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net/mlx5e: add op for getting netdev DMA device

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For zero-copy (devmem, io_uring), the netdev DMA device used
is the parent device of the net device. However that is not
always accurate for mlx5 devices:
- SFs: The parent device is an auxdev.
- Multi-PF netdevs: The DMA device should be determined by
  the queue.

This change implements the DMA device queue API that returns the DMA
device appropriately for all cases.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20250827144017.1529208-6-dtatulea@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dragos Tatulea
2025-08-27 17:39:58 +03:00
committed by Jakub Kicinski
parent 7c7e94603a
commit f1debf1a2e
1 changed files with 24 additions and 0 deletions
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24
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@@ -5625,12 +5625,36 @@ static int mlx5e_queue_start(struct net_device *dev, void *newq,
return 0;
}
static struct device *mlx5e_queue_get_dma_dev(struct net_device *dev,
int queue_index)
{
struct mlx5e_priv *priv = netdev_priv(dev);
struct mlx5e_channels *channels;
struct device *pdev = NULL;
struct mlx5e_channel *ch;
channels = &priv->channels;
mutex_lock(&priv->state_lock);
if (queue_index >= channels->num)
goto out;
ch = channels->c[queue_index];
pdev = ch->pdev;
out:
mutex_unlock(&priv->state_lock);
return pdev;
}
static const struct netdev_queue_mgmt_ops mlx5e_queue_mgmt_ops = {
.ndo_queue_mem_size = sizeof(struct mlx5_qmgmt_data),
.ndo_queue_mem_alloc = mlx5e_queue_mem_alloc,
.ndo_queue_mem_free = mlx5e_queue_mem_free,
.ndo_queue_start = mlx5e_queue_start,
.ndo_queue_stop = mlx5e_queue_stop,
.ndo_queue_get_dma_dev = mlx5e_queue_get_dma_dev,
};
static void mlx5e_build_nic_netdev(struct net_device *netdev)