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svcrdma: Create a generic tracing class for displaying xdr_buf layout

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This class can be used to create trace points in either the RPC
client or RPC server paths. It simply displays the length of each
part of an xdr_buf, which is useful to determine that the transport
and XDR codecs are operating correctly.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2020-03-02 15:01:08 -05:00
parent 28155524ea
commit b20dfc3fcd
4 changed files with 48 additions and 2 deletions
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43
include/trace/events/sunrpc.h
View File

@@ -14,6 +14,49 @@
#include <linux/net.h>
#include <linux/tracepoint.h>
DECLARE_EVENT_CLASS(xdr_buf_class,
TP_PROTO(
const struct xdr_buf *xdr
),
TP_ARGS(xdr),
TP_STRUCT__entry(
__field(const void *, head_base)
__field(size_t, head_len)
__field(const void *, tail_base)
__field(size_t, tail_len)
__field(unsigned int, page_len)
__field(unsigned int, msg_len)
),
TP_fast_assign(
__entry->head_base = xdr->head[0].iov_base;
__entry->head_len = xdr->head[0].iov_len;
__entry->tail_base = xdr->tail[0].iov_base;
__entry->tail_len = xdr->tail[0].iov_len;
__entry->page_len = xdr->page_len;
__entry->msg_len = xdr->len;
),
TP_printk("head=[%p,%zu] page=%u tail=[%p,%zu] len=%u",
__entry->head_base, __entry->head_len, __entry->page_len,
__entry->tail_base, __entry->tail_len, __entry->msg_len
)
);
#define DEFINE_XDRBUF_EVENT(name) \
DEFINE_EVENT(xdr_buf_class, name, \
TP_PROTO( \
const struct xdr_buf *xdr \
), \
TP_ARGS(xdr))
DEFINE_XDRBUF_EVENT(xprt_sendto);
DEFINE_XDRBUF_EVENT(xprt_recvfrom);
DEFINE_XDRBUF_EVENT(svc_recvfrom);
DEFINE_XDRBUF_EVENT(svc_sendto);
TRACE_DEFINE_ENUM(RPC_AUTH_OK);
TRACE_DEFINE_ENUM(RPC_AUTH_BADCRED);
TRACE_DEFINE_ENUM(RPC_AUTH_REJECTEDCRED);