Author: br
Date: Wed May 29 16:01:34 2019
New Revision: 348364
URL: https://svnweb.freebsd.org/changeset/base/348364
Log:
Don't copy the data from bounce buffer back to the mbuf if channel does
not use bounce buffering.
Sponsored by: DARPA, AFRL
Modified:
head/sys/dev/xdma/xdma_sg.c
Modified: head/sys/dev/xdma/xdma_sg.c
==============================================================================
--- head/sys/dev/xdma/xdma_sg.c Wed May 29 15:53:33 2019 (r348363)
+++ head/sys/dev/xdma/xdma_sg.c Wed May 29 16:01:34 2019 (r348364)
@@ -348,7 +348,8 @@ xchan_seg_done(xdma_channel_t *xchan,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(xchan->dma_tag_bufs, b->map);
} else {
- if (xr->req_type == XR_TYPE_MBUF &&
+ if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0 &&
+ xr->req_type == XR_TYPE_MBUF &&
xr->direction == XDMA_DEV_TO_MEM)
m_copyback(xr->m, 0, st->transferred,
(void *)xr->buf.vaddr);
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