From: Long Li <lon...@microsoft.com>
Change mana_get_primary_netdev_rcu() to mana_get_primary_netdev(), and
return the ndev with refcount held. The caller is responsible for dropping
the refcount.
Also drop the check for IFF_SLAVE as it is not necessary if the upper
device is present.
Signed-off-by: Long Li <lon...@microsoft.com>
---
Changes
v4: use netdev_hold()/netdev_put() and remove the check for IFF_SLAVE
v5: use netdevice_tracker in mana_ib_dev for netdev_hold()/netdev_put()
v6: rebase to latest rdma-next
drivers/infiniband/hw/mana/device.c | 7 +++---
drivers/infiniband/hw/mana/mana_ib.h | 1 +
drivers/net/ethernet/microsoft/mana/mana_en.c | 22 ++++++++++++-------
include/net/mana/mana.h | 4 +++-
4 files changed, 21 insertions(+), 13 deletions(-)
diff --git a/drivers/infiniband/hw/mana/device.c
b/drivers/infiniband/hw/mana/device.c
index d1a02c54a236..9357a9845c2c 100644
--- a/drivers/infiniband/hw/mana/device.c
+++ b/drivers/infiniband/hw/mana/device.c
@@ -98,10 +98,8 @@ static int mana_ib_probe(struct auxiliary_device *adev,
dev->ib_dev.num_comp_vectors = mdev->gdma_context->max_num_queues;
dev->ib_dev.dev.parent = mdev->gdma_context->dev;
- rcu_read_lock(); /* required to get primary netdev */
- ndev = mana_get_primary_netdev_rcu(mc, 0);
+ ndev = mana_get_primary_netdev(mc, 0, &dev->dev_tracker);
if (!ndev) {
- rcu_read_unlock();
ret = -ENODEV;
ibdev_err(&dev->ib_dev, "Failed to get netdev for IB port 1");
goto free_ib_device;
@@ -109,7 +107,8 @@ static int mana_ib_probe(struct auxiliary_device *adev,
ether_addr_copy(mac_addr, ndev->dev_addr);
addrconf_addr_eui48((u8 *)&dev->ib_dev.node_guid, ndev->dev_addr);
ret = ib_device_set_netdev(&dev->ib_dev, ndev, 1);
- rcu_read_unlock();
+ /* mana_get_primary_netdev() returns ndev with refcount held */
+ netdev_put(ndev, &dev->dev_tracker);
if (ret) {
ibdev_err(&dev->ib_dev, "Failed to set ib netdev, ret %d", ret);
goto free_ib_device;
diff --git a/drivers/infiniband/hw/mana/mana_ib.h
b/drivers/infiniband/hw/mana/mana_ib.h
index 77fc1032eda8..81a7e7474462 100644
--- a/drivers/infiniband/hw/mana/mana_ib.h
+++ b/drivers/infiniband/hw/mana/mana_ib.h
@@ -78,6 +78,7 @@ struct mana_ib_dev {
struct xarray qp_table_wq;
struct mana_ib_adapter_caps adapter_caps;
struct dma_pool *av_pool;
+ netdevice_tracker dev_tracker;
};
struct mana_ib_wq {
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c
b/drivers/net/ethernet/microsoft/mana/mana_en.c
index aa1e47233fe5..4e870b11f946 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -3131,21 +3131,27 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
kfree(ac);
}
-struct net_device *mana_get_primary_netdev_rcu(struct mana_context *ac, u32
port_index)
+struct net_device *mana_get_primary_netdev(struct mana_context *ac,
+ u32 port_index,
+ netdevice_tracker *tracker)
{
struct net_device *ndev;
- RCU_LOCKDEP_WARN(!rcu_read_lock_held(),
- "Taking primary netdev without holding the RCU read
lock");
if (port_index >= ac->num_ports)
return NULL;
- /* When mana is used in netvsc, the upper netdevice should be returned.
*/
- if (ac->ports[port_index]->flags & IFF_SLAVE)
- ndev = netdev_master_upper_dev_get_rcu(ac->ports[port_index]);
- else
+ rcu_read_lock();
+
+ /* If mana is used in netvsc, the upper netdevice should be returned. */
+ ndev = netdev_master_upper_dev_get_rcu(ac->ports[port_index]);
+
+ /* If there is no upper device, use the parent Ethernet device */
+ if (!ndev)
ndev = ac->ports[port_index];
+ netdev_hold(ndev, tracker, GFP_ATOMIC);
+ rcu_read_unlock();
+
return ndev;
}
-EXPORT_SYMBOL_NS(mana_get_primary_netdev_rcu, "NET_MANA");
+EXPORT_SYMBOL_NS(mana_get_primary_netdev, "NET_MANA");
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 0d00b24eacaf..0f78065de8fe 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -827,5 +827,7 @@ int mana_cfg_vport(struct mana_port_context *apc, u32
protection_dom_id,
u32 doorbell_pg_id);
void mana_uncfg_vport(struct mana_port_context *apc);
-struct net_device *mana_get_primary_netdev_rcu(struct mana_context *ac, u32
port_index);
+struct net_device *mana_get_primary_netdev(struct mana_context *ac,
+ u32 port_index,
+ netdevice_tracker *tracker);
#endif /* _MANA_H */
--
2.34.1
