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Date: Wed, 19 Oct 2022 05:37:54 +0000
From: Eli Cohen <elic@...dia.com>
To: Jason Wang <jasowang@...hat.com>,
"mst@...hat.com" <mst@...hat.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>
CC: "si-wei.liu@...cle.com" <si-wei.liu@...cle.com>,
"eperezma@...hat.com" <eperezma@...hat.com>,
"lulu@...hat.com" <lulu@...hat.com>
Subject: RE: [PATCH 3/4] vdpa/mlx5: Add debugfs subtree
> From: Jason Wang <jasowang@...hat.com>
> Sent: Wednesday, 19 October 2022 8:14
> To: Eli Cohen <elic@...dia.com>; mst@...hat.com; linux-
> kernel@...r.kernel.org; virtualization@...ts.linux-foundation.org
> Cc: si-wei.liu@...cle.com; eperezma@...hat.com; lulu@...hat.com
> Subject: Re: [PATCH 3/4] vdpa/mlx5: Add debugfs subtree
>
>
> 在 2022/10/18 19:12, Eli Cohen 写道:
> > Add debugfs subtree and expose flow table ID and TIR number. This
> > information can be used by external tools to do extended
> > troubleshooting.
> >
> > The information can be retrieved like so:
> > $ cat /sys/kernel/debug/mlx5/mlx5_core.sf.1/vdpa-0/rx/table_id
> > $ cat /sys/kernel/debug/mlx5/mlx5_core.sf.1/vdpa-0/rx/tirn
>
>
> I wonder if we need a config option for this.
>
> And if it's better to use vendor stats.
>
I am not sure. TIRs and flow tables has loose association VDPA. I would keep it in
debugfs which for mlx5 there's lots of other information there.
> Thanks
>
>
> >
> > Signed-off-by: Eli Cohen <elic@...dia.com>
> > ---
> > drivers/vdpa/mlx5/Makefile | 2 +-
> > drivers/vdpa/mlx5/net/debug.c | 66
> +++++++++++++++++++++++++++++++
> > drivers/vdpa/mlx5/net/mlx5_vnet.c | 11 ++++++
> > drivers/vdpa/mlx5/net/mlx5_vnet.h | 9 +++++
> > 4 files changed, 87 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/vdpa/mlx5/net/debug.c
> >
> > diff --git a/drivers/vdpa/mlx5/Makefile b/drivers/vdpa/mlx5/Makefile
> > index f717978c83bf..e791394c33e3 100644
> > --- a/drivers/vdpa/mlx5/Makefile
> > +++ b/drivers/vdpa/mlx5/Makefile
> > @@ -1,4 +1,4 @@
> > subdir-ccflags-y += -I$(srctree)/drivers/vdpa/mlx5/core
> >
> > obj-$(CONFIG_MLX5_VDPA_NET) += mlx5_vdpa.o
> > -mlx5_vdpa-$(CONFIG_MLX5_VDPA_NET) += net/mlx5_vnet.o
> core/resources.o core/mr.o
> > +mlx5_vdpa-$(CONFIG_MLX5_VDPA_NET) += net/mlx5_vnet.o
> core/resources.o core/mr.o net/debug.o
> > diff --git a/drivers/vdpa/mlx5/net/debug.c b/drivers/vdpa/mlx5/net/debug.c
> > new file mode 100644
> > index 000000000000..95e4801df211
> > --- /dev/null
> > +++ b/drivers/vdpa/mlx5/net/debug.c
> > @@ -0,0 +1,66 @@
> > +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
> > +/* Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights
> reserved. */
> > +
> > +#include <linux/debugfs.h>
> > +#include <linux/mlx5/fs.h>
> > +#include "mlx5_vnet.h"
> > +
> > +static int tirn_show(struct seq_file *file, void *priv)
> > +{
> > + struct mlx5_vdpa_net *ndev = file->private;
> > +
> > + seq_printf(file, "0x%x\n", ndev->res.tirn);
> > + return 0;
> > +}
> > +
> > +DEFINE_SHOW_ATTRIBUTE(tirn);
> > +
> > +void mlx5_vdpa_remove_tirn(struct mlx5_vdpa_net *ndev)
> > +{
> > + if (ndev->debugfs)
> > + debugfs_remove(ndev->res.tirn_dent);
> > +}
> > +
> > +void mlx5_vdpa_add_tirn(struct mlx5_vdpa_net *ndev)
> > +{
> > + ndev->res.tirn_dent = debugfs_create_file("tirn", 0444, ndev-
> >rx_dent,
> > + ndev, &tirn_fops);
> > +}
> > +
> > +static int rx_flow_table_show(struct seq_file *file, void *priv)
> > +{
> > + struct mlx5_vdpa_net *ndev = file->private;
> > +
> > + seq_printf(file, "0x%x\n", mlx5_flow_table_id(ndev->rxft));
> > + return 0;
> > +}
> > +
> > +DEFINE_SHOW_ATTRIBUTE(rx_flow_table);
> > +
> > +void mlx5_vdpa_remove_rx_flow_table(struct mlx5_vdpa_net *ndev)
> > +{
> > + if (ndev->debugfs)
> > + debugfs_remove(ndev->rx_table_dent);
> > +}
> > +
> > +void mlx5_vdpa_add_rx_flow_table(struct mlx5_vdpa_net *ndev)
> > +{
> > + ndev->rx_table_dent = debugfs_create_file("table_id", 0444, ndev-
> >rx_dent,
> > + ndev, &rx_flow_table_fops);
> > +}
> > +
> > +void mlx5_vdpa_add_debugfs(struct mlx5_vdpa_net *ndev)
> > +{
> > + struct mlx5_core_dev *mdev;
> > +
> > + mdev = ndev->mvdev.mdev;
> > + ndev->debugfs = debugfs_create_dir(dev_name(&ndev-
> >mvdev.vdev.dev),
> > +
> mlx5_debugfs_get_dev_root(mdev));
> > + if (!IS_ERR(ndev->debugfs))
> > + ndev->rx_dent = debugfs_create_dir("rx", ndev->debugfs);
> > +}
> > +
> > +void mlx5_vdpa_remove_debugfs(struct dentry *dbg)
> > +{
> > + debugfs_remove_recursive(dbg);
> > +}
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index 64fdb940380f..ee50da33e25b 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -1388,11 +1388,16 @@ static int create_tir(struct mlx5_vdpa_net
> *ndev)
> >
> > err = mlx5_vdpa_create_tir(&ndev->mvdev, in, &ndev->res.tirn);
> > kfree(in);
> > + if (err)
> > + return err;
> > +
> > + mlx5_vdpa_add_tirn(ndev);
> > return err;
> > }
> >
> > static void destroy_tir(struct mlx5_vdpa_net *ndev)
> > {
> > + mlx5_vdpa_remove_tirn(ndev);
> > mlx5_vdpa_destroy_tir(&ndev->mvdev, ndev->res.tirn);
> > }
> >
> > @@ -1576,6 +1581,7 @@ static int setup_steering(struct mlx5_vdpa_net
> *ndev)
> > mlx5_vdpa_warn(&ndev->mvdev, "failed to create flow
> table\n");
> > return PTR_ERR(ndev->rxft);
> > }
> > + mlx5_vdpa_add_rx_flow_table(ndev);
> >
> > err = mac_vlan_add(ndev, ndev->config.mac, 0, false);
> > if (err)
> > @@ -1584,6 +1590,7 @@ static int setup_steering(struct mlx5_vdpa_net
> *ndev)
> > return 0;
> >
> > err_add:
> > + mlx5_vdpa_remove_rx_flow_table(ndev);
> > mlx5_destroy_flow_table(ndev->rxft);
> > return err;
> > }
> > @@ -1591,6 +1598,7 @@ static int setup_steering(struct mlx5_vdpa_net
> *ndev)
> > static void teardown_steering(struct mlx5_vdpa_net *ndev)
> > {
> > clear_mac_vlan_table(ndev);
> > + mlx5_vdpa_remove_rx_flow_table(ndev);
> > mlx5_destroy_flow_table(ndev->rxft);
> > }
> >
> > @@ -3167,6 +3175,7 @@ static int mlx5_vdpa_dev_add(struct
> vdpa_mgmt_dev *v_mdev, const char *name,
> > if (err)
> > goto err_reg;
> >
> > + mlx5_vdpa_add_debugfs(ndev);
> > mgtdev->ndev = ndev;
> > return 0;
> >
> > @@ -3193,6 +3202,8 @@ static void mlx5_vdpa_dev_del(struct
> vdpa_mgmt_dev *v_mdev, struct vdpa_device *
> > struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
> > struct workqueue_struct *wq;
> >
> > + mlx5_vdpa_remove_debugfs(ndev->debugfs);
> > + ndev->debugfs = NULL;
> > if (ndev->nb_registered) {
> > mlx5_notifier_unregister(mvdev->mdev, &ndev->nb);
> > ndev->nb_registered = false;
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.h
> b/drivers/vdpa/mlx5/net/mlx5_vnet.h
> > index 6691c879a6ca..f2cef3925e5b 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.h
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.h
> > @@ -16,6 +16,7 @@ struct mlx5_vdpa_net_resources {
> > u32 tirn;
> > u32 rqtn;
> > bool valid;
> > + struct dentry *tirn_dent;
> > };
> >
> > #define MLX5V_MACVLAN_SIZE 256
> > @@ -43,6 +44,7 @@ struct mlx5_vdpa_net {
> > struct vdpa_callback config_cb;
> > struct mlx5_vdpa_wq_ent cvq_ent;
> > struct hlist_head macvlan_hash[MLX5V_MACVLAN_SIZE];
> > + struct dentry *debugfs;
> > };
> >
> > struct macvlan_node {
> > @@ -52,4 +54,11 @@ struct macvlan_node {
> > u64 macvlan;
> > };
> >
> > +void mlx5_vdpa_add_debugfs(struct mlx5_vdpa_net *ndev);
> > +void mlx5_vdpa_remove_debugfs(struct dentry *dbg);
> > +void mlx5_vdpa_add_rx_flow_table(struct mlx5_vdpa_net *ndev);
> > +void mlx5_vdpa_remove_rx_flow_table(struct mlx5_vdpa_net *ndev);
> > +void mlx5_vdpa_add_tirn(struct mlx5_vdpa_net *ndev);
> > +void mlx5_vdpa_remove_tirn(struct mlx5_vdpa_net *ndev);
> > +
> > #endif /* __MLX5_VNET_H__ */
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