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linux/drivers/net/enic/enic_res.c
Vasanthy Kolluri 717258ba4b enic: Add support for multiple hardware receive queues 
Add support for multiple hardware receive queues. The ingress traffic is hashed into one of the receive queues based on IP or TCP or both headers. The max no. of receive queues supported is 8.

Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David Wang <dwang2@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-21 01:26:47 -07:00

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/*
* Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include "wq_enet_desc.h"
#include "rq_enet_desc.h"
#include "cq_enet_desc.h"
#include "vnic_resource.h"
#include "vnic_enet.h"
#include "vnic_dev.h"
#include "vnic_wq.h"
#include "vnic_rq.h"
#include "vnic_cq.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "vnic_nic.h"
#include "vnic_rss.h"
#include "enic_res.h"
#include "enic.h"
int enic_get_vnic_config(struct enic *enic)
{
struct vnic_enet_config *c = &enic->config;
int err;
err = vnic_dev_mac_addr(enic->vdev, enic->mac_addr);
if (err) {
dev_err(enic_get_dev(enic),
"Error getting MAC addr, %d\n", err);
return err;
}
#define GET_CONFIG(m) \
do { \
err = vnic_dev_spec(enic->vdev, \
offsetof(struct vnic_enet_config, m), \
sizeof(c->m), &c->m); \
if (err) { \
dev_err(enic_get_dev(enic), \
"Error getting %s, %d\n", #m, err); \
return err; \
} \
} while (0)
GET_CONFIG(flags);
GET_CONFIG(wq_desc_count);
GET_CONFIG(rq_desc_count);
GET_CONFIG(mtu);
GET_CONFIG(intr_timer_type);
GET_CONFIG(intr_mode);
GET_CONFIG(intr_timer_usec);
GET_CONFIG(loop_tag);
c->wq_desc_count =
min_t(u32, ENIC_MAX_WQ_DESCS,
max_t(u32, ENIC_MIN_WQ_DESCS,
c->wq_desc_count));
c->wq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */
c->rq_desc_count =
min_t(u32, ENIC_MAX_RQ_DESCS,
max_t(u32, ENIC_MIN_RQ_DESCS,
c->rq_desc_count));
c->rq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */
if (c->mtu == 0)
c->mtu = 1500;
c->mtu = min_t(u16, ENIC_MAX_MTU,
max_t(u16, ENIC_MIN_MTU,
c->mtu));
c->intr_timer_usec = min_t(u32,
INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
c->intr_timer_usec);
dev_info(enic_get_dev(enic),
"vNIC MAC addr %pM wq/rq %d/%d mtu %d\n",
enic->mac_addr, c->wq_desc_count, c->rq_desc_count, c->mtu);
dev_info(enic_get_dev(enic), "vNIC csum tx/rx %d/%d "
"tso/lro %d/%d intr timer %d usec rss %d\n",
ENIC_SETTING(enic, TXCSUM), ENIC_SETTING(enic, RXCSUM),
ENIC_SETTING(enic, TSO), ENIC_SETTING(enic, LRO),
c->intr_timer_usec, ENIC_SETTING(enic, RSS));
return 0;
}
int enic_add_vlan(struct enic *enic, u16 vlanid)
{
u64 a0 = vlanid, a1 = 0;
int wait = 1000;
int err;
err = vnic_dev_cmd(enic->vdev, CMD_VLAN_ADD, &a0, &a1, wait);
if (err)
dev_err(enic_get_dev(enic), "Can't add vlan id, %d\n", err);
return err;
}
int enic_del_vlan(struct enic *enic, u16 vlanid)
{
u64 a0 = vlanid, a1 = 0;
int wait = 1000;
int err;
err = vnic_dev_cmd(enic->vdev, CMD_VLAN_DEL, &a0, &a1, wait);
if (err)
dev_err(enic_get_dev(enic), "Can't delete vlan id, %d\n", err);
return err;
}
int enic_set_nic_cfg(struct enic *enic, u8 rss_default_cpu, u8 rss_hash_type,
u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable, u8 tso_ipid_split_en,
u8 ig_vlan_strip_en)
{
u64 a0, a1;
u32 nic_cfg;
int wait = 1000;
vnic_set_nic_cfg(&nic_cfg, rss_default_cpu,
rss_hash_type, rss_hash_bits, rss_base_cpu,
rss_enable, tso_ipid_split_en, ig_vlan_strip_en);
a0 = nic_cfg;
a1 = 0;
return vnic_dev_cmd(enic->vdev, CMD_NIC_CFG, &a0, &a1, wait);
}
int enic_set_rss_key(struct enic *enic, dma_addr_t key_pa, u64 len)
{
u64 a0 = (u64)key_pa, a1 = len;
int wait = 1000;
return vnic_dev_cmd(enic->vdev, CMD_RSS_KEY, &a0, &a1, wait);
}
int enic_set_rss_cpu(struct enic *enic, dma_addr_t cpu_pa, u64 len)
{
u64 a0 = (u64)cpu_pa, a1 = len;
int wait = 1000;
return vnic_dev_cmd(enic->vdev, CMD_RSS_CPU, &a0, &a1, wait);
}
void enic_free_vnic_resources(struct enic *enic)
{
unsigned int i;
for (i = 0; i < enic->wq_count; i++)
vnic_wq_free(&enic->wq[i]);
for (i = 0; i < enic->rq_count; i++)
vnic_rq_free(&enic->rq[i]);
for (i = 0; i < enic->cq_count; i++)
vnic_cq_free(&enic->cq[i]);
for (i = 0; i < enic->intr_count; i++)
vnic_intr_free(&enic->intr[i]);
}
void enic_get_res_counts(struct enic *enic)
{
enic->wq_count = vnic_dev_get_res_count(enic->vdev, RES_TYPE_WQ);
enic->rq_count = vnic_dev_get_res_count(enic->vdev, RES_TYPE_RQ);
enic->cq_count = vnic_dev_get_res_count(enic->vdev, RES_TYPE_CQ);
enic->intr_count = vnic_dev_get_res_count(enic->vdev,
RES_TYPE_INTR_CTRL);
dev_info(enic_get_dev(enic),
"vNIC resources avail: wq %d rq %d cq %d intr %d\n",
enic->wq_count, enic->rq_count,
enic->cq_count, enic->intr_count);
}
void enic_init_vnic_resources(struct enic *enic)
{
enum vnic_dev_intr_mode intr_mode;
unsigned int mask_on_assertion;
unsigned int interrupt_offset;
unsigned int error_interrupt_enable;
unsigned int error_interrupt_offset;
unsigned int cq_index;
unsigned int i;
intr_mode = vnic_dev_get_intr_mode(enic->vdev);
/* Init RQ/WQ resources.
*
* RQ[0 - n-1] point to CQ[0 - n-1]
* WQ[0 - m-1] point to CQ[n - n+m-1]
*
* Error interrupt is not enabled for MSI.
*/
switch (intr_mode) {
case VNIC_DEV_INTR_MODE_INTX:
case VNIC_DEV_INTR_MODE_MSIX:
error_interrupt_enable = 1;
error_interrupt_offset = enic->intr_count - 2;
break;
default:
error_interrupt_enable = 0;
error_interrupt_offset = 0;
break;
}
for (i = 0; i < enic->rq_count; i++) {
cq_index = i;
vnic_rq_init(&enic->rq[i],
cq_index,
error_interrupt_enable,
error_interrupt_offset);
}
for (i = 0; i < enic->wq_count; i++) {
cq_index = enic->rq_count + i;
vnic_wq_init(&enic->wq[i],
cq_index,
error_interrupt_enable,
error_interrupt_offset);
}
/* Init CQ resources
*
* CQ[0 - n+m-1] point to INTR[0] for INTx, MSI
* CQ[0 - n+m-1] point to INTR[0 - n+m-1] for MSI-X
*/
for (i = 0; i < enic->cq_count; i++) {
switch (intr_mode) {
case VNIC_DEV_INTR_MODE_MSIX:
interrupt_offset = i;
break;
default:
interrupt_offset = 0;
break;
}
vnic_cq_init(&enic->cq[i],
0 /* flow_control_enable */,
1 /* color_enable */,
0 /* cq_head */,
0 /* cq_tail */,
1 /* cq_tail_color */,
1 /* interrupt_enable */,
1 /* cq_entry_enable */,
0 /* cq_message_enable */,
interrupt_offset,
0 /* cq_message_addr */);
}
/* Init INTR resources
*
* mask_on_assertion is not used for INTx due to the level-
* triggered nature of INTx
*/
switch (intr_mode) {
case VNIC_DEV_INTR_MODE_MSI:
case VNIC_DEV_INTR_MODE_MSIX:
mask_on_assertion = 1;
break;
default:
mask_on_assertion = 0;
break;
}
for (i = 0; i < enic->intr_count; i++) {
vnic_intr_init(&enic->intr[i],
INTR_COALESCE_USEC_TO_HW(enic->config.intr_timer_usec),
enic->config.intr_timer_type,
mask_on_assertion);
}
}
int enic_alloc_vnic_resources(struct enic *enic)
{
enum vnic_dev_intr_mode intr_mode;
unsigned int i;
int err;
intr_mode = vnic_dev_get_intr_mode(enic->vdev);
dev_info(enic_get_dev(enic), "vNIC resources used: "
"wq %d rq %d cq %d intr %d intr mode %s\n",
enic->wq_count, enic->rq_count,
enic->cq_count, enic->intr_count,
intr_mode == VNIC_DEV_INTR_MODE_INTX ? "legacy PCI INTx" :
intr_mode == VNIC_DEV_INTR_MODE_MSI ? "MSI" :
intr_mode == VNIC_DEV_INTR_MODE_MSIX ? "MSI-X" :
"unknown");
/* Allocate queue resources
*/
for (i = 0; i < enic->wq_count; i++) {
err = vnic_wq_alloc(enic->vdev, &enic->wq[i], i,
enic->config.wq_desc_count,
sizeof(struct wq_enet_desc));
if (err)
goto err_out_cleanup;
}
for (i = 0; i < enic->rq_count; i++) {
err = vnic_rq_alloc(enic->vdev, &enic->rq[i], i,
enic->config.rq_desc_count,
sizeof(struct rq_enet_desc));
if (err)
goto err_out_cleanup;
}
for (i = 0; i < enic->cq_count; i++) {
if (i < enic->rq_count)
err = vnic_cq_alloc(enic->vdev, &enic->cq[i], i,
enic->config.rq_desc_count,
sizeof(struct cq_enet_rq_desc));
else
err = vnic_cq_alloc(enic->vdev, &enic->cq[i], i,
enic->config.wq_desc_count,
sizeof(struct cq_enet_wq_desc));
if (err)
goto err_out_cleanup;
}
for (i = 0; i < enic->intr_count; i++) {
err = vnic_intr_alloc(enic->vdev, &enic->intr[i], i);
if (err)
goto err_out_cleanup;
}
/* Hook remaining resource
*/
enic->legacy_pba = vnic_dev_get_res(enic->vdev,
RES_TYPE_INTR_PBA_LEGACY, 0);
if (!enic->legacy_pba && intr_mode == VNIC_DEV_INTR_MODE_INTX) {
dev_err(enic_get_dev(enic),
"Failed to hook legacy pba resource\n");
err = -ENODEV;
goto err_out_cleanup;
}
return 0;
err_out_cleanup:
enic_free_vnic_resources(enic);
return err;
}
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