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libertas: convert libertas driver to use an event/cmdresp queue

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This patch (co-developed by Dan Williams and Holger Schurig) uses a kfifo
object for events and a swapping buffer scheme for the command response to
preserve the zero-copy semantics of the CF driver and keep memory usage low.
The main thread should only ever touch the buffer indexed by priv->resp_idx,
while the interface code is free to write to the second buffer, then swap
priv->resp_idx under the driver spinlock.  The firmware specs only permit
one in-flight command, so there will only ever be one command response to
process at a time.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Holger Schurig
2008-04-01 14:50:43 +02:00
committed by John W. Linville
parent 98dd6a5759
commit 7919b89c82
13 changed files with 270 additions and 384 deletions
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10
drivers/net/wireless/libertas/decl.h
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@@ -19,7 +19,7 @@ struct cmd_ds_command;
void lbs_set_mac_control(struct lbs_private *priv);
void lbs_send_tx_feedback(struct lbs_private *priv);
void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count);
int lbs_free_cmd_buffer(struct lbs_private *priv);
@@ -30,14 +30,16 @@ int lbs_prepare_and_send_command(struct lbs_private *priv,
int lbs_allocate_cmd_buffer(struct lbs_private *priv);
int lbs_execute_next_command(struct lbs_private *priv);
int lbs_process_event(struct lbs_private *priv);
void lbs_interrupt(struct lbs_private *priv);
int lbs_process_event(struct lbs_private *priv, u32 event);
void lbs_queue_event(struct lbs_private *priv, u32 event);
void lbs_notify_command_response(struct lbs_private *priv, u8 resp_idx);
int lbs_set_radio_control(struct lbs_private *priv);
u32 lbs_fw_index_to_data_rate(u8 index);
u8 lbs_data_rate_to_fw_index(u32 rate);
/** The proc fs interface */
int lbs_process_rx_command(struct lbs_private *priv);
int lbs_process_command_response(struct lbs_private *priv, u8 *data, u32 len);
void lbs_complete_command(struct lbs_private *priv, struct cmd_ctrl_node *cmd,
int result);
int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev);