On 10/6/25 14:55, David Marchand wrote:
On Mon, 6 Oct 2025 at 14:45, Thierry Herbelot
<[email protected]> wrote:
The e1000 PMD stopped working under Ubuntu-24.04 (using gcc-13) when
compiled with -O3 (default level for all DPDK code). There is a crash
when starting testpmd:
(gdb) bt
#0 rte_read32_relaxed (addr=0x1100800e00) at
../sources/lib/eal/include/generic/rte_io.h:290
#1 rte_read32 (addr=0x1100800e00) at
../sources/lib/eal/include/generic/rte_io.h:345
#2 e1000_read_addr (addr=0x1100800e00) at
../sources/drivers/net/intel/e1000/base/e1000_osdep.h:106
#3 e1000_id_led_init_generic (hw=0x1586788c0) at
../sources/drivers/net/intel/e1000/base/e1000_mac.c:1844
#4 0x000062aaf653c85f in e1000_init_hw_82540 (hw=0x1586788c0)
at ../sources/drivers/net/intel/e1000/base/e1000_82540.c:308
#5 0x000062aaf6db8227 in em_hardware_init (hw=hw@entry=0x1586788c0)
at ../sources/drivers/net/intel/e1000/em_ethdev.c:920
#6 0x000062aaf65340ff in em_hw_init (hw=0x1586788c0) at
../sources/drivers/net/intel/e1000/em_ethdev.c:445
#7 eth_em_dev_init (eth_dev=eth_dev@entry=0x62aaff346000 <rte_eth_devices>)
at ../sources/drivers/net/intel/e1000/em_ethdev.c:314
#8 0x000062aaf6db8b71 in rte_eth_dev_pci_generic_probe
(private_data_size=11240,
dev_init=0x62aaf6db8310 <eth_em_dev_init>, pci_dev=0x62ab2853dd90) at
../sources/lib/ethdev/ethdev_pci.h:150
#9 eth_em_pci_probe (pci_drv=<optimized out>, pci_dev=0x62ab2853dd90)
at ../sources/drivers/net/intel/e1000/em_ethdev.c:365
#10 0x000062aaf646adf5 in rte_pci_probe_one_driver (dr=dr@entry=0x62aaf82d8020
<rte_em_pmd>,
dev=dev@entry=0x62ab2853dd90) at
../sources/drivers/bus/pci/pci_common.c:299
#11 0x000062aaf6a15f7d in pci_probe_all_drivers (dev=0x62ab2853dd90) at
../sources/drivers/bus/pci/pci_common.c:383
#12 pci_probe () at ../sources/drivers/bus/pci/pci_common.c:410
#13 0x000062aaf7a485f3 in rte_bus_probe () at
../sources/lib/eal/common/eal_common_bus.c:84
#14 0x000062aaf670585d in rte_eal_init (argc=argc@entry=146,
argv=argv@entry=0x7fffca468898)
at ../sources/lib/eal/linux/eal.c:1253
The crash is linked to the use of gcc-13: uner Ubuntu-24.04 testpmd
compiled with gcc-11 from the same DPDK tree works as expected.
The perfect solution would be for someone to investigate why the
PMD crashes. However, this depends on Maintainer availability.
A less-perfect solution is to reduce the optimization level
(like another proposal for net/qede: see Link).
Note: if more regressions are seen in less-frequently used PMDs,
maybe we should switch the default optimization level to -O1,
(tree-wide) and only rise the optimization level for actively
maintained PMDs, which are proven to work as expected with
higher optimization levels.
Link:
http://patches.dpdk.org/project/dpdk/patch/[email protected]/
Signed-off-by: Thierry Herbelot <[email protected]>
NAK.
Please RCA this rather than hiding such an issue.
Hello David,
As said in the commit log, this is clearly a Maintainer issue, who will
have the hardware documentation. The PMD is broken, and this was not
seen until a new gcc is used.
We can not expect a random developer to sprinkle memory barriers in the
PMD until testpmd seems to be working.
Best regards
Thierry
--
Thierry Herbelot
