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net: ethernet: ti: cpsw: add ethtool channels support

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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@linaro.org>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ivan Khoronzhuk 2016-08-22 21:18:28 +03:00 committed by David S. Miller
parent 925d65e6d8
commit ce52c74457
1 changed files with 180 additions and 0 deletions
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180
drivers/net/ethernet/ti/cpsw.c
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@ -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,