In 64K pagesize system, DPDK will read the size NIC need in uio/uio1/maps/map1/size, when the size small than pagesize(e.g.,82599 is 16K), dev->mem_resource[i].len will be 16K, but the mmap function applies for at least 1 page size, which is 64K. Then second NIC mmap, start address is first NIC address + 16K, which already used by first NIC. So if change the size to first NIC address + 64K, problem solved.
-----邮件原件----- 发件人: David Marchand [mailto:[email protected]] 发送时间: 2019年11月5日 22:33 收件人: Wangyu (Turing Solution Development Dep) <[email protected]> 抄送: [email protected]; [email protected]; Linuxarm <[email protected]>; humin (Q) <[email protected]>; Liyuan (Larry) <[email protected]>; dengxiaofeng <[email protected]> 主题: Re: [dpdk-dev] [PATCH v2] bus/pci: resolve multiple NICs address conflicts On Tue, Nov 5, 2019 at 8:27 AM Wangyu (Turing Solution Development Dep) <[email protected]> wrote: > > > NIC address conflicts on 64K pagesize when using multiple NICs, as > system will mmap 64K pagesize for NIC, but dev->mem_resource[i].len is > 16K. Please, can you describe the problem you want to fix? Is this a problem specific to a pci device you are using? Thanks. > > Signed-off-by: Beard-627 <[email protected]> > Signed-off-by: Eric wang <[email protected]> > Acked-by: Wei Hu <[email protected]> > Acked-by: Min Hu <[email protected]> > --- > drivers/bus/pci/linux/pci.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/bus/pci/linux/pci.c b/drivers/bus/pci/linux/pci.c > index 43debaa..afaa68d 100644 > --- a/drivers/bus/pci/linux/pci.c > +++ b/drivers/bus/pci/linux/pci.c > @@ -201,6 +201,11 @@ > if (flags & IORESOURCE_MEM) { > dev->mem_resource[i].phys_addr = phys_addr; > dev->mem_resource[i].len = end_addr - > phys_addr + 1; > + if (dev->mem_resource[i].len < > + (unsigned int)getpagesize()) > + > + dev->mem_resource[i].len = > + (unsigned int)getpagesize(); > /* not mapped for now */ > dev->mem_resource[i].addr = NULL; > } > -- > 1.8.3.1 -- David Marchand
