Re: [Xen-devel] [dpdk-dev] could not l2fwd in DOM0

[Thomas Monjalon <thomas.monjalon@xxxxxxxxx>]

Jijiang, I'm not sure to understand.
Could you send a proper patch for this issue?

Thanks
-- 
Thomas


2014-05-17 07:48, Liu, Jijiang:
> In Linux kernel versions < 3.14 , the vstart is kernel virtual address, the
> API prototype below. int xen_create_contiguous_region(unsigned long vstart,
> unsigned int order, unsigned int address_bits)
> 
> In Linux kernel 3.14, the pstart is kernel physical address, the API
> prototype below. int xen_create_contiguous_region(phys_addr_t pstart,
> unsigned int order, unsigned int address_bits,
>                                dma_addr_t *dma_handle)
> 
> ,so the mm_data->block_info[i].vir_addr cannot pass to
> xen_create_contiguous_region() directly for Linux kernel 3.14, the pstart
> should be mm_data->block_info[i].pfn * PAGE_SIZE in the Dom0 Driver.
> 
> #include <linux/errno.h>
>  #include <linux/vmalloc.h>
>  #include <linux/mm.h>
> 
>  #include <xen/xen.h>
>  #include <xen/page.h>
> @@ -309,6 +310,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct
> dom0_mm_data uint64_t pfn, vstart, vaddr;
>         uint32_t i, num_block, size;
>         int idx;
> +       dma_addr_t dma_handle;
> 
>         /* Allocate 2M memory once */
>         num_block = meminfo->size / 2;
> @@ -344,7 +346,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct
> dom0_mm_data * contiguous physical addresses, its maximum size is 2M. */
>                 if (xen_create_contiguous_region(mm_data->block_info[i].pfn
> * PAGE_SIZE, -                                   DOM0_CONTIG_NUM_ORDER, 0)
> == 0) { +                                   DOM0_CONTIG_NUM_ORDER, 0,
> + &dma_handle) == 0) {
>                         mm_data->block_info[i].exchange_flag = 1;
>                         mm_data->block_info[i].mfn =
>                                 pfn_to_mfn(mm_data->block_info[i].pfn);
> 
> Thanks
> Frank Liu
> 
> -----Original Message-----
> From: dev [mailto:dev-bounces@xxxxxxxx] On Behalf Of Samuel Monderer
> Sent: Wednesday, May 07, 2014 8:44 PM
> To: Liu, Jijiang
> Cc: dev@xxxxxxxx
> Subject: Re: [dpdk-dev] could not l2fwd in DOM0
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@xxxxxxxx] On Behalf Of Liu, Jijiang
> > Sent: Wednesday, May 07, 2014 7:36 AM
> > To: dev@xxxxxxxx
> > Subject: Re: [dpdk-dev] could not l2fwd in DOM0
> > 
> > Hi,
> > 
> > I have checked source codes of xen_create_contiguous_region function
> > in kernel 3.14, and found the dma_handle cannot be NULL.
> > 
> > int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
> > 
> >                                  unsigned int address_bits,
> >                                  dma_addr_t *dma_handle) {
> >         
> >         unsigned long *in_frames = discontig_frames, out_frame;
> >         unsigned long  flags;
> >         int            success;
> >         unsigned long vstart = (unsigned long)phys_to_virt(pstart);
> >     
> >     ...
> >     
> >         *dma_handle = virt_to_machine(vstart).maddr;
> >         return success ? 0 : -ENOMEM;
> > 
> > }
> > 
> > Thanks
> > Frank Liu
> 
> Thanks Frank,
> 
> I've changed the code as following but now the kernel module crashes.
> 
> diff --git a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
> b/lib/librte_eal/linuxapp/xen index 87fa3e6..8addc21 100644
> --- a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
> +++ b/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
> @@ -64,6 +64,7 @@
>  #include <linux/errno.h>
>  #include <linux/vmalloc.h>
>  #include <linux/mm.h>
> 
>  #include <xen/xen.h>
>  #include <xen/page.h>
> @@ -309,6 +310,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct
> dom0_mm_data uint64_t pfn, vstart, vaddr;
>         uint32_t i, num_block, size;
>         int idx;
> +       dma_addr_t dma_handle;
> 
>         /* Allocate 2M memory once */
>         num_block = meminfo->size / 2;
> @@ -344,7 +346,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct
> dom0_mm_data * contiguous physical addresses, its maximum size is 2M. */
>                 if
> (xen_create_contiguous_region(mm_data->block_info[i].vir_addr,
> -                                   DOM0_CONTIG_NUM_ORDER, 0) == 0) {
> +                                   DOM0_CONTIG_NUM_ORDER, 0,
> + &dma_handle) == 0) {
>                         mm_data->block_info[i].exchange_flag = 1;
>                         mm_data->block_info[i].mfn =
>                                 pfn_to_mfn(mm_data->block_info[i].pfn);
> 
> Samuel
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@xxxxxxxx] On Behalf Of Samuel Monderer
> > Sent: Wednesday, April 30, 2014 1:54 AM
> > To: dev@xxxxxxxx<mailto:dev@xxxxxxxx>
> > Cc: Shimon Zadok
> > Subject: [dpdk-dev] could not l2fwd in DOM0
> > 
> > Hi,
> > 
> > First I've encountered a compiling problem when compiling for DOM0 due
> > to prototype change of the function xen_create_contiguous_region I
> > made the following changes:
> > 
> > diff --git a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
> > b/lib/librte_eal/linuxapp/xen index 87fa3e6..8addc21 100644
> > --- a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
> > +++ b/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
> > @@ -64,6 +64,7 @@
> > 
> >  #include <linux/errno.h>
> >  #include <linux/vmalloc.h>
> >  #include <linux/mm.h>
> > 
> > +//#include <linux/types.h>
> > 
> >  #include <xen/xen.h>
> >  #include <xen/page.h>
> > 
> > @@ -309,6 +310,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo,
> > struct dom0_mm_data
> > 
> >         uint64_t pfn, vstart, vaddr;
> >         uint32_t i, num_block, size;
> >         int idx;
> > 
> > +       dma_addr_t *dma_handle = NULL;
> > 
> >         /* Allocate 2M memory once */
> >         num_block = meminfo->size / 2; @@ -344,7 +346,7 @@
> > 
> > dom0_prepare_memsegs(struct memory_info* meminfo, struct dom0_mm_data
> > 
> >                  * contiguous physical addresses, its maximum size is 2M.
> >                  */
> >                 
> >                 if
> >                 (xen_create_contiguous_region(mm_data->block_info[i].vir_
> >                 addr,
> > 
> > -                                   DOM0_CONTIG_NUM_ORDER, 0) == 0) {
> > +                                   DOM0_CONTIG_NUM_ORDER, 0,
> > + dma_handle) == 0) {
> > 
> >                         mm_data->block_info[i].exchange_flag = 1;
> >                         mm_data->block_info[i].mfn =
> > 
> > pfn_to_mfn(mm_data->block_info[i].pfn);
> > 
> > After that I tried to run l2fwd example and got a segmentation fault
> > 
> > root@Smart:~/samuelm/dpdk/dpdk# modprobe uio
> > root@Smart:~/samuelm/dpdk/dpdk# insmod ./x86_64-default-linuxapp-
> > gcc/kmod/igb_uio.ko root@Smart:~/samuelm/dpdk/dpdk# insmod
> > ./x86_64-default-linuxapp- gcc/kmod/rte_dom0_mm.ko
> > root@Smart:~/samuelm/dpdk/dpdk# cd examples/l2fwd/build/
> > root@Smart:~/samuelm/dpdk/dpdk/examples/l2fwd/build# echo 2048 >
> > /sys/kernel/mm/dom0-mm/memsize-mB/memsize
> > root@Smart:~/samuelm/dpdk/dpdk/examples/l2fwd/build# ./l2fwd -c 3 -n 4
> > --xen-dom0 -- -q 1 -p 3
> > EAL: Detected lcore 0 as core 0 on socket 0
> > EAL: Detected lcore 1 as core 0 on socket 0
> > EAL: Setting up memory...
> > Segmentation fault
> > root@Smart:~/samuelm/dpdk/dpdk/examples/l2fwd/build#
> > 
> > Has anyone already encountered this problem?
> > 
> > Samuelm


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