[dpdk-dev] [PATCH] lib/eal: resolve address conflicts
Burakov, Anatoly
anatoly.burakov at intel.com
Mon Nov 4 11:14:52 CET 2019
On 04-Nov-19 6:32 AM, Wangyu (Turing Solution Development Dep) wrote:
>
> Resolve address conflicts on 64K pagesize without base_virtaddr, which cause new address conflicts in eal_get_virtual_area().
>
> Signed-off-by: Beard-627 <dengxiaofeng at huawei.com>
> Acked-by: Eric wang <seven.wangyu at huawei.com>
> Acked-by: Wei Hu <xavier.huwei at huawei.com>
> Acked-by: Min Hu <humin29 at huawei.com>
> ---
> lib/librte_eal/linux/eal/eal.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/lib/librte_eal/linux/eal/eal.c b/lib/librte_eal/linux/eal/eal.c index 946222c..c15d406 100644
> --- a/lib/librte_eal/linux/eal/eal.c
> +++ b/lib/librte_eal/linux/eal/eal.c
> @@ -360,6 +360,28 @@ enum rte_iova_mode
> return -1;
> }
>
> + if ((getpagesize() == RTE_PGSIZE_64K) &&
> + (internal_config.base_virtaddr == 0)) {
> +
> + munmap(rte_mem_cfg_addr, sizeof(*rte_config.mem_config));
> + rte_mem_cfg_addr = (void *)RTE_PTR_ALIGN_CEIL(
> + (uintptr_t)rte_mem_cfg_addr, (size_t)RTE_PGSIZE_16M);
> + rte_mem_cfg_addr = (void *)RTE_ALIGN_FLOOR(
> + (uintptr_t)rte_mem_cfg_addr -
> + sizeof(*rte_config.mem_config), sysconf(_SC_PAGE_SIZE));
Please use RTE_PTR_ADD and RTE_PTR_DIFF to perform pointer arithmetic.
> +
> + rte_mem_cfg_addr = mmap(rte_mem_cfg_addr,
> + sizeof(*rte_config.mem_config),
> + PROT_READ | PROT_WRITE, MAP_SHARED, mem_cfg_fd, 0);
> +
> + if (rte_mem_cfg_addr == MAP_FAILED) {
> + close(mem_cfg_fd);
> + mem_cfg_fd = -1;
> + RTE_LOG(ERR, EAL, "Cannot mmap memory for rte_config\n");
> + return -1;
> + }
> + }
> +
> memcpy(rte_mem_cfg_addr, &early_mem_config, sizeof(early_mem_config));
> rte_config.mem_config = rte_mem_cfg_addr;
>
> --
> 1.8.3.1
>
The patch requires a bit more explanation - what exactly is the problem,
and why the solution is as above? Also, did you test it on the latest
master, since the eal_get_virtal_area() patches [1] got merged?
[1] http://patches.dpdk.org/project/dpdk/list/?series=7043&state=*
--
Thanks,
Anatoly
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