svn commit: r265573 - stable/10/sys/dev/nvme

[Jim Harris]

Author: jimharris
Date: Wed May  7 17:02:15 2014
New Revision: 265573
URL: http://svnweb.freebsd.org/changeset/base/265573

Log:
  MFC r263278:
  
  nvme:  NVMe specification dictates 4-byte alignment for PRPs (not 8).

Modified:
  stable/10/sys/dev/nvme/nvme_qpair.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/dev/nvme/nvme_qpair.c
==============================================================================
--- stable/10/sys/dev/nvme/nvme_qpair.c	Wed May  7 17:00:39 2014	(r265572)
+++ stable/10/sys/dev/nvme/nvme_qpair.c	Wed May  7 17:02:15 2014	(r265573)
@@ -498,8 +498,9 @@ nvme_qpair_construct(struct nvme_qpair *
 
 	mtx_init(&qpair->lock, "nvme qpair lock", NULL, MTX_DEF);
 
+	/* Note: NVMe PRP format is restricted to 4-byte alignment. */
 	bus_dma_tag_create(bus_get_dma_tag(ctrlr->dev),
-	    sizeof(uint64_t), PAGE_SIZE, BUS_SPACE_MAXADDR,
+	    4, PAGE_SIZE, BUS_SPACE_MAXADDR,
 	    BUS_SPACE_MAXADDR, NULL, NULL, NVME_MAX_XFER_SIZE,
 	    (NVME_MAX_XFER_SIZE/PAGE_SIZE)+1, PAGE_SIZE, 0,
 	    NULL, NULL, &qpair->dma_tag);