From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
This works similarly to bt_skb_sendmsg but can split the msg into
multiple skb fragments which is useful for stream sockets.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
---
include/net/bluetooth/bluetooth.h | 35 +++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index f858efcf9f40..96743e6e7a0a 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -446,6 +446,41 @@ static inline struct sk_buff *bt_skb_sendmsg(struct sock *sk,
return skb;
}
+/* Similar to bt_skb_sendmsg but can split the msg into multiple fragments
+ * accourding to the MTU.
+ */
+static inline struct sk_buff *bt_skb_sendmmsg(struct sock *sk,
+ struct msghdr *msg,
+ size_t len, size_t mtu,
+ size_t header, size_t footer)
+{
+ struct sk_buff *skb, **frag;
+ size_t size = min_t(size_t, len, mtu);
+
+ skb = bt_skb_sendmsg(sk, msg, size, header, footer);
+ if (IS_ERR_OR_NULL(skb))
+ return skb;
+
+ len -= size;
+ if (!len)
+ return skb;
+
+ /* Add remaining data over MTU as continuation fragments */
+ frag = &skb_shinfo(skb)->frag_list;
+ while (len) {
+ *frag = bt_skb_sendmsg(sk, msg, size, header, footer);
+ if (IS_ERR_OR_NULL(*frag)) {
+ kfree_skb(skb);
+ return *frag;
+ }
+
+ len -= (*frag)->len;
+ frag = &(*frag)->next;
+ }
+
+ return skb;
+}
+
int bt_to_errno(u16 code);
void hci_sock_set_flag(struct sock *sk, int nr);
--
2.31.1
