From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82E23C04A68 for ; Wed, 27 Jul 2022 16:35:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237254AbiG0QfF (ORCPT ); Wed, 27 Jul 2022 12:35:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237662AbiG0Qdn (ORCPT ); Wed, 27 Jul 2022 12:33:43 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E34254C94; Wed, 27 Jul 2022 09:26:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 1A1FACE2303; Wed, 27 Jul 2022 16:26:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F8C7C433D6; Wed, 27 Jul 2022 16:26:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658939198; bh=Wvw7I+nGSwocAWbyQDmTKOy9jcP8+ZoXNRue2rb7Ycg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eJP6p22CqlgMJJUYIT/quJRm5z17w17kmRFb06mMBP1eU5b3XwYuuhx2Dgs0jHWa5 ldE+rWjsYBcTMFUPyU1wOWIHk6hGF4XoCxIckxP1r4Ox+M252wG27OI4PqXr7251zt Dxjmazeu6LOW9qZJSehWh2F+Hn68oI3FrkhmzqCU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Luiz Augusto von Dentz , Marcel Holtmann , Harshit Mogalapalli Subject: [PATCH 4.19 46/62] Bluetooth: Add bt_skb_sendmmsg helper Date: Wed, 27 Jul 2022 18:10:55 +0200 Message-Id: <20220727161005.947877005@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220727161004.175638564@linuxfoundation.org> References: <20220727161004.175638564@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Luiz Augusto von Dentz 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(+) --- a/include/net/bluetooth/bluetooth.h +++ b/include/net/bluetooth/bluetooth.h @@ -398,6 +398,44 @@ 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);