Date:   Tue, 15 Feb 2022 08:36:54 -0600
From:   Jeremy Linton <jeremy.linton@....com>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [BUG/PATCH v3] net: mvpp2: always set port pcs ops

Hi,

On 2/15/22 02:38, Marcin Wojtas wrote:
> Hi Jeremy,
> 
> 
> wt., 15 lut 2022 o 00:18 Jeremy Linton <jeremy.linton@....com> napisał(a):
>>
>> Booting a MACCHIATObin with 5.17, the system OOPs with
>> a null pointer deref when the network is started. This
>> is caused by the pcs->ops structure being null in
>> mcpp2_acpi_start() when it tries to call pcs_config().
>>
>> Hoisting the code which sets pcs_gmac.ops and pcs_xlg.ops,
>> assuring they are always set, fixes the problem.
>>
>> The OOPs looks like:
>> [   18.687760] Unable to handle kernel access to user memory outside uaccess routines at virtual address 0000000000000010
>> [   18.698561] Mem abort info:
>> [   18.698564]   ESR = 0x96000004
>> [   18.698567]   EC = 0x25: DABT (current EL), IL = 32 bits
>> [   18.709821]   SET = 0, FnV = 0
>> [   18.714292]   EA = 0, S1PTW = 0
>> [   18.718833]   FSC = 0x04: level 0 translation fault
>> [   18.725126] Data abort info:
>> [   18.729408]   ISV = 0, ISS = 0x00000004
>> [   18.734655]   CM = 0, WnR = 0
>> [   18.738933] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000111bbf000
>> [   18.745409] [0000000000000010] pgd=0000000000000000, p4d=0000000000000000
>> [   18.752235] Internal error: Oops: 96000004 [#1] SMP
>> [   18.757134] Modules linked in: rfkill ip_set nf_tables nfnetlink qrtr sunrpc vfat fat omap_rng fuse zram xfs crct10dif_ce mvpp2 ghash_ce sbsa_gwdt phylink xhci_plat_hcd ahci_plam
>> [   18.773481] CPU: 0 PID: 681 Comm: NetworkManager Not tainted 5.17.0-0.rc3.89.fc36.aarch64 #1
>> [   18.781954] Hardware name: Marvell                         Armada 7k/8k Family Board      /Armada 7k/8k Family Board      , BIOS EDK II Jun  4 2019
>> [   18.795222] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>> [   18.802213] pc : mvpp2_start_dev+0x2b0/0x300 [mvpp2]
>> [   18.807208] lr : mvpp2_start_dev+0x298/0x300 [mvpp2]
>> [   18.812197] sp : ffff80000b4732c0
>> [   18.815522] x29: ffff80000b4732c0 x28: 0000000000000000 x27: ffffccab38ae57f8
>> [   18.822689] x26: ffff6eeb03065a10 x25: ffff80000b473a30 x24: ffff80000b4735b8
>> [   18.829855] x23: 0000000000000000 x22: 00000000000001e0 x21: ffff6eeb07b6ab68
>> [   18.837021] x20: ffff6eeb07b6ab30 x19: ffff6eeb07b6a9c0 x18: 0000000000000014
>> [   18.844187] x17: 00000000f6232bfe x16: ffffccab899b1dc0 x15: 000000006a30f9fa
>> [   18.851353] x14: 000000003b77bd50 x13: 000006dc896f0e8e x12: 001bbbfccfd0d3a2
>> [   18.858519] x11: 0000000000001528 x10: 0000000000001548 x9 : ffffccab38ad0fb0
>> [   18.865685] x8 : ffff80000b473330 x7 : 0000000000000000 x6 : 0000000000000000
>> [   18.872851] x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80000b4732f8
>> [   18.880017] x2 : 000000000000001a x1 : 0000000000000002 x0 : ffff6eeb07b6ab68
>> [   18.887183] Call trace:
>> [   18.889637]  mvpp2_start_dev+0x2b0/0x300 [mvpp2]
>> [   18.894279]  mvpp2_open+0x134/0x2b4 [mvpp2]
>> [   18.898483]  __dev_open+0x128/0x1e4
>> [   18.901988]  __dev_change_flags+0x17c/0x1d0
>> [   18.906187]  dev_change_flags+0x30/0x70
>> [   18.910038]  do_setlink+0x278/0xa7c
>> [   18.913540]  __rtnl_newlink+0x44c/0x7d0
>> [   18.917391]  rtnl_newlink+0x5c/0x8c
>> [   18.920892]  rtnetlink_rcv_msg+0x254/0x314
>> [   18.925006]  netlink_rcv_skb+0x48/0x10c
>> [   18.928858]  rtnetlink_rcv+0x24/0x30
>> [   18.932449]  netlink_unicast+0x290/0x2f4
>> [   18.936386]  netlink_sendmsg+0x1d0/0x41c
>> [   18.940323]  sock_sendmsg+0x60/0x70
>> [   18.943825]  ____sys_sendmsg+0x248/0x260
>> [   18.947762]  ___sys_sendmsg+0x74/0xa0
>> [   18.951438]  __sys_sendmsg+0x64/0xcc
>> [   18.955027]  __arm64_sys_sendmsg+0x30/0x40
>> [   18.959140]  invoke_syscall+0x50/0x120
>> [   18.962906]  el0_svc_common.constprop.0+0x4c/0xf4
>> [   18.967629]  do_el0_svc+0x30/0x9c
>> [   18.970958]  el0_svc+0x28/0xb0
>> [   18.974025]  el0t_64_sync_handler+0x10c/0x140
>> [   18.978400]  el0t_64_sync+0x1a4/0x1a8
>> [   18.982078] Code: 52800004 b9416262 aa1503e0 52800041 (f94008a5)
>> [   18.988196] ---[ end trace 0000000000000000 ]---
>>
>> Fixes: cff056322372 ("net: mvpp2: use .mac_select_pcs() interface")
>> Suggested-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
>> Signed-off-by: Jeremy Linton <jeremy.linton@....com>
>> ---
>> v1->v2: Apply Russell's fix
>> v2->v3: Fix Russell's name
>>
>>   drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
>> index 7cdbf8b8bbf6..1a835b48791b 100644
>> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
>> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
>> @@ -6870,6 +6870,9 @@ static int mvpp2_port_probe(struct platform_device *pdev,
>>          dev->max_mtu = MVPP2_BM_JUMBO_PKT_SIZE;
>>          dev->dev.of_node = port_node;
>>
>> +       port->pcs_gmac.ops = &mvpp2_phylink_gmac_pcs_ops;
>> +       port->pcs_xlg.ops = &mvpp2_phylink_xlg_pcs_ops;
>> +
>>          if (!mvpp2_use_acpi_compat_mode(port_fwnode)) {
>>                  port->phylink_config.dev = &dev->dev;
>>                  port->phylink_config.type = PHYLINK_NETDEV;
>> @@ -6940,9 +6943,6 @@ static int mvpp2_port_probe(struct platform_device *pdev,
>>                                    port->phylink_config.supported_interfaces);
>>                  }
>>
>> -               port->pcs_gmac.ops = &mvpp2_phylink_gmac_pcs_ops;
>> -               port->pcs_xlg.ops = &mvpp2_phylink_xlg_pcs_ops;
>> -
>>                  phylink = phylink_create(&port->phylink_config, port_fwnode,
>>                                           phy_mode, &mvpp2_phylink_ops);
>>                  if (IS_ERR(phylink)) {
>> --
>> 2.34.1
>>
> 
> I'd like to test the patch - what EDK2 version are you using?

I don't have access to the machine at the moment (maybe in a couple days 
again) but it was running a build from late 2019 IIRC. So, definitely 
not a bleeding edge version for sure.

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