On Fri, Jun 11, 2010 at 11:06:06AM -0700, Marcel Moolenaar wrote: > > On Jun 11, 2010, at 10:50 AM, Pyun YongHyeon wrote: > > >>>> > >>>> I'm not clear why you even need bounce buffers for RX. The chip > >>>> supports 64bit addresses with no boundary or alignment restrictions. > >>>> > >>> > >>> Some controllers have 4G boundary bug so bge(4) restricts dma > >>> address space. > >> > >> That limitation should be reflected in the boundary attribute of the tag, > >> not the lowaddr/highaddr attributes. > >> > > > > Yes, but that needed more code. And I don't have these buggy > > controllers so I chose more simple way that would work even though > > it may be inefficient. > > Do you happen to know if one or both of the hardware I have access to > is the "buggy" hardware? >
Yes, both devices below can not handle 4GB boundary crossing in DMA state machine. > b...@pci0:32:2:0: class=0x020000 card=0x12a4103c chip=0x164514e4 rev=0x15 > hdr=0x00 > vendor = 'Broadcom Corporation' > device = 'broadtcomBCM5701 Gigabit Ethernet (BCM5701)' > class = network > subclass = ethernet > bar [10] = type Memory, range 64, base 0x90800000, size 65536, enabled > cap 07[40] = PCI-X 64-bit supports 133MHz, 512 burst read, 1 split > transaction > cap 01[48] = powerspec 2 supports D0 D3 current D0 > cap 03[50] = VPD > cap 05[58] = MSI supports 8 messages, 64 bit > > b...@pci0:1:2:0: class=0x020000 card=0x1311103c chip=0x164814e4 rev=0x10 > hdr=0x00 > vendor = 'Broadcom Corporation' > device = 'NetXtreme Dual Gigabit Adapter (BCM5704)' > class = network > subclass = ethernet > bar [10] = type Memory, range 64, base 0xa0450000, size 65536, enabled > cap 07[40] = PCI-X 64-bit supports 133MHz, 2048 burst read, 1 split > transaction > cap 01[48] = powerspec 2 supports D0 D3 current D0 > cap 03[50] = VPD > cap 05[58] = MSI supports 8 messages, 64 bit > > -- > Marcel Moolenaar > xcl...@mac.com > > > _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
