[dpdk-dev] [PATCH] net/ixgbe: check the result of setting VF MTU

[Zhang,Alvin]

From: Alvin Zhang <alvinx.zhang at intel.com>

If a VF request to set a invalid maximum packet length value,
The PF kernel driver may disable its reception.

This patch add codes to output information and return the error status.

Signed-off-by: Alvin Zhang <alvinx.zhang at intel.com>

Fixes: 12cd0cccc3db ("ixgbevf: allow to set MTU")
Cc: stable at dpdk.org
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 3 ++-
 drivers/net/ixgbe/ixgbe_rxtx.c   | 8 ++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 9a47a8b..d7a1806 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -6555,7 +6555,8 @@ static void ixgbevf_set_vfta_all(struct rte_eth_dev *dev, bool on)
 	 * prior to 3.11.33 which contains the following change:
 	 * "ixgbe: Enable jumbo frames support w/ SR-IOV"
 	 */
-	ixgbevf_rlpml_set_vf(hw, max_frame);
+	if (ixgbevf_rlpml_set_vf(hw, max_frame))
+		return -EINVAL;
 
 	/* update max frame size */
 	dev->data->dev_conf.rxmode.max_rx_pkt_len = max_frame;
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index 6cfbb58..7bb8460 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -5634,8 +5634,12 @@ void ixgbe_configure_dcb(struct rte_eth_dev *dev)
 	 * ixgbevf_rlpml_set_vf even if jumbo frames are not used. This way,
 	 * VF packets received can work in all cases.
 	 */
-	ixgbevf_rlpml_set_vf(hw,
-		(uint16_t)dev->data->dev_conf.rxmode.max_rx_pkt_len);
+	if (ixgbevf_rlpml_set_vf(hw,
+	    (uint16_t)dev->data->dev_conf.rxmode.max_rx_pkt_len)) {
+		PMD_INIT_LOG(ERR, "Set max packet length to %d failed.",
+			     dev->data->dev_conf.rxmode.max_rx_pkt_len);
+		return -EINVAL;
+	}
 
 	/*
 	 * Assume no header split and no VLAN strip support
-- 
1.8.3.1