15df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar/* 25df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * Copyright 2008 Cisco Systems, Inc. All rights reserved. 35df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * Copyright 2007 Nuova Systems, Inc. All rights reserved. 45df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * 55df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * This program is free software; you may redistribute it and/or modify 65df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * it under the terms of the GNU General Public License as published by 75df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * the Free Software Foundation; version 2 of the License. 85df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * 95df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 105df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 115df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 125df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 135df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 145df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 155df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 165df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar * SOFTWARE. 175df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar */ 185df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 195df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar#include <linux/errno.h> 205df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar#include <linux/types.h> 215df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar#include <linux/pci.h> 225df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar#include <linux/delay.h> 235a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 245df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar#include "vnic_dev.h" 255df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar#include "vnic_wq.h" 265df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 275df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarstatic int vnic_wq_alloc_bufs(struct vnic_wq *wq) 285df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 295df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar struct vnic_wq_buf *buf; 305df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar struct vnic_dev *vdev; 315df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int i, j, count = wq->ring.desc_count; 325df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 335df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 345df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar vdev = wq->vdev; 355df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 365df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar for (i = 0; i < blks; i++) { 375df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); 385df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar if (!wq->bufs[i]) { 395df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar printk(KERN_ERR "Failed to alloc wq_bufs\n"); 405df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return -ENOMEM; 415df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 425df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 435df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 445df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar for (i = 0; i < blks; i++) { 455df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf = wq->bufs[i]; 465df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) { 475df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j; 485df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf->desc = (u8 *)wq->ring.descs + 495df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->ring.desc_size * buf->index; 505df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar if (buf->index + 1 == count) { 515df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf->next = wq->bufs[0]; 525df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar break; 535df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) { 545df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf->next = wq->bufs[i + 1]; 555df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } else { 565df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf->next = buf + 1; 575df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf++; 585df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 595df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 605df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 615df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 625df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->to_use = wq->to_clean = wq->bufs[0]; 635df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 645df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return 0; 655df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 665df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 675df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarvoid vnic_wq_free(struct vnic_wq *wq) 685df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 695df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar struct vnic_dev *vdev; 705df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int i; 715df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 725df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar vdev = wq->vdev; 735df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 745df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar vnic_dev_free_desc_ring(vdev, &wq->ring); 755df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 765df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 775df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar kfree(wq->bufs[i]); 785df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->bufs[i] = NULL; 795df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 805df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 815df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->ctrl = NULL; 825df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 835df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 845df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 855df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarint vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 865df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int desc_count, unsigned int desc_size) 875df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 885df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar int err; 895df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 905df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->index = index; 915df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->vdev = vdev; 925df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 935df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); 945df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar if (!wq->ctrl) { 955df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index); 965df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return -EINVAL; 975df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 985df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 995df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar vnic_wq_disable(wq); 1005df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1015df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 1025df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar if (err) 1035df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return err; 1045df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1055df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar err = vnic_wq_alloc_bufs(wq); 1065df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar if (err) { 1075df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar vnic_wq_free(wq); 1085df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return err; 1095df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 1105df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1115df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return 0; 1125df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 1135df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1145df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarvoid vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 1155df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int error_interrupt_enable, 1165df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int error_interrupt_offset) 1175df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 1185df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar u64 paddr; 1195df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1205df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 1215df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar writeq(paddr, &wq->ctrl->ring_base); 1225df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size); 1235df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->fetch_index); 1245df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->posted_index); 1255df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(cq_index, &wq->ctrl->cq_index); 1265df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 1275df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 1285df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->error_status); 1295df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 1305df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1315df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarunsigned int vnic_wq_error_status(struct vnic_wq *wq) 1325df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 1335df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return ioread32(&wq->ctrl->error_status); 1345df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 1355df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1365df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarvoid vnic_wq_enable(struct vnic_wq *wq) 1375df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 1385df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(1, &wq->ctrl->enable); 1395df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 1405df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1415df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarint vnic_wq_disable(struct vnic_wq *wq) 1425df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 1435df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar unsigned int wait; 1445df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1455df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->enable); 1465df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1475df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar /* Wait for HW to ACK disable request */ 1485df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar for (wait = 0; wait < 100; wait++) { 1495df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar if (!(ioread32(&wq->ctrl->running))) 1505df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return 0; 1515df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar udelay(1); 1525df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 1535df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1545df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index); 1555df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1565df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar return -ETIMEDOUT; 1575df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 1585df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1595df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekarvoid vnic_wq_clean(struct vnic_wq *wq, 1605df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 1615df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar{ 1625df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar struct vnic_wq_buf *buf; 1635df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1645df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar BUG_ON(ioread32(&wq->ctrl->enable)); 1655df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1665df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf = wq->to_clean; 1675df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1685df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar while (vnic_wq_desc_used(wq) > 0) { 1695df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1705df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar (*buf_clean)(wq, buf); 1715df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1725df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar buf = wq->to_clean = buf->next; 1735df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->ring.desc_avail++; 1745df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar } 1755df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1765df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar wq->to_use = wq->to_clean = wq->bufs[0]; 1775df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1785df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->fetch_index); 1795df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->posted_index); 1805df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar iowrite32(0, &wq->ctrl->error_status); 1815df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar 1825df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar vnic_dev_clear_desc_ring(&wq->ring); 1835df6d737dd4b0fe9eccf943abb3677cfea05a6c4Abhijeet Joglekar} 184