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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/net/packet/internal.h
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@@ -39,7 +39,7 @@
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 	char		*nxt_offset;
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 	struct sk_buff	*skb;
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-	atomic_t	blk_fill_in_prog;
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+	rwlock_t	blk_fill_in_prog_lock;
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 	/* Default is set to 8ms */
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 #define DEFAULT_PRB_RETIRE_TOV	(8)
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@@ -77,11 +77,12 @@
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 };
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 extern struct mutex fanout_mutex;
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-#define PACKET_FANOUT_MAX	256
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+#define PACKET_FANOUT_MAX	(1 << 16)
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 struct packet_fanout {
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 	possible_net_t		net;
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 	unsigned int		num_members;
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+	u32			max_num_members;
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 	u16			id;
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 	u8			type;
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 	u8			flags;
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@@ -90,10 +91,10 @@
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 		struct bpf_prog __rcu	*bpf_prog;
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 	};
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 	struct list_head	list;
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-	struct sock		*arr[PACKET_FANOUT_MAX];
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 	spinlock_t		lock;
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 	refcount_t		sk_ref;
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 	struct packet_type	prot_hook ____cacheline_aligned_in_smp;
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+	struct sock	__rcu	*arr[];
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 };
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 struct packet_rollover {
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@@ -135,6 +136,7 @@
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 	struct net_device __rcu	*cached_dev;
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 	int			(*xmit)(struct sk_buff *skb);
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 	struct packet_type	prot_hook ____cacheline_aligned_in_smp;
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+	atomic_t		tp_drops ____cacheline_aligned_in_smp;
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 };
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 static struct packet_sock *pkt_sk(struct sock *sk)