If bounce buffers do not fit, defragment mbuf.

Some packets were dropped by vio_encap() when using bounce buffers.
These mbufs are too fragmented for the pre allocated bounce buffer
pages.  By returing EFBIG the network driver will call m_defrag()
and try again.  This fixes the problem.

OK sf@ hshoexer@

diff --git a/sys/arch/amd64/amd64/bus_dma.c b/sys/arch/amd64/amd64/bus_dma.c
index 070c342..56c750e 100644 (file)
--- a/sys/arch/amd64/amd64/bus_dma.c
+++ b/sys/arch/amd64/amd64/bus_dma.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: bus_dma.c,v 1.57 2024/08/22 11:36:24 bluhm Exp $      */
+/*     $OpenBSD: bus_dma.c,v 1.58 2024/08/28 18:21:15 bluhm Exp $      */
 /*     $NetBSD: bus_dma.c,v 1.3 2003/05/07 21:33:58 fvdl Exp $ */
 
 /*-
@@ -726,7 +726,7 @@ _bus_dmamap_load_buffer(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
 
                if (use_bounce_buffer) {
                        if (page >= map->_dm_npages)
-                               return (ENOMEM);
+                               return (EFBIG);
 
                        off = vaddr & PAGE_MASK;
                        pg = map->_dm_pages[page];