diff options
Diffstat (limited to 'target/linux/leon/patches-2.6.36/020-greth_optimize_gbit_tx_descriptor_handling.patch')
| -rw-r--r-- | target/linux/leon/patches-2.6.36/020-greth_optimize_gbit_tx_descriptor_handling.patch | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/target/linux/leon/patches-2.6.36/020-greth_optimize_gbit_tx_descriptor_handling.patch b/target/linux/leon/patches-2.6.36/020-greth_optimize_gbit_tx_descriptor_handling.patch deleted file mode 100644 index 3a14eb76d..000000000 --- a/target/linux/leon/patches-2.6.36/020-greth_optimize_gbit_tx_descriptor_handling.patch +++ /dev/null @@ -1,61 +0,0 @@ -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()) |