mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-19 21:37:37 +03:00
62 lines
1.9 KiB
Diff
62 lines
1.9 KiB
Diff
|
From 544631281bed5cc37b8f2d3a99f44c9d4b97f9a8 Mon Sep 17 00:00:00 2001
|
||
|
From: Daniel Hellstrom <daniel@gaisler.com>
|
||
|
Date: Wed, 1 Dec 2010 10:07:12 +0100
|
||
|
Subject: [PATCH] GRETH: GBit transmit descriptor handling optimization
|
||
|
|
||
|
It is safe to enable all fragments before enabling the first descriptor,
|
||
|
this way all descriptors don't have to be processed twice, added extra
|
||
|
memory barrier.
|
||
|
|
||
|
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
|
||
|
---
|
||
|
drivers/net/greth.c | 19 ++++++++++---------
|
||
|
1 files changed, 10 insertions(+), 9 deletions(-)
|
||
|
|
||
|
--- a/drivers/net/greth.c
|
||
|
+++ b/drivers/net/greth.c
|
||
|
@@ -512,7 +512,7 @@ greth_start_xmit_gbit(struct sk_buff *sk
|
||
|
greth->tx_skbuff[curr_tx] = NULL;
|
||
|
bdp = greth->tx_bd_base + curr_tx;
|
||
|
|
||
|
- status = GRETH_TXBD_CSALL;
|
||
|
+ status = GRETH_TXBD_CSALL | GRETH_BD_EN;
|
||
|
status |= frag->size & GRETH_BD_LEN;
|
||
|
|
||
|
/* Wrap around descriptor ring */
|
||
|
@@ -549,26 +549,27 @@ greth_start_xmit_gbit(struct sk_buff *sk
|
||
|
|
||
|
wmb();
|
||
|
|
||
|
- /* Enable the descriptors that we configured ... */
|
||
|
- for (i = 0; i < nr_frags + 1; i++) {
|
||
|
- bdp = greth->tx_bd_base + greth->tx_next;
|
||
|
- greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
|
||
|
- greth->tx_next = NEXT_TX(greth->tx_next);
|
||
|
- greth->tx_free--;
|
||
|
- }
|
||
|
+ /* Enable the descriptor chain by enabling the first descriptor */
|
||
|
+ bdp = greth->tx_bd_base + greth->tx_next;
|
||
|
+ greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
|
||
|
+ greth->tx_next = curr_tx;
|
||
|
+ greth->tx_free -= nr_frags + 1;
|
||
|
+
|
||
|
+ wmb();
|
||
|
|
||
|
greth_enable_tx(greth);
|
||
|
|
||
|
return NETDEV_TX_OK;
|
||
|
|
||
|
frag_map_error:
|
||
|
- /* Unmap SKB mappings that succeeded */
|
||
|
+ /* Unmap SKB mappings that succeeded and disable descriptor */
|
||
|
for (i = 0; greth->tx_next + i != curr_tx; i++) {
|
||
|
bdp = greth->tx_bd_base + greth->tx_next + i;
|
||
|
dma_unmap_single(greth->dev,
|
||
|
greth_read_bd(&bdp->addr),
|
||
|
greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
|
||
|
DMA_TO_DEVICE);
|
||
|
+ greth_write_bd(&bdp->stat, 0);
|
||
|
}
|
||
|
map_error:
|
||
|
if (net_ratelimit())
|