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ath6kl: Fix buffer alignment for scatter-gather I/O 

For non-scatter buffers, there is already a bounce buffer which
takes care of alignment. This patch is influenced by a rough patch of
Kalle.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Vasanthakumar Thiagarajan 2011-08-17 18:45:10 +05:30 committed by Kalle Valo
parent 13e34ea1f4
commit 1df94a8578
5 changed files with 22 additions and 12 deletions
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3
drivers/net/wireless/ath/ath6kl/core.h
View File

@ -42,6 +42,9 @@
#define ATH6KL_MAX_ENDPOINTS 4
#define MAX_NODE_NUM 15
/* Extra bytes for htc header alignment */
#define ATH6KL_HTC_ALIGN_BYTES 3
/* MAX_HI_COOKIE_NUM are reserved for high priority traffic */
#define MAX_DEF_COOKIE_NUM 180
#define MAX_HI_COOKIE_NUM 18 /* 10% of MAX_COOKIE_NUM */

2
drivers/net/wireless/ath/ath6kl/init.c
View File

@ -67,7 +67,7 @@ struct sk_buff *ath6kl_buf_alloc(int size)
/* Add chacheline space at front and back of buffer */
reserved = (2 * L1_CACHE_BYTES) + ATH6KL_DATA_OFFSET +
sizeof(struct htc_packet);
sizeof(struct htc_packet) + ATH6KL_HTC_ALIGN_BYTES;
skb = dev_alloc_skb(size + reserved);
if (skb)

2
drivers/net/wireless/ath/ath6kl/main.c
View File

@ -1347,7 +1347,7 @@ void init_netdev(struct net_device *dev)
dev->needed_headroom = ETH_HLEN;
dev->needed_headroom += sizeof(struct ath6kl_llc_snap_hdr) +
sizeof(struct wmi_data_hdr) + HTC_HDR_LENGTH
+ WMI_MAX_TX_META_SZ;
+ WMI_MAX_TX_META_SZ + ATH6KL_HTC_ALIGN_BYTES;
return;
}

25
drivers/net/wireless/ath/ath6kl/sdio.c
View File

@ -128,6 +128,17 @@ static int ath6kl_sdio_func0_cmd52_wr_byte(struct mmc_card *card,
return mmc_wait_for_cmd(card->host, &io_cmd, 0);
}
static void ath6kl_sdio_buf_align(u8 **buf, unsigned long len)
{
u8 *align_addr;
if (!IS_ALIGNED((unsigned long) *buf, 4)) {
align_addr = PTR_ALIGN(*buf - 4, 4);
memmove(align_addr, *buf, len);
*buf = align_addr;
}
}
static int ath6kl_sdio_io(struct sdio_func *func, u32 request, u32 addr,
u8 *buf, u32 len)
{
@ -213,16 +224,10 @@ static void ath6kl_sdio_setup_scat_data(struct hif_scatter_req *scat_req,
/* assemble SG list */
for (i = 0; i < scat_req->scat_entries; i++, sg++) {
if ((unsigned long)scat_req->scat_list[i].buf & 0x3)
/*
* Some scatter engines can handle unaligned
* buffers, print this as informational only.
*/
ath6kl_dbg(ATH6KL_DBG_SCATTER,
"(%s) scatter buffer is unaligned 0x%p\n",
scat_req->req & HIF_WRITE ? "WR" : "RD",
scat_req->scat_list[i].buf);
/* No header is added to rx buf, so it shoule be aligned */
if (data->flags == MMC_DATA_WRITE)
ath6kl_sdio_buf_align(&scat_req->scat_list[i].buf,
scat_req->scat_list[i].len);
ath6kl_dbg(ATH6KL_DBG_SCATTER, "%d: addr:0x%p, len:%d\n",
i, scat_req->scat_list[i].buf,
scat_req->scat_list[i].len);

2
drivers/net/wireless/ath/ath6kl/txrx.c
View File

@ -689,6 +689,7 @@ void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
break;
packet = (struct htc_packet *) skb->head;
skb->data = PTR_ALIGN(skb->data - 4, 4);
set_htc_rxpkt_info(packet, skb, skb->data,
ATH6KL_BUFFER_SIZE, endpoint);
list_add_tail(&packet->list, &queue);
@ -709,6 +710,7 @@ void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
return;
packet = (struct htc_packet *) skb->head;
skb->data = PTR_ALIGN(skb->data - 4, 4);
set_htc_rxpkt_info(packet, skb, skb->data,
ATH6KL_AMSDU_BUFFER_SIZE, 0);
spin_lock_bh(&ar->lock);