linux-kernel - Re: [net-next] net: mvpp2: Add TX flow control support for jumbo frames

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Message-ID: <CAPv3WKc4LKtZoyW3ixXfhvvYeOTkNVfTSdGWWWuKZS2hmOStDQ@mail.gmail.com>
Date:   Mon, 3 Oct 2022 10:30:59 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     matoro <matoro_mailinglist_kernel@...oro.tk>
Cc:     stefanc@...vell.com, netdev@...r.kernel.org,
        thomas.petazzoni@...tlin.com, davem@...emloft.net,
        nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org,
        linux@...linux.org.uk, andrew@...n.ch, rmk+kernel@...linux.org.uk,
        atenart@...nel.org, jon@...id-run.com
Subject: Re: [net-next] net: mvpp2: Add TX flow control support for jumbo frames

Hi,

niedz., 2 paź 2022 o 21:25 matoro
<matoro_mailinglist_kernel@...oro.tk> napisał(a):
>
> Hi all, I know this is kind of an old change but I have got an issue
> with this driver that might be related.  Whenever I change the MTU of
> any interfacing using mvpp2, it immediately results in the following
> crash.  Is this change related?  Is this a known issue with this driver?
>
> [ 1725.925804] mvpp2 f2000000.ethernet eth0: mtu 9000 too high,
> switching to shared buffers
> [ 1725.9258[ 1725.935611] mvpp2 f2000000.ethernet eth0: Link is Down
> 04] mvpp2 f2000000.ethernet eth0: mtu 9000 too high, switching to shared
> buffers
> [ 17[ 1725.950079] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000000
> 25.935611]  Mem abort info:
> [33mmvpp2 f20000[ 1725.963804]   ESR = 0x0000000096000004
> 00.ethernet eth0[ 1725.968960]   EC = 0x25: DABT (current EL), IL = 32
> bits
> : Link is Do[ 1725.975685]   SET = 0, FnV = 0
> wn
> [ 1725.980143]   EA = 0, S1PTW = 0
> [ 1725.983643]   FSC = 0x04: level 0 translation fault
> [ 1725.988539] Data abort info:
> [ 1725.991430]   ISV = 0, ISS = 0x00000004
> [ 1725.995279]   CM = 0, WnR = 0
> [ 1725.998256] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000104b83000
> [ 1726.004724] [0000000000000000] pgd=0000000000000000,
> p4d=0000000000000000
> [ 1726.011543] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> [ 1726.017137] Modules linked in: sfp mdio_i2c marvell mcp3021 mvmdio
> at24 mvpp2 armada_thermal phylink sbsa_gwdt cfg80211 rfkill fuse
> [ 1726.029032] CPU: 2 PID: 16253 Comm: ip Not tainted
> 5.19.8-1-aarch64-ARCH #1
> [ 1726.036024] Hardware name: SolidRun CN9130 based SOM Clearfog Base
> (DT)
> [ 1726.042665] pstate: 800000c5 (Nzcv daIF -PAN -UAO -TCO -DIT -SSBS
> BTYPE=--)
> [ 1726.049656] pc : mvpp2_cm3_read.isra.0+0x8/0x2c [mvpp2]
> [ 1726.054915] lr : mvpp2_bm_pool_update_fc+0x40/0x154 [mvpp2]
> [ 1726.060515] sp : ffff80000b17b580
> [ 1726.063842] x29: ffff80000b17b580 x28: 0000000000000000 x27:
> 0000000000000000
> [ 1726.071010] x26: ffff8000013ceb60 x25: 0000000000000008 x24:
> ffff0001054b5980
> [ 1726.078177] x23: ffff0001021e2480 x22: 0000000000000038 x21:
> 0000000000000000
> [ 1726.085346] x20: ffff0001049dac80 x19: ffff0001054b4980 x18:
> 0000000000000000
> [ 1726.092513] x17: 0000000000000000 x16: 0000000000000000 x15:
> 0000000000000000
> [ 1726.099680] x14: 0000000000000109 x13: 0000000000000109 x12:
> 0000000000000000
> [ 1726.106847] x11: 0000000000000040 x10: ffff80000a3471b8 x9 :
> ffff80000a3471b0
> [ 1726.114015] x8 : ffff000100401b88 x7 : 0000000000000000 x6 :
> 0000000000000000
> [ 1726.121182] x5 : ffff80000b17b4e0 x4 : 0000000000000000 x3 :
> 0000000000000000
> [ 1726.128348] x2 : ffff0001021e2480 x1 : 0000000000000000 x0 :
> 0000000000000000
> [ 1726.135514] Call trace:
> [ 1726.137968]  mvpp2_cm3_read.isra.0+0x8/0x2c [mvpp2]
> [ 1726.142871]  mvpp2_bm_pool_update_priv_fc+0xc0/0x100 [mvpp2]
> [ 1726.148558]  mvpp2_bm_switch_buffers.isra.0+0x1c0/0x1e0 [mvpp2]
> [ 1726.154506]  mvpp2_change_mtu+0x184/0x264 [mvpp2]
> [ 1726.159233]  dev_set_mtu_ext+0xdc/0x1b4
> [ 1726.163087]  do_setlink+0x1d4/0xa90
> [ 1726.166593]  __rtnl_newlink+0x4a8/0x4f0
> [ 1726.170443]  rtnl_newlink+0x4c/0x80
> [ 1726.173944]  rtnetlink_rcv_msg+0x12c/0x37c
> [ 1726.178058]  netlink_rcv_skb+0x5c/0x130
> [ 1726.181910]  rtnetlink_rcv+0x18/0x2c
> [ 1726.185500]  netlink_unicast+0x2c4/0x31c
> [ 1726.189438]  netlink_sendmsg+0x1bc/0x410
> [ 1726.193377]  sock_sendmsg+0x54/0x60
> [ 1726.196879]  ____sys_sendmsg+0x26c/0x290
> [ 1726.200817]  ___sys_sendmsg+0x7c/0xc0
> [ 1726.204494]  __sys_sendmsg+0x68/0xd0
> [ 1726.208083]  __arm64_sys_sendmsg+0x28/0x34
> [ 1726.212196]  invoke_syscall+0x48/0x114
> [ 1726.215962]  el0_svc_common.constprop.0+0x44/0xec
> [ 1726.220686]  do_el0_svc+0x28/0x34
> [ 1726.224014]  el0_svc+0x2c/0x84
> [ 1726.227082]  el0t_64_sync_handler+0x11c/0x150
> [ 1726.231455]  el0t_64_sync+0x18c/0x190
> [ 1726.235134] Code: d65f03c0 d65f03c0 d503233f 8b214000 (b9400000)
> [ 1726.241253] ---[ end trace 0000000000000000 ]---
> [ 1726.245888] note: ip[16253] exited with preempt_count 1
>

Thank you for the report. I will check in my setup. Please provide me
with the log from the power on until OS prompt (it should include the
early firmware and the full dmesg).

Best regards,
Marcin