[Intel-wired-lan] [PATCH S30 v3 9/9] ice: allow 3k MTU for XDP
Tony Nguyen
anthony.l.nguyen at intel.com
Thu Oct 24 08:11:25 UTC 2019
From: Maciej Fijalkowski <maciej.fijalkowski at intel.com>
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 at intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen at intel.com>
---
drivers/net/ethernet/intel/ice/ice_main.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index d5f292b17739..5fe0f94eb7f3 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -4765,6 +4765,18 @@ static void ice_rebuild(struct ice_pf *pf, enum ice_reset_req reset_type)
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
* @netdev: network interface device structure
@@ -4786,11 +4798,11 @@ static int ice_change_mtu(struct net_device *netdev, int new_mtu)
}
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) {
netdev_err(netdev, "max MTU for XDP usage is %d\n",
- frame_size);
+ frame_size - ICE_ETH_PKT_HDR_PAD);
return -EINVAL;
}
}
--
2.20.1
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