linux_dsm_epyc7002/include/uapi/linux/errqueue.h
Willem de Bruijn 52267790ef sock: add MSG_ZEROCOPY
The kernel supports zerocopy sendmsg in virtio and tap. Expand the
infrastructure to support other socket types. Introduce a completion
notification channel over the socket error queue. Notifications are
returned with ee_origin SO_EE_ORIGIN_ZEROCOPY. ee_errno is 0 to avoid
blocking the send/recv path on receiving notifications.

Add reference counting, to support the skb split, merge, resize and
clone operations possible with SOCK_STREAM and other socket types.

The patch does not yet modify any datapaths.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-03 21:37:29 -07:00

50 lines
1.3 KiB
C

#ifndef _UAPI_LINUX_ERRQUEUE_H
#define _UAPI_LINUX_ERRQUEUE_H
#include <linux/types.h>
struct sock_extended_err {
__u32 ee_errno;
__u8 ee_origin;
__u8 ee_type;
__u8 ee_code;
__u8 ee_pad;
__u32 ee_info;
__u32 ee_data;
};
#define SO_EE_ORIGIN_NONE 0
#define SO_EE_ORIGIN_LOCAL 1
#define SO_EE_ORIGIN_ICMP 2
#define SO_EE_ORIGIN_ICMP6 3
#define SO_EE_ORIGIN_TXSTATUS 4
#define SO_EE_ORIGIN_ZEROCOPY 5
#define SO_EE_ORIGIN_TIMESTAMPING SO_EE_ORIGIN_TXSTATUS
#define SO_EE_OFFENDER(ee) ((struct sockaddr*)((ee)+1))
#define SO_EE_CODE_ZEROCOPY_COPIED 1
/**
* struct scm_timestamping - timestamps exposed through cmsg
*
* The timestamping interfaces SO_TIMESTAMPING, MSG_TSTAMP_*
* communicate network timestamps by passing this struct in a cmsg with
* recvmsg(). See Documentation/networking/timestamping.txt for details.
*/
struct scm_timestamping {
struct timespec ts[3];
};
/* The type of scm_timestamping, passed in sock_extended_err ee_info.
* This defines the type of ts[0]. For SCM_TSTAMP_SND only, if ts[0]
* is zero, then this is a hardware timestamp and recorded in ts[2].
*/
enum {
SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */
SCM_TSTAMP_SCHED, /* data entered the packet scheduler */
SCM_TSTAMP_ACK, /* data acknowledged by peer */
};
#endif /* _UAPI_LINUX_ERRQUEUE_H */