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    Subject[PATCH 4.14 22/37] Bluetooth: Add bt_skb_sendmmsg helper
    Date
    From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

    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 <luiz.von.dentz@intel.com>
    Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
    Cc: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/net/bluetooth/bluetooth.h | 38 ++++++++++++++++++++++++++++++++++++++
    1 file changed, 38 insertions(+)

    --- a/include/net/bluetooth/bluetooth.h
    +++ b/include/net/bluetooth/bluetooth.h
    @@ -395,6 +395,44 @@ static inline struct sk_buff *bt_skb_sen
    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);

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