From: ido g <i...@cgstowernetworks.com>
Support rx of in direction packets only
Useful for apps that also tx to eth_pcap ports in order to not see them
echoed back in as rx when out direction is also captured
Example:
In case using rx_iface and sending *single* packet to eth1
it will loop forever as the when it is sent to tx_iface=eth1
it will be captured again on the rx_iface=eth1 and so on
$RTE_TARGET/app/testpmd l 0-3 -n 4 \
--vdev 'net_pcap0,rx_iface=eth1,tx_iface=eth1'
…
---------------------- Forward statistics for port 0 ------------
RX-packets: 758 RX-dropped: 0 RX-total: 758
TX-packets: 758 TX-dropped: 0 TX-total: 758
------------------------------------------------------------------
While if using rx_iface_in it will not be captured on the way out and
be forwarded only once
$RTE_TARGET/app/testpmd l 0-3 -n 4 \
--vdev 'net_pcap0,rx_iface_in=eth1,tx_iface=eth1'
…
---------------------- Forward statistics for port 0 ------------
RX-packets: 1 RX-dropped: 0 RX-total: 1
TX-packets: 1 TX-dropped: 0 TX-total: 1
------------------------------------------------------------------
Signed-off-by: ido g <i...@cgstowernetworks.com>
---
v4:
* fix order of rx_face and rx_iface_in mix
* reward pcap_ring doc example
* cosmetics code alignments
* adding example commands in commit log
v3:
* merge to updated dpdk-next-net code
* pcap_ring doc update
v2:
* clean checkpatch warning
doc/guides/nics/pcap_ring.rst | 25 +++++++++++++++++++-
drivers/net/pcap/rte_eth_pcap.c | 51 +++++++++++++++++++++++++++++++++++++----
2 files changed, 70 insertions(+), 6 deletions(-)
diff --git a/doc/guides/nics/pcap_ring.rst b/doc/guides/nics/pcap_ring.rst
index 7fd063c..879e543 100644
--- a/doc/guides/nics/pcap_ring.rst
+++ b/doc/guides/nics/pcap_ring.rst
@@ -71,11 +71,19 @@ The different stream types are:
tx_pcap=/path/to/file.pcap
* rx_iface: Defines a reception stream based on a network interface name.
- The driver reads packets coming from the given interface using the Linux
kernel driver for that interface.
+ The driver reads packets from the given interface using the Linux kernel
driver for that interface.
+ The driver captures both the incoming and outgoing packets on that
interface.
The value is an interface name.
rx_iface=eth0
+* rx_iface_in: Defines a reception stream based on a network interface name.
+ The driver reads packets from the given interface using the Linux kernel
driver for that interface.
+ The driver captures only the incoming packets on that interface.
+ The value is an interface name.
+
+ rx_iface_in=eth0
+
* tx_iface: Defines a transmission stream based on a network interface name.
The driver sends packets to the given interface using the Linux kernel
driver for that interface.
The value is an interface name.
@@ -122,6 +130,21 @@ Forward packets through two network interfaces:
$RTE_TARGET/app/testpmd -l 0-3 -n 4 \
--vdev 'net_pcap0,iface=eth0' --vdev='net_pcap1;iface=eth1'
+Enable 2 tx queues on a network interface:
+
+.. code-block:: console
+
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ --vdev 'net_pcap0,rx_iface=eth1,tx_iface=eth1,tx_iface=eth1' \
+ -- --txq 2
+
+Read only incoming packets from a network interface and write them back to the
same network interface:
+
+.. code-block:: console
+
+ $RTE_TARGET/app/testpmd -l 0-3 -n 4 \
+ --vdev 'net_pcap0,rx_iface_in=eth1,tx_iface=eth1'
+
Using libpcap-based PMD with the testpmd Application
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/drivers/net/pcap/rte_eth_pcap.c b/drivers/net/pcap/rte_eth_pcap.c
index b21930b..0a89b24 100644
--- a/drivers/net/pcap/rte_eth_pcap.c
+++ b/drivers/net/pcap/rte_eth_pcap.c
@@ -26,6 +26,7 @@
#define ETH_PCAP_RX_PCAP_ARG "rx_pcap"
#define ETH_PCAP_TX_PCAP_ARG "tx_pcap"
#define ETH_PCAP_RX_IFACE_ARG "rx_iface"
+#define ETH_PCAP_RX_IFACE_IN_ARG "rx_iface_in"
#define ETH_PCAP_TX_IFACE_ARG "tx_iface"
#define ETH_PCAP_IFACE_ARG "iface"
@@ -83,6 +84,7 @@ struct pmd_devargs {
ETH_PCAP_RX_PCAP_ARG,
ETH_PCAP_TX_PCAP_ARG,
ETH_PCAP_RX_IFACE_ARG,
+ ETH_PCAP_RX_IFACE_IN_ARG,
ETH_PCAP_TX_IFACE_ARG,
ETH_PCAP_IFACE_ARG,
NULL
@@ -739,6 +741,21 @@ struct pmd_devargs {
}
static inline int
+set_iface_direction(const char *iface, pcap_t *pcap,
+ pcap_direction_t direction)
+{
+ const char *direction_str = (direction == PCAP_D_IN) ? "IN" : "OUT";
+ if (pcap_setdirection(pcap, direction) < 0) {
+ PMD_LOG(ERR, "Setting %s pcap direction %s failed - %s\n",
+ iface, direction_str, pcap_geterr(pcap));
+ return -1;
+ }
+ PMD_LOG(INFO, "Setting %s pcap direction %s\n",
+ iface, direction_str);
+ return 0;
+}
+
+static inline int
open_iface(const char *key, const char *value, void *extra_args)
{
const char *iface = value;
@@ -761,7 +778,29 @@ struct pmd_devargs {
static inline int
open_rx_iface(const char *key, const char *value, void *extra_args)
{
- return open_iface(key, value, extra_args);
+ int ret = open_iface(key, value, extra_args);
+ if (ret < 0)
+ return ret;
+ if (strcmp(key, ETH_PCAP_RX_IFACE_IN_ARG) == 0) {
+ struct pmd_devargs *pmd = extra_args;
+ unsigned int qid = pmd->num_of_queue - 1;
+
+ set_iface_direction(pmd->queue[qid].name,
+ pmd->queue[qid].pcap,
+ PCAP_D_IN);
+ }
+
+ return 0;
+}
+
+static inline int
+rx_iface_args_process(const char *key, const char *value, void *extra_args)
+{
+ if (strcmp(key, ETH_PCAP_RX_IFACE_ARG) == 0 ||
+ strcmp(key, ETH_PCAP_RX_IFACE_IN_ARG) == 0)
+ return open_rx_iface(key, value, extra_args);
+
+ return 0;
}
/*
@@ -964,12 +1003,13 @@ struct pmd_devargs {
is_rx_pcap = rte_kvargs_count(kvlist, ETH_PCAP_RX_PCAP_ARG) ? 1 : 0;
pcaps.num_of_queue = 0;
- if (is_rx_pcap)
+ if (is_rx_pcap) {
ret = rte_kvargs_process(kvlist, ETH_PCAP_RX_PCAP_ARG,
&open_rx_pcap, &pcaps);
- else
- ret = rte_kvargs_process(kvlist, ETH_PCAP_RX_IFACE_ARG,
- &open_rx_iface, &pcaps);
+ } else {
+ ret = rte_kvargs_process(kvlist, NULL,
+ &rx_iface_args_process, &pcaps);
+ }
if (ret < 0)
goto free_kvlist;
@@ -1035,6 +1075,7 @@ struct pmd_devargs {
ETH_PCAP_RX_PCAP_ARG "=<string> "
ETH_PCAP_TX_PCAP_ARG "=<string> "
ETH_PCAP_RX_IFACE_ARG "=<ifc> "
+ ETH_PCAP_RX_IFACE_IN_ARG "=<ifc> "
ETH_PCAP_TX_IFACE_ARG "=<ifc> "
ETH_PCAP_IFACE_ARG "=<ifc>");
--
1.9.1
