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401910db4c
This commit is an optimization over commit 01883eda72
("rds: support for zcopy completion notification") for PF_RDS sockets.
RDS applications are predominantly request-response transactions, so
it is more efficient to reduce the number of system calls and have
zerocopy completion notification delivered as ancillary data on the
POLLIN channel.
Cookies are passed up as ancillary data (at level SOL_RDS) in a
struct rds_zcopy_cookies when the returned value of recvmsg() is
greater than, or equal to, 0. A max of RDS_MAX_ZCOOKIES may be passed
with each message.
This commit removes support for zerocopy completion notification on
MSG_ERRQUEUE for PF_RDS sockets.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_ERRQUEUE_H
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#define _UAPI_LINUX_ERRQUEUE_H
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#include <linux/types.h>
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struct sock_extended_err {
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__u32 ee_errno;
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__u8 ee_origin;
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__u8 ee_type;
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__u8 ee_code;
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__u8 ee_pad;
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__u32 ee_info;
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__u32 ee_data;
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};
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#define SO_EE_ORIGIN_NONE 0
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#define SO_EE_ORIGIN_LOCAL 1
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#define SO_EE_ORIGIN_ICMP 2
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#define SO_EE_ORIGIN_ICMP6 3
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#define SO_EE_ORIGIN_TXSTATUS 4
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#define SO_EE_ORIGIN_ZEROCOPY 5
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#define SO_EE_ORIGIN_TIMESTAMPING SO_EE_ORIGIN_TXSTATUS
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#define SO_EE_OFFENDER(ee) ((struct sockaddr*)((ee)+1))
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#define SO_EE_CODE_ZEROCOPY_COPIED 1
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/**
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* struct scm_timestamping - timestamps exposed through cmsg
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*
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* The timestamping interfaces SO_TIMESTAMPING, MSG_TSTAMP_*
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* communicate network timestamps by passing this struct in a cmsg with
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* recvmsg(). See Documentation/networking/timestamping.txt for details.
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*/
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struct scm_timestamping {
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struct timespec ts[3];
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};
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/* The type of scm_timestamping, passed in sock_extended_err ee_info.
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* This defines the type of ts[0]. For SCM_TSTAMP_SND only, if ts[0]
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* is zero, then this is a hardware timestamp and recorded in ts[2].
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*/
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enum {
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SCM_TSTAMP_SND, /* driver passed skb to NIC, or HW */
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SCM_TSTAMP_SCHED, /* data entered the packet scheduler */
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SCM_TSTAMP_ACK, /* data acknowledged by peer */
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};
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#endif /* _UAPI_LINUX_ERRQUEUE_H */
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