linux-kernel - RE: [PATCH rdma-next v1 4/5] RDMA/mana

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Message-ID:
 <DU0PR83MB0553677CB52F310AA7CB0F2AB4432@DU0PR83MB0553.EURPRD83.prod.outlook.com>
Date: Thu, 1 Feb 2024 10:05:08 +0000
From: Konstantin Taranov <kotaranov@...rosoft.com>
To: Long Li <longli@...rosoft.com>, Konstantin Taranov
	<kotaranov@...ux.microsoft.com>, Ajay Sharma <sharmaajay@...rosoft.com>,
	"jgg@...pe.ca" <jgg@...pe.ca>, "leon@...nel.org" <leon@...nel.org>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH rdma-next v1 4/5] RDMA/mana_ib: Enable RoCE on port 1

> > Subject: [PATCH rdma-next v1 4/5] RDMA/mana_ib: Enable RoCE on port 1
> >
> > Set netdev and RoCEv2 flag to be used in GID population.
> > mana_ib is auxiliary device, thus we need GIDs of the master netdev.
> >
> > Signed-off-by: Konstantin Taranov <kotaranov@...ux.microsoft.com>
> > ---
> >  drivers/infiniband/hw/mana/device.c | 14 ++++++++++++++
> >  drivers/infiniband/hw/mana/main.c   | 16 ++++++++++++----
> >  2 files changed, 26 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/infiniband/hw/mana/device.c
> > b/drivers/infiniband/hw/mana/device.c
> > index 11b0410..b9ff3fd 100644
> > --- a/drivers/infiniband/hw/mana/device.c
> > +++ b/drivers/infiniband/hw/mana/device.c
> > @@ -53,6 +53,7 @@ static int mana_ib_probe(struct auxiliary_device
> *adev,  {
> >  	struct mana_adev *madev = container_of(adev, struct mana_adev,
> > adev);
> >  	struct gdma_dev *mdev = madev->mdev;
> > +	struct net_device *upper_ndev;
> >  	struct mana_context *mc;
> >  	struct mana_ib_dev *dev;
> >  	int ret;
> > @@ -79,6 +80,19 @@ static int mana_ib_probe(struct auxiliary_device
> *adev,
> >  	dev->ib_dev.num_comp_vectors = 1;
> >  	dev->ib_dev.dev.parent = mdev->gdma_context->dev;
> >
> > +	rcu_read_lock(); /* required to get upper dev */
> > +	upper_ndev = netdev_master_upper_dev_get_rcu(mc->ports[0]);
> > +	rcu_read_unlock();
> 
> Should call rcu_read_unlock() after upper_ndev is used and no longer
> needed, or it could be freed after someone calls rcu_synchronize().
> 

Thanks! I will unlock right after the netdev is set. I will address it in the v2.

> > +	if (!upper_ndev) {
> > +		ibdev_err(&dev->ib_dev, "Failed to get master netdev");
> > +		goto free_ib_device;
> > +	}
> > +	ret = ib_device_set_netdev(&dev->ib_dev, upper_ndev, 1);
> > +	if (ret) {
> > +		ibdev_err(&dev->ib_dev, "Failed to set ib netdev, ret %d",
> ret);
> > +		goto free_ib_device;
> > +	}
> > +
> >  	ret = mana_gd_register_device(&mdev->gdma_context->mana_ib);
> >  	if (ret) {
> >  		ibdev_err(&dev->ib_dev, "Failed to register device, ret %d",
> diff -
> > -git a/drivers/infiniband/hw/mana/main.c
> > b/drivers/infiniband/hw/mana/main.c
> > index 3e05a62..645abf3 100644
> > --- a/drivers/infiniband/hw/mana/main.c
> > +++ b/drivers/infiniband/hw/mana/main.c
> > @@ -462,11 +462,19 @@ int mana_ib_mmap(struct ib_ucontext
> *ibcontext,
> > struct vm_area_struct *vma)  int mana_ib_get_port_immutable(struct
> > ib_device *ibdev, u32 port_num,
> >  			       struct ib_port_immutable *immutable)  {
> > -	/*
> > -	 * This version only support RAW_PACKET
> > -	 * other values need to be filled for other types
> > -	 */
> > +	struct mana_ib_dev *mdev = container_of(ibdev, struct
> mana_ib_dev,
> > ib_dev);
> > +	struct ib_port_attr attr;
> > +	int err;
> > +
> > +	err = ib_query_port(ibdev, port_num, &attr);
> > +	if (err)
> > +		return err;
> > +
> > +	immutable->pkey_tbl_len = attr.pkey_tbl_len;
> > +	immutable->gid_tbl_len = attr.gid_tbl_len;
> >  	immutable->core_cap_flags = RDMA_CORE_PORT_RAW_PACKET;
> > +	if (port_num == 1 && rnic_is_enabled(mdev))
> > +		immutable->core_cap_flags |=
> > RDMA_CORE_PORT_IBA_ROCE_UDP_ENCAP;
> >
> >  	return 0;
> >  }
> > --
> > 1.8.3.1