From nobody Mon Feb 9 15:47:59 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF193C7EE24 for ; Tue, 6 Jun 2023 12:31:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237194AbjFFMbg (ORCPT ); Tue, 6 Jun 2023 08:31:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236845AbjFFMbd (ORCPT ); Tue, 6 Jun 2023 08:31:33 -0400 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9883D10C6 for ; Tue, 6 Jun 2023 05:31:30 -0700 (PDT) Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-1b01d3bb571so26319315ad.2 for ; Tue, 06 Jun 2023 05:31:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1686054690; x=1688646690; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4bR4/JDXMxihfPEGKcTXFJHlKlbGf1Imp+ICKaG0tKk=; b=Lsv9Pjc/J5JCZCZkwVIv1r9X0WEbg5FRCdvenElvxxx0PTZEf8gbj9362LLy1ehymJ zociLJ2QXW/iA3xrTvZhEf4OI/piTJrkwU50aY/wvDIRfdpS+PJFBI1UsP2nNOYucREf DmI0QD+5EalV8fer6j1blh9WOsYETWSKzCucZTrgBt/wWL4a/WIdMiqcMJMgLobqUPCm HR6QFWMgbTQt/ljD2zy99UUFzpG4lZASRyrakL2irja6MtwiAxZ/LN8DSB85cw3lcm8h 2vWjo6QjCntgUNa/2pDm5kka+8vrmidC7NKtfxHtRgOshQ+CmVxfDSlHGgc161kaOkXy TwAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686054690; x=1688646690; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4bR4/JDXMxihfPEGKcTXFJHlKlbGf1Imp+ICKaG0tKk=; b=dK+5wdi1cBW9wrg/fbusScMpGH8TtLTWi9jncc9whGc3CRGKGa391QH565c73hED6j mNNozUghq6bjdXUhvyKJ0NORkcl3Z/2Y6mxYBWDvNP1lLS1e7GdIyyjPMbZNeFbGHG0m GExVPEXPjLfvbfEX84bxZdSPfxiMI8mnibwGi2jXiIW/q5IA9jUy2pzs9poPxfy66Om+ YBozYu0DsJElkJUGH7K8HvxwHVdh4jxxFS+wUKrVSOLpy99IiJXhbRwJpZanWSeKc4sZ X7ItqT8p2jWThP+3atBv0dpBOBklaF9Nvo2O439OymxB2Qw9+vb5DfxBGO1azYbNr8+5 luDQ== X-Gm-Message-State: AC+VfDzm1+TL7B5ceWlUgOT3SYe1yB0Kc9vJgQHMd7jQsojoo1ZbD4Nf 5T47GQNDSw735rSdNeG1pVHH X-Google-Smtp-Source: ACHHUZ4wOgD8oZXJOUzfrt5cyuhOiIytzpywDtwkmMEz/ZhifHxmQ+jj+TpidcYSbsz6Q9nB3rZQNw== X-Received: by 2002:a17:903:1250:b0:1b0:4680:3f with SMTP id u16-20020a170903125000b001b04680003fmr764540plh.41.1686054689929; Tue, 06 Jun 2023 05:31:29 -0700 (PDT) Received: from localhost.localdomain ([117.202.186.178]) by smtp.gmail.com with ESMTPSA id q5-20020a170902c74500b001ae59169f05sm8446431plq.182.2023.06.06.05.31.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jun 2023 05:31:29 -0700 (PDT) From: Manivannan Sadhasivam To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, Manivannan Sadhasivam Subject: [PATCH 1/3] net: Add MHI Endpoint network driver Date: Tue, 6 Jun 2023 18:01:17 +0530 Message-Id: <20230606123119.57499-2-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230606123119.57499-1-manivannan.sadhasivam@linaro.org> References: <20230606123119.57499-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add a network driver for the Modem Host Interface (MHI) endpoint devices that provides network interfaces to the PCIe based Qualcomm endpoint devices supporting MHI bus. This driver allows the MHI endpoint devices to establish IP communication with the host machines (x86, ARM64) over MHI bus. The driver currently supports only IP_SW0 MHI channel that can be used to route IP traffic from the endpoint CPU to host machine. Signed-off-by: Manivannan Sadhasivam --- drivers/net/Kconfig | 9 ++ drivers/net/Makefile | 1 + drivers/net/mhi_ep_net.c | 331 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 341 insertions(+) create mode 100644 drivers/net/mhi_ep_net.c diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 368c6f5b327e..ec1382d7fcbd 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -452,6 +452,15 @@ config MHI_NET QCOM based WWAN modems for IP or QMAP/rmnet protocol (like SDX55). Say Y or M. =20 +config MHI_EP_NET + tristate "MHI Endpoint network driver" + depends on MHI_BUS_EP + help + This is the network driver for MHI bus implementation in endpoint + devices. It is used provide the network interface for QCOM modems + such as SDX55. + Say Y or M. + endif # NET_CORE =20 config SUNGEM_PHY diff --git a/drivers/net/Makefile b/drivers/net/Makefile index e26f98f897c5..b8e706a4150e 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_NLMON) +=3D nlmon.o obj-$(CONFIG_NET_VRF) +=3D vrf.o obj-$(CONFIG_VSOCKMON) +=3D vsockmon.o obj-$(CONFIG_MHI_NET) +=3D mhi_net.o +obj-$(CONFIG_MHI_EP_NET) +=3D mhi_ep_net.o =20 # # Networking Drivers diff --git a/drivers/net/mhi_ep_net.c b/drivers/net/mhi_ep_net.c new file mode 100644 index 000000000000..b3960814c879 --- /dev/null +++ b/drivers/net/mhi_ep_net.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * MHI Endpoint Network driver + * + * Based on drivers/net/mhi_net.c + * + * Copyright (c) 2023, Linaro Ltd. + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include + +#define MHI_NET_MIN_MTU ETH_MIN_MTU +#define MHI_NET_MAX_MTU 0xffff + +struct mhi_ep_net_stats { + u64_stats_t rx_packets; + u64_stats_t rx_bytes; + u64_stats_t rx_errors; + u64_stats_t tx_packets; + u64_stats_t tx_bytes; + u64_stats_t tx_errors; + u64_stats_t tx_dropped; + struct u64_stats_sync tx_syncp; + struct u64_stats_sync rx_syncp; +}; + +struct mhi_ep_net_dev { + struct mhi_ep_device *mdev; + struct net_device *ndev; + struct mhi_ep_net_stats stats; + struct workqueue_struct *xmit_wq; + struct work_struct xmit_work; + struct sk_buff_head tx_buffers; + spinlock_t tx_lock; /* Lock for protecting tx_buffers */ + u32 mru; +}; + +static void mhi_ep_net_dev_process_queue_packets(struct work_struct *work) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D container_of(work, + struct mhi_ep_net_dev, xmit_work); + struct mhi_ep_device *mdev =3D mhi_ep_netdev->mdev; + struct sk_buff_head q; + struct sk_buff *skb; + int ret; + + if (mhi_ep_queue_is_empty(mdev, DMA_FROM_DEVICE)) { + netif_stop_queue(mhi_ep_netdev->ndev); + return; + } + + __skb_queue_head_init(&q); + + spin_lock_bh(&mhi_ep_netdev->tx_lock); + skb_queue_splice_init(&mhi_ep_netdev->tx_buffers, &q); + spin_unlock_bh(&mhi_ep_netdev->tx_lock); + + while ((skb =3D __skb_dequeue(&q))) { + ret =3D mhi_ep_queue_skb(mdev, skb); + if (ret) { + kfree(skb); + goto exit_drop; + } + + u64_stats_update_begin(&mhi_ep_netdev->stats.tx_syncp); + u64_stats_inc(&mhi_ep_netdev->stats.tx_packets); + u64_stats_add(&mhi_ep_netdev->stats.tx_bytes, skb->len); + u64_stats_update_end(&mhi_ep_netdev->stats.tx_syncp); + + /* Check if queue is empty */ + if (mhi_ep_queue_is_empty(mdev, DMA_FROM_DEVICE)) { + netif_stop_queue(mhi_ep_netdev->ndev); + break; + } + + consume_skb(skb); + cond_resched(); + } + + return; + +exit_drop: + u64_stats_update_begin(&mhi_ep_netdev->stats.tx_syncp); + u64_stats_inc(&mhi_ep_netdev->stats.tx_dropped); + u64_stats_update_end(&mhi_ep_netdev->stats.tx_syncp); +} + +static int mhi_ndo_open(struct net_device *ndev) +{ + netif_carrier_on(ndev); + netif_start_queue(ndev); + + return 0; +} + +static int mhi_ndo_stop(struct net_device *ndev) +{ + netif_stop_queue(ndev); + netif_carrier_off(ndev); + + return 0; +} + +static netdev_tx_t mhi_ndo_xmit(struct sk_buff *skb, struct net_device *nd= ev) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D netdev_priv(ndev); + + spin_lock(&mhi_ep_netdev->tx_lock); + skb_queue_tail(&mhi_ep_netdev->tx_buffers, skb); + spin_unlock(&mhi_ep_netdev->tx_lock); + + queue_work(mhi_ep_netdev->xmit_wq, &mhi_ep_netdev->xmit_work); + + return NETDEV_TX_OK; +} + +static void mhi_ndo_get_stats64(struct net_device *ndev, + struct rtnl_link_stats64 *stats) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D netdev_priv(ndev); + unsigned int start; + + do { + start =3D u64_stats_fetch_begin(&mhi_ep_netdev->stats.rx_syncp); + stats->rx_packets =3D u64_stats_read(&mhi_ep_netdev->stats.rx_packets); + stats->rx_bytes =3D u64_stats_read(&mhi_ep_netdev->stats.rx_bytes); + stats->rx_errors =3D u64_stats_read(&mhi_ep_netdev->stats.rx_errors); + } while (u64_stats_fetch_retry(&mhi_ep_netdev->stats.rx_syncp, start)); + + do { + start =3D u64_stats_fetch_begin(&mhi_ep_netdev->stats.tx_syncp); + stats->tx_packets =3D u64_stats_read(&mhi_ep_netdev->stats.tx_packets); + stats->tx_bytes =3D u64_stats_read(&mhi_ep_netdev->stats.tx_bytes); + stats->tx_errors =3D u64_stats_read(&mhi_ep_netdev->stats.tx_errors); + stats->tx_dropped =3D u64_stats_read(&mhi_ep_netdev->stats.tx_dropped); + } while (u64_stats_fetch_retry(&mhi_ep_netdev->stats.tx_syncp, start)); +} + +static const struct net_device_ops mhi_ep_netdev_ops =3D { + .ndo_open =3D mhi_ndo_open, + .ndo_stop =3D mhi_ndo_stop, + .ndo_start_xmit =3D mhi_ndo_xmit, + .ndo_get_stats64 =3D mhi_ndo_get_stats64, +}; + +static void mhi_ep_net_setup(struct net_device *ndev) +{ + ndev->header_ops =3D NULL; /* No header */ + ndev->type =3D ARPHRD_RAWIP; + ndev->hard_header_len =3D 0; + ndev->addr_len =3D 0; + ndev->flags =3D IFF_POINTOPOINT | IFF_NOARP; + ndev->netdev_ops =3D &mhi_ep_netdev_ops; + ndev->mtu =3D MHI_EP_DEFAULT_MTU; + ndev->min_mtu =3D MHI_NET_MIN_MTU; + ndev->max_mtu =3D MHI_NET_MAX_MTU; + ndev->tx_queue_len =3D 1000; +} + +static void mhi_ep_net_ul_callback(struct mhi_ep_device *mhi_dev, + struct mhi_result *mhi_res) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D dev_get_drvdata(&mhi_dev->dev); + struct net_device *ndev =3D mhi_ep_netdev->ndev; + struct sk_buff *skb; + size_t size; + + size =3D mhi_ep_netdev->mru ? mhi_ep_netdev->mru : READ_ONCE(ndev->mtu); + + skb =3D netdev_alloc_skb(ndev, size); + if (unlikely(!skb)) { + u64_stats_update_begin(&mhi_ep_netdev->stats.rx_syncp); + u64_stats_inc(&mhi_ep_netdev->stats.rx_errors); + u64_stats_update_end(&mhi_ep_netdev->stats.rx_syncp); + return; + } + + skb_copy_to_linear_data(skb, mhi_res->buf_addr, mhi_res->bytes_xferd); + skb->len =3D mhi_res->bytes_xferd; + skb->dev =3D mhi_ep_netdev->ndev; + + if (unlikely(mhi_res->transaction_status)) { + switch (mhi_res->transaction_status) { + case -ENOTCONN: + /* MHI layer stopping/resetting the UL channel */ + dev_kfree_skb_any(skb); + return; + default: + /* Unknown error, simply drop */ + dev_kfree_skb_any(skb); + u64_stats_update_begin(&mhi_ep_netdev->stats.rx_syncp); + u64_stats_inc(&mhi_ep_netdev->stats.rx_errors); + u64_stats_update_end(&mhi_ep_netdev->stats.rx_syncp); + } + } else { + skb_put(skb, mhi_res->bytes_xferd); + + switch (skb->data[0] & 0xf0) { + case 0x40: + skb->protocol =3D htons(ETH_P_IP); + break; + case 0x60: + skb->protocol =3D htons(ETH_P_IPV6); + break; + default: + skb->protocol =3D htons(ETH_P_MAP); + break; + } + + u64_stats_update_begin(&mhi_ep_netdev->stats.rx_syncp); + u64_stats_inc(&mhi_ep_netdev->stats.rx_packets); + u64_stats_add(&mhi_ep_netdev->stats.rx_bytes, skb->len); + u64_stats_update_end(&mhi_ep_netdev->stats.rx_syncp); + netif_rx(skb); + } +} + +static void mhi_ep_net_dl_callback(struct mhi_ep_device *mhi_dev, + struct mhi_result *mhi_res) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D dev_get_drvdata(&mhi_dev->dev); + + if (unlikely(mhi_res->transaction_status =3D=3D -ENOTCONN)) + return; + + /* Since we got enough buffers to queue, wake the queue if stopped */ + if (netif_queue_stopped(mhi_ep_netdev->ndev)) { + netif_wake_queue(mhi_ep_netdev->ndev); + queue_work(mhi_ep_netdev->xmit_wq, &mhi_ep_netdev->xmit_work); + } +} + +static int mhi_ep_net_newlink(struct mhi_ep_device *mhi_dev, struct net_de= vice *ndev) +{ + struct mhi_ep_net_dev *mhi_ep_netdev; + int ret; + + mhi_ep_netdev =3D netdev_priv(ndev); + + dev_set_drvdata(&mhi_dev->dev, mhi_ep_netdev); + mhi_ep_netdev->ndev =3D ndev; + mhi_ep_netdev->mdev =3D mhi_dev; + mhi_ep_netdev->mru =3D mhi_dev->mhi_cntrl->mru; + + skb_queue_head_init(&mhi_ep_netdev->tx_buffers); + spin_lock_init(&mhi_ep_netdev->tx_lock); + + u64_stats_init(&mhi_ep_netdev->stats.rx_syncp); + u64_stats_init(&mhi_ep_netdev->stats.tx_syncp); + + mhi_ep_netdev->xmit_wq =3D alloc_workqueue("mhi_ep_net_xmit_wq", 0, WQ_HI= GHPRI); + INIT_WORK(&mhi_ep_netdev->xmit_work, mhi_ep_net_dev_process_queue_packets= ); + + ret =3D register_netdev(ndev); + if (ret) { + destroy_workqueue(mhi_ep_netdev->xmit_wq); + return ret; + } + + return 0; +} + +static void mhi_ep_net_dellink(struct mhi_ep_device *mhi_dev, struct net_d= evice *ndev) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D netdev_priv(ndev); + + destroy_workqueue(mhi_ep_netdev->xmit_wq); + unregister_netdev(ndev); + free_netdev(ndev); + dev_set_drvdata(&mhi_dev->dev, NULL); +} + +static int mhi_ep_net_probe(struct mhi_ep_device *mhi_dev, const struct mh= i_device_id *id) +{ + struct net_device *ndev; + int ret; + + ndev =3D alloc_netdev(sizeof(struct mhi_ep_net_dev), (const char *)id->dr= iver_data, + NET_NAME_PREDICTABLE, mhi_ep_net_setup); + if (!ndev) + return -ENOMEM; + + SET_NETDEV_DEV(ndev, &mhi_dev->dev); + + ret =3D mhi_ep_net_newlink(mhi_dev, ndev); + if (ret) { + free_netdev(ndev); + return ret; + } + + return 0; +} + +static void mhi_ep_net_remove(struct mhi_ep_device *mhi_dev) +{ + struct mhi_ep_net_dev *mhi_ep_netdev =3D dev_get_drvdata(&mhi_dev->dev); + + mhi_ep_net_dellink(mhi_dev, mhi_ep_netdev->ndev); +} + +static const struct mhi_device_id mhi_ep_net_id_table[] =3D { + /* Software data PATH (from endpoint CPU) */ + { .chan =3D "IP_SW0", .driver_data =3D (kernel_ulong_t)"mhi_swip%d" }, + {} +}; +MODULE_DEVICE_TABLE(mhi, mhi_ep_net_id_table); + +static struct mhi_ep_driver mhi_ep_net_driver =3D { + .probe =3D mhi_ep_net_probe, + .remove =3D mhi_ep_net_remove, + .dl_xfer_cb =3D mhi_ep_net_dl_callback, + .ul_xfer_cb =3D mhi_ep_net_ul_callback, + .id_table =3D mhi_ep_net_id_table, + .driver =3D { + .name =3D "mhi_ep_net", + .owner =3D THIS_MODULE, + }, +}; + +module_mhi_ep_driver(mhi_ep_net_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("MHI Endpoint Network driver"); +MODULE_LICENSE("GPL"); --=20 2.25.1 From nobody Mon Feb 9 15:47:59 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED25EC7EE24 for ; Tue, 6 Jun 2023 12:31:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237241AbjFFMbj (ORCPT ); Tue, 6 Jun 2023 08:31:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237007AbjFFMbe (ORCPT ); Tue, 6 Jun 2023 08:31:34 -0400 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9B1210C3 for ; 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Tue, 06 Jun 2023 05:31:32 -0700 (PDT) From: Manivannan Sadhasivam To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, Manivannan Sadhasivam Subject: [PATCH 2/3] MAINTAINERS: Add entry for MHI networking drivers under MHI bus Date: Tue, 6 Jun 2023 18:01:18 +0530 Message-Id: <20230606123119.57499-3-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230606123119.57499-1-manivannan.sadhasivam@linaro.org> References: <20230606123119.57499-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The host MHI net driver was not listed earlier. So let's add both host and endpoint MHI net drivers under MHI bus. Cc: Loic Poulain Signed-off-by: Manivannan Sadhasivam --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index 081eb65ef865..14d9e15ae360 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13632,6 +13632,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/gi= t/mani/mhi.git F: Documentation/ABI/stable/sysfs-bus-mhi F: Documentation/mhi/ F: drivers/bus/mhi/ +F: drivers/net/mhi_* F: include/linux/mhi.h =20 MICROBLAZE ARCHITECTURE --=20 2.25.1 From nobody Mon Feb 9 15:47:59 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66901C7EE24 for ; Tue, 6 Jun 2023 12:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237260AbjFFMbp (ORCPT ); Tue, 6 Jun 2023 08:31:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236845AbjFFMbi (ORCPT ); Tue, 6 Jun 2023 08:31:38 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5C4510C3 for ; Tue, 6 Jun 2023 05:31:36 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id d9443c01a7336-1b02085bf8dso26482875ad.0 for ; Tue, 06 Jun 2023 05:31:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1686054696; x=1688646696; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=fKHi+1QT0DExDdBo5/MSIfvmq1jZp/v5cfToP5Zl7jI=; b=lz9bVSeQuZO2Dz65xSN4KzdfWWXvda+T+V6qFbNZzFvCaBqzsy98S+/UFK5RvyQXoX Jf1cMqD6sNktjlw3smrT7sJ7AKbTzIs2xCjdln7QewQD3jfjZx08Q91NiyWWMSyIW0Ng dm5oQfuB1DKioJ9dqY7LH0pL4vrF3yunupwGpG7h8xS6sel1wHyjqvPp+cHxQEtRbsF2 sArh6I2pYgKY+K99eDGLU9oS0yNBOzOHv1hzEjYXjCv1mPo2kAkLVcEdmBf/Hjc+bKeU PdnSnCEpcNHFfBVtIseKybuqp2VWRHtx7uJOKJDa9dvO6SeCD1TYK7vqcWBRKcDx1gPy +oVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686054696; x=1688646696; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=fKHi+1QT0DExDdBo5/MSIfvmq1jZp/v5cfToP5Zl7jI=; b=VDdx0gDGE3K69d71uowg1G6a4SIhYrhRVRZXeMdWHyLydqayMwo0XUrM9RpAhxV+9i 819axYCxbyErgxfOVIEv1camaQPGTy3j5wKy+R9YvdzCYUnl2vk1fdtcVNxcN/q9vvxA oa7F1AwbuP/iTHiZsyB9UyEPaLB3/9KqE8H2DcUQi8triYUwobYQA64ZpJR38SZTg9L6 YnvF+v1085I0HkkS62WbVFDYorTwVDWTSiF3SPOhVfJ5DrtkKTvpt4Z3EQ1DP24MaWVt fu2tFPBPWr+z1rSRer0KfDxZZ4zIKVp/6SMJ0pQ+GtGjeOMD3gOgUPiyw6XaV+xuLfnx yz+A== X-Gm-Message-State: AC+VfDxybOn4uEZEfjy0sOxPUNq1uOCt2Oc6N9jlUWX3ezgE1MUhlwnc Bd/sqx+JDRrwDqDIxLCDA42E X-Google-Smtp-Source: ACHHUZ68eHLLHb7oc5WpJvUVNzBFwdaMF+eaEVHcDYHteg0CAVXrcrAC7ONGOGNx/9A38WXJjOT/Lg== X-Received: by 2002:a17:902:e850:b0:1b2:436b:931c with SMTP id t16-20020a170902e85000b001b2436b931cmr244061plg.43.1686054696333; Tue, 06 Jun 2023 05:31:36 -0700 (PDT) Received: from localhost.localdomain ([117.202.186.178]) by smtp.gmail.com with ESMTPSA id q5-20020a170902c74500b001ae59169f05sm8446431plq.182.2023.06.06.05.31.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jun 2023 05:31:36 -0700 (PDT) From: Manivannan Sadhasivam To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, Manivannan Sadhasivam Subject: [PATCH 3/3] net: mhi: Increase the default MTU from 16K to 32K Date: Tue, 6 Jun 2023 18:01:19 +0530 Message-Id: <20230606123119.57499-4-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230606123119.57499-1-manivannan.sadhasivam@linaro.org> References: <20230606123119.57499-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Most of the Qualcomm endpoint devices are supporting 32K MTU for the UL (Uplink) and DL (Downlink) channels. So let's use the same value in the MHI NET driver also. This gives almost 2x increase in the throughput for the UL channel. Below is the comparision: iperf on the UL channel with 16K MTU: [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 353 MBytes 296 Mbits/sec iperf on the UL channel with 32K MTU: [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 695 MBytes 583 Mbits/sec Cc: Loic Poulain Signed-off-by: Manivannan Sadhasivam --- drivers/net/mhi_net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c index 3d322ac4f6a5..eddc2c701da4 100644 --- a/drivers/net/mhi_net.c +++ b/drivers/net/mhi_net.c @@ -14,7 +14,7 @@ =20 #define MHI_NET_MIN_MTU ETH_MIN_MTU #define MHI_NET_MAX_MTU 0xffff -#define MHI_NET_DEFAULT_MTU 0x4000 +#define MHI_NET_DEFAULT_MTU 0x8000 =20 struct mhi_net_stats { u64_stats_t rx_packets; --=20 2.25.1