On Mon, 03 Jun 2013 at 08:02 GMT, Eliezer Tamir <[email protected]>
wrote:
> +/* called from the device poll rutine to get ownership of a q_vector */
> +static inline bool ixgbe_qv_lock_napi(struct ixgbe_q_vector *q_vector)
> +{
> + int rc = true;
bool rc = true;
> + spin_lock(&q_vector->lock);
> + if (q_vector->state & IXGBE_QV_LOCKED) {
> + WARN_ON(q_vector->state & IXGBE_QV_STATE_NAPI);
> + q_vector->state |= IXGBE_QV_STATE_NAPI_YIELD;
> + rc = false;
> + } else
> + /* we don't care if someone yielded */
> + q_vector->state = IXGBE_QV_STATE_NAPI;
> + spin_unlock(&q_vector->lock);
> + return rc;
> +}
> +
> +/* returns true is someone tried to get the qv while napi had it */
> +static inline bool ixgbe_qv_unlock_napi(struct ixgbe_q_vector *q_vector)
> +{
> + int rc = false;
bool rc = false;
> + spin_lock(&q_vector->lock);
> + WARN_ON(q_vector->state & (IXGBE_QV_STATE_POLL |
> + IXGBE_QV_STATE_NAPI_YIELD));
> +
> + if (q_vector->state & IXGBE_QV_STATE_POLL_YIELD)
> + rc = true;
> + q_vector->state = IXGBE_QV_STATE_IDLE;
> + spin_unlock(&q_vector->lock);
> + return rc;
> +}
> +
> +/* called from ixgbe_low_latency_poll() */
> +static inline bool ixgbe_qv_lock_poll(struct ixgbe_q_vector *q_vector)
> +{
> + int rc = true;
Ditto.
> + spin_lock_bh(&q_vector->lock);
> + if ((q_vector->state & IXGBE_QV_LOCKED)) {
> + q_vector->state |= IXGBE_QV_STATE_POLL_YIELD;
> + rc = false;
> + } else
> + /* preserve yield marks */
> + q_vector->state |= IXGBE_QV_STATE_POLL;
> + spin_unlock_bh(&q_vector->lock);
> + return rc;
> +}
> +
> +/* returns true if someone tried to get the qv while it was locked */
> +static inline bool ixgbe_qv_unlock_poll(struct ixgbe_q_vector *q_vector)
> +{
> + int rc = false;
Ditto.
> + spin_lock_bh(&q_vector->lock);
> + WARN_ON(q_vector->state & (IXGBE_QV_STATE_NAPI));
> +
> + if (q_vector->state & IXGBE_QV_STATE_POLL_YIELD)
> + rc = true;
> + q_vector->state = IXGBE_QV_STATE_IDLE;
> + spin_unlock_bh(&q_vector->lock);
> + return rc;
> +}
> +
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