kernel: add missing memory barrier to bgmac

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45398 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/generic/patches-3.18/077-07-bgmac-fix-DMA-rx-corruption.patch b/target/linux/generic/patches-3.18/077-07-bgmac-fix-DMA-rx-corruption.patch
index 55e8033..5cf34e5 100644 (file)
--- a/target/linux/generic/patches-3.18/077-07-bgmac-fix-DMA-rx-corruption.patch
+++ b/target/linux/generic/patches-3.18/077-07-bgmac-fix-DMA-rx-corruption.patch
@@ -17,20 +17,33 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
 
 --- a/drivers/net/ethernet/broadcom/bgmac.c
 +++ b/drivers/net/ethernet/broadcom/bgmac.c
-@@ -380,6 +380,12 @@ static void bgmac_dma_rx_setup_desc(stru
+@@ -362,6 +362,16 @@ static int bgmac_dma_rx_skb_for_slot(str
+       return 0;
+ }
+ 
++static void bgmac_dma_rx_update_index(struct bgmac *bgmac,
++                                    struct bgmac_dma_ring *ring)
++{
++      wmb();
++
++      bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
++                  ring->index_base +
++                  ring->end * sizeof(struct bgmac_dma_desc));
++}
++
+ static void bgmac_dma_rx_setup_desc(struct bgmac *bgmac,
+                                   struct bgmac_dma_ring *ring, int desc_idx)
+ {
+@@ -380,6 +390,8 @@ static void bgmac_dma_rx_setup_desc(stru
        dma_desc->addr_high = cpu_to_le32(upper_32_bits(ring->slots[desc_idx].dma_addr));
        dma_desc->ctl0 = cpu_to_le32(ctl0);
        dma_desc->ctl1 = cpu_to_le32(ctl1);
 +
-+      desc_idx = (desc_idx + 1) % BGMAC_RX_RING_SLOTS;
-+
-+      bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
-+                      ring->index_base +
-+                      desc_idx * sizeof(struct bgmac_dma_desc));
++      ring->end = (desc_idx + 1) % BGMAC_RX_RING_SLOTS;
  }
  
  static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
-@@ -394,9 +400,7 @@ static int bgmac_dma_rx_read(struct bgma
+@@ -394,9 +406,7 @@ static int bgmac_dma_rx_read(struct bgma
        end_slot &= BGMAC_DMA_RX_STATDPTR;
        end_slot /= sizeof(struct bgmac_dma_desc);
  
@@ -41,7 +54,21 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
                struct device *dma_dev = bgmac->core->dma_dev;
                struct bgmac_slot_info *slot = &ring->slots[ring->start];
                struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
-@@ -693,10 +697,6 @@ static void bgmac_dma_init(struct bgmac 
+@@ -468,6 +478,8 @@ static int bgmac_dma_rx_read(struct bgma
+                       break;
+       }
+ 
++      bgmac_dma_rx_update_index(bgmac, ring);
++
+       return handled;
+ }
+ 
+@@ -690,15 +702,12 @@ static void bgmac_dma_init(struct bgmac 
+               if (ring->unaligned)
+                       bgmac_dma_rx_enable(bgmac, ring);
+ 
++              ring->start = 0;
++              ring->end = 0;
                for (j = 0; j < ring->num_slots; j++)
                        bgmac_dma_rx_setup_desc(bgmac, ring, j);
  
@@ -49,6 +76,9 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
 -                          ring->index_base +
 -                          ring->num_slots * sizeof(struct bgmac_dma_desc));
 -
-               ring->start = 0;
-               ring->end = 0;
+-              ring->start = 0;
+-              ring->end = 0;
++              bgmac_dma_rx_update_index(bgmac, ring);
        }
+ }
+