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netdevsim: Add dummy psample implementation

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Allow netdevsim to report "sampled" packets to the psample module by
periodically generating packets from a work queue. The behavior can be
enabled / disabled (default) and the various meta data attributes can be
controlled via debugfs knobs.

This implementation enables both testing of the psample module with all
the optional attributes as well as development of user space
applications on top of psample such as hsflowd and a Wireshark dissector
for psample generic netlink packets.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel
2021-03-14 14:19:32 +02:00
committed by David S. Miller
parent 07e1a5809b
commit a8700c3dd0
5 changed files with 299 additions and 2 deletions
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17
drivers/net/netdevsim/dev.c
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@@ -1032,10 +1032,14 @@ static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
if (err)
goto err_fib_destroy;
err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
err = nsim_dev_psample_init(nsim_dev);
if (err)
goto err_health_exit;
err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
if (err)
goto err_psample_exit;
nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
0200,
nsim_dev->ddir,
@@ -1043,6 +1047,8 @@ static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
&nsim_dev_take_snapshot_fops);
return 0;
err_psample_exit:
nsim_dev_psample_exit(nsim_dev);
err_health_exit:
nsim_dev_health_exit(nsim_dev);
err_fib_destroy:
@@ -1118,14 +1124,20 @@ int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
if (err)
goto err_health_exit;
err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
err = nsim_dev_psample_init(nsim_dev);
if (err)
goto err_bpf_dev_exit;
err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
if (err)
goto err_psample_exit;
devlink_params_publish(devlink);
devlink_reload_enable(devlink);
return 0;
err_psample_exit:
nsim_dev_psample_exit(nsim_dev);
err_bpf_dev_exit:
nsim_bpf_dev_exit(nsim_dev);
err_health_exit:
@@ -1158,6 +1170,7 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
return;
debugfs_remove(nsim_dev->take_snapshot);
nsim_dev_port_del_all(nsim_dev);
nsim_dev_psample_exit(nsim_dev);
nsim_dev_health_exit(nsim_dev);
nsim_fib_destroy(devlink, nsim_dev->fib_data);
nsim_dev_traps_exit(devlink);