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From: Jeff Guo <jia.guo@intel.com>
To: Fang TongHao <fangtonghao@sangfor.com.cn>,
	thomas@monjalon.net, ferruh.yigit@intel.com,
	arybchenko@solarflare.com
Cc: cunming.liang@intel.com, dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] ethdev: fix secondary process change share memory
Date: Fri, 10 Jan 2020 15:30:57 +0800
Message-ID: <b748ade2-6061-55a0-a600-205b14e2ea7b@intel.com> (raw)
In-Reply-To: <20200109122710.1362-1-fangtonghao@sangfor.com.cn>

hi, tonghao


On 1/9/2020 8:27 PM, Fang TongHao wrote:
> Hi all,I am from Sangfor Tech.I found a bug when using DPDK in
> multiprocess scenario.The secondary process enters
> "rte_eth_dev_pci_copy_info" function when initializing.Then it
> sets the value of struct "rte_eth_dev_data.dev_flags" to zero,
> but this struct is shared by primary process and secondary
> process, and the value change is unexpected by primary process.
> This may cause very serious damage.I think
> the secondary process should not enter "rte_eth_dev_pci_copy_info"
> function or changes the value of struct "rte_eth_dev_data.dev_flags"
> in shared memory.
> I fixed this bug by adding an if-statement to forbid the secondary
> process changing the above-mentioned value.
> Thansk, All.


i think the format of commit log should be refined to be more formal 
like as below. what do you think?

ethdev: XXXXXXXXX

XXXXXXXX


> Signed-off-by: Fang TongHao <fangtonghao@sangfor.com.cn>


if it is a fix, suggest to add the line as "Fixes: XXXXXXXX ("ethdev: 
XXXXXXX") to trace it.


> ---
>   lib/librte_ethdev/rte_ethdev_pci.h | 19 ++++++++++---------
>   1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/lib/librte_ethdev/rte_ethdev_pci.h b/lib/librte_ethdev/rte_ethdev_pci.h
> index ccdbb46ec..916de8a14 100644
> --- a/lib/librte_ethdev/rte_ethdev_pci.h
> +++ b/lib/librte_ethdev/rte_ethdev_pci.h
> @@ -59,15 +59,16 @@ rte_eth_copy_pci_info(struct rte_eth_dev *eth_dev,
>   	}
>   
>   	eth_dev->intr_handle = &pci_dev->intr_handle;
> -
> -	eth_dev->data->dev_flags = 0;
> -	if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
> -		eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
> -	if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_RMV)
> -		eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_RMV;
> -
> -	eth_dev->data->kdrv = pci_dev->kdrv;
> -	eth_dev->data->numa_node = pci_dev->device.numa_node;
> +	if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
> +		eth_dev->data->dev_flags = 0;
> +		if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
> +			eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
> +		if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_RMV)
> +			eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_RMV;
> +
> +		eth_dev->data->kdrv = pci_dev->kdrv;
> +		eth_dev->data->numa_node = pci_dev->device.numa_node;


 From the change log, you said that "rte_eth_dev_data.dev_flags" should 
not be touched by secondary process, but you don't mention about

data->kdrv and data->numa_node, could you also explain them in the log 
if they need to process as the same.


> +	}
>   }
>   
>   static inline int

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09 12:27 Fang TongHao
2020-01-10  7:30 ` Jeff Guo [this message]
2020-01-10  7:53   ` 方统浩50450
2020-01-13  5:03 ` [dpdk-dev] [PATCH v2] Fixes: ethdev: secondary process change shared memory Fang TongHao
2020-01-14 14:45   ` Ferruh Yigit
2020-01-15  6:49     ` 方统浩50450
2020-01-15 18:35       ` Ferruh Yigit
2020-01-15 20:43         ` Thomas Monjalon
2020-01-16  7:43           ` Andrew Rybchenko
2020-01-16  9:04             ` Ferruh Yigit
2020-01-16 11:35               ` 方统浩50450
2020-01-16 12:18                 ` Ferruh Yigit
2020-01-17  2:11                   ` 方统浩50450
2020-01-16  9:00           ` Ferruh Yigit
2020-01-17  2:08   ` [dpdk-dev] [PATCH v3] " Fang TongHao
2020-01-17  8:33     ` Andrew Rybchenko
2020-01-17 17:58       ` Ferruh Yigit
  -- strict thread matches above, loose matches on Subject: below --
2020-01-09  3:14 [dpdk-dev] [PATCH] ethdev: fix secondary process change share memory Fang TongHao
2020-01-10 15:32 ` Stephen Hemminger
2020-01-13  3:02   ` 方统浩50450
2020-01-09  2:35 Fang TongHao
2020-01-15 10:30 ` Burakov, Anatoly

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