diff options
| author | Oleksij Rempel <o.rempel@pengutronix.de> | 2020-09-11 10:25:28 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-09-11 14:45:54 -0700 |
| commit | 2fb7357d50efaffc43409cd2cfe30d6ceebff315 (patch) | |
| tree | 68186e2880d057fec6251ea90347895a38e68be3 | |
| parent | 3558698b9fdff6d9097c48e5b9eab81a35d6afdf (diff) | |
net: ag71xx: add flow control support
Add flow control support. The functionality was tested on AR9331 SoC and
confirmed by iperf3 results and HW counters exported over ethtool.
Following test configurations was used:
iMX6S receiver <--- TL-SG1005D switch <---- AR9331 sender
The switch is supporting symmytric flow control:
Settings for eth0:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
--->> Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on
Port: MII
PHYAD: 4
Transceiver: external
Link detected: yes
The iMX6S system was configured to 10Mbit, to let the switch use flow
control:
- ethtool -s eth0 speed 10
With flow control disabled on AR9331:
- ethtool -A eth0 rx off tx off
- iperf3 -u -c 172.17.0.1 -b100M -l1472 -t10
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 66.2 MBytes 55.5 Mbits/sec 0.000 ms 0/47155 (0%) sender
[ 5] 0.00-10.04 sec 11.5 MBytes 9.57 Mbits/sec 1.309 ms 38986/47146 (83%) receiver
With flow control enabled on AR9331:
- ethtool -A eth0 rx on tx on
- iperf3 -u -c 172.17.0.1 -b100M -l1472 -t10
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 15.1 MBytes 12.6 Mbits/sec 0.000 ms 0/10727 (0%) sender
[ 5] 0.00-10.05 sec 11.5 MBytes 9.57 Mbits/sec 1.371 ms 2525/10689 (24%) receiver
Similar results are get in opposite direction by introducing extra CPU
load on AR9331:
- chrt 40 dd if=/dev/zero of=/dev/null &
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/atheros/ag71xx.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c index 8c80a87aee58..dd5c8a9038bb 100644 --- a/drivers/net/ethernet/atheros/ag71xx.c +++ b/drivers/net/ethernet/atheros/ag71xx.c @@ -1056,6 +1056,8 @@ static void ag71xx_mac_validate(struct phylink_config *config, phylink_set(mask, MII); + phylink_set(mask, Pause); + phylink_set(mask, Asym_Pause); phylink_set(mask, Autoneg); phylink_set(mask, 10baseT_Half); phylink_set(mask, 10baseT_Full); @@ -1106,7 +1108,7 @@ static void ag71xx_mac_link_up(struct phylink_config *config, bool tx_pause, bool rx_pause) { struct ag71xx *ag = netdev_priv(to_net_dev(config->dev)); - u32 cfg2; + u32 cfg1, cfg2; u32 ifctl; u32 fifo5; @@ -1140,6 +1142,15 @@ static void ag71xx_mac_link_up(struct phylink_config *config, ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5); ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl); + cfg1 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG1); + cfg1 &= ~(MAC_CFG1_TFC | MAC_CFG1_RFC); + if (tx_pause) + cfg1 |= MAC_CFG1_TFC; + + if (rx_pause) + cfg1 |= MAC_CFG1_RFC; + ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, cfg1); + ag71xx_hw_start(ag); } |