[dpdk-dev,3/5] xen: add phys-addr command line argument

  Allow overriding default Xen DOM0 behavior to
use physical addresses insted of mfn

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
v2 -- no changes

 lib/librte_eal/common/eal_common_options.c |  5 +++++
 lib/librte_eal/common/eal_internal_cfg.h   |  1 +
 lib/librte_eal/common/eal_options.h        |  2 ++
 lib/librte_eal/common/include/rte_memory.h |  3 +++
 lib/librte_eal/linuxapp/eal/eal_memory.c   |  5 +++++
 lib/librte_mempool/rte_dom0_mempool.c      | 10 ++++++++--
 6 files changed, 24 insertions(+), 2 deletions(-)
  

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Stephen Hemminger
> Sent: Sunday, February 15, 2015 11:25 PM
> To: dev@dpdk.org
> Cc: Stephen Hemminger
> Subject: [dpdk-dev] [PATCH 3/5] xen: add phys-addr command line argument
> 
> Allow overriding default Xen DOM0 behavior to use physical addresses insted of
> mfn

If the application is built with DOM0 support , the application will run in non Dom0 environment when using the new argument, correct?

> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
> v2 -- no changes
> 
>  lib/librte_eal/common/eal_common_options.c |  5 +++++
>  lib/librte_eal/common/eal_internal_cfg.h   |  1 +
>  lib/librte_eal/common/eal_options.h        |  2 ++
>  lib/librte_eal/common/include/rte_memory.h |  3 +++
>  lib/librte_eal/linuxapp/eal/eal_memory.c   |  5 +++++
>  lib/librte_mempool/rte_dom0_mempool.c      | 10 ++++++++--
>  6 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/librte_eal/common/eal_common_options.c
> b/lib/librte_eal/common/eal_common_options.c
> index 67e02dc..1742364 100644
> --- a/lib/librte_eal/common/eal_common_options.c
> +++ b/lib/librte_eal/common/eal_common_options.c
> @@ -83,6 +83,7 @@ eal_long_options[] = {
>  	{OPT_LOG_LEVEL, 1, NULL, OPT_LOG_LEVEL_NUM},
>  	{OPT_BASE_VIRTADDR, 1, 0, OPT_BASE_VIRTADDR_NUM},
>  	{OPT_XEN_DOM0, 0, 0, OPT_XEN_DOM0_NUM},
> +	{OPT_XEN_PHYS_ADDR, 0, 0, OPT_XEN_PHYS_ADDR_NUM},
>  	{OPT_CREATE_UIO_DEV, 1, NULL, OPT_CREATE_UIO_DEV_NUM},
>  	{OPT_VFIO_INTR, 1, NULL, OPT_VFIO_INTR_NUM},
>  	{0, 0, 0, 0}
> @@ -491,6 +492,10 @@ eal_parse_common_option(int opt, const char
> *optarg,
>  		}
>  		conf->log_level = log;
>  		break;
> +
> +	case OPT_XEN_PHYS_ADDR_NUM:
> +		conf->xen_phys_addr_support = 1;
> +		break;
>  	}
> 
>  	/* don't know what to do, leave this to caller */ diff --git
> a/lib/librte_eal/common/eal_internal_cfg.h
> b/lib/librte_eal/common/eal_internal_cfg.h
> index e2ecb0d..41b4169 100644
> --- a/lib/librte_eal/common/eal_internal_cfg.h
> +++ b/lib/librte_eal/common/eal_internal_cfg.h
> @@ -65,6 +65,7 @@ struct internal_config {
>  	volatile unsigned force_nrank;    /**< force number of ranks */
>  	volatile unsigned no_hugetlbfs;   /**< true to disable hugetlbfs */
>  	volatile unsigned xen_dom0_support; /**< support app running on Xen
> Dom0*/
> +	volatile unsigned xen_phys_addr_support; /**< support phys addr */
>  	volatile unsigned no_pci;         /**< true to disable PCI */
>  	volatile unsigned no_hpet;        /**< true to disable HPET */
>  	volatile unsigned vmware_tsc_map; /**< true to use VMware TSC
> mapping diff --git a/lib/librte_eal/common/eal_options.h
> b/lib/librte_eal/common/eal_options.h
> index e476f8d..8aee959 100644
> --- a/lib/librte_eal/common/eal_options.h
> +++ b/lib/librte_eal/common/eal_options.h
> @@ -73,6 +73,8 @@ enum {
>  	OPT_BASE_VIRTADDR_NUM,
>  #define OPT_XEN_DOM0    "xen-dom0"
>  	OPT_XEN_DOM0_NUM,
> +#define OPT_XEN_PHYS_ADDR "xen-phys-addr"
> +	OPT_XEN_PHYS_ADDR_NUM,
>  #define OPT_CREATE_UIO_DEV "create-uio-dev"
>  	OPT_CREATE_UIO_DEV_NUM,
>  #define OPT_VFIO_INTR    "vfio-intr"
> diff --git a/lib/librte_eal/common/include/rte_memory.h
> b/lib/librte_eal/common/include/rte_memory.h
> index ab6c1ff..c3b8a98 100644
> --- a/lib/librte_eal/common/include/rte_memory.h
> +++ b/lib/librte_eal/common/include/rte_memory.h
> @@ -180,6 +180,9 @@ unsigned rte_memory_get_nrank(void);  /**< Internal
> use only - should DOM0 memory mapping be used */  extern int
> is_xen_dom0_supported(void);
> 
> +/**< Internal use only - should DOM0 use physical addresses insted of
> +mfn */ extern int is_xen_phys_addr_supported(void);
> +
>  /**
>   * Return the physical address of elt, which is an element of the pool mp.
>   *
> diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c
> b/lib/librte_eal/linuxapp/eal/eal_memory.c
> index 4afda2a..a759ac9 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_memory.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
> @@ -103,6 +103,11 @@ int is_xen_dom0_supported(void)  {
>  	return internal_config.xen_dom0_support;  }
> +
> +int is_xen_phys_addr_supported(void)
> +{
> +	return internal_config.xen_phys_addr_support;
> +}
>  #endif
> 
>  /**
> diff --git a/lib/librte_mempool/rte_dom0_mempool.c
> b/lib/librte_mempool/rte_dom0_mempool.c
> index 9ec68fb..ab35826 100644
> --- a/lib/librte_mempool/rte_dom0_mempool.c
> +++ b/lib/librte_mempool/rte_dom0_mempool.c
> @@ -74,8 +74,14 @@ get_phys_map(void *va, phys_addr_t pa[], uint32_t
> pg_num,
>      virt_addr =(uintptr_t) mcfg->memseg[memseg_id].addr;
> 
>      for (i = 0; i != pg_num; i++) {
> -        mfn_id = ((uintptr_t)va + i * pg_sz - virt_addr) / RTE_PGSIZE_2M;
> -        pa[i] = mcfg->memseg[memseg_id].mfn[mfn_id] * page_size;
> +	if (!is_xen_phys_addr_supported()) {
> +		mfn_id = ((uintptr_t)va + i * pg_sz -
> +				virt_addr) / RTE_PGSIZE_2M;
> +		pa[i] = mcfg->memseg[memseg_id].mfn[mfn_id] * page_size;
> +	} else {
> +		pa[i] = mcfg->memseg[memseg_id].phys_addr + i * pg_sz +
> +			(uintptr_t)va - virt_addr;
> +	}
>      }
>  }
> 
> --
> 2.1.4
  

On Thu, 26 Feb 2015 07:55:13 +0000
"Liu, Jijiang" <jijiang.liu@intel.com> wrote:

> If the application is built with DOM0 support , the application will run in non Dom0 environment when using the new argument, correct?

Yes.

Our startup script has

    if [ -d /proc/xen ] ; then
        log_progress_msg "xen_uio"
        modprobe xen_uio
        if [ "$(cat /proc/xen/domain)" == "pv" ]; then
            log_progress_msg "rte_dom0_mm"
            modprobe rte_dom0_mm xen_phys_addr=y
            set_domU_memsize
            XEN_ARGS="--xen-dom0 --xen-phys-addr"
        fi
    fi