netdev - Re: [PATCH rdma-next 1/1] RDMA/mana_ib: Set correct device into ib

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Date: Wed, 26 Jun 2024 08:47:48 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Konstantin Taranov <kotaranov@...ux.microsoft.com>
Cc: kotaranov@...rosoft.com, weh@...rosoft.com, sharmaajay@...rosoft.com,
	longli@...rosoft.com, jgg@...pe.ca, linux-rdma@...r.kernel.org,
	linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next 1/1] RDMA/mana_ib: Set correct device into ib

On Tue, Jun 25, 2024 at 03:28:27AM -0700, Konstantin Taranov wrote:
> From: Konstantin Taranov <kotaranov@...rosoft.com>
> 
> When mc->ports[0] is not slave, use it in the set_netdev.
> When mana is used in netvsc, the stored net devices in mana
> are slaves and GIDs should be taken from their master devices.
> In the baremetal case, the mc->ports devices will not be slaves.

I wonder, why do you have "... | IFF_SLAVE" in __netvsc_vf_setup() in a
first place? Isn't IFF_SLAVE is supposed to be set by bond driver?

> 
> Fixes: 8b184e4f1c32 ("RDMA/mana_ib: Enable RoCE on port 1")
> Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
> ---
>  drivers/infiniband/hw/mana/device.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mana/device.c b/drivers/infiniband/hw/mana/device.c
> index b07a8e2e838f..5395306a86e8 100644
> --- a/drivers/infiniband/hw/mana/device.c
> +++ b/drivers/infiniband/hw/mana/device.c
> @@ -11,6 +11,8 @@ MODULE_DESCRIPTION("Microsoft Azure Network Adapter IB driver");
>  MODULE_LICENSE("GPL");
>  MODULE_IMPORT_NS(NET_MANA);
>  
> +#define mana_ndev_is_slave(dev)   (((dev)->flags & IFF_SLAVE) == IFF_SLAVE)

There is no need in macro for one line of code and there is no need in "==",
as the result will be boolean.

> +
>  static const struct ib_device_ops mana_ib_dev_ops = {
>  	.owner = THIS_MODULE,
>  	.driver_id = RDMA_DRIVER_MANA,
> @@ -56,7 +58,7 @@ static int mana_ib_probe(struct auxiliary_device *adev,
>  {
>  	struct mana_adev *madev = container_of(adev, struct mana_adev, adev);
>  	struct gdma_dev *mdev = madev->mdev;
> -	struct net_device *upper_ndev;
> +	struct net_device *ndev;
>  	struct mana_context *mc;
>  	struct mana_ib_dev *dev;
>  	u8 mac_addr[ETH_ALEN];
> @@ -85,16 +87,19 @@ static int mana_ib_probe(struct auxiliary_device *adev,
>  	dev->ib_dev.dev.parent = mdev->gdma_context->dev;
>  
>  	rcu_read_lock(); /* required to get upper dev */
> -	upper_ndev = netdev_master_upper_dev_get_rcu(mc->ports[0]);
> -	if (!upper_ndev) {
> +	if (mana_ndev_is_slave(mc->ports[0]))
> +		ndev = netdev_master_upper_dev_get_rcu(mc->ports[0]);
> +	else
> +		ndev = mc->ports[0];
> +	if (!ndev) {
>  		rcu_read_unlock();
>  		ret = -ENODEV;
> -		ibdev_err(&dev->ib_dev, "Failed to get master netdev");
> +		ibdev_err(&dev->ib_dev, "Failed to get netdev for port 1");
>  		goto free_ib_device;
>  	}
> -	ether_addr_copy(mac_addr, upper_ndev->dev_addr);
> -	addrconf_addr_eui48((u8 *)&dev->ib_dev.node_guid, upper_ndev->dev_addr);
> -	ret = ib_device_set_netdev(&dev->ib_dev, upper_ndev, 1);
> +	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();
>  	if (ret) {
>  		ibdev_err(&dev->ib_dev, "Failed to set ib netdev, ret %d", ret);
> -- 
> 2.43.0
> 
>