diff options
| author | David Jander <david@protonic.nl> | 2014-10-10 17:30:10 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2017-02-06 15:13:23 +0100 |
| commit | d254586c34538c0014280806c5d4795697cf21e5 (patch) | |
| tree | ecce05b11eb440dc8bfc211de75304cd977ebbf9 /include | |
| parent | bd092ad1463ca0990581fa992e12a9b0ed295d25 (diff) | |
can: rx-offload: Add support for HW fifo based irq offloading
Some CAN controllers have a usable FIFO already but can still benefit
from off-loading the CAN controller FIFO. The CAN frames of the FIFO are
read and put into a skb queue during interrupt and then transmitted in a
NAPI context.
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/can/rx-offload.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/can/rx-offload.h b/include/linux/can/rx-offload.h new file mode 100644 index 000000000000..cadfe9869600 --- /dev/null +++ b/include/linux/can/rx-offload.h @@ -0,0 +1,51 @@ +/* + * linux/can/rx-offload.h + * + * Copyright (c) 2014 David Jander, Protonic Holland + * Copyright (c) 2014-2017 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the version 2 of the GNU General Public License + * as published by the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _CAN_RX_OFFLOAD_H +#define _CAN_RX_OFFLOAD_H + +#include <linux/netdevice.h> +#include <linux/can.h> + +struct can_rx_offload { + struct net_device *dev; + + unsigned int (*mailbox_read)(struct can_rx_offload *offload, struct can_frame *cf, unsigned int mb); + + struct sk_buff_head skb_queue; + u32 skb_queue_len_max; + + struct napi_struct napi; +}; + +int can_rx_offload_add_fifo(struct net_device *dev, struct can_rx_offload *offload, unsigned int weight); +int can_rx_offload_irq_offload_fifo(struct can_rx_offload *offload); +int can_rx_offload_irq_queue_err_skb(struct can_rx_offload *offload, struct sk_buff *skb); +void can_rx_offload_reset(struct can_rx_offload *offload); +void can_rx_offload_del(struct can_rx_offload *offload); +void can_rx_offload_enable(struct can_rx_offload *offload); + +static inline void can_rx_offload_schedule(struct can_rx_offload *offload) +{ + napi_schedule(&offload->napi); +} + +static inline void can_rx_offload_disable(struct can_rx_offload *offload) +{ + napi_disable(&offload->napi); +} + +#endif /* !_CAN_RX_OFFLOAD_H */ |