xprtrdma: Remove assumption that each segment is <= PAGE_SIZE

The xprtrdma FRMR mapping logic assumes that a segment is <= PAGE_SIZE.
This is not true for NFS4.

Signed-off-by: Tom Tucker <tom@ogc.us>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 28236bab57f9..745973b729af 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1490,6 +1490,9 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
         u8 key;
         int len, pageoff;
         int i, rc;
+        int seg_len;
+        u64 pa;
+        int page_no;
 
         pageoff = offset_in_page(seg1->mr_offset);
         seg1->mr_offset -= pageoff;     /* start of page */
@@ -1497,11 +1500,15 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
         len = -pageoff;
         if (*nsegs > RPCRDMA_MAX_DATA_SEGS)
                 *nsegs = RPCRDMA_MAX_DATA_SEGS;
-        for (i = 0; i < *nsegs;) {
+        for (page_no = i = 0; i < *nsegs;) {
                 rpcrdma_map_one(ia, seg, writing);
-                seg1->mr_chunk.rl_mw->r.frmr.fr_pgl->page_list[i] = seg->mr_dma;
+                pa = seg->mr_dma;
+                for (seg_len = seg->mr_len; seg_len > 0; seg_len -= PAGE_SIZE) {
+                        seg1->mr_chunk.rl_mw->r.frmr.fr_pgl->
+                                page_list[page_no++] = pa;
+                        pa += PAGE_SIZE;
+                }
                 len += seg->mr_len;
-                BUG_ON(seg->mr_len > PAGE_SIZE);
                 ++seg;
                 ++i;
                 /* Check for holes */
@@ -1540,9 +1547,9 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
         frmr_wr.send_flags = IB_SEND_SIGNALED;
         frmr_wr.wr.fast_reg.iova_start = seg1->mr_dma;
         frmr_wr.wr.fast_reg.page_list = seg1->mr_chunk.rl_mw->r.frmr.fr_pgl;
-        frmr_wr.wr.fast_reg.page_list_len = i;
+        frmr_wr.wr.fast_reg.page_list_len = page_no;
         frmr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
-        frmr_wr.wr.fast_reg.length = i << PAGE_SHIFT;
+        frmr_wr.wr.fast_reg.length = page_no << PAGE_SHIFT;
         BUG_ON(frmr_wr.wr.fast_reg.length < len);
         frmr_wr.wr.fast_reg.access_flags = (writing ?
                                 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :