From: Martin KaFai Lau <kafai@xxxxxx> Date: Thu, 1 Jul 2021 13:05:35 -0700 > This set is to allow bpf tcp iter to call bpf_(get|set)sockopt. > > With bpf-tcp-cc, new algo rollout happens more often. Instead of > restarting the applications to pick up the new tcp-cc, this set > allows the bpf tcp iter to call bpf_(get|set)sockopt(TCP_CONGESTION). > It is not limited to TCP_CONGESTION, the bpf tcp iter can call > bpf_(get|set)sockopt() with other options. The bpf tcp iter can read > into all the fields of a tcp_sock, so there is a lot of flexibility > to select the desired sk to do setsockopt(), e.g. it can test for > TCP_LISTEN only and leave the established connections untouched, > or check the addr/port, or check the current tcp-cc name, ...etc. > > Patch 1-4 are some cleanup and prep work in the tcp and bpf seq_file. > > Patch 5 is to have the tcp seq_file iterate on the > port+addr lhash2 instead of the port only listening_hash. > > Patch 6 is to have the bpf tcp iter doing batching which > then allows lock_sock. lock_sock is needed for setsockopt. > > Patch 7 allows the bpf tcp iter to call bpf_(get|set)sockopt. I have a comment on the first patch, but the series looks good to me. Acked-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxxxx>
