf.ini
+++ b/doc/guides/nics/features/ngbe_vf.ini
@@ -4,6 +4,7 @@
 ; Refer to default.ini for the full list of available PMD features.
 ;
 [Features]
+MTU update           = Y
 Promiscuous mode     = Y
 Allmulticast mode    = Y
 CRC offload          = P
diff --git a/drivers/net/ngbe/base/ngbe_type.h b/drivers/net/ngbe/base/ngbe_type.h
index 29dcd5f912..f780b92efa 100644
--- a/drivers/net/ngbe/base/ngbe_type.h
+++ b/drivers/net/ngbe/base/ngbe_type.h
@@ -352,6 +352,7 @@ struct ngbe_mac_info {
 	void (*set_vlan_anti_spoofing)(struct ngbe_hw *hw,
 					bool enable, int vf);
 	s32 (*update_xcast_mode)(struct ngbe_hw *hw, int xcast_mode);
+	s32 (*set_rlpml)(struct ngbe_hw *hw, u16 max_size);
 
 	/* Flow Control */
 	s32 (*fc_enable)(struct ngbe_hw *hw);
diff --git a/drivers/net/ngbe/base/ngbe_vf.c b/drivers/net/ngbe/base/ngbe_vf.c
index 918df6f0dc..2d00d5998d 100644
--- a/drivers/net/ngbe/base/ngbe_vf.c
+++ b/drivers/net/ngbe/base/ngbe_vf.c
@@ -228,6 +228,29 @@ s32 ngbevf_update_xcast_mode(struct ngbe_hw *hw, int xcast_mode)
 	return 0;
 }
 
+/**
+ *  ngbevf_rlpml_set_vf - Set the maximum receive packet length
+ *  @hw: pointer to the HW structure
+ *  @max_size: value to assign to max frame size
+ **/
+s32 ngbevf_rlpml_set_vf(struct ngbe_hw *hw, u16 max_size)
+{
+	u32 msgbuf[2];
+	s32 retval;
+
+	msgbuf[0] = NGBE_VF_SET_LPE;
+	msgbuf[1] = max_size;
+
+	retval = ngbevf_write_msg_read_ack(hw, msgbuf, msgbuf, 2);
+	if (retval)
+		return retval;
+	if ((msgbuf[0] & NGBE_VF_SET_LPE) &&
+	    (msgbuf[0] & NGBE_VT_MSGTYPE_NACK))
+		return NGBE_ERR_MBX;
+
+	return 0;
+}
+
 /**
  *  ngbevf_negotiate_api_version - Negotiate supported API version
  *  @hw: pointer to the HW structure
@@ -339,6 +362,7 @@ s32 ngbe_init_ops_vf(struct ngbe_hw *hw)
 	mac->negotiate_api_version = ngbevf_negotiate_api_version;
 
 	mac->update_xcast_mode = ngbevf_update_xcast_mode;
+	mac->set_rlpml = ngbevf_rlpml_set_vf;
 
 	mac->max_tx_queues = 1;
 	mac->max_rx_queues = 1;
diff --git a/drivers/net/ngbe/base/ngbe_vf.h b/drivers/net/ngbe/base/ngbe_vf.h
index 79891e8389..a64de9d332 100644
--- a/drivers/net/ngbe/base/ngbe_vf.h
+++ b/drivers/net/ngbe/base/ngbe_vf.h
@@ -17,6 +17,7 @@ s32 ngbe_start_hw_vf(struct ngbe_hw *hw);
 s32 ngbe_reset_hw_vf(struct ngbe_hw *hw);
 s32 ngbe_stop_hw_vf(struct ngbe_hw *hw);
 s32 ngbevf_update_xcast_mode(struct ngbe_hw *hw, int xcast_mode);
+s32 ngbevf_rlpml_set_vf(struct ngbe_hw *hw, u16 max_size);
 int ngbevf_negotiate_api_version(struct ngbe_hw *hw, int api);
 int ngbevf_get_queues(struct ngbe_hw *hw, unsigned int *num_tcs,
 		       unsigned int *default_tc);
diff --git a/drivers/net/ngbe/ngbe_ethdev_vf.c b/drivers/net/ngbe/ngbe_ethdev_vf.c
index d8ece38b00..5ce0c2df98 100644
--- a/drivers/net/ngbe/ngbe_ethdev_vf.c
+++ b/drivers/net/ngbe/ngbe_ethdev_vf.c
@@ -272,6 +272,41 @@ ngbevf_dev_close(struct rte_eth_dev *dev)
 	return 0;
 }
 
+static int
+ngbevf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
+{
+	struct ngbe_hw *hw;
+	uint32_t max_frame = mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+	struct rte_eth_dev_data *dev_data = dev->data;
+
+	hw = ngbe_dev_hw(dev);
+
+	if (mtu < RTE_ETHER_MIN_MTU ||
+			max_frame > RTE_ETHER_MAX_JUMBO_FRAME_LEN)
+		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 &&
+	    (max_frame + 2 * RTE_VLAN_HLEN >
+	     dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM)) {
+		PMD_INIT_LOG(ERR, "Stop port first.");
+		return -EINVAL;
+	}
+
+	/*
+	 * When supported by the underlying PF driver, use the NGBE_VF_SET_MTU
+	 * request of the version 2.0 of the mailbox API.
+	 * For now, use the NGBE_VF_SET_LPE request of the version 1.0
+	 * of the mailbox API.
+	 */
+	if (ngbevf_rlpml_set_vf(hw, max_frame))
+		return -EINVAL;
+
+	return 0;
+}
+
 static int
 ngbevf_dev_promiscuous_enable(struct rte_eth_dev *dev)
 {
@@ -369,6 +404,7 @@ static const struct eth_dev_ops ngbevf_eth_dev_ops = {
 	.allmulticast_enable  = ngbevf_dev_allmulticast_enable,
 	.allmulticast_disable = ngbevf_dev_allmulticast_disable,
 	.dev_infos_get        = ngbevf_dev_info_get,
+	.mtu_set              = ngbevf_dev_set_mtu,
 };
 
 RTE_PMD_REGISTER_PCI(net_ngbe_vf, rte_ngbevf_pmd);
-- 
2.21.0.windows.1