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From: Stephen Hemminger <stephen@networkplumber.org>
To: Fang TongHao <fangtonghao@sangfor.com.cn>
Cc: thomas@monjalon.net, ferruh.yigit@intel.com,
	arybchenko@solarflare.com, dev@dpdk.org, stable@dpdk.org,
	cunming.liang@intel.com, jia.guo@intel.com
Subject: Re: [dpdk-dev] [PATCH] ethdev: fix secondary process change share memory
Date: Fri, 10 Jan 2020 07:32:15 -0800
Message-ID: <20200110073215.09ad9a6f@hermes.lan> (raw)
In-Reply-To: <20200109031425.1338-1-fangtonghao@sangfor.com.cn>

On Thu,  9 Jan 2020 11:14:25 +0800
Fang TongHao <fangtonghao@sangfor.com.cn> 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.
> 
> Signed-off-by: Fang TongHao <fangtonghao@sangfor.com.cn>

Most of the drivers avoid calling rte_eth_dev_pci_copy_info
in the secondary process, which one are you using?

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09  3:14 Fang TongHao
2020-01-10 15:32 ` Stephen Hemminger [this message]
2020-01-13  3:02   ` 方统浩50450
  -- strict thread matches above, loose matches on Subject: below --
2020-01-09 12:27 Fang TongHao
2020-01-10  7:30 ` Jeff Guo
2020-01-10  7:53   ` 方统浩50450
2020-01-09  2:35 Fang TongHao
2020-01-15 10:30 ` Burakov, Anatoly

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