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Message-ID: <20240412141436.828666-2-kuba@kernel.org>
Date: Fri, 12 Apr 2024 07:14:31 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
shuah@...nel.org,
petrm@...dia.com,
linux-kselftest@...r.kernel.org,
Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 1/6] net: netdevsim: add some fake page pool use
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 <kuba@...nel.org>
---
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 <linux/netdevice.h>
#include <linux/slab.h>
#include <net/netdev_queues.h>
+#include <net/page_pool/helpers.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/rtnetlink.h>
@@ -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;
};
--
2.44.0
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