[PATCH] arc_emac: fix compile-time errors & warnings on PPC64
From: Alexey Brodkin <hidden>
Date: 2013-06-26 07:49:48
Also in:
linux-devicetree, lkml
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
As reported by "kbuild test robot" there were some errors and warnings on attempt to build kernel with "make ARCH=powerpc allmodconfig". And this patch addresses both errors and warnings. Below is a list of introduced changes: 1. Fix compile-time errors (misspellings in "dma_unmap_single") on PPC. 2. Use DMA address instead of "skb->data" as a pointer to data buffer. This fixed warnings on pointer to int conversion on 64-bit systems. 3. Re-implemented initial allocation of Rx buffers in "arc_emac_open" in the same way they're re-allocated during operation (receiving packets). So once again DMA address could be used instead of "skb->data". 4. Explicitly use EMAC_BUFFER_SIZE for Rx buffers allocation. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: netdev@vger.kernel.org Cc: Andy Shevchenko <redacted> Cc: Francois Romieu <romieu@fr.zoreil.com> Cc: Joe Perches <joe@perches.com> Cc: Vineet Gupta <redacted> Cc: Mischa Jonker <redacted> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <redacted> Cc: Rob Herring <redacted> Cc: Paul Gortmaker <redacted> Cc: linux-kernel@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org Cc: Florian Fainelli <florian@openwrt.org> Cc: David Laight <redacted> --- drivers/net/ethernet/arc/emac_main.c | 65 ++++++++++++++++++++-------------- 1 file changed, 39 insertions(+), 26 deletions(-)
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index 20345f6..f1b121e 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c@@ -171,8 +171,8 @@ static void arc_emac_tx_clean(struct net_device *ndev) stats->tx_bytes += skb->len; } - dma_unmap_single(&ndev->dev, dma_unmap_addr(&tx_buff, addr), - dma_unmap_len(&tx_buff, len), DMA_TO_DEVICE); + dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), + dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); /* return the sk_buff to system */ dev_kfree_skb_irq(skb);
@@ -204,7 +204,6 @@ static int arc_emac_rx(struct net_device *ndev, int budget) struct net_device_stats *stats = &priv->stats; struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; - unsigned int buflen = EMAC_BUFFER_SIZE; unsigned int pktlen, info = le32_to_cpu(rxbd->info); struct sk_buff *skb; dma_addr_t addr;
@@ -226,7 +225,7 @@ static int arc_emac_rx(struct net_device *ndev, int budget) netdev_err(ndev, "incomplete packet received\n"); /* Return ownership to EMAC */ - rxbd->info = cpu_to_le32(FOR_EMAC | buflen); + rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); stats->rx_errors++; stats->rx_length_errors++; continue;
@@ -240,11 +239,12 @@ static int arc_emac_rx(struct net_device *ndev, int budget) skb->dev = ndev; skb->protocol = eth_type_trans(skb, ndev); - dma_unmap_single(&ndev->dev, dma_unmap_addr(&rx_buff, addr), - dma_unmap_len(&rx_buff, len), DMA_FROM_DEVICE); + dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), + dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); /* Prepare the BD for next cycle */ - rx_buff->skb = netdev_alloc_skb_ip_align(ndev, buflen); + rx_buff->skb = netdev_alloc_skb_ip_align(ndev, + EMAC_BUFFER_SIZE); if (unlikely(!rx_buff->skb)) { stats->rx_errors++; /* Because receive_skb is below, increment rx_dropped */
@@ -256,7 +256,7 @@ static int arc_emac_rx(struct net_device *ndev, int budget) netif_receive_skb(skb); addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, - buflen, DMA_FROM_DEVICE); + EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); if (dma_mapping_error(&ndev->dev, addr)) { if (net_ratelimit()) netdev_err(ndev, "cannot dma map\n");
@@ -264,16 +264,16 @@ static int arc_emac_rx(struct net_device *ndev, int budget) stats->rx_errors++; continue; } - dma_unmap_addr_set(&rx_buff, mapping, addr); - dma_unmap_len_set(&rx_buff, len, buflen); + dma_unmap_addr_set(rx_buff, addr, addr); + dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); - rxbd->data = cpu_to_le32(rx_buff->skb->data); + rxbd->data = cpu_to_le32(addr); /* Make sure pointer to data buffer is set */ wmb(); /* Return ownership to EMAC */ - rxbd->info = cpu_to_le32(FOR_EMAC | buflen); + rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); } return work_done;
@@ -376,8 +376,6 @@ static int arc_emac_open(struct net_device *ndev) { struct arc_emac_priv *priv = netdev_priv(ndev); struct phy_device *phy_dev = priv->phy_dev; - struct arc_emac_bd *bd; - struct sk_buff *skb; int i; phy_dev->autoneg = AUTONEG_ENABLE;
@@ -395,25 +393,40 @@ static int arc_emac_open(struct net_device *ndev) } } + priv->last_rx_bd = 0; + /* Allocate and set buffers for Rx BD's */ - bd = priv->rxbd; for (i = 0; i < RX_BD_NUM; i++) { - skb = netdev_alloc_skb_ip_align(ndev, EMAC_BUFFER_SIZE); - if (unlikely(!skb)) + dma_addr_t addr; + unsigned int *last_rx_bd = &priv->last_rx_bd; + struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; + struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; + + rx_buff->skb = netdev_alloc_skb_ip_align(ndev, + EMAC_BUFFER_SIZE); + if (unlikely(!rx_buff->skb)) + return -ENOMEM; + + addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, + EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(&ndev->dev, addr)) { + netdev_err(ndev, "cannot dma map\n"); + dev_kfree_skb(rx_buff->skb); return -ENOMEM; + } + dma_unmap_addr_set(rx_buff, addr, addr); + dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); - priv->rx_buff[i].skb = skb; - bd->data = cpu_to_le32(skb->data); + rxbd->data = cpu_to_le32(addr); /* Make sure pointer to data buffer is set */ wmb(); - /* Set ownership to EMAC */ - bd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); - bd++; - } + /* Return ownership to EMAC */ + rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); - priv->last_rx_bd = 0; + *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; + } /* Clean Tx BD's */ memset(priv->txbd, 0, TX_RING_SZ);
@@ -543,11 +556,11 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) dev_kfree_skb(skb); return NETDEV_TX_OK; } - dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], mapping, addr); + dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); priv->tx_buff[*txbd_curr].skb = skb; - priv->txbd[*txbd_curr].data = cpu_to_le32(skb->data); + priv->txbd[*txbd_curr].data = cpu_to_le32(addr); /* Make sure pointer to data buffer is set */ wmb();
--
1.7.10.4