From 67f29e07e131ffa13ea158c259a513f474c7df27 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Thu, 24 May 2018 16:45:46 +0200 Subject: bpf: devmap introduce dev_map_enqueue 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 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 Signed-off-by: Alexei Starovoitov --- kernel/bpf/devmap.c | 34 ++++++++++++++++++++++++++++------ 1 file changed, 28 insertions(+), 6 deletions(-) (limited to 'kernel/bpf') diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 565f9ece9115..06c400e7e4ff 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -48,13 +48,15 @@ * calls will fail at this point. */ #include +#include #include +#include #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; } -- cgit v1.2.3