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drop_monitor: Add support for summary alert mode for hardware drops

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In summary alert mode a notification is sent with a list of recent drop
reasons and a count of how many packets were dropped due to this reason.

To avoid expensive operations in the context in which packets are
dropped, each CPU holds an array whose number of entries is the maximum
number of drop reasons that can be encoded in the netlink notification.
Each entry stores the drop reason and a count. When a packet is dropped
the array is traversed and a new entry is created or the count of an
existing entry is incremented.

Later, in process context, the array is replaced with a newly allocated
copy and the old array is encoded in a netlink notification. To avoid
breaking user space, the notification includes the ancillary header,
which is 'struct net_dm_alert_msg' with number of entries set to '0'.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel
2019-08-17 16:28:15 +03:00
committed by David S. Miller
parent 5e58109b1e
commit d40e1deb93
2 changed files with 196 additions and 2 deletions
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3
include/uapi/linux/net_dropmon.h
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@@ -87,6 +87,9 @@ enum net_dm_attr {
NET_DM_ATTR_ORIGIN, /* u16 */
NET_DM_ATTR_HW_TRAP_GROUP_NAME, /* string */
NET_DM_ATTR_HW_TRAP_NAME, /* string */
NET_DM_ATTR_HW_ENTRIES, /* nested */
NET_DM_ATTR_HW_ENTRY, /* nested */
NET_DM_ATTR_HW_TRAP_COUNT, /* u32 */
__NET_DM_ATTR_MAX,
NET_DM_ATTR_MAX = __NET_DM_ATTR_MAX - 1