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Date: Mon, 21 Jul 2008 10:25:50 +0200
From: Brice Goglin <brice@...i.com>
To: Jeff Garzik <jeff@...zik.org>
CC: netdev@...r.kernel.org
Subject: [PATCH 1/2] myri10ge: remove wcfifo
Remove the wcfifo since it never gave any performance improvement.
Signed-off-by: Brice Goglin <brice@...i.com>
---
drivers/net/myri10ge/myri10ge.c | 54 ++--------------------------------------
1 file changed, 3 insertions(+), 51 deletions(-)
Index: linux-2.6/drivers/net/myri10ge/myri10ge.c
===================================================================
--- linux-2.6.orig/drivers/net/myri10ge/myri10ge.c 2008-07-21 09:23:20.000000000 +0200
+++ linux-2.6/drivers/net/myri10ge/myri10ge.c 2008-07-21 09:24:21.000000000 +0200
@@ -125,7 +125,6 @@
struct myri10ge_rx_buf {
struct mcp_kreq_ether_recv __iomem *lanai; /* lanai ptr for recv ring */
- u8 __iomem *wc_fifo; /* w/c rx dma addr fifo address */
struct mcp_kreq_ether_recv *shadow; /* host shadow of recv ring */
struct myri10ge_rx_buffer_state *info;
struct page *page;
@@ -140,7 +139,6 @@
struct myri10ge_tx_buf {
struct mcp_kreq_ether_send __iomem *lanai; /* lanai ptr for sendq */
- u8 __iomem *wc_fifo; /* w/c send fifo address */
struct mcp_kreq_ether_send *req_list; /* host shadow of sendq */
char *req_bytes;
struct myri10ge_tx_buffer_state *info;
@@ -332,10 +330,6 @@
static int myri10ge_reset_recover = 1;
-static int myri10ge_wcfifo = 0;
-module_param(myri10ge_wcfifo, int, S_IRUGO);
-MODULE_PARM_DESC(myri10ge_wcfifo, "Enable WC Fifo when WC is enabled");
-
static int myri10ge_max_slices = 1;
module_param(myri10ge_max_slices, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_max_slices, "Max tx/rx queues");
@@ -1218,14 +1212,8 @@
/* copy 8 descriptors to the firmware at a time */
if ((idx & 7) == 7) {
- if (rx->wc_fifo == NULL)
- myri10ge_submit_8rx(&rx->lanai[idx - 7],
- &rx->shadow[idx - 7]);
- else {
- mb();
- myri10ge_pio_copy(rx->wc_fifo,
- &rx->shadow[idx - 7], 64);
- }
+ myri10ge_submit_8rx(&rx->lanai[idx - 7],
+ &rx->shadow[idx - 7]);
}
}
}
@@ -2229,18 +2217,6 @@
ss->rx_big.lanai = (struct mcp_kreq_ether_recv __iomem *)
(mgp->sram + cmd.data0);
- if (myri10ge_wcfifo && mgp->wc_enabled) {
- ss->tx.wc_fifo = (u8 __iomem *)
- mgp->sram + MXGEFW_ETH_SEND_4 + 64 * slice;
- ss->rx_small.wc_fifo = (u8 __iomem *)
- mgp->sram + MXGEFW_ETH_RECV_SMALL + 64 * slice;
- ss->rx_big.wc_fifo = (u8 __iomem *)
- mgp->sram + MXGEFW_ETH_RECV_BIG + 64 * slice;
- } else {
- ss->tx.wc_fifo = NULL;
- ss->rx_small.wc_fifo = NULL;
- ss->rx_big.wc_fifo = NULL;
- }
return status;
}
@@ -2573,27 +2549,6 @@
mb();
}
-static inline void
-myri10ge_submit_req_wc(struct myri10ge_tx_buf *tx,
- struct mcp_kreq_ether_send *src, int cnt)
-{
- tx->req += cnt;
- mb();
- while (cnt >= 4) {
- myri10ge_pio_copy(tx->wc_fifo, src, 64);
- mb();
- src += 4;
- cnt -= 4;
- }
- if (cnt > 0) {
- /* pad it to 64 bytes. The src is 64 bytes bigger than it
- * needs to be so that we don't overrun it */
- myri10ge_pio_copy(tx->wc_fifo + MXGEFW_ETH_SEND_OFFSET(cnt),
- src, 64);
- mb();
- }
-}
-
/*
* Transmit a packet. We need to split the packet so that a single
* segment does not cross myri10ge->tx_boundary, so this makes segment
@@ -2830,10 +2785,7 @@
MXGEFW_FLAGS_FIRST)));
idx = ((count - 1) + tx->req) & tx->mask;
tx->info[idx].last = 1;
- if (tx->wc_fifo == NULL)
- myri10ge_submit_req(tx, tx->req_list, count);
- else
- myri10ge_submit_req_wc(tx, tx->req_list, count);
+ myri10ge_submit_req(tx, tx->req_list, count);
tx->pkt_start++;
if ((avail - count) < MXGEFW_MAX_SEND_DESC) {
tx->stop_queue++;
--
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