[dpdk-dev] Question about “PCI memorymmap”

[陈毅强 <chenyq3@wangsu.com>]

Hi,ALL

  We fail to start dpdk in a newly deployed machine.Failed progress works in proc-type=secondary mode. (DPDK version 16.04).Some logs are shown below

=========================================================================================

Primary progress:

EAL: PCI device 0000:04:00.1 on NUMA socket 0
EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
EAL:   PCI memory mapped at 0x7ffff5c04000
EAL:   PCI memory mapped at 0x7ffff6004000
PMD: eth_ixgbe_dev_init(): MAC: 2, PHY: 12, SFP+: 4
PMD: eth_ixgbe_dev_init(): port 1 vendorID=0x8086 deviceID=0x10fb
EAL: PCI device 0000:82:00.0 on NUMA socket 1
EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
EAL:   PCI memory mapped at 0x7fffec3ff000
EAL:   PCI memory mapped at 0x7ffff7ff4000
PMD: eth_ixgbe_dev_init(): MAC: 2, PHY: 12, SFP+: 3
PMD: eth_ixgbe_dev_init(): port 2 vendorID=0x8086 deviceID=0x10fb
EAL: PCI device 0000:82:00.1 on NUMA socket 1
EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
EAL:   PCI memory mapped at 0x7ffed25d9000
EAL:   PCI memory mapped at 0x7ffff7ff0000




Secondary progress logs:


PMD: ixgbe_set_rx_function(): Rx Burst Bulk Alloc Preconditions are satisfied. Rx Burst Bulk Alloc function will be used on port=0.
EAL: PCI device 0000:04:00.1 on NUMA socket 0
EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
EAL:   PCI memory mapped at 0x7ffff5c04000
EAL:   PCI memory mapped at 0x7ffff6004000
PMD: ixgbe_set_tx_function(): Using simple tx code path
PMD: ixgbe_set_rx_function(): Port[1] doesn't meet Vector Rx preconditions or RTE_IXGBE_INC_VECTOR is not enabled
PMD: ixgbe_set_rx_function(): Rx Burst Bulk Alloc Preconditions are satisfied. Rx Burst Bulk Alloc function will be used on port=1.
EAL: PCI device 0000:82:00.0 on NUMA socket 1
EAL:   probe driver: 8086:10fb rte_ixgbe_pmd
EAL:   PCI memory mapped at 0x7ffff65d8000
EAL: Cannot mmap device resource file /sys/bus/pci/devices/0000:82:00.0/resource0 to address: 0x7fffec3ff000
EAL: Error - exiting with code: 1
  Cause: Requested device 0000:82:00.0 cannot be used

==================================================================================

Relevant code is list be below:




pci_uio_map_secondary(struct rte_pci_device *dev)
{
int fd, i;
struct mapped_pci_resource *uio_res;
struct mapped_pci_res_list *uio_res_list =
RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);


TAILQ_FOREACH(uio_res, uio_res_list, next) {


/* skip this element if it doesn't match our PCI address */
if (rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
continue;


for (i = 0; i != uio_res->nb_maps; i++) {
/*
* open devname, to mmap it
*/
fd = open(uio_res->maps[i].path, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
uio_res->maps[i].path, strerror(errno));
return -1;
}


void *mapaddr = pci_map_resource(uio_res->maps[i].addr,
fd, (off_t)uio_res->maps[i].offset,
(size_t)uio_res->maps[i].size, 0);
/* fd is not needed in slave process, close it */
close(fd);
if (mapaddr != uio_res->maps[i].addr) {
RTE_LOG(ERR, EAL,
"Cannot mmap device resource file %s to address: %p\n",
uio_res->maps[i].path,
uio_res->maps[i].addr);
return -1;
}
}
return 0;
}


RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
return 1;
}







And We check the system config . ASLR is not enabled on our system.  I wondered why mapaddr != uio_res->maps[i].addr .Can anyone tell me why?







Thanks in advance.