netdev: add qstat for csum complete

Recent commit 0cfe71f45f ("netdev: add queue stats") added
a lot of useful stats, but only those immediately needed by virtio.
Presumably virtio does not support CHECKSUM_COMPLETE,
so statistic for that form of checksumming wasn't included.
Other drivers will definitely need it, in fact we expect it
to be needed in net-next soon (mlx5). So let's add the definition
of the counter for CHECKSUM_COMPLETE to uAPI in net already,
so that the counters are in a more natural order (all subsequent
counters have not been present in any released kernel, yet).

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Fixes: 0cfe71f45f ("netdev: add queue stats")
Link: https://lore.kernel.org/r/20240529163547.3693194-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/netlink/specs/netdev.yaml

@@ -349,6 +349,10 @@ attribute-sets:
           Number of packets dropped due to transient lack of resources, such as
           buffer space, host descriptors etc.
         type: uint
+      -
+        name: rx-csum-complete
+        doc: Number of packets that were marked as CHECKSUM_COMPLETE.
+        type: uint
       -
         name: rx-csum-unnecessary
         doc: Number of packets that were marked as CHECKSUM_UNNECESSARY.

include/uapi/linux/netdev.h

@@ -148,6 +148,7 @@ enum {
 	NETDEV_A_QSTATS_RX_ALLOC_FAIL,
 	NETDEV_A_QSTATS_RX_HW_DROPS,
 	NETDEV_A_QSTATS_RX_HW_DROP_OVERRUNS,
+	NETDEV_A_QSTATS_RX_CSUM_COMPLETE,
 	NETDEV_A_QSTATS_RX_CSUM_UNNECESSARY,
 	NETDEV_A_QSTATS_RX_CSUM_NONE,
 	NETDEV_A_QSTATS_RX_CSUM_BAD,

tools/include/uapi/linux/netdev.h

@@ -148,6 +148,7 @@ enum {
 	NETDEV_A_QSTATS_RX_ALLOC_FAIL,
 	NETDEV_A_QSTATS_RX_HW_DROPS,
 	NETDEV_A_QSTATS_RX_HW_DROP_OVERRUNS,
+	NETDEV_A_QSTATS_RX_CSUM_COMPLETE,
 	NETDEV_A_QSTATS_RX_CSUM_UNNECESSARY,
 	NETDEV_A_QSTATS_RX_CSUM_NONE,
 	NETDEV_A_QSTATS_RX_CSUM_BAD,