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staging: vt6656: Use sk_buff buffer for tx header 

mac80211 can provide space for the driver to put a tx header on
the skb buffer instead coping the entire frame on to a local
buffer with the header.

To use this extra_tx_headroom must be set in mac80211 with the largest
possible header which is struct vnt_tx_buffer.

The driver has 8 possible combinations of tx header size which
are found in vnt_get_hdr_size replacing vnt_mac_hdr_pos.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/7b967bfc-1d4b-4b45-efab-d54f16cca226@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2020-05-16 11:35:22 +01:00 committed by Greg Kroah-Hartman
parent 16438cf707
commit abfd23743d
5 changed files with 61 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/staging/vt6656/device.h
View File

@ -240,6 +240,7 @@ struct vnt_usb_send_context {
struct sk_buff *skb;
struct urb *urb;
struct ieee80211_hdr *hdr;
void *tx_buffer;
unsigned int buf_len;
u32 frame_len;
u16 tx_hdr_size;

1
drivers/staging/vt6656/main_usb.c
View File

@ -1053,6 +1053,7 @@ vt6656_probe(struct usb_interface *intf, const struct usb_device_id *id)
ieee80211_hw_set(priv->hw, SUPPORTS_PS);
ieee80211_hw_set(priv->hw, PS_NULLFUNC_STACK);
priv->hw->extra_tx_headroom = sizeof(struct vnt_tx_buffer);
priv->hw->max_signal = 100;
SET_IEEE80211_DEV(priv->hw, &intf->dev);

91
drivers/staging/vt6656/rxtx.c
View File

@ -188,19 +188,6 @@ static __le16 vnt_get_cts_duration(struct vnt_usb_send_context *context)
context->frame_len, info);
}
static u16 vnt_mac_hdr_pos(struct vnt_usb_send_context *tx_context,
struct ieee80211_hdr *hdr)
{
u8 *head = tx_context->data + offsetof(struct vnt_tx_buffer, fifo_head);
u8 *hdr_pos = (u8 *)hdr;
tx_context->hdr = hdr;
if (!tx_context->hdr)
return 0;
return (u16)(hdr_pos - head);
}
static void vnt_rxtx_datahead_g(struct vnt_usb_send_context *tx_context,
struct vnt_tx_datahead_g *buf)
{
@ -221,8 +208,6 @@ static void vnt_rxtx_datahead_g(struct vnt_usb_send_context *tx_context,
buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
buf->time_stamp_off_b = vnt_time_stamp_off(priv,
priv->top_cck_basic_rate);
tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
}
static void vnt_rxtx_datahead_ab(struct vnt_usb_send_context *tx_context,
@ -241,8 +226,6 @@ static void vnt_rxtx_datahead_ab(struct vnt_usb_send_context *tx_context,
/* Get Duration and TimeStampOff */
buf->duration = hdr->duration_id;
buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
}
static void vnt_fill_ieee80211_rts(struct vnt_usb_send_context *tx_context,
@ -479,6 +462,39 @@ static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
}
}
static u16 vnt_get_hdr_size(struct ieee80211_tx_info *info)
{
u16 size = sizeof(struct vnt_tx_datahead_ab);
if (info->control.use_cts_prot) {
if (info->control.use_rts)
size = sizeof(struct vnt_rts_g);
else
size = sizeof(struct vnt_cts);
} else if (info->control.use_rts) {
size = sizeof(struct vnt_rts_ab);
}
if (info->control.hw_key) {
if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP)
size += sizeof(struct vnt_mic_hdr);
}
/* Get rrv_time header */
if (info->control.use_cts_prot) {
if (info->control.use_rts)
size += sizeof(struct vnt_rrv_time_rts);
else
size += sizeof(struct vnt_rrv_time_cts);
} else {
size += sizeof(struct vnt_rrv_time_ab);
}
size += sizeof(struct vnt_tx_fifo_head);
return size;
}
int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
@ -531,12 +547,29 @@ int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
tx_context->need_ack = false;
tx_context->frame_len = skb->len + 4;
tx_context->tx_rate = rate->hw_value;
tx_context->hdr = hdr;
spin_unlock_irqrestore(&priv->lock, flags);
tx_buffer = (struct vnt_tx_buffer *)tx_context->data;
tx_buffer_head = &tx_buffer->fifo_head;
tx_header_size = vnt_get_hdr_size(info);
tx_body_size = skb->len;
tx_bytes = tx_header_size + tx_body_size;
tx_header_size += sizeof(struct vnt_tx_usb_header);
tx_buffer = skb_push(skb, tx_header_size);
tx_buffer_head = &tx_buffer->fifo_head;
/* Fill USB header */
tx_buffer->usb.tx_byte_count = cpu_to_le16(tx_bytes);
tx_buffer->usb.pkt_no = tx_context->pkt_no;
tx_buffer->usb.type = 0x00;
tx_context->type = CONTEXT_DATA_PACKET;
tx_context->tx_buffer = tx_buffer;
tx_context->buf_len = skb->len;
/* Return skb->data to mac80211 header */
skb_pull(skb, tx_header_size);
/*Set fifo controls */
if (pkt_type == PK_TYPE_11A)
@ -603,18 +636,8 @@ int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
vnt_generate_tx_parameter(tx_context, tx_buffer, &mic_hdr,
need_mic, need_rts);
tx_header_size = tx_context->tx_hdr_size;
if (!tx_header_size) {
tx_context->in_use = false;
return -ENOMEM;
}
tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_NONFRAG);
tx_bytes = tx_header_size + tx_body_size;
memcpy(tx_context->hdr, skb->data, tx_body_size);
if (info->control.hw_key) {
tx_key = info->control.hw_key;
if (tx_key->keylen > 0)
@ -625,15 +648,6 @@ int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
priv->seq_counter = (le16_to_cpu(hdr->seq_ctrl) &
IEEE80211_SCTL_SEQ) >> 4;
tx_buffer->tx_byte_count = cpu_to_le16(tx_bytes);
tx_buffer->pkt_no = tx_context->pkt_no;
tx_buffer->type = 0x00;
tx_bytes += 4;
tx_context->type = CONTEXT_DATA_PACKET;
tx_context->buf_len = tx_bytes;
spin_lock_irqsave(&priv->lock, flags);
if (vnt_tx_context(priv, tx_context)) {
@ -725,6 +739,7 @@ static int vnt_beacon_xmit(struct vnt_private *priv, struct sk_buff *skb)
beacon_buffer->type = 0x01;
context->type = CONTEXT_BEACON_PACKET;
context->tx_buffer = &context->data;
context->buf_len = count + 4; /* USB header */
spin_lock_irqsave(&priv->lock, flags);

8
drivers/staging/vt6656/rxtx.h
View File

@ -77,14 +77,12 @@ struct vnt_tx_datahead_g {
__le16 duration_a;
__le16 time_stamp_off_b;
__le16 time_stamp_off_a;
struct ieee80211_hdr hdr;
} __packed;
struct vnt_tx_datahead_ab {
struct vnt_phy_field ab;
__le16 duration;
__le16 time_stamp_off;
struct ieee80211_hdr hdr;
} __packed;
/* RTS buffer header */
@ -161,10 +159,14 @@ struct vnt_tx_fifo_head {
__le16 current_rate;
} __packed;
struct vnt_tx_buffer {
struct vnt_tx_usb_header {
u8 type;
u8 pkt_no;
__le16 tx_byte_count;
} __packed;
struct vnt_tx_buffer {
struct vnt_tx_usb_header usb;
struct vnt_tx_fifo_head fifo_head;
union vnt_tx_head tx_head;
} __packed;

2
drivers/staging/vt6656/usbpipe.c
View File

@ -466,7 +466,7 @@ int vnt_tx_context(struct vnt_private *priv,
usb_fill_bulk_urb(urb,
priv->usb,
usb_sndbulkpipe(priv->usb, 3),
context->data,
context->tx_buffer,
context->buf_len,
vnt_tx_context_complete,
context);