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Date: Wed, 17 Aug 2016 11:52:03 +0530
From: Mugunthan V N <mugunthanvnm@...com>
To: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
<davem@...emloft.net>, <netdev@...r.kernel.org>,
<grygorii.strashko@...com>
CC: <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<nsekhar@...com>
Subject: Re: [PATCH v3 5/5] net: ethernet: ti: cpsw: add ethtool channels
support
On Tuesday 16 August 2016 04:55 AM, Ivan Khoronzhuk wrote:
> 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 <ivan.khoronzhuk@...aro.org>
> ---
> drivers/net/ethernet/ti/cpsw.c | 180 ++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 176 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 6dcbd8a..f02e577 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -735,6 +735,11 @@ 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);
> @@ -1267,9 +1272,8 @@ static void cpsw_init_host_port(struct cpsw_priv *priv)
> }
> }
>
> -static int cpsw_fill_rx_channels(struct net_device *ndev)
> +static int cpsw_fill_rx_channels(struct cpsw_priv *priv)
This change can be moved to patch 1/5 where the function definition is
added at first.
> {
> - struct cpsw_priv *priv = netdev_priv(ndev);
> struct cpsw_common *cpsw = priv->cpsw;
> struct sk_buff *skb;
> int ch, i, ret;
> @@ -1279,7 +1283,7 @@ static int cpsw_fill_rx_channels(struct net_device *ndev)
>
> ch_buf_num = cpdma_chan_get_rx_buf_num(cpsw->rxch[ch]);
> for (i = 0; i < ch_buf_num; i++) {
> - skb = __netdev_alloc_skb_ip_align(ndev,
> + skb = __netdev_alloc_skb_ip_align(priv->ndev,
> cpsw->rx_packet_max,
> GFP_KERNEL);
> if (!skb) {
> @@ -1397,7 +1401,7 @@ static int cpsw_ndo_open(struct net_device *ndev)
> enable_irq(cpsw->irqs_table[0]);
> }
>
> - ret = cpsw_fill_rx_channels(ndev);
> + ret = cpsw_fill_rx_channels(priv);
> if (ret < 0)
> goto err_cleanup;
>
> @@ -2060,6 +2064,172 @@ 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;
> +
> + cpsw_intr_disable(cpsw);
> +
> + 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);
> + }
> +
> + 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;
> + }
> +
> + netif_dormant_off(slave->ndev);
> + }
> +
> + if (cpsw_common_res_usage_state(cpsw)) {
> + if (cpsw_fill_rx_channels(priv))
> + goto err;
> +
> + cpdma_ctlr_start(cpsw->dma);
> + cpsw_intr_enable(cpsw);
> + }
> +
> + 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 +2251,8 @@ 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,
>
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