Commit f9cd6a44 authored by Jason Xing's avatar Jason Xing Committed by Tony Nguyen

ixgbe: allow to increase MTU to 3K with XDP enabled

Recently I encountered one case where I cannot increase the MTU size
directly from 1500 to a much bigger value with XDP enabled if the
server is equipped with IXGBE card, which happened on thousands of
servers in production environment. After applying the current patch,
we can set the maximum MTU size to 3K.

This patch follows the behavior of changing MTU as i40e/ice does.

References:
[1] commit 23b44513 ("ice: allow 3k MTU for XDP")
[2] commit 0c8493d9 ("i40e: add XDP support for pass and drop actions")

Fixes: fabf1bce ("ixgbe: Prevent unsupported configurations with XDP")
Signed-off-by: default avatarJason Xing <kernelxing@tencent.com>
Reviewed-by: default avatarAlexander Duyck <alexanderduyck@fb.com>
Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel)
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 05d7623a
...@@ -6777,6 +6777,18 @@ static void ixgbe_free_all_rx_resources(struct ixgbe_adapter *adapter) ...@@ -6777,6 +6777,18 @@ static void ixgbe_free_all_rx_resources(struct ixgbe_adapter *adapter)
ixgbe_free_rx_resources(adapter->rx_ring[i]); ixgbe_free_rx_resources(adapter->rx_ring[i]);
} }
/**
* ixgbe_max_xdp_frame_size - returns the maximum allowed frame size for XDP
* @adapter: device handle, pointer to adapter
*/
static int ixgbe_max_xdp_frame_size(struct ixgbe_adapter *adapter)
{
if (PAGE_SIZE >= 8192 || adapter->flags2 & IXGBE_FLAG2_RX_LEGACY)
return IXGBE_RXBUFFER_2K;
else
return IXGBE_RXBUFFER_3K;
}
/** /**
* ixgbe_change_mtu - Change the Maximum Transfer Unit * ixgbe_change_mtu - Change the Maximum Transfer Unit
* @netdev: network interface device structure * @netdev: network interface device structure
...@@ -6788,18 +6800,13 @@ static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu) ...@@ -6788,18 +6800,13 @@ static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu)
{ {
struct ixgbe_adapter *adapter = netdev_priv(netdev); struct ixgbe_adapter *adapter = netdev_priv(netdev);
if (adapter->xdp_prog) { if (ixgbe_enabled_xdp_adapter(adapter)) {
int new_frame_size = new_mtu + ETH_HLEN + ETH_FCS_LEN + int new_frame_size = new_mtu + ETH_HLEN + ETH_FCS_LEN +
VLAN_HLEN; VLAN_HLEN;
int i;
for (i = 0; i < adapter->num_rx_queues; i++) {
struct ixgbe_ring *ring = adapter->rx_ring[i];
if (new_frame_size > ixgbe_rx_bufsz(ring)) { if (new_frame_size > ixgbe_max_xdp_frame_size(adapter)) {
e_warn(probe, "Requested MTU size is not supported with XDP\n"); e_warn(probe, "Requested MTU size is not supported with XDP\n");
return -EINVAL; return -EINVAL;
}
} }
} }
......
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