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gianfar: Fix reported number of sent bytes to BQL

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This is a backported patch for the gianfar ethernet driver
used in TPLink 4900 v1. It is supposed to fix the error which
show up in dmesg with:
NETDEV WATCHDOG: eth0 (fsl-gianfar): transmit queue xy timed out
Full upstream patch is at: http://patchwork.ozlabs.org/patch/271242

Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>

SVN-Revision: 39692
This commit is contained in:
Felix Fietkau 2014-02-22 14:42:48 +00:00
parent 8167b27bca
commit 7a8f13f33c
1 changed files with 77 additions and 0 deletions
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77
target/linux/mpc85xx/patches-3.10/220-fix_gianfar_reported_number_of_sent_bytes_to_BQL.patch Normal file
View file

@ -0,0 +1,77 @@
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2064,7 +2064,7 @@ static int gfar_start_xmit(struct sk_buf
int i, rq = 0, do_tstamp = 0;
u32 bufaddr;
unsigned long flags;
- unsigned int nr_frags, nr_txbds, length, fcb_length = GMAC_FCB_LEN;
+ unsigned int nr_frags, nr_txbds, bytes_sent, fcb_length = GMAC_FCB_LEN;
/* TOE=1 frames larger than 2500 bytes may see excess delays
* before start of transmission.
@@ -2130,7 +2130,10 @@ static int gfar_start_xmit(struct sk_buf
}
/* Update transmit stats */
- tx_queue->stats.tx_bytes += skb->len;
+ bytes_sent = skb->len;
+ tx_queue->stats.tx_bytes += bytes_sent;
+ /* keep Tx bytes on wire for BQL accounting */
+ GFAR_CB(skb)->bytes_sent = bytes_sent;
tx_queue->stats.tx_packets++;
txbdp = txbdp_start = tx_queue->cur_tx;
@@ -2150,12 +2153,13 @@ static int gfar_start_xmit(struct sk_buf
} else {
/* Place the fragment addresses and lengths into the TxBDs */
for (i = 0; i < nr_frags; i++) {
+ unsigned int frag_len;
/* Point at the next BD, wrapping as needed */
txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
- length = skb_shinfo(skb)->frags[i].size;
+ frag_len = skb_shinfo(skb)->frags[i].size;
- lstatus = txbdp->lstatus | length |
+ lstatus = txbdp->lstatus | frag_len |
BD_LFLAG(TXBD_READY);
/* Handle the last BD specially */
@@ -2165,7 +2169,7 @@ static int gfar_start_xmit(struct sk_buf
bufaddr = skb_frag_dma_map(priv->dev,
&skb_shinfo(skb)->frags[i],
0,
- length,
+ frag_len,
DMA_TO_DEVICE);
/* set the TxBD length and buffer pointer */
@@ -2231,7 +2235,7 @@ static int gfar_start_xmit(struct sk_buf
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
}
- netdev_tx_sent_queue(txq, skb->len);
+ netdev_tx_sent_queue(txq, bytes_sent);
/* We can work in parallel with gfar_clean_tx_ring(), except
* when modifying num_txbdfree. Note that we didn't grab the lock
@@ -2551,7 +2555,7 @@ static void gfar_clean_tx_ring(struct gf
bdp = next_txbd(bdp, base, tx_ring_size);
}
- bytes_sent += skb->len;
+ bytes_sent += GFAR_CB(skb)->bytes_sent;
dev_kfree_skb_any(skb);
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -571,7 +571,7 @@ struct rxfcb {
};
struct gianfar_skb_cb {
- int alignamount;
+ unsigned int bytes_sent; /* bytes-on-wire (i.e. no FCB) */
};
#define GFAR_CB(skb) ((struct gianfar_skb_cb *)((skb)->cb))