Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2019-01-29

The following pull-request contains BPF updates for your *net-next* tree.

The main changes are:

1) Teach verifier dead code removal, this also allows for optimizing /
   removing conditional branches around dead code and to shrink the
   resulting image. Code store constrained architectures like nfp would
   have hard time doing this at JIT level, from Jakub.

2) Add JMP32 instructions to BPF ISA in order to allow for optimizing
   code generation for 32-bit sub-registers. Evaluation shows that this
   can result in code reduction of ~5-20% compared to 64 bit-only code
   generation. Also add implementation for most JITs, from Jiong.

3) Add support for __int128 types in BTF which is also needed for
   vmlinux's BTF conversion to work, from Yonghong.

4) Add a new command to bpftool in order to dump a list of BPF-related
   parameters from the system or for a specific network device e.g. in
   terms of available prog/map types or helper functions, from Quentin.

5) Add AF_XDP sock_diag interface for querying sockets from user
   space which provides information about the RX/TX/fill/completion
   rings, umem, memory usage etc, from Björn.

6) Add skb context access for skb_shared_info->gso_segs field, from Eric.

7) Add support for testing flow dissector BPF programs by extending
   existing BPF_PROG_TEST_RUN infrastructure, from Stanislav.

8) Split BPF kselftest's test_verifier into various subgroups of tests
   in order better deal with merge conflicts in this area, from Jakub.

9) Add support for queue/stack manipulations in bpftool, from Stanislav.

10) Document BTF, from Yonghong.

11) Dump supported ELF section names in libbpf on program load
    failure, from Taeung.

12) Silence a false positive compiler warning in verifier's BTF
    handling, from Peter.

13) Fix help string in bpftool's feature probing, from Prashant.

14) Remove duplicate includes in BPF kselftests, from Yue.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 5 deletions

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index a03268454a27..949d3bbccb2f 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -27,14 +27,10 @@
 
 #include "xsk_queue.h"
 #include "xdp_umem.h"
+#include "xsk.h"
 
 #define TX_BATCH_SIZE 16
 
-static struct xdp_sock *xdp_sk(struct sock *sk)
-{
-	return (struct xdp_sock *)sk;
-}
-
 bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
 {
 	return READ_ONCE(xs->rx) &&  READ_ONCE(xs->umem) &&
@@ -350,6 +346,10 @@ static int xsk_release(struct socket *sock)
 
 	net = sock_net(sk);
 
+	mutex_lock(&net->xdp.lock);
+	sk_del_node_init_rcu(sk);
+	mutex_unlock(&net->xdp.lock);
+
 	local_bh_disable();
 	sock_prot_inuse_add(net, sk->sk_prot, -1);
 	local_bh_enable();
@@ -746,6 +746,10 @@ static int xsk_create(struct net *net, struct socket *sock, int protocol,
 	mutex_init(&xs->mutex);
 	spin_lock_init(&xs->tx_completion_lock);
 
+	mutex_lock(&net->xdp.lock);
+	sk_add_node_rcu(sk, &net->xdp.list);
+	mutex_unlock(&net->xdp.lock);
+
 	local_bh_disable();
 	sock_prot_inuse_add(net, &xsk_proto, 1);
 	local_bh_enable();
@@ -759,6 +763,23 @@ static const struct net_proto_family xsk_family_ops = {
 	.owner	= THIS_MODULE,
 };
 
+static int __net_init xsk_net_init(struct net *net)
+{
+	mutex_init(&net->xdp.lock);
+	INIT_HLIST_HEAD(&net->xdp.list);
+	return 0;
+}
+
+static void __net_exit xsk_net_exit(struct net *net)
+{
+	WARN_ON_ONCE(!hlist_empty(&net->xdp.list));
+}
+
+static struct pernet_operations xsk_net_ops = {
+	.init = xsk_net_init,
+	.exit = xsk_net_exit,
+};
+
 static int __init xsk_init(void)
 {
 	int err;
@@ -771,8 +792,13 @@ static int __init xsk_init(void)
 	if (err)
 		goto out_proto;
 
+	err = register_pernet_subsys(&xsk_net_ops);
+	if (err)
+		goto out_sk;
 	return 0;
 
+out_sk:
+	sock_unregister(PF_XDP);
 out_proto:
 	proto_unregister(&xsk_proto);
 out: