From patchwork Thu Apr 11 01:28:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jakub Kicinski X-Patchwork-Id: 13625301 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 613D36996E; Thu, 11 Apr 2024 01:28:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712798921; cv=none; b=OLayARxkCw36yxJWTJ8EkGiP3d6um2AR5eIvIwDjg2MNl67oiYF9cYldCSWaJDD6Fd1iEhAvSKNZHqeYMqn8/7wB5O2yanNIvp13YkYFwWNHpGKH/FWywjxOxYjn7kSuBtzgUL3Z/FieyymbQD4jA/naz8O+153+0ULxAgOy4JU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712798921; c=relaxed/simple; bh=OWzNRL9wTAL3ZZ/3fyuNRkKpjlzyc/9bE7pYUM6rX1U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dcaORRjhe1GwgWV1NezKXnf/fk/IobBhlTXffJmEBt2ufTOrvRaPanhiujN2QjWWNRRyWN3ZhZCfwX3hOL2cUzxaD0/wkT/d/DnKXfum9wqjsOEqdqL0bNGBZSLHJunrg2eJGpieHMz7ZTG3UIx6J3mIJ/bHmwKt5k6Usyc0f+c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UERWqJBi; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UERWqJBi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 849BDC43390; Thu, 11 Apr 2024 01:28:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712798920; bh=OWzNRL9wTAL3ZZ/3fyuNRkKpjlzyc/9bE7pYUM6rX1U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UERWqJBi5H8rZNqahKJD6h/+wCu+IgGolpLkrQx8Jnsdg+BkNaoYWr6eLeDLNxeYg iE90uH1Gf6YSW+84gsgylZmXs+IJbJXpZkEHshClIgCCXiYZgb3fl4yFaF1itO8wjO cTor+cBEnhwuMbPDLhQNtOXHwj9eWDvWxXh0i/kdfwooHFcQjQCctE9SGyCHhKjYM8 eU4q1lxlyhepbHzzJFrBTZbRFG8wlmYf2lIzKHRHtybFBVZtHm9My2Tu2zrHTHrvwG batGVPTRw6CMIXfSkDIaAvXxp36Elayzhaf2oBaRsDbjissvaf2/on0DseuInICN57 EAzcI9NXCUD8A== From: Jakub Kicinski To: davem@davemloft.net Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, shuah@kernel.org, petrm@nvidia.com, linux-kselftest@vger.kernel.org, Jakub Kicinski Subject: [PATCH net-next 1/6] net: netdevsim: add some fake page pool use Date: Wed, 10 Apr 2024 18:28:10 -0700 Message-ID: <20240411012815.174400-2-kuba@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240411012815.174400-1-kuba@kernel.org> References: <20240411012815.174400-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add very basic page pool use so that we can exercise the netlink uAPI in a selftest. Page pool gets created on open, destroyed on close. But we control allocating of a single page thru debugfs. This page may survive past the page pool itself so that we can test orphaned page pools. Signed-off-by: Jakub Kicinski --- drivers/net/netdevsim/netdev.c | 93 +++++++++++++++++++++++++++++++ drivers/net/netdevsim/netdevsim.h | 4 ++ 2 files changed, 97 insertions(+) diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index d7ba447db17c..d127856f8f36 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -299,6 +300,29 @@ static int nsim_get_iflink(const struct net_device *dev) return iflink; } +static int nsim_open(struct net_device *dev) +{ + struct netdevsim *ns = netdev_priv(dev); + struct page_pool_params pp = { 0 }; + + pp.pool_size = 128; + pp.dev = &dev->dev; + pp.dma_dir = DMA_BIDIRECTIONAL; + pp.netdev = dev; + + ns->pp = page_pool_create(&pp); + return PTR_ERR_OR_ZERO(ns->pp); +} + +static int nsim_stop(struct net_device *dev) +{ + struct netdevsim *ns = netdev_priv(dev); + + page_pool_destroy(ns->pp); + + return 0; +} + static const struct net_device_ops nsim_netdev_ops = { .ndo_start_xmit = nsim_start_xmit, .ndo_set_rx_mode = nsim_set_rx_mode, @@ -318,6 +342,8 @@ static const struct net_device_ops nsim_netdev_ops = { .ndo_set_features = nsim_set_features, .ndo_get_iflink = nsim_get_iflink, .ndo_bpf = nsim_bpf, + .ndo_open = nsim_open, + .ndo_stop = nsim_stop, }; static const struct net_device_ops nsim_vf_netdev_ops = { @@ -378,6 +404,60 @@ static const struct netdev_stat_ops nsim_stat_ops = { .get_base_stats = nsim_get_base_stats, }; +static ssize_t +nsim_pp_hold_read(struct file *file, char __user *data, + size_t count, loff_t *ppos) +{ + struct netdevsim *ns = file->private_data; + char buf[3] = "n\n"; + + if (ns->page) + buf[0] = 'y'; + + return simple_read_from_buffer(data, count, ppos, buf, 2); +} + +static ssize_t +nsim_pp_hold_write(struct file *file, const char __user *data, + size_t count, loff_t *ppos) +{ + struct netdevsim *ns = file->private_data; + ssize_t ret; + bool val; + + ret = kstrtobool_from_user(data, count, &val); + if (ret) + return ret; + + rtnl_lock(); + ret = count; + if (val == !!ns->page) + goto exit; + + if (!netif_running(ns->netdev) && val) { + ret = -ENETDOWN; + } else if (val) { + ns->page = page_pool_dev_alloc_pages(ns->pp); + if (!ns->page) + ret = -ENOMEM; + } else { + page_pool_put_full_page(ns->page->pp, ns->page, false); + ns->page = NULL; + } + rtnl_unlock(); + +exit: + return count; +} + +static const struct file_operations nsim_pp_hold_fops = { + .open = simple_open, + .read = nsim_pp_hold_read, + .write = nsim_pp_hold_write, + .llseek = generic_file_llseek, + .owner = THIS_MODULE, +}; + static void nsim_setup(struct net_device *dev) { ether_setup(dev); @@ -485,6 +565,10 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port) err = nsim_init_netdevsim_vf(ns); if (err) goto err_free_netdev; + + ns->pp_dfs = debugfs_create_file("pp_hold", 0600, nsim_dev_port->ddir, + ns, &nsim_pp_hold_fops); + return ns; err_free_netdev: @@ -497,6 +581,8 @@ void nsim_destroy(struct netdevsim *ns) struct net_device *dev = ns->netdev; struct netdevsim *peer; + debugfs_remove(ns->pp_dfs); + rtnl_lock(); peer = rtnl_dereference(ns->peer); if (peer) @@ -511,6 +597,13 @@ void nsim_destroy(struct netdevsim *ns) rtnl_unlock(); if (nsim_dev_port_is_pf(ns->nsim_dev_port)) nsim_exit_netdevsim(ns); + + /* Put this intentionally late to exercise the orphaning path */ + if (ns->page) { + page_pool_put_full_page(ns->page->pp, ns->page, false); + ns->page = NULL; + } + free_netdev(dev); } diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index 553c4b9b4f63..7664ab823e29 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -125,6 +125,10 @@ struct netdevsim { struct debugfs_u32_array dfs_ports[2]; } udp_ports; + struct page_pool *pp; + struct page *page; + struct dentry *pp_dfs; + struct nsim_ethtool ethtool; struct netdevsim __rcu *peer; };