xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

RDS: add receive message trace used by application

Browse Source 
Socket option to tap receive path latency in various stages
in nano seconds. It can be enabled on selective sockets using
using SO_RDS_MSG_RXPATH_LATENCY socket option. RDS will return
the data to application with RDS_CMSG_RXPATH_LATENCY in defined
format. Scope is left to add more trace points for future
without need of change in the interface.

Reviewed-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
This commit is contained in:
Santosh Shilimkar
2016-07-04 22:35:15 -07:00
parent f9fb69adb6
commit 3289025aed
6 changed files with 109 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
include/uapi/linux/rds.h
View File

@@ -52,6 +52,13 @@
#define RDS_GET_MR_FOR_DEST 7
#define SO_RDS_TRANSPORT 8
/* Socket option to tap receive path latency
* SO_RDS: SO_RDS_MSG_RXPATH_LATENCY
* Format used struct rds_rx_trace_so
*/
#define SO_RDS_MSG_RXPATH_LATENCY 10
/* supported values for SO_RDS_TRANSPORT */
#define RDS_TRANS_IB 0
#define RDS_TRANS_IWARP 1
@@ -77,6 +84,12 @@
* the same as for the GET_MR setsockopt.
* RDS_CMSG_RDMA_STATUS (recvmsg)
* Returns the status of a completed RDMA operation.
* RDS_CMSG_RXPATH_LATENCY(recvmsg)
* Returns rds message latencies in various stages of receive
* path in nS. Its set per socket using SO_RDS_MSG_RXPATH_LATENCY
* socket option. Legitimate points are defined in
* enum rds_message_rxpath_latency. More points can be added in
* future. CSMG format is struct rds_cmsg_rx_trace.
*/
#define RDS_CMSG_RDMA_ARGS 1
#define RDS_CMSG_RDMA_DEST 2
@@ -87,6 +100,7 @@
#define RDS_CMSG_ATOMIC_CSWP 7
#define RDS_CMSG_MASKED_ATOMIC_FADD 8
#define RDS_CMSG_MASKED_ATOMIC_CSWP 9
#define RDS_CMSG_RXPATH_LATENCY 11
#define RDS_INFO_FIRST 10000
#define RDS_INFO_COUNTERS 10000
@@ -171,6 +185,25 @@ struct rds_info_rdma_connection {
uint32_t rdma_mr_size;
};
/* RDS message Receive Path Latency points */
enum rds_message_rxpath_latency {
RDS_MSG_RX_HDR_TO_DGRAM_START = 0,
RDS_MSG_RX_DGRAM_REASSEMBLE,
RDS_MSG_RX_DGRAM_DELIVERED,
RDS_MSG_RX_DGRAM_TRACE_MAX
};
struct rds_rx_trace_so {
u8 rx_traces;
u8 rx_trace_pos[RDS_MSG_RX_DGRAM_TRACE_MAX];
};
struct rds_cmsg_rx_trace {
u8 rx_traces;
u8 rx_trace_pos[RDS_MSG_RX_DGRAM_TRACE_MAX];
u64 rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
};
/*
* Congestion monitoring.
* Congestion control in RDS happens at the host connection