tcp_bpf: update the rmem scheduling for ingress redirection #7904
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When bpf_tcp_ingress() is called, the skmsg is being redirected to the ingress of the destination socket. Therefore, we should charge its receive socket buffer, instead of sending socket buffer. Because sk_rmem_schedule() tests pfmemalloc of skb, we need to introduce a wrapper and call it for skmsg. Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Although we sk_rmem_schedule and add sk_msg to the ingress_msg of sk_redir in bpf_tcp_ingress, we do not update sk_rmem_alloc. As a result, except for the global memory limit, the rmem of sk_redir is nearly unlimited. Thus, add sk_rmem_alloc related logic to limit the recv buffer. Signed-off-by: Zijian Zhang <zijianzhang@bytedance.com>
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Pull request for series with
subject: tcp_bpf: update the rmem scheduling for ingress redirection
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=900001