540 lines
13 KiB
C
540 lines
13 KiB
C
/* QLogic qed NIC Driver
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* Copyright (c) 2015 QLogic Corporation
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*
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* This software is available under the terms of the GNU General Public License
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* (GPL) Version 2, available from the file COPYING in the main directory of
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* this source tree.
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*/
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#ifndef _QED_CHAIN_H
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#define _QED_CHAIN_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/qed/common_hsi.h>
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/* dma_addr_t manip */
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#define DMA_LO_LE(x) cpu_to_le32(lower_32_bits(x))
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#define DMA_HI_LE(x) cpu_to_le32(upper_32_bits(x))
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#define HILO_GEN(hi, lo, type) ((((type)(hi)) << 32) + (lo))
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#define HILO_DMA(hi, lo) HILO_GEN(hi, lo, dma_addr_t)
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#define HILO_64(hi, lo) HILO_GEN((le32_to_cpu(hi)), (le32_to_cpu(lo)), u64)
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#define HILO_DMA_REGPAIR(regpair) (HILO_DMA(regpair.hi, regpair.lo))
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#define HILO_64_REGPAIR(regpair) (HILO_64(regpair.hi, regpair.lo))
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enum qed_chain_mode {
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/* Each Page contains a next pointer at its end */
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QED_CHAIN_MODE_NEXT_PTR,
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/* Chain is a single page (next ptr) is unrequired */
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QED_CHAIN_MODE_SINGLE,
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/* Page pointers are located in a side list */
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QED_CHAIN_MODE_PBL,
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};
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enum qed_chain_use_mode {
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QED_CHAIN_USE_TO_PRODUCE, /* Chain starts empty */
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QED_CHAIN_USE_TO_CONSUME, /* Chain starts full */
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QED_CHAIN_USE_TO_CONSUME_PRODUCE, /* Chain starts empty */
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};
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struct qed_chain_next {
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struct regpair next_phys;
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void *next_virt;
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};
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struct qed_chain_pbl {
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dma_addr_t p_phys_table;
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void *p_virt_table;
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u16 prod_page_idx;
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u16 cons_page_idx;
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};
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struct qed_chain {
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void *p_virt_addr;
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dma_addr_t p_phys_addr;
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void *p_prod_elem;
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void *p_cons_elem;
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u16 page_cnt;
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enum qed_chain_mode mode;
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enum qed_chain_use_mode intended_use; /* used to produce/consume */
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u16 capacity; /*< number of _usable_ elements */
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u16 size; /* number of elements */
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u16 prod_idx;
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u16 cons_idx;
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u16 elem_per_page;
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u16 elem_per_page_mask;
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u16 elem_unusable;
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u16 usable_per_page;
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u16 elem_size;
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u16 next_page_mask;
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struct qed_chain_pbl pbl;
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};
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#define QED_CHAIN_PBL_ENTRY_SIZE (8)
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#define QED_CHAIN_PAGE_SIZE (0x1000)
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#define ELEMS_PER_PAGE(elem_size) (QED_CHAIN_PAGE_SIZE / (elem_size))
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#define UNUSABLE_ELEMS_PER_PAGE(elem_size, mode) \
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((mode == QED_CHAIN_MODE_NEXT_PTR) ? \
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(1 + ((sizeof(struct qed_chain_next) - 1) / \
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(elem_size))) : 0)
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#define USABLE_ELEMS_PER_PAGE(elem_size, mode) \
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((u32)(ELEMS_PER_PAGE(elem_size) - \
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UNUSABLE_ELEMS_PER_PAGE(elem_size, mode)))
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#define QED_CHAIN_PAGE_CNT(elem_cnt, elem_size, mode) \
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DIV_ROUND_UP(elem_cnt, USABLE_ELEMS_PER_PAGE(elem_size, mode))
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/* Accessors */
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static inline u16 qed_chain_get_prod_idx(struct qed_chain *p_chain)
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{
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return p_chain->prod_idx;
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}
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static inline u16 qed_chain_get_cons_idx(struct qed_chain *p_chain)
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{
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return p_chain->cons_idx;
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}
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static inline u16 qed_chain_get_elem_left(struct qed_chain *p_chain)
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{
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u16 used;
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/* we don't need to trancate upon assignmet, as we assign u32->u16 */
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used = ((u32)0x10000u + (u32)(p_chain->prod_idx)) -
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(u32)p_chain->cons_idx;
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if (p_chain->mode == QED_CHAIN_MODE_NEXT_PTR)
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used -= (used / p_chain->elem_per_page);
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return p_chain->capacity - used;
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}
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static inline u8 qed_chain_is_full(struct qed_chain *p_chain)
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{
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return qed_chain_get_elem_left(p_chain) == p_chain->capacity;
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}
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static inline u8 qed_chain_is_empty(struct qed_chain *p_chain)
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{
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return qed_chain_get_elem_left(p_chain) == 0;
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}
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static inline u16 qed_chain_get_elem_per_page(
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struct qed_chain *p_chain)
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{
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return p_chain->elem_per_page;
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}
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static inline u16 qed_chain_get_usable_per_page(
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struct qed_chain *p_chain)
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{
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return p_chain->usable_per_page;
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}
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static inline u16 qed_chain_get_unusable_per_page(
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struct qed_chain *p_chain)
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{
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return p_chain->elem_unusable;
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}
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static inline u16 qed_chain_get_size(struct qed_chain *p_chain)
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{
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return p_chain->size;
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}
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static inline dma_addr_t
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qed_chain_get_pbl_phys(struct qed_chain *p_chain)
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{
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return p_chain->pbl.p_phys_table;
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}
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/**
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* @brief qed_chain_advance_page -
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*
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* Advance the next element accros pages for a linked chain
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*
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* @param p_chain
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* @param p_next_elem
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* @param idx_to_inc
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* @param page_to_inc
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*/
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static inline void
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qed_chain_advance_page(struct qed_chain *p_chain,
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void **p_next_elem,
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u16 *idx_to_inc,
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u16 *page_to_inc)
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{
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switch (p_chain->mode) {
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case QED_CHAIN_MODE_NEXT_PTR:
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{
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struct qed_chain_next *p_next = *p_next_elem;
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*p_next_elem = p_next->next_virt;
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*idx_to_inc += p_chain->elem_unusable;
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break;
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}
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case QED_CHAIN_MODE_SINGLE:
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*p_next_elem = p_chain->p_virt_addr;
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break;
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case QED_CHAIN_MODE_PBL:
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/* It is assumed pages are sequential, next element needs
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* to change only when passing going back to first from last.
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*/
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if (++(*page_to_inc) == p_chain->page_cnt) {
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*page_to_inc = 0;
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*p_next_elem = p_chain->p_virt_addr;
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}
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}
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}
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#define is_unusable_idx(p, idx) \
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(((p)->idx & (p)->elem_per_page_mask) == (p)->usable_per_page)
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#define is_unusable_next_idx(p, idx) \
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((((p)->idx + 1) & (p)->elem_per_page_mask) == (p)->usable_per_page)
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#define test_ans_skip(p, idx) \
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do { \
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if (is_unusable_idx(p, idx)) { \
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(p)->idx += (p)->elem_unusable; \
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} \
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} while (0)
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/**
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* @brief qed_chain_return_multi_produced -
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*
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* A chain in which the driver "Produces" elements should use this API
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* to indicate previous produced elements are now consumed.
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*
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* @param p_chain
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* @param num
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*/
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static inline void
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qed_chain_return_multi_produced(struct qed_chain *p_chain,
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u16 num)
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{
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p_chain->cons_idx += num;
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test_ans_skip(p_chain, cons_idx);
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}
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/**
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* @brief qed_chain_return_produced -
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*
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* A chain in which the driver "Produces" elements should use this API
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* to indicate previous produced elements are now consumed.
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*
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* @param p_chain
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*/
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static inline void qed_chain_return_produced(struct qed_chain *p_chain)
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{
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p_chain->cons_idx++;
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test_ans_skip(p_chain, cons_idx);
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}
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/**
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* @brief qed_chain_produce -
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*
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* A chain in which the driver "Produces" elements should use this to get
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* a pointer to the next element which can be "Produced". It's driver
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* responsibility to validate that the chain has room for new element.
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*
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* @param p_chain
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*
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* @return void*, a pointer to next element
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*/
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static inline void *qed_chain_produce(struct qed_chain *p_chain)
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{
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void *ret = NULL;
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if ((p_chain->prod_idx & p_chain->elem_per_page_mask) ==
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p_chain->next_page_mask) {
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qed_chain_advance_page(p_chain, &p_chain->p_prod_elem,
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&p_chain->prod_idx,
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&p_chain->pbl.prod_page_idx);
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}
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ret = p_chain->p_prod_elem;
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p_chain->prod_idx++;
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p_chain->p_prod_elem = (void *)(((u8 *)p_chain->p_prod_elem) +
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p_chain->elem_size);
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return ret;
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}
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/**
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* @brief qed_chain_get_capacity -
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*
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* Get the maximum number of BDs in chain
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*
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* @param p_chain
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* @param num
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*
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* @return u16, number of unusable BDs
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*/
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static inline u16 qed_chain_get_capacity(struct qed_chain *p_chain)
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{
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return p_chain->capacity;
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}
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/**
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* @brief qed_chain_recycle_consumed -
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*
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* Returns an element which was previously consumed;
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* Increments producers so they could be written to FW.
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*
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* @param p_chain
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*/
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static inline void
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qed_chain_recycle_consumed(struct qed_chain *p_chain)
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{
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test_ans_skip(p_chain, prod_idx);
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p_chain->prod_idx++;
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}
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/**
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* @brief qed_chain_consume -
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*
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* A Chain in which the driver utilizes data written by a different source
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* (i.e., FW) should use this to access passed buffers.
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*
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* @param p_chain
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*
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* @return void*, a pointer to the next buffer written
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*/
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static inline void *qed_chain_consume(struct qed_chain *p_chain)
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{
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void *ret = NULL;
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if ((p_chain->cons_idx & p_chain->elem_per_page_mask) ==
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p_chain->next_page_mask) {
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qed_chain_advance_page(p_chain, &p_chain->p_cons_elem,
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&p_chain->cons_idx,
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&p_chain->pbl.cons_page_idx);
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}
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ret = p_chain->p_cons_elem;
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p_chain->cons_idx++;
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p_chain->p_cons_elem = (void *)(((u8 *)p_chain->p_cons_elem) +
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p_chain->elem_size);
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return ret;
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}
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/**
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* @brief qed_chain_reset - Resets the chain to its start state
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*
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* @param p_chain pointer to a previously allocted chain
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*/
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static inline void qed_chain_reset(struct qed_chain *p_chain)
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{
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int i;
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p_chain->prod_idx = 0;
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p_chain->cons_idx = 0;
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p_chain->p_cons_elem = p_chain->p_virt_addr;
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p_chain->p_prod_elem = p_chain->p_virt_addr;
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if (p_chain->mode == QED_CHAIN_MODE_PBL) {
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p_chain->pbl.prod_page_idx = p_chain->page_cnt - 1;
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p_chain->pbl.cons_page_idx = p_chain->page_cnt - 1;
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}
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switch (p_chain->intended_use) {
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case QED_CHAIN_USE_TO_CONSUME_PRODUCE:
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case QED_CHAIN_USE_TO_PRODUCE:
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/* Do nothing */
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break;
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case QED_CHAIN_USE_TO_CONSUME:
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/* produce empty elements */
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for (i = 0; i < p_chain->capacity; i++)
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qed_chain_recycle_consumed(p_chain);
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break;
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}
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}
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/**
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* @brief qed_chain_init - Initalizes a basic chain struct
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*
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* @param p_chain
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* @param p_virt_addr
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* @param p_phys_addr physical address of allocated buffer's beginning
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* @param page_cnt number of pages in the allocated buffer
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* @param elem_size size of each element in the chain
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* @param intended_use
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* @param mode
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*/
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static inline void qed_chain_init(struct qed_chain *p_chain,
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void *p_virt_addr,
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dma_addr_t p_phys_addr,
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u16 page_cnt,
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u8 elem_size,
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enum qed_chain_use_mode intended_use,
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enum qed_chain_mode mode)
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{
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/* chain fixed parameters */
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p_chain->p_virt_addr = p_virt_addr;
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p_chain->p_phys_addr = p_phys_addr;
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p_chain->elem_size = elem_size;
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p_chain->page_cnt = page_cnt;
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p_chain->mode = mode;
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p_chain->intended_use = intended_use;
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p_chain->elem_per_page = ELEMS_PER_PAGE(elem_size);
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p_chain->usable_per_page =
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USABLE_ELEMS_PER_PAGE(elem_size, mode);
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p_chain->capacity = p_chain->usable_per_page * page_cnt;
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p_chain->size = p_chain->elem_per_page * page_cnt;
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p_chain->elem_per_page_mask = p_chain->elem_per_page - 1;
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p_chain->elem_unusable = UNUSABLE_ELEMS_PER_PAGE(elem_size, mode);
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p_chain->next_page_mask = (p_chain->usable_per_page &
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p_chain->elem_per_page_mask);
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if (mode == QED_CHAIN_MODE_NEXT_PTR) {
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struct qed_chain_next *p_next;
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u16 i;
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for (i = 0; i < page_cnt - 1; i++) {
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/* Increment mem_phy to the next page. */
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p_phys_addr += QED_CHAIN_PAGE_SIZE;
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/* Initialize the physical address of the next page. */
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p_next = (struct qed_chain_next *)((u8 *)p_virt_addr +
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elem_size *
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p_chain->
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usable_per_page);
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p_next->next_phys.lo = DMA_LO_LE(p_phys_addr);
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p_next->next_phys.hi = DMA_HI_LE(p_phys_addr);
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/* Initialize the virtual address of the next page. */
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p_next->next_virt = (void *)((u8 *)p_virt_addr +
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QED_CHAIN_PAGE_SIZE);
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/* Move to the next page. */
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p_virt_addr = p_next->next_virt;
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}
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/* Last page's next should point to beginning of the chain */
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p_next = (struct qed_chain_next *)((u8 *)p_virt_addr +
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elem_size *
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p_chain->usable_per_page);
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p_next->next_phys.lo = DMA_LO_LE(p_chain->p_phys_addr);
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p_next->next_phys.hi = DMA_HI_LE(p_chain->p_phys_addr);
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p_next->next_virt = p_chain->p_virt_addr;
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}
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qed_chain_reset(p_chain);
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}
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/**
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* @brief qed_chain_pbl_init - Initalizes a basic pbl chain
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* struct
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* @param p_chain
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* @param p_virt_addr virtual address of allocated buffer's beginning
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* @param p_phys_addr physical address of allocated buffer's beginning
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* @param page_cnt number of pages in the allocated buffer
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* @param elem_size size of each element in the chain
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* @param use_mode
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* @param p_phys_pbl pointer to a pre-allocated side table
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* which will hold physical page addresses.
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* @param p_virt_pbl pointer to a pre allocated side table
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* which will hold virtual page addresses.
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*/
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static inline void
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qed_chain_pbl_init(struct qed_chain *p_chain,
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void *p_virt_addr,
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dma_addr_t p_phys_addr,
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u16 page_cnt,
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u8 elem_size,
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enum qed_chain_use_mode use_mode,
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dma_addr_t p_phys_pbl,
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dma_addr_t *p_virt_pbl)
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{
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dma_addr_t *p_pbl_dma = p_virt_pbl;
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int i;
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qed_chain_init(p_chain, p_virt_addr, p_phys_addr, page_cnt,
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elem_size, use_mode, QED_CHAIN_MODE_PBL);
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p_chain->pbl.p_phys_table = p_phys_pbl;
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p_chain->pbl.p_virt_table = p_virt_pbl;
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/* Fill the PBL with physical addresses*/
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for (i = 0; i < page_cnt; i++) {
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*p_pbl_dma = p_phys_addr;
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p_phys_addr += QED_CHAIN_PAGE_SIZE;
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p_pbl_dma++;
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}
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}
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/**
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* @brief qed_chain_set_prod - sets the prod to the given
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* value
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*
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* @param prod_idx
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* @param p_prod_elem
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*/
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static inline void qed_chain_set_prod(struct qed_chain *p_chain,
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u16 prod_idx,
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void *p_prod_elem)
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{
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p_chain->prod_idx = prod_idx;
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p_chain->p_prod_elem = p_prod_elem;
|
|
}
|
|
|
|
/**
|
|
* @brief qed_chain_get_elem -
|
|
*
|
|
* get a pointer to an element represented by absolute idx
|
|
*
|
|
* @param p_chain
|
|
* @assumption p_chain->size is a power of 2
|
|
*
|
|
* @return void*, a pointer to next element
|
|
*/
|
|
static inline void *qed_chain_sge_get_elem(struct qed_chain *p_chain,
|
|
u16 idx)
|
|
{
|
|
void *ret = NULL;
|
|
|
|
if (idx >= p_chain->size)
|
|
return NULL;
|
|
|
|
ret = (u8 *)p_chain->p_virt_addr + p_chain->elem_size * idx;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief qed_chain_sge_inc_cons_prod
|
|
*
|
|
* for sge chains, producer isn't increased serially, the ring
|
|
* is expected to be full at all times. Once elements are
|
|
* consumed, they are immediately produced.
|
|
*
|
|
* @param p_chain
|
|
* @param cnt
|
|
*
|
|
* @return inline void
|
|
*/
|
|
static inline void
|
|
qed_chain_sge_inc_cons_prod(struct qed_chain *p_chain,
|
|
u16 cnt)
|
|
{
|
|
p_chain->prod_idx += cnt;
|
|
p_chain->cons_idx += cnt;
|
|
}
|
|
|
|
#endif
|