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ice: allow 3k MTU for XDP 

At this point ice driver is able to work on order 1 pages that are split
onto two 3k buffers. Let's reflect that when user is setting new MTU
size and XDP is present on interface.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Maciej Fijalkowski 2019-10-24 01:11:25 -07:00 committed by Jeff Kirsher
parent aaf27254fd
commit 23b44513c3
1 changed files with 14 additions and 2 deletions
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16
drivers/net/ethernet/intel/ice/ice_main.c
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@ -4658,6 +4658,18 @@ clear_recovery:
dev_err(dev, "Rebuild failed, unload and reload driver\n"); dev_err(dev, "Rebuild failed, unload and reload driver\n");
} }
/**
* ice_max_xdp_frame_size - returns the maximum allowed frame size for XDP
* @vsi: Pointer to VSI structure
*/
static int ice_max_xdp_frame_size(struct ice_vsi *vsi)
{
if (PAGE_SIZE >= 8192 || test_bit(ICE_FLAG_LEGACY_RX, vsi->back->flags))
return ICE_RXBUF_2048 - XDP_PACKET_HEADROOM;
else
return ICE_RXBUF_3072;
}
/** /**
* ice_change_mtu - NDO callback to change the MTU * ice_change_mtu - NDO callback to change the MTU
* @netdev: network interface device structure * @netdev: network interface device structure
@ -4678,11 +4690,11 @@ static int ice_change_mtu(struct net_device *netdev, int new_mtu)
} }
if (ice_is_xdp_ena_vsi(vsi)) { if (ice_is_xdp_ena_vsi(vsi)) {
int frame_size = ICE_RXBUF_2048 - XDP_PACKET_HEADROOM; int frame_size = ice_max_xdp_frame_size(vsi);
if (new_mtu + ICE_ETH_PKT_HDR_PAD > frame_size) { if (new_mtu + ICE_ETH_PKT_HDR_PAD > frame_size) {
netdev_err(netdev, "max MTU for XDP usage is %d\n", netdev_err(netdev, "max MTU for XDP usage is %d\n",
frame_size); frame_size - ICE_ETH_PKT_HDR_PAD);
return -EINVAL; return -EINVAL;
} }
} }