From cb7ed8c7fe5b20091c2297f7d3e2d36ebcd95672 Mon Sep 17 00:00:00 2001 From: Luiz Augusto von Dentz Date: Fri, 3 Sep 2021 15:27:30 -0700 Subject: [PATCH] Bluetooth: Add bt_skb_sendmmsg helper commit 97e4e80299844bb5f6ce5a7540742ffbffae3d97 upstream. 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 Signed-off-by: Marcel Holtmann Cc: Harshit Mogalapalli Signed-off-by: Greg Kroah-Hartman --- include/net/bluetooth/bluetooth.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h index 83eaa42..3275d57 100644 --- a/include/net/bluetooth/bluetooth.h +++ b/include/net/bluetooth/bluetooth.h @@ -450,6 +450,44 @@ 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 headroom, size_t tailroom) +{ + struct sk_buff *skb, **frag; + + skb = bt_skb_sendmsg(sk, msg, len, mtu, headroom, tailroom); + if (IS_ERR_OR_NULL(skb)) + return skb; + + len -= skb->len; + if (!len) + return skb; + + /* Add remaining data over MTU as continuation fragments */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + struct sk_buff *tmp; + + tmp = bt_skb_sendmsg(sk, msg, len, mtu, headroom, tailroom); + if (IS_ERR_OR_NULL(tmp)) { + kfree_skb(skb); + return tmp; + } + + len -= tmp->len; + + *frag = tmp; + frag = &(*frag)->next; + } + + return skb; +} + int bt_to_errno(u16 code); void hci_sock_set_flag(struct sock *sk, int nr); -- 2.7.4