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Date: Mon, 4 Mar 2019 16:45:15 +0000
From: Parav Pandit <parav@...lanox.com>
To: Saeed Mahameed <saeedm@...lanox.com>,
Jiri Pirko <jiri@...lanox.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"michal.lkml@...kovi.net" <michal.lkml@...kovi.net>
Subject: RE: [RFC net-next 8/8] net/mlx5: Add subdev driver to bind to subdev
devices
Hi Saeed,
> -----Original Message-----
> From: Saeed Mahameed
> Sent: Friday, March 1, 2019 4:12 PM
> To: Jiri Pirko <jiri@...lanox.com>; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; Parav Pandit <parav@...lanox.com>;
> davem@...emloft.net; gregkh@...uxfoundation.org;
> michal.lkml@...kovi.net
> Subject: Re: [RFC net-next 8/8] net/mlx5: Add subdev driver to bind to
> subdev devices
>
> On Thu, 2019-02-28 at 23:37 -0600, Parav Pandit wrote:
> > Add a subdev driver to probe the subdev devices and create fake
> > netdevice for it.
> >
> > Signed-off-by: Parav Pandit <parav@...lanox.com>
> > ---
> > drivers/net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
> > drivers/net/ethernet/mellanox/mlx5/core/main.c | 8 +-
> > .../net/ethernet/mellanox/mlx5/core/mlx5_core.h | 3 +
> > .../ethernet/mellanox/mlx5/core/subdev_driver.c | 93
> > ++++++++++++++++++++++
> > 4 files changed, 104 insertions(+), 2 deletions(-) create mode
> > 100644 drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> > b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> > index f218789..c8aeaf1 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> > @@ -16,7 +16,7 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o
> > eq.o uar.o pagealloc.o \
> > transobj.o vport.o sriov.o fs_cmd.o fs_core.o \
> > fs_counters.o rl.o lag.o dev.o events.o wq.o lib/gid.o \
> > lib/devcom.o diag/fs_tracepoint.o diag/fw_tracer.o
> > -mlx5_core-$(CONFIG_SUBDEV) += subdev.o
> > +mlx5_core-$(CONFIG_SUBDEV) += subdev.o subdev_driver.o
> >
> > #
> > # Netdev basic
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > index 5f8cf0d..7dfa8c4 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > @@ -1548,7 +1548,11 @@ static int __init init(void)
> > mlx5e_init();
> > #endif
> >
> > - return 0;
> > + err = subdev_register_driver(&mlx5_subdev_driver);
> > + if (err)
> > + pci_unregister_driver(&mlx5_core_driver);
> > +
> > + return err;
> >
> > err_debug:
> > mlx5_unregister_debugfs();
> > @@ -1557,6 +1561,8 @@ static int __init init(void)
> >
> > static void __exit cleanup(void)
> > {
> > + subdev_unregister_driver(&mlx5_subdev_driver);
> > +
> > #ifdef CONFIG_MLX5_CORE_EN
> > mlx5e_cleanup();
> > #endif
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
> > b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
> > index 2a54148..1b733c7 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
> > @@ -41,12 +41,15 @@
> > #include <linux/ptp_clock_kernel.h>
> > #include <linux/mlx5/cq.h>
> > #include <linux/mlx5/fs.h>
> > +#include <linux/subdev_bus.h>
> >
> > #define DRIVER_NAME "mlx5_core"
> > #define DRIVER_VERSION "5.0-0"
> >
> > extern uint mlx5_core_debug_mask;
> >
> > +extern struct subdev_driver mlx5_subdev_driver;
> > +
> > #define mlx5_core_dbg(__dev, format, ...)
> > \
> > dev_dbg(&(__dev)->pdev->dev, "%s:%d:(pid %d): " format,
>
> > \
> > __func__, __LINE__, current->pid,
> > \
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
> > new file mode 100644
> > index 0000000..880aa4f
> > --- /dev/null
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/subdev_driver.c
> > @@ -0,0 +1,93 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +// Copyright (c) 2018-19 Mellanox Technologies
> > +
> > +#include <linux/module.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/subdev_bus.h>
> > +#include <linux/subdev_ids.h>
> > +#include <linux/etherdevice.h>
> > +
> > +struct mlx5_subdev_ndev {
> > + struct net_device ndev;
> > +};
> > +
> > +static void mlx5_dma_test(struct device *dev) {
> > + dma_addr_t pa;
> > + void *va;
> > +
> > + va = dma_alloc_coherent(dev, 4096, &pa, GFP_KERNEL);
> > + if (va)
> > + dma_free_coherent(dev, 4096, va, pa); }
> > +
> > +static struct net_device *ndev;
> > +
> > +static int mlx5e_subdev_open(struct net_device *netdev) {
> > + return 0;
> > +}
> > +
> > +static int mlx5e_subdev_close(struct net_device *netdev) {
> > + return 0;
> > +}
> > +
> > +static netdev_tx_t
> > +mlx5e_subdev_xmit(struct sk_buff *skb, struct net_device *netdev) {
> > + return NETDEV_TX_BUSY;
> > +}
> > +
> > +const struct net_device_ops mlx5e_subdev_netdev_ops = {
> > + .ndo_open = mlx5e_subdev_open,
> > + .ndo_stop = mlx5e_subdev_close,
> > + .ndo_start_xmit = mlx5e_subdev_xmit,
> > +};
> > +
> > +static int mlx5_subdev_probe(struct device *dev) {
> > + int err;
> > +
> > + mlx5_dma_test(dev);
>
> Hi Parav, can you please shed some light on how do you plan to
> communicate with the parent device ? (pci_dev and its running driver
> instance), We will need to share some resources, such as IRQs/BARs/etc ..,
> and maybe some HW objects which are going to be managed by the parent
> pci device driver.
>
Since mlx5 driver works on its pci device, in mlx5_subdev_probe(struct device *device)
device->parent is a PCI device for driver to use.
> Just allocating a dma buffer doesn't mean anything, the dma buffer is just
> bound to the generic device.
>
dma buffer allocation is just to make sure that stack and core and rdma ULPs dma allocations in same way as PCI device.
> > + /* Only one device supported in rfc */
> > + if (ndev)
> > + return 0;
> > +
> > + ndev = alloc_etherdev_mqs(sizeof(struct mlx5_subdev_ndev), 1,
> > 1);
> > + if (!ndev)
> > + return -ENOMEM;
> > +
> > + SET_NETDEV_DEV(ndev, dev);
> > + ndev->netdev_ops = &mlx5e_subdev_netdev_ops;
> > + err = register_netdev(ndev);
> > + if (err) {
> > + free_netdev(ndev);
> > + ndev = NULL;
> > + }
> > + return err;
> > +}
> > +
> > +static int mlx5_subdev_remove(struct device *dev) {
> > + if (ndev) {
> > + unregister_netdev(ndev);
> > + free_netdev(ndev);
> > + ndev = NULL;
> > + }
> > + return 0;
> > +}
> > +
> > +static const struct subdev_id mlx5_subdev_id_table[] = {
> > + { .vendor_id = SUBDEV_VENDOR_ID_MELLANOX,
> > + .device_id = SUBDEV_DEVICE_ID_MELLANOX_SF },
> > + { 0, }
> > +};
> > +MODULE_DEVICE_TABLE(subdev, mlx5_subdev_id_table);
> > +
> > +struct subdev_driver mlx5_subdev_driver = {
> > + .id_table = mlx5_subdev_id_table,
> > + .driver.name = "mlx5_subdev_driver",
> > + .driver.probe = mlx5_subdev_probe,
> > + .driver.remove = mlx5_subdev_remove, };
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