[PATCH net-next v3 0/3] Enable 2.5Gbps speed for stmmac

From: Michael Sit Wei Hong
Date: Thu May 27 2021 - 05:29:58 EST

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Intel mGbE supports 2.5Gbps link speed by overclocking the clock rate
by 2.5 times to support 2.5Gbps link speed. In this mode, the serdes/PHY
operates at a serial baud rate of 3.125 Gbps and the PCS data path and
GMII interface of the MAC operate at 312.5 MHz instead of 125 MHz.
This is configured in the BIOS during boot up. The kernel driver is not able
access to modify the clock rate for 1Gbps/2.5G mode on the fly. The way to
determine the current 1G/2.5G mode is by reading a dedicated adhoc
register through mdio bus.

Changes:
v2 -> v3
patch 1/3
-New patch added to restructure the code. enabling reading the dedicated
adhoc register to determine link speed mode.

patch 2/3
-Restructure for 2.5G speed to use 2500BaseX configuration as the
PHY interface.

patch 3/3
-Restructure to read serdes registers to set max_speed and configure to
use 2500BaseX in 2.5G speeds.

v1 -> v2
patch 1/2
-Remove MAC supported link speed masking

patch 2/2
-Add supported link speed masking in the PCS

iperf3 and ping for 2.5Gbps and regression test on 10M/100M/1000Mbps
is done to prevent regresson issues.

2500Mbps
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.526 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.509 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.507 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.508 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.539 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=0.516 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.548 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=0.513 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.509 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=0.508 ms

--- 192.168.1.1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9222ms
rtt min/avg/max/mdev = 0.507/0.518/0.548/0.013 ms

Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.2 port 40092 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 205 MBytes 1.72 Gbits/sec 0 604 KBytes
[ 5] 1.00-2.00 sec 205 MBytes 1.72 Gbits/sec 0 632 KBytes
[ 5] 2.00-3.00 sec 205 MBytes 1.72 Gbits/sec 0 632 KBytes
[ 5] 3.00-4.00 sec 206 MBytes 1.73 Gbits/sec 0 632 KBytes
[ 5] 4.00-5.00 sec 205 MBytes 1.72 Gbits/sec 0 632 KBytes
[ 5] 5.00-6.00 sec 206 MBytes 1.73 Gbits/sec 0 632 KBytes
[ 5] 6.00-7.00 sec 204 MBytes 1.71 Gbits/sec 0 632 KBytes
[ 5] 7.00-8.00 sec 206 MBytes 1.73 Gbits/sec 0 632 KBytes
[ 5] 8.00-9.00 sec 205 MBytes 1.72 Gbits/sec 0 632 KBytes
[ 5] 9.00-10.00 sec 206 MBytes 1.73 Gbits/sec 0 632 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 2.00 GBytes 1.72 Gbits/sec 0 sender
[ 5] 0.00-10.00 sec 2.00 GBytes 1.72 Gbits/sec receiver

iperf Done.

10Mbps
host@EHL$ ethtool -s enp0s30f4 duplex full speed 10
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.46 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.761 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.744 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.753 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.746 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=0.786 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.740 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=0.757 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.742 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=0.772 ms

--- 192.168.1.1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9208ms
rtt min/avg/max/mdev = 0.740/0.826/1.461/0.212 ms

Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.2 port 35304 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 1.26 MBytes 10.6 Mbits/sec 0 29.7 KBytes
[ 5] 1.00-2.00 sec 1.09 MBytes 9.17 Mbits/sec 0 29.7 KBytes
[ 5] 2.00-3.00 sec 1.09 MBytes 9.17 Mbits/sec 0 29.7 KBytes
[ 5] 3.00-4.00 sec 1.15 MBytes 9.68 Mbits/sec 0 29.7 KBytes
[ 5] 4.00-5.00 sec 1.09 MBytes 9.17 Mbits/sec 0 29.7 KBytes
[ 5] 5.00-6.00 sec 1.09 MBytes 9.17 Mbits/sec 0 29.7 KBytes
[ 5] 6.00-7.00 sec 1.15 MBytes 9.68 Mbits/sec 0 29.7 KBytes
[ 5] 7.00-8.00 sec 1.09 MBytes 9.17 Mbits/sec 0 29.7 KBytes
[ 5] 8.00-9.00 sec 1.09 MBytes 9.17 Mbits/sec 0 29.7 KBytes
[ 5] 9.00-10.00 sec 1.15 MBytes 9.68 Mbits/sec 0 29.7 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 11.3 MBytes 9.47 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 11.1 MBytes 9.33 Mbits/sec receiver

iperf Done.

100Mbps
host@EHL$ ethtool -s enp0s30f4 duplex full speed 100
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.05 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.535 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.522 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.529 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.523 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=0.543 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.553 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=0.542 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.517 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=0.515 ms

--- 192.168.1.1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9233ms
rtt min/avg/max/mdev = 0.515/0.582/1.048/0.155 ms

Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.2 port 35308 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 11.8 MBytes 99.1 Mbits/sec 0 147 KBytes
[ 5] 1.00-2.00 sec 10.9 MBytes 91.2 Mbits/sec 0 187 KBytes
[ 5] 2.00-3.00 sec 11.4 MBytes 95.4 Mbits/sec 0 230 KBytes
[ 5] 3.00-4.00 sec 10.9 MBytes 91.7 Mbits/sec 0 230 KBytes
[ 5] 4.00-5.00 sec 10.4 MBytes 87.6 Mbits/sec 0 230 KBytes
[ 5] 5.00-6.00 sec 10.9 MBytes 91.7 Mbits/sec 0 230 KBytes
[ 5] 6.00-7.00 sec 10.9 MBytes 91.7 Mbits/sec 0 230 KBytes
[ 5] 7.00-8.00 sec 10.9 MBytes 91.7 Mbits/sec 0 230 KBytes
[ 5] 8.00-9.00 sec 10.9 MBytes 91.7 Mbits/sec 0 230 KBytes
[ 5] 9.00-10.00 sec 10.9 MBytes 91.7 Mbits/sec 0 230 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 110 MBytes 92.4 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 109 MBytes 91.5 Mbits/sec receiver

iperf Done.

1000Mbps
host@EHL$ ethtool -s enp0s30f4 duplex full speed 1000
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.02 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.507 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.539 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.506 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.504 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=0.489 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.499 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=0.483 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.480 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=0.493 ms

--- 192.168.1.1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9213ms
rtt min/avg/max/mdev = 0.480/0.551/1.015/0.155 ms

Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.2 port 35312 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 114 MBytes 960 Mbits/sec 0 437 KBytes
[ 5] 1.00-2.00 sec 112 MBytes 940 Mbits/sec 0 437 KBytes
[ 5] 2.00-3.00 sec 112 MBytes 937 Mbits/sec 0 437 KBytes
[ 5] 3.00-4.00 sec 112 MBytes 941 Mbits/sec 0 437 KBytes
[ 5] 4.00-5.00 sec 112 MBytes 939 Mbits/sec 0 457 KBytes
[ 5] 5.00-6.00 sec 112 MBytes 941 Mbits/sec 0 457 KBytes
[ 5] 6.00-7.00 sec 112 MBytes 944 Mbits/sec 0 457 KBytes
[ 5] 7.00-8.00 sec 112 MBytes 937 Mbits/sec 0 457 KBytes
[ 5] 8.00-9.00 sec 113 MBytes 946 Mbits/sec 0 457 KBytes
[ 5] 9.00-10.00 sec 112 MBytes 937 Mbits/sec 0 457 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 1.10 GBytes 942 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 1.10 GBytes 941 Mbits/sec receiver

iperf Done.

Voon Weifeng (3):
net: stmmac: split xPCS setup from mdio register
net: pcs: add 2500BASEX support for Intel mGbE controller
net: stmmac: enable Intel mGbE 2.5Gbps link speed

.../net/ethernet/stmicro/stmmac/dwmac-intel.c | 48 +++++++++++++-
.../net/ethernet/stmicro/stmmac/dwmac-intel.h | 13 ++++
.../net/ethernet/stmicro/stmmac/dwmac4_core.c | 1 +
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 +
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 14 ++++
.../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 64 +++++++++++--------
drivers/net/pcs/pcs-xpcs.c | 60 +++++++++++++++++
include/linux/pcs/pcs-xpcs.h | 1 +
include/linux/stmmac.h | 1 +
9 files changed, 175 insertions(+), 28 deletions(-)

--
2.17.1

Next message: Michael Sit Wei Hong: "[PATCH net-next v3 1/3] net: stmmac: split xPCS setup from mdio register"
Previous message: Janosch Frank: "Re: [PATCH v1 06/11] KVM: s390: pv: usage counter instead of flag"
Next in thread: Michael Sit Wei Hong: "[PATCH net-next v3 1/3] net: stmmac: split xPCS setup from mdio register"
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