175 lines
5.7 KiB
Diff
175 lines
5.7 KiB
Diff
commit 01ffc0a7f1c1801a2354719dedbc32aff45b987d
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Author: David Woodhouse <dwmw2@infradead.org>
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Date: Sat Nov 24 12:11:21 2012 +0000
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8139cp: re-enable interrupts after tx timeout
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Recovery doesn't work too well if we leave interrupts disabled...
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Acked-by: Francois Romieu <romieu@fr.zoreil.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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commit 871f0d4c153e1258d4becf306eca6761bf38b629
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Author: David Woodhouse <dwmw2@infradead.org>
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Date: Thu Nov 22 03:16:58 2012 +0000
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8139cp: enable bql
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This adds support for byte queue limits on RTL8139C+
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Tested on real hardware.
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Acked-By: Dave Täht <dave.taht@bufferbloat.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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commit a9dbe40fc10cea2efe6e1ff9e03c62dd7579c5ba
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Author: David Woodhouse <dwmw2@infradead.org>
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Date: Wed Nov 21 10:27:19 2012 +0000
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8139cp: set ring address after enabling C+ mode
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This fixes (for me) a regression introduced by commit b01af457 ("8139cp:
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set ring address before enabling receiver"). That commit configured the
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descriptor ring addresses earlier in the initialisation sequence, in
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order to avoid the possibility of triggering stray DMA before the
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correct address had been set up.
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Unfortunately, it seems that the hardware will scribble garbage into the
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TxRingAddr registers when we enable "plus mode" Tx in the CpCmd
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register. Observed on a Traverse Geos router board.
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To deal with this, while not reintroducing the problem which led to the
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original commit, we augment cp_start_hw() to write to the CpCmd register
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*first*, then set the descriptor ring addresses, and then finally to
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enable Rx and Tx in the original 8139 Cmd register. The datasheet
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actually indicates that we should enable Tx/Rx in the Cmd register
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*before* configuring the descriptor addresses, but that would appear to
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re-introduce the problem that the offending commit b01af457 was trying
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to solve. And this variant appears to work fine on real hardware.
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Cc: stable@kernel.org [3.5+]
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Signed-off-by: David S. Miller <davem@davemloft.net>
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--- a/drivers/net/ethernet/realtek/8139cp.c
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+++ b/drivers/net/ethernet/realtek/8139cp.c
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@@ -648,6 +648,7 @@ static void cp_tx (struct cp_private *cp
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{
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unsigned tx_head = cp->tx_head;
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unsigned tx_tail = cp->tx_tail;
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+ unsigned bytes_compl = 0, pkts_compl = 0;
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while (tx_tail != tx_head) {
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struct cp_desc *txd = cp->tx_ring + tx_tail;
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@@ -666,6 +667,9 @@ static void cp_tx (struct cp_private *cp
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le32_to_cpu(txd->opts1) & 0xffff,
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PCI_DMA_TODEVICE);
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+ bytes_compl += skb->len;
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+ pkts_compl++;
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+
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if (status & LastFrag) {
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if (status & (TxError | TxFIFOUnder)) {
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netif_dbg(cp, tx_err, cp->dev,
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@@ -697,6 +701,7 @@ static void cp_tx (struct cp_private *cp
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cp->tx_tail = tx_tail;
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+ netdev_completed_queue(cp->dev, pkts_compl, bytes_compl);
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if (TX_BUFFS_AVAIL(cp) > (MAX_SKB_FRAGS + 1))
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netif_wake_queue(cp->dev);
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}
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@@ -843,6 +848,8 @@ static netdev_tx_t cp_start_xmit (struct
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wmb();
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}
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cp->tx_head = entry;
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+
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+ netdev_sent_queue(dev, skb->len);
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netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n",
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entry, skb->len);
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if (TX_BUFFS_AVAIL(cp) <= (MAX_SKB_FRAGS + 1))
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@@ -937,6 +944,8 @@ static void cp_stop_hw (struct cp_privat
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cp->rx_tail = 0;
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cp->tx_head = cp->tx_tail = 0;
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+
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+ netdev_reset_queue(cp->dev);
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}
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static void cp_reset_hw (struct cp_private *cp)
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@@ -957,8 +966,38 @@ static void cp_reset_hw (struct cp_priva
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static inline void cp_start_hw (struct cp_private *cp)
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{
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+ dma_addr_t ring_dma;
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+
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cpw16(CpCmd, cp->cpcmd);
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+
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+ /*
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+ * These (at least TxRingAddr) need to be configured after the
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+ * corresponding bits in CpCmd are enabled. Datasheet v1.6 §6.33
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+ * (C+ Command Register) recommends that these and more be configured
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+ * *after* the [RT]xEnable bits in CpCmd are set. And on some hardware
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+ * it's been observed that the TxRingAddr is actually reset to garbage
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+ * when C+ mode Tx is enabled in CpCmd.
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+ */
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+ cpw32_f(HiTxRingAddr, 0);
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+ cpw32_f(HiTxRingAddr + 4, 0);
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+
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+ ring_dma = cp->ring_dma;
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+ cpw32_f(RxRingAddr, ring_dma & 0xffffffff);
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+ cpw32_f(RxRingAddr + 4, (ring_dma >> 16) >> 16);
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+
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+ ring_dma += sizeof(struct cp_desc) * CP_RX_RING_SIZE;
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+ cpw32_f(TxRingAddr, ring_dma & 0xffffffff);
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+ cpw32_f(TxRingAddr + 4, (ring_dma >> 16) >> 16);
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+
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+ /*
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+ * Strictly speaking, the datasheet says this should be enabled
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+ * *before* setting the descriptor addresses. But what, then, would
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+ * prevent it from doing DMA to random unconfigured addresses?
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+ * This variant appears to work fine.
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+ */
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cpw8(Cmd, RxOn | TxOn);
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+
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+ netdev_reset_queue(cp->dev);
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}
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static void cp_enable_irq(struct cp_private *cp)
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@@ -969,7 +1008,6 @@ static void cp_enable_irq(struct cp_priv
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static void cp_init_hw (struct cp_private *cp)
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{
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struct net_device *dev = cp->dev;
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- dma_addr_t ring_dma;
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cp_reset_hw(cp);
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@@ -992,17 +1030,6 @@ static void cp_init_hw (struct cp_privat
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cpw8(Config5, cpr8(Config5) & PMEStatus);
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- cpw32_f(HiTxRingAddr, 0);
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- cpw32_f(HiTxRingAddr + 4, 0);
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-
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- ring_dma = cp->ring_dma;
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- cpw32_f(RxRingAddr, ring_dma & 0xffffffff);
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- cpw32_f(RxRingAddr + 4, (ring_dma >> 16) >> 16);
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-
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- ring_dma += sizeof(struct cp_desc) * CP_RX_RING_SIZE;
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- cpw32_f(TxRingAddr, ring_dma & 0xffffffff);
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- cpw32_f(TxRingAddr + 4, (ring_dma >> 16) >> 16);
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-
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cpw16(MultiIntr, 0);
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cpw8_f(Cfg9346, Cfg9346_Lock);
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@@ -1192,6 +1219,7 @@ static void cp_tx_timeout(struct net_dev
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cp_clean_rings(cp);
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rc = cp_init_rings(cp);
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cp_start_hw(cp);
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+ cp_enable_irq(cp);
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netif_wake_queue(dev);
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