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 <fangtong...@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
