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cxgb4: add support for tx max rate limiting 

Implement set_tx_maxrate NDO to perform per queue tx rate limiting.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rahul Lakkireddy 2016-08-22 16:29:08 +05:30 committed by David S. Miller
parent 6cede1f17f
commit 10a2604ea2
3 changed files with 105 additions and 0 deletions
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20
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -881,6 +881,26 @@ struct ch_sched_params {
} u;
};
enum {
SCHED_CLASS_TYPE_PACKET = 0, /* class type */
};
enum {
SCHED_CLASS_LEVEL_CL_RL = 0, /* class rate limiter */
};
enum {
SCHED_CLASS_MODE_CLASS = 0, /* per-class scheduling */
};
enum {
SCHED_CLASS_RATEUNIT_BITS = 0, /* bit rate scheduling */
};
enum {
SCHED_CLASS_RATEMODE_ABS = 1, /* Kb/s */
};
/* Support for "sched_queue" command to allow one or more NIC TX Queues
* to be bound to a TX Scheduling Class.
*/

82
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -3140,6 +3140,87 @@ static void cxgb_netpoll(struct net_device *dev)
}
#endif
static int cxgb_set_tx_maxrate(struct net_device *dev, int index, u32 rate)
{
struct port_info *pi = netdev_priv(dev);
struct adapter *adap = pi->adapter;
struct sched_class *e;
struct ch_sched_params p;
struct ch_sched_queue qe;
u32 req_rate;
int err = 0;
if (!can_sched(dev))
return -ENOTSUPP;
if (index < 0 || index > pi->nqsets - 1)
return -EINVAL;
if (!(adap->flags & FULL_INIT_DONE)) {
dev_err(adap->pdev_dev,
"Failed to rate limit on queue %d. Link Down?\n",
index);
return -EINVAL;
}
/* Convert from Mbps to Kbps */
req_rate = rate << 10;
/* Max rate is 10 Gbps */
if (req_rate >= SCHED_MAX_RATE_KBPS) {
dev_err(adap->pdev_dev,
"Invalid rate %u Mbps, Max rate is %u Gbps\n",
rate, SCHED_MAX_RATE_KBPS);
return -ERANGE;
}
/* First unbind the queue from any existing class */
memset(&qe, 0, sizeof(qe));
qe.queue = index;
qe.class = SCHED_CLS_NONE;
err = cxgb4_sched_class_unbind(dev, (void *)(&qe), SCHED_QUEUE);
if (err) {
dev_err(adap->pdev_dev,
"Unbinding Queue %d on port %d fail. Err: %d\n",
index, pi->port_id, err);
return err;
}
/* Queue already unbound */
if (!req_rate)
return 0;
/* Fetch any available unused or matching scheduling class */
memset(&p, 0, sizeof(p));
p.type = SCHED_CLASS_TYPE_PACKET;
p.u.params.level = SCHED_CLASS_LEVEL_CL_RL;
p.u.params.mode = SCHED_CLASS_MODE_CLASS;
p.u.params.rateunit = SCHED_CLASS_RATEUNIT_BITS;
p.u.params.ratemode = SCHED_CLASS_RATEMODE_ABS;
p.u.params.channel = pi->tx_chan;
p.u.params.class = SCHED_CLS_NONE;
p.u.params.minrate = 0;
p.u.params.maxrate = req_rate;
p.u.params.weight = 0;
p.u.params.pktsize = dev->mtu;
e = cxgb4_sched_class_alloc(dev, &p);
if (!e)
return -ENOMEM;
/* Bind the queue to a scheduling class */
memset(&qe, 0, sizeof(qe));
qe.queue = index;
qe.class = e->idx;
err = cxgb4_sched_class_bind(dev, (void *)(&qe), SCHED_QUEUE);
if (err)
dev_err(adap->pdev_dev,
"Queue rate limiting failed. Err: %d\n", err);
return err;
}
static const struct net_device_ops cxgb4_netdev_ops = {
.ndo_open = cxgb_open,
.ndo_stop = cxgb_close,
@ -3162,6 +3243,7 @@ static const struct net_device_ops cxgb4_netdev_ops = {
#ifdef CONFIG_NET_RX_BUSY_POLL
.ndo_busy_poll = cxgb_busy_poll,
#endif
.ndo_set_tx_maxrate = cxgb_set_tx_maxrate,
};
static const struct net_device_ops cxgb4_mgmt_netdev_ops = {

3
drivers/net/ethernet/chelsio/cxgb4/sched.h
View File

@ -42,6 +42,9 @@
#define FW_SCHED_CLS_NONE 0xffffffff
/* Max rate that can be set to a scheduling class is 10 Gbps */
#define SCHED_MAX_RATE_KBPS 10000000U
enum {
SCHED_STATE_ACTIVE,
SCHED_STATE_UNUSED,