umem_config.comp_size = args->txq_size;
umem_config.frame_size =
sizeof (vlib_buffer_t) + vlib_buffer_get_default_data_size (vm);
+ /*
+ * Note about headroom: for some reasons, there seem to be a discrepency
+ * between 0-copy and copy mode:
+ * - 0-copy: XDP_PACKET_HEADROOM will be added to the user headroom
+ * - copy: nothing is added to the user headroom
+ * We privileged 0-copy and set headroom so that frame_headroom +
+ * XDP_PACKET_HEADROOM == sizeof(vlib_buffer_t), ie data will correctly
+ * point to vlib_buffer_t->data for 0-copy. In copy mode, we have to add
+ * XDP_PACKET_HEADROOM to desc offset during refill.
+ */
+ STATIC_ASSERT (sizeof (vlib_buffer_t) >= XDP_PACKET_HEADROOM, "wrong size");
+ umem_config.frame_headroom = sizeof (vlib_buffer_t) - XDP_PACKET_HEADROOM;
umem_config.flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG;
if (xsk_umem__create
(umem, uword_to_pointer (vm->buffer_main->buffer_mem_start, void *),
sw = vnet_get_hw_sw_interface (vnm, ad->hw_if_index);
hw = vnet_get_hw_interface (vnm, ad->hw_if_index);
args->sw_if_index = ad->sw_if_index = sw->sw_if_index;
- hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+ hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_INT_MODE;
vnet_hw_if_set_input_node (vnm, ad->hw_if_index, af_xdp_input_node.index);