From patchwork Fri Dec 3 13:18:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Mailhol X-Patchwork-Id: 12694700 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 29662C433FE for ; Fri, 3 Dec 2021 13:20:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=+XYHmA55S7n8P84jNoxfHwfu5y21CzpiKSnQmtGMCNg=; b=cEUTopJsK4AtXw +/NPZJUx8fgk+49uvoiKO72BLgPxknLxFxqZ5F230JPbElRUzwI8z/GoqHkSBk/Ww/vmXfr6Pj8tT 0Nh1HXwBKvfAs0UFNsX90WDPjnJ+2BOF14HT2nOPAPZsb3jmphaBlFoYdKnZcAuGnryNPbgfVOZ2o 1SXP1dwtPu1/n2Ke7MSYfkGt4bvIisd9Gt8YIMvlh74JB8agOhdRcoYs4YvsHSZdjoDnQZwcau4l6 d117X0F9X9KYKs6Am2cSpXskkPo5Y4tqISMmmOwbLVkHC5Mh1wkCVlmYJLmZY7gY8WWVqsSe3jznQ RtWneG23iQl35wKNRa2g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mt8SZ-00Ft5m-Ja; Fri, 03 Dec 2021 13:18:43 +0000 Received: from smtp04.smtpout.orange.fr ([80.12.242.126] helo=smtp.smtpout.orange.fr) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mt8ST-00Ft43-0c for linux-arm-kernel@lists.infradead.org; Fri, 03 Dec 2021 13:18:41 +0000 Received: from localhost.localdomain ([114.149.34.46]) by smtp.orange.fr with ESMTPA id t8S9mZgOjWUfjt8SGmn0s3; Fri, 03 Dec 2021 14:18:28 +0100 X-ME-Helo: localhost.localdomain X-ME-Auth: MDU0YmViZGZmMDIzYiBlMiM2NTczNTRjNWZkZTMwOGRiOGQ4ODf3NWI1ZTMyMzdiODlhOQ== X-ME-Date: Fri, 03 Dec 2021 14:18:28 +0100 X-ME-IP: 114.149.34.46 From: Vincent Mailhol To: Marc Kleine-Budde , linux-can@vger.kernel.org Cc: Oliver Hartkopp , Jimmy Assarsson , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, Vincent Mailhol Subject: [PATCH v4 0/5] fix statistics and payload issues for error Date: Fri, 3 Dec 2021 22:18:03 +0900 Message-Id: <20211203131808.2380042-1-mailhol.vincent@wanadoo.fr> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211203_051837_256790_BFCC9BC0 X-CRM114-Status: GOOD ( 25.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Important: this patch series depends on below patch: https://lore.kernel.org/linux-can/20211123111654.621610-1-mailhol.vincent@wanadoo.fr/T/#u There are some common errors which are made when updating the network statistics or processing the CAN payload: 1. Incrementing the "normal" stats when generating or sending a CAN error message frame. Error message frames are an abstraction of Socket CAN and do not exist on the wire. The first patch of this series fixes the RX stats for 22 different drivers, the second one fixes the TX stasts for the kvaser driver (N.B. only this driver is capable of sending error on the bus). 2. Copying the payload of RTR frames: RTR frames have no payload and the data buffer only contains garbage. The DLC/length should not be used to do a memory copy. The third patch of this series address this issue for 3 different drivers. 3. Counting the length of the Remote Transmission Frames (RTR). The length of an RTR frame is the length of the requested frame not the actual payload. In reality the payload of an RTR frame is always 0 bytes long. The fourth patch of this series fixes the RX stats for 27 different drivers and the fifth one fixes the TX stats for 25 different ones. * Changelog * v3 -> v4: * patch 2/5: kvaser: include the suggestion from Jimmy Assarsson so that we don't need to get the original CAN frame anymore to determine whether or not it was an error frame. patch 5/5 is rebased accordingly. * patch 5/5: kvaser: kvaser_usb_hydra_frame_to_cmd_std: remove unrelated change. * patch 5/5: slcan: better factorize code for the tx RTR frames (reorder the line instead of adding a new "if" branch). v2 -> v3: * Fix an issue in the fourth patch ("do not increase rx_bytes statistics for RTR frames"). In ucan_rx_can_msg() of the ucan driver, the changes in v2 made no sense. Reverted it to v1. v1 -> v2: * can_rx_offload_napi_poll: v1 used CAN_ERR_MASK instead of CAN_ERR_FLAG. Fixed the issue. * use correct vocabulary. The correct term to designate the Socket CAN specific error skb is "error message frames" not "error frames". "error frames" is used in the standard and has a different meaning. * better factorize code for the rx RTR frames. Most of the driver already has a switch to check if the frame is a RTR. Moved the instruction to increase net_device_stats:rx_bytes inside the else branch of those switches whenever possible (for some drivers with some complex logic, putting and additional RTR check was easier). * add a patch which prevent drivers to copy the payload of RTR frames. * add a patch to cover the tx RTR frames (the fifth patch of v2). The tx RTR frames issue was supposedly covered by the can_get_echo_skb() function which returns the correct length for drivers to increase their stats. However, the reality is that most of the drivers do not check this value and instead use a local copy of the length/dlc. Vincent Mailhol (5): can: do not increase rx statistics when generating a CAN rx error message frame can: kvaser_usb: do not increase tx statistics when sending error message frames can: do not copy the payload of RTR frames can: do not increase rx_bytes statistics for RTR frames can: do not increase tx_bytes statistics for RTR frames drivers/net/can/at91_can.c | 18 ++--- drivers/net/can/c_can/c_can.h | 1 - drivers/net/can/c_can/c_can_main.c | 16 ++--- drivers/net/can/cc770/cc770.c | 16 ++--- drivers/net/can/dev/dev.c | 4 -- drivers/net/can/dev/rx-offload.c | 7 +- drivers/net/can/grcan.c | 6 +- drivers/net/can/ifi_canfd/ifi_canfd.c | 11 +-- drivers/net/can/janz-ican3.c | 6 +- drivers/net/can/kvaser_pciefd.c | 16 ++--- drivers/net/can/m_can/m_can.c | 13 +--- drivers/net/can/mscan/mscan.c | 14 ++-- drivers/net/can/pch_can.c | 33 ++++----- drivers/net/can/peak_canfd/peak_canfd.c | 14 ++-- drivers/net/can/rcar/rcar_can.c | 22 +++--- drivers/net/can/rcar/rcar_canfd.c | 13 +--- drivers/net/can/sja1000/sja1000.c | 11 ++- drivers/net/can/slcan.c | 7 +- drivers/net/can/softing/softing_main.c | 8 +-- drivers/net/can/spi/hi311x.c | 31 ++++---- drivers/net/can/spi/mcp251x.c | 31 ++++---- drivers/net/can/sun4i_can.c | 22 +++--- drivers/net/can/usb/ems_usb.c | 14 ++-- drivers/net/can/usb/esd_usb2.c | 13 ++-- drivers/net/can/usb/etas_es58x/es58x_core.c | 7 -- drivers/net/can/usb/gs_usb.c | 7 +- drivers/net/can/usb/kvaser_usb/kvaser_usb.h | 5 +- .../net/can/usb/kvaser_usb/kvaser_usb_core.c | 4 +- .../net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 71 +++++++++---------- .../net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 20 ++---- drivers/net/can/usb/mcba_usb.c | 23 +++--- drivers/net/can/usb/peak_usb/pcan_usb.c | 9 ++- drivers/net/can/usb/peak_usb/pcan_usb_core.c | 20 +++--- drivers/net/can/usb/peak_usb/pcan_usb_core.h | 1 - drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 11 ++- drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 12 ++-- drivers/net/can/usb/ucan.c | 17 +++-- drivers/net/can/usb/usb_8dev.c | 17 ++--- drivers/net/can/vcan.c | 7 +- drivers/net/can/vxcan.c | 2 +- drivers/net/can/xilinx_can.c | 19 +++-- include/linux/can/skb.h | 5 +- 42 files changed, 254 insertions(+), 350 deletions(-) base-commit: 4cc19cc269921210f3da65e4b038ad987835b342