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[23.128.96.18]) by mx.google.com with ESMTP id g1si3752039ejc.697.2021.02.04.10.16.56; Thu, 04 Feb 2021 10:16:57 -0800 (PST) Received-SPF: pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=LTIc3u6c; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238959AbhBDSMh (ORCPT + 7 others); Thu, 4 Feb 2021 13:12:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238846AbhBDSKn (ORCPT ); Thu, 4 Feb 2021 13:10:43 -0500 Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2BD79C061788 for ; Thu, 4 Feb 2021 10:10:03 -0800 (PST) Received: by mail-wm1-x32f.google.com with SMTP id m1so3819493wml.2 for ; Thu, 04 Feb 2021 10:10:03 -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=LTIc3u6c3DZDhhChstnwspg8FIR9Po9sRU9pZFQwA3omWkQrHG3MDZqIJ1QaDnSzmX szdoQOyPmGKTK+GUvhs6HEUpyZNryCWxC/I6etoP1WhemeOlfCWoJCbAMK2eH9aRCyCL cctCTtTm+3bqT0pE09ekflQsMA5L27vG4u/cAuXteNbAZKV0DWnTeXkVvJ/mQkHtBQkm 3CNMCeWYjtpS93XiGklxWcHM0iBWZgD2uF6ARq74wb8d42n8Ve5ggQepuSNzDxG0m96y Jor92YIZXk+Ip08lF7ius8oI9i1M6c/ZwuIhIddPY6qccepzfgBybleCcYTPPpu5dMqD 0g7g== 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=Xlt+WH0D0NqOpNGUAZFxZzKsYfw0WN1rt0zn2ZfON/iDNh6bZm1XcV8A5yVzQILnX3 D7LtZQorlyEsGsipYCKO189IdhUF8KZVco2hemmac6T2cTO59iDD7wH6xHb26BARw5Lx LlwwQZi+lClz6nzUbAtuqTrYS81I6L0K5y5SmtYUYymqvc2eDZJVzmGwj/ZInW53VrAA yEjDgAdKlyE7xTBzj+a/33ZYcU3LQJwwpQQLpSyTxfqY+7AGqiOJi6WLN91fbPYQ/zaj gsHNI5A5oq3xlJ2OUQac4o8cVg9dc6eYGlhhrQT4b0hvjskUqXLBETvo+mZuxCdtgrUw 826A== X-Gm-Message-State: AOAM531pG8iQvIWAPpYcLbtXraPUe26sCVS2JEOUZSRNgXeEr2eI/gD4 AgZVvOuO0eeP54IEAcg6OUZY+A== X-Received: by 2002:a1c:2d48:: with SMTP id t69mr366927wmt.124.1612462201837; Thu, 04 Feb 2021 10:10:01 -0800 (PST) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id m6sm6313746wmq.13.2021.02.04.10.10.00 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 Feb 2021 10:10:01 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net 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, Loic Poulain Subject: [PATCH net-next v3 1/5] net: mhi: Add protocol support Date: Thu, 4 Feb 2021 19:17:37 +0100 Message-Id: <1612462661-23045-2-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1612462661-23045-1-git-send-email-loic.poulain@linaro.org> References: <1612462661-23045-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.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(-) -- 2.7.4 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);