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authorGabor Juhos <juhosg@openwrt.org>2009-07-13 11:40:10 +0000
committerGabor Juhos <juhosg@openwrt.org>2009-07-13 11:40:10 +0000
commita579511dbf89890992ed6c35e5bd7fd6411c56ef (patch)
tree992b60685c8f7922325c6770d6571d2a0e1fc74d /target/linux/ar71xx
parent82a084680a527039a3fda555131919cc29a498d7 (diff)
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ag71xx driver: align descriptors on cache_line boundary
SVN-Revision: 16825
Diffstat (limited to 'target/linux/ar71xx')
-rw-r--r--target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h3
-rw-r--r--target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c33
2 files changed, 25 insertions, 11 deletions
diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
index ca328e3..2e73133 100644
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
@@ -38,7 +38,7 @@
#define ETH_FCS_LEN 4
#define AG71XX_DRV_NAME "ag71xx"
-#define AG71XX_DRV_VERSION "0.5.22"
+#define AG71XX_DRV_VERSION "0.5.23"
#define AG71XX_NAPI_WEIGHT 64
#define AG71XX_OOM_REFILL (1 + HZ/10)
@@ -96,6 +96,7 @@ struct ag71xx_ring {
struct ag71xx_buf *buf;
struct ag71xx_desc *descs_cpu;
dma_addr_t descs_dma;
+ unsigned int desc_size;
unsigned int curr;
unsigned int dirty;
unsigned int size;
diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index 6302bf6..1aa24b3 100644
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -11,6 +11,7 @@
* by the Free Software Foundation.
*/
+#include <linux/cache.h>
#include "ag71xx.h"
#define AG71XX_DEFAULT_MSG_ENABLE \
@@ -86,7 +87,7 @@ static void ag71xx_ring_free(struct ag71xx_ring *ring)
kfree(ring->buf);
if (ring->descs_cpu)
- dma_free_coherent(NULL, ring->size * sizeof(struct ag71xx_desc),
+ dma_free_coherent(NULL, ring->size * ring->desc_size,
ring->descs_cpu, ring->descs_dma);
}
@@ -95,10 +96,16 @@ static int ag71xx_ring_alloc(struct ag71xx_ring *ring, unsigned int size)
int err;
int i;
- ring->descs_cpu = dma_alloc_coherent(NULL,
- size * sizeof(struct ag71xx_desc),
- &ring->descs_dma,
- GFP_ATOMIC);
+ ring->desc_size = sizeof(struct ag71xx_desc);
+ if (ring->desc_size % cache_line_size()) {
+ DBG("ag71xx: ring %p, desc size %u rounded to %u\n",
+ ring, ring->desc_size,
+ roundup(ring->desc_size, cache_line_size()));
+ ring->desc_size = roundup(ring->desc_size, cache_line_size());
+ }
+
+ ring->descs_cpu = dma_alloc_coherent(NULL, size * ring->desc_size,
+ &ring->descs_dma, GFP_ATOMIC);
if (!ring->descs_cpu) {
err = -ENOMEM;
goto err;
@@ -113,8 +120,9 @@ static int ag71xx_ring_alloc(struct ag71xx_ring *ring, unsigned int size)
}
for (i = 0; i < size; i++) {
- struct ag71xx_desc *descs = (struct ag71xx_desc *) ring->descs_cpu;
- ring->buf[i].desc = &descs[i];
+ ring->buf[i].desc = (struct ag71xx_desc *)&ring->descs_cpu[i * ring->desc_size];
+ DBG("ag71xx: ring %p, desc %d at %p\n",
+ ring, i, ring->buf[i].desc);
}
return 0;
@@ -156,7 +164,7 @@ static void ag71xx_ring_tx_init(struct ag71xx *ag)
for (i = 0; i < AG71XX_TX_RING_SIZE; i++) {
ring->buf[i].desc->next = (u32) (ring->descs_dma +
- sizeof(struct ag71xx_desc) * ((i + 1) % AG71XX_TX_RING_SIZE));
+ ring->desc_size * ((i + 1) % AG71XX_TX_RING_SIZE));
ring->buf[i].desc->ctrl = DESC_EMPTY;
ring->buf[i].skb = NULL;
@@ -190,9 +198,14 @@ static int ag71xx_ring_rx_init(struct ag71xx *ag)
int ret;
ret = 0;
- for (i = 0; i < AG71XX_RX_RING_SIZE; i++)
+ for (i = 0; i < AG71XX_RX_RING_SIZE; i++) {
ring->buf[i].desc->next = (u32) (ring->descs_dma +
- sizeof(struct ag71xx_desc) * ((i + 1) % AG71XX_RX_RING_SIZE));
+ ring->desc_size * ((i + 1) % AG71XX_RX_RING_SIZE));
+
+ DBG("ag71xx: RX desc at %p, next is %08x\n",
+ ring->buf[i].desc,
+ ring->buf[i].desc->next);
+ }
for (i = 0; i < AG71XX_RX_RING_SIZE; i++) {
struct sk_buff *skb;