From patchwork Fri Sep 3 22:27:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luiz Augusto von Dentz X-Patchwork-Id: 506634 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 650E1C433EF for ; Fri, 3 Sep 2021 22:27:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3906660C51 for ; Fri, 3 Sep 2021 22:27:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233620AbhICW2h (ORCPT ); Fri, 3 Sep 2021 18:28:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233033AbhICW2h (ORCPT ); Fri, 3 Sep 2021 18:28:37 -0400 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26A69C061575 for ; Fri, 3 Sep 2021 15:27:37 -0700 (PDT) Received: by mail-pg1-x529.google.com with SMTP id c17so487378pgc.0 for ; Fri, 03 Sep 2021 15:27:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=mljDYYlLDcj/0CkTyYH9Brnr1HPRQ48Nwhm/HTTbv9s=; b=UoFPSQVSt5FfCbDjJxMQXcwsfN0aZbp++dQcOOp9PcRNmoMm/CBVH+h8kBiNh0IiBA VmLt88993ZWffJdM+QnpmqER1oS+gqaCyGJYjn+sdFACIkNHZSJwnaLuVCVBHG71tbEu ThabQ7HzrxP/2cC8NVx7AsDeblTbp4IlJN34LzUEmMNrB1SCjptGYOIGWHQRntFNe6UK bcAl9vYn0coxikEBiY3Bg9PnRXnOzbgQYrCK+aa+FH6JOdfgPmhRitZjJTCbWdtArnij DSG7wF9yvdIzU+RI8M45omKnWM44rHaMTCZQdFC8S/u0jBgOp6OJDq5jKwalb6RQ+H3c KPGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=mljDYYlLDcj/0CkTyYH9Brnr1HPRQ48Nwhm/HTTbv9s=; b=JhrvUmwTyLy/WQdplnWJyiWHvvTDHUN/cJTCZjRtH1lW1AP4KcoMtFOm670C6Bmgyl MNFtuNmsb1yF82MO7gFQU7l0lAU01A67kFVfHo86i9QhBibkx0Xdh1KUWd/7/wRlm5za PU20fNE4TqGicLYhtAz/tf2heQ6cAe0WT7nwMxigfkO3f5OU2y3qjAArxwTW9Am9I+y0 /ocur+ge90C3+6ZdsHO8YBKPNDw/v40evdAQLF7CSGHBavX9griB70LYrLz7/BcSyUgD qTHscZjsVodxngBp3uHQNN5239AjTHjCKSYJ3L7uyLj5WeUB5O9qnYXVTcrHta600iJl XYSQ== X-Gm-Message-State: AOAM531zwE39K4D5QW644QJX3J4wvfFdiZX60+GNYZ27zdqKz8wIqJ14 FjrZ+ySZGMjOOZ4ln7YdXjib34L3fa0= X-Google-Smtp-Source: ABdhPJwnzRsO6gY1qtDMVRA0x6ma3WbMXnIJh6SrXqgsk5dIp7PqTZ7aRv1ouvJFtCKXnFQTyMzyRw== X-Received: by 2002:a63:a55a:: with SMTP id r26mr1034150pgu.13.1630708056180; Fri, 03 Sep 2021 15:27:36 -0700 (PDT) Received: from localhost.localdomain (c-71-56-157-77.hsd1.or.comcast.net. [71.56.157.77]) by smtp.gmail.com with ESMTPSA id x4sm225796pjq.20.2021.09.03.15.27.35 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Sep 2021 15:27:35 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v3 2/4] Bluetooth: Add bt_skb_sendmmsg helper Date: Fri, 3 Sep 2021 15:27:30 -0700 Message-Id: <20210903222732.1472560-2-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210903222732.1472560-1-luiz.dentz@gmail.com> References: <20210903222732.1472560-1-luiz.dentz@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz 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 --- 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 aa6f8fe897ce..82a83b3b77b8 100644 --- a/include/net/bluetooth/bluetooth.h +++ b/include/net/bluetooth/bluetooth.h @@ -448,6 +448,44 @@ 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);