TODO

Signed-off-by: Geliang Tang <[email protected]>

net/mptcp/bpf.c

@@ -293,7 +293,10 @@ static const struct bpf_func_proto bpf_mptcp_ssk_cast_proto = {
 	.func		= bpf_mptcp_ssk_cast,
 	.gpl_only	= false,
 	.ret_type	= RET_PTR_TO_BTF_ID_OR_NULL,
-	.arg1_type	= ARG_ANYTHING,
+	//ARG_CONST_SIZE_OR_ZERO,
+	//.arg1_type	= ARG_PTR_TO_CTX,
+	//.arg1_type	= ARG_PTR_TO_STACK,
+	.arg1_type	= ARG_PTR_TO_BTF_ID,
 	.ret_btf_id	= &btf_sock_ids[BTF_SOCK_TYPE_SOCK],
 };
 

net/mptcp/protocol.c

@@ -2277,6 +2277,7 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 
 			if (!timeo) {
 				copied = -EAGAIN;
+				pr_info("%s return EAGAIN\n", __func__);
 				break;
 			}
 

tools/testing/selftests/bpf/network_helpers.c

@@ -652,8 +652,8 @@ static void *send_recv_server(void *arg)
 		if (nr_sent == -1 && errno == EINTR)
 			continue;
 		if (nr_sent == -1) {
-			if (errno == EAGAIN)
-				continue;
+			//if (errno == EAGAIN)
+			//	continue;
 			err = -errno;
 			break;
 		}
@@ -703,8 +703,8 @@ int send_recv_data(int lfd, int fd, uint32_t total_bytes, int timeout_ms)
 		if (nr_recv == -1 && errno == EINTR)
 			continue;
 		if (nr_recv == -1) {
-			if (errno == EAGAIN)
-				continue;
+			//if (errno == EAGAIN)
+			//	continue;
 			err = -errno;
 			break;
 		}

tools/testing/selftests/bpf/progs/mptcp_bpf_bytes.c

@@ -21,6 +21,9 @@ int BPF_PROG(trace_mptcp_sched_get_send, struct mptcp_sock *msk)
 	if (!msk->pm.server_side)
 		return 0;
 
+	bytes_sent_1 = 0;
+	bytes_sent_2 = 0;
+
 	mptcp_for_each_subflow(msk, subflow) {
 		struct tcp_sock *tp;
 		struct sock *ssk;