From patchwork Mon Feb 8 08:00:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 12074155 X-Patchwork-Delegate: kuba@kernel.org 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 5E493C433DB for ; Mon, 8 Feb 2021 07:53:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B26A64E79 for ; Mon, 8 Feb 2021 07:53:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230042AbhBHHxg (ORCPT ); Mon, 8 Feb 2021 02:53:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229807AbhBHHxR (ORCPT ); Mon, 8 Feb 2021 02:53:17 -0500 Received: from mail-wr1-x42b.google.com (mail-wr1-x42b.google.com [IPv6:2a00:1450:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05F76C06178A for ; Sun, 7 Feb 2021 23:52:37 -0800 (PST) Received: by mail-wr1-x42b.google.com with SMTP id u14so15960331wri.3 for ; Sun, 07 Feb 2021 23:52:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=D1xoggkKUYPm/up9HUqtS9Xiw3MkdDwvnq8xK4ouEnc=; b=I2NJxtNZUfne1OWOrl4FXMaO3nzCvzA/Xdl+V5y7Qt3obKOhVHu6NdCg8cXnmLz+HO Jy5VrnFIDkFlBMEW53zRUtAM6EXC+2nt8ybs/MsUJTOP06R2EGrPpvibQMx8g27BDu/h f+YCL5iK55dA/WDVM5k13COKz3FJgFzNlUJmE7KEqDzeSzqg4CtWjcOK+wfimo0dLvIg f7hBw4lWhnXv9nor6omXkP2EZE/SQG/6pLnIL2RGMU5gX/itg2q42pu7KH4S+uLRT7at Dw82pl8RHx34Wz37Dq/Q8mdnnJQ4w11u1CV06J5o/Y/rJSVAP/RDUCjWKb+1HI+qLbIA DQgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=D1xoggkKUYPm/up9HUqtS9Xiw3MkdDwvnq8xK4ouEnc=; b=Mbpt4G/Konm9jQL0OVi3s3W+epFSkz/BGqde6WhVmdwkHo0tH2/4Owt7wOS+FyKnpD rTxIoWEHOhqu7J+7x3kmo3ahywKFosVs8xpP8Q2BlLrudkDOTC+4DnKvqD0yRgtO/ioL c+UIdsHYyiuZWpeIWdYwy6LCdtkIBA14ytWgU2gSogPQEOTJOMbMpu2V4PAR0rxbVjRL uPdaoa82DnQ/nSM1k62+BuWNbPS7hYgb2y7mHLd2gQwB36HUT58TANsND4b6Eu3TMl6x UK+kuyWrTYrwtFjT0ExqKD7rmLUghjR+KFUtUBzFI2bFyakAdRZ/6vNlCP83Ue4hU1d9 DQgA== X-Gm-Message-State: AOAM530fsF5QdesrB06ShqJodDwadGeo/2NnFa5pA4TUc8Z+0cCxq47D YIEjYLYXCDS+kDpJelzZyhm0Jgzn36qdaA== X-Google-Smtp-Source: ABdhPJzy6kdxYozrL4r0PcuuAoUXGacphXW/mfsODTEDRawK4OsAwb9xm+QwgBne9A57kD4k6MdzsA== X-Received: by 2002:a5d:4a4e:: with SMTP id v14mr18504130wrs.80.1612770755536; Sun, 07 Feb 2021 23:52:35 -0800 (PST) Received: from localhost.localdomain ([2a01:e0a:490:8730:2c22:849b:ef6a:c4b9]) by smtp.gmail.com with ESMTPSA id g16sm18784952wmi.30.2021.02.07.23.52.34 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 07 Feb 2021 23:52:35 -0800 (PST) From: Loic Poulain Cc: netdev@vger.kernel.org, bjorn@mork.no, dcbw@redhat.com, carl.yin@quectel.com, mpearson@lenovo.com, cchen50@lenovo.com, jwjiang@lenovo.com, ivan.zhang@quectel.com, naveen.kumar@quectel.com, ivan.mikhanchuk@quectel.com, Loic Poulain Subject: [PATCH net-next v4 1/5] net: mhi: Add protocol support Date: Mon, 8 Feb 2021 09:00:33 +0100 Message-Id: <1612771237-3782-2-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1612771237-3782-1-git-send-email-loic.poulain@linaro.org> References: <1612771237-3782-1-git-send-email-loic.poulain@linaro.org> To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org MHI can transport different protocols, some are handled at upper level, like IP and QMAP(rmnet/netlink), but others will need to be inside MHI net driver, like mbim. This change adds support for protocol rx and tx_fixup callbacks registration, that can be used to encode/decode the targeted protocol. Signed-off-by: Loic Poulain --- drivers/net/mhi_net.c | 69 ++++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 57 insertions(+), 12 deletions(-) diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c index 8800991..b92c2e1 100644 --- a/drivers/net/mhi_net.c +++ b/drivers/net/mhi_net.c @@ -34,11 +34,24 @@ struct mhi_net_dev { struct net_device *ndev; struct sk_buff *skbagg_head; struct sk_buff *skbagg_tail; + const struct mhi_net_proto *proto; + void *proto_data; struct delayed_work rx_refill; struct mhi_net_stats stats; u32 rx_queue_sz; }; +struct mhi_net_proto { + int (*init)(struct mhi_net_dev *mhi_netdev); + struct sk_buff * (*tx_fixup)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb); + void (*rx)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb); +}; + +struct mhi_device_info { + const char *netname; + const struct mhi_net_proto *proto; +}; + static int mhi_ndo_open(struct net_device *ndev) { struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); @@ -68,26 +81,35 @@ static int mhi_ndo_stop(struct net_device *ndev) static int mhi_ndo_xmit(struct sk_buff *skb, struct net_device *ndev) { struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); + const struct mhi_net_proto *proto = mhi_netdev->proto; struct mhi_device *mdev = mhi_netdev->mdev; int err; + if (proto && proto->tx_fixup) { + skb = proto->tx_fixup(mhi_netdev, skb); + if (unlikely(!skb)) + goto exit_drop; + } + err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT); if (unlikely(err)) { net_err_ratelimited("%s: Failed to queue TX buf (%d)\n", ndev->name, err); - - u64_stats_update_begin(&mhi_netdev->stats.tx_syncp); - u64_stats_inc(&mhi_netdev->stats.tx_dropped); - u64_stats_update_end(&mhi_netdev->stats.tx_syncp); - - /* drop the packet */ dev_kfree_skb_any(skb); + goto exit_drop; } if (mhi_queue_is_full(mdev, DMA_TO_DEVICE)) netif_stop_queue(ndev); return NETDEV_TX_OK; + +exit_drop: + u64_stats_update_begin(&mhi_netdev->stats.tx_syncp); + u64_stats_inc(&mhi_netdev->stats.tx_dropped); + u64_stats_update_end(&mhi_netdev->stats.tx_syncp); + + return NETDEV_TX_OK; } static void mhi_ndo_get_stats64(struct net_device *ndev, @@ -164,6 +186,7 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev, struct mhi_result *mhi_res) { struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); + const struct mhi_net_proto *proto = mhi_netdev->proto; struct sk_buff *skb = mhi_res->buf_addr; int free_desc_count; @@ -220,7 +243,10 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev, break; } - netif_rx(skb); + if (proto && proto->rx) + proto->rx(mhi_netdev, skb); + else + netif_rx(skb); } /* Refill if RX buffers queue becomes low */ @@ -302,14 +328,14 @@ static struct device_type wwan_type = { static int mhi_net_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id) { - const char *netname = (char *)id->driver_data; + const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data; struct device *dev = &mhi_dev->dev; struct mhi_net_dev *mhi_netdev; struct net_device *ndev; int err; - ndev = alloc_netdev(sizeof(*mhi_netdev), netname, NET_NAME_PREDICTABLE, - mhi_net_setup); + ndev = alloc_netdev(sizeof(*mhi_netdev), info->netname, + NET_NAME_PREDICTABLE, mhi_net_setup); if (!ndev) return -ENOMEM; @@ -318,6 +344,7 @@ static int mhi_net_probe(struct mhi_device *mhi_dev, mhi_netdev->ndev = ndev; mhi_netdev->mdev = mhi_dev; mhi_netdev->skbagg_head = NULL; + mhi_netdev->proto = info->proto; SET_NETDEV_DEV(ndev, &mhi_dev->dev); SET_NETDEV_DEVTYPE(ndev, &wwan_type); @@ -337,8 +364,16 @@ static int mhi_net_probe(struct mhi_device *mhi_dev, if (err) goto out_err; + if (mhi_netdev->proto) { + err = mhi_netdev->proto->init(mhi_netdev); + if (err) + goto out_err_proto; + } + return 0; +out_err_proto: + unregister_netdev(ndev); out_err: free_netdev(ndev); return err; @@ -358,9 +393,19 @@ static void mhi_net_remove(struct mhi_device *mhi_dev) free_netdev(mhi_netdev->ndev); } +static const struct mhi_device_info mhi_hwip0 = { + .netname = "mhi_hwip%d", +}; + +static const struct mhi_device_info mhi_swip0 = { + .netname = "mhi_swip%d", +}; + static const struct mhi_device_id mhi_net_id_table[] = { - { .chan = "IP_HW0", .driver_data = (kernel_ulong_t)"mhi_hwip%d" }, - { .chan = "IP_SW0", .driver_data = (kernel_ulong_t)"mhi_swip%d" }, + /* Hardware accelerated data PATH (to modem IPA), protocol agnostic */ + { .chan = "IP_HW0", .driver_data = (kernel_ulong_t)&mhi_hwip0 }, + /* Software data PATH (to modem CPU) */ + { .chan = "IP_SW0", .driver_data = (kernel_ulong_t)&mhi_swip0 }, {} }; MODULE_DEVICE_TABLE(mhi, mhi_net_id_table);