Hi Gustavo - On Fri, 22 Jul 2011, Gustavo Padovan wrote:
* Mat Martineau <mathewm@xxxxxxxxxxxxxx> [2011-07-13 10:58:38 -0700]:ERTM reassembly will be more efficient when skbs are linked together rather than copying every incoming data byte. The existing stream recv function assumes skbs are linear, so it needs to know how to handle fragments before reassembly is changed. bt_sock_recvmsg() already handles fragmented skbs. Signed-off-by: Mat Martineau <mathewm@xxxxxxxxxxxxxx> --- net/bluetooth/af_bluetooth.c | 30 ++++++++++++++++++++++++++++-- 1 files changed, 28 insertions(+), 2 deletions(-) diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c index 8add9b4..9a43520 100644 --- a/net/bluetooth/af_bluetooth.c +++ b/net/bluetooth/af_bluetooth.c @@ -349,7 +349,7 @@ int bt_sock_stream_recvmsg(struct kiocb *iocb, struct socket *sock, } chunk = min_t(unsigned int, skb->len, size); - if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { + if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, chunk)) { skb_queue_head(&sk->sk_receive_queue, skb); if (!copied) copied = -EFAULT; @@ -361,7 +361,33 @@ int bt_sock_stream_recvmsg(struct kiocb *iocb, struct socket *sock, sock_recv_ts_and_drops(msg, sk, skb); if (!(flags & MSG_PEEK)) { - skb_pull(skb, chunk); + int skb_len = skb_headlen(skb); + + if (chunk <= skb_len) { + __skb_pull(skb, chunk); + } else { + struct sk_buff *frag; + + __skb_pull(skb, skb_len); + chunk -= skb_len; + + skb_walk_frags(skb, frag) { + if (chunk <= frag->len) { + /* Pulling partial data */ + skb->len -= chunk; + skb->data_len -= chunk; + __skb_pull(frag, chunk); + break; + } else if (frag->len) { + /* Pulling all frag data */ + chunk -= frag->len; + skb->len -= frag->len; + skb->data_len -= frag->len; + __skb_pull(frag, frag->len); + } + } + } +ERTM and Streaming mode can also use SOCK_SEQPACKET, I think you also need to handle this for SOCK_SEQPACKET.
bt_sock_recvmsg() is used with SOCK_SEQPACKET, and it already handles fragmented skbs without any changes. See skb_copy_datagram_iovec(), which is called by bt_sock_recvmsg() to copy the data out of the skb.
-- Mat Martineau Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
