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-rw-r--r--doc/guides/nics/tap.rst9
1 files changed, 8 insertions, 1 deletions
diff --git a/doc/guides/nics/tap.rst b/doc/guides/nics/tap.rst
index f3ee95d2..04086b11 100644
--- a/doc/guides/nics/tap.rst
+++ b/doc/guides/nics/tap.rst
@@ -113,7 +113,14 @@ Flow API support
----------------
The tap PMD supports major flow API pattern items and actions, when running on
-linux kernels above 4.2 ("Flower" classifier required). Supported items:
+linux kernels above 4.2 ("Flower" classifier required).
+The kernel support can be checked with this command::
+
+ zcat /proc/config.gz | ( grep 'CLS_FLOWER=' || echo 'not supported' ) |
+ tee -a /dev/stderr | grep -q '=m' &&
+ lsmod | ( grep cls_flower || echo 'try modprobe cls_flower' )
+
+Supported items:
- eth: src and dst (with variable masks), and eth_type (0xffff mask).
- vlan: vid, pcp, tpid, but not eid. (requires kernel 4.9)