[PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Guenter Roeck]

If a PHY does not exist, attempts to read from it should return 0xffff.
Otherwise the Linux kernel will believe that a PHY is there and select
the non-existing PHY. This in turn will result in network errors later
on since the real PHY is not selected or configured.

Since reading from or writing to a non-existing PHY is not an emulation
error, replace guest error messages with traces.

Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 hw/net/imx_fec.c    | 8 +++-----
 hw/net/trace-events | 2 ++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index f03450c028..9c7035bc94 100644
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
     uint32_t phy = reg / 32;
 
     if (phy != s->phy_num) {
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
-                      TYPE_IMX_FEC, __func__, phy);
-        return 0;
+        trace_imx_phy_read_num(phy, s->phy_num);
+        return 0xffff;
     }
 
     reg %= 32;
@@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
     uint32_t phy = reg / 32;
 
     if (phy != s->phy_num) {
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
-                      TYPE_IMX_FEC, __func__, phy);
+        trace_imx_phy_write_num(phy, s->phy_num);
         return;
     }
 
diff --git a/hw/net/trace-events b/hw/net/trace-events
index baf25ffa7e..ee77238d9e 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -413,8 +413,10 @@ i82596_set_multicast(uint16_t count) "Added %d multicast entries"
 i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION"
 
 # imx_fec.c
+imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)"
 imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]"
 imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]"
+imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)"
 imx_phy_update_link(const char *s) "%s"
 imx_phy_reset(void) ""
 imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"
-- 
2.25.1

Re: [PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Bin Meng]

On Mon, May 3, 2021 at 12:03 AM Guenter Roeck <linux@roeck-us.net> wrote:
>
> If a PHY does not exist, attempts to read from it should return 0xffff.
> Otherwise the Linux kernel will believe that a PHY is there and select
> the non-existing PHY. This in turn will result in network errors later
> on since the real PHY is not selected or configured.
>
> Since reading from or writing to a non-existing PHY is not an emulation
> error, replace guest error messages with traces.
>
> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  hw/net/imx_fec.c    | 8 +++-----
>  hw/net/trace-events | 2 ++
>  2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
> index f03450c028..9c7035bc94 100644
> --- a/hw/net/imx_fec.c
> +++ b/hw/net/imx_fec.c
> @@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
>      uint32_t phy = reg / 32;
>
>      if (phy != s->phy_num) {
> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
> -                      TYPE_IMX_FEC, __func__, phy);
> -        return 0;
> +        trace_imx_phy_read_num(phy, s->phy_num);
> +        return 0xffff;
>      }
>
>      reg %= 32;
> @@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
>      uint32_t phy = reg / 32;
>
>      if (phy != s->phy_num) {
> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
> -                      TYPE_IMX_FEC, __func__, phy);
> +        trace_imx_phy_write_num(phy, s->phy_num);
>          return;
>      }
>
> diff --git a/hw/net/trace-events b/hw/net/trace-events
> index baf25ffa7e..ee77238d9e 100644
> --- a/hw/net/trace-events
> +++ b/hw/net/trace-events
> @@ -413,8 +413,10 @@ i82596_set_multicast(uint16_t count) "Added %d multicast entries"
>  i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION"
>
>  # imx_fec.c
> +imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)"

nits: could we put this below imx_phy_read(), like you put
imx_phy_write_num after imx_phy_write?

>  imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]"
>  imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]"
> +imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)"
>  imx_phy_update_link(const char *s) "%s"
>  imx_phy_reset(void) ""
>  imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"
> --

Otherwise,
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

Re: [PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Guenter Roeck]

On 5/2/21 9:09 AM, Bin Meng wrote:
> On Mon, May 3, 2021 at 12:03 AM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> If a PHY does not exist, attempts to read from it should return 0xffff.
>> Otherwise the Linux kernel will believe that a PHY is there and select
>> the non-existing PHY. This in turn will result in network errors later
>> on since the real PHY is not selected or configured.
>>
>> Since reading from or writing to a non-existing PHY is not an emulation
>> error, replace guest error messages with traces.
>>
>> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
>> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>> ---
>>  hw/net/imx_fec.c    | 8 +++-----
>>  hw/net/trace-events | 2 ++
>>  2 files changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
>> index f03450c028..9c7035bc94 100644
>> --- a/hw/net/imx_fec.c
>> +++ b/hw/net/imx_fec.c
>> @@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
>>      uint32_t phy = reg / 32;
>>
>>      if (phy != s->phy_num) {
>> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
>> -                      TYPE_IMX_FEC, __func__, phy);
>> -        return 0;
>> +        trace_imx_phy_read_num(phy, s->phy_num);
>> +        return 0xffff;
>>      }
>>
>>      reg %= 32;
>> @@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
>>      uint32_t phy = reg / 32;
>>
>>      if (phy != s->phy_num) {
>> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
>> -                      TYPE_IMX_FEC, __func__, phy);
>> +        trace_imx_phy_write_num(phy, s->phy_num);
>>          return;
>>      }
>>
>> diff --git a/hw/net/trace-events b/hw/net/trace-events
>> index baf25ffa7e..ee77238d9e 100644
>> --- a/hw/net/trace-events
>> +++ b/hw/net/trace-events
>> @@ -413,8 +413,10 @@ i82596_set_multicast(uint16_t count) "Added %d multicast entries"
>>  i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION"
>>
>>  # imx_fec.c
>> +imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)"
> 
> nits: could we put this below imx_phy_read(), like you put
> imx_phy_write_num after imx_phy_write?
> 

Sure, makes sense. I'll wait a bit for other feedback and then resend.

>>  imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]"
>>  imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]"
>> +imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)"
>>  imx_phy_update_link(const char *s) "%s"
>>  imx_phy_reset(void) ""
>>  imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"
>> --
> 
> Otherwise,
> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
> Tested-by: Bin Meng <bmeng.cn@gmail.com>
> 

Thanks!

Guenter

Re: [PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Jason Wang]

在 2021/5/3 上午12:14, Guenter Roeck 写道:
> On 5/2/21 9:09 AM, Bin Meng wrote:
>> On Mon, May 3, 2021 at 12:03 AM Guenter Roeck <linux@roeck-us.net> wrote:
>>> If a PHY does not exist, attempts to read from it should return 0xffff.
>>> Otherwise the Linux kernel will believe that a PHY is there and select
>>> the non-existing PHY. This in turn will result in network errors later
>>> on since the real PHY is not selected or configured.
>>>
>>> Since reading from or writing to a non-existing PHY is not an emulation
>>> error, replace guest error messages with traces.
>>>
>>> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
>>> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
>>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>>> ---
>>>   hw/net/imx_fec.c    | 8 +++-----
>>>   hw/net/trace-events | 2 ++
>>>   2 files changed, 5 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
>>> index f03450c028..9c7035bc94 100644
>>> --- a/hw/net/imx_fec.c
>>> +++ b/hw/net/imx_fec.c
>>> @@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
>>>       uint32_t phy = reg / 32;
>>>
>>>       if (phy != s->phy_num) {
>>> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
>>> -                      TYPE_IMX_FEC, __func__, phy);
>>> -        return 0;
>>> +        trace_imx_phy_read_num(phy, s->phy_num);
>>> +        return 0xffff;
>>>       }
>>>
>>>       reg %= 32;
>>> @@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
>>>       uint32_t phy = reg / 32;
>>>
>>>       if (phy != s->phy_num) {
>>> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
>>> -                      TYPE_IMX_FEC, __func__, phy);
>>> +        trace_imx_phy_write_num(phy, s->phy_num);
>>>           return;
>>>       }
>>>
>>> diff --git a/hw/net/trace-events b/hw/net/trace-events
>>> index baf25ffa7e..ee77238d9e 100644
>>> --- a/hw/net/trace-events
>>> +++ b/hw/net/trace-events
>>> @@ -413,8 +413,10 @@ i82596_set_multicast(uint16_t count) "Added %d multicast entries"
>>>   i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION"
>>>
>>>   # imx_fec.c
>>> +imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)"
>> nits: could we put this below imx_phy_read(), like you put
>> imx_phy_write_num after imx_phy_write?
>>
> Sure, makes sense. I'll wait a bit for other feedback and then resend.


Ok, please send V2.

Thanks


>
>>>   imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]"
>>>   imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]"
>>> +imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)"
>>>   imx_phy_update_link(const char *s) "%s"
>>>   imx_phy_reset(void) ""
>>>   imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"
>>> --
>> Otherwise,
>> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
>> Tested-by: Bin Meng <bmeng.cn@gmail.com>
>>
> Thanks!
>
> Guenter
>

Re: [PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Guenter Roeck]

On Thu, May 06, 2021 at 10:24:52AM +0800, Jason Wang wrote:
[ ... ]

> Ok, please send V2.
> 
You should have it by now. Please let me know if it got lost.

Thanks,
Guenter

Re: [PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Philippe Mathieu-Daudé]

On 5/2/21 6:03 PM, Guenter Roeck wrote:
> If a PHY does not exist, attempts to read from it should return 0xffff.
> Otherwise the Linux kernel will believe that a PHY is there and select
> the non-existing PHY. This in turn will result in network errors later
> on since the real PHY is not selected or configured.
> 
> Since reading from or writing to a non-existing PHY is not an emulation
> error, replace guest error messages with traces.
> 
> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  hw/net/imx_fec.c    | 8 +++-----
>  hw/net/trace-events | 2 ++
>  2 files changed, 5 insertions(+), 5 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Re: [PATCH] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Jason Wang]

在 2021/5/3 上午12:03, Guenter Roeck 写道:
> If a PHY does not exist, attempts to read from it should return 0xffff.
> Otherwise the Linux kernel will believe that a PHY is there and select
> the non-existing PHY. This in turn will result in network errors later
> on since the real PHY is not selected or configured.
>
> Since reading from or writing to a non-existing PHY is not an emulation
> error, replace guest error messages with traces.
>
> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>


Applied.

Thanks


> ---
>   hw/net/imx_fec.c    | 8 +++-----
>   hw/net/trace-events | 2 ++
>   2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
> index f03450c028..9c7035bc94 100644
> --- a/hw/net/imx_fec.c
> +++ b/hw/net/imx_fec.c
> @@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
>       uint32_t phy = reg / 32;
>   
>       if (phy != s->phy_num) {
> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
> -                      TYPE_IMX_FEC, __func__, phy);
> -        return 0;
> +        trace_imx_phy_read_num(phy, s->phy_num);
> +        return 0xffff;
>       }
>   
>       reg %= 32;
> @@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
>       uint32_t phy = reg / 32;
>   
>       if (phy != s->phy_num) {
> -        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
> -                      TYPE_IMX_FEC, __func__, phy);
> +        trace_imx_phy_write_num(phy, s->phy_num);
>           return;
>       }
>   
> diff --git a/hw/net/trace-events b/hw/net/trace-events
> index baf25ffa7e..ee77238d9e 100644
> --- a/hw/net/trace-events
> +++ b/hw/net/trace-events
> @@ -413,8 +413,10 @@ i82596_set_multicast(uint16_t count) "Added %d multicast entries"
>   i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION"
>   
>   # imx_fec.c
> +imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)"
>   imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]"
>   imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]"
> +imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)"
>   imx_phy_update_link(const char *s) "%s"
>   imx_phy_reset(void) ""
>   imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"