can的filter_item和msg如何重定义一个字段并进行补充呢

你好，在做can的设计用，发现使用其定义的结构有些信息没定义上，还有个同一个名hdr，有两种意义，我们重定义了一下，请参考：

can.h中

struct rt_can_filter_item
{
rt_uint32_t id : 29;
rt_uint32_t ide : 1;
rt_uint32_t rtr : 1;
rt_uint32_t mode : 1;
rt_uint32_t mask;
rt_uint32_t rxfifo;//---------------增加一个CAN_RX_FIFO0/CAN_RX_FIFO1的配置项
rt_int32_t hdr;//---------------应定义成：rx.FilterBank，应改为 rt_int32_t hdr_bank;
#ifdef RT_CAN_USING_HDR
rt_err_t (*ind)(rt_device_t dev, void *args , rt_int32_t hdr, rt_size_t size);
void *args;
#endif /RT_CAN_USING_HDR/
};
struct rt_can_msg
{
rt_uint32_t id : 29;
rt_uint32_t ide : 1;
rt_uint32_t rtr : 1;
rt_uint32_t rsv : 1;
rt_uint32_t len : 8;
rt_uint32_t priv : 8;
rt_int32_t hdr : 8;//------------重定义为返回的： rx.FilterMatchIndex，应改为：rt_int32_t hdr_index : 8;
rt_uint32_t reserved : 8;//------------重定义为返回的：CAN_RX_FIFO0/CAN_RX_FIFO1，应改为：rt_uint32_t rxfifo : 8;
rt_uint8_t data[8];
};
drv_can.c中

static rt_err_t _can_control(struct rt_can_device can, int cmd, void arg)
{
//......
case RT_CAN_CMD_SET_FILTER:
//......
drv_can->FilterConfig.FilterFIFOAssignment = filter_cfg->items[i].rxfifo;//------------新增一条：rxfifo = CAN_RX_FIFO0/CAN_RX_FIFO1的配置项
//......
}
static int _can_recvmsg(struct rt_can_device can, void buf, rt_uint32_t fifo)//-------------应叫rxfifo
{
//......
pmsg->reserved = fifo;//----------增加一条返回的：rxfifo = CAN_RX_FIFO0/CAN_RX_FIFO1
/* get len /
pmsg->len = rxheader.DLC;
/ get hdr */
if (hcan->Instance == CAN1)
{
//pmsg->hdr = (rxheader.FilterMatchIndex + 1) >> 1;//-------------去掉
pmsg->hdr = rxheader.FilterMatchIndex;//--------------增加一条返回的：过滤索引
}
#ifdef CAN2
else if (hcan->Instance == CAN2)
{
//pmsg->hdr = (rxheader.FilterMatchIndex >> 1) + 14;//-------------去掉
pmsg->hdr = rxheader.FilterMatchIndex;//--------------增加一条返回的：过滤索引
}
#endif
//......
return RT_EOK;
}