target/linux/rb532/patches-2.6.27/010-korina_rework_korina_rx.patch

   1 This function needs an early exit condition to function properly, or
   2 else caller assumes napi workload wasn't enough to handle all received
   3 packets and korina_rx is called again (and again and again and ...).
   4
   5 Signed-off-by: Phil Sutter <n0-1@freewrt.org>
   6 ---
   7 --- a/drivers/net/korina.c      2009-01-19 23:19:10.000000000 +0100
   8 +++ b/drivers/net/korina.c      2009-01-19 23:25:31.000000000 +0100
   9 @@ -353,15 +353,20 @@
  10         struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
  11         struct sk_buff *skb, *skb_new;
  12         u8 *pkt_buf;
  13 -       u32 devcs, pkt_len, dmas, rx_free_desc;
  14 +       u32 devcs, pkt_len, dmas;
  15         int count;
  16
  17         dma_cache_inv((u32)rd, sizeof(*rd));
  18
  19         for (count = 0; count < limit; count++) {
  20 +               skb = lp->rx_skb[lp->rx_next_done];
  21 +               skb_new = NULL;
  22
  23                 devcs = rd->devcs;
  24
  25 +               if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
  26 +                       break;
  27 +
  28                 /* Update statistics counters */
  29                 if (devcs & ETH_RX_CRC)
  30                         dev->stats.rx_crc_errors++;
  31 @@ -384,64 +389,53 @@
  32                          * in Rc32434 (errata ref #077) */
  33                         dev->stats.rx_errors++;
  34                         dev->stats.rx_dropped++;
  35 -               }
  36 -
  37 -               while ((rx_free_desc = KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) != 0) {
  38 -                       /* init the var. used for the later
  39 -                        * operations within the while loop */
  40 -                       skb_new = NULL;
  41 +               } else if ((devcs & ETH_RX_ROK)) {
  42                         pkt_len = RCVPKT_LENGTH(devcs);
  43 -                       skb = lp->rx_skb[lp->rx_next_done];
  44 +                       /* must be the (first and) last
  45 +                        * descriptor then */
  46 +                       pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
  47 +
  48 +                       /* invalidate the cache */
  49 +                       dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
  50 +
  51 +                       /* Malloc up new buffer. */
  52 +                       skb_new = netdev_alloc_skb(dev, KORINA_RBSIZE + 2);
  53 +
  54 +                       if (!skb_new)
  55 +                               break;
  56 +                       /* Do not count the CRC */
  57 +                       skb_put(skb, pkt_len - 4);
  58 +                       skb->protocol = eth_type_trans(skb, dev);
  59 +
  60 +                       /* Pass the packet to upper layers */
  61 +                       netif_receive_skb(skb);
  62 +                       dev->stats.rx_packets++;
  63 +                       dev->stats.rx_bytes += pkt_len;
  64 +
  65 +                       /* Update the mcast stats */
  66 +                       if (devcs & ETH_RX_MP)
  67 +                               dev->stats.multicast++;
  68
  69 -                       if ((devcs & ETH_RX_ROK)) {
  70 -                               /* must be the (first and) last
  71 -                                * descriptor then */
  72 -                               pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
  73 -
  74 -                               /* invalidate the cache */
  75 -                               dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
  76 -
  77 -                               /* Malloc up new buffer. */
  78 -                               skb_new = netdev_alloc_skb(dev, KORINA_RBSIZE + 2);
  79 -
  80 -                               if (!skb_new)
  81 -                                       break;
  82 -                               /* Do not count the CRC */
  83 -                               skb_put(skb, pkt_len - 4);
  84 -                               skb->protocol = eth_type_trans(skb, dev);
  85 -
  86 -                               /* Pass the packet to upper layers */
  87 -                               netif_receive_skb(skb);
  88 -                               dev->last_rx = jiffies;
  89 -                               dev->stats.rx_packets++;
  90 -                               dev->stats.rx_bytes += pkt_len;
  91 -
  92 -                               /* Update the mcast stats */
  93 -                               if (devcs & ETH_RX_MP)
  94 -                                       dev->stats.multicast++;
  95 -
  96 -                               lp->rx_skb[lp->rx_next_done] = skb_new;
  97 -                       }
  98 -
  99 -                       rd->devcs = 0;
 100 -
 101 -                       /* Restore descriptor's curr_addr */
 102 -                       if (skb_new)
 103 -                               rd->ca = CPHYSADDR(skb_new->data);
 104 -                       else
 105 -                               rd->ca = CPHYSADDR(skb->data);
 106 +                       lp->rx_skb[lp->rx_next_done] = skb_new;
 107 +               }
 108 +               rd->devcs = 0;
 109 +
 110 +               /* Restore descriptor's curr_addr */
 111 +               if (skb_new)
 112 +                       rd->ca = CPHYSADDR(skb_new->data);
 113 +               else
 114 +                       rd->ca = CPHYSADDR(skb->data);
 115
 116 -                       rd->control = DMA_COUNT(KORINA_RBSIZE) |
 117 +               rd->control = DMA_COUNT(KORINA_RBSIZE) |
 118                                 DMA_DESC_COD | DMA_DESC_IOD;
 119 -                       lp->rd_ring[(lp->rx_next_done - 1) &
 120 -                               KORINA_RDS_MASK].control &=
 121 -                               ~DMA_DESC_COD;
 122 -
 123 -                       lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
 124 -                       dma_cache_wback((u32)rd, sizeof(*rd));
 125 -                       rd = &lp->rd_ring[lp->rx_next_done];
 126 -                       writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
 127 -               }
 128 +               lp->rd_ring[(lp->rx_next_done - 1) &
 129 +                       KORINA_RDS_MASK].control &=
 130 +                       ~DMA_DESC_COD;
 131 +
 132 +               lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
 133 +               dma_cache_wback((u32)rd, sizeof(*rd));
 134 +               rd = &lp->rd_ring[lp->rx_next_done];
 135 +               writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
 136         }
 137
 138         dmas = readl(&lp->rx_dma_regs->dmas);