From 3289025aedc018f8fd9d0e37fb9efa0c6d531ffa Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Mon, 4 Jul 2016 22:35:15 -0700 Subject: RDS: add receive message trace used by application 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 Signed-off-by: Santosh Shilimkar --- include/uapi/linux/rds.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'include') diff --git a/include/uapi/linux/rds.h b/include/uapi/linux/rds.h index 0f9265cb2a96..3833113ab2c0 100644 --- a/include/uapi/linux/rds.h +++ b/include/uapi/linux/rds.h @@ -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 -- cgit v1.2.3