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| author | Dimitri Staessens <dimitri@ouroboros.rocks> | 2026-05-08 12:37:47 +0200 |
|---|---|---|
| committer | Sander Vrijders <sander@ouroboros.rocks> | 2026-05-20 08:17:06 +0200 |
| commit | 9b1e5b3ac032449deb47357784b108551702e748 (patch) | |
| tree | 9438312bbf79ab0f2a80d2cfe080d0483aa79238 /cmake/config/ipcp/local.cmake | |
| parent | 86dbd8db9b051c8d1e08071cb8aae180a799427a (diff) | |
| download | ouroboros-9b1e5b3ac032449deb47357784b108551702e748.tar.gz ouroboros-9b1e5b3ac032449deb47357784b108551702e748.zip | |
irmd: Pass MTU from IPCP to process for FRCT
FRCT needs to know the MTU for fragmentation. The MTU is now passed
from the layer serving the flow to the process as part of flow
allocation.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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() |