On 1/11/23 8:26 AM, Ming Lei wrote: > Hello Guy, > > Per my understanding, a short send on SOCK_STREAM should terminate the > remainder of the SQE chain built by IOSQE_IO_LINK. > > But from my observation, this point isn't true when using io_sendmsg or > io_sendmsg_zc on TCP socket, and the other remainder of the chain still > can be completed after one short send is found. MSG_WAITALL is off. > > For SOCK_STREAM, IOSQE_IO_LINK probably is the only way of io_uring for > sending data correctly in batch. However, it depends on the assumption > of chain termination by short send. That is the intended behavior, maybe there are some cases where it's not being set and req_set_fail() not being called? Do you have a test case that I can try? If not, might be easier if you poke at io_uring/net.c:io_sendmsg(). If we send less than what was asked for and we don't retry, req_set_fail() should be called. -- Jens Axboe
