Hi Zhu,
> We tried to write a 64k data to rfcomm socket, but it will break
> before sending all of the data out. The problem is in function
> rfcomm_sock_sendmsg() in net/bluetooth/rfcomm/sock.c, it breaks after
> calling sock_alloc_send_skb().
>
> static int rfcomm_sock_sendmsg(...)
> {
> ...
> skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
> msg->msg_flags & MSG_DONTWAIT, &err);
> if (!skb)
> break;
> ...
> }
>
> Looks the send buffer is not adequate. Then I increased the send
> buffer size in function rfcomm_sock_alloc(), build kernel and try
> again, this time the sendmsg can complete sending all the data.
>
> Can we use the setsockopt() method to change the socket's send/receive
> buffer size, just like the usual tcp/ip socket?
yes we can. Send a patch for it and I am going to review it.
Regards
Marcel
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