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https://github.com/freebsd/freebsd-src
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9c067b844f
This driver is based of the enic (Cisco VIC) DPDK driver. It provides basic ethernet functionality. Has been run with various VIC cards to do UEFI PXE boot with NFS root.
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2008-2017 Cisco Systems, Inc. All rights reserved.
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* Copyright 2007 Nuova Systems, Inc. All rights reserved.
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*/
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#ifndef _CQ_DESC_H_
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#define _CQ_DESC_H_
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/*
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* Completion queue descriptor types
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*/
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enum cq_desc_types {
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CQ_DESC_TYPE_WQ_ENET = 0,
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CQ_DESC_TYPE_DESC_COPY = 1,
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CQ_DESC_TYPE_WQ_EXCH = 2,
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CQ_DESC_TYPE_RQ_ENET = 3,
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CQ_DESC_TYPE_RQ_FCP = 4,
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CQ_DESC_TYPE_IOMMU_MISS = 5,
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CQ_DESC_TYPE_SGL = 6,
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CQ_DESC_TYPE_CLASSIFIER = 7,
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CQ_DESC_TYPE_TEST = 127,
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};
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/* Completion queue descriptor: 16B
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*
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* All completion queues have this basic layout. The
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* type_specfic area is unique for each completion
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* queue type.
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*/
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struct cq_desc {
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__le16 completed_index;
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__le16 q_number;
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u8 type_specfic[11];
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u8 type_color;
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};
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#define CQ_DESC_TYPE_BITS 4
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#define CQ_DESC_TYPE_MASK ((1 << CQ_DESC_TYPE_BITS) - 1)
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#define CQ_DESC_COLOR_MASK 1
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#define CQ_DESC_COLOR_SHIFT 7
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#define CQ_DESC_COLOR_MASK_NOSHIFT 0x80
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#define CQ_DESC_Q_NUM_BITS 10
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#define CQ_DESC_Q_NUM_MASK ((1 << CQ_DESC_Q_NUM_BITS) - 1)
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#define CQ_DESC_COMP_NDX_BITS 12
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#define CQ_DESC_COMP_NDX_MASK ((1 << CQ_DESC_COMP_NDX_BITS) - 1)
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static inline void cq_color_enc(struct cq_desc *desc, const u8 color)
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{
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if (color)
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desc->type_color |= (1 << CQ_DESC_COLOR_SHIFT);
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else
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desc->type_color &= ~(1 << CQ_DESC_COLOR_SHIFT);
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}
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static inline void cq_desc_enc(struct cq_desc *desc,
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const u8 type, const u8 color, const u16 q_number,
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const u16 completed_index)
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{
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desc->type_color = (type & CQ_DESC_TYPE_MASK) |
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((color & CQ_DESC_COLOR_MASK) << CQ_DESC_COLOR_SHIFT);
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desc->q_number = cpu_to_le16(q_number & CQ_DESC_Q_NUM_MASK);
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desc->completed_index = cpu_to_le16(completed_index &
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CQ_DESC_COMP_NDX_MASK);
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}
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static inline void cq_desc_dec(const struct cq_desc *desc_arg,
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u8 *type, u8 *color, u16 *q_number, u16 *completed_index)
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{
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const struct cq_desc *desc = desc_arg;
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const u8 type_color = desc->type_color;
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*color = (type_color >> CQ_DESC_COLOR_SHIFT) & CQ_DESC_COLOR_MASK;
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/*
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* Make sure color bit is read from desc *before* other fields
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* are read from desc. Hardware guarantees color bit is last
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* bit (byte) written. Adding the rmb() prevents the compiler
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* and/or CPU from reordering the reads which would potentially
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* result in reading stale values.
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*/
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rmb();
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*type = type_color & CQ_DESC_TYPE_MASK;
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*q_number = le16_to_cpu(desc->q_number) & CQ_DESC_Q_NUM_MASK;
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*completed_index = le16_to_cpu(desc->completed_index) &
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CQ_DESC_COMP_NDX_MASK;
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}
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static inline void cq_color_dec(const struct cq_desc *desc_arg, u8 *color)
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{
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volatile const struct cq_desc *desc = desc_arg;
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*color = (desc->type_color >> CQ_DESC_COLOR_SHIFT) & CQ_DESC_COLOR_MASK;
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}
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#endif /* _CQ_DESC_H_ */
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