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at86rf230: add transmit retry support 

This patch introduce a transmit retry handling into at86rf230 transmit
path. Current behaviour is to wait the normal receive time if we want
to go into STATE_TX_ON when the transceiver is in STATE_BUSY_RX_AACK
which indicates that a frame is currently receiving. A non force state
change will not interrupt the the receiving state.

The current behaviour is that after the normal receive time we will
start a force change into STATE_TX_ON. With this patch we do seven
retries to go into STATE_TX_ON without forcing. After we hit the
AT86RF2XX_MAX_TX_RETRIES we will start the force state change.
This is a polling like method to go into STATE_TX_ON in times of maximum
receiving time.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-03-01 21:55:28 +01:00 committed by Marcel Holtmann
parent 3267c884ce
commit ba6d223932
1 changed files with 21 additions and 3 deletions
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24
drivers/net/ieee802154/at86rf230.c
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@ -52,7 +52,13 @@ struct at86rf2xx_chip_data {
int (*get_desense_steps)(struct at86rf230_local *, s32);
};
#define AT86RF2XX_MAX_BUF (127 + 3)
#define AT86RF2XX_MAX_BUF (127 + 3)
/* tx retries to access the TX_ON state
* if it's above then force change will be started.
*
* We assume the max_frame_retries (7) value of 802.15.4 here.
*/
#define AT86RF2XX_MAX_TX_RETRIES 7
struct at86rf230_state_change {
struct at86rf230_local *lp;
@ -85,6 +91,7 @@ struct at86rf230_local {
bool is_tx;
/* spinlock for is_tx protection */
spinlock_t lock;
u8 tx_retry;
struct sk_buff *tx_skb;
struct at86rf230_state_change tx;
};
@ -512,10 +519,20 @@ at86rf230_async_state_assert(void *context)
* in STATE_BUSY_RX_AACK, we run a force state change
* to STATE_TX_ON. This is a timeout handling, if the
* transceiver stucks in STATE_BUSY_RX_AACK.
*
* Additional we do several retries to try to get into
* TX_ON state without forcing. If the retries are
* higher or equal than AT86RF2XX_MAX_TX_RETRIES we
* will do a force change.
*/
if (ctx->to_state == STATE_TX_ON) {
at86rf230_async_state_change(lp, ctx,
STATE_FORCE_TX_ON,
u8 state = STATE_TX_ON;
if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
state = STATE_FORCE_TX_ON;
lp->tx_retry++;
at86rf230_async_state_change(lp, ctx, state,
ctx->complete,
ctx->irq_enable);
return;
@ -963,6 +980,7 @@ at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
if (lp->tx_aret)
tx_complete = at86rf230_xmit_tx_on;
lp->tx_retry = 0;
at86rf230_async_state_change(lp, ctx, STATE_TX_ON, tx_complete, false);
return 0;