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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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1
drivers/net/netdevsim/netdevsim.h
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@@ -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.
*/