1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
10 #include <linux/pci.h>
11 #include <linux/netdevice.h>
16 /* Receive queue control */
18 u64 ring_base; /* 0x00 */
19 u32 ring_size; /* 0x08 */
21 u32 posted_index; /* 0x10 */
23 u32 cq_index; /* 0x18 */
25 u32 enable; /* 0x20 */
27 u32 running; /* 0x28 */
29 u32 fetch_index; /* 0x30 */
31 u32 error_interrupt_enable; /* 0x38 */
33 u32 error_interrupt_offset; /* 0x40 */
35 u32 error_status; /* 0x48 */
37 u32 dropped_packet_count; /* 0x50 */
39 u32 dropped_packet_count_rc; /* 0x58 */
43 /* Break the vnic_rq_buf allocations into blocks of 32/64 entries */
44 #define VNIC_RQ_BUF_MIN_BLK_ENTRIES 32
45 #define VNIC_RQ_BUF_DFLT_BLK_ENTRIES 64
46 #define VNIC_RQ_BUF_BLK_ENTRIES(entries) \
47 ((unsigned int)((entries < VNIC_RQ_BUF_DFLT_BLK_ENTRIES) ? \
48 VNIC_RQ_BUF_MIN_BLK_ENTRIES : VNIC_RQ_BUF_DFLT_BLK_ENTRIES))
49 #define VNIC_RQ_BUF_BLK_SZ(entries) \
50 (VNIC_RQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_rq_buf))
51 #define VNIC_RQ_BUF_BLKS_NEEDED(entries) \
52 DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES(entries))
53 #define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096)
56 struct vnic_rq_buf *next;
59 unsigned int os_buf_index;
66 enum enic_poll_state {
74 struct vnic_dev *vdev;
75 struct vnic_rq_ctrl __iomem *ctrl; /* memory-mapped */
76 struct vnic_dev_ring ring;
77 struct vnic_rq_buf *bufs[VNIC_RQ_BUF_BLKS_MAX];
78 struct vnic_rq_buf *to_use;
79 struct vnic_rq_buf *to_clean;
81 unsigned int pkts_outstanding;
84 static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq)
86 /* how many does SW own? */
87 return rq->ring.desc_avail;
90 static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq)
92 /* how many does HW own? */
93 return rq->ring.desc_count - rq->ring.desc_avail - 1;
96 static inline void *vnic_rq_next_desc(struct vnic_rq *rq)
98 return rq->to_use->desc;
101 static inline unsigned int vnic_rq_next_index(struct vnic_rq *rq)
103 return rq->to_use->index;
106 static inline void vnic_rq_post(struct vnic_rq *rq,
107 void *os_buf, unsigned int os_buf_index,
108 dma_addr_t dma_addr, unsigned int len,
111 struct vnic_rq_buf *buf = rq->to_use;
113 buf->os_buf = os_buf;
114 buf->os_buf_index = os_buf_index;
115 buf->dma_addr = dma_addr;
121 rq->ring.desc_avail--;
123 /* Move the posted_index every nth descriptor
126 #ifndef VNIC_RQ_RETURN_RATE
127 #define VNIC_RQ_RETURN_RATE 0xf /* keep 2^n - 1 */
130 if ((buf->index & VNIC_RQ_RETURN_RATE) == 0) {
131 /* Adding write memory barrier prevents compiler and/or CPU
132 * reordering, thus avoiding descriptor posting before
133 * descriptor is initialized. Otherwise, hardware can read
134 * stale descriptor fields.
137 iowrite32(buf->index, &rq->ctrl->posted_index);
141 static inline void vnic_rq_return_descs(struct vnic_rq *rq, unsigned int count)
143 rq->ring.desc_avail += count;
146 enum desc_return_options {
148 VNIC_RQ_DEFER_RETURN_DESC,
151 static inline void vnic_rq_service(struct vnic_rq *rq,
152 struct cq_desc *cq_desc, u16 completed_index,
153 int desc_return, void (*buf_service)(struct vnic_rq *rq,
154 struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
155 int skipped, void *opaque), void *opaque)
157 struct vnic_rq_buf *buf;
163 skipped = (buf->index != completed_index);
165 (*buf_service)(rq, cq_desc, buf, skipped, opaque);
167 if (desc_return == VNIC_RQ_RETURN_DESC)
168 rq->ring.desc_avail++;
170 rq->to_clean = buf->next;
179 static inline int vnic_rq_fill(struct vnic_rq *rq,
180 int (*buf_fill)(struct vnic_rq *rq))
184 while (vnic_rq_desc_avail(rq) > 0) {
186 err = (*buf_fill)(rq);
194 void vnic_rq_free(struct vnic_rq *rq);
195 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
196 unsigned int desc_count, unsigned int desc_size);
197 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
198 unsigned int error_interrupt_enable,
199 unsigned int error_interrupt_offset);
200 unsigned int vnic_rq_error_status(struct vnic_rq *rq);
201 void vnic_rq_enable(struct vnic_rq *rq);
202 int vnic_rq_disable(struct vnic_rq *rq);
203 void vnic_rq_clean(struct vnic_rq *rq,
204 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf));
206 #endif /* _VNIC_RQ_H_ */