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| author |   Martin KaFai Lau <kafai@fb.com> | 2017-06-15 17:29:09 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-06-16 11:58:36 -0400 |
| commit | 58038695e62b4473e4d70e1503933579c640cd52 (patch) | |
| tree | 3fe505510deddba8dcd85ba5eb1cca4df7a0a539 /net/core/dev.c | |
| parent | Merge branch 'skb-accessor-cleanups' (diff) | |
| download | linux-dev-58038695e62b4473e4d70e1503933579c640cd52.tar.xz linux-dev-58038695e62b4473e4d70e1503933579c640cd52.zip | |
net: Add IFLA_XDP_PROG_ID
Expose prog_id through IFLA_XDP_PROG_ID. This patch
makes modification to generic_xdp. The later patches will
modify other xdp-supported drivers.
prog_id is added to struct net_dev_xdp.
iproute2 patch will be followed. Here is how the 'ip link'
will look like:
> ip link show eth0
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 xdp(prog_id:1) qdisc fq_codel state UP mode DEFAULT group default qlen 1000
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 8658074ecad6..b8d6dd9e8b5c 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4342,13 +4342,12 @@ static struct static_key generic_xdp_needed __read_mostly; static int generic_xdp_install(struct net_device *dev, struct netdev_xdp *xdp) { + struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); struct bpf_prog *new = xdp->prog; int ret = 0; switch (xdp->command) { - case XDP_SETUP_PROG: { - struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); - + case XDP_SETUP_PROG: rcu_assign_pointer(dev->xdp_prog, new); if (old) bpf_prog_put(old); @@ -4360,10 +4359,10 @@ static int generic_xdp_install(struct net_device *dev, struct netdev_xdp *xdp) dev_disable_lro(dev); } break; - } case XDP_QUERY_PROG: - xdp->prog_attached = !!rcu_access_pointer(dev->xdp_prog); + xdp->prog_attached = !!old; + xdp->prog_id = old ? old->aux->id : 0; break; default: @@ -6937,7 +6936,8 @@ int dev_change_proto_down(struct net_device *dev, bool proto_down) } EXPORT_SYMBOL(dev_change_proto_down); -bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op) +bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op, + u32 *prog_id) { struct netdev_xdp xdp; @@ -6946,6 +6946,9 @@ bool __dev_xdp_attached(struct net_device *dev, xdp_op_t xdp_op) /* Query must always succeed. */ WARN_ON(xdp_op(dev, &xdp) < 0); + if (prog_id) + *prog_id = xdp.prog_id; + return xdp.prog_attached; } @@ -6991,10 +6994,10 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, xdp_chk = generic_xdp_install; if (fd >= 0) { - if (xdp_chk && __dev_xdp_attached(dev, xdp_chk)) + if (xdp_chk && __dev_xdp_attached(dev, xdp_chk, NULL)) return -EEXIST; if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && - __dev_xdp_attached(dev, xdp_op)) + __dev_xdp_attached(dev, xdp_op, NULL)) return -EBUSY; prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP); |