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219 lines
5.5 KiB
219 lines
5.5 KiB
/* |
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* Copyright 2008-2010 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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* This program is free software; you may redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; version 2 of the License. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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*/ |
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#ifndef _VNIC_RQ_H_ |
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#define _VNIC_RQ_H_ |
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#include <linux/pci.h> |
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#include <linux/netdevice.h> |
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#include "vnic_dev.h" |
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#include "vnic_cq.h" |
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/* Receive queue control */ |
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struct vnic_rq_ctrl { |
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u64 ring_base; /* 0x00 */ |
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u32 ring_size; /* 0x08 */ |
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u32 pad0; |
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u32 posted_index; /* 0x10 */ |
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u32 pad1; |
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u32 cq_index; /* 0x18 */ |
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u32 pad2; |
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u32 enable; /* 0x20 */ |
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u32 pad3; |
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u32 running; /* 0x28 */ |
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u32 pad4; |
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u32 fetch_index; /* 0x30 */ |
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u32 pad5; |
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u32 error_interrupt_enable; /* 0x38 */ |
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u32 pad6; |
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u32 error_interrupt_offset; /* 0x40 */ |
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u32 pad7; |
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u32 error_status; /* 0x48 */ |
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u32 pad8; |
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u32 dropped_packet_count; /* 0x50 */ |
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u32 pad9; |
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u32 dropped_packet_count_rc; /* 0x58 */ |
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u32 pad10; |
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}; |
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/* Break the vnic_rq_buf allocations into blocks of 32/64 entries */ |
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#define VNIC_RQ_BUF_MIN_BLK_ENTRIES 32 |
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#define VNIC_RQ_BUF_DFLT_BLK_ENTRIES 64 |
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#define VNIC_RQ_BUF_BLK_ENTRIES(entries) \ |
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((unsigned int)((entries < VNIC_RQ_BUF_DFLT_BLK_ENTRIES) ? \ |
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VNIC_RQ_BUF_MIN_BLK_ENTRIES : VNIC_RQ_BUF_DFLT_BLK_ENTRIES)) |
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#define VNIC_RQ_BUF_BLK_SZ(entries) \ |
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(VNIC_RQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_rq_buf)) |
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#define VNIC_RQ_BUF_BLKS_NEEDED(entries) \ |
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DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES(entries)) |
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#define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096) |
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struct vnic_rq_buf { |
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struct vnic_rq_buf *next; |
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dma_addr_t dma_addr; |
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void *os_buf; |
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unsigned int os_buf_index; |
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unsigned int len; |
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unsigned int index; |
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void *desc; |
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uint64_t wr_id; |
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}; |
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enum enic_poll_state { |
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ENIC_POLL_STATE_IDLE, |
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ENIC_POLL_STATE_NAPI, |
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ENIC_POLL_STATE_POLL |
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}; |
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struct vnic_rq { |
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unsigned int index; |
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struct vnic_dev *vdev; |
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struct vnic_rq_ctrl __iomem *ctrl; /* memory-mapped */ |
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struct vnic_dev_ring ring; |
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struct vnic_rq_buf *bufs[VNIC_RQ_BUF_BLKS_MAX]; |
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struct vnic_rq_buf *to_use; |
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struct vnic_rq_buf *to_clean; |
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void *os_buf_head; |
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unsigned int pkts_outstanding; |
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}; |
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static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq) |
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{ |
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/* how many does SW own? */ |
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return rq->ring.desc_avail; |
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} |
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static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq) |
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{ |
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/* how many does HW own? */ |
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return rq->ring.desc_count - rq->ring.desc_avail - 1; |
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} |
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static inline void *vnic_rq_next_desc(struct vnic_rq *rq) |
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{ |
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return rq->to_use->desc; |
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} |
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static inline unsigned int vnic_rq_next_index(struct vnic_rq *rq) |
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{ |
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return rq->to_use->index; |
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} |
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static inline void vnic_rq_post(struct vnic_rq *rq, |
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void *os_buf, unsigned int os_buf_index, |
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dma_addr_t dma_addr, unsigned int len, |
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uint64_t wrid) |
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{ |
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struct vnic_rq_buf *buf = rq->to_use; |
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buf->os_buf = os_buf; |
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buf->os_buf_index = os_buf_index; |
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buf->dma_addr = dma_addr; |
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buf->len = len; |
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buf->wr_id = wrid; |
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buf = buf->next; |
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rq->to_use = buf; |
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rq->ring.desc_avail--; |
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/* Move the posted_index every nth descriptor |
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*/ |
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#ifndef VNIC_RQ_RETURN_RATE |
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#define VNIC_RQ_RETURN_RATE 0xf /* keep 2^n - 1 */ |
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#endif |
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if ((buf->index & VNIC_RQ_RETURN_RATE) == 0) { |
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/* Adding write memory barrier prevents compiler and/or CPU |
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* reordering, thus avoiding descriptor posting before |
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* descriptor is initialized. Otherwise, hardware can read |
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* stale descriptor fields. |
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*/ |
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wmb(); |
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iowrite32(buf->index, &rq->ctrl->posted_index); |
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} |
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} |
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static inline void vnic_rq_return_descs(struct vnic_rq *rq, unsigned int count) |
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{ |
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rq->ring.desc_avail += count; |
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} |
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enum desc_return_options { |
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VNIC_RQ_RETURN_DESC, |
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VNIC_RQ_DEFER_RETURN_DESC, |
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}; |
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static inline void vnic_rq_service(struct vnic_rq *rq, |
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struct cq_desc *cq_desc, u16 completed_index, |
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int desc_return, void (*buf_service)(struct vnic_rq *rq, |
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struct cq_desc *cq_desc, struct vnic_rq_buf *buf, |
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int skipped, void *opaque), void *opaque) |
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{ |
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struct vnic_rq_buf *buf; |
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int skipped; |
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buf = rq->to_clean; |
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while (1) { |
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skipped = (buf->index != completed_index); |
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(*buf_service)(rq, cq_desc, buf, skipped, opaque); |
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if (desc_return == VNIC_RQ_RETURN_DESC) |
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rq->ring.desc_avail++; |
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rq->to_clean = buf->next; |
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if (!skipped) |
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break; |
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buf = rq->to_clean; |
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} |
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} |
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static inline int vnic_rq_fill(struct vnic_rq *rq, |
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int (*buf_fill)(struct vnic_rq *rq)) |
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{ |
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int err; |
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while (vnic_rq_desc_avail(rq) > 0) { |
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err = (*buf_fill)(rq); |
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if (err) |
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return err; |
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} |
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return 0; |
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} |
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void vnic_rq_free(struct vnic_rq *rq); |
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int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, |
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unsigned int desc_count, unsigned int desc_size); |
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void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, |
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unsigned int error_interrupt_enable, |
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unsigned int error_interrupt_offset); |
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unsigned int vnic_rq_error_status(struct vnic_rq *rq); |
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void vnic_rq_enable(struct vnic_rq *rq); |
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int vnic_rq_disable(struct vnic_rq *rq); |
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void vnic_rq_clean(struct vnic_rq *rq, |
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void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)); |
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#endif /* _VNIC_RQ_H_ */
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