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bpf: offload: allow program and map sharing per-ASIC

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Allow programs and maps to be re-used across different netdevs,
as long as they belong to the same struct bpf_offload_dev.
Update the bpf_offload_prog_map_match() helper for the verifier
and export a new helper for the drivers to use when checking
programs at attachment time.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-07-17 10:53:26 -07:00 committed by Daniel Borkmann
parent 602144c224
commit fd4f227dea
2 changed files with 36 additions and 7 deletions
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1
include/linux/bpf.h
View File

@ -657,6 +657,7 @@ int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
struct net_device *netdev);
void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
struct net_device *netdev);
bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);

42
kernel/bpf/offload.c
View File

@ -511,22 +511,50 @@ int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map)
return 0;
}
bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
static bool __bpf_offload_dev_match(struct bpf_prog *prog,
struct net_device *netdev)
{
struct bpf_offloaded_map *offmap;
struct bpf_offload_netdev *ondev1, *ondev2;
struct bpf_prog_offload *offload;
bool ret;
if (!bpf_prog_is_dev_bound(prog->aux))
return false;
if (!bpf_map_is_dev_bound(map))
return bpf_map_offload_neutral(map);
offload = prog->aux->offload;
if (!offload)
return false;
if (offload->netdev == netdev)
return true;
ondev1 = bpf_offload_find_netdev(offload->netdev);
ondev2 = bpf_offload_find_netdev(netdev);
return ondev1 && ondev2 && ondev1->offdev == ondev2->offdev;
}
bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev)
{
bool ret;
down_read(&bpf_devs_lock);
offload = prog->aux->offload;
ret = __bpf_offload_dev_match(prog, netdev);
up_read(&bpf_devs_lock);
return ret;
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_match);
bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
{
struct bpf_offloaded_map *offmap;
bool ret;
if (!bpf_map_is_dev_bound(map))
return bpf_map_offload_neutral(map);
offmap = map_to_offmap(map);
ret = offload && offload->netdev == offmap->netdev;
down_read(&bpf_devs_lock);
ret = __bpf_offload_dev_match(prog, offmap->netdev);
up_read(&bpf_devs_lock);
return ret;