{net,vdpa}/mlx5: Configure interface MAC into mpfs L2 table

net/mlx5: Expose MPFS configuration API

MPFS is the multi physical function switch that bridges traffic between
the physical port and any physical functions associated with it. The
driver is required to add or remove MAC entries to properly forward
incoming traffic to the correct physical function.

We export the API to control MPFS so that other drivers, such as
mlx5_vdpa are able to add MAC addresses of their network interfaces.

The MAC address of the vdpa interface must be configured into the MPFS L2
address. Failing to do so could cause, in some NIC configurations, failure
to forward packets to the vdpa network device instance.

Fix this by adding calls to update the MPFS table.

CC: <[e-mail]>
CC: <[e-mail]>
CC: <[e-mail]>
Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
Signed-off-by: Eli Cohen <[e-mail]>
Signed-off-by: Saeed Mahameed <[e-mail]>

drivers/net/ethernet/mellanox/mlx5/core/en_fs.c

···
 #include <linux/ipv6.h>
 #include <linux/tcp.h>
 #include <linux/mlx5/fs.h>
+#include <linux/mlx5/mpfs.h>
 #include "en.h"
 #include "en_rep.h"
 #include "lib/mpfs.h"

drivers/net/ethernet/mellanox/mlx5/core/eswitch.c

···
 #include <linux/mlx5/mlx5_ifc.h>
 #include <linux/mlx5/vport.h>
 #include <linux/mlx5/fs.h>
+#include <linux/mlx5/mpfs.h>
 #include "esw/acl/lgcy.h"
 #include "esw/legacy.h"
 #include "mlx5_core.h"

drivers/net/ethernet/mellanox/mlx5/core/lib/mpfs.c

···
 #include <linux/etherdevice.h>
 #include <linux/mlx5/driver.h>
 #include <linux/mlx5/mlx5_ifc.h>
+#include <linux/mlx5/mpfs.h>
 #include <linux/mlx5/eswitch.h>
 #include "mlx5_core.h"
 #include "lib/mpfs.h"
···
 	mutex_unlock(&mpfs->lock);
 	return err;
 }
+EXPORT_SYMBOL(mlx5_mpfs_add_mac);
 
 int mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac)
 {
···
 	mutex_unlock(&mpfs->lock);
 	return err;
 }
+EXPORT_SYMBOL(mlx5_mpfs_del_mac);

drivers/net/ethernet/mellanox/mlx5/core/lib/mpfs.h

···
 #ifdef CONFIG_MLX5_MPFS
 int  mlx5_mpfs_init(struct mlx5_core_dev *dev);
 void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev);
-int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac);
-int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac);
 #else /* #ifndef CONFIG_MLX5_MPFS */
 static inline int  mlx5_mpfs_init(struct mlx5_core_dev *dev) { return 0; }
 static inline void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev) {}
-static inline int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
-static inline int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
 #endif
+
 #endif

drivers/vdpa/mlx5/net/mlx5_vnet.c

···
 #include <linux/mlx5/vport.h>
 #include <linux/mlx5/fs.h>
 #include <linux/mlx5/mlx5_ifc_vdpa.h>
+#include <linux/mlx5/mpfs.h>
 #include "mlx5_vdpa.h"
 
 MODULE_AUTHOR("Eli Cohen <[e-mail]>");
···
 static void mlx5_vdpa_free(struct vdpa_device *vdev)
 {
 	struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
+	struct mlx5_core_dev *pfmdev;
 	struct mlx5_vdpa_net *ndev;
 
 	ndev = to_mlx5_vdpa_ndev(mvdev);
 
 	free_resources(ndev);
+	if (!is_zero_ether_addr(ndev->config.mac)) {
+		pfmdev = pci_get_drvdata(pci_physfn(mvdev->mdev->pdev));
+		mlx5_mpfs_del_mac(pfmdev, ndev->config.mac);
+	}
 	mlx5_vdpa_free_resources(&ndev->mvdev);
 	mutex_destroy(&ndev->reslock);
 }
···
 {
 	struct mlx5_vdpa_mgmtdev *mgtdev = container_of(v_mdev, struct mlx5_vdpa_mgmtdev, mgtdev);
 	struct virtio_net_config *config;
+	struct mlx5_core_dev *pfmdev;
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
 	struct mlx5_core_dev *mdev;
···
 	if (err)
 		goto err_mtu;
 
+	if (!is_zero_ether_addr(config->mac)) {
+		pfmdev = pci_get_drvdata(pci_physfn(mdev->pdev));
+		err = mlx5_mpfs_add_mac(pfmdev, config->mac);
+		if (err)
+			goto err_mtu;
+	}
+
 	mvdev->vdev.dma_dev = mdev->device;
 	err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
 	if (err)
-		goto err_mtu;
+		goto err_mpfs;
 
 	err = alloc_resources(ndev);
 	if (err)
···
 	free_resources(ndev);
 err_res:
 	mlx5_vdpa_free_resources(&ndev->mvdev);
+err_mpfs:
+	if (!is_zero_ether_addr(config->mac))
+		mlx5_mpfs_del_mac(pfmdev, config->mac);
 err_mtu:
 	mutex_destroy(&ndev->reslock);
 	put_device(&mvdev->vdev.dev);

include/linux/mlx5/mpfs.h

···
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+ * Copyright (c) 2021 Mellanox Technologies Ltd.
+ */
+
+#ifndef _MLX5_MPFS_
+#define _MLX5_MPFS_
+
+struct mlx5_core_dev;
+
+#ifdef CONFIG_MLX5_MPFS
+int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac);
+int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac);
+#else /* #ifndef CONFIG_MLX5_MPFS */
+static inline int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
+static inline int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
+#endif
+
+#endif