diff options
Diffstat (limited to 'target/linux/generic/patches-3.6')
| -rw-r--r-- | target/linux/generic/patches-3.6/065-8139cp-fixes.patch | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.6/065-8139cp-fixes.patch b/target/linux/generic/patches-3.6/065-8139cp-fixes.patch new file mode 100644 index 0000000000..f0087bfee3 --- /dev/null +++ b/target/linux/generic/patches-3.6/065-8139cp-fixes.patch @@ -0,0 +1,176 @@ +commit 01ffc0a7f1c1801a2354719dedbc32aff45b987d +Author: David Woodhouse <dwmw2@infradead.org> +Date: Sat Nov 24 12:11:21 2012 +0000 + + 8139cp: re-enable interrupts after tx timeout + + Recovery doesn't work too well if we leave interrupts disabled... + + Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> + Acked-by: Francois Romieu <romieu@fr.zoreil.com> + Signed-off-by: David S. Miller <davem@davemloft.net> + +commit 871f0d4c153e1258d4becf306eca6761bf38b629 +Author: David Woodhouse <dwmw2@infradead.org> +Date: Thu Nov 22 03:16:58 2012 +0000 + + 8139cp: enable bql + + This adds support for byte queue limits on RTL8139C+ + + Tested on real hardware. + + Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> + Acked-By: Dave Täht <dave.taht@bufferbloat.net> + Signed-off-by: David S. Miller <davem@davemloft.net> + +commit a9dbe40fc10cea2efe6e1ff9e03c62dd7579c5ba +Author: David Woodhouse <dwmw2@infradead.org> +Date: Wed Nov 21 10:27:19 2012 +0000 + + 8139cp: set ring address after enabling C+ mode + + This fixes (for me) a regression introduced by commit b01af457 ("8139cp: + set ring address before enabling receiver"). That commit configured the + descriptor ring addresses earlier in the initialisation sequence, in + order to avoid the possibility of triggering stray DMA before the + correct address had been set up. + + Unfortunately, it seems that the hardware will scribble garbage into the + TxRingAddr registers when we enable "plus mode" Tx in the CpCmd + register. Observed on a Traverse Geos router board. + + To deal with this, while not reintroducing the problem which led to the + original commit, we augment cp_start_hw() to write to the CpCmd register + *first*, then set the descriptor ring addresses, and then finally to + enable Rx and Tx in the original 8139 Cmd register. The datasheet + actually indicates that we should enable Tx/Rx in the Cmd register + *before* configuring the descriptor addresses, but that would appear to + re-introduce the problem that the offending commit b01af457 was trying + to solve. And this variant appears to work fine on real hardware. + + Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> + Cc: stable@kernel.org [3.5+] + Signed-off-by: David S. Miller <davem@davemloft.net> + +diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c +index 1c81825..6cb96b4 100644 +--- a/drivers/net/ethernet/realtek/8139cp.c ++++ b/drivers/net/ethernet/realtek/8139cp.c +@@ -648,6 +648,7 @@ static void cp_tx (struct cp_private *cp) + { + unsigned tx_head = cp->tx_head; + unsigned tx_tail = cp->tx_tail; ++ unsigned bytes_compl = 0, pkts_compl = 0; + + while (tx_tail != tx_head) { + struct cp_desc *txd = cp->tx_ring + tx_tail; +@@ -666,6 +667,9 @@ static void cp_tx (struct cp_private *cp) + le32_to_cpu(txd->opts1) & 0xffff, + PCI_DMA_TODEVICE); + ++ bytes_compl += skb->len; ++ pkts_compl++; ++ + if (status & LastFrag) { + if (status & (TxError | TxFIFOUnder)) { + netif_dbg(cp, tx_err, cp->dev, +@@ -697,6 +701,7 @@ static void cp_tx (struct cp_private *cp) + + cp->tx_tail = tx_tail; + ++ netdev_completed_queue(cp->dev, pkts_compl, bytes_compl); + if (TX_BUFFS_AVAIL(cp) > (MAX_SKB_FRAGS + 1)) + netif_wake_queue(cp->dev); + } +@@ -843,6 +848,8 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb, + wmb(); + } + cp->tx_head = entry; ++ ++ netdev_sent_queue(dev, skb->len); + netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n", + entry, skb->len); + if (TX_BUFFS_AVAIL(cp) <= (MAX_SKB_FRAGS + 1)) +@@ -937,6 +944,8 @@ static void cp_stop_hw (struct cp_private *cp) + + cp->rx_tail = 0; + cp->tx_head = cp->tx_tail = 0; ++ ++ netdev_reset_queue(cp->dev); + } + + static void cp_reset_hw (struct cp_private *cp) +@@ -957,8 +966,38 @@ static void cp_reset_hw (struct cp_private *cp) + + static inline void cp_start_hw (struct cp_private *cp) + { ++ dma_addr_t ring_dma; ++ + cpw16(CpCmd, cp->cpcmd); ++ ++ /* ++ * These (at least TxRingAddr) need to be configured after the ++ * corresponding bits in CpCmd are enabled. Datasheet v1.6 §6.33 ++ * (C+ Command Register) recommends that these and more be configured ++ * *after* the [RT]xEnable bits in CpCmd are set. And on some hardware ++ * it's been observed that the TxRingAddr is actually reset to garbage ++ * when C+ mode Tx is enabled in CpCmd. ++ */ ++ cpw32_f(HiTxRingAddr, 0); ++ cpw32_f(HiTxRingAddr + 4, 0); ++ ++ ring_dma = cp->ring_dma; ++ cpw32_f(RxRingAddr, ring_dma & 0xffffffff); ++ cpw32_f(RxRingAddr + 4, (ring_dma >> 16) >> 16); ++ ++ ring_dma += sizeof(struct cp_desc) * CP_RX_RING_SIZE; ++ cpw32_f(TxRingAddr, ring_dma & 0xffffffff); ++ cpw32_f(TxRingAddr + 4, (ring_dma >> 16) >> 16); ++ ++ /* ++ * Strictly speaking, the datasheet says this should be enabled ++ * *before* setting the descriptor addresses. But what, then, would ++ * prevent it from doing DMA to random unconfigured addresses? ++ * This variant appears to work fine. ++ */ + cpw8(Cmd, RxOn | TxOn); ++ ++ netdev_reset_queue(cp->dev); + } + + static void cp_enable_irq(struct cp_private *cp) +@@ -969,7 +1008,6 @@ static void cp_enable_irq(struct cp_private *cp) + static void cp_init_hw (struct cp_private *cp) + { + struct net_device *dev = cp->dev; +- dma_addr_t ring_dma; + + cp_reset_hw(cp); + +@@ -979,17 +1017,6 @@ static void cp_init_hw (struct cp_private *cp) + cpw32_f (MAC0 + 0, le32_to_cpu (*(__le32 *) (dev->dev_addr + 0))); + cpw32_f (MAC0 + 4, le32_to_cpu (*(__le32 *) (dev->dev_addr + 4))); + +- cpw32_f(HiTxRingAddr, 0); +- cpw32_f(HiTxRingAddr + 4, 0); +- +- ring_dma = cp->ring_dma; +- cpw32_f(RxRingAddr, ring_dma & 0xffffffff); +- cpw32_f(RxRingAddr + 4, (ring_dma >> 16) >> 16); +- +- ring_dma += sizeof(struct cp_desc) * CP_RX_RING_SIZE; +- cpw32_f(TxRingAddr, ring_dma & 0xffffffff); +- cpw32_f(TxRingAddr + 4, (ring_dma >> 16) >> 16); +- + cp_start_hw(cp); + cpw8(TxThresh, 0x06); /* XXX convert magic num to a constant */ + +@@ -1192,6 +1219,7 @@ static void cp_tx_timeout(struct net_device *dev) + cp_clean_rings(cp); + rc = cp_init_rings(cp); + cp_start_hw(cp); ++ cp_enable_irq(cp); + + netif_wake_queue(dev); + |