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Mon, 09 Dec 2024 17:20:45 -0800 (PST) Received: from n191-036-066.byted.org ([139.177.233.178]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4677006d143sm8116521cf.19.2024.12.09.17.20.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Dec 2024 17:20:44 -0800 (PST) From: zijianzhang@bytedance.com To: bpf@vger.kernel.org Cc: john.fastabend@gmail.com, jakub@cloudflare.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, horms@kernel.org, ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, Cong Wang Subject: [PATCH v2 bpf 1/2] tcp_bpf: charge receive socket buffer in bpf_tcp_ingress() Date: Tue, 10 Dec 2024 01:20:38 +0000 Message-Id: <20241210012039.1669389-2-zijianzhang@bytedance.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20241210012039.1669389-1-zijianzhang@bytedance.com> References: <20241210012039.1669389-1-zijianzhang@bytedance.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net From: Cong Wang 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. Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: Cong Wang --- include/net/sock.h | 10 ++++++++-- net/ipv4/tcp_bpf.c | 2 +- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 7464e9f9f47c..c383126f691d 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -1527,7 +1527,7 @@ static inline bool sk_wmem_schedule(struct sock *sk, int size) } static inline bool -sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) +__sk_rmem_schedule(struct sock *sk, int size, bool pfmemalloc) { int delta; @@ -1535,7 +1535,13 @@ sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) return true; delta = size - sk->sk_forward_alloc; return delta <= 0 || __sk_mem_schedule(sk, delta, SK_MEM_RECV) || - skb_pfmemalloc(skb); + pfmemalloc; +} + +static inline bool +sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) +{ + return __sk_rmem_schedule(sk, size, skb_pfmemalloc(skb)); } static inline int sk_unused_reserved_mem(const struct sock *sk) diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c index 99cef92e6290..b21ea634909c 100644 --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -49,7 +49,7 @@ static int bpf_tcp_ingress(struct sock *sk, struct sk_psock *psock, sge = sk_msg_elem(msg, i); size = (apply && apply_bytes < sge->length) ? apply_bytes : sge->length; - if (!sk_wmem_schedule(sk, size)) { + if (!__sk_rmem_schedule(sk, size, false)) { if (!copied) ret = -ENOMEM; break;