[dpdk-dev] [PATCH] i40evf: add set maximum frame size support

[Michael Bieniek <michaelbieniekdpdk@gmail.com>]

This adds the ability to set maximum frame size for an i40e virtual
interface. This patch is based on the i40e physical function maximum
frame size implementation. This was tested on an system configured with
multiple i40e virtual functions. Verified that the MTU was configurable
and that sending packets greater than the configured MTU resulted in a
drop.

Signed-off-by: Michael Bieniek <michaelbieniekdpdk@gmail.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index aa306d6..8477c98 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -158,6 +158,7 @@ i40evf_dev_rx_queue_intr_disable(struct rte_eth_dev *dev, uint16_t queue_id);
 static void i40evf_handle_pf_event(__rte_unused struct rte_eth_dev *dev,
 				   uint8_t *msg,
 				   uint16_t msglen);
+static int i40evf_dev_mtu_set(struct rte_eth_dev *dev, uint16_t);
 
 /* Default hash key buffer for RSS */
 static uint32_t rss_key_default[I40E_VFQF_HKEY_MAX_INDEX + 1];
@@ -225,6 +226,7 @@ static const struct eth_dev_ops i40evf_eth_dev_ops = {
 	.reta_query           = i40evf_dev_rss_reta_query,
 	.rss_hash_update      = i40evf_dev_rss_hash_update,
 	.rss_hash_conf_get    = i40evf_dev_rss_hash_conf_get,
+	.mtu_set              = i40evf_dev_mtu_set,
 };
 
 /*
@@ -2635,3 +2637,34 @@ i40evf_dev_rss_hash_conf_get(struct rte_eth_dev *dev,
 
 	return 0;
 }
+
+static int
+i40evf_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct rte_eth_dev_data *dev_data = dev->data;
+	uint32_t frame_size = mtu + ETHER_HDR_LEN
+			      + ETHER_CRC_LEN + I40E_VLAN_TAG_SIZE;
+	int ret = 0;
+
+	/* check if mtu is within the allowed range */
+	if ((mtu < ETHER_MIN_MTU) || (frame_size > I40E_FRAME_SIZE_MAX))
+		return -EINVAL;
+
+	/* mtu setting is forbidden if port is started */
+	if (dev_data->dev_started) {
+		PMD_DRV_LOG(ERR,
+			    "port %d must be stopped before configuration\n",
+			    dev_data->port_id);
+		return -EBUSY;
+	}
+
+	if (frame_size > ETHER_MAX_LEN)
+		dev_data->dev_conf.rxmode.jumbo_frame = 1;
+	else
+		dev_data->dev_conf.rxmode.jumbo_frame = 0;
+
+	dev_data->dev_conf.rxmode.max_rx_pkt_len = frame_size;
+
+	return ret;
+}
-- 
2.4.11