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Message-ID: <20240701115532.GC13195@unreal>
Date: Mon, 1 Jul 2024 14:55:32 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>
Cc: Jason Gunthorpe <jgg@...dia.com>, Mark Zhang <markzhang@...dia.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, linux-rdma@...r.kernel.org,
netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
Saeed Mahameed <saeedm@...dia.com>,
Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH rdma-next 04/12] RDMA/core: Support IB sub device with
type "SMI"
On Sat, Jun 29, 2024 at 08:14:56AM +0800, Zhu Yanjun wrote:
> 在 2024/6/17 0:08, Leon Romanovsky 写道:
> > From: Mark Zhang <markzhang@...dia.com>
> >
> > This patch adds 2 APIs, as well as driver operations to support adding
> > and deleting an IB sub device, which provides part of functionalities
> > of it's parent.
> >
> > A sub device has a type; for a sub device with type "SMI", it provides
> > the smi capability through umad for its parent, meaning uverb is not
> > supported.
> >
> > A sub device cannot live without a parent. So when a parent is
> > released, all it's sub devices are released as well.
> >
> > Signed-off-by: Mark Zhang <markzhang@...dia.com>
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> > drivers/infiniband/core/device.c | 68 +++++++++++++++++++++++++++
> > drivers/infiniband/core/uverbs_main.c | 3 +-
> > include/rdma/ib_verbs.h | 43 +++++++++++++++++
> > include/uapi/rdma/rdma_netlink.h | 5 ++
> > 4 files changed, 118 insertions(+), 1 deletion(-)
<...>
> > +int ib_del_sub_device_and_put(struct ib_device *sub)
> > +{
> > + struct ib_device *parent = sub->parent;
> > +
> > + if (!parent)
> > + return -EOPNOTSUPP;
> > +
> > + mutex_lock(&parent->subdev_lock);
>
> mutex_destroy of subdev_lock is missing. When mutex_lock is called, it had
> better call mutex_destroy when the mutex lock is not used any more.
> Other mutex locks in this file, for example subdev_lock and subdev_lock,
> call mutex_destroy in the function ib_device_release.
>
> Perhaps subdev_lock can also call mutex_destroy in ib_device_release?
Thanks, I will add this fixup to the series.
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 7aaf2b4c1844..7b418c717f29 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -503,6 +503,7 @@ static void ib_device_release(struct device *device)
rcu_head);
}
+ mutex_destroy(&dev->subdev_lock);
mutex_destroy(&dev->unregistration_lock);
mutex_destroy(&dev->compat_devs_mutex);
Thanks
>
> Zhu Yanjun
>
> > + list_del(&sub->subdev_list);
> > + mutex_unlock(&parent->subdev_lock);
> > +
> > + ib_device_put(sub);
> > + parent->ops.del_sub_dev(sub);
> > + ib_device_put(parent);
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(ib_del_sub_device_and_put);
> > +
> > #ifdef CONFIG_INFINIBAND_VIRT_DMA
> > int ib_dma_virt_map_sg(struct ib_device *dev, struct scatterlist *sg, int nents)
> > {
> > diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
> > index 495d5a5d0373..bc099287de9a 100644
> > --- a/drivers/infiniband/core/uverbs_main.c
> > +++ b/drivers/infiniband/core/uverbs_main.c
> > @@ -1114,7 +1114,8 @@ static int ib_uverbs_add_one(struct ib_device *device)
> > struct ib_uverbs_device *uverbs_dev;
> > int ret;
> > - if (!device->ops.alloc_ucontext)
> > + if (!device->ops.alloc_ucontext ||
> > + device->type == RDMA_DEVICE_TYPE_SMI)
> > return -EOPNOTSUPP;
> > uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
> > diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> > index 477bf9dd5e71..bebc2d22f466 100644
> > --- a/include/rdma/ib_verbs.h
> > +++ b/include/rdma/ib_verbs.h
> > @@ -2661,6 +2661,18 @@ struct ib_device_ops {
> > */
> > int (*get_numa_node)(struct ib_device *dev);
> > + /**
> > + * add_sub_dev - Add a sub IB device
> > + */
> > + struct ib_device *(*add_sub_dev)(struct ib_device *parent,
> > + enum rdma_nl_dev_type type,
> > + const char *name);
> > +
> > + /**
> > + * del_sub_dev - Delete a sub IB device
> > + */
> > + void (*del_sub_dev)(struct ib_device *sub_dev);
> > +
> > DECLARE_RDMA_OBJ_SIZE(ib_ah);
> > DECLARE_RDMA_OBJ_SIZE(ib_counters);
> > DECLARE_RDMA_OBJ_SIZE(ib_cq);
> > @@ -2771,6 +2783,15 @@ struct ib_device {
> > char iw_ifname[IFNAMSIZ];
> > u32 iw_driver_flags;
> > u32 lag_flags;
> > +
> > + /* A parent device has a list of sub-devices */
> > + struct mutex subdev_lock;
> > + struct list_head subdev_list_head;
> > +
> > + /* A sub device has a type and a parent */
> > + enum rdma_nl_dev_type type;
> > + struct ib_device *parent;
> > + struct list_head subdev_list;
> > };
> > static inline void *rdma_zalloc_obj(struct ib_device *dev, size_t size,
> > @@ -4820,4 +4841,26 @@ static inline u16 rdma_get_udp_sport(u32 fl, u32 lqpn, u32 rqpn)
> > const struct ib_port_immutable*
> > ib_port_immutable_read(struct ib_device *dev, unsigned int port);
> > +
> > +/** ib_add_sub_device - Add a sub IB device on an existing one
> > + *
> > + * @parent: The IB device that needs to add a sub device
> > + * @type: The type of the new sub device
> > + * @name: The name of the new sub device
> > + *
> > + *
> > + * Return 0 on success, an error code otherwise
> > + */
> > +int ib_add_sub_device(struct ib_device *parent,
> > + enum rdma_nl_dev_type type,
> > + const char *name);
> > +
> > +
> > +/** ib_del_sub_device_and_put - Delect an IB sub device while holding a 'get'
> > + *
> > + * @sub: The sub device that is going to be deleted
> > + *
> > + * Return 0 on success, an error code otherwise
> > + */
> > +int ib_del_sub_device_and_put(struct ib_device *sub);
> > #endif /* IB_VERBS_H */
> > diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h
> > index a214fc259f28..d15ee16be722 100644
> > --- a/include/uapi/rdma/rdma_netlink.h
> > +++ b/include/uapi/rdma/rdma_netlink.h
> > @@ -602,4 +602,9 @@ enum rdma_nl_counter_mask {
> > RDMA_COUNTER_MASK_QP_TYPE = 1,
> > RDMA_COUNTER_MASK_PID = 1 << 1,
> > };
> > +
> > +/* Supported rdma device types. */
> > +enum rdma_nl_dev_type {
> > + RDMA_DEVICE_TYPE_SMI = 1,
> > +};
> > #endif /* _UAPI_RDMA_NETLINK_H */
>
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