net/ixgbe: set min and max MTU

This commit sets the min and max supported MTU values for ixgbe devices
via the ixgbe_dev_info_get() function. Min MTU supported is set to
ETHER_MIN_MTU and max MTU is calculated as the max packet length
supported minus the transport overhead. To aid in these calculations
a new MACRO 'IXGBE_ETH_OVERHEAD' has been introduced to consolidate
overhead calculation and avoid duplication.

Signed-off-by: Ian Stokes <ian.stokes@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 97e1021..60da350 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -3748,6 +3748,8 @@ ixgbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
                dev_info->max_vmdq_pools = ETH_16_POOLS;
        else
                dev_info->max_vmdq_pools = ETH_64_POOLS;
+       dev_info->max_mtu =  dev_info->max_rx_pktlen - IXGBE_ETH_OVERHEAD;
+       dev_info->min_mtu = ETHER_MIN_MTU;
        dev_info->vmdq_queue_num = dev_info->max_rx_queues;
        dev_info->rx_queue_offload_capa = ixgbe_get_rx_queue_offloads(dev);
        dev_info->rx_offload_capa = (ixgbe_get_rx_port_offloads(dev) |
@@ -4939,7 +4941,7 @@ ixgbe_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
        uint32_t maxfrs;
        struct ixgbe_hw *hw;
        struct rte_eth_dev_info dev_info;
-       uint32_t frame_size = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
+       uint32_t frame_size = mtu + IXGBE_ETH_OVERHEAD;
        struct rte_eth_dev_data *dev_data = dev->data;
 
        ixgbe_dev_info_get(dev, &dev_info);

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
index 3fec613..d1f61e8 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.h
+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
@@ -101,6 +101,9 @@
 #define IXGBE_5TUPLE_MAX_PRI            7
 #define IXGBE_5TUPLE_MIN_PRI            1
 
+/* The overhead from MTU to max frame size. */
+#define IXGBE_ETH_OVERHEAD (ETHER_HDR_LEN + ETHER_CRC_LEN)
+
 /* bit of VXLAN tunnel type | 7 bits of zeros  | 8 bits of zeros*/
 #define IXGBE_FDIR_VXLAN_TUNNEL_TYPE    0x8000
 /* bit of NVGRE tunnel type | 7 bits of zeros  | 8 bits of zeros*/