https://bugs.dpdk.org/show_bug.cgi?id=85
Bug ID: 85
Summary: pci_scan_one() issue
Product: DPDK
Version: 17.11
Hardware: All
OS: Linux
Status: CONFIRMED
Severity: major
Priority: Normal
Component: core
Assignee: dev@dpdk.org
Reporter: geoffrey...@gmail.com
Target Milestone: ---
/* Scan one pci sysfs entry, and fill the devices list from it. */
static int
pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
This function is at drivers/bus/pci/linux/pci.c, and please refer to below
code:
} else { /* already registered */
dev2->kdrv = dev->kdrv;
dev2->max_vfs = dev->max_vfs;
pci_name_set(dev2);
memmove(dev2->mem_resource, dev->mem_resource,
sizeof(dev->mem_resource));
free(dev);
}
If this device is already registered, this function will replace the
mem_resource.
But some devices need to map the PCI resource of a PCI device in virtual
memory, which means dev2->mem_resource[i].addr is not 0, and it's overwritten
here.
When we attach a new device, calling sequence is:
rte_eth_dev_attach()->rte_eal_hotplug_add()->rte_pci_scan()->pci_scan_one()
For already registered devices, mem_resource[i].addr is set to 0, and DPDK will
not invoke rte_pci_map_device() for these devices.
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