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Merge branch 'enic-next'

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Govindarajulu Varadarajan says:

====================
enic: Add adaptive coalescing interrupt support

This series add support for adaptive coalescing interrupt and updates
enic Maintainers.

v1->v2:
	* Add commit log
	* do vnic_intr_coalescing_timer_set only while enabling intr
	* use ktime_get instead of hrtimer
	* make enic_set_rx_coal_setting return type void
	* change func name enic_apply_int_moderation to enic_calc_int_moderation
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-05-21 17:04:42 -04:00
commit 21ea04fa2d
5 changed files with 245 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
MAINTAINERS
View File

@ -2228,9 +2228,8 @@ F: drivers/platform/chrome/
CISCO VIC ETHERNET NIC DRIVER
M: Christian Benvenuti <benve@cisco.com>
M: Sujith Sankar <ssujith@cisco.com>
M: Govindarajulu Varadarajan <govindarajulu90@gmail.com>
M: Govindarajulu Varadarajan <_govind@gmx.com>
M: Neel Patel <neepatel@cisco.com>
M: Nishank Trivedi <nistrive@cisco.com>
S: Supported
F: drivers/net/ethernet/cisco/enic/

30
drivers/net/ethernet/cisco/enic/enic.h
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@ -43,6 +43,8 @@
#define ENIC_CQ_MAX (ENIC_WQ_MAX + ENIC_RQ_MAX)
#define ENIC_INTR_MAX (ENIC_CQ_MAX + 2)
#define ENIC_AIC_LARGE_PKT_DIFF 3
struct enic_msix_entry {
int requested;
char devname[IFNAMSIZ];
@ -50,6 +52,33 @@ struct enic_msix_entry {
void *devid;
};
/* Store only the lower range. Higher range is given by fw. */
struct enic_intr_mod_range {
u32 small_pkt_range_start;
u32 large_pkt_range_start;
};
struct enic_intr_mod_table {
u32 rx_rate;
u32 range_percent;
};
#define ENIC_MAX_LINK_SPEEDS 3
#define ENIC_LINK_SPEED_10G 10000
#define ENIC_LINK_SPEED_4G 4000
#define ENIC_LINK_40G_INDEX 2
#define ENIC_LINK_10G_INDEX 1
#define ENIC_LINK_4G_INDEX 0
#define ENIC_RX_COALESCE_RANGE_END 125
#define ENIC_AIC_TS_BREAK 100
struct enic_rx_coal {
u32 small_pkt_range_start;
u32 large_pkt_range_start;
u32 range_end;
u32 use_adaptive_rx_coalesce;
};
/* priv_flags */
#define ENIC_SRIOV_ENABLED (1 << 0)
@ -92,6 +121,7 @@ struct enic {
unsigned int mc_count;
unsigned int uc_count;
u32 port_mtu;
struct enic_rx_coal rx_coalesce_setting;
u32 rx_coalesce_usecs;
u32 tx_coalesce_usecs;
#ifdef CONFIG_PCI_IOV

61
drivers/net/ethernet/cisco/enic/enic_ethtool.c
View File

@ -79,6 +79,17 @@ static const struct enic_stat enic_rx_stats[] = {
static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
void enic_intr_coal_set_rx(struct enic *enic, u32 timer)
{
int i;
int intr;
for (i = 0; i < enic->rq_count; i++) {
intr = enic_msix_rq_intr(enic, i);
vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
}
}
static int enic_get_settings(struct net_device *netdev,
struct ethtool_cmd *ecmd)
{
@ -178,9 +189,14 @@ static int enic_get_coalesce(struct net_device *netdev,
struct ethtool_coalesce *ecmd)
{
struct enic *enic = netdev_priv(netdev);
struct enic_rx_coal *rxcoal = &enic->rx_coalesce_setting;
ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;
if (rxcoal->use_adaptive_rx_coalesce)
ecmd->use_adaptive_rx_coalesce = 1;
ecmd->rx_coalesce_usecs_low = rxcoal->small_pkt_range_start;
ecmd->rx_coalesce_usecs_high = rxcoal->range_end;
return 0;
}
@ -191,17 +207,31 @@ static int enic_set_coalesce(struct net_device *netdev,
struct enic *enic = netdev_priv(netdev);
u32 tx_coalesce_usecs;
u32 rx_coalesce_usecs;
u32 rx_coalesce_usecs_low;
u32 rx_coalesce_usecs_high;
u32 coalesce_usecs_max;
unsigned int i, intr;
struct enic_rx_coal *rxcoal = &enic->rx_coalesce_setting;
coalesce_usecs_max = vnic_dev_get_intr_coal_timer_max(enic->vdev);
tx_coalesce_usecs = min_t(u32, ecmd->tx_coalesce_usecs,
vnic_dev_get_intr_coal_timer_max(enic->vdev));
coalesce_usecs_max);
rx_coalesce_usecs = min_t(u32, ecmd->rx_coalesce_usecs,
vnic_dev_get_intr_coal_timer_max(enic->vdev));
coalesce_usecs_max);
rx_coalesce_usecs_low = min_t(u32, ecmd->rx_coalesce_usecs_low,
coalesce_usecs_max);
rx_coalesce_usecs_high = min_t(u32, ecmd->rx_coalesce_usecs_high,
coalesce_usecs_max);
switch (vnic_dev_get_intr_mode(enic->vdev)) {
case VNIC_DEV_INTR_MODE_INTX:
if (tx_coalesce_usecs != rx_coalesce_usecs)
return -EINVAL;
if (ecmd->use_adaptive_rx_coalesce ||
ecmd->rx_coalesce_usecs_low ||
ecmd->rx_coalesce_usecs_high)
return -EOPNOTSUPP;
intr = enic_legacy_io_intr();
vnic_intr_coalescing_timer_set(&enic->intr[intr],
@ -210,6 +240,10 @@ static int enic_set_coalesce(struct net_device *netdev,
case VNIC_DEV_INTR_MODE_MSI:
if (tx_coalesce_usecs != rx_coalesce_usecs)
return -EINVAL;
if (ecmd->use_adaptive_rx_coalesce ||
ecmd->rx_coalesce_usecs_low ||
ecmd->rx_coalesce_usecs_high)
return -EOPNOTSUPP;
vnic_intr_coalescing_timer_set(&enic->intr[0],
tx_coalesce_usecs);
@ -221,12 +255,27 @@ static int enic_set_coalesce(struct net_device *netdev,
tx_coalesce_usecs);
}
for (i = 0; i < enic->rq_count; i++) {
intr = enic_msix_rq_intr(enic, i);
vnic_intr_coalescing_timer_set(&enic->intr[intr],
rx_coalesce_usecs);
if (rxcoal->use_adaptive_rx_coalesce) {
if (!ecmd->use_adaptive_rx_coalesce) {
rxcoal->use_adaptive_rx_coalesce = 0;
enic_intr_coal_set_rx(enic, rx_coalesce_usecs);
}
} else {
if (ecmd->use_adaptive_rx_coalesce)
rxcoal->use_adaptive_rx_coalesce = 1;
else
enic_intr_coal_set_rx(enic, rx_coalesce_usecs);
}
if (ecmd->rx_coalesce_usecs_high) {
if (rx_coalesce_usecs_high <
(rx_coalesce_usecs_low + ENIC_AIC_LARGE_PKT_DIFF))
return -EINVAL;
rxcoal->range_end = rx_coalesce_usecs_high;
rxcoal->small_pkt_range_start = rx_coalesce_usecs_low;
rxcoal->large_pkt_range_start = rx_coalesce_usecs_low +
ENIC_AIC_LARGE_PKT_DIFF;
}
break;
default:
break;

150
drivers/net/ethernet/cisco/enic/enic_main.c
View File

@ -38,6 +38,7 @@
#include <linux/rtnetlink.h>
#include <linux/prefetch.h>
#include <net/ip6_checksum.h>
#include <linux/ktime.h>
#include "cq_enet_desc.h"
#include "vnic_dev.h"
@ -72,6 +73,35 @@ MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, enic_id_table);
#define ENIC_LARGE_PKT_THRESHOLD 1000
#define ENIC_MAX_COALESCE_TIMERS 10
/* Interrupt moderation table, which will be used to decide the
* coalescing timer values
* {rx_rate in Mbps, mapping percentage of the range}
*/
struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
{4000, 0},
{4400, 10},
{5060, 20},
{5230, 30},
{5540, 40},
{5820, 50},
{6120, 60},
{6435, 70},
{6745, 80},
{7000, 90},
{0xFFFFFFFF, 100}
};
/* This table helps the driver to pick different ranges for rx coalescing
* timer depending on the link speed.
*/
struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
{0, 0}, /* 0 - 4 Gbps */
{0, 3}, /* 4 - 10 Gbps */
{3, 6}, /* 10 - 40 Gbps */
};
int enic_is_dynamic(struct enic *enic)
{
return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
@ -979,6 +1009,15 @@ static int enic_rq_alloc_buf(struct vnic_rq *rq)
return 0;
}
static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
u32 pkt_len)
{
if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
pkt_size->large_pkt_bytes_cnt += pkt_len;
else
pkt_size->small_pkt_bytes_cnt += pkt_len;
}
static void enic_rq_indicate_buf(struct vnic_rq *rq,
struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
int skipped, void *opaque)
@ -986,6 +1025,7 @@ static void enic_rq_indicate_buf(struct vnic_rq *rq,
struct enic *enic = vnic_dev_priv(rq->vdev);
struct net_device *netdev = enic->netdev;
struct sk_buff *skb;
struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
u8 type, color, eop, sop, ingress_port, vlan_stripped;
u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
@ -1056,6 +1096,9 @@ static void enic_rq_indicate_buf(struct vnic_rq *rq,
napi_gro_receive(&enic->napi[q_number], skb);
else
netif_receive_skb(skb);
if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
enic_intr_update_pkt_size(&cq->pkt_size_counter,
bytes_written);
} else {
/* Buffer overflow
@ -1134,6 +1177,64 @@ static int enic_poll(struct napi_struct *napi, int budget)
return rq_work_done;
}
static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
{
unsigned int intr = enic_msix_rq_intr(enic, rq->index);
struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
u32 timer = cq->tobe_rx_coal_timeval;
if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
}
}
static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
{
struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
int index;
u32 timer;
u32 range_start;
u32 traffic;
u64 delta;
ktime_t now = ktime_get();
delta = ktime_us_delta(now, cq->prev_ts);
if (delta < ENIC_AIC_TS_BREAK)
return;
cq->prev_ts = now;
traffic = pkt_size_counter->large_pkt_bytes_cnt +
pkt_size_counter->small_pkt_bytes_cnt;
/* The table takes Mbps
* traffic *= 8 => bits
* traffic *= (10^6 / delta) => bps
* traffic /= 10^6 => Mbps
*
* Combining, traffic *= (8 / delta)
*/
traffic <<= 3;
traffic /= delta;
for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
if (traffic < mod_table[index].rx_rate)
break;
range_start = (pkt_size_counter->small_pkt_bytes_cnt >
pkt_size_counter->large_pkt_bytes_cnt << 1) ?
rx_coal->small_pkt_range_start :
rx_coal->large_pkt_range_start;
timer = range_start + ((rx_coal->range_end - range_start) *
mod_table[index].range_percent / 100);
/* Damping */
cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
pkt_size_counter->large_pkt_bytes_cnt = 0;
pkt_size_counter->small_pkt_bytes_cnt = 0;
}
static int enic_poll_msix(struct napi_struct *napi, int budget)
{
struct net_device *netdev = napi->dev;
@ -1171,6 +1272,13 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
if (err)
work_done = work_to_do;
if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
/* Call the function which refreshes
* the intr coalescing timer value based on
* the traffic. This is supported only in
* the case of MSI-x mode
*/
enic_calc_int_moderation(enic, &enic->rq[rq]);
if (work_done < work_to_do) {
@ -1179,6 +1287,8 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
*/
napi_complete(napi);
if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
enic_set_int_moderation(enic, &enic->rq[rq]);
vnic_intr_unmask(&enic->intr[intr]);
}
@ -1314,6 +1424,42 @@ static void enic_synchronize_irqs(struct enic *enic)
}
}
static void enic_set_rx_coal_setting(struct enic *enic)
{
unsigned int speed;
int index = -1;
struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
/* If intr mode is not MSIX, do not do adaptive coalescing */
if (VNIC_DEV_INTR_MODE_MSIX != vnic_dev_get_intr_mode(enic->vdev)) {
netdev_info(enic->netdev, "INTR mode is not MSIX, Not initializing adaptive coalescing");
return;
}
/* 1. Read the link speed from fw
* 2. Pick the default range for the speed
* 3. Update it in enic->rx_coalesce_setting
*/
speed = vnic_dev_port_speed(enic->vdev);
if (ENIC_LINK_SPEED_10G < speed)
index = ENIC_LINK_40G_INDEX;
else if (ENIC_LINK_SPEED_4G < speed)
index = ENIC_LINK_10G_INDEX;
else
index = ENIC_LINK_4G_INDEX;
rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
/* Start with the value provided by UCSM */
for (index = 0; index < enic->rq_count; index++)
enic->cq[index].cur_rx_coal_timeval =
enic->config.intr_timer_usec;
rx_coal->use_adaptive_rx_coalesce = 1;
}
static int enic_dev_notify_set(struct enic *enic)
{
int err;
@ -2231,6 +2377,7 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
enic->notify_timer.function = enic_notify_timer;
enic->notify_timer.data = (unsigned long)enic;
enic_set_rx_coal_setting(enic);
INIT_WORK(&enic->reset, enic_reset);
INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
@ -2250,6 +2397,9 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
}
enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
/* rx coalesce time already got initialized. This gets used
* if adaptive coal is turned off
*/
enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))

9
drivers/net/ethernet/cisco/enic/vnic_cq.h
View File

@ -50,6 +50,11 @@ struct vnic_cq_ctrl {
u32 pad10;
};
struct vnic_rx_bytes_counter {
unsigned int small_pkt_bytes_cnt;
unsigned int large_pkt_bytes_cnt;
};
struct vnic_cq {
unsigned int index;
struct vnic_dev *vdev;
@ -58,6 +63,10 @@ struct vnic_cq {
unsigned int to_clean;
unsigned int last_color;
unsigned int interrupt_offset;
struct vnic_rx_bytes_counter pkt_size_counter;
unsigned int cur_rx_coal_timeval;
unsigned int tobe_rx_coal_timeval;
ktime_t prev_ts;
};
static inline unsigned int vnic_cq_service(struct vnic_cq *cq,