From 0be01b8e0a365138e8f94315de13ab3751d199e2 Mon Sep 17 00:00:00 2001 From: Ivan Khoronzhuk Date: Sat, 10 Dec 2016 14:23:49 +0200 Subject: [PATCH] net: ethernet: ti: cpsw: re-split res only when speed is changed Don't re-split res in the following cases: - speed of phys is not changed - speed of phys is changed and no rate limited channels - speed of phys is changed and all channels are rate limited - phy is unlinked while dev is open - phy is linked back but speed is not changed The maximum speed is sum of "linked" phys, thus res are split taken in account two interfaces, both for dual emac mode and for switch mode. Signed-off-by: Ivan Khoronzhuk Signed-off-by: David S. Miller --- drivers/net/ethernet/ti/cpsw.c | 64 +++++++++++++++++++++++++++++++--- 1 file changed, 59 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index a2c2c06e38e4..7ccfa635d98f 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -394,6 +394,7 @@ struct cpsw_common { u32 irqs_table[IRQ_NUM]; struct cpts *cpts; int rx_ch_num, tx_ch_num; + int speed; }; struct cpsw_priv { @@ -761,7 +762,6 @@ static void cpsw_split_res(struct net_device *ndev) struct cpsw_vector *txv = cpsw->txv; int i, ch_weight, rlim_ch_num = 0; int budget, bigest_rate_ch = 0; - struct cpsw_slave *slave; u32 ch_rate, max_rate; int ch_budget = 0; @@ -781,8 +781,16 @@ static void cpsw_split_res(struct net_device *ndev) bigest_rate = 0; max_rate = consumed_rate; } else { - slave = &cpsw->slaves[cpsw_slave_index(cpsw, priv)]; - max_rate = slave->phy->speed * 1000; + max_rate = cpsw->speed * 1000; + + /* if max_rate is less then expected due to reduced link speed, + * split proportionally according next potential max speed + */ + if (max_rate < consumed_rate) + max_rate *= 10; + + if (max_rate < consumed_rate) + max_rate *= 10; ch_budget = (consumed_rate * CPSW_POLL_WEIGHT) / max_rate; ch_budget = (CPSW_POLL_WEIGHT - ch_budget) / @@ -1013,15 +1021,56 @@ static void _cpsw_adjust_link(struct cpsw_slave *slave, slave->mac_control = mac_control; } +static int cpsw_get_common_speed(struct cpsw_common *cpsw) +{ + int i, speed; + + for (i = 0, speed = 0; i < cpsw->data.slaves; i++) + if (cpsw->slaves[i].phy && cpsw->slaves[i].phy->link) + speed += cpsw->slaves[i].phy->speed; + + return speed; +} + +static int cpsw_need_resplit(struct cpsw_common *cpsw) +{ + int i, rlim_ch_num; + int speed, ch_rate; + + /* re-split resources only in case speed was changed */ + speed = cpsw_get_common_speed(cpsw); + if (speed == cpsw->speed || !speed) + return 0; + + cpsw->speed = speed; + + for (i = 0, rlim_ch_num = 0; i < cpsw->tx_ch_num; i++) { + ch_rate = cpdma_chan_get_rate(cpsw->txv[i].ch); + if (!ch_rate) + break; + + rlim_ch_num++; + } + + /* cases not dependent on speed */ + if (!rlim_ch_num || rlim_ch_num == cpsw->tx_ch_num) + return 0; + + return 1; +} + static void cpsw_adjust_link(struct net_device *ndev) { struct cpsw_priv *priv = netdev_priv(ndev); + struct cpsw_common *cpsw = priv->cpsw; bool link = false; for_each_slave(priv, _cpsw_adjust_link, priv, &link); if (link) { - cpsw_split_res(priv->ndev); + if (cpsw_need_resplit(cpsw)) + cpsw_split_res(ndev); + netif_carrier_on(ndev); if (netif_running(ndev)) netif_tx_wake_all_queues(ndev); @@ -1538,6 +1587,10 @@ static int cpsw_ndo_stop(struct net_device *ndev) cpsw_ale_stop(cpsw->ale); } for_each_slave(priv, cpsw_slave_stop, cpsw); + + if (cpsw_need_resplit(cpsw)) + cpsw_split_res(ndev); + pm_runtime_put_sync(cpsw->dev); if (cpsw->data.dual_emac) cpsw->slaves[priv->emac_port].open_stat = false; @@ -1983,7 +2036,7 @@ static int cpsw_ndo_set_tx_maxrate(struct net_device *ndev, int queue, u32 rate) return -EINVAL; } - if (rate > 2000) { + if (rate > cpsw->speed) { dev_err(priv->dev, "The channel rate cannot be more than 2Gbps"); return -EINVAL; } @@ -2998,6 +3051,7 @@ static int cpsw_probe(struct platform_device *pdev) ndev->ethtool_ops = &cpsw_ethtool_ops; netif_napi_add(ndev, &cpsw->napi_rx, cpsw_rx_poll, CPSW_POLL_WEIGHT); netif_tx_napi_add(ndev, &cpsw->napi_tx, cpsw_tx_poll, CPSW_POLL_WEIGHT); + cpsw_split_res(ndev); /* register the network device */ SET_NETDEV_DEV(ndev, &pdev->dev); -- 2.20.1