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Message-ID: <20090326075844.30121.48999.stgit@lost.foo-projects.org>
Date: Thu, 26 Mar 2009 00:58:45 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, gospo@...hat.com,
Alexander Duyck <alexander.h.duyck@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next PATCH 1/3] e1000: fix tx hang detect logic and address dma
mapping issues
From: Alexander Duyck <alexander.h.duyck@...el.com>
This patch changes the dma mapping to better support
skb_dma_map/skb_dma_unmap and addresses and redefines the tx hang logic to
be based off of time stamp instead of if the dma field is populated
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/e1000/e1000_main.c | 55 ++++++++++++++++++++++------------------
1 files changed, 30 insertions(+), 25 deletions(-)
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 1f390ce..e60faab 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2056,6 +2056,7 @@ static void e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
dev_kfree_skb_any(buffer_info->skb);
buffer_info->skb = NULL;
}
+ buffer_info->time_stamp = 0;
/* buffer_info must be completely set up in the transmit path */
}
@@ -2903,24 +2904,24 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
unsigned int mss)
{
struct e1000_hw *hw = &adapter->hw;
+ struct e1000_buffer *buffer_info;
unsigned int len = skb_headlen(skb);
unsigned int offset, size, count = 0, i;
unsigned int f;
- dma_addr_t map;
+ dma_addr_t *map;
i = tx_ring->next_to_use;
if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
- dev_kfree_skb(skb);
- return -2;
+ return 0;
}
- map = skb_shinfo(skb)->dma_maps[0];
+ map = skb_shinfo(skb)->dma_maps;
offset = 0;
while (len) {
- struct e1000_buffer *buffer_info = &tx_ring->buffer_info[i];
+ buffer_info = &tx_ring->buffer_info[i];
size = min(len, max_per_txd);
/* Workaround for Controller erratum --
* descriptor for non-tso packet in a linear SKB that follows a
@@ -2953,14 +2954,18 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
size -= 4;
buffer_info->length = size;
- buffer_info->dma = map + offset;
+ buffer_info->dma = map[0] + offset;
buffer_info->time_stamp = jiffies;
buffer_info->next_to_watch = i;
len -= size;
offset += size;
count++;
- if (unlikely(++i == tx_ring->count)) i = 0;
+ if (len) {
+ i++;
+ if (unlikely(i == tx_ring->count))
+ i = 0;
+ }
}
for (f = 0; f < nr_frags; f++) {
@@ -2968,11 +2973,13 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
frag = &skb_shinfo(skb)->frags[f];
len = frag->size;
- map = skb_shinfo(skb)->dma_maps[f + 1];
offset = 0;
while (len) {
- struct e1000_buffer *buffer_info;
+ i++;
+ if (unlikely(i == tx_ring->count))
+ i = 0;
+
buffer_info = &tx_ring->buffer_info[i];
size = min(len, max_per_txd);
/* Workaround for premature desc write-backs
@@ -2988,21 +2995,18 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
size -= 4;
buffer_info->length = size;
- buffer_info->dma = map + offset;
+ buffer_info->dma = map[f + 1] + offset;
buffer_info->time_stamp = jiffies;
buffer_info->next_to_watch = i;
len -= size;
offset += size;
count++;
- if (unlikely(++i == tx_ring->count)) i = 0;
}
}
- i = (i == 0) ? tx_ring->count - 1 : i - 1;
tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[first].next_to_watch = i;
- smp_wmb();
return count;
}
@@ -3318,14 +3322,20 @@ static int e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
if (likely(skb->protocol == htons(ETH_P_IP)))
tx_flags |= E1000_TX_FLAGS_IPV4;
- e1000_tx_queue(adapter, tx_ring, tx_flags,
- e1000_tx_map(adapter, tx_ring, skb, first,
- max_per_txd, nr_frags, mss));
+ count = e1000_tx_map(adapter, tx_ring, skb, first, max_per_txd,
+ nr_frags, mss);
- netdev->trans_start = jiffies;
+ if (count) {
+ e1000_tx_queue(adapter, tx_ring, tx_flags, count);
+ netdev->trans_start = jiffies;
+ /* Make sure there is space in the ring for the next send. */
+ e1000_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 2);
- /* Make sure there is space in the ring for the next send. */
- e1000_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 2);
+ } else {
+ dev_kfree_skb_any(skb);
+ tx_ring->buffer_info[first].time_stamp = 0;
+ tx_ring->next_to_use = first;
+ }
return NETDEV_TX_OK;
}
@@ -3842,12 +3852,7 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
/* Detect a transmit hang in hardware, this serializes the
* check with the clearing of time_stamp and movement of i */
adapter->detect_tx_hung = false;
- /*
- * read barrier to make sure that the ->dma member and time
- * stamp are updated fully
- */
- smp_rmb();
- if (tx_ring->buffer_info[eop].dma &&
+ if (tx_ring->buffer_info[eop].time_stamp &&
time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
(adapter->tx_timeout_factor * HZ))
&& !(er32(STATUS) & E1000_STATUS_TXOFF)) {
--
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