i40e/i40evf: Add support for padding start of frames
This patch adds padding to the start of frames to make room for headroom
for us to eventually start using build_skb. Right now we guarantee at
least NET_SKB_PAD + NET_IP_ALIGN, however we allocate more space if more is
available. For example on x86 the headroom should be 192 bytes.
On systems that have too large of a cache line size to support storing 1.5K
padding and shared info we default to using 3K buffers and reserve
everything that isn't used for skb_shared_info or the data buffer for
headroom.
Change-ID: I33c641c9a1ea10cf7cc484c2d20985368d2d709a
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 7d00aba..12a930e 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -704,7 +704,8 @@ static void i40evf_configure_rx(struct i40evf_adapter *adapter)
* standard Ethernet mtu. On x86 this gives us enough room
* for shared info and 192 bytes of padding.
*/
- if (netdev->mtu <= ETH_DATA_LEN)
+ if (!I40E_2K_TOO_SMALL_WITH_PADDING &&
+ (netdev->mtu <= ETH_DATA_LEN))
rx_buf_len = I40E_RXBUFFER_1536 - NET_IP_ALIGN;
}
#endif
@@ -712,6 +713,11 @@ static void i40evf_configure_rx(struct i40evf_adapter *adapter)
for (i = 0; i < adapter->num_active_queues; i++) {
adapter->rx_rings[i].tail = hw->hw_addr + I40E_QRX_TAIL1(i);
adapter->rx_rings[i].rx_buf_len = rx_buf_len;
+
+ if (adapter->flags & I40EVF_FLAG_LEGACY_RX)
+ clear_ring_build_skb_enabled(&adapter->rx_rings[i]);
+ else
+ set_ring_build_skb_enabled(&adapter->rx_rings[i]);
}
}