diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/falcon/net_driver.h')
| -rw-r--r-- | drivers/net/ethernet/sfc/falcon/net_driver.h | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/drivers/net/ethernet/sfc/falcon/net_driver.h b/drivers/net/ethernet/sfc/falcon/net_driver.h index fe59dd67f918..37a8bdf32206 100644 --- a/drivers/net/ethernet/sfc/falcon/net_driver.h +++ b/drivers/net/ethernet/sfc/falcon/net_driver.h @@ -448,131 +448,6 @@ struct ef4_channel { struct ef4_tx_queue tx_queue[EF4_TXQ_TYPES]; }; -#ifdef CONFIG_NET_RX_BUSY_POLL -enum ef4_channel_busy_poll_state { - EF4_CHANNEL_STATE_IDLE = 0, - EF4_CHANNEL_STATE_NAPI = BIT(0), - EF4_CHANNEL_STATE_NAPI_REQ_BIT = 1, - EF4_CHANNEL_STATE_NAPI_REQ = BIT(1), - EF4_CHANNEL_STATE_POLL_BIT = 2, - EF4_CHANNEL_STATE_POLL = BIT(2), - EF4_CHANNEL_STATE_DISABLE_BIT = 3, -}; - -static inline void ef4_channel_busy_poll_init(struct ef4_channel *channel) -{ - WRITE_ONCE(channel->busy_poll_state, EF4_CHANNEL_STATE_IDLE); -} - -/* Called from the device poll routine to get ownership of a channel. */ -static inline bool ef4_channel_lock_napi(struct ef4_channel *channel) -{ - unsigned long prev, old = READ_ONCE(channel->busy_poll_state); - - while (1) { - switch (old) { - case EF4_CHANNEL_STATE_POLL: - /* Ensure ef4_channel_try_lock_poll() wont starve us */ - set_bit(EF4_CHANNEL_STATE_NAPI_REQ_BIT, - &channel->busy_poll_state); - /* fallthrough */ - case EF4_CHANNEL_STATE_POLL | EF4_CHANNEL_STATE_NAPI_REQ: - return false; - default: - break; - } - prev = cmpxchg(&channel->busy_poll_state, old, - EF4_CHANNEL_STATE_NAPI); - if (unlikely(prev != old)) { - /* This is likely to mean we've just entered polling - * state. Go back round to set the REQ bit. - */ - old = prev; - continue; - } - return true; - } -} - -static inline void ef4_channel_unlock_napi(struct ef4_channel *channel) -{ - /* Make sure write has completed from ef4_channel_lock_napi() */ - smp_wmb(); - WRITE_ONCE(channel->busy_poll_state, EF4_CHANNEL_STATE_IDLE); -} - -/* Called from ef4_busy_poll(). */ -static inline bool ef4_channel_try_lock_poll(struct ef4_channel *channel) -{ - return cmpxchg(&channel->busy_poll_state, EF4_CHANNEL_STATE_IDLE, - EF4_CHANNEL_STATE_POLL) == EF4_CHANNEL_STATE_IDLE; -} - -static inline void ef4_channel_unlock_poll(struct ef4_channel *channel) -{ - clear_bit_unlock(EF4_CHANNEL_STATE_POLL_BIT, &channel->busy_poll_state); -} - -static inline bool ef4_channel_busy_polling(struct ef4_channel *channel) -{ - return test_bit(EF4_CHANNEL_STATE_POLL_BIT, &channel->busy_poll_state); -} - -static inline void ef4_channel_enable(struct ef4_channel *channel) -{ - clear_bit_unlock(EF4_CHANNEL_STATE_DISABLE_BIT, - &channel->busy_poll_state); -} - -/* Stop further polling or napi access. - * Returns false if the channel is currently busy polling. - */ -static inline bool ef4_channel_disable(struct ef4_channel *channel) -{ - set_bit(EF4_CHANNEL_STATE_DISABLE_BIT, &channel->busy_poll_state); - /* Implicit barrier in ef4_channel_busy_polling() */ - return !ef4_channel_busy_polling(channel); -} - -#else /* CONFIG_NET_RX_BUSY_POLL */ - -static inline void ef4_channel_busy_poll_init(struct ef4_channel *channel) -{ -} - -static inline bool ef4_channel_lock_napi(struct ef4_channel *channel) -{ - return true; -} - -static inline void ef4_channel_unlock_napi(struct ef4_channel *channel) -{ -} - -static inline bool ef4_channel_try_lock_poll(struct ef4_channel *channel) -{ - return false; -} - -static inline void ef4_channel_unlock_poll(struct ef4_channel *channel) -{ -} - -static inline bool ef4_channel_busy_polling(struct ef4_channel *channel) -{ - return false; -} - -static inline void ef4_channel_enable(struct ef4_channel *channel) -{ -} - -static inline bool ef4_channel_disable(struct ef4_channel *channel) -{ - return true; -} -#endif /* CONFIG_NET_RX_BUSY_POLL */ - /** * struct ef4_msi_context - Context for each MSI * @efx: The associated NIC |
