From: Ivan Khoronzhuk Date: Mon, 22 Aug 2016 18:18:28 +0000 (+0300) Subject: net: ethernet: ti: cpsw: add ethtool channels support X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ce52c744574b;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git net: ethernet: ti: cpsw: add ethtool channels support These ops allow to control number of channels driver is allowed to work with at cpdma level. The maximum number of channels is 8 for rx and 8 for tx. In dual_emac mode the h/w channels are shared between two interfaces and changing number on one interface changes number of channels on another. How many channels are supported and enabled: $ ethtool -l ethX Change number of channels (up to 8) $ ethtool -L ethX rx 6 tx 6 Per-channel statistic: $ ethtool -S ethX Signed-off-by: Ivan Khoronzhuk Reviewed-by: Mugunthan V N Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 1fbb50f25603..4273e7f9b4aa 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -736,6 +736,11 @@ static void cpsw_rx_handler(void *token, int len, int status) } requeue: + if (netif_dormant(ndev)) { + dev_kfree_skb_any(new_skb); + return; + } + ch = cpsw->rxch[skb_get_queue_mapping(new_skb)]; ret = cpdma_chan_submit(ch, new_skb, new_skb->data, skb_tailroom(new_skb), 0); @@ -2060,6 +2065,179 @@ static void cpsw_ethtool_op_complete(struct net_device *ndev) cpsw_err(priv, drv, "ethtool complete failed %d\n", ret); } +static void cpsw_get_channels(struct net_device *ndev, + struct ethtool_channels *ch) +{ + struct cpsw_common *cpsw = ndev_to_cpsw(ndev); + + ch->max_combined = 0; + ch->max_rx = CPSW_MAX_QUEUES; + ch->max_tx = CPSW_MAX_QUEUES; + ch->max_other = 0; + ch->other_count = 0; + ch->rx_count = cpsw->rx_ch_num; + ch->tx_count = cpsw->tx_ch_num; + ch->combined_count = 0; +} + +static int cpsw_check_ch_settings(struct cpsw_common *cpsw, + struct ethtool_channels *ch) +{ + if (ch->combined_count) + return -EINVAL; + + /* verify we have at least one channel in each direction */ + if (!ch->rx_count || !ch->tx_count) + return -EINVAL; + + if (ch->rx_count > cpsw->data.channels || + ch->tx_count > cpsw->data.channels) + return -EINVAL; + + return 0; +} + +static int cpsw_update_channels_res(struct cpsw_priv *priv, int ch_num, int rx) +{ + int (*poll)(struct napi_struct *, int); + struct cpsw_common *cpsw = priv->cpsw; + void (*handler)(void *, int, int); + struct cpdma_chan **chan; + int ret, *ch; + + if (rx) { + ch = &cpsw->rx_ch_num; + chan = cpsw->rxch; + handler = cpsw_rx_handler; + poll = cpsw_rx_poll; + } else { + ch = &cpsw->tx_ch_num; + chan = cpsw->txch; + handler = cpsw_tx_handler; + poll = cpsw_tx_poll; + } + + while (*ch < ch_num) { + chan[*ch] = cpdma_chan_create(cpsw->dma, *ch, handler, rx); + + if (IS_ERR(chan[*ch])) + return PTR_ERR(chan[*ch]); + + if (!chan[*ch]) + return -EINVAL; + + cpsw_info(priv, ifup, "created new %d %s channel\n", *ch, + (rx ? "rx" : "tx")); + (*ch)++; + } + + while (*ch > ch_num) { + (*ch)--; + + ret = cpdma_chan_destroy(chan[*ch]); + if (ret) + return ret; + + cpsw_info(priv, ifup, "destroyed %d %s channel\n", *ch, + (rx ? "rx" : "tx")); + } + + return 0; +} + +static int cpsw_update_channels(struct cpsw_priv *priv, + struct ethtool_channels *ch) +{ + int ret; + + ret = cpsw_update_channels_res(priv, ch->rx_count, 1); + if (ret) + return ret; + + ret = cpsw_update_channels_res(priv, ch->tx_count, 0); + if (ret) + return ret; + + return 0; +} + +static int cpsw_set_channels(struct net_device *ndev, + struct ethtool_channels *chs) +{ + struct cpsw_priv *priv = netdev_priv(ndev); + struct cpsw_common *cpsw = priv->cpsw; + struct cpsw_slave *slave; + int i, ret; + + ret = cpsw_check_ch_settings(cpsw, chs); + if (ret < 0) + return ret; + + /* Disable NAPI scheduling */ + cpsw_intr_disable(cpsw); + + /* Stop all transmit queues for every network device. + * Disable re-using rx descriptors with dormant_on. + */ + for (i = cpsw->data.slaves, slave = cpsw->slaves; i; i--, slave++) { + if (!(slave->ndev && netif_running(slave->ndev))) + continue; + + netif_tx_stop_all_queues(slave->ndev); + netif_dormant_on(slave->ndev); + } + + /* Handle rest of tx packets and stop cpdma channels */ + cpdma_ctlr_stop(cpsw->dma); + ret = cpsw_update_channels(priv, chs); + if (ret) + goto err; + + for (i = cpsw->data.slaves, slave = cpsw->slaves; i; i--, slave++) { + if (!(slave->ndev && netif_running(slave->ndev))) + continue; + + /* Inform stack about new count of queues */ + ret = netif_set_real_num_tx_queues(slave->ndev, + cpsw->tx_ch_num); + if (ret) { + dev_err(priv->dev, "cannot set real number of tx queues\n"); + goto err; + } + + ret = netif_set_real_num_rx_queues(slave->ndev, + cpsw->rx_ch_num); + if (ret) { + dev_err(priv->dev, "cannot set real number of rx queues\n"); + goto err; + } + + /* Enable rx packets handling */ + netif_dormant_off(slave->ndev); + } + + if (cpsw_common_res_usage_state(cpsw)) { + if (cpsw_fill_rx_channels(priv)) + goto err; + + /* After this receive is started */ + cpdma_ctlr_start(cpsw->dma); + cpsw_intr_enable(cpsw); + } + + /* Resume transmit for every affected interface */ + for (i = cpsw->data.slaves, slave = cpsw->slaves; i; i--, slave++) { + if (!(slave->ndev && netif_running(slave->ndev))) + continue; + netif_tx_start_all_queues(slave->ndev); + } + return 0; +err: + dev_err(priv->dev, "cannot update channels number, closing device\n"); + dev_close(ndev); + return ret; +} + static const struct ethtool_ops cpsw_ethtool_ops = { .get_drvinfo = cpsw_get_drvinfo, .get_msglevel = cpsw_get_msglevel, @@ -2081,6 +2259,8 @@ static const struct ethtool_ops cpsw_ethtool_ops = { .get_regs = cpsw_get_regs, .begin = cpsw_ethtool_op_begin, .complete = cpsw_ethtool_op_complete, + .get_channels = cpsw_get_channels, + .set_channels = cpsw_set_channels, }; static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_common *cpsw,