From a21bb8bae1057ecd071f6d43b9ee3f97503ad904 Mon Sep 17 00:00:00 2001 From: =?utf8?q?fran=C3=A7ois=20romieu?= Date: Fri, 1 May 2015 22:14:39 +0200 Subject: [PATCH] via-rhine: allocate and map receive buffer in a single transaction It's used to initialize the receive ring but it will actually shine when the receive poll code is reworked. Signed-off-by: Francois Romieu Signed-off-by: David S. Miller --- drivers/net/ethernet/via/via-rhine.c | 57 +++++++++++++++++++++++++++--------- 1 file changed, 43 insertions(+), 14 deletions(-) diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c index 88b45c7..aa398ea 100644 --- a/drivers/net/ethernet/via/via-rhine.c +++ b/drivers/net/ethernet/via/via-rhine.c @@ -1213,12 +1213,47 @@ static void free_ring(struct net_device* dev) } -static void alloc_rbufs(struct net_device *dev) +struct rhine_skb_dma { + struct sk_buff *skb; + dma_addr_t dma; +}; + +static inline int rhine_skb_dma_init(struct net_device *dev, + struct rhine_skb_dma *sd) { struct rhine_private *rp = netdev_priv(dev); struct device *hwdev = dev->dev.parent; + const int size = rp->rx_buf_sz; + + sd->skb = netdev_alloc_skb(dev, size); + if (!sd->skb) + return -ENOMEM; + + sd->dma = dma_map_single(hwdev, sd->skb->data, size, DMA_FROM_DEVICE); + if (unlikely(dma_mapping_error(hwdev, sd->dma))) { + netif_err(rp, drv, dev, "Rx DMA mapping failure\n"); + dev_kfree_skb_any(sd->skb); + return -EIO; + } + + return 0; +} + +static inline void rhine_skb_dma_nic_store(struct rhine_private *rp, + struct rhine_skb_dma *sd, int entry) +{ + rp->rx_skbuff_dma[entry] = sd->dma; + rp->rx_skbuff[entry] = sd->skb; + + rp->rx_ring[entry].addr = cpu_to_le32(sd->dma); + dma_wmb(); +} + +static void alloc_rbufs(struct net_device *dev) +{ + struct rhine_private *rp = netdev_priv(dev); dma_addr_t next; - int i; + int rc, i; rp->dirty_rx = rp->cur_rx = 0; @@ -1239,20 +1274,14 @@ static void alloc_rbufs(struct net_device *dev) /* Fill in the Rx buffers. Handle allocation failure gracefully. */ for (i = 0; i < RX_RING_SIZE; i++) { - struct sk_buff *skb = netdev_alloc_skb(dev, rp->rx_buf_sz); - rp->rx_skbuff[i] = skb; - if (skb == NULL) - break; + struct rhine_skb_dma sd; - rp->rx_skbuff_dma[i] = - dma_map_single(hwdev, skb->data, rp->rx_buf_sz, - DMA_FROM_DEVICE); - if (dma_mapping_error(hwdev, rp->rx_skbuff_dma[i])) { - rp->rx_skbuff_dma[i] = 0; - dev_kfree_skb(skb); + rc = rhine_skb_dma_init(dev, &sd); + if (rc < 0) break; - } - rp->rx_ring[i].addr = cpu_to_le32(rp->rx_skbuff_dma[i]); + + rhine_skb_dma_nic_store(rp, &sd, i); + rp->rx_ring[i].rx_status = cpu_to_le32(DescOwn); } rp->dirty_rx = (unsigned int)(i - RX_RING_SIZE); -- 2.7.4