On Fri, Aug 15, 2025 at 1:40 AM <chia-yu.chang@xxxxxxxxxxxxxxxxxxx> wrote: > > From: Chia-Yu Chang <chia-yu.chang@xxxxxxxxxxxxxxxxxxx> > > AccECN option may fail in various way, handle these: > - Attempt to negotiate the use of AccECN on the 1st retransmitted SYN > - From the 2nd retransmitted SYN, stop AccECN negotiation > - Remove option from SYN/ACK rexmits to handle blackholes > - If no option arrives in SYN/ACK, assume Option is not usable > - If an option arrives later, re-enabled > - If option is zeroed, disable AccECN option processing > > This patch use existing padding bits in tcp_request_sock and > holes in tcp_sock without increasing the size. > > Signed-off-by: Ilpo Järvinen <ij@xxxxxxxxxx> > Signed-off-by: Chia-Yu Chang <chia-yu.chang@xxxxxxxxxxxxxxxxxxx> Truly invasive changes, what can I say.... Not sure why you CC so many folks which will very unlikely give any feedback. What is the purpose of WARN_ON_ONCE() in tcp_accecn_option_init() ? Just to feed syzbot ?
