From 2f45d1902acfc7e6680cfeeb38922dcc7e16deb6 Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Sat, 25 Jul 2015 23:42:01 +0300 Subject: [PATCH] ravb: minimize TX data copying Renesas Ethernet AVB controller requires that all data are aligned on 4-byte boundary. While it's easily achievable for the RX data with the help of skb_reserve() (we even align on 128-byte boundary as recommended by the manual), we can't do the same with the TX data, and it always comes unaligned from the networking core. Originally we solved it an easy way, copying all packet to a preallocated aligned buffer; however, it's enough to copy only up to 3 first bytes from each packet, doing the transfer using 2 TX descriptors instead of just 1. Here's an implementation of the new TX algorithm that significantly reduces the driver's memory requirements. Signed-off-by: Sergei Shtylyov Signed-off-by: David S. Miller --- drivers/net/ethernet/renesas/ravb.h | 5 +- drivers/net/ethernet/renesas/ravb_main.c | 104 +++++++++++++---------- 2 files changed, 64 insertions(+), 45 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h index 8aa50ac4e2d6..a157aaaaff6a 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -658,6 +658,8 @@ struct ravb_desc { __le32 dptr; /* Descriptor pointer */ }; +#define DPTR_ALIGN 4 /* Required descriptor pointer alignment */ + enum DIE_DT { /* Frame data */ DT_FMID = 0x40, @@ -739,6 +741,7 @@ enum RAVB_QUEUE { #define RX_QUEUE_OFFSET 4 #define NUM_RX_QUEUE 2 #define NUM_TX_QUEUE 2 +#define NUM_TX_DESC 2 /* TX descriptors per packet */ struct ravb_tstamp_skb { struct list_head list; @@ -777,9 +780,9 @@ struct ravb_private { dma_addr_t tx_desc_dma[NUM_TX_QUEUE]; struct ravb_ex_rx_desc *rx_ring[NUM_RX_QUEUE]; struct ravb_tx_desc *tx_ring[NUM_TX_QUEUE]; + void *tx_align[NUM_TX_QUEUE]; struct sk_buff **rx_skb[NUM_RX_QUEUE]; struct sk_buff **tx_skb[NUM_TX_QUEUE]; - void **tx_buffers[NUM_TX_QUEUE]; u32 rx_over_errors; u32 rx_fifo_errors; struct net_device_stats stats[NUM_RX_QUEUE]; diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 779bb58a068e..3d972d819420 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -195,12 +195,8 @@ static void ravb_ring_free(struct net_device *ndev, int q) priv->tx_skb[q] = NULL; /* Free aligned TX buffers */ - if (priv->tx_buffers[q]) { - for (i = 0; i < priv->num_tx_ring[q]; i++) - kfree(priv->tx_buffers[q][i]); - } - kfree(priv->tx_buffers[q]); - priv->tx_buffers[q] = NULL; + kfree(priv->tx_align[q]); + priv->tx_align[q] = NULL; if (priv->rx_ring[q]) { ring_size = sizeof(struct ravb_ex_rx_desc) * @@ -212,7 +208,7 @@ static void ravb_ring_free(struct net_device *ndev, int q) if (priv->tx_ring[q]) { ring_size = sizeof(struct ravb_tx_desc) * - (priv->num_tx_ring[q] + 1); + (priv->num_tx_ring[q] * NUM_TX_DESC + 1); dma_free_coherent(NULL, ring_size, priv->tx_ring[q], priv->tx_desc_dma[q]); priv->tx_ring[q] = NULL; @@ -227,7 +223,8 @@ static void ravb_ring_format(struct net_device *ndev, int q) struct ravb_tx_desc *tx_desc; struct ravb_desc *desc; int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q]; - int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q]; + int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] * + NUM_TX_DESC; dma_addr_t dma_addr; int i; @@ -260,11 +257,12 @@ static void ravb_ring_format(struct net_device *ndev, int q) memset(priv->tx_ring[q], 0, tx_ring_size); /* Build TX ring buffer */ - for (i = 0; i < priv->num_tx_ring[q]; i++) { - tx_desc = &priv->tx_ring[q][i]; + for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q]; + i++, tx_desc++) { + tx_desc->die_dt = DT_EEMPTY; + tx_desc++; tx_desc->die_dt = DT_EEMPTY; } - tx_desc = &priv->tx_ring[q][i]; tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]); tx_desc->die_dt = DT_LINKFIX; /* type */ @@ -285,7 +283,6 @@ static int ravb_ring_init(struct net_device *ndev, int q) struct ravb_private *priv = netdev_priv(ndev); struct sk_buff *skb; int ring_size; - void *buffer; int i; /* Allocate RX and TX skb rings */ @@ -305,19 +302,11 @@ static int ravb_ring_init(struct net_device *ndev, int q) } /* Allocate rings for the aligned buffers */ - priv->tx_buffers[q] = kcalloc(priv->num_tx_ring[q], - sizeof(*priv->tx_buffers[q]), GFP_KERNEL); - if (!priv->tx_buffers[q]) + priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] + + DPTR_ALIGN - 1, GFP_KERNEL); + if (!priv->tx_align[q]) goto error; - for (i = 0; i < priv->num_tx_ring[q]; i++) { - buffer = kmalloc(PKT_BUF_SZ + RAVB_ALIGN - 1, GFP_KERNEL); - if (!buffer) - goto error; - /* Aligned TX buffer */ - priv->tx_buffers[q][i] = buffer; - } - /* Allocate all RX descriptors. */ ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1); priv->rx_ring[q] = dma_alloc_coherent(NULL, ring_size, @@ -329,7 +318,8 @@ static int ravb_ring_init(struct net_device *ndev, int q) priv->dirty_rx[q] = 0; /* Allocate all TX descriptors. */ - ring_size = sizeof(struct ravb_tx_desc) * (priv->num_tx_ring[q] + 1); + ring_size = sizeof(struct ravb_tx_desc) * + (priv->num_tx_ring[q] * NUM_TX_DESC + 1); priv->tx_ring[q] = dma_alloc_coherent(NULL, ring_size, &priv->tx_desc_dma[q], GFP_KERNEL); @@ -443,7 +433,8 @@ static int ravb_tx_free(struct net_device *ndev, int q) u32 size; for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) { - entry = priv->dirty_tx[q] % priv->num_tx_ring[q]; + entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] * + NUM_TX_DESC); desc = &priv->tx_ring[q][entry]; if (desc->die_dt != DT_FEMPTY) break; @@ -451,14 +442,18 @@ static int ravb_tx_free(struct net_device *ndev, int q) dma_rmb(); size = le16_to_cpu(desc->ds_tagl) & TX_DS; /* Free the original skb. */ - if (priv->tx_skb[q][entry]) { + if (priv->tx_skb[q][entry / NUM_TX_DESC]) { dma_unmap_single(&ndev->dev, le32_to_cpu(desc->dptr), size, DMA_TO_DEVICE); - dev_kfree_skb_any(priv->tx_skb[q][entry]); - priv->tx_skb[q][entry] = NULL; + /* Last packet descriptor? */ + if (entry % NUM_TX_DESC == NUM_TX_DESC - 1) { + entry /= NUM_TX_DESC; + dev_kfree_skb_any(priv->tx_skb[q][entry]); + priv->tx_skb[q][entry] = NULL; + stats->tx_packets++; + } free_num++; } - stats->tx_packets++; stats->tx_bytes += size; desc->die_dt = DT_EEMPTY; } @@ -1284,37 +1279,53 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) u32 dma_addr; void *buffer; u32 entry; + u32 len; spin_lock_irqsave(&priv->lock, flags); - if (priv->cur_tx[q] - priv->dirty_tx[q] >= priv->num_tx_ring[q]) { + if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) * + NUM_TX_DESC) { netif_err(priv, tx_queued, ndev, "still transmitting with the full ring!\n"); netif_stop_subqueue(ndev, q); spin_unlock_irqrestore(&priv->lock, flags); return NETDEV_TX_BUSY; } - entry = priv->cur_tx[q] % priv->num_tx_ring[q]; - priv->tx_skb[q][entry] = skb; + entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * NUM_TX_DESC); + priv->tx_skb[q][entry / NUM_TX_DESC] = skb; if (skb_put_padto(skb, ETH_ZLEN)) goto drop; - buffer = PTR_ALIGN(priv->tx_buffers[q][entry], RAVB_ALIGN); - memcpy(buffer, skb->data, skb->len); - desc = &priv->tx_ring[q][entry]; - desc->ds_tagl = cpu_to_le16(skb->len); - dma_addr = dma_map_single(&ndev->dev, buffer, skb->len, DMA_TO_DEVICE); + buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) + + entry / NUM_TX_DESC * DPTR_ALIGN; + len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data; + memcpy(buffer, skb->data, len); + dma_addr = dma_map_single(&ndev->dev, buffer, len, DMA_TO_DEVICE); if (dma_mapping_error(&ndev->dev, dma_addr)) goto drop; + + desc = &priv->tx_ring[q][entry]; + desc->ds_tagl = cpu_to_le16(len); + desc->dptr = cpu_to_le32(dma_addr); + + buffer = skb->data + len; + len = skb->len - len; + dma_addr = dma_map_single(&ndev->dev, buffer, len, DMA_TO_DEVICE); + if (dma_mapping_error(&ndev->dev, dma_addr)) + goto unmap; + + desc++; + desc->ds_tagl = cpu_to_le16(len); desc->dptr = cpu_to_le32(dma_addr); /* TX timestamp required */ if (q == RAVB_NC) { ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC); if (!ts_skb) { - dma_unmap_single(&ndev->dev, dma_addr, skb->len, + desc--; + dma_unmap_single(&ndev->dev, dma_addr, len, DMA_TO_DEVICE); - goto drop; + goto unmap; } ts_skb->skb = skb; ts_skb->tag = priv->ts_skb_tag++; @@ -1330,13 +1341,15 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) /* Descriptor type must be set after all the above writes */ dma_wmb(); - desc->die_dt = DT_FSINGLE; + desc->die_dt = DT_FEND; + desc--; + desc->die_dt = DT_FSTART; ravb_write(ndev, ravb_read(ndev, TCCR) | (TCCR_TSRQ0 << q), TCCR); - priv->cur_tx[q]++; - if (priv->cur_tx[q] - priv->dirty_tx[q] >= priv->num_tx_ring[q] && - !ravb_tx_free(ndev, q)) + priv->cur_tx[q] += NUM_TX_DESC; + if (priv->cur_tx[q] - priv->dirty_tx[q] > + (priv->num_tx_ring[q] - 1) * NUM_TX_DESC && !ravb_tx_free(ndev, q)) netif_stop_subqueue(ndev, q); exit: @@ -1344,9 +1357,12 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) spin_unlock_irqrestore(&priv->lock, flags); return NETDEV_TX_OK; +unmap: + dma_unmap_single(&ndev->dev, le32_to_cpu(desc->dptr), + le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE); drop: dev_kfree_skb_any(skb); - priv->tx_skb[q][entry] = NULL; + priv->tx_skb[q][entry / NUM_TX_DESC] = NULL; goto exit; } -- GitLab