svcrdma: Add dma map count and WARN_ON

Add a dma map count in order to verify that all DMA mapping resources
have been freed when the transport is closed.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>

3 files changed, 9 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index d25971b42a74..b4b17f44cb29 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -222,6 +222,7 @@ static void rdma_set_ctxt_sge(struct svcxprt_rdma *xprt,
         ctxt->count = count;
         ctxt->direction = DMA_FROM_DEVICE;
         for (i = 0; i < count; i++) {
+                atomic_inc(&xprt->sc_dma_used);
                 ctxt->sge[i].addr =
                         ib_dma_map_single(xprt->sc_cm_id->device,
                                           vec[i].iov_base, vec[i].iov_len,
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index bdc11a30e937..a19b22b452a3 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -163,6 +163,7 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
                 sge_bytes = min((size_t)bc,
                                 (size_t)(vec->sge[xdr_sge_no].iov_len-sge_off));
                 sge[sge_no].length = sge_bytes;
+                atomic_inc(&xprt->sc_dma_used);
                 sge[sge_no].addr =
                         ib_dma_map_single(xprt->sc_cm_id->device,
                                           (void *)
@@ -385,6 +386,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
         ctxt->count = 1;
 
         /* Prepare the SGE for the RPCRDMA Header */
+        atomic_inc(&rdma->sc_dma_used);
         ctxt->sge[0].addr =
                 ib_dma_map_page(rdma->sc_cm_id->device,
                                 page, 0, PAGE_SIZE, DMA_TO_DEVICE);
@@ -396,6 +398,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
         for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
                 sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
                 byte_count -= sge_bytes;
+                atomic_inc(&rdma->sc_dma_used);
                 ctxt->sge[sge_no].addr =
                         ib_dma_map_single(rdma->sc_cm_id->device,
                                           vec->sge[sge_no].iov_base,
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 7e8ee66458ea..6fddd588c031 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -155,6 +155,7 @@ static void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
         struct svcxprt_rdma *xprt = ctxt->xprt;
         int i;
         for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
+                atomic_dec(&xprt->sc_dma_used);
                 ib_dma_unmap_single(xprt->sc_cm_id->device,
                                     ctxt->sge[i].addr,
                                     ctxt->sge[i].length,
@@ -519,6 +520,7 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
         cma_xprt->sc_max_requests = svcrdma_max_requests;
         cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
         atomic_set(&cma_xprt->sc_sq_count, 0);
+        atomic_set(&cma_xprt->sc_ctxt_used, 0);
 
         if (!listener) {
                 int reqs = cma_xprt->sc_max_requests;
@@ -569,6 +571,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
                 BUG_ON(sge_no >= xprt->sc_max_sge);
                 page = svc_rdma_get_page();
                 ctxt->pages[sge_no] = page;
+                atomic_inc(&xprt->sc_dma_used);
                 pa = ib_dma_map_page(xprt->sc_cm_id->device,
                                      page, 0, PAGE_SIZE,
                                      DMA_FROM_DEVICE);
@@ -1049,6 +1052,7 @@ static void __svc_rdma_free(struct work_struct *work)
 
         /* Warn if we leaked a resource or under-referenced */
         WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0);
+        WARN_ON(atomic_read(&rdma->sc_dma_used) != 0);
 
         /* Destroy the QP if present (not a listener) */
         if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
@@ -1169,6 +1173,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
         length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
 
         /* Prepare SGE for local address */
+        atomic_inc(&xprt->sc_dma_used);
         sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
                                    p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
         sge.lkey = xprt->sc_phys_mr->lkey;