[dpdk-dev] [PATCH v2 2/5] net/txgbe: fix VF MTU limit setting

[Jiawen Wu]

Add the dev_started check to remove the limitation of VF MTU setting.
When device is stopped, it is allowed to set MTU bigger than mbuf size.
Scattered rx may be enabled in next starting, exempt from setting in
EAL parameters.

Fixes: a2beaa4a769e ("net/txgbe: support VF MTU update")
Cc: stable at dpdk.org

Signed-off-by: Jiawen Wu <jiawenwu at trustnetic.com>
---
 drivers/net/txgbe/txgbe_ethdev_vf.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/txgbe/txgbe_ethdev_vf.c b/drivers/net/txgbe/txgbe_ethdev_vf.c
index 3a5123733e..5597968e18 100644
--- a/drivers/net/txgbe/txgbe_ethdev_vf.c
+++ b/drivers/net/txgbe/txgbe_ethdev_vf.c
@@ -1115,7 +1115,7 @@ 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;
+	struct rte_eth_dev_data *dev_data = dev->data;
 
 	hw = TXGBE_DEV_HW(dev);
 
@@ -1123,13 +1123,15 @@ txgbevf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t 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 device is started, 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) &&
+	if (dev_data->dev_started && !dev_data->scattered_rx &&
 	    (max_frame + 2 * TXGBE_VLAN_TAG_SIZE >
-	     dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM))
+	     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 TXGBE_VF_SET_MTU
-- 
2.21.0.windows.1