Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934030AbcK2PCK (ORCPT ); Tue, 29 Nov 2016 10:02:10 -0500 Received: from mail-lf0-f50.google.com ([209.85.215.50]:36731 "EHLO mail-lf0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933958AbcK2PB0 (ORCPT ); Tue, 29 Nov 2016 10:01:26 -0500 From: Ivan Khoronzhuk To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, mugunthanvnm@ti.com, grygorii.strashko@ti.com Cc: linux-omap@vger.kernel.org, Ivan Khoronzhuk Subject: [PATCH 5/5] net: ethernet: ti: cpsw: split tx budget according between channels Date: Tue, 29 Nov 2016 17:00:51 +0200 Message-Id: <1480431651-6081-6-git-send-email-ivan.khoronzhuk@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1480431651-6081-1-git-send-email-ivan.khoronzhuk@linaro.org> References: <1480431651-6081-1-git-send-email-ivan.khoronzhuk@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10481 Lines: 339 Split device budget between channels according to channel rate. Signed-off-by: Ivan Khoronzhuk --- drivers/net/ethernet/ti/cpsw.c | 159 +++++++++++++++++++++++++++++++++-------- 1 file changed, 130 insertions(+), 29 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 8a70298..ec4873f 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -365,6 +365,11 @@ static inline void slave_write(struct cpsw_slave *slave, u32 val, u32 offset) __raw_writel(val, slave->regs + offset); } +struct cpsw_vector { + struct cpdma_chan *ch; + int budget; +}; + struct cpsw_common { struct device *dev; struct cpsw_platform_data data; @@ -380,8 +385,8 @@ struct cpsw_common { int rx_packet_max; struct cpsw_slave *slaves; struct cpdma_ctlr *dma; - struct cpdma_chan *txch[CPSW_MAX_QUEUES]; - struct cpdma_chan *rxch[CPSW_MAX_QUEUES]; + struct cpsw_vector txv[CPSW_MAX_QUEUES]; + struct cpsw_vector rxv[CPSW_MAX_QUEUES]; struct cpsw_ale *ale; bool quirk_irq; bool rx_irq_disabled; @@ -741,7 +746,7 @@ static void cpsw_rx_handler(void *token, int len, int status) return; } - ch = cpsw->rxch[skb_get_queue_mapping(new_skb)]; + ch = cpsw->rxv[skb_get_queue_mapping(new_skb)].ch; ret = cpdma_chan_submit(ch, new_skb, new_skb->data, skb_tailroom(new_skb), 0); if (WARN_ON(ret < 0)) @@ -783,8 +788,9 @@ static irqreturn_t cpsw_rx_interrupt(int irq, void *dev_id) static int cpsw_tx_poll(struct napi_struct *napi_tx, int budget) { u32 ch_map; - int num_tx, ch; + int num_tx, cur_budget, ch; struct cpsw_common *cpsw = napi_to_cpsw(napi_tx); + struct cpsw_vector *txv; /* process every unprocessed channel */ ch_map = cpdma_ctrl_txchs_state(cpsw->dma); @@ -792,7 +798,13 @@ static int cpsw_tx_poll(struct napi_struct *napi_tx, int budget) if (!(ch_map & 0x01)) continue; - num_tx += cpdma_chan_process(cpsw->txch[ch], budget - num_tx); + txv = &cpsw->txv[ch]; + if (unlikely(txv->budget > budget - num_tx)) + cur_budget = budget - num_tx; + else + cur_budget = txv->budget; + + num_tx += cpdma_chan_process(txv->ch, cur_budget); if (num_tx >= budget) break; } @@ -812,8 +824,9 @@ static int cpsw_tx_poll(struct napi_struct *napi_tx, int budget) static int cpsw_rx_poll(struct napi_struct *napi_rx, int budget) { u32 ch_map; - int num_rx, ch; + int num_rx, cur_budget, ch; struct cpsw_common *cpsw = napi_to_cpsw(napi_rx); + struct cpsw_vector *rxv; /* process every unprocessed channel */ ch_map = cpdma_ctrl_rxchs_state(cpsw->dma); @@ -821,7 +834,13 @@ static int cpsw_rx_poll(struct napi_struct *napi_rx, int budget) if (!(ch_map & 0x01)) continue; - num_rx += cpdma_chan_process(cpsw->rxch[ch], budget - num_rx); + rxv = &cpsw->rxv[ch]; + if (unlikely(rxv->budget > budget - num_rx)) + cur_budget = budget - num_rx; + else + cur_budget = rxv->budget; + + num_rx += cpdma_chan_process(rxv->ch, cur_budget); if (num_rx >= budget) break; } @@ -1063,7 +1082,7 @@ static void cpsw_get_ethtool_stats(struct net_device *ndev, cpsw_gstrings_stats[l].stat_offset); for (ch = 0; ch < cpsw->rx_ch_num; ch++) { - cpdma_chan_get_stats(cpsw->rxch[ch], &ch_stats); + cpdma_chan_get_stats(cpsw->rxv[ch].ch, &ch_stats); for (i = 0; i < CPSW_STATS_CH_LEN; i++, l++) { p = (u8 *)&ch_stats + cpsw_gstrings_ch_stats[i].stat_offset; @@ -1072,7 +1091,7 @@ static void cpsw_get_ethtool_stats(struct net_device *ndev, } for (ch = 0; ch < cpsw->tx_ch_num; ch++) { - cpdma_chan_get_stats(cpsw->txch[ch], &ch_stats); + cpdma_chan_get_stats(cpsw->txv[ch].ch, &ch_stats); for (i = 0; i < CPSW_STATS_CH_LEN; i++, l++) { p = (u8 *)&ch_stats + cpsw_gstrings_ch_stats[i].stat_offset; @@ -1261,6 +1280,82 @@ 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; @@ -1269,7 +1364,7 @@ static int cpsw_fill_rx_channels(struct cpsw_priv *priv) int ch, i, ret; for (ch = 0; ch < cpsw->rx_ch_num; ch++) { - ch_buf_num = cpdma_chan_get_rx_buf_num(cpsw->rxch[ch]); + ch_buf_num = cpdma_chan_get_rx_buf_num(cpsw->rxv[ch].ch); for (i = 0; i < ch_buf_num; i++) { skb = __netdev_alloc_skb_ip_align(priv->ndev, cpsw->rx_packet_max, @@ -1280,8 +1375,9 @@ static int cpsw_fill_rx_channels(struct cpsw_priv *priv) } skb_set_queue_mapping(skb, ch); - ret = cpdma_chan_submit(cpsw->rxch[ch], skb, skb->data, - skb_tailroom(skb), 0); + ret = cpdma_chan_submit(cpsw->rxv[ch].ch, skb, + skb->data, skb_tailroom(skb), + 0); if (ret < 0) { cpsw_err(priv, ifup, "cannot submit skb to channel %d rx, error %d\n", @@ -1405,6 +1501,7 @@ 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); @@ -1474,7 +1571,7 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb, if (q_idx >= cpsw->tx_ch_num) q_idx = q_idx % cpsw->tx_ch_num; - txch = cpsw->txch[q_idx]; + txch = cpsw->txv[q_idx].ch; ret = cpsw_tx_packet_submit(priv, skb, txch); if (unlikely(ret != 0)) { cpsw_err(priv, tx_err, "desc submit failed\n"); @@ -1681,8 +1778,8 @@ static void cpsw_ndo_tx_timeout(struct net_device *ndev) ndev->stats.tx_errors++; cpsw_intr_disable(cpsw); for (ch = 0; ch < cpsw->tx_ch_num; ch++) { - cpdma_chan_stop(cpsw->txch[ch]); - cpdma_chan_start(cpsw->txch[ch]); + cpdma_chan_stop(cpsw->txv[ch].ch); + cpdma_chan_start(cpsw->txv[ch].ch); } cpsw_intr_enable(cpsw); @@ -1887,7 +1984,6 @@ static int cpsw_ndo_set_tx_maxrate(struct net_device *ndev, int queue, u32 rate) ch_rate = rate; else ch_rate = netdev_get_tx_queue(ndev, i)->tx_maxrate; - if (!ch_rate) continue; @@ -1935,9 +2031,12 @@ static int cpsw_ndo_set_tx_maxrate(struct net_device *ndev, int queue, u32 rate) max_rate = consumed_rate; weight = (rate * 100) / (max_rate * 1000); - cpdma_chan_set_weight(cpsw->txch[queue], weight); + cpdma_chan_set_weight(cpsw->txv[queue].ch, weight); + ret = cpdma_chan_set_rate(cpsw->txv[queue].ch, rate); - ret = cpdma_chan_set_rate(cpsw->txch[queue], rate); + /* re-split budget between channels */ + if (!rate) + cpsw_split_budget(ndev); pm_runtime_put(cpsw->dev); return ret; } @@ -2172,30 +2271,30 @@ static int cpsw_update_channels_res(struct cpsw_priv *priv, int ch_num, int rx) struct cpsw_common *cpsw = priv->cpsw; void (*handler)(void *, int, int); struct netdev_queue *queue; - struct cpdma_chan **chan; + struct cpsw_vector *vec; int ret, *ch; if (rx) { ch = &cpsw->rx_ch_num; - chan = cpsw->rxch; + vec = cpsw->rxv; handler = cpsw_rx_handler; poll = cpsw_rx_poll; } else { ch = &cpsw->tx_ch_num; - chan = cpsw->txch; + vec = cpsw->txv; handler = cpsw_tx_handler; poll = cpsw_tx_poll; } while (*ch < ch_num) { - chan[*ch] = cpdma_chan_create(cpsw->dma, *ch, handler, rx); + vec[*ch].ch = cpdma_chan_create(cpsw->dma, *ch, handler, rx); queue = netdev_get_tx_queue(priv->ndev, *ch); queue->tx_maxrate = 0; - if (IS_ERR(chan[*ch])) - return PTR_ERR(chan[*ch]); + if (IS_ERR(vec[*ch].ch)) + return PTR_ERR(vec[*ch].ch); - if (!chan[*ch]) + if (!vec[*ch].ch) return -EINVAL; cpsw_info(priv, ifup, "created new %d %s channel\n", *ch, @@ -2206,7 +2305,7 @@ static int cpsw_update_channels_res(struct cpsw_priv *priv, int ch_num, int rx) while (*ch > ch_num) { (*ch)--; - ret = cpdma_chan_destroy(chan[*ch]); + ret = cpdma_chan_destroy(vec[*ch].ch); if (ret) return ret; @@ -2293,6 +2392,8 @@ static int cpsw_set_channels(struct net_device *ndev, if (ret) goto err; + cpsw_split_budget(ndev); + /* After this receive is started */ cpdma_ctlr_start(cpsw->dma); cpsw_intr_enable(cpsw); @@ -2835,9 +2936,9 @@ static int cpsw_probe(struct platform_device *pdev) goto clean_dt_ret; } - cpsw->txch[0] = cpdma_chan_create(cpsw->dma, 0, cpsw_tx_handler, 0); - cpsw->rxch[0] = cpdma_chan_create(cpsw->dma, 0, cpsw_rx_handler, 1); - if (WARN_ON(!cpsw->rxch[0] || !cpsw->txch[0])) { + cpsw->txv[0].ch = cpdma_chan_create(cpsw->dma, 0, cpsw_tx_handler, 0); + cpsw->rxv[0].ch = cpdma_chan_create(cpsw->dma, 0, cpsw_rx_handler, 1); + if (WARN_ON(!cpsw->rxv[0].ch || !cpsw->txv[0].ch)) { dev_err(priv->dev, "error initializing dma channels\n"); ret = -ENOMEM; goto clean_dma_ret; -- 2.7.4