101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman/* 229046f9b1e36f6e3332ce2d8e366005fd177b37aVasanthy Kolluri * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved. 301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * Copyright 2007 Nuova Systems, Inc. All rights reserved. 401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * 501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * This program is free software; you may redistribute it and/or modify 601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * it under the terms of the GNU General Public License as published by 701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * the Free Software Foundation; version 2 of the License. 801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * 901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 1001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 1101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 1201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 1301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 1401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 1501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 1601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * SOFTWARE. 1701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman * 1801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman */ 1901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 2001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#ifndef _VNIC_WQ_H_ 2101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#define _VNIC_WQ_H_ 2201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 2301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#include <linux/pci.h> 2401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 2501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#include "vnic_dev.h" 2601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#include "vnic_cq.h" 2701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 2801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman/* Work queue control */ 2901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstruct vnic_wq_ctrl { 3001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u64 ring_base; /* 0x00 */ 3101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 ring_size; /* 0x08 */ 3201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad0; 3301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 posted_index; /* 0x10 */ 3401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad1; 3501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 cq_index; /* 0x18 */ 3601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad2; 3701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 enable; /* 0x20 */ 3801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad3; 3901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 running; /* 0x28 */ 4001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad4; 4101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 fetch_index; /* 0x30 */ 4201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad5; 4301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 dca_value; /* 0x38 */ 4401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad6; 4501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 error_interrupt_enable; /* 0x40 */ 4601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad7; 4701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 error_interrupt_offset; /* 0x48 */ 4801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad8; 4901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 error_status; /* 0x50 */ 5001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman u32 pad9; 5101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman}; 5201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 5301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstruct vnic_wq_buf { 5401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_buf *next; 5501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman dma_addr_t dma_addr; 5601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman void *os_buf; 5701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int len; 5801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int index; 5901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman int sop; 6001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman void *desc; 6101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman}; 6201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 63b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri/* Break the vnic_wq_buf allocations into blocks of 32/64 entries */ 64b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri#define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32 65b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri#define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64 66b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri#define VNIC_WQ_BUF_BLK_ENTRIES(entries) \ 67b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri ((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \ 68b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES)) 69b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri#define VNIC_WQ_BUF_BLK_SZ(entries) \ 70b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri (VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf)) 7101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ 72b5bab85c15ed3d1ae7f917a7c077086ac6c04572Vasanthy Kolluri DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries)) 7301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096) 7401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 7501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstruct vnic_wq { 7601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int index; 7701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_dev *vdev; 7801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */ 7901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_dev_ring ring; 8001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX]; 8101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_buf *to_use; 8201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_buf *to_clean; 8301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int pkts_outstanding; 8401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman}; 8501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 8601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstatic inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq) 8701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman{ 8801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman /* how many does SW own? */ 8901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman return wq->ring.desc_avail; 9001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman} 9101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 9201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstatic inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq) 9301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman{ 9401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman /* how many does HW own? */ 9501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman return wq->ring.desc_count - wq->ring.desc_avail - 1; 9601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman} 9701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 9801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstatic inline void *vnic_wq_next_desc(struct vnic_wq *wq) 9901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman{ 10001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman return wq->to_use->desc; 10101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman} 10201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 10301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstatic inline void vnic_wq_post(struct vnic_wq *wq, 10401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman void *os_buf, dma_addr_t dma_addr, 10501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int len, int sop, int eop) 10601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman{ 10701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_buf *buf = wq->to_use; 10801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 10901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf->sop = sop; 11001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf->os_buf = eop ? os_buf : NULL; 11101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf->dma_addr = dma_addr; 11201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf->len = len; 11301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 11401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf = buf->next; 115845964515a76381e204d3399af82c149f8abcc1cScott Feldman if (eop) { 116845964515a76381e204d3399af82c149f8abcc1cScott Feldman /* Adding write memory barrier prevents compiler and/or CPU 117845964515a76381e204d3399af82c149f8abcc1cScott Feldman * reordering, thus avoiding descriptor posting before 118845964515a76381e204d3399af82c149f8abcc1cScott Feldman * descriptor is initialized. Otherwise, hardware can read 119845964515a76381e204d3399af82c149f8abcc1cScott Feldman * stale descriptor fields. 120845964515a76381e204d3399af82c149f8abcc1cScott Feldman */ 121845964515a76381e204d3399af82c149f8abcc1cScott Feldman wmb(); 12201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman iowrite32(buf->index, &wq->ctrl->posted_index); 123845964515a76381e204d3399af82c149f8abcc1cScott Feldman } 12401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman wq->to_use = buf; 12501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 12601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman wq->ring.desc_avail--; 12701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman} 12801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 12901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanstatic inline void vnic_wq_service(struct vnic_wq *wq, 13001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct cq_desc *cq_desc, u16 completed_index, 13101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman void (*buf_service)(struct vnic_wq *wq, 13201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque), 13301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman void *opaque) 13401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman{ 13501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman struct vnic_wq_buf *buf; 13601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 13701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf = wq->to_clean; 13801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman while (1) { 13901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 14001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman (*buf_service)(wq, cq_desc, buf, opaque); 14101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 14201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman wq->ring.desc_avail++; 14301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 14401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman wq->to_clean = buf->next; 14501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 14601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman if (buf->index == completed_index) 14701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman break; 14801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 14901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman buf = wq->to_clean; 15001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman } 15101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman} 15201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 15301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanvoid vnic_wq_free(struct vnic_wq *wq); 15401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanint vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 15501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int desc_count, unsigned int desc_size); 15601f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanvoid vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 15701f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int error_interrupt_enable, 15801f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman unsigned int error_interrupt_offset); 15901f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanunsigned int vnic_wq_error_status(struct vnic_wq *wq); 16001f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanvoid vnic_wq_enable(struct vnic_wq *wq); 16101f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanint vnic_wq_disable(struct vnic_wq *wq); 16201f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldmanvoid vnic_wq_clean(struct vnic_wq *wq, 16301f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)); 16401f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman 16501f2e4ead2c51226ed1283ef6a8388ca6f4cff8fScott Feldman#endif /* _VNIC_WQ_H_ */ 166