xprtrdma: Chain together all MWs in same buffer pool

During connection loss recovery, need to visit every MW in a
buffer pool. Any MW that is in use by an RPC will not be on the
rb_mws list.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Shirley Ma <shirley.ma@oracle.com>
Tested-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

2 files changed, 7 insertions, 1 deletions

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index b670f4d92840..0ad7d10f13a7 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1074,6 +1074,7 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
         p += cdata->padding;
 
         INIT_LIST_HEAD(&buf->rb_mws);
+        INIT_LIST_HEAD(&buf->rb_all);
         r = (struct rpcrdma_mw *)p;
         switch (ia->ri_memreg_strategy) {
         case RPCRDMA_FRMR:
@@ -1098,6 +1099,7 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
                                 ib_dereg_mr(r->r.frmr.fr_mr);
                                 goto out;
                         }
+                        list_add(&r->mw_all, &buf->rb_all);
                         list_add(&r->mw_list, &buf->rb_mws);
                         ++r;
                 }
@@ -1116,6 +1118,7 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
                                         " failed %i\n", __func__, rc);
                                 goto out;
                         }
+                        list_add(&r->mw_all, &buf->rb_all);
                         list_add(&r->mw_list, &buf->rb_mws);
                         ++r;
                 }
@@ -1225,6 +1228,7 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
         while (!list_empty(&buf->rb_mws)) {
                 r = list_entry(buf->rb_mws.next,
                         struct rpcrdma_mw, mw_list);
+                list_del(&r->mw_all);
                 list_del(&r->mw_list);
                 switch (ia->ri_memreg_strategy) {
                 case RPCRDMA_FRMR:
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 84c3455a9521..c1d865287b0e 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -151,7 +151,7 @@ struct rpcrdma_rep {
  * An external memory region is any buffer or page that is registered
  * on the fly (ie, not pre-registered).
  *
- * Each rpcrdma_buffer has a list of these anchored in rb_mws. During
+ * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
  * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
  * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
  * track of registration metadata while each RPC is pending.
@@ -175,6 +175,7 @@ struct rpcrdma_mw {
                 struct rpcrdma_frmr     frmr;
         } r;
         struct list_head        mw_list;
+        struct list_head        mw_all;
 };
 
 /*
@@ -246,6 +247,7 @@ struct rpcrdma_buffer {
         atomic_t        rb_credits;     /* most recent server credits */
         int             rb_max_requests;/* client max requests */
         struct list_head rb_mws;        /* optional memory windows/fmrs/frmrs */
+        struct list_head rb_all;
         int             rb_send_index;
         struct rpcrdma_req      **rb_send_bufs;
         int             rb_recv_index;