X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fnics%2Ftap.rst;h=04086b11016754f84ae69f3c36c6ffa1e96375d4;hb=92a67a70fd8aa54213abe21424d0259d65cae2cd;hp=f3ee95d2897bbb7536547ea3e337a8af70489da6;hpb=f6921783fee6d9ba60bb2f36d69159aa35fccece;p=dpdk.git

diff --git a/doc/guides/nics/tap.rst b/doc/guides/nics/tap.rst
index f3ee95d289..04086b1101 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)