92 lines
2.8 KiB
Diff
92 lines
2.8 KiB
Diff
From 81cdbda2a08375b9d5915567d2210bf2433e7332 Mon Sep 17 00:00:00 2001
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From: John Crispin <john@phrozen.org>
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Date: Sat, 23 Apr 2016 11:57:21 +0200
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Subject: [PATCH 081/102] net-next: mediatek: fix DQL support
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The MTK ethernet core has 2 MACs both sitting on the same DMA ring. The
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current code will assign the TX traffic of each MAC to its own DQL. This
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results in the amount of data, that DQL says is in the queue incorrect. As
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the data from multiple devices is infact enqueued. This makes any decision
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based on these value non deterministic. Fix this by tracking all TX
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traffic, regardless of the MAC it belongs to in the DQL of all devices
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using the DMA.
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Signed-off-by: John Crispin <john@phrozen.org>
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---
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drivers/net/ethernet/mediatek/mtk_eth_soc.c | 33 ++++++++++++++++-----------
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1 file changed, 20 insertions(+), 13 deletions(-)
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--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@@ -656,7 +656,16 @@ static int mtk_tx_map(struct sk_buff *sk
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WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) |
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(!nr_frags * TX_DMA_LS0)));
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- netdev_sent_queue(dev, skb->len);
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+ /* we have a single DMA ring so BQL needs to be updated for all devices
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+ * sitting on this ring
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+ */
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+ for (i = 0; i < MTK_MAC_COUNT; i++) {
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+ if (!eth->netdev[i])
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+ continue;
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+
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+ netdev_sent_queue(eth->netdev[i], skb->len);
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+ }
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+
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skb_tx_timestamp(skb);
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ring->next_free = mtk_qdma_phys_to_virt(ring, txd->txd2);
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@@ -884,21 +893,18 @@ static int mtk_poll_tx(struct mtk_eth *e
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struct mtk_tx_dma *desc;
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struct sk_buff *skb;
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struct mtk_tx_buf *tx_buf;
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- int total = 0, done[MTK_MAX_DEVS];
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- unsigned int bytes[MTK_MAX_DEVS];
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+ int total = 0, done = 0;
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+ unsigned int bytes = 0;
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u32 cpu, dma;
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static int condition;
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int i;
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- memset(done, 0, sizeof(done));
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- memset(bytes, 0, sizeof(bytes));
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-
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cpu = mtk_r32(eth, MTK_QTX_CRX_PTR);
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dma = mtk_r32(eth, MTK_QTX_DRX_PTR);
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desc = mtk_qdma_phys_to_virt(ring, cpu);
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- while ((cpu != dma) && budget) {
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+ while ((cpu != dma) && done < budget) {
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u32 next_cpu = desc->txd2;
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int mac;
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@@ -918,9 +924,8 @@ static int mtk_poll_tx(struct mtk_eth *e
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}
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if (skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC) {
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- bytes[mac] += skb->len;
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- done[mac]++;
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- budget--;
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+ bytes += skb->len;
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+ done++;
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}
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mtk_tx_unmap(eth->dev, tx_buf);
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@@ -933,11 +938,13 @@ static int mtk_poll_tx(struct mtk_eth *e
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mtk_w32(eth, cpu, MTK_QTX_CRX_PTR);
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+ /* we have a single DMA ring so BQL needs to be updated for all devices
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+ * sitting on this ring
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+ */
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for (i = 0; i < MTK_MAC_COUNT; i++) {
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- if (!eth->netdev[i] || !done[i])
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+ if (!eth->netdev[i])
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continue;
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- netdev_completed_queue(eth->netdev[i], done[i], bytes[i]);
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- total += done[i];
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+ netdev_completed_queue(eth->netdev[i], done, bytes);
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}
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/* read hw index again make sure no new tx packet */
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