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Commit 9b78145c authored by Tom Tucker's avatar Tom Tucker Committed by Trond Myklebust
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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: default avatarTom Tucker <tom@ogc.us>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 4a6862b3

net/sunrpc/xprtrdma/verbs.c

+12 −5
Original line number Diff line number Diff line
@@ -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 :