468 lines
11 KiB
C
468 lines
11 KiB
C
/*
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* Copyright (c) 2013, Cisco 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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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include "usnic_ib.h"
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#include "vnic_resource.h"
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#include "usnic_log.h"
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#include "usnic_vnic.h"
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struct usnic_vnic {
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struct vnic_dev *vdev;
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struct vnic_dev_bar bar[PCI_NUM_RESOURCES];
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struct usnic_vnic_res_chunk chunks[USNIC_VNIC_RES_TYPE_MAX];
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spinlock_t res_lock;
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};
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static enum vnic_res_type _to_vnic_res_type(enum usnic_vnic_res_type res_type)
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{
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#define DEFINE_USNIC_VNIC_RES_AT(usnic_vnic_res_t, vnic_res_type, desc, val) \
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vnic_res_type,
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#define DEFINE_USNIC_VNIC_RES(usnic_vnic_res_t, vnic_res_type, desc) \
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vnic_res_type,
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static enum vnic_res_type usnic_vnic_type_2_vnic_type[] = {
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USNIC_VNIC_RES_TYPES};
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#undef DEFINE_USNIC_VNIC_RES
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#undef DEFINE_USNIC_VNIC_RES_AT
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if (res_type >= USNIC_VNIC_RES_TYPE_MAX)
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return RES_TYPE_MAX;
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return usnic_vnic_type_2_vnic_type[res_type];
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}
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const char *usnic_vnic_res_type_to_str(enum usnic_vnic_res_type res_type)
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{
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#define DEFINE_USNIC_VNIC_RES_AT(usnic_vnic_res_t, vnic_res_type, desc, val) \
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desc,
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#define DEFINE_USNIC_VNIC_RES(usnic_vnic_res_t, vnic_res_type, desc) \
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desc,
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static const char * const usnic_vnic_res_type_desc[] = {
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USNIC_VNIC_RES_TYPES};
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#undef DEFINE_USNIC_VNIC_RES
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#undef DEFINE_USNIC_VNIC_RES_AT
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if (res_type >= USNIC_VNIC_RES_TYPE_MAX)
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return "unknown";
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return usnic_vnic_res_type_desc[res_type];
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}
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const char *usnic_vnic_pci_name(struct usnic_vnic *vnic)
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{
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return pci_name(usnic_vnic_get_pdev(vnic));
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}
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int usnic_vnic_dump(struct usnic_vnic *vnic, char *buf,
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int buf_sz,
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void *hdr_obj,
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int (*printtitle)(void *, char*, int),
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int (*printcols)(char *, int),
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int (*printrow)(void *, char *, int))
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{
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struct usnic_vnic_res_chunk *chunk;
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struct usnic_vnic_res *res;
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struct vnic_dev_bar *bar0;
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int i, j, offset;
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offset = 0;
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bar0 = usnic_vnic_get_bar(vnic, 0);
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offset += scnprintf(buf + offset, buf_sz - offset,
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"VF:%hu BAR0 bus_addr=%pa vaddr=0x%p size=%ld ",
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usnic_vnic_get_index(vnic),
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&bar0->bus_addr,
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bar0->vaddr, bar0->len);
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if (printtitle)
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offset += printtitle(hdr_obj, buf + offset, buf_sz - offset);
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offset += scnprintf(buf + offset, buf_sz - offset, "\n");
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offset += scnprintf(buf + offset, buf_sz - offset,
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"|RES\t|CTRL_PIN\t\t|IN_USE\t");
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if (printcols)
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offset += printcols(buf + offset, buf_sz - offset);
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offset += scnprintf(buf + offset, buf_sz - offset, "\n");
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spin_lock(&vnic->res_lock);
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for (i = 0; i < ARRAY_SIZE(vnic->chunks); i++) {
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chunk = &vnic->chunks[i];
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for (j = 0; j < chunk->cnt; j++) {
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res = chunk->res[j];
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offset += scnprintf(buf + offset, buf_sz - offset,
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"|%s[%u]\t|0x%p\t|%u\t",
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usnic_vnic_res_type_to_str(res->type),
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res->vnic_idx, res->ctrl, !!res->owner);
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if (printrow) {
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offset += printrow(res->owner, buf + offset,
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buf_sz - offset);
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}
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offset += scnprintf(buf + offset, buf_sz - offset,
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"\n");
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}
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}
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spin_unlock(&vnic->res_lock);
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return offset;
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}
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void usnic_vnic_res_spec_update(struct usnic_vnic_res_spec *spec,
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enum usnic_vnic_res_type trgt_type,
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u16 cnt)
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{
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int i;
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for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
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if (spec->resources[i].type == trgt_type) {
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spec->resources[i].cnt = cnt;
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return;
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}
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}
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WARN_ON(1);
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}
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int usnic_vnic_res_spec_satisfied(const struct usnic_vnic_res_spec *min_spec,
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struct usnic_vnic_res_spec *res_spec)
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{
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int found, i, j;
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for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
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found = 0;
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for (j = 0; j < USNIC_VNIC_RES_TYPE_MAX; j++) {
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if (res_spec->resources[i].type !=
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min_spec->resources[i].type)
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continue;
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found = 1;
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if (min_spec->resources[i].cnt >
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res_spec->resources[i].cnt)
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return -EINVAL;
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break;
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}
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if (!found)
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return -EINVAL;
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}
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return 0;
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}
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int usnic_vnic_spec_dump(char *buf, int buf_sz,
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struct usnic_vnic_res_spec *res_spec)
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{
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enum usnic_vnic_res_type res_type;
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int res_cnt;
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int i;
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int offset = 0;
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for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
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res_type = res_spec->resources[i].type;
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res_cnt = res_spec->resources[i].cnt;
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offset += scnprintf(buf + offset, buf_sz - offset,
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"Res: %s Cnt: %d ",
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usnic_vnic_res_type_to_str(res_type),
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res_cnt);
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}
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return offset;
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}
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int usnic_vnic_check_room(struct usnic_vnic *vnic,
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struct usnic_vnic_res_spec *res_spec)
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{
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int i;
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enum usnic_vnic_res_type res_type;
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int res_cnt;
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for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
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res_type = res_spec->resources[i].type;
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res_cnt = res_spec->resources[i].cnt;
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if (res_type == USNIC_VNIC_RES_TYPE_EOL)
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break;
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if (res_cnt > usnic_vnic_res_free_cnt(vnic, res_type))
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return -EBUSY;
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}
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return 0;
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}
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int usnic_vnic_res_cnt(struct usnic_vnic *vnic,
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enum usnic_vnic_res_type type)
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{
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return vnic->chunks[type].cnt;
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}
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int usnic_vnic_res_free_cnt(struct usnic_vnic *vnic,
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enum usnic_vnic_res_type type)
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{
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return vnic->chunks[type].free_cnt;
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}
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struct usnic_vnic_res_chunk *
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usnic_vnic_get_resources(struct usnic_vnic *vnic, enum usnic_vnic_res_type type,
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int cnt, void *owner)
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{
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struct usnic_vnic_res_chunk *src, *ret;
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struct usnic_vnic_res *res;
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int i;
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if (usnic_vnic_res_free_cnt(vnic, type) < cnt || cnt < 1 || !owner)
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return ERR_PTR(-EINVAL);
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ret = kzalloc(sizeof(*ret), GFP_ATOMIC);
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if (!ret) {
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usnic_err("Failed to allocate chunk for %s - Out of memory\n",
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usnic_vnic_pci_name(vnic));
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return ERR_PTR(-ENOMEM);
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}
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ret->res = kzalloc(sizeof(*(ret->res))*cnt, GFP_ATOMIC);
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if (!ret->res) {
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usnic_err("Failed to allocate resources for %s. Out of memory\n",
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usnic_vnic_pci_name(vnic));
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kfree(ret);
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return ERR_PTR(-ENOMEM);
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}
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spin_lock(&vnic->res_lock);
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src = &vnic->chunks[type];
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for (i = 0; i < src->cnt && ret->cnt < cnt; i++) {
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res = src->res[i];
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if (!res->owner) {
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src->free_cnt--;
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res->owner = owner;
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ret->res[ret->cnt++] = res;
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}
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}
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spin_unlock(&vnic->res_lock);
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ret->type = type;
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ret->vnic = vnic;
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WARN_ON(ret->cnt != cnt);
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return ret;
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}
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void usnic_vnic_put_resources(struct usnic_vnic_res_chunk *chunk)
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{
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struct usnic_vnic_res *res;
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int i;
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struct usnic_vnic *vnic = chunk->vnic;
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spin_lock(&vnic->res_lock);
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while ((i = --chunk->cnt) >= 0) {
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res = chunk->res[i];
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chunk->res[i] = NULL;
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res->owner = NULL;
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vnic->chunks[res->type].free_cnt++;
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}
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spin_unlock(&vnic->res_lock);
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kfree(chunk->res);
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kfree(chunk);
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}
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u16 usnic_vnic_get_index(struct usnic_vnic *vnic)
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{
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return usnic_vnic_get_pdev(vnic)->devfn - 1;
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}
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static int usnic_vnic_alloc_res_chunk(struct usnic_vnic *vnic,
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enum usnic_vnic_res_type type,
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struct usnic_vnic_res_chunk *chunk)
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{
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int cnt, err, i;
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struct usnic_vnic_res *res;
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cnt = vnic_dev_get_res_count(vnic->vdev, _to_vnic_res_type(type));
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if (cnt < 1)
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return -EINVAL;
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chunk->cnt = chunk->free_cnt = cnt;
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chunk->res = kzalloc(sizeof(*(chunk->res))*cnt, GFP_KERNEL);
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if (!chunk->res)
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return -ENOMEM;
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for (i = 0; i < cnt; i++) {
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res = kzalloc(sizeof(*res), GFP_KERNEL);
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if (!res) {
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err = -ENOMEM;
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goto fail;
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}
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res->type = type;
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res->vnic_idx = i;
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res->vnic = vnic;
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res->ctrl = vnic_dev_get_res(vnic->vdev,
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_to_vnic_res_type(type), i);
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chunk->res[i] = res;
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}
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chunk->vnic = vnic;
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return 0;
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fail:
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for (i--; i >= 0; i--)
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kfree(chunk->res[i]);
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kfree(chunk->res);
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return err;
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}
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static void usnic_vnic_free_res_chunk(struct usnic_vnic_res_chunk *chunk)
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{
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int i;
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for (i = 0; i < chunk->cnt; i++)
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kfree(chunk->res[i]);
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kfree(chunk->res);
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}
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static int usnic_vnic_discover_resources(struct pci_dev *pdev,
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struct usnic_vnic *vnic)
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{
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enum usnic_vnic_res_type res_type;
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int i;
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int err = 0;
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for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
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if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
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continue;
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vnic->bar[i].len = pci_resource_len(pdev, i);
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vnic->bar[i].vaddr = pci_iomap(pdev, i, vnic->bar[i].len);
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if (!vnic->bar[i].vaddr) {
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usnic_err("Cannot memory-map BAR %d, aborting\n",
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i);
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err = -ENODEV;
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goto out_clean_bar;
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}
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vnic->bar[i].bus_addr = pci_resource_start(pdev, i);
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}
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vnic->vdev = vnic_dev_register(NULL, pdev, pdev, vnic->bar,
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ARRAY_SIZE(vnic->bar));
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if (!vnic->vdev) {
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usnic_err("Failed to register device %s\n",
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pci_name(pdev));
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err = -EINVAL;
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goto out_clean_bar;
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}
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for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
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res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++) {
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err = usnic_vnic_alloc_res_chunk(vnic, res_type,
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&vnic->chunks[res_type]);
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if (err) {
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usnic_err("Failed to alloc res %s with err %d\n",
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usnic_vnic_res_type_to_str(res_type),
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err);
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goto out_clean_chunks;
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}
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}
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return 0;
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out_clean_chunks:
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for (res_type--; res_type > USNIC_VNIC_RES_TYPE_EOL; res_type--)
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usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
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vnic_dev_unregister(vnic->vdev);
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out_clean_bar:
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for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
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if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
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continue;
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if (!vnic->bar[i].vaddr)
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break;
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iounmap(vnic->bar[i].vaddr);
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}
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return err;
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}
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struct pci_dev *usnic_vnic_get_pdev(struct usnic_vnic *vnic)
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{
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return vnic_dev_get_pdev(vnic->vdev);
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}
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struct vnic_dev_bar *usnic_vnic_get_bar(struct usnic_vnic *vnic,
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int bar_num)
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{
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return (bar_num < ARRAY_SIZE(vnic->bar)) ? &vnic->bar[bar_num] : NULL;
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}
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static void usnic_vnic_release_resources(struct usnic_vnic *vnic)
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{
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int i;
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struct pci_dev *pdev;
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enum usnic_vnic_res_type res_type;
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pdev = usnic_vnic_get_pdev(vnic);
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for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
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res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++)
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usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
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vnic_dev_unregister(vnic->vdev);
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for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
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if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
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continue;
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iounmap(vnic->bar[i].vaddr);
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}
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}
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struct usnic_vnic *usnic_vnic_alloc(struct pci_dev *pdev)
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{
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struct usnic_vnic *vnic;
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int err = 0;
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if (!pci_is_enabled(pdev)) {
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usnic_err("PCI dev %s is disabled\n", pci_name(pdev));
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return ERR_PTR(-EINVAL);
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}
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vnic = kzalloc(sizeof(*vnic), GFP_KERNEL);
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if (!vnic) {
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usnic_err("Failed to alloc vnic for %s - out of memory\n",
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pci_name(pdev));
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return ERR_PTR(-ENOMEM);
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}
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spin_lock_init(&vnic->res_lock);
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err = usnic_vnic_discover_resources(pdev, vnic);
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if (err) {
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usnic_err("Failed to discover %s resources with err %d\n",
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pci_name(pdev), err);
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goto out_free_vnic;
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}
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usnic_dbg("Allocated vnic for %s\n", usnic_vnic_pci_name(vnic));
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return vnic;
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out_free_vnic:
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kfree(vnic);
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return ERR_PTR(err);
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}
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void usnic_vnic_free(struct usnic_vnic *vnic)
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{
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usnic_vnic_release_resources(vnic);
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kfree(vnic);
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}
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