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net: add option to enable error queue packets waking select

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Currently, when a socket receives something on the error queue it only wakes up
the socket on select if it is in the "read" list, that is the socket has
something to read. It is useful also to wake the socket if it is in the error
list, which would enable software to wait on error queue packets without waking
up for regular data on the socket. The main use case is for receiving
timestamped transmit packets which return the timestamp to the socket via the
error queue. This enables an application to select on the socket for the error
queue only instead of for the regular traffic.

-v2-
* Added the SO_SELECT_ERR_QUEUE socket option to every architechture specific file
* Modified every socket poll function that checks error queue

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: Jeffrey Kirsher <jeffrey.t.kirsher@intel.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Matthew Vick <matthew.vick@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Keller, Jacob E 2013-03-28 11:19:25 +00:00 • committed by David S. Miller
parent 4eb0614825
commit 7d4c04fc17
23 changed files with 53 additions and 6 deletions
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2
arch/m32r/include/uapi/asm/socket.h
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@ -72,4 +72,6 @@
#define SO_LOCK_FILTER 44
#define SO_SELECT_ERR_QUEUE 45
#endif /* _ASM_M32R_SOCKET_H */