doc: add note for --txqflags in testpmd

Since txqflags is now set from the default rx/tx configuration,
depending on the PMD, it might not be 0.
Therefore, user has to overwrite it with --txqflags 0.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Siobhan Butler <siobhan.a.butler@intel.com>

diff --git a/doc/guides/testpmd_app_ug/run_app.rst b/doc/guides/testpmd_app_ug/run_app.rst
index 6cbbf40..b29c176 100644 (file)
--- a/doc/guides/testpmd_app_ug/run_app.rst
+++ b/doc/guides/testpmd_app_ug/run_app.rst
@@ -405,6 +405,12 @@ They must be separated from the EAL options, shown in the previous section, with
     Set the hexadecimal bitmask of TX queue flags, where 0 <= N <= 0x7FFFFFFF.
     The default value is 0.
 
+    Note::
+
+        When using hardware offload functions such as vlan, checksum...,
+        add txqflags=0, since depending on the PMD,
+        txqflags might be set to a non-zero value.
+
 *   --rx-queue-stats-mapping=(port,queue,mapping)[,(port,queue,mapping)]
 
     Set the RX queues statistics counters mapping 0 <= mapping <= 15.