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Date: Tue, 6 Dec 2016 03:45:00 +0200
From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To: mugunthanvnm@...com, grygorii.strashko@...com
Cc: linux-omap@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: [PATCH] net: ethernet: ti: cpsw: fix early budget split
The budget split function requires the phy speed to be known.
While ndo open a phy speed identification is postponed till the
moment link is up. Hence, move it to appropriate callback, when link
is up.
Reported-by: Grygorii Strashko <grygorii.strashko@...com>
Fixes: 8feb0a196507 ("net: ethernet: ti: cpsw: split tx budget according between channels")
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
---
Based on net-next/master
drivers/net/ethernet/ti/cpsw.c | 154 ++++++++++++++++++++---------------------
1 file changed, 77 insertions(+), 77 deletions(-)
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 3f96c57..f373a4b 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -753,6 +753,82 @@ static void cpsw_rx_handler(void *token, int len, int status)
dev_kfree_skb_any(new_skb);
}
+/* split budget depending on channel rates */
+static void cpsw_split_budget(struct net_device *ndev)
+{
+ struct cpsw_priv *priv = netdev_priv(ndev);
+ struct cpsw_common *cpsw = priv->cpsw;
+ struct cpsw_vector *txv = cpsw->txv;
+ u32 consumed_rate, bigest_rate = 0;
+ int budget, bigest_rate_ch = 0;
+ struct cpsw_slave *slave;
+ int i, rlim_ch_num = 0;
+ u32 ch_rate, max_rate;
+ int ch_budget = 0;
+
+ if (cpsw->data.dual_emac)
+ slave = &cpsw->slaves[priv->emac_port];
+ else
+ slave = &cpsw->slaves[cpsw->data.active_slave];
+
+ max_rate = slave->phy->speed * 1000;
+
+ consumed_rate = 0;
+ for (i = 0; i < cpsw->tx_ch_num; i++) {
+ ch_rate = cpdma_chan_get_rate(txv[i].ch);
+ if (!ch_rate)
+ continue;
+
+ rlim_ch_num++;
+ consumed_rate += ch_rate;
+ }
+
+ if (cpsw->tx_ch_num == rlim_ch_num) {
+ max_rate = consumed_rate;
+ } else {
+ ch_budget = (consumed_rate * CPSW_POLL_WEIGHT) / max_rate;
+ ch_budget = (CPSW_POLL_WEIGHT - ch_budget) /
+ (cpsw->tx_ch_num - rlim_ch_num);
+ bigest_rate = (max_rate - consumed_rate) /
+ (cpsw->tx_ch_num - rlim_ch_num);
+ }
+
+ /* split tx budget */
+ budget = CPSW_POLL_WEIGHT;
+ for (i = 0; i < cpsw->tx_ch_num; i++) {
+ ch_rate = cpdma_chan_get_rate(txv[i].ch);
+ if (ch_rate) {
+ txv[i].budget = (ch_rate * CPSW_POLL_WEIGHT) / max_rate;
+ if (!txv[i].budget)
+ txv[i].budget = 1;
+ if (ch_rate > bigest_rate) {
+ bigest_rate_ch = i;
+ bigest_rate = ch_rate;
+ }
+ } else {
+ txv[i].budget = ch_budget;
+ if (!bigest_rate_ch)
+ bigest_rate_ch = i;
+ }
+
+ budget -= txv[i].budget;
+ }
+
+ if (budget)
+ txv[bigest_rate_ch].budget += budget;
+
+ /* split rx budget */
+ budget = CPSW_POLL_WEIGHT;
+ ch_budget = budget / cpsw->rx_ch_num;
+ for (i = 0; i < cpsw->rx_ch_num; i++) {
+ cpsw->rxv[i].budget = ch_budget;
+ budget -= ch_budget;
+ }
+
+ if (budget)
+ cpsw->rxv[0].budget += budget;
+}
+
static irqreturn_t cpsw_tx_interrupt(int irq, void *dev_id)
{
struct cpsw_common *cpsw = dev_id;
@@ -941,6 +1017,7 @@ static void cpsw_adjust_link(struct net_device *ndev)
for_each_slave(priv, _cpsw_adjust_link, priv, &link);
if (link) {
+ cpsw_split_budget(priv->ndev);
netif_carrier_on(ndev);
if (netif_running(ndev))
netif_tx_wake_all_queues(ndev);
@@ -1280,82 +1357,6 @@ static void cpsw_init_host_port(struct cpsw_priv *priv)
}
}
-/* split budget depending on channel rates */
-static void cpsw_split_budget(struct net_device *ndev)
-{
- struct cpsw_priv *priv = netdev_priv(ndev);
- struct cpsw_common *cpsw = priv->cpsw;
- struct cpsw_vector *txv = cpsw->txv;
- u32 consumed_rate, bigest_rate = 0;
- int budget, bigest_rate_ch = 0;
- struct cpsw_slave *slave;
- int i, rlim_ch_num = 0;
- u32 ch_rate, max_rate;
- int ch_budget = 0;
-
- if (cpsw->data.dual_emac)
- slave = &cpsw->slaves[priv->emac_port];
- else
- slave = &cpsw->slaves[cpsw->data.active_slave];
-
- max_rate = slave->phy->speed * 1000;
-
- consumed_rate = 0;
- for (i = 0; i < cpsw->tx_ch_num; i++) {
- ch_rate = cpdma_chan_get_rate(txv[i].ch);
- if (!ch_rate)
- continue;
-
- rlim_ch_num++;
- consumed_rate += ch_rate;
- }
-
- if (cpsw->tx_ch_num == rlim_ch_num) {
- max_rate = consumed_rate;
- } else {
- ch_budget = (consumed_rate * CPSW_POLL_WEIGHT) / max_rate;
- ch_budget = (CPSW_POLL_WEIGHT - ch_budget) /
- (cpsw->tx_ch_num - rlim_ch_num);
- bigest_rate = (max_rate - consumed_rate) /
- (cpsw->tx_ch_num - rlim_ch_num);
- }
-
- /* split tx budget */
- budget = CPSW_POLL_WEIGHT;
- for (i = 0; i < cpsw->tx_ch_num; i++) {
- ch_rate = cpdma_chan_get_rate(txv[i].ch);
- if (ch_rate) {
- txv[i].budget = (ch_rate * CPSW_POLL_WEIGHT) / max_rate;
- if (!txv[i].budget)
- txv[i].budget = 1;
- if (ch_rate > bigest_rate) {
- bigest_rate_ch = i;
- bigest_rate = ch_rate;
- }
- } else {
- txv[i].budget = ch_budget;
- if (!bigest_rate_ch)
- bigest_rate_ch = i;
- }
-
- budget -= txv[i].budget;
- }
-
- if (budget)
- txv[bigest_rate_ch].budget += budget;
-
- /* split rx budget */
- budget = CPSW_POLL_WEIGHT;
- ch_budget = budget / cpsw->rx_ch_num;
- for (i = 0; i < cpsw->rx_ch_num; i++) {
- cpsw->rxv[i].budget = ch_budget;
- budget -= ch_budget;
- }
-
- if (budget)
- cpsw->rxv[0].budget += budget;
-}
-
static int cpsw_fill_rx_channels(struct cpsw_priv *priv)
{
struct cpsw_common *cpsw = priv->cpsw;
@@ -1501,7 +1502,6 @@ static int cpsw_ndo_open(struct net_device *ndev)
cpsw_set_coalesce(ndev, &coal);
}
- cpsw_split_budget(ndev);
cpdma_ctlr_start(cpsw->dma);
cpsw_intr_enable(cpsw);
--
2.7.4
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