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netdevsim: Add multi-queue support

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Currently netdevsim only supports a single queue per port, which is
insufficient for testing multi-queue TC schedulers e.g. sch_mq.  Extend
the current sysfs interface so that users can create ports with multiple
queues:

$ echo "[ID] [PORT_COUNT] [NUM_QUEUES]" > /sys/bus/netdevsim/new_device

As an example, echoing "2 4 8" creates 4 ports, with 8 queues per port.
Note, this is compatible with the current interface, with default number
of queues set to 1.  For example, echoing "2 4" creates 4 ports with 1
queue per port; echoing "2" simply creates 1 port with 1 queue.

Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peilin Ye 2021-07-15 18:52:45 -07:00 committed by David S. Miller
parent b83d23a2a3
commit d4861fc6be
3 changed files with 15 additions and 9 deletions
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17
drivers/net/netdevsim/bus.c
View File

@ -262,29 +262,31 @@ static struct device_type nsim_bus_dev_type = {
};
static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count);
nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
static ssize_t
new_device_store(struct bus_type *bus, const char *buf, size_t count)
{
unsigned int id, port_count, num_queues;
struct nsim_bus_dev *nsim_bus_dev;
unsigned int port_count;
unsigned int id;
int err;
err = sscanf(buf, "%u %u", &id, &port_count);
err = sscanf(buf, "%u %u %u", &id, &port_count, &num_queues);
switch (err) {
case 1:
port_count = 1;
fallthrough;
case 2:
num_queues = 1;
fallthrough;
case 3:
if (id > INT_MAX) {
pr_err("Value of \"id\" is too big.\n");
return -EINVAL;
}
break;
default:
pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
pr_err("Format for adding new device is \"id port_count num_queues\" (uint uint unit).\n");
return -EINVAL;
}
@ -295,7 +297,7 @@ new_device_store(struct bus_type *bus, const char *buf, size_t count)
goto err;
}
nsim_bus_dev = nsim_bus_dev_new(id, port_count);
nsim_bus_dev = nsim_bus_dev_new(id, port_count, num_queues);
if (IS_ERR(nsim_bus_dev)) {
err = PTR_ERR(nsim_bus_dev);
goto err;
@ -397,7 +399,7 @@ static struct bus_type nsim_bus = {
#define NSIM_BUS_DEV_MAX_VFS 4
static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count)
nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues)
{
struct nsim_bus_dev *nsim_bus_dev;
int err;
@ -413,6 +415,7 @@ nsim_bus_dev_new(unsigned int id, unsigned int port_count)
nsim_bus_dev->dev.bus = &nsim_bus;
nsim_bus_dev->dev.type = &nsim_bus_dev_type;
nsim_bus_dev->port_count = port_count;
nsim_bus_dev->num_queues = num_queues;
nsim_bus_dev->initial_net = current->nsproxy->net_ns;
nsim_bus_dev->max_vfs = NSIM_BUS_DEV_MAX_VFS;
mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);

6
drivers/net/netdevsim/netdev.c
View File

@ -347,7 +347,8 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
struct netdevsim *ns;
int err;
dev = alloc_netdev(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup);
dev = alloc_netdev_mq(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup,
nsim_dev->nsim_bus_dev->num_queues);
if (!dev)
return ERR_PTR(-ENOMEM);
@ -392,7 +393,8 @@ void nsim_destroy(struct netdevsim *ns)
static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
NL_SET_ERR_MSG_MOD(extack, "Please use: echo \"[ID] [PORT_COUNT]\" > /sys/bus/netdevsim/new_device");
NL_SET_ERR_MSG_MOD(extack,
"Please use: echo \"[ID] [PORT_COUNT] [NUM_QUEUES]\" > /sys/bus/netdevsim/new_device");
return -EOPNOTSUPP;
}

1
drivers/net/netdevsim/netdevsim.h
View File

@ -352,6 +352,7 @@ struct nsim_bus_dev {
struct device dev;
struct list_head list;
unsigned int port_count;
unsigned int num_queues; /* Number of queues for each port on this bus */
struct net *initial_net; /* Purpose of this is to carry net pointer
* during the probe time only.
*/