diff mbox series

[net-next,7/8] netdevsim: add debugfs-triggered queue reset

Message ID 20250103185954.1236510-8-kuba@kernel.org (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series net: make sure we retain NAPI ordering on netdev->napi_list | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1 this patch: 1
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 1 maintainers not CCed: andrew+netdev@lunn.ch
netdev/build_clang success Errors and warnings before: 13 this patch: 13
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
netdev/checkpatch fail ERROR: code indent should use tabs where possible WARNING: please, no spaces at the start of a line
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jakub Kicinski Jan. 3, 2025, 6:59 p.m. UTC 
Support triggering queue reset via debugfs for an upcoming test.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/netdevsim/netdev.c    | 55 +++++++++++++++++++++++++++++++
 drivers/net/netdevsim/netdevsim.h |  1 +
 2 files changed, 56 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 86614292314a..65605d2eb943 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/netdev_rx_queue.h>
 #include <net/page_pool/helpers.h>
 #include <net/netlink.h>
 #include <net/net_shaper.h>
@@ -29,6 +30,8 @@ 
 
 #include "netdevsim.h"
 
+MODULE_IMPORT_NS("NETDEV_INTERNAL");
+
 #define NSIM_RING_SIZE		256
 
 static int nsim_napi_rx(struct nsim_rq *rq, struct sk_buff *skb)
@@ -723,6 +726,54 @@  static const struct netdev_queue_mgmt_ops nsim_queue_mgmt_ops = {
 	.ndo_queue_stop		= nsim_queue_stop,
 };
 
+static ssize_t
+nsim_qreset_write(struct file *file, const char __user *data,
+		  size_t count, loff_t *ppos)
+{
+	struct netdevsim *ns = file->private_data;
+	unsigned int queue, mode;
+	char buf[32];
+	ssize_t ret;
+
+	if (count >= sizeof(buf))
+		return -EINVAL;
+	if (copy_from_user(buf, data, count))
+                return -EFAULT;
+        buf[count] = '\0';
+
+	ret = sscanf(buf, "%u %u", &queue, &mode);
+	if (ret != 2)
+		return -EINVAL;
+
+	rtnl_lock();
+	if (!netif_running(ns->netdev)) {
+		ret = -ENETDOWN;
+		goto exit_unlock;
+	}
+
+	if (queue >= ns->netdev->real_num_rx_queues) {
+		ret = -EINVAL;
+		goto exit_unlock;
+	}
+
+	ns->rq_reset_mode = mode;
+	ret = netdev_rx_queue_restart(ns->netdev, queue);
+	ns->rq_reset_mode = 0;
+	if (ret)
+		goto exit_unlock;
+
+	ret = count;
+exit_unlock:
+	rtnl_unlock();
+	return ret;
+}
+
+static const struct file_operations nsim_qreset_fops = {
+	.open = simple_open,
+	.write = nsim_qreset_write,
+	.owner = THIS_MODULE,
+};
+
 static ssize_t
 nsim_pp_hold_read(struct file *file, char __user *data,
 		  size_t count, loff_t *ppos)
@@ -935,6 +986,9 @@  nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
 
 	ns->pp_dfs = debugfs_create_file("pp_hold", 0600, nsim_dev_port->ddir,
 					 ns, &nsim_pp_hold_fops);
+	ns->qr_dfs = debugfs_create_file("queue_reset", 0600,
+					 nsim_dev_port->ddir, ns,
+					 &nsim_qreset_fops);
 
 	return ns;
 
@@ -949,6 +1003,7 @@  void nsim_destroy(struct netdevsim *ns)
 	struct netdevsim *peer;
 
 	debugfs_remove(ns->pp_dfs);
+	debugfs_remove(ns->qr_dfs);
 
 	rtnl_lock();
 	peer = rtnl_dereference(ns->peer);
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 8c50969b1240..a70f62af4c88 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -136,6 +136,7 @@  struct netdevsim {
 
 	struct page *page;
 	struct dentry *pp_dfs;
+	struct dentry *qr_dfs;
 
 	struct nsim_ethtool ethtool;
 	struct netdevsim __rcu *peer;