The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a9d2e9ae953f0ddd0327479c81a085adaa76d903 Mon Sep 17 00:00:00 2001

From: Jason Gunthorpe jgg@nvidia.com Date: Fri, 6 Nov 2020 10:00:49 -0400 Subject: [PATCH] RDMA/siw,rxe: Make emulated devices virtual in the device tree

This moves siw and rxe to be virtual devices in the device tree:

lrwxrwxrwx 1 root root 0 Nov 6 13:55 /sys/class/infiniband/rxe0 -> ../../devices/virtual/infiniband/rxe0/

Previously they were trying to parent themselves to the physical device of their attached netdev, which doesn't make alot of sense.

My hope is this will solve some weird syzkaller hits related to sysfs as it could be possible that the parent of a netdev is another netdev, eg under bonding or some other syzkaller found netdev configuration.

Nesting a ib_device under anything but a physical device is going to cause inconsistencies in sysfs during destructions.

Link: https://lore.kernel.org/r/0-v1-dcbfc68c4b4a+d6-virtual_dev_jgg@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com

diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c index ee3cf3af7cab..c4b06ced30a7 100644 --- a/drivers/infiniband/sw/rxe/rxe_net.c +++ b/drivers/infiniband/sw/rxe/rxe_net.c @@ -19,15 +19,6 @@

static struct rxe_recv_sockets recv_sockets;

-struct device *rxe_dma_device(struct rxe_dev *rxe) -{ - struct net_device *ndev; - - ndev = rxe->ndev; - - return ndev->dev.parent; -} - int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid) { int err; diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c index a2bd91aaa5de..2fbea2b2d72a 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.c +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -1134,7 +1134,6 @@ int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name) dev->node_type = RDMA_NODE_IB_CA; dev->phys_port_cnt = 1; dev->num_comp_vectors = num_possible_cpus(); - dev->dev.parent = rxe_dma_device(rxe); dev->local_dma_lkey = 0; addrconf_addr_eui48((unsigned char *)&dev->node_guid, rxe->ndev->dev_addr); diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c index d9de062852c4..ee95cf29179d 100644 --- a/drivers/infiniband/sw/siw/siw_main.c +++ b/drivers/infiniband/sw/siw/siw_main.c @@ -305,24 +305,8 @@ static struct siw_device *siw_device_create(struct net_device *netdev) { struct siw_device *sdev = NULL; struct ib_device *base_dev; - struct device *parent = netdev->dev.parent; int rv;

- if (!parent) { - /* - * The loopback device has no parent device, - * so it appears as a top-level device. To support - * loopback device connectivity, take this device - * as the parent device. Skip all other devices - * w/o parent device. - */ - if (netdev->type != ARPHRD_LOOPBACK) { - pr_warn("siw: device %s error: no parent device\n", - netdev->name); - return NULL; - } - parent = &netdev->dev; - } sdev = ib_alloc_device(siw_device, base_dev); if (!sdev) return NULL; @@ -359,7 +343,6 @@ static struct siw_device *siw_device_create(struct net_device *netdev) * per physical port. */ base_dev->phys_port_cnt = 1; - base_dev->dev.parent = parent; base_dev->num_comp_vectors = num_possible_cpus();

xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1); @@ -401,7 +384,7 @@ static struct siw_device *siw_device_create(struct net_device *netdev) atomic_set(&sdev->num_mr, 0); atomic_set(&sdev->num_pd, 0);

- sdev->numa_node = dev_to_node(parent); + sdev->numa_node = dev_to_node(&netdev->dev); spin_lock_init(&sdev->lock);

return sdev;