[dpdk-dev,1/3] eal/linux: add function for checking hugepages within device supported address range

  - This is needed for avoiding problems with devices not being able to address
   all the physical available memory.

Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
---
 lib/librte_eal/common/include/rte_memory.h |  6 ++++++
 lib/librte_eal/linuxapp/eal/eal_memory.c   | 27 +++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
  

On Thu, 12 May 2016 15:33:58 +0100
"Alejandro.Lucero" <alejandro.lucero@netronome.com> wrote:

> - This is needed for avoiding problems with devices not being able to address
>    all the physical available memory.

WARNING:COMMIT_LOG_LONG_LINE: Possible unwrapped commit description (prefer a maximum 75 chars per line)
#14: 
- This is needed for avoiding problems with devices not being able to address

WARNING:LONG_LINE: line over 80 characters
#57: FILE: lib/librte_eal/linuxapp/eal/eal_memory.c:1048:
+	const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;

ERROR:SPACING: spaces required around that '=' (ctx:WxV)
#59: FILE: lib/librte_eal/linuxapp/eal/eal_memory.c:1050:
+	int i =0;
 	      ^

WARNING:LONG_LINE_STRING: line over 80 characters
#63: FILE: lib/librte_eal/linuxapp/eal/eal_memory.c:1054:
+		RTE_LOG(DEBUG, EAL, "Checking page with address %"PRIx64" and device"

WARNING:LONG_LINE_STRING: line over 80 characters
#66: FILE: lib/librte_eal/linuxapp/eal/eal_memory.c:1057:
+			RTE_LOG(ERR, EAL, "Allocated hugepages are out of device address"

total: 1 errors, 4 warnings, 45 lines checked

Regards
Jan

> 
> Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
> 
> ---
> lib/librte_eal/common/include/rte_memory.h |  6 ++++++
>  lib/librte_eal/linuxapp/eal/eal_memory.c   | 27 +++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/lib/librte_eal/common/include/rte_memory.h b/lib/librte_eal/common/include/rte_memory.h
> index f8dbece..67b0b28 100644
> --- a/lib/librte_eal/common/include/rte_memory.h
> +++ b/lib/librte_eal/common/include/rte_memory.h
> @@ -256,6 +256,12 @@ rte_mem_phy2mch(uint32_t memseg_id __rte_unused, const phys_addr_t phy_addr)
>  }
>  #endif
>  
> +/**
> + * Check hugepages are within the supported
> + * device address space range.
> + */
> +int rte_eal_hugepage_check_address_mask(uint64_t dma_mask);
> +
>  #ifdef __cplusplus
>  }
>  #endif
> diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
> index 5b9132c..2cd046d 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_memory.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
> @@ -1037,6 +1037,33 @@ calc_num_pages_per_socket(uint64_t * memory,
>  }
>  
>  /*
> + * Some devices have addressing limitations. A PMD will indirectly call this
> + * function raising an error if any hugepage is out of address range supported.
> + * As hugepages are ordered by physical address, there is nothing to do as
> + * any other hugepage available will be out of range as well.
> + */
> +int
> +rte_eal_hugepage_check_address_mask(uint64_t dma_mask)
> +{
> +	const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
> +	phys_addr_t physaddr;
> +	int i =0;
> +
> +	while (i < RTE_MAX_MEMSEG && mcfg->memseg[i].len > 0) {
> +		physaddr = mcfg->memseg[i].phys_addr + mcfg->memseg[i].len;
> +		RTE_LOG(DEBUG, EAL, "Checking page with address %"PRIx64" and device"
> +				" mask 0x%"PRIx64"\n", physaddr, dma_mask);
> +		if (physaddr & ~dma_mask) {
> +			RTE_LOG(ERR, EAL, "Allocated hugepages are out of device address"
> +					" range.");
> +			return -1;
> +		}
> +		i++;
> +	}
> +	return 0;
> +}
> +
> +/*
>   * Prepare physical memory mapping: fill configuration structure with
>   * these infos, return 0 on success.
>   *  1. map N huge pages in separate files in hugetlbfs