diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/vyos/vpp/config_resource_checks/memory.py | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/python/vyos/vpp/config_resource_checks/memory.py b/python/vyos/vpp/config_resource_checks/memory.py index 855527ff1..44ede3d7d 100644 --- a/python/vyos/vpp/config_resource_checks/memory.py +++ b/python/vyos/vpp/config_resource_checks/memory.py @@ -106,6 +106,22 @@ def buffer_size(settings: dict) -> int: return buffers_memory +def no_multi_seg_fits(max_mtu, data_size) -> bool: + """Whether 'no-multi-seg' can be enabled for the given MTU and buffer size. + + With multi-segment buffers disabled a received frame must fit a single + buffer, so the largest interface MTU plus its L2 framing overhead must fit + within the buffer 'data-size' (T9146). + """ + # Bytes a full L2 frame carries on top of the L3 MTU: Ethernet header (14), + # up to two QinQ VLAN tags (8) and the FCS (4). Matches VPP's DPDK frame + # overhead (RTE_ETHER_HDR_LEN + 2 * RTE_VLAN_HLEN + RTE_ETHER_CRC_LEN) + # https://github.com/FDio/vpp/blob/stable/2506/src/plugins/dpdk/device/init.c + # constants: https://github.com/DPDK/dpdk/blob/main/lib/net/rte_ether.h + l2_frame_overhead = 14 + 8 + 4 + return int(data_size) >= int(max_mtu) + l2_frame_overhead + + def main_heap_page_size(settings: dict) -> int: heap_page_size = settings['resource_allocation']['memory']['main_heap_page_size'] return human_memory_to_bytes(heap_page_size) |