On Tue, 8 Jun 2021 at 06:02, Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx> wrote: > > It is quite common for a userpace program to fetch the buffered amount > of data in the rx queue to avoid the read block. Implement the TIOCINQ > ioctl to make the migration to the WWAN port usage smooth. > > Despite the fact that the read call will return no more data than the > size of a first skb in the queue, TIOCINQ returns the entire amount of > buffered data (sum of all queued skbs). This is done to prevent the > breaking of programs that optimize reading, avoiding it if the buffered > amount of data is too small. > > Signed-off-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx> Reviewed-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
