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doc: update pcap guide

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Add note about PMD expects the network interfaces provided to be up,
documented behavior to set expectations right.

Also added minor fix.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
This commit is contained in:
Ferruh Yigit 2018-01-17 18:30:39 +00:00
parent b26af79388
commit 380818b318
1 changed files with 7 additions and 1 deletions
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8
doc/guides/nics/pcap_ring.rst
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@ -5,7 +5,7 @@ Libpcap and Ring Based Poll Mode Drivers
========================================
In addition to Poll Mode Drivers (PMDs) for physical and virtual hardware,
the DPDK also includes two pure-software PMDs. These two drivers are:
the DPDK also includes pure-software PMDs, two of these drivers are:
* A libpcap -based PMD (librte_pmd_pcap) that reads and writes packets using libpcap,
- both from files on disk, as well as from physical NIC devices using standard Linux kernel drivers.
@ -148,6 +148,12 @@ Otherwise, the first 512 packets from the input pcap file will be discarded by t
--vdev 'net_pcap0,rx_pcap=file_rx.pcap,tx_pcap=file_tx.pcap' \
-- --port-topology=chained --no-flush-rx
.. note::
The network interface provided to the PMD should be up. The PMD will return
an error if interface is down, and the PMD itself won't change the status
of the external network interface.
Rings-based PMD
~~~~~~~~~~~~~~~