[dpdk-dev] [PATCH v3 2/4] net/af_xdp: specify minimal and maximal MTU

[Xiaolong Ye <xiaolong.ye@intel.com>]

Since AF_XDP pmd doesn't support multi segment, we need to add a valid
check in eth_dev_mtu_set.

Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 5cc643ce2..8430921af 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -351,6 +351,9 @@ eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 	dev_info->max_rx_queues = 1;
 	dev_info->max_tx_queues = 1;
 
+	dev_info->min_mtu = ETHER_MIN_MTU;
+	dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM;
+
 	dev_info->default_rxportconf.nb_queues = 1;
 	dev_info->default_txportconf.nb_queues = 1;
 	dev_info->default_rxportconf.ring_size = ETH_AF_XDP_DFLT_NUM_DESCS;
@@ -654,6 +657,15 @@ eth_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	int ret;
 	int s;
 
+	if (mtu > ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM ||
+			mtu < ETHER_MIN_MTU) {
+		AF_XDP_LOG(ERR, "Unsupported MTU of %d. "
+			"max mtu: %d, min mtu: %d", mtu,
+			ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM,
+			ETHER_MIN_MTU);
+		return -EINVAL;
+	}
+
 	s = socket(PF_INET, SOCK_DGRAM, 0);
 	if (s < 0)
 		return -EINVAL;
-- 
2.17.1