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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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3b885787ea
Create a new socket level option to report number of queue overflows
Recently I augmented the AF_PACKET protocol to report the number of frames lost
on the socket receive queue between any two enqueued frames. This value was
exported via a SOL_PACKET level cmsg. AFter I completed that work it was
requested that this feature be generalized so that any datagram oriented socket
could make use of this option. As such I've created this patch, It creates a
new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a
SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue
overflowed between any two given frames. It also augments the AF_PACKET
protocol to take advantage of this new feature (as it previously did not touch
sk->sk_drops, which this patch uses to record the overflow count). Tested
successfully by me.
Notes:
1) Unlike my previous patch, this patch simply records the sk_drops value, which
is not a number of drops between packets, but rather a total number of drops.
Deltas must be computed in user space.
2) While this patch currently works with datagram oriented protocols, it will
also be accepted by non-datagram oriented protocols. I'm not sure if thats
agreeable to everyone, but my argument in favor of doing so is that, for those
protocols which aren't applicable to this option, sk_drops will always be zero,
and reporting no drops on a receive queue that isn't used for those
non-participating protocols seems reasonable to me. This also saves us having
to code in a per-protocol opt in mechanism.
3) This applies cleanly to net-next assuming that commit
977750076d (my af packet cmsg patch) is reverted
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
#ifndef _ASM_SOCKET_H
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#define _ASM_SOCKET_H
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#include <asm/sockios.h>
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/* For setsockopt(2) */
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#define SOL_SOCKET 0xffff
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#define SO_DEBUG 0x0001
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#define SO_PASSCRED 0x0002
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#define SO_REUSEADDR 0x0004
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#define SO_KEEPALIVE 0x0008
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#define SO_DONTROUTE 0x0010
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#define SO_BROADCAST 0x0020
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#define SO_PEERCRED 0x0040
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#define SO_LINGER 0x0080
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#define SO_OOBINLINE 0x0100
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/* To add :#define SO_REUSEPORT 0x0200 */
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#define SO_BSDCOMPAT 0x0400
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#define SO_RCVLOWAT 0x0800
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#define SO_SNDLOWAT 0x1000
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#define SO_RCVTIMEO 0x2000
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#define SO_SNDTIMEO 0x4000
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#define SO_ACCEPTCONN 0x8000
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#define SO_SNDBUF 0x1001
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#define SO_RCVBUF 0x1002
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#define SO_SNDBUFFORCE 0x100a
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#define SO_RCVBUFFORCE 0x100b
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#define SO_ERROR 0x1007
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#define SO_TYPE 0x1008
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#define SO_PROTOCOL 0x1028
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#define SO_DOMAIN 0x1029
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/* Linux specific, keep the same. */
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#define SO_NO_CHECK 0x000b
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#define SO_PRIORITY 0x000c
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#define SO_BINDTODEVICE 0x000d
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#define SO_ATTACH_FILTER 0x001a
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#define SO_DETACH_FILTER 0x001b
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#define SO_PEERNAME 0x001c
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#define SO_TIMESTAMP 0x001d
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#define SCM_TIMESTAMP SO_TIMESTAMP
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#define SO_PEERSEC 0x001e
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#define SO_PASSSEC 0x001f
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#define SO_TIMESTAMPNS 0x0021
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#define SCM_TIMESTAMPNS SO_TIMESTAMPNS
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#define SO_MARK 0x0022
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#define SO_TIMESTAMPING 0x0023
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#define SCM_TIMESTAMPING SO_TIMESTAMPING
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#define SO_RXQ_OVFL 0x0024
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/* Security levels - as per NRL IPv6 - don't actually do anything */
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#define SO_SECURITY_AUTHENTICATION 0x5001
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#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002
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#define SO_SECURITY_ENCRYPTION_NETWORK 0x5004
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#endif /* _ASM_SOCKET_H */
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