doc: add pcap dependency note to pdump guide

Added a missing note about dependencies on libpcap and
CONFIG_RTE_LIBRTE_PMD_PCAP flag that pdump tool has.

Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/guides/sample_app_ug/pdump.rst b/doc/guides/sample_app_ug/pdump.rst
index 9da6542..ceb038e 100644 (file)
--- a/doc/guides/sample_app_ug/pdump.rst
+++ b/doc/guides/sample_app_ug/pdump.rst
@@ -33,14 +33,23 @@
 dpdk_pdump Application
 ======================
 
-The ``dpdk_pdump`` application is a Data Plane Development Kit (DPDK) application that runs as a DPDK secondary process and
-is capable of enabling packet capture on dpdk ports.
+The ``dpdk_pdump`` tool is a Data Plane Development Kit (DPDK) tool that runs as
+a DPDK secondary process and is capable of enabling packet capture on dpdk ports.
+
+   .. Note::
+
+      * The ``dpdk_pdump`` tool depends on libpcap based PMD which is disabled
+        by default in the build configuration files,
+        owing to an external dependency on the libpcap development files
+        which must be installed on the board.
+        Once the libpcap development files are installed, the libpcap based PMD
+        can be enabled by setting CONFIG_RTE_LIBRTE_PMD_PCAP=y and recompiling the DPDK.
 
 
 Running the Application
 -----------------------
 
-The application has a number of command line options:
+The tool has a number of command line options:
 
 .. code-block:: console