[net-next,PATCH] net: dsa: microchip: Do not count RX/TX Bytes and discards on KSZ87xx

[net-next,PATCH] net: dsa: microchip: Do not count RX/TX Bytes and discards on KSZ87xx

[Marek Vasut]

Unlike KSZ94xx, the KSZ87xx is missing the last four MIB counters at
address 0x20..0x23, namely rx_total, tx_total, rx_discards, tx_discards.

Using values from rx_total / tx_total in rx_bytes / tx_bytes calculation
results in an underflow, because rx_total / tx_total returns values 0,
and the "raw->rx_total - stats->rx_packets * ETH_FCS_LEN;" calculation
undeflows if rx_packets / tx_packets is > 0 .

Stop using the missing MIB counters on KSZ87xx .

Fixes: c6101dd7ffb8 ("net: dsa: ksz9477: move get_stats64 to ksz_common.c")
Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
---
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Arun Ramadoss <arun.ramadoss@microchip.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Tristram Ha <tristram.ha@microchip.com>
Cc: UNGLinuxDriver@microchip.com
Cc: Vladimir Oltean <olteanv@gmail.com>
Cc: Woojung Huh <woojung.huh@microchip.com>
Cc: netdev@vger.kernel.org
---
 drivers/net/dsa/microchip/ksz_common.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 7292bfe2f7cac..9c01526779a6d 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2239,20 +2239,23 @@ void ksz_r_mib_stats64(struct ksz_device *dev, int port)
 	/* HW counters are counting bytes + FCS which is not acceptable
 	 * for rtnl_link_stats64 interface
 	 */
-	stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
-	stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
-
+	if (!ksz_is_ksz87xx(dev)) {
+		stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
+		stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
+	}
 	stats->rx_length_errors = raw->rx_undersize + raw->rx_fragments +
 		raw->rx_oversize;
 
 	stats->rx_crc_errors = raw->rx_crc_err;
 	stats->rx_frame_errors = raw->rx_align_err;
-	stats->rx_dropped = raw->rx_discards;
+	if (!ksz_is_ksz87xx(dev))
+		stats->rx_dropped = raw->rx_discards;
 	stats->rx_errors = stats->rx_length_errors + stats->rx_crc_errors +
 		stats->rx_frame_errors  + stats->rx_dropped;
 
 	stats->tx_window_errors = raw->tx_late_col;
-	stats->tx_fifo_errors = raw->tx_discards;
+	if (!ksz_is_ksz87xx(dev))
+		stats->tx_fifo_errors = raw->tx_discards;
 	stats->tx_aborted_errors = raw->tx_exc_col;
 	stats->tx_errors = stats->tx_window_errors + stats->tx_fifo_errors +
 		stats->tx_aborted_errors;
-- 
2.47.2

RE: [net-next,PATCH] net: dsa: microchip: Do not count RX/TX Bytes and discards on KSZ87xx

[Tristram.Ha]

> Unlike KSZ94xx, the KSZ87xx is missing the last four MIB counters at
> address 0x20..0x23, namely rx_total, tx_total, rx_discards, tx_discards.
> 
> Using values from rx_total / tx_total in rx_bytes / tx_bytes calculation
> results in an underflow, because rx_total / tx_total returns values 0,
> and the "raw->rx_total - stats->rx_packets * ETH_FCS_LEN;" calculation
> undeflows if rx_packets / tx_packets is > 0 .
> 
> Stop using the missing MIB counters on KSZ87xx .
> 
> Fixes: c6101dd7ffb8 ("net: dsa: ksz9477: move get_stats64 to ksz_common.c")
> Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
> ---
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Arun Ramadoss <arun.ramadoss@microchip.com>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: Tristram Ha <tristram.ha@microchip.com>
> Cc: UNGLinuxDriver@microchip.com
> Cc: Vladimir Oltean <olteanv@gmail.com>
> Cc: Woojung Huh <woojung.huh@microchip.com>
> Cc: netdev@vger.kernel.org
> ---
>  drivers/net/dsa/microchip/ksz_common.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c
> b/drivers/net/dsa/microchip/ksz_common.c
> index 7292bfe2f7cac..9c01526779a6d 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -2239,20 +2239,23 @@ void ksz_r_mib_stats64(struct ksz_device *dev, int port)
>         /* HW counters are counting bytes + FCS which is not acceptable
>          * for rtnl_link_stats64 interface
>          */
> -       stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
> -       stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
> -
> +       if (!ksz_is_ksz87xx(dev)) {
> +               stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
> +               stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
> +       }
>         stats->rx_length_errors = raw->rx_undersize + raw->rx_fragments +
>                 raw->rx_oversize;
> 
>         stats->rx_crc_errors = raw->rx_crc_err;
>         stats->rx_frame_errors = raw->rx_align_err;
> -       stats->rx_dropped = raw->rx_discards;
> +       if (!ksz_is_ksz87xx(dev))
> +               stats->rx_dropped = raw->rx_discards;
>         stats->rx_errors = stats->rx_length_errors + stats->rx_crc_errors +
>                 stats->rx_frame_errors  + stats->rx_dropped;
> 
>         stats->tx_window_errors = raw->tx_late_col;
> -       stats->tx_fifo_errors = raw->tx_discards;
> +       if (!ksz_is_ksz87xx(dev))
> +               stats->tx_fifo_errors = raw->tx_discards;
>         stats->tx_aborted_errors = raw->tx_exc_col;
>         stats->tx_errors = stats->tx_window_errors + stats->tx_fifo_errors +
>                 stats->tx_aborted_errors;

I am not sure why you have that problem.  In my KSZ8795 board running in
kernel 6.16 those counters are working.  Using "ethtool -S lan3" or
"ethtool -S eth0" shows rx_total and tx_total.  The "rx_discards" and
"tx_discards" are hard to get.  In KSZ8863 the "tx_discards" counter is
incremented when the port does not have link and a packet is sent to that
port.  In newer switches that behavior was changed.  Occasionally you may
get 1 or 2 at the beginning when the tail tagging function is not enabled
yet but the MAC sends out packets.  The "rx_discards" count typically
seldom happens, but somehow in my first bootup there are many from my
KSZ8795 board.

Actually that many rx_discards may be a problem I need to find out.

I think you are confused about how those MIB counters are read from
KSZ8795.  They are not using the code in ksz9477.c but in ksz8.c.

Re: [net-next,PATCH] net: dsa: microchip: Do not count RX/TX Bytes and discards on KSZ87xx

[Marek Vasut]

On 8/11/25 10:47 PM, Tristram.Ha@microchip.com wrote:
>> Unlike KSZ94xx, the KSZ87xx is missing the last four MIB counters at
>> address 0x20..0x23, namely rx_total, tx_total, rx_discards, tx_discards.
>>
>> Using values from rx_total / tx_total in rx_bytes / tx_bytes calculation
>> results in an underflow, because rx_total / tx_total returns values 0,
>> and the "raw->rx_total - stats->rx_packets * ETH_FCS_LEN;" calculation
>> undeflows if rx_packets / tx_packets is > 0 .
>>
>> Stop using the missing MIB counters on KSZ87xx .
>>
>> Fixes: c6101dd7ffb8 ("net: dsa: ksz9477: move get_stats64 to ksz_common.c")
>> Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
>> ---
>> Cc: Andrew Lunn <andrew@lunn.ch>
>> Cc: Arun Ramadoss <arun.ramadoss@microchip.com>
>> Cc: Eric Dumazet <edumazet@google.com>
>> Cc: Jakub Kicinski <kuba@kernel.org>
>> Cc: Paolo Abeni <pabeni@redhat.com>
>> Cc: Tristram Ha <tristram.ha@microchip.com>
>> Cc: UNGLinuxDriver@microchip.com
>> Cc: Vladimir Oltean <olteanv@gmail.com>
>> Cc: Woojung Huh <woojung.huh@microchip.com>
>> Cc: netdev@vger.kernel.org
>> ---
>>   drivers/net/dsa/microchip/ksz_common.c | 13 ++++++++-----
>>   1 file changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/net/dsa/microchip/ksz_common.c
>> b/drivers/net/dsa/microchip/ksz_common.c
>> index 7292bfe2f7cac..9c01526779a6d 100644
>> --- a/drivers/net/dsa/microchip/ksz_common.c
>> +++ b/drivers/net/dsa/microchip/ksz_common.c
>> @@ -2239,20 +2239,23 @@ void ksz_r_mib_stats64(struct ksz_device *dev, int port)
>>          /* HW counters are counting bytes + FCS which is not acceptable
>>           * for rtnl_link_stats64 interface
>>           */
>> -       stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
>> -       stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
>> -
>> +       if (!ksz_is_ksz87xx(dev)) {
>> +               stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
>> +               stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
>> +       }
>>          stats->rx_length_errors = raw->rx_undersize + raw->rx_fragments +
>>                  raw->rx_oversize;
>>
>>          stats->rx_crc_errors = raw->rx_crc_err;
>>          stats->rx_frame_errors = raw->rx_align_err;
>> -       stats->rx_dropped = raw->rx_discards;
>> +       if (!ksz_is_ksz87xx(dev))
>> +               stats->rx_dropped = raw->rx_discards;
>>          stats->rx_errors = stats->rx_length_errors + stats->rx_crc_errors +
>>                  stats->rx_frame_errors  + stats->rx_dropped;
>>
>>          stats->tx_window_errors = raw->tx_late_col;
>> -       stats->tx_fifo_errors = raw->tx_discards;
>> +       if (!ksz_is_ksz87xx(dev))
>> +               stats->tx_fifo_errors = raw->tx_discards;
>>          stats->tx_aborted_errors = raw->tx_exc_col;
>>          stats->tx_errors = stats->tx_window_errors + stats->tx_fifo_errors +
>>                  stats->tx_aborted_errors;
> 
> I am not sure why you have that problem.  In my KSZ8795 board running in
> kernel 6.16 those counters are working.  Using "ethtool -S lan3" or
> "ethtool -S eth0" shows rx_total and tx_total.  The "rx_discards" and
> "tx_discards" are hard to get.  In KSZ8863 the "tx_discards" counter is
> incremented when the port does not have link and a packet is sent to that
> port.  In newer switches that behavior was changed.  Occasionally you may
> get 1 or 2 at the beginning when the tail tagging function is not enabled
> yet but the MAC sends out packets.  The "rx_discards" count typically
> seldom happens, but somehow in my first bootup there are many from my
> KSZ8795 board.
> 
> Actually that many rx_discards may be a problem I need to find out.
> 
> I think you are confused about how those MIB counters are read from
> KSZ8795.  They are not using the code in ksz9477.c but in ksz8.c.

See [1] TABLE 4-26: PORT MIB COUNTER INDIRECT MEMORY OFFSETS (CONTINUED) 
, page 108 at the very end . Notice the table ends at 0x1F 
TxMultipleCollision .

See [2] TABLE 5-6: MIB COUNTERS (CONTINUED) , page 219 at the end of the 
table . Notice the table contains four extra entries , 0x80 RxByteCnt , 
0x81 TxByteCnt , 0x82 RxDropPackets , 0x83 TXDropPackets .

These entries are present on KSZ9477 and missing on KSZ8795 .

This is what this patch attempts to address.

[1] 
https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/KSZ8795CLX-Data-Sheet-DS00002112.pdf
[2] 
https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/KSZ9477S-Data-Sheet-DS00002392C.pdf

-- 
Best regards,
Marek Vasut

RE: [net-next,PATCH] net: dsa: microchip: Do not count RX/TX Bytes and discards on KSZ87xx

[Tristram.Ha]

> On 8/11/25 10:47 PM, Tristram.Ha@microchip.com wrote:
> >> Unlike KSZ94xx, the KSZ87xx is missing the last four MIB counters at
> >> address 0x20..0x23, namely rx_total, tx_total, rx_discards, tx_discards.
> >>
> >> Using values from rx_total / tx_total in rx_bytes / tx_bytes calculation
> >> results in an underflow, because rx_total / tx_total returns values 0,
> >> and the "raw->rx_total - stats->rx_packets * ETH_FCS_LEN;" calculation
> >> undeflows if rx_packets / tx_packets is > 0 .
> >>
> >> Stop using the missing MIB counters on KSZ87xx .
> >>
> >> Fixes: c6101dd7ffb8 ("net: dsa: ksz9477: move get_stats64 to ksz_common.c")
> >> Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>
> >> ---
> >> Cc: Andrew Lunn <andrew@lunn.ch>
> >> Cc: Arun Ramadoss <arun.ramadoss@microchip.com>
> >> Cc: Eric Dumazet <edumazet@google.com>
> >> Cc: Jakub Kicinski <kuba@kernel.org>
> >> Cc: Paolo Abeni <pabeni@redhat.com>
> >> Cc: Tristram Ha <tristram.ha@microchip.com>
> >> Cc: UNGLinuxDriver@microchip.com
> >> Cc: Vladimir Oltean <olteanv@gmail.com>
> >> Cc: Woojung Huh <woojung.huh@microchip.com>
> >> Cc: netdev@vger.kernel.org
> >> ---
> >>   drivers/net/dsa/microchip/ksz_common.c | 13 ++++++++-----
> >>   1 file changed, 8 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/drivers/net/dsa/microchip/ksz_common.c
> >> b/drivers/net/dsa/microchip/ksz_common.c
> >> index 7292bfe2f7cac..9c01526779a6d 100644
> >> --- a/drivers/net/dsa/microchip/ksz_common.c
> >> +++ b/drivers/net/dsa/microchip/ksz_common.c
> >> @@ -2239,20 +2239,23 @@ void ksz_r_mib_stats64(struct ksz_device *dev, int
> port)
> >>          /* HW counters are counting bytes + FCS which is not acceptable
> >>           * for rtnl_link_stats64 interface
> >>           */
> >> -       stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
> >> -       stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
> >> -
> >> +       if (!ksz_is_ksz87xx(dev)) {
> >> +               stats->rx_bytes = raw->rx_total - stats->rx_packets * ETH_FCS_LEN;
> >> +               stats->tx_bytes = raw->tx_total - stats->tx_packets * ETH_FCS_LEN;
> >> +       }
> >>          stats->rx_length_errors = raw->rx_undersize + raw->rx_fragments +
> >>                  raw->rx_oversize;
> >>
> >>          stats->rx_crc_errors = raw->rx_crc_err;
> >>          stats->rx_frame_errors = raw->rx_align_err;
> >> -       stats->rx_dropped = raw->rx_discards;
> >> +       if (!ksz_is_ksz87xx(dev))
> >> +               stats->rx_dropped = raw->rx_discards;
> >>          stats->rx_errors = stats->rx_length_errors + stats->rx_crc_errors +
> >>                  stats->rx_frame_errors  + stats->rx_dropped;
> >>
> >>          stats->tx_window_errors = raw->tx_late_col;
> >> -       stats->tx_fifo_errors = raw->tx_discards;
> >> +       if (!ksz_is_ksz87xx(dev))
> >> +               stats->tx_fifo_errors = raw->tx_discards;
> >>          stats->tx_aborted_errors = raw->tx_exc_col;
> >>          stats->tx_errors = stats->tx_window_errors + stats->tx_fifo_errors +
> >>                  stats->tx_aborted_errors;
> >
> > I am not sure why you have that problem.  In my KSZ8795 board running in
> > kernel 6.16 those counters are working.  Using "ethtool -S lan3" or
> > "ethtool -S eth0" shows rx_total and tx_total.  The "rx_discards" and
> > "tx_discards" are hard to get.  In KSZ8863 the "tx_discards" counter is
> > incremented when the port does not have link and a packet is sent to that
> > port.  In newer switches that behavior was changed.  Occasionally you may
> > get 1 or 2 at the beginning when the tail tagging function is not enabled
> > yet but the MAC sends out packets.  The "rx_discards" count typically
> > seldom happens, but somehow in my first bootup there are many from my
> > KSZ8795 board.
> >
> > Actually that many rx_discards may be a problem I need to find out.
> >
> > I think you are confused about how those MIB counters are read from
> > KSZ8795.  They are not using the code in ksz9477.c but in ksz8.c.
> 
> See [1] TABLE 4-26: PORT MIB COUNTER INDIRECT MEMORY OFFSETS (CONTINUED)
> , page 108 at the very end . Notice the table ends at 0x1F
> TxMultipleCollision .
> 
> See [2] TABLE 5-6: MIB COUNTERS (CONTINUED) , page 219 at the end of the
> table . Notice the table contains four extra entries , 0x80 RxByteCnt ,
> 0x81 TxByteCnt , 0x82 RxDropPackets , 0x83 TXDropPackets .
> 
> These entries are present on KSZ9477 and missing on KSZ8795 .
> 
> This is what this patch attempts to address.

As I said KSZ8795 MIB counters are not using the code in ksz9477.c and
their last counter locations are not the same as KSZ9477.  KSZ9477 uses
ksz9477_r_mib_pkt while KSZ8795 uses ksz8795_r_mib_pkt.  The other
KSZ8895 and KSZ8863 switches uses ksz8863_r_mib_pkt.

The 0x80 and such registers are not used in KSZ8795.  Its registers start
at 0x100, 0x101, ...

They are in table 4-28.

RE: [net-next,PATCH] net: dsa: microchip: Do not count RX/TX Bytes and discards on KSZ87xx

[vtpieter]

> > > Actually that many rx_discards may be a problem I need to find out.
> > >
> > > I think you are confused about how those MIB counters are read from
> > > KSZ8795.  They are not using the code in ksz9477.c but in ksz8.c.
> > 
> > See [1] TABLE 4-26: PORT MIB COUNTER INDIRECT MEMORY OFFSETS (CONTINUED)
> > , page 108 at the very end . Notice the table ends at 0x1F
> > TxMultipleCollision .
> > 
> > See [2] TABLE 5-6: MIB COUNTERS (CONTINUED) , page 219 at the end of the
> > table . Notice the table contains four extra entries , 0x80 RxByteCnt ,
> > 0x81 TxByteCnt , 0x82 RxDropPackets , 0x83 TXDropPackets .
> > 
> > These entries are present on KSZ9477 and missing on KSZ8795 .
> > 
> > This is what this patch attempts to address.
> 
> As I said KSZ8795 MIB counters are not using the code in ksz9477.c and
> their last counter locations are not the same as KSZ9477.  KSZ9477 uses
> ksz9477_r_mib_pkt while KSZ8795 uses ksz8795_r_mib_pkt.  The other
> KSZ8895 and KSZ8863 switches uses ksz8863_r_mib_pkt.
> 
> The 0x80 and such registers are not used in KSZ8795.  Its registers start
> at 0x100, 0x101, ...
> 
> They are in table 4-28.
 
Just wanted to chip in that for me, with a KSZ8794, the iproute2
statistics work as expected as well after commit 0d3edc90c4a0 ("net:
dsa: microchip: fix KSZ87xx family structure wrt the datasheet"). I'm
on a 6.12 kernel and I see the following:

ip -s -h a
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1501 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:d3:36:00:38:06 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::ad3:36ff:fe00:3806/64 scope link 
       valid_lft forever preferred_lft forever
    RX:  bytes packets errors dropped  missed   mcast           
         2.22G   30.3M      0       0       0    922k 
    TX:  bytes packets errors dropped carrier collsns           
         3.70G   19.3M      0       0       0       0 
4: lan1@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 state LOWERLAYERDOWN group default qlen 1000
    link/ether 08:d3:36:00:38:06 brd ff:ff:ff:ff:ff:ff
    RX:  bytes packets errors dropped  missed   mcast           
             0       0      0       0       0       0 
    TX:  bytes packets errors dropped carrier collsns           
             0       0      0       0       0       0 
5: lan2@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP group default qlen 1000
    link/ether 08:d3:36:00:38:06 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::ad3:36ff:fe00:3806/64 scope link 
       valid_lft forever preferred_lft forever
    RX:  bytes packets errors dropped  missed   mcast           
         2.62G   30.3M    250     247       0    922k 
    TX:  bytes packets errors dropped carrier collsns           
         3.61G   19.3M      0       0       0       0 
6: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 08:d3:36:00:38:06 brd ff:ff:ff:ff:ff:ff
    inet 172.18.210.112/26 brd 172.18.210.127 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::ad3:36ff:fe00:3806/64 scope link 
       valid_lft forever preferred_lft forever
    RX:  bytes packets errors dropped  missed   mcast           
         2.19G   30.3M      0    252k       0    922k 
    TX:  bytes packets errors dropped carrier collsns           
         3.60G   19.3M      0       0       0       0 

ethtool -S lan2
NIC statistics:
     tx_packets: 19385247
     tx_bytes: 3615291269
     rx_packets: 30391568
     rx_bytes: 2623613208
     rx_hi: 0
     rx_undersize: 0
     rx_fragments: 0
     rx_oversize: 0
     rx_jabbers: 0
     rx_symbol_err: 3
     rx_crc_err: 3
     rx_align_err: 0
     rx_mac_ctrl: 0
     rx_pause: 0
     rx_bcast: 3985303
     rx_mcast: 924951
     rx_ucast: 25481561
     rx_64_or_less: 5781438
     rx_65_127: 24601395
     rx_128_255: 8744
     rx_256_511: 231
     rx_512_1023: 10
     rx_1024_1522: 3
     rx_1523_2000: 0
     rx_2001: 0
     tx_hi: 0
     tx_late_col: 0
     tx_pause: 0
     tx_bcast: 3
     tx_mcast: 5128
     tx_ucast: 19380278
     tx_deferred: 0
     tx_total_col: 0
     tx_exc_col: 0
     tx_single_col: 0
     tx_mult_col: 0
     rx_total: 2745200072
     tx_total: 3693245281
     rx_discards: 247
     tx_discards: 0