From patchwork Sat Feb 6 12:55:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Parav Pandit X-Patchwork-Id: 12072127 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 4E32BC43381 for ; Sat, 6 Feb 2021 12:57:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B35164E36 for ; Sat, 6 Feb 2021 12:57:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230012AbhBFM4z (ORCPT ); Sat, 6 Feb 2021 07:56:55 -0500 Received: from hqnvemgate25.nvidia.com ([216.228.121.64]:8376 "EHLO hqnvemgate25.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229631AbhBFM4t (ORCPT ); Sat, 6 Feb 2021 07:56:49 -0500 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Sat, 06 Feb 2021 04:56:06 -0800 Received: from sw-mtx-036.mtx.labs.mlnx (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Sat, 6 Feb 2021 12:56:05 +0000 From: Parav Pandit To: , , CC: Parav Pandit , Jiri Pirko Subject: [PATCH net-next 2/7] netdevsim: Add support for add and delete PCI SF port Date: Sat, 6 Feb 2021 14:55:46 +0200 Message-ID: <20210206125551.8616-3-parav@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210206125551.8616-1-parav@nvidia.com> References: <20210206125551.8616-1-parav@nvidia.com> MIME-Version: 1.0 X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1612616166; bh=Ret9lYALPKks/V4BqhFsex1k75Jlh0yNe5y5vJfFZx0=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding:Content-Type: X-Originating-IP:X-ClientProxiedBy; b=gT5VZQ3l9pcJgWVDBTlsKchKDLIpLnctKCWtm28zpR3mdEjwxXY6CsHwmDHwCCd+j MOOsnpf9lR4dseEovOTIsAe+0uS9zeHk3MFK1NF70GJK5zi9UaH3hkGfJgJbWPYYj5 e0JSJkbryj05vTkBhV8k4nk0NhXHOxuyamdkHBuBJPzxnXm7xL3vTh/rpTBTCPl4Ff y0siMeVnUQ67sNhY54D7Da8RmbtCTAMNrDiWVCFtBkePuoSrB4KTyCVp7NhDMl2h/h 0712rSLcQkkyLCf0OdlW18OvcHNFmZxPWrAJJE3Of2gifop2Ty9ZI1il5f50qWs71n 07FnKHOa76IQQ== Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Simulate PCI SF ports. Allow user to create one or more PCI SF ports. Examples: echo "10 1" > /sys/bus/netdevsim/new_device Add PCI PF port: $ devlink port add netdevsim/netdevsim10 flavour pcipf pfnum 2 netdevsim/netdevsim10/1: type eth netdev eth1 flavour pcipf controller 0 pfnum 2 external false splittable false Add PCI SF port where port index and sfnum are auto assigned by driver. $ devlink port add netdevsim/netdevsim10 flavour pcisf pfnum 2 netdevsim/netdevsim10/2: type eth netdev eth2 flavour pcisf controller 0 pfnum 2 sfnum 0 splittable false Show devlink ports: $ devlink port show netdevsim/netdevsim10/0: type eth netdev eth0 flavour physical port 1 splittable false netdevsim/netdevsim10/1: type eth netdev eth1 flavour pcipf controller 0 pfnum 2 external false splittable false netdevsim/netdevsim10/2: type eth netdev eth2 flavour pcisf controller 0 pfnum 2 sfnum 0 splittable false Create a PCI SF port whose port index and SF number are assigned by the user. $ devlink port add netdevsim/netdevsim10/66 flavour pcisf pfnum 2 sfnum 66 netdevsim/netdevsim10/66: type eth netdev eth3 flavour pcisf controller 0 pfnum 2 sfnum 66 splittable false Delete PCI SF and PF ports: $ devlink port del netdevsim/netdevsim10/66 $ devlink port del netdevsim/netdevsim10/2 $ devlink port del netdevsim/netdevsim10/1 Signed-off-by: Parav Pandit Reviewed-by: Jiri Pirko Reported-by: kernel test robot --- drivers/net/netdevsim/netdevsim.h | 1 + drivers/net/netdevsim/port_function.c | 99 ++++++++++++++++++++++++++- 2 files changed, 97 insertions(+), 3 deletions(-) diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index 31beddede0f2..efa7c08d842a 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -233,6 +233,7 @@ struct nsim_dev { struct list_head head; struct ida ida; struct ida pfnum_ida; + struct ida sfnum_ida; struct mutex disable_mutex; /* protects port deletion * by driver unload context */ diff --git a/drivers/net/netdevsim/port_function.c b/drivers/net/netdevsim/port_function.c index a957b754ef92..a2f62a609e9b 100644 --- a/drivers/net/netdevsim/port_function.c +++ b/drivers/net/netdevsim/port_function.c @@ -9,9 +9,12 @@ struct nsim_port_fn { struct devlink_port dl_port; struct net_device *netdev; + struct nsim_port_fn *pf_pfn; struct list_head list; unsigned int port_index; enum devlink_port_flavour flavour; + int refcount; /* Counts how many sf ports are bound attached to this pf port. */ + u32 sfnum; u16 pfnum; }; @@ -91,9 +94,24 @@ nsim_devlink_port_fn_alloc(struct nsim_dev *dev, goto fn_ida_err; port->pfnum = ret; break; + case DEVLINK_PORT_FLAVOUR_PCI_SF: + if (attrs->sfnum_valid) + ret = ida_alloc_range(&dev->port_functions.sfnum_ida, attrs->sfnum, + attrs->sfnum, GFP_KERNEL); + else + ret = ida_alloc(&dev->port_functions.sfnum_ida, GFP_KERNEL); + if (ret < 0) + goto fn_ida_err; + port->sfnum = ret; + port->pfnum = attrs->pfnum; + break; default: break; } + /* refcount_t is not needed as port is protected by port_functions.mutex. + * This count is to keep track of how many SF ports are attached a PF port. + */ + port->refcount = 1; return port; fn_ida_err: @@ -110,6 +128,9 @@ nsim_devlink_port_fn_free(struct nsim_dev *dev, struct nsim_port_fn *port) case DEVLINK_PORT_FLAVOUR_PCI_PF: ida_simple_remove(&dev->port_functions.pfnum_ida, port->pfnum); break; + case DEVLINK_PORT_FLAVOUR_PCI_SF: + ida_simple_remove(&dev->port_functions.sfnum_ida, port->sfnum); + break; default: break; } @@ -139,6 +160,12 @@ nsim_dev_port_port_exists(struct nsim_dev *nsim_dev, tmp->flavour == DEVLINK_PORT_FLAVOUR_PCI_PF && tmp->pfnum == attrs->pfnum) return true; + + if (attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_SF && + tmp->flavour == DEVLINK_PORT_FLAVOUR_PCI_SF && + attrs->sfnum_valid && + tmp->sfnum == attrs->sfnum && tmp->pfnum == attrs->pfnum) + return true; } return false; } @@ -153,20 +180,72 @@ nsim_dev_devlink_port_index_lookup(const struct nsim_dev *nsim_dev, list_for_each_entry(port, &nsim_dev->port_functions.head, list) { if (port->port_index != port_index) continue; + if (port->refcount > 1) { + NL_SET_ERR_MSG_MOD(extack, "Port is in use"); + return ERR_PTR(-EBUSY); + } return port; } NL_SET_ERR_MSG_MOD(extack, "User created port not found"); return ERR_PTR(-ENOENT); } +static struct nsim_port_fn * +pf_port_get(struct nsim_dev *nsim_dev, struct nsim_port_fn *port) +{ + struct nsim_port_fn *tmp; + + /* PF port addition doesn't need a parent. */ + if (port->flavour == DEVLINK_PORT_FLAVOUR_PCI_PF) + return NULL; + + list_for_each_entry(tmp, &nsim_dev->port_functions.head, list) { + if (tmp->flavour != DEVLINK_PORT_FLAVOUR_PCI_PF || + tmp->pfnum != port->pfnum) + continue; + + if (tmp->refcount + 1 == INT_MAX) + return ERR_PTR(-ENOSPC); + + port->pf_pfn = tmp; + tmp->refcount++; + return tmp; + } + return ERR_PTR(-ENOENT); +} + +static void pf_port_put(struct nsim_port_fn *port) +{ + if (port->pf_pfn) { + port->pf_pfn->refcount--; + WARN_ON(port->pf_pfn->refcount < 0); + } + port->refcount--; + WARN_ON(port->refcount != 0); +} + static int nsim_devlink_port_fn_add(struct devlink *devlink, struct nsim_dev *nsim_dev, struct nsim_port_fn *port, struct netlink_ext_ack *extack) { + struct nsim_port_fn *pf_pfn; int err; - list_add(&port->list, &nsim_dev->port_functions.head); + /* Keep all PF ports at the start, so that when driver is unloaded + * All SF ports from the end of the list can be removed first. + */ + if (port->flavour == DEVLINK_PORT_FLAVOUR_PCI_PF) + list_add(&port->list, &nsim_dev->port_functions.head); + else + list_add_tail(&port->list, &nsim_dev->port_functions.head); + + pf_pfn = pf_port_get(nsim_dev, port); + if (IS_ERR(pf_pfn)) { + NL_SET_ERR_MSG_MOD(extack, "Fail to get pf port"); + err = PTR_ERR(pf_pfn); + goto pf_err; + } err = devlink_port_register(devlink, &port->dl_port, port->port_index); if (err) @@ -183,6 +262,8 @@ static int nsim_devlink_port_fn_add(struct devlink *devlink, devlink_port_type_clear(&port->dl_port); devlink_port_unregister(&port->dl_port); reg_err: + pf_port_put(port); +pf_err: list_del(&port->list); return err; } @@ -194,13 +275,15 @@ static void nsim_devlink_port_fn_del(struct nsim_dev *nsim_dev, unregister_netdev(port->netdev); devlink_port_unregister(&port->dl_port); list_del(&port->list); + pf_port_put(port); } static bool nsim_dev_port_flavour_supported(const struct nsim_dev *nsim_dev, const struct devlink_port_new_attrs *attrs) { - return attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_PF; + return attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_PF || + attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_SF; } int nsim_dev_devlink_port_new(struct devlink *devlink, @@ -245,7 +328,12 @@ int nsim_dev_devlink_port_new(struct devlink *devlink, nsim_dev->switch_id.id_len); port->dl_port.attrs.switch_id.id_len = nsim_dev->switch_id.id_len; - devlink_port_attrs_pci_pf_set(&port->dl_port, 0, port->pfnum, false); + if (attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_PF) + devlink_port_attrs_pci_pf_set(&port->dl_port, 0, + port->pfnum, false); + else + devlink_port_attrs_pci_sf_set(&port->dl_port, 0, port->pfnum, + port->sfnum); err = nsim_devlink_port_fn_add(devlink, nsim_dev, port, extack); if (err) @@ -300,10 +388,13 @@ void nsim_dev_port_fn_init(struct nsim_dev *nsim_dev) INIT_LIST_HEAD(&nsim_dev->port_functions.head); ida_init(&nsim_dev->port_functions.ida); ida_init(&nsim_dev->port_functions.pfnum_ida); + ida_init(&nsim_dev->port_functions.sfnum_ida); } void nsim_dev_port_fn_exit(struct nsim_dev *nsim_dev) { + WARN_ON(!ida_is_empty(&nsim_dev->port_functions.sfnum_ida)); + ida_destroy(&nsim_dev->port_functions.sfnum_ida); WARN_ON(!ida_is_empty(&nsim_dev->port_functions.pfnum_ida)); ida_destroy(&nsim_dev->port_functions.pfnum_ida); WARN_ON(!ida_is_empty(&nsim_dev->port_functions.ida)); @@ -332,6 +423,8 @@ void nsim_dev_port_fn_disable(struct nsim_dev *nsim_dev) * commands have completed, so it is safe to delete all user created * ports. */ + + /* Remove SF ports first, followed by PF ports. */ list_for_each_entry_safe_reverse(port, tmp, &nsim_dev->port_functions.head, list) { nsim_devlink_port_fn_del(nsim_dev, port);