xprtrdma: Make rpcrdma_{un}map_one() into inline functions

These functions are called in a loop for each page transferred via
RDMA READ or WRITE. Extract loop invariants and inline them to
reduce CPU overhead.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

5 files changed, 73 insertions, 46 deletions

diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c
index e8a9837f8d63..a91ba2c8ef1e 100644
--- a/net/sunrpc/xprtrdma/fmr_ops.c
+++ b/net/sunrpc/xprtrdma/fmr_ops.c
@@ -85,6 +85,8 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
            int nsegs, bool writing)
 {
         struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+        struct ib_device *device = ia->ri_id->device;
+        enum dma_data_direction direction = rpcrdma_data_dir(writing);
         struct rpcrdma_mr_seg *seg1 = seg;
         struct rpcrdma_mw *mw = seg1->rl_mw;
         u64 physaddrs[RPCRDMA_MAX_DATA_SEGS];
@@ -97,7 +99,7 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
         if (nsegs > RPCRDMA_MAX_FMR_SGES)
                 nsegs = RPCRDMA_MAX_FMR_SGES;
         for (i = 0; i < nsegs;) {
-                rpcrdma_map_one(ia, seg, writing);
+                rpcrdma_map_one(device, seg, direction);
                 physaddrs[i] = seg->mr_dma;
                 len += seg->mr_len;
                 ++seg;
@@ -123,7 +125,7 @@ out_maperr:
                 __func__, len, (unsigned long long)seg1->mr_dma,
                 pageoff, i, rc);
         while (i--)
-                rpcrdma_unmap_one(ia, --seg);
+                rpcrdma_unmap_one(device, --seg);
         return rc;
 }
 
@@ -135,14 +137,16 @@ fmr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
 {
         struct rpcrdma_ia *ia = &r_xprt->rx_ia;
         struct rpcrdma_mr_seg *seg1 = seg;
+        struct ib_device *device;
         int rc, nsegs = seg->mr_nsegs;
         LIST_HEAD(l);
 
         list_add(&seg1->rl_mw->r.fmr->list, &l);
         rc = ib_unmap_fmr(&l);
         read_lock(&ia->ri_qplock);
+        device = ia->ri_id->device;
         while (seg1->mr_nsegs--)
-                rpcrdma_unmap_one(ia, seg++);
+                rpcrdma_unmap_one(device, seg++);
         read_unlock(&ia->ri_qplock);
         if (rc)
                 goto out_err;
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index ea59c1b435ff..0a7b9df70133 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -178,6 +178,8 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
             int nsegs, bool writing)
 {
         struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+        struct ib_device *device = ia->ri_id->device;
+        enum dma_data_direction direction = rpcrdma_data_dir(writing);
         struct rpcrdma_mr_seg *seg1 = seg;
         struct rpcrdma_mw *mw = seg1->rl_mw;
         struct rpcrdma_frmr *frmr = &mw->r.frmr;
@@ -197,7 +199,7 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
         if (nsegs > ia->ri_max_frmr_depth)
                 nsegs = ia->ri_max_frmr_depth;
         for (page_no = i = 0; i < nsegs;) {
-                rpcrdma_map_one(ia, seg, writing);
+                rpcrdma_map_one(device, seg, direction);
                 pa = seg->mr_dma;
                 for (seg_len = seg->mr_len; seg_len > 0; seg_len -= PAGE_SIZE) {
                         frmr->fr_pgl->page_list[page_no++] = pa;
@@ -247,7 +249,7 @@ out_senderr:
         ib_update_fast_reg_key(mr, --key);
         frmr->fr_state = FRMR_IS_INVALID;
         while (i--)
-                rpcrdma_unmap_one(ia, --seg);
+                rpcrdma_unmap_one(device, --seg);
         return rc;
 }
 
@@ -261,6 +263,7 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
         struct rpcrdma_ia *ia = &r_xprt->rx_ia;
         struct ib_send_wr invalidate_wr, *bad_wr;
         int rc, nsegs = seg->mr_nsegs;
+        struct ib_device *device;
 
         seg1->rl_mw->r.frmr.fr_state = FRMR_IS_INVALID;
 
@@ -271,8 +274,9 @@ frwr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
         DECR_CQCOUNT(&r_xprt->rx_ep);
 
         read_lock(&ia->ri_qplock);
+        device = ia->ri_id->device;
         while (seg1->mr_nsegs--)
-                rpcrdma_unmap_one(ia, seg++);
+                rpcrdma_unmap_one(device, seg++);
         rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr);
         read_unlock(&ia->ri_qplock);
         if (rc)
diff --git a/net/sunrpc/xprtrdma/physical_ops.c b/net/sunrpc/xprtrdma/physical_ops.c
index 0ba130bed1fc..ba518af16787 100644
--- a/net/sunrpc/xprtrdma/physical_ops.c
+++ b/net/sunrpc/xprtrdma/physical_ops.c
@@ -50,7 +50,8 @@ physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
 {
         struct rpcrdma_ia *ia = &r_xprt->rx_ia;
 
-        rpcrdma_map_one(ia, seg, writing);
+        rpcrdma_map_one(ia->ri_id->device, seg,
+                        rpcrdma_data_dir(writing));
         seg->mr_rkey = ia->ri_bind_mem->rkey;
         seg->mr_base = seg->mr_dma;
         seg->mr_nsegs = 1;
@@ -62,7 +63,12 @@ physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
 static int
 physical_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
 {
-        rpcrdma_unmap_one(&r_xprt->rx_ia, seg);
+        struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+
+        read_lock(&ia->ri_qplock);
+        rpcrdma_unmap_one(ia->ri_id->device, seg);
+        read_unlock(&ia->ri_qplock);
+
         return 1;
 }
 
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index cac06f290a26..4870d272e006 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1436,6 +1436,14 @@ rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
  * Wrappers for internal-use kmalloc memory registration, used by buffer code.
  */
 
+void
+rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg)
+{
+        dprintk("RPC:       map_one: offset %p iova %llx len %zu\n",
+                seg->mr_offset,
+                (unsigned long long)seg->mr_dma, seg->mr_dmalen);
+}
+
 static int
 rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len,
                                 struct ib_mr **mrp, struct ib_sge *iov)
@@ -1561,42 +1569,6 @@ rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
 }
 
 /*
- * Wrappers for chunk registration, shared by read/write chunk code.
- */
-
-void