From: Chuck Lever <chuck.lever@oracle.com>
Date: Fri, 4 Oct 2019 09:58:20 -0400
Subject: svcrdma: Improve DMA mapping trace points
Patch-mainline: v5.5-rc1
Git-commit: 832b2cb955437dcfe9b8f08e5f37303c9097fc87
References: bsc#1154353
Capture the total size of Sends, the size of DMA map and the
matching DMA unmap to ensure operation is correct.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
include/trace/events/rpcrdma.h | 30 +++++++++++++++++++++++-------
net/sunrpc/xprtrdma/svc_rdma_sendto.c | 8 ++++++--
2 files changed, 29 insertions(+), 9 deletions(-)
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -1564,31 +1564,47 @@ DEFINE_ERROR_EVENT(chunk);
** Server-side RDMA API events
**/
-TRACE_EVENT(svcrdma_dma_map_page,
+DECLARE_EVENT_CLASS(svcrdma_dma_map_class,
TP_PROTO(
const struct svcxprt_rdma *rdma,
- const void *page
+ u64 dma_addr,
+ u32 length
),
- TP_ARGS(rdma, page),
+ TP_ARGS(rdma, dma_addr, length),
TP_STRUCT__entry(
- __field(const void *, page);
+ __field(u64, dma_addr)
+ __field(u32, length)
__string(device, rdma->sc_cm_id->device->name)
__string(addr, rdma->sc_xprt.xpt_remotebuf)
),
TP_fast_assign(
- __entry->page = page;
+ __entry->dma_addr = dma_addr;
+ __entry->length = length;
__assign_str(device, rdma->sc_cm_id->device->name);
__assign_str(addr, rdma->sc_xprt.xpt_remotebuf);
),
- TP_printk("addr=%s device=%s page=%p",
- __get_str(addr), __get_str(device), __entry->page
+ TP_printk("addr=%s device=%s dma_addr=%llu length=%u",
+ __get_str(addr), __get_str(device),
+ __entry->dma_addr, __entry->length
)
);
+#define DEFINE_SVC_DMA_EVENT(name) \
+ DEFINE_EVENT(svcrdma_dma_map_class, svcrdma_##name, \
+ TP_PROTO( \
+ const struct svcxprt_rdma *rdma,\
+ u64 dma_addr, \
+ u32 length \
+ ), \
+ TP_ARGS(rdma, dma_addr, length))
+
+DEFINE_SVC_DMA_EVENT(dma_map_page);
+DEFINE_SVC_DMA_EVENT(dma_unmap_page);
+
TRACE_EVENT(svcrdma_dma_map_rwctx,
TP_PROTO(
const struct svcxprt_rdma *rdma,
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -233,11 +233,15 @@ void svc_rdma_send_ctxt_put(struct svcxp
/* The first SGE contains the transport header, which
* remains mapped until @ctxt is destroyed.
*/
- for (i = 1; i < ctxt->sc_send_wr.num_sge; i++)
+ for (i = 1; i < ctxt->sc_send_wr.num_sge; i++) {
ib_dma_unmap_page(device,
ctxt->sc_sges[i].addr,
ctxt->sc_sges[i].length,
DMA_TO_DEVICE);
+ trace_svcrdma_dma_unmap_page(rdma,
+ ctxt->sc_sges[i].addr,
+ ctxt->sc_sges[i].length);
+ }
for (i = 0; i < ctxt->sc_page_count; ++i)
put_page(ctxt->sc_pages[i]);
@@ -490,6 +494,7 @@ static int svc_rdma_dma_map_page(struct
dma_addr_t dma_addr;
dma_addr = ib_dma_map_page(dev, page, offset, len, DMA_TO_DEVICE);
+ trace_svcrdma_dma_map_page(rdma, dma_addr, len);
if (ib_dma_mapping_error(dev, dma_addr))
goto out_maperr;
@@ -499,7 +504,6 @@ static int svc_rdma_dma_map_page(struct
return 0;
out_maperr:
- trace_svcrdma_dma_map_page(rdma, page);
return -EIO;
}