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bpf: devmap introduce dev_map_enqueue

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Functionality is the same, but the ndo_xdp_xmit call is now
simply invoked from inside the devmap.c code.

V2: Fix compile issue reported by kbuild test robot <lkp@intel.com>

V5: Cleanups requested by Daniel
 - Newlines before func definition
 - Use BUILD_BUG_ON checks
 - Remove unnecessary use return value store in dev_map_enqueue

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jesper Dangaard Brouer
2018-05-24 16:45:46 +02:00
committed by Alexei Starovoitov
parent f80acbd233
commit 67f29e07e1
4 changed files with 51 additions and 23 deletions
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34
kernel/bpf/devmap.c
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@@ -48,13 +48,15 @@
* calls will fail at this point.
*/
#include <linux/bpf.h>
#include <net/xdp.h>
#include <linux/filter.h>
#include <trace/events/xdp.h>
#define DEV_CREATE_FLAG_MASK \
(BPF_F_NUMA_NODE | BPF_F_RDONLY | BPF_F_WRONLY)
struct bpf_dtab_netdev {
struct net_device *dev;
struct net_device *dev; /* must be first member, due to tracepoint */
struct bpf_dtab *dtab;
unsigned int bit;
struct rcu_head rcu;
@@ -240,21 +242,38 @@ void __dev_map_flush(struct bpf_map *map)
* update happens in parallel here a dev_put wont happen until after reading the
* ifindex.
*/
struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key)
struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key)
{
struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map);
struct bpf_dtab_netdev *dev;
struct bpf_dtab_netdev *obj;
if (key >= map->max_entries)
return NULL;
dev = READ_ONCE(dtab->netdev_map[key]);
return dev ? dev->dev : NULL;
obj = READ_ONCE(dtab->netdev_map[key]);
return obj;
}
int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp)
{
struct net_device *dev = dst->dev;
struct xdp_frame *xdpf;
if (!dev->netdev_ops->ndo_xdp_xmit)
return -EOPNOTSUPP;
xdpf = convert_to_xdp_frame(xdp);
if (unlikely(!xdpf))
return -EOVERFLOW;
/* TODO: implement a bulking/enqueue step later */
return dev->netdev_ops->ndo_xdp_xmit(dev, xdpf);
}
static void *dev_map_lookup_elem(struct bpf_map *map, void *key)
{
struct net_device *dev = __dev_map_lookup_elem(map, *(u32 *)key);
struct bpf_dtab_netdev *obj = __dev_map_lookup_elem(map, *(u32 *)key);
struct net_device *dev = dev = obj ? obj->dev : NULL;
return dev ? &dev->ifindex : NULL;
}
@@ -405,6 +424,9 @@ static struct notifier_block dev_map_notifier = {
static int __init dev_map_init(void)
{
/* Assure tracepoint shadow struct _bpf_dtab_netdev is in sync */
BUILD_BUG_ON(offsetof(struct bpf_dtab_netdev, dev) !=
offsetof(struct _bpf_dtab_netdev, dev));
register_netdevice_notifier(&dev_map_notifier);
return 0;
}