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wl12xx: Add support to RX packets payload alignment

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In case of QoS packets the packet payload isn't aligned to
4 bytes. In that case the mac80211 layer take care of that
via memmove() in ieee80211_deliver_skb().
Add support of copy packets from aggregation buffer to the
skbs with packet payload aligned care. In case of QoS packets
copy the packets in offset of 2 bytes guarantee payload aligned
to 4 bytes.

Signed-off-by: Shahar Levi <shahar_levi@ti.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
This commit is contained in:
Shahar Levi 2011-07-14 11:50:27 +03:00 committed by Luciano Coelho
parent f612cedfe1
commit 0a1d3abcc4
2 changed files with 36 additions and 11 deletions
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39
drivers/net/wireless/wl12xx/rx.c
View File

@ -38,12 +38,20 @@ static u8 wl1271_rx_get_mem_block(struct wl1271_fw_common_status *status,
}
static u32 wl1271_rx_get_buf_size(struct wl1271_fw_common_status *status,
u32 drv_rx_counter)
u32 drv_rx_counter)
{
return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
}
static bool wl1271_rx_get_unaligned(struct wl1271_fw_common_status *status,
u32 drv_rx_counter)
{
/* Convert the value to bool */
return !!(le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
RX_BUF_UNALIGNED_PAYLOAD);
}
static void wl1271_rx_status(struct wl1271 *wl,
struct wl1271_rx_descriptor *desc,
struct ieee80211_rx_status *status,
@ -89,7 +97,8 @@ static void wl1271_rx_status(struct wl1271 *wl,
}
}
static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
bool unaligned)
{
struct wl1271_rx_descriptor *desc;
struct sk_buff *skb;
@ -97,6 +106,7 @@ static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
u8 *buf;
u8 beacon = 0;
u8 is_data = 0;
u8 reserved = unaligned ? NET_IP_ALIGN : 0;
/*
* In PLT mode we seem to get frames and mac80211 warns about them,
@ -131,17 +141,25 @@ static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
return -EINVAL;
}
skb = __dev_alloc_skb(length, GFP_KERNEL);
/* skb length not included rx descriptor */
skb = __dev_alloc_skb(length + reserved - sizeof(*desc), GFP_KERNEL);
if (!skb) {
wl1271_error("Couldn't allocate RX frame");
return -ENOMEM;
}
buf = skb_put(skb, length);
memcpy(buf, data, length);
/* reserve the unaligned payload(if any) */
skb_reserve(skb, reserved);
/* now we pull the descriptor out of the buffer */
skb_pull(skb, sizeof(*desc));
buf = skb_put(skb, length - sizeof(*desc));
/*
* Copy packets from aggregation buffer to the skbs without rx
* descriptor and with packet payload aligned care. In case of unaligned
* packets copy the packets in offset of 2 bytes guarantee IP header
* payload aligned to 4 bytes.
*/
memcpy(buf, data + sizeof(*desc), length - sizeof(*desc));
hdr = (struct ieee80211_hdr *)skb->data;
if (ieee80211_is_beacon(hdr->frame_control))
@ -175,6 +193,7 @@ void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status)
u32 pkt_offset;
bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
bool had_data = false;
bool unaligned = false;
while (drv_rx_counter != fw_rx_counter) {
buf_size = 0;
@ -222,6 +241,10 @@ void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status)
while (pkt_offset < buf_size) {
pkt_length = wl1271_rx_get_buf_size(status,
drv_rx_counter);
unaligned = wl1271_rx_get_unaligned(status,
drv_rx_counter);
/*
* the handle data call can only fail in memory-outage
* conditions, in that case the received frame will just
@ -229,7 +252,7 @@ void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status)
*/
if (wl1271_rx_handle_data(wl,
wl->aggr_buf + pkt_offset,
pkt_length) == 1)
pkt_length, unaligned) == 1)
had_data = true;
wl->rx_counter++;

8
drivers/net/wireless/wl12xx/rx.h
View File

@ -93,9 +93,11 @@
#define WL1271_RX_DESC_MIC_FAIL 0x02
#define WL1271_RX_DESC_DRIVER_RX_Q_FAIL 0x03
#define RX_MEM_BLOCK_MASK 0xFF
#define RX_BUF_SIZE_MASK 0xFFF00
#define RX_BUF_SIZE_SHIFT_DIV 6
#define RX_MEM_BLOCK_MASK 0xFF
#define RX_BUF_SIZE_MASK 0xFFF00
#define RX_BUF_SIZE_SHIFT_DIV 6
/* If set, the start of IP payload is not 4 bytes aligned */
#define RX_BUF_UNALIGNED_PAYLOAD BIT(20)
enum {
WL12XX_RX_CLASS_UNKNOWN,