Hi John, Did you try to disable DMA support to see if the issue disappear?
I think other MCUs are using DMA for Ethernet too and this issue didn't happen. So I think disabling DMA could be a valid test to find out the root causes. BR, Alan On 3/4/21, John Rippetoe <jrippe...@roboticresearch.com> wrote: > Hello All, > > I've been playing around with networking on the STM32H7 and am seeing > hardfaults that appear to be related to NET_ETH_PKTSIZE. From the log > below, the driver would appear to be dropping packets that are too large > to fit into the default packet size of 590. By increasing the packet > size to the max (1518), the problem seems to disappear, but I am a > little confused why the driver is able to catch the fact that the > received packet was too large and drop it appropriately, but then crash. > After poking around the ethernet driver, I think I understand the issue > to be that because the MAC DMA does not know that the buffer it is > writing into has a size limit, it is overflowing the buffer and writing > into adjacent memory. Am I understanding this correctly? > > My main concern here is that increasing NET_ETH_PKTSIZE to the limit > will only hide the issue for a time instead of solving it. A quick > google search does show that the maximum ethernet frame size is 1518 > bytes though, so I am working under the assumption that maxing it out in > my config will account for all possible frame sizes and eliminate this > issue. I have no experience with low level networking protocols and > standards, so I thought it would be prudent to seek out additional help > to make sure I am on the right track. > > Thanks in advance. > > - John > > stm32_receive: WARNING: DROPPED Too big: 684 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 1332 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 1264 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 684 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 1364 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 1264 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 1436 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > stm32_receive: WARNING: DROPPED Too big: 1300 > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > ipv4_input: WARNING: Not destined for us; not forwardable... Dropping! > up_hardfault: PANIC!!! Hard fault: 40000000 > up_assert: Assertion failed at file:armv7-m/up_hardfault.c line: 148 > task: lpwork > up_registerdump: R0: 24012080 2401206e 0000024e 00000000 24012000 > 40029160 24011fc0 00008040 > up_registerdump: R8: 40029134 24011f00 24011fe0 240120b8 00000001 > 38002f88 080a26a7 080a2538 > up_registerdump: xPSR: 81000000 BASEPRI: 000000f0 CONTROL: 00000000 > up_registerdump: EXC_RETURN: ffffffe9 > up_dumpstate: sp: 24010bb0 > up_dumpstate: IRQ stack: > up_dumpstate: base: 24010c00 > up_dumpstate: size: 00000200 > up_dumpstate: used: 00000140 > up_stackdump: 24010ba0: 24010bb0 2400e830 0000064c 080a0fed 000000f0 > 00000000 240120b8 00000001 > up_stackdump: 24010bc0: 38002f88 080a26a7 080a2538 0816625a 00000000 > 080a129f 080a1271 080f754f > up_stackdump: 24010be0: 000000f0 080a2935 000000f0 38002eb4 40029160 > 24011fc0 00008040 080a1b8f > up_dumpstate: sp: 38002f88 > up_dumpstate: User stack: > up_dumpstate: base: 38003008 > up_dumpstate: size: 0000064c > up_dumpstate: used: 000003e0 > up_stackdump: 38002f80: 00000010 080a269b 24012050 24012000 00000000 > 24012010 2400b430 00000000 > up_stackdump: 38002fa0: 000000f0 00000080 00000000 00000000 00005ec8 > 0809d2e7 ffffffff ffffffff > up_stackdump: 38002fc0: 00005ec8 00000001 00000010 00020000 39276cac > 2400b430 00000000 00000000 > up_stackdump: 38002fe0: 00000000 00000000 00000000 00000000 00000000 > 0809c501 0809c4f1 0809bed5 > up_stackdump: 38003000: 00000000 00000000 deadbeef 38003014 00000000 > 6f77706c de006b72 7b93d153 > up_taskdump: Idle Task: PID=0 Stack Used=0 of 0 > up_taskdump: hpwork: PID=1 Stack Used=352 of 2028 > up_taskdump: lpwork: PID=2 Stack Used=992 of 1612 > up_taskdump: init: PID=3 Stack Used=1544 of 2980 > > > CONFIDENTIALITY NOTICE: This communication may contain private, confidential > and privileged material for the sole use of the intended recipient. 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