diff options
Diffstat (limited to 'cmake/config/ipcp/local.cmake')
| -rw-r--r-- | cmake/config/ipcp/local.cmake | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/cmake/config/ipcp/local.cmake b/cmake/config/ipcp/local.cmake index 88ee8998..60ff23ee 100644 --- a/cmake/config/ipcp/local.cmake +++ b/cmake/config/ipcp/local.cmake @@ -5,5 +5,35 @@ set(IPCP_LOCAL_TARGET ipcpd-local) set(IPCP_LOCAL_MPL 100 CACHE STRING "Default maximum packet lifetime for the Local IPCP, in ms") +set(IPCP_LOCAL_MTU 65000 CACHE STRING + "Layer MTU advertised by the Local IPCP, in bytes") + set(IPCP_LOCAL_POLLING FALSE CACHE BOOL "Enable active polling in the Local IPCP for low-latency mode") + +# IPCP_LOCAL_MTU must fit in the largest enabled GSPP and PUP class +# (sender-side allocation: daemons use GSPP, apps use PUP). Reserve a +# margin for sizeof(struct ssm_pk_buff) + HEADSPACE + TAILSPACE. +math(EXPR _ssm_pk_overhead + "${SSM_PK_BUFF_HEADSPACE} + ${SSM_PK_BUFF_TAILSPACE} + 64") + +foreach(_pool GSPP PUP) + set(_largest 0) + foreach(_pair "256;256" "512;512" "1K;1024" "2K;2048" "4K;4096" + "16K;16384" "64K;65536" "256K;262144" "1M;1048576") + list(GET _pair 0 _name) + list(GET _pair 1 _bytes) + if(SSM_${_pool}_${_name}_BLOCKS GREATER 0 + AND _bytes GREATER _largest) + set(_largest ${_bytes}) + endif() + endforeach() + math(EXPR _avail "${_largest} - ${_ssm_pk_overhead}") + if(IPCP_LOCAL_MTU GREATER _avail) + message(FATAL_ERROR + "IPCP_LOCAL_MTU (${IPCP_LOCAL_MTU}) exceeds largest enabled " + "SSM_${_pool} class minus per-block overhead " + "(${_largest} - ${_ssm_pk_overhead} = ${_avail} bytes). " + "Lower IPCP_LOCAL_MTU or enable a larger SSM_${_pool}_*_BLOCKS.") + endif() +endforeach() |