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net: drop rtnl_lock for queue_mgmt operations

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All drivers that use queue API are already converted to use
netdev instance lock. Move netdev instance lock management to
the netlink layer and drop rtnl_lock.

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Mina Almasry. <almasrymina@google.com>
Link: https://patch.msgid.link/20250311144026.4154277-4-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stanislav Fomichev 2025-03-11 07:40:26 -07:00 • committed by Jakub Kicinski
parent 10eef096be
commit 1d22d3060b
5 changed files with 18 additions and 23 deletions
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4
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View file

@ -11381,14 +11381,14 @@ static void bnxt_irq_affinity_notify(struct irq_affinity_notify *notify,
if (pcie_tph_set_st_entry(irq->bp->pdev, irq->msix_nr, tag))
return;
rtnl_lock();
netdev_lock(irq->bp->dev);
if (netif_running(irq->bp->dev)) {
err = netdev_rx_queue_restart(irq->bp->dev, irq->ring_nr);
if (err)
netdev_err(irq->bp->dev,
"RX queue restart failed: err=%d\n", err);
}
rtnl_unlock();
netdev_unlock(irq->bp->dev);
}
static void bnxt_irq_affinity_release(struct kref *ref)

4
drivers/net/netdevsim/netdev.c
View file

@ -787,7 +787,7 @@ nsim_qreset_write(struct file *file, const char __user *data,
if (ret != 2)
return -EINVAL;
rtnl_lock();
netdev_lock(ns->netdev);
if (queue >= ns->netdev->real_num_rx_queues) {
ret = -EINVAL;
goto exit_unlock;
@ -801,7 +801,7 @@ nsim_qreset_write(struct file *file, const char __user *data,
ret = count;
exit_unlock:
rtnl_unlock();
netdev_unlock(ns->netdev);
return ret;
}

4
net/core/devmem.c
View file

@ -25,7 +25,6 @@
/* Device memory support */
/* Protected by rtnl_lock() */
static DEFINE_XARRAY_FLAGS(net_devmem_dmabuf_bindings, XA_FLAGS_ALLOC1);
static const struct memory_provider_ops dmabuf_devmem_ops;
@ -128,9 +127,10 @@ void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding)
rxq->mp_params.mp_priv = NULL;
rxq->mp_params.mp_ops = NULL;
netdev_lock(binding->dev);
rxq_idx = get_netdev_rx_queue_index(rxq);
WARN_ON(netdev_rx_queue_restart(binding->dev, rxq_idx));
netdev_unlock(binding->dev);
}
xa_erase(&net_devmem_dmabuf_bindings, binding->id);

13
net/core/netdev-genl.c
View file

@ -860,12 +860,11 @@ int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
}
mutex_lock(&priv->lock);
rtnl_lock();
netdev = __dev_get_by_index(genl_info_net(info), ifindex);
netdev = netdev_get_by_index_lock(genl_info_net(info), ifindex);
if (!netdev || !netif_device_present(netdev)) {
err = -ENODEV;
goto err_unlock;
goto err_unlock_sock;
}
if (dev_xdp_prog_count(netdev)) {
@ -918,7 +917,8 @@ int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
if (err)
goto err_unbind;
rtnl_unlock();
netdev_unlock(netdev);
mutex_unlock(&priv->lock);
return 0;
@ -926,7 +926,8 @@ int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
err_unbind:
net_devmem_unbind_dmabuf(binding);
err_unlock:
rtnl_unlock();
netdev_unlock(netdev);
err_unlock_sock:
mutex_unlock(&priv->lock);
err_genlmsg_free:
nlmsg_free(rsp);
@ -946,9 +947,7 @@ void netdev_nl_sock_priv_destroy(struct netdev_nl_sock *priv)
mutex_lock(&priv->lock);
list_for_each_entry_safe(binding, temp, &priv->bindings, list) {
rtnl_lock();
net_devmem_unbind_dmabuf(binding);
rtnl_unlock();
}
mutex_unlock(&priv->lock);
}

16
net/core/netdev_rx_queue.c
View file

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/netdevice.h>
#include <net/netdev_lock.h>
#include <net/netdev_queues.h>
#include <net/netdev_rx_queue.h>
#include <net/page_pool/memory_provider.h>
@ -18,7 +19,7 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx)
!qops->ndo_queue_mem_alloc || !qops->ndo_queue_start)
return -EOPNOTSUPP;
ASSERT_RTNL();
netdev_assert_locked(dev);
new_mem = kvzalloc(qops->ndo_queue_mem_size, GFP_KERNEL);
if (!new_mem)
@ -30,8 +31,6 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx)
goto err_free_new_mem;
}
netdev_lock(dev);
err = qops->ndo_queue_mem_alloc(dev, new_mem, rxq_idx);
if (err)
goto err_free_old_mem;
@ -54,8 +53,6 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx)
qops->ndo_queue_mem_free(dev, old_mem);
netdev_unlock(dev);
kvfree(old_mem);
kvfree(new_mem);
@ -80,7 +77,6 @@ err_free_new_queue_mem:
qops->ndo_queue_mem_free(dev, new_mem);
err_free_old_mem:
netdev_unlock(dev);
kvfree(old_mem);
err_free_new_mem:
@ -118,9 +114,9 @@ int net_mp_open_rxq(struct net_device *dev, unsigned ifq_idx,
{
int ret;
rtnl_lock();
netdev_lock(dev);
ret = __net_mp_open_rxq(dev, ifq_idx, p);
rtnl_unlock();
netdev_unlock(dev);
return ret;
}
@ -153,7 +149,7 @@ static void __net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx,
void net_mp_close_rxq(struct net_device *dev, unsigned ifq_idx,
struct pp_memory_provider_params *old_p)
{
rtnl_lock();
netdev_lock(dev);
__net_mp_close_rxq(dev, ifq_idx, old_p);
rtnl_unlock();
netdev_unlock(dev);
}