From 1df94a8578eb099d9362cc0b84ef85015c47bbc5 Mon Sep 17 00:00:00 2001 From: Vasanthakumar Thiagarajan Date: Wed, 17 Aug 2011 18:45:10 +0530 Subject: [PATCH] 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 Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath6kl/core.h | 3 +++ drivers/net/wireless/ath/ath6kl/init.c | 2 +- drivers/net/wireless/ath/ath6kl/main.c | 2 +- drivers/net/wireless/ath/ath6kl/sdio.c | 25 +++++++++++++++---------- drivers/net/wireless/ath/ath6kl/txrx.c | 2 ++ 5 files changed, 22 insertions(+), 12 deletions(-) diff --git a/drivers/net/wireless/ath/ath6kl/core.h b/drivers/net/wireless/ath/ath6kl/core.h index 214d1144b9bf..a1aa2ef398f7 100644 --- a/drivers/net/wireless/ath/ath6kl/core.h +++ b/drivers/net/wireless/ath/ath6kl/core.h @@ -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 */ diff --git a/drivers/net/wireless/ath/ath6kl/init.c b/drivers/net/wireless/ath/ath6kl/init.c index df15bfad6043..75230ac28537 100644 --- a/drivers/net/wireless/ath/ath6kl/init.c +++ b/drivers/net/wireless/ath/ath6kl/init.c @@ -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) diff --git a/drivers/net/wireless/ath/ath6kl/main.c b/drivers/net/wireless/ath/ath6kl/main.c index f236aa8c6b8f..868838bb6b88 100644 --- a/drivers/net/wireless/ath/ath6kl/main.c +++ b/drivers/net/wireless/ath/ath6kl/main.c @@ -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; } diff --git a/drivers/net/wireless/ath/ath6kl/sdio.c b/drivers/net/wireless/ath/ath6kl/sdio.c index 34171604cbe4..f393090ecefe 100644 --- a/drivers/net/wireless/ath/ath6kl/sdio.c +++ b/drivers/net/wireless/ath/ath6kl/sdio.c @@ -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); diff --git a/drivers/net/wireless/ath/ath6kl/txrx.c b/drivers/net/wireless/ath/ath6kl/txrx.c index 44bf2271b162..ba1350d939a7 100644 --- a/drivers/net/wireless/ath/ath6kl/txrx.c +++ b/drivers/net/wireless/ath/ath6kl/txrx.c @@ -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); -- 2.30.2