diff options
Diffstat (limited to 'drivers/net/ethernet/huawei/hinic3/hinic3_queue_common.h')
| -rw-r--r-- | drivers/net/ethernet/huawei/hinic3/hinic3_queue_common.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/net/ethernet/huawei/hinic3/hinic3_queue_common.h b/drivers/net/ethernet/huawei/hinic3/hinic3_queue_common.h new file mode 100644 index 000000000000..ec4cae0a0929 --- /dev/null +++ b/drivers/net/ethernet/huawei/hinic3/hinic3_queue_common.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) Huawei Technologies Co., Ltd. 2025. All rights reserved. */ + +#ifndef _HINIC3_QUEUE_COMMON_H_ +#define _HINIC3_QUEUE_COMMON_H_ + +#include <linux/types.h> + +#include "hinic3_common.h" + +struct hinic3_hwdev; + +struct hinic3_queue_pages { + /* Array of DMA-able pages that actually holds the queue entries. */ + struct hinic3_dma_addr_align *pages; + /* Page size in bytes. */ + u32 page_size; + /* Number of pages, must be power of 2. */ + u16 num_pages; + u8 elem_size_shift; + u8 elem_per_pg_shift; +}; + +void hinic3_queue_pages_init(struct hinic3_queue_pages *qpages, u32 q_depth, + u32 page_size, u32 elem_size); +int hinic3_queue_pages_alloc(struct hinic3_hwdev *hwdev, + struct hinic3_queue_pages *qpages, u32 align); +void hinic3_queue_pages_free(struct hinic3_hwdev *hwdev, + struct hinic3_queue_pages *qpages); + +/* Get pointer to queue entry at the specified index. Index does not have to be + * masked to queue depth, only least significant bits will be used. Also + * provides remaining elements in same page (including the first one) in case + * caller needs multiple entries. + */ +static inline void *get_q_element(const struct hinic3_queue_pages *qpages, + u32 idx, u32 *remaining_in_page) +{ + const struct hinic3_dma_addr_align *page; + u32 page_idx, elem_idx, elem_per_pg, ofs; + u8 shift; + + shift = qpages->elem_per_pg_shift; + page_idx = (idx >> shift) & (qpages->num_pages - 1); + elem_per_pg = 1 << shift; + elem_idx = idx & (elem_per_pg - 1); + if (remaining_in_page) + *remaining_in_page = elem_per_pg - elem_idx; + ofs = elem_idx << qpages->elem_size_shift; + page = qpages->pages + page_idx; + return (char *)page->align_vaddr + ofs; +} + +#endif |