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mwifiex: DMA alignment for RX packets

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This patch adds support for DMA alignment of sk_buffs
allocated for RX.
Patch also adds support to modify skb allocation flags.

Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Qingshui Gao <gaoqs@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Avinash Patil 2015-02-13 17:41:08 +05:30 committed by Kalle Valo
parent 1c4c24eb7e
commit 31def91b3a
5 changed files with 35 additions and 4 deletions
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1
drivers/net/wireless/mwifiex/decl.h
View File

@ -33,6 +33,7 @@
#define MWIFIEX_MAX_BSS_NUM (3)
#define MWIFIEX_DMA_ALIGN_SZ 64
#define MWIFIEX_RX_HEADROOM 64
#define MAX_TXPD_SZ 32
#define INTF_HDR_ALIGN 4

4
drivers/net/wireless/mwifiex/main.h
View File

@ -140,6 +140,9 @@ enum {
#define MWIFIEX_DRV_INFO_SIZE_MAX 0x40000
/* Address alignment */
#define MWIFIEX_ALIGN_ADDR(p, a) (((long)(p) + (a) - 1) & ~((a) - 1))
struct mwifiex_dbg {
u32 num_cmd_host_to_card_failure;
u32 num_cmd_sleep_cfm_host_to_card_failure;
@ -1418,6 +1421,7 @@ u8 mwifiex_adjust_data_rate(struct mwifiex_private *priv,
u8 rx_rate, u8 ht_info);
void mwifiex_dump_drv_info(struct mwifiex_adapter *adapter);
void *mwifiex_alloc_rx_buf(int rx_len, gfp_t flags);
#ifdef CONFIG_DEBUG_FS
void mwifiex_debugfs_init(void);

6
drivers/net/wireless/mwifiex/pcie.c
View File

@ -498,7 +498,8 @@ static int mwifiex_init_rxq_ring(struct mwifiex_adapter *adapter)
for (i = 0; i < MWIFIEX_MAX_TXRX_BD; i++) {
/* Allocate skb here so that firmware can DMA data from it */
skb = dev_alloc_skb(MWIFIEX_RX_DATA_BUF_SIZE);
skb = mwifiex_alloc_rx_buf(MWIFIEX_RX_DATA_BUF_SIZE,
GFP_KERNEL | GFP_DMA);
if (!skb) {
dev_err(adapter->dev,
"Unable to allocate skb for RX ring.\n");
@ -1297,7 +1298,8 @@ static int mwifiex_pcie_process_recv_data(struct mwifiex_adapter *adapter)
}
}
skb_tmp = dev_alloc_skb(MWIFIEX_RX_DATA_BUF_SIZE);
skb_tmp = mwifiex_alloc_rx_buf(MWIFIEX_RX_DATA_BUF_SIZE,
GFP_KERNEL | GFP_DMA);
if (!skb_tmp) {
dev_err(adapter->dev,
"Unable to allocate skb.\n");

5
drivers/net/wireless/mwifiex/sdio.c
View File

@ -1357,7 +1357,7 @@ static int mwifiex_process_int_status(struct mwifiex_adapter *adapter)
return -1;
rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);
skb = dev_alloc_skb(rx_len);
skb = mwifiex_alloc_rx_buf(rx_len, GFP_KERNEL | GFP_DMA);
if (!skb)
return -1;
@ -1454,7 +1454,8 @@ static int mwifiex_process_int_status(struct mwifiex_adapter *adapter)
}
rx_len = (u16) (rx_blocks * MWIFIEX_SDIO_BLOCK_SIZE);
skb = dev_alloc_skb(rx_len);
skb = mwifiex_alloc_rx_buf(rx_len,
GFP_KERNEL | GFP_DMA);
if (!skb) {
dev_err(adapter->dev, "%s: failed to alloc skb",

23
drivers/net/wireless/mwifiex/util.c
View File

@ -631,3 +631,26 @@ void mwifiex_hist_data_reset(struct mwifiex_private *priv)
for (ix = 0; ix < MWIFIEX_MAX_SIG_STRENGTH; ix++)
atomic_set(&phist_data->sig_str[ix], 0);
}
void *mwifiex_alloc_rx_buf(int rx_len, gfp_t flags)
{
struct sk_buff *skb;
int buf_len, pad;
buf_len = rx_len + MWIFIEX_RX_HEADROOM + MWIFIEX_DMA_ALIGN_SZ;
skb = __dev_alloc_skb(buf_len, flags);
if (!skb)
return NULL;
skb_reserve(skb, MWIFIEX_RX_HEADROOM);
pad = MWIFIEX_ALIGN_ADDR(skb->data, MWIFIEX_DMA_ALIGN_SZ) -
(long)skb->data;
skb_reserve(skb, pad);
return skb;
}
EXPORT_SYMBOL_GPL(mwifiex_alloc_rx_buf);