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net/packet: make packet_fanout.arr size configurable up to 64K

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[ Upstream commit 9c661b0b85444e426d3f23250305eeb16f6ffe88 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tanner Love
2020-11-06 13:07:40 -05:00
committed by Greg Kroah-Hartman
parent d10c5162b4
commit 3a1c395703
3 changed files with 40 additions and 14 deletions
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12
include/uapi/linux/if_packet.h
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@@ -2,6 +2,7 @@
#ifndef __LINUX_IF_PACKET_H
#define __LINUX_IF_PACKET_H
#include <asm/byteorder.h>
#include <linux/types.h>
struct sockaddr_pkt {
@@ -296,6 +297,17 @@ struct packet_mreq {
unsigned char mr_address[8];
};
struct fanout_args {
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u16 id;
__u16 type_flags;
#else
__u16 type_flags;
__u16 id;
#endif
__u32 max_num_members;
};
#define PACKET_MR_MULTICAST 0
#define PACKET_MR_PROMISC 1
#define PACKET_MR_ALLMULTI 2