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RDMA/cma: Use rdma_read_gid_attr_ndev_rcu to access netdev 

To access the netdevice of the GID attribute, use an existing API
rdma_read_gid_attr_ndev_rcu().

This further reduces dependency on open access to netdevice of GID
attribute.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Parav Pandit 2019-05-02 10:48:04 +03:00 committed by Jason Gunthorpe
parent a70c07397f
commit adb4a57a7a
4 changed files with 13 additions and 2 deletions
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1
drivers/infiniband/core/addr.c
View File

@ -45,6 +45,7 @@
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_sa.h>
#include <rdma/ib.h>
#include <rdma/rdma_netlink.h>

1
drivers/infiniband/core/cache.c
View File

@ -1249,6 +1249,7 @@ struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr)
read_unlock_irqrestore(&table->rwlock, flags);
return ndev;
}
EXPORT_SYMBOL(rdma_read_gid_attr_ndev_rcu);
static int get_lower_dev_vlan(struct net_device *lower_dev, void *data)
{

12
drivers/infiniband/core/cma.c
View File

@ -1486,6 +1486,7 @@ static struct net_device *
roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
{
const struct ib_gid_attr *sgid_attr = NULL;
struct net_device *ndev;
if (ib_event->event == IB_CM_REQ_RECEIVED)
sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
@ -1494,8 +1495,15 @@ roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
if (!sgid_attr)
return NULL;
dev_hold(sgid_attr->ndev);
return sgid_attr->ndev;
rcu_read_lock();
ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
if (IS_ERR(ndev))
ndev = NULL;
else
dev_hold(ndev);
rcu_read_unlock();
return ndev;
}
static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,

1
include/rdma/ib_cache.h
View File

@ -56,6 +56,7 @@ const struct ib_gid_attr *rdma_find_gid_by_filter(
int rdma_read_gid_l2_fields(const struct ib_gid_attr *attr,
u16 *vlan_id, u8 *smac);
struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr);
/**
* ib_get_cached_pkey - Returns a cached PKey table entry