From patchwork Wed Aug 5 03:50:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Changzhong X-Patchwork-Id: 262710 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 C6041C433E0 for ; Wed, 5 Aug 2020 03:51:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B420E20842 for ; Wed, 5 Aug 2020 03:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727808AbgHEDvP (ORCPT ); Tue, 4 Aug 2020 23:51:15 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:35370 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726305AbgHEDu5 (ORCPT ); Tue, 4 Aug 2020 23:50:57 -0400 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id EB04F3C152A363C86B4A; Wed, 5 Aug 2020 11:50:53 +0800 (CST) Received: from localhost.localdomain (10.175.112.70) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server (TLS) id 14.3.487.0; Wed, 5 Aug 2020 11:50:50 +0800 From: Zhang Changzhong To: , , , , , , CC: , , Subject: [PATCH net 4/4] can: j1939: add rxtimer for multipacket broadcast session Date: Wed, 5 Aug 2020 11:50:25 +0800 Message-ID: <1596599425-5534-5-git-send-email-zhangchangzhong@huawei.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1596599425-5534-1-git-send-email-zhangchangzhong@huawei.com> References: <1596599425-5534-1-git-send-email-zhangchangzhong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.70] X-CFilter-Loop: Reflected Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org According to SAE J1939/21 (Chapter 5.12.3 and APPENDIX C), for transmit side the required time interval between packets of a multipacket broadcast message is 50 to 200 ms, the responder shall use a timeout of 250ms (provides margin allowing for the maximumm spacing of 200ms). For receive side a timeout will occur when a time of greater than 750 ms elapsed between two message packets when more packets were expected. So this patch fix and add rxtimer for multipacket broadcast session. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Zhang Changzhong --- net/can/j1939/transport.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index 5757f9f..fad210e 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -716,10 +716,12 @@ static int j1939_session_tx_rts(struct j1939_session *session) return ret; session->last_txcmd = dat[0]; - if (dat[0] == J1939_TP_CMD_BAM) + if (dat[0] == J1939_TP_CMD_BAM) { j1939_tp_schedule_txtimer(session, 50); - - j1939_tp_set_rxtimeout(session, 1250); + j1939_tp_set_rxtimeout(session, 250); + } else { + j1939_tp_set_rxtimeout(session, 1250); + } netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); @@ -1665,11 +1667,15 @@ static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb, } session->last_cmd = cmd; - j1939_tp_set_rxtimeout(session, 1250); - - if (cmd != J1939_TP_CMD_BAM && !session->transmission) { - j1939_session_txtimer_cancel(session); - j1939_tp_schedule_txtimer(session, 0); + if (cmd == J1939_TP_CMD_BAM) { + if (!session->transmission) + j1939_tp_set_rxtimeout(session, 750); + } else { + if (!session->transmission) { + j1939_session_txtimer_cancel(session); + j1939_tp_schedule_txtimer(session, 0); + } + j1939_tp_set_rxtimeout(session, 1250); } j1939_session_put(session); @@ -1720,6 +1726,7 @@ static void j1939_xtp_rx_dat_one(struct j1939_session *session, int offset; int nbytes; bool final = false; + bool remain = false; bool do_cts_eoma = false; int packet; @@ -1781,6 +1788,8 @@ static void j1939_xtp_rx_dat_one(struct j1939_session *session, j1939_cb_is_broadcast(&session->skcb)) { if (session->pkt.rx >= session->pkt.total) final = true; + else + remain = true; } else { /* never final, an EOMA must follow */ if (session->pkt.rx >= session->pkt.last) @@ -1790,6 +1799,9 @@ static void j1939_xtp_rx_dat_one(struct j1939_session *session, if (final) { j1939_session_timers_cancel(session); j1939_session_completed(session); + } else if (remain) { + if (!session->transmission) + j1939_tp_set_rxtimeout(session, 750); } else if (do_cts_eoma) { j1939_tp_set_rxtimeout(session, 1250); if (!session->transmission)