diff options
| author | Tanner Love <tannerlove@google.com> | 2020-11-06 21:07:40 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-10 03:41:40 +0300 |
| commit | 9c661b0b85444e426d3f23250305eeb16f6ffe88 (patch) | |
| tree | ccd38de01ae8ce6c1ca2ff0c2d5b14eb10ae73ad /net/packet/internal.h | |
| parent | a3ce2b109a59ee9670706ae8126dcc04cfe261cd (diff) | |
| download | linux-9c661b0b85444e426d3f23250305eeb16f6ffe88.tar.xz | |
net/packet: make packet_fanout.arr size configurable up to 64K
One use case of PACKET_FANOUT is lockless reception with one socket
per CPU. 256 is a practical limit on increasingly many machines.
Increase PACKET_FANOUT_MAX to 64K. Expand setsockopt PACKET_FANOUT to
take an extra argument max_num_members. Also explicitly define a
fanout_args struct, instead of implicitly casting to an integer. This
documents the API and simplifies the control flow.
If max_num_members is not specified or is set to 0, then 256 is used,
same as before.
Signed-off-by: Tanner Love <tannerlove@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/packet/internal.h')
| -rw-r--r-- | net/packet/internal.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/packet/internal.h b/net/packet/internal.h index fd41ecb7f605..baafc3f3fa25 100644 --- a/net/packet/internal.h +++ b/net/packet/internal.h @@ -77,11 +77,12 @@ struct packet_ring_buffer { }; extern struct mutex fanout_mutex; -#define PACKET_FANOUT_MAX 256 +#define PACKET_FANOUT_MAX (1 << 16) struct packet_fanout { possible_net_t net; unsigned int num_members; + u32 max_num_members; u16 id; u8 type; u8 flags; @@ -90,10 +91,10 @@ struct packet_fanout { struct bpf_prog __rcu *bpf_prog; }; struct list_head list; - struct sock *arr[PACKET_FANOUT_MAX]; spinlock_t lock; refcount_t sk_ref; struct packet_type prot_hook ____cacheline_aligned_in_smp; + struct sock *arr[]; }; struct packet_rollover { |