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

Alexei Starovoitov says:

====================
pull-request: bpf-next 2020-09-23

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

We've added 95 non-merge commits during the last 22 day(s) which contain
a total of 124 files changed, 4211 insertions(+), 2040 deletions(-).

The main changes are:

1) Full multi function support in libbpf, from Andrii.

2) Refactoring of function argument checks, from Lorenz.

3) Make bpf_tail_call compatible with functions (subprograms), from Maciej.

4) Program metadata support, from YiFei.

5) bpf iterator optimizations, from Yonghong.
====================

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

5 files changed, 10 insertions, 23 deletions

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 5eb6662f562a..3895697f8540 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -33,12 +33,6 @@
 
 static DEFINE_PER_CPU(struct list_head, xskmap_flush_list);
 
-bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
-{
-	return READ_ONCE(xs->rx) &&  READ_ONCE(xs->umem) &&
-		(xs->pool->fq || READ_ONCE(xs->fq_tmp));
-}
-
 void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
 {
 	if (pool->cached_need_wakeup & XDP_WAKEUP_RX)
@@ -717,6 +711,7 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 						   dev, qid);
 			if (err) {
 				xp_destroy(xs->pool);
+				xs->pool = NULL;
 				sockfd_put(sock);
 				goto out_unlock;
 			}
diff --git a/net/xdp/xsk.h b/net/xdp/xsk.h
index da1f73e43924..b9e896cee5bb 100644
--- a/net/xdp/xsk.h
+++ b/net/xdp/xsk.h
@@ -39,7 +39,6 @@ static inline struct xdp_sock *xdp_sk(struct sock *sk)
 	return (struct xdp_sock *)sk;
 }
 
-bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs);
 void xsk_map_try_sock_delete(struct xsk_map *map, struct xdp_sock *xs,
 			     struct xdp_sock **map_entry);
 int xsk_map_inc(struct xsk_map *map);
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 795d7c81c0ca..e63fadd000db 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -287,7 +287,7 @@ static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_devi
 		return NULL;
 
 	dma_map->dma_pages = kvcalloc(nr_pages, sizeof(*dma_map->dma_pages), GFP_KERNEL);
-	if (!dma_map) {
+	if (!dma_map->dma_pages) {
 		kfree(dma_map);
 		return NULL;
 	}
@@ -296,7 +296,7 @@ static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_devi
 	dma_map->dev = dev;
 	dma_map->dma_need_sync = false;
 	dma_map->dma_pages_cnt = nr_pages;
-	refcount_set(&dma_map->users, 0);
+	refcount_set(&dma_map->users, 1);
 	list_add(&dma_map->list, &umem->xsk_dma_list);
 	return dma_map;
 }
@@ -369,7 +369,6 @@ static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_
 	pool->dev = dma_map->dev;
 	pool->dma_pages_cnt = dma_map->dma_pages_cnt;
 	pool->dma_need_sync = dma_map->dma_need_sync;
-	refcount_inc(&dma_map->users);
 	memcpy(pool->dma_pages, dma_map->dma_pages,
 	       pool->dma_pages_cnt * sizeof(*pool->dma_pages));
 
@@ -390,6 +389,7 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 		if (err)
 			return err;
 
+		refcount_inc(&dma_map->users);
 		return 0;
 	}
 
diff --git a/net/xdp/xsk_diag.c b/net/xdp/xsk_diag.c
index 5bd8ea9d206a..c014217f5fa7 100644
--- a/net/xdp/xsk_diag.c
+++ b/net/xdp/xsk_diag.c
@@ -59,22 +59,20 @@ static int xsk_diag_put_umem(const struct xdp_sock *xs, struct sk_buff *nlskb)
 	du.num_pages = umem->npgs;
 	du.chunk_size = umem->chunk_size;
 	du.headroom = umem->headroom;
-	du.ifindex = pool->netdev ? pool->netdev->ifindex : 0;
-	du.queue_id = pool->queue_id;
+	du.ifindex = (pool && pool->netdev) ? pool->netdev->ifindex : 0;
+	du.queue_id = pool ? pool->queue_id : 0;
 	du.flags = 0;
 	if (umem->zc)
 		du.flags |= XDP_DU_F_ZEROCOPY;
 	du.refs = refcount_read(&umem->users);
 
 	err = nla_put(nlskb, XDP_DIAG_UMEM, sizeof(du), &du);
-
-	if (!err && pool->fq)
+	if (!err && pool && pool->fq)
 		err = xsk_diag_put_ring(pool->fq,
 					XDP_DIAG_UMEM_FILL_RING, nlskb);
-	if (!err && pool->cq) {
-		err = xsk_diag_put_ring(pool->cq, XDP_DIAG_UMEM_COMPLETION_RING,
-					nlskb);
-	}
+	if (!err && pool && pool->cq)
+		err = xsk_diag_put_ring(pool->cq,
+					XDP_DIAG_UMEM_COMPLETION_RING, nlskb);
 	return err;
 }
 
diff --git a/net/xdp/xskmap.c b/net/xdp/xskmap.c
index 2a4fd6677155..0c5df593bc56 100644
--- a/net/xdp/xskmap.c
+++ b/net/xdp/xskmap.c
@@ -185,11 +185,6 @@ static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value,
 
 	xs = (struct xdp_sock *)sock->sk;
 
-	if (!xsk_is_setup_for_bpf_map(xs)) {
-		sockfd_put(sock);
-		return -EOPNOTSUPP;
-	}
-
 	map_entry = &m->xsk_map[i];
 	node = xsk_map_node_alloc(m, map_entry);
 	if (IS_ERR(node)) {