mirror of
https://gitee.com/bianbu-linux/linux-6.6
synced 2025-06-29 23:43:21 -04:00
5fe1be81ef
Save eight bytes of holes on x86-64 architectures by reordering the
members of struct can_priv.
Before:
| $ pahole -C can_priv drivers/net/can/dev/dev.o
| struct can_priv {
| struct net_device * dev; /* 0 8 */
| struct can_device_stats can_stats; /* 8 24 */
| const struct can_bittiming_const * bittiming_const; /* 32 8 */
| const struct can_bittiming_const * data_bittiming_const; /* 40 8 */
| struct can_bittiming bittiming; /* 48 32 */
| /* --- cacheline 1 boundary (64 bytes) was 16 bytes ago --- */
| struct can_bittiming data_bittiming; /* 80 32 */
| const struct can_tdc_const * tdc_const; /* 112 8 */
| struct can_tdc tdc; /* 120 12 */
| /* --- cacheline 2 boundary (128 bytes) was 4 bytes ago --- */
| unsigned int bitrate_const_cnt; /* 132 4 */
| const u32 * bitrate_const; /* 136 8 */
| const u32 * data_bitrate_const; /* 144 8 */
| unsigned int data_bitrate_const_cnt; /* 152 4 */
| u32 bitrate_max; /* 156 4 */
| struct can_clock clock; /* 160 4 */
| unsigned int termination_const_cnt; /* 164 4 */
| const u16 * termination_const; /* 168 8 */
| u16 termination; /* 176 2 */
|
| /* XXX 6 bytes hole, try to pack */
|
| struct gpio_desc * termination_gpio; /* 184 8 */
| /* --- cacheline 3 boundary (192 bytes) --- */
| u16 termination_gpio_ohms[2]; /* 192 4 */
| enum can_state state; /* 196 4 */
| u32 ctrlmode; /* 200 4 */
| u32 ctrlmode_supported; /* 204 4 */
| int restart_ms; /* 208 4 */
|
| /* XXX 4 bytes hole, try to pack */
|
| struct delayed_work restart_work; /* 216 88 */
|
| /* XXX last struct has 4 bytes of padding */
|
| /* --- cacheline 4 boundary (256 bytes) was 48 bytes ago --- */
| int (*do_set_bittiming)(struct net_device *); /* 304 8 */
| int (*do_set_data_bittiming)(struct net_device *); /* 312 8 */
| /* --- cacheline 5 boundary (320 bytes) --- */
| int (*do_set_mode)(struct net_device *, enum can_mode); /* 320 8 */
| int (*do_set_termination)(struct net_device *, u16); /* 328 8 */
| int (*do_get_state)(const struct net_device *, enum can_state *); /* 336 8 */
| int (*do_get_berr_counter)(const struct net_device *, struct can_berr_counter *); /* 344 8 */
| unsigned int echo_skb_max; /* 352 4 */
|
| /* XXX 4 bytes hole, try to pack */
|
| struct sk_buff * * echo_skb; /* 360 8 */
|
| /* size: 368, cachelines: 6, members: 32 */
| /* sum members: 354, holes: 3, sum holes: 14 */
| /* paddings: 1, sum paddings: 4 */
| /* last cacheline: 48 bytes */
| };
After:
| $ pahole -C can_priv drivers/net/can/dev/dev.o
| struct can_priv {
| struct net_device * dev; /* 0 8 */
| struct can_device_stats can_stats; /* 8 24 */
| const struct can_bittiming_const * bittiming_const; /* 32 8 */
| const struct can_bittiming_const * data_bittiming_const; /* 40 8 */
| struct can_bittiming bittiming; /* 48 32 */
| /* --- cacheline 1 boundary (64 bytes) was 16 bytes ago --- */
| struct can_bittiming data_bittiming; /* 80 32 */
| const struct can_tdc_const * tdc_const; /* 112 8 */
| struct can_tdc tdc; /* 120 12 */
| /* --- cacheline 2 boundary (128 bytes) was 4 bytes ago --- */
| unsigned int bitrate_const_cnt; /* 132 4 */
| const u32 * bitrate_const; /* 136 8 */
| const u32 * data_bitrate_const; /* 144 8 */
| unsigned int data_bitrate_const_cnt; /* 152 4 */
| u32 bitrate_max; /* 156 4 */
| struct can_clock clock; /* 160 4 */
| unsigned int termination_const_cnt; /* 164 4 */
| const u16 * termination_const; /* 168 8 */
| u16 termination; /* 176 2 */
|
| /* XXX 6 bytes hole, try to pack */
|
| struct gpio_desc * termination_gpio; /* 184 8 */
| /* --- cacheline 3 boundary (192 bytes) --- */
| u16 termination_gpio_ohms[2]; /* 192 4 */
| unsigned int echo_skb_max; /* 196 4 */
| struct sk_buff * * echo_skb; /* 200 8 */
| enum can_state state; /* 208 4 */
| u32 ctrlmode; /* 212 4 */
| u32 ctrlmode_supported; /* 216 4 */
| int restart_ms; /* 220 4 */
| struct delayed_work restart_work; /* 224 88 */
|
| /* XXX last struct has 4 bytes of padding */
|
| /* --- cacheline 4 boundary (256 bytes) was 56 bytes ago --- */
| int (*do_set_bittiming)(struct net_device *); /* 312 8 */
| /* --- cacheline 5 boundary (320 bytes) --- */
| int (*do_set_data_bittiming)(struct net_device *); /* 320 8 */
| int (*do_set_mode)(struct net_device *, enum can_mode); /* 328 8 */
| int (*do_set_termination)(struct net_device *, u16); /* 336 8 */
| int (*do_get_state)(const struct net_device *, enum can_state *); /* 344 8 */
| int (*do_get_berr_counter)(const struct net_device *, struct can_berr_counter *); /* 352 8 */
|
| /* size: 360, cachelines: 6, members: 32 */
| /* sum members: 354, holes: 1, sum holes: 6 */
| /* paddings: 1, sum paddings: 4 */
| /* last cacheline: 40 bytes */
| };
Link: https://lore.kernel.org/all/20211213160226.56219-4-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
196 lines
5.6 KiB
C
196 lines
5.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/can/dev.h
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*
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* Definitions for the CAN network device driver interface
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*
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* Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com>
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* Varma Electronics Oy
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*
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* Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com>
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*
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*/
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#ifndef _CAN_DEV_H
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#define _CAN_DEV_H
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#include <linux/can.h>
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#include <linux/can/bittiming.h>
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#include <linux/can/error.h>
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#include <linux/can/led.h>
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#include <linux/can/length.h>
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#include <linux/can/netlink.h>
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#include <linux/can/skb.h>
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#include <linux/netdevice.h>
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/*
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* CAN mode
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*/
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enum can_mode {
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CAN_MODE_STOP = 0,
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CAN_MODE_START,
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CAN_MODE_SLEEP
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};
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enum can_termination_gpio {
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CAN_TERMINATION_GPIO_DISABLED = 0,
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CAN_TERMINATION_GPIO_ENABLED,
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CAN_TERMINATION_GPIO_MAX,
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};
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/*
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* CAN common private data
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*/
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struct can_priv {
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struct net_device *dev;
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struct can_device_stats can_stats;
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const struct can_bittiming_const *bittiming_const,
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*data_bittiming_const;
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struct can_bittiming bittiming, data_bittiming;
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const struct can_tdc_const *tdc_const;
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struct can_tdc tdc;
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unsigned int bitrate_const_cnt;
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const u32 *bitrate_const;
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const u32 *data_bitrate_const;
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unsigned int data_bitrate_const_cnt;
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u32 bitrate_max;
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struct can_clock clock;
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unsigned int termination_const_cnt;
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const u16 *termination_const;
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u16 termination;
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struct gpio_desc *termination_gpio;
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u16 termination_gpio_ohms[CAN_TERMINATION_GPIO_MAX];
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unsigned int echo_skb_max;
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struct sk_buff **echo_skb;
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enum can_state state;
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/* CAN controller features - see include/uapi/linux/can/netlink.h */
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u32 ctrlmode; /* current options setting */
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u32 ctrlmode_supported; /* options that can be modified by netlink */
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int restart_ms;
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struct delayed_work restart_work;
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int (*do_set_bittiming)(struct net_device *dev);
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int (*do_set_data_bittiming)(struct net_device *dev);
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int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
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int (*do_set_termination)(struct net_device *dev, u16 term);
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int (*do_get_state)(const struct net_device *dev,
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enum can_state *state);
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int (*do_get_berr_counter)(const struct net_device *dev,
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struct can_berr_counter *bec);
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int (*do_get_auto_tdcv)(const struct net_device *dev, u32 *tdcv);
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#ifdef CONFIG_CAN_LEDS
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struct led_trigger *tx_led_trig;
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char tx_led_trig_name[CAN_LED_NAME_SZ];
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struct led_trigger *rx_led_trig;
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char rx_led_trig_name[CAN_LED_NAME_SZ];
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struct led_trigger *rxtx_led_trig;
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char rxtx_led_trig_name[CAN_LED_NAME_SZ];
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#endif
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};
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static inline bool can_tdc_is_enabled(const struct can_priv *priv)
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{
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return !!(priv->ctrlmode & CAN_CTRLMODE_TDC_MASK);
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}
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/*
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* can_get_relative_tdco() - TDCO relative to the sample point
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*
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* struct can_tdc::tdco represents the absolute offset from TDCV. Some
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* controllers use instead an offset relative to the Sample Point (SP)
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* such that:
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*
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* SSP = TDCV + absolute TDCO
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* = TDCV + SP + relative TDCO
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*
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* -+----------- one bit ----------+-- TX pin
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* |<--- Sample Point --->|
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*
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* --+----------- one bit ----------+-- RX pin
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* |<-------- TDCV -------->|
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* |<------------------------>| absolute TDCO
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* |<--- Sample Point --->|
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* | |<->| relative TDCO
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* |<------------- Secondary Sample Point ------------>|
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*/
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static inline s32 can_get_relative_tdco(const struct can_priv *priv)
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{
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const struct can_bittiming *dbt = &priv->data_bittiming;
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s32 sample_point_in_tc = (CAN_SYNC_SEG + dbt->prop_seg +
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dbt->phase_seg1) * dbt->brp;
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return (s32)priv->tdc.tdco - sample_point_in_tc;
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}
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/* helper to define static CAN controller features at device creation time */
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static inline int __must_check can_set_static_ctrlmode(struct net_device *dev,
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u32 static_mode)
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{
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struct can_priv *priv = netdev_priv(dev);
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/* alloc_candev() succeeded => netdev_priv() is valid at this point */
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if (priv->ctrlmode_supported & static_mode) {
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netdev_warn(dev,
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"Controller features can not be supported and static at the same time\n");
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return -EINVAL;
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}
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priv->ctrlmode = static_mode;
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/* override MTU which was set by default in can_setup()? */
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if (static_mode & CAN_CTRLMODE_FD)
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dev->mtu = CANFD_MTU;
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return 0;
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}
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static inline u32 can_get_static_ctrlmode(struct can_priv *priv)
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{
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return priv->ctrlmode & ~priv->ctrlmode_supported;
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}
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void can_setup(struct net_device *dev);
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struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
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unsigned int txqs, unsigned int rxqs);
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#define alloc_candev(sizeof_priv, echo_skb_max) \
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alloc_candev_mqs(sizeof_priv, echo_skb_max, 1, 1)
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#define alloc_candev_mq(sizeof_priv, echo_skb_max, count) \
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alloc_candev_mqs(sizeof_priv, echo_skb_max, count, count)
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void free_candev(struct net_device *dev);
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/* a candev safe wrapper around netdev_priv */
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struct can_priv *safe_candev_priv(struct net_device *dev);
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int open_candev(struct net_device *dev);
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void close_candev(struct net_device *dev);
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int can_change_mtu(struct net_device *dev, int new_mtu);
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int register_candev(struct net_device *dev);
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void unregister_candev(struct net_device *dev);
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int can_restart_now(struct net_device *dev);
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void can_bus_off(struct net_device *dev);
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const char *can_get_state_str(const enum can_state state);
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void can_change_state(struct net_device *dev, struct can_frame *cf,
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enum can_state tx_state, enum can_state rx_state);
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#ifdef CONFIG_OF
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void of_can_transceiver(struct net_device *dev);
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#else
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static inline void of_can_transceiver(struct net_device *dev) { }
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#endif
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extern struct rtnl_link_ops can_link_ops;
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int can_netlink_register(void);
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void can_netlink_unregister(void);
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#endif /* !_CAN_DEV_H */
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