[PATCH v15 15/18] net/pcap: add snapshot length devarg

Stephen Hemminger
2026-02-13T17:05:35Z

Add a new devarg 'snaplen' to configure the pcap snapshot length,
which controls the maximum packet size for capture and output.

The snapshot length affects:
- The pcap_set_snaplen() call when capturing from interfaces
- The pcap_open_dead() snapshot parameter for output files
- The reported max_rx_pktlen in device info
- The reported max_mtu in device info (snaplen - ethernet header)

The default value is 65535 bytes, preserving backward compatibility
with previous driver behavior.

Example usage:
--vdev 'net_pcap0,iface=eth0,snaplen=1518'
--vdev 'net_pcap0,rx_pcap=in.pcap,tx_pcap=out.pcap,snaplen=9000'

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
doc/guides/nics/pcap.rst | 15 ++
doc/guides/rel_notes/release_26_03.rst | 1 +
drivers/net/pcap/pcap_ethdev.c | 235 ++++++++++++++++---------
3 files changed, 165 insertions(+), 86 deletions(-)

diff --git a/doc/guides/nics/pcap.rst b/doc/guides/nics/pcap.rst
index 2709c6d017..f241069ebb 100644
--- a/doc/guides/nics/pcap.rst
+++ b/doc/guides/nics/pcap.rst
@@ -162,6 +162,21 @@ Runtime Config Options

In this case, one dummy Rx queue is created for each Tx queue argument passed.

+* Set the snapshot length for packet capture
+
+ The snapshot length controls the maximum number of bytes captured per packet.
+ This affects both interface capture and pcap file output. The default value is
+ 65535 bytes, which captures complete packets up to the maximum Ethernet jumbo
+ frame size. Reducing this value can improve performance when only packet headers
+ are needed. This can be done with the ``snaplen`` devarg, for example::
+
+ --vdev 'net_pcap0,iface=eth0,snaplen=1518'
+ --vdev 'net_pcap0,rx_pcap=in.pcap,tx_pcap=out.pcap,snaplen=9000'
+
+ The snapshot length also determines the reported ``max_rx_pktlen``
+ and ``max_mtu`` in device info.
+
+
Examples of Usage
~~~~~~~~~~~~~~~~~

diff --git a/doc/guides/rel_notes/release_26_03.rst b/doc/guides/rel_notes/release_26_03.rst
index e7782dee20..70179a454e 100644
--- a/doc/guides/rel_notes/release_26_03.rst
+++ b/doc/guides/rel_notes/release_26_03.rst
@@ -93,6 +93,7 @@ New Features
* Added support for reporting link state and speed in ``iface`` mode.
* Receive timestamp offload is only done if offload flag set.
* Receive timestamps support nanosecond precision.
+ * Added ``snaplen`` devarg to configure packet capture snapshot length.

Removed Items
diff --git a/drivers/net/pcap/pcap_ethdev.c b/drivers/net/pcap/pcap_ethdev.c
index f2f05689ca..e9200f9aac 100644
--- a/drivers/net/pcap/pcap_ethdev.c
+++ b/drivers/net/pcap/pcap_ethdev.c
@@ -14,6 +14,7 @@
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
+#include <net/if.h>
#include <pcap.h>

#include <rte_cycles.h>
@@ -32,8 +33,6 @@

#include "pcap_osdep.h"

-#define RTE_ETH_PCAP_SNAPSHOT_LEN 65535
-
#define ETH_PCAP_RX_PCAP_ARG "rx_pcap"
#define ETH_PCAP_TX_PCAP_ARG "tx_pcap"
#define ETH_PCAP_RX_IFACE_ARG "rx_iface"
@@ -42,6 +41,12 @@
#define ETH_PCAP_IFACE_ARG "iface"
#define ETH_PCAP_PHY_MAC_ARG "phy_mac"
#define ETH_PCAP_INFINITE_RX_ARG "infinite_rx"
+#define ETH_PCAP_SNAPSHOT_LEN_ARG "snaplen"
+
+#define ETH_PCAP_SNAPSHOT_LEN_DEFAULT 65535
+
+/* This is defined in libpcap but not exposed in headers */
+#define ETH_PCAP_MAXIMUM_SNAPLEN 262144

#define ETH_PCAP_ARG_MAXLEN 64

@@ -102,6 +107,7 @@ struct pmd_internals {
char devargs[ETH_PCAP_ARG_MAXLEN];
struct rte_ether_addr eth_addr;
int if_index;
+ uint32_t snapshot_len;
bool single_iface;
bool phy_mac;
bool infinite_rx;
@@ -129,6 +135,7 @@ struct pmd_devargs {
struct pmd_devargs_all {
struct pmd_devargs rx_queues;
struct pmd_devargs tx_queues;
+ uint32_t snapshot_len;
bool single_iface;
bool is_tx_pcap;
bool is_tx_iface;
@@ -146,11 +153,16 @@ static const char *valid_arguments[] = {
ETH_PCAP_IFACE_ARG,
ETH_PCAP_PHY_MAC_ARG,
ETH_PCAP_INFINITE_RX_ARG,
+ ETH_PCAP_SNAPSHOT_LEN_ARG,
NULL
};

RTE_LOG_REGISTER_DEFAULT(eth_pcap_logtype, NOTICE);

+/* Forward declaration */
+static inline int set_iface_direction(const char *iface, pcap_t *pcap,
+ pcap_direction_t direction);
+
static struct queue_missed_stat*
queue_missed_stat_update(struct rte_eth_dev *dev, unsigned int qid)
{
@@ -466,20 +478,19 @@ eth_pcap_tx_vlan(struct pcap_tx_queue *tx_queue, struct rte_mbuf **mbuf)
static uint16_t
eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
- unsigned int i;
- struct pmd_process_private *pp;
struct pcap_tx_queue *dumper_q = queue;
+ struct rte_eth_dev *dev = &rte_eth_devices[dumper_q->port_id];
+ struct pmd_internals *internals = dev->data->dev_private;
+ struct pmd_process_private *pp = dev->process_private;
+ pcap_dumper_t *dumper = pp->tx_dumper[dumper_q->queue_id];
+ unsigned char *temp_data = dumper_q->bounce_buf;
+ uint32_t snaplen = internals->snapshot_len;
uint16_t num_tx = 0;
uint32_t tx_bytes = 0;
struct pcap_pkthdr header;
- pcap_dumper_t *dumper;
- unsigned char *temp_data;
-
- pp = rte_eth_devices[dumper_q->port_id].process_private;
- dumper = pp->tx_dumper[dumper_q->queue_id];
- temp_data = dumper_q->bounce_buf;
+ unsigned int i;

- if (dumper == NULL || nb_pkts == 0)
+ if (unlikely(dumper == NULL))
return 0;

/* all packets in burst have same timestamp */
@@ -487,14 +498,15 @@ eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)

/* writes the nb_pkts packets to the previously opened pcap file dumper */
for (i = 0; i < nb_pkts; i++) {
- uint32_t len, caplen;
const uint8_t *data;

if (eth_pcap_tx_vlan(dumper_q, &bufs[i]) < 0)
continue;

struct rte_mbuf *mbuf = bufs[i];
- len = caplen = rte_pktmbuf_pkt_len(mbuf);
+ uint32_t len = rte_pktmbuf_pkt_len(mbuf);
+ uint32_t caplen = RTE_MIN(len, snaplen);
+
header.len = len;
header.caplen = caplen;

@@ -563,19 +575,18 @@ eth_tx_drop(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
static uint16_t
eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
- unsigned int i;
- struct pmd_process_private *pp;
struct pcap_tx_queue *tx_queue = queue;
+ struct rte_eth_dev *dev = &rte_eth_devices[tx_queue->port_id];
+ struct pmd_internals *internals = dev->data->dev_private;
+ struct pmd_process_private *pp = dev->process_private;
+ pcap_t *pcap = pp->tx_pcap[tx_queue->queue_id];
+ unsigned char *temp_data = tx_queue->bounce_buf;
+ uint32_t snaplen = internals->snapshot_len;
uint16_t num_tx = 0;
uint32_t tx_bytes = 0;
- pcap_t *pcap;
- unsigned char *temp_data;
-
- pp = rte_eth_devices[tx_queue->port_id].process_private;
- pcap = pp->tx_pcap[tx_queue->queue_id];
- temp_data = tx_queue->bounce_buf;
+ unsigned int i;

- if (unlikely(nb_pkts == 0 || pcap == NULL))
+ if (unlikely(pcap == NULL))
return 0;

for (i = 0; i < nb_pkts; i++) {
@@ -586,10 +597,10 @@ eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
uint32_t len = rte_pktmbuf_pkt_len(mbuf);
const uint8_t *data;

- if (unlikely(!rte_pktmbuf_is_contiguous(mbuf) && len > RTE_ETH_PCAP_SNAPSHOT_LEN)) {
+ if (unlikely(!rte_pktmbuf_is_contiguous(mbuf) && len > snaplen)) {
PMD_TX_LOG(ERR,
"Dropping multi segment PCAP packet. Size (%u) > max size (%u).",
- len, RTE_ETH_PCAP_SNAPSHOT_LEN);
+ len, snaplen);
tx_queue->tx_stat.err_pkts++;
rte_pktmbuf_free(mbuf);
continue;
@@ -623,7 +634,7 @@ eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
* pcap_open_live wrapper function
*/
static inline int
-open_iface_live(const char *iface, pcap_t **pcap)
+open_iface_live(const char *iface, pcap_t **pcap, uint32_t snaplen)
{
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pc;
@@ -652,7 +663,7 @@ open_iface_live(const char *iface, pcap_t **pcap)
PMD_LOG(WARNING, "%s: Could not set to promiscuous: %s",
iface, pcap_statustostr(status));

- status = pcap_set_snaplen(pc, RTE_ETH_PCAP_SNAPSHOT_LEN);
+ status = pcap_set_snaplen(pc, snaplen);
if (status != 0)
PMD_LOG(WARNING, "%s: Could not set snapshot length: %s",
iface, pcap_statustostr(status));
@@ -666,6 +677,9 @@ open_iface_live(const char *iface, pcap_t **pcap)
else
PMD_LOG(ERR, "%s: %s (%s)", iface, pcap_statustostr(status), cp);
goto error;
+ } else if (status > 0) {
+ /* Warning condition - log but continue */
+ PMD_LOG(WARNING, "%s: %s", iface, pcap_statustostr(status));
}

/*
@@ -694,9 +708,9 @@ open_iface_live(const char *iface, pcap_t **pcap)
}

static int
-open_single_iface(const char *iface, pcap_t **pcap)
+open_single_iface(const char *iface, pcap_t **pcap, uint32_t snaplen)
{
- if (open_iface_live(iface, pcap) < 0) {
+ if (open_iface_live(iface, pcap, snaplen) < 0) {
PMD_LOG(ERR, "Couldn't open interface %s", iface);
return -1;
}
@@ -705,7 +719,8 @@ open_single_iface(const char *iface, pcap_t **pcap)
}

static int
-open_single_tx_pcap(const char *pcap_filename, pcap_dumper_t **dumper)
+open_single_tx_pcap(const char *pcap_filename, pcap_dumper_t **dumper,
+ uint32_t snaplen)
{
pcap_t *tx_pcap;

@@ -715,7 +730,7 @@ open_single_tx_pcap(const char *pcap_filename, pcap_dumper_t **dumper)
* pcap holder.
*/
tx_pcap = pcap_open_dead_with_tstamp_precision(DLT_EN10MB,
- RTE_ETH_PCAP_SNAPSHOT_LEN, PCAP_TSTAMP_PRECISION_NANO);
+ snaplen, PCAP_TSTAMP_PRECISION_NANO);
if (tx_pcap == NULL) {
PMD_LOG(ERR, "Couldn't create dead pcap");
return -1;
@@ -724,9 +739,9 @@ open_single_tx_pcap(const char *pcap_filename, pcap_dumper_t **dumper)
/* The dumper is created using the previous pcap_t reference */
*dumper = pcap_dump_open(tx_pcap, pcap_filename);
if (*dumper == NULL) {
+ PMD_LOG(ERR, "Couldn't open %s for writing: %s",
+ pcap_filename, pcap_geterr(tx_pcap));
pcap_close(tx_pcap);
- PMD_LOG(ERR, "Couldn't open %s for writing.",
- pcap_filename);
return -1;
}

@@ -776,15 +791,15 @@ eth_dev_start(struct rte_eth_dev *dev)
struct pmd_process_private *pp = dev->process_private;
struct pcap_tx_queue *tx;
struct pcap_rx_queue *rx;
+ uint32_t snaplen = internals->snapshot_len;

/* Special iface case. Single pcap is open and shared between tx/rx. */
if (internals->single_iface) {
tx = &internals->tx_queue[0];
rx = &internals->rx_queue[0];

- if (!pp->tx_pcap[0] &&
- strcmp(tx->type, ETH_PCAP_IFACE_ARG) == 0) {
- if (open_single_iface(tx->name, &pp->tx_pcap[0]) < 0)
+ if (!pp->tx_pcap[0] && strcmp(tx->type, ETH_PCAP_IFACE_ARG) == 0) {
+ if (open_single_iface(tx->name, &pp->tx_pcap[0], snaplen) < 0)
return -1;
pp->rx_pcap[0] = pp->tx_pcap[0];
}
@@ -796,14 +811,11 @@ eth_dev_start(struct rte_eth_dev *dev)
for (i = 0; i < dev->data->nb_tx_queues; i++) {
tx = &internals->tx_queue[i];

- if (!pp->tx_dumper[i] &&
- strcmp(tx->type, ETH_PCAP_TX_PCAP_ARG) == 0) {
- if (open_single_tx_pcap(tx->name,
- &pp->tx_dumper[i]) < 0)
+ if (!pp->tx_dumper[i] && strcmp(tx->type, ETH_PCAP_TX_PCAP_ARG) == 0) {
+ if (open_single_tx_pcap(tx->name, &pp->tx_dumper[i], snaplen) < 0)
return -1;
- } else if (!pp->tx_pcap[i] &&
- strcmp(tx->type, ETH_PCAP_TX_IFACE_ARG) == 0) {
- if (open_single_iface(tx->name, &pp->tx_pcap[i]) < 0)
+ } else if (!pp->tx_pcap[i] && strcmp(tx->type, ETH_PCAP_TX_IFACE_ARG) == 0) {
+ if (open_single_iface(tx->name, &pp->tx_pcap[i], snaplen) < 0)
return -1;
}
}
@@ -818,9 +830,14 @@ eth_dev_start(struct rte_eth_dev *dev)
if (strcmp(rx->type, ETH_PCAP_RX_PCAP_ARG) == 0) {
if (open_single_rx_pcap(rx->name, &pp->rx_pcap[i]) < 0)
return -1;
- } else if (strcmp(rx->type, ETH_PCAP_RX_IFACE_ARG) == 0) {
- if (open_single_iface(rx->name, &pp->rx_pcap[i]) < 0)
+ } else if (strcmp(rx->type, ETH_PCAP_RX_IFACE_ARG) == 0 ||
+ strcmp(rx->type, ETH_PCAP_RX_IFACE_IN_ARG) == 0) {
+ if (open_single_iface(rx->name, &pp->rx_pcap[i], snaplen) < 0)
return -1;
+ /* Set direction for rx_iface_in */
+ if (strcmp(rx->type, ETH_PCAP_RX_IFACE_IN_ARG) == 0)
+ set_iface_direction(rx->name, pp->rx_pcap[i],
+ PCAP_D_IN);
}
}

@@ -911,11 +928,11 @@ eth_dev_info(struct rte_eth_dev *dev,

dev_info->if_index = internals->if_index;
dev_info->max_mac_addrs = 1;
- dev_info->max_rx_pktlen = RTE_ETH_PCAP_SNAPSHOT_LEN;
+ dev_info->max_rx_pktlen = internals->snapshot_len;
dev_info->max_rx_queues = dev->data->nb_rx_queues;
dev_info->max_tx_queues = dev->data->nb_tx_queues;
- dev_info->min_rx_bufsize = 0;
- dev_info->max_mtu = RTE_ETH_PCAP_SNAPSHOT_LEN - RTE_ETHER_HDR_LEN;
+ dev_info->min_rx_bufsize = RTE_ETHER_MIN_LEN;
+ dev_info->max_mtu = internals->snapshot_len - RTE_ETHER_HDR_LEN;
dev_info->tx_offload_capa = RTE_ETH_TX_OFFLOAD_MULTI_SEGS |
RTE_ETH_TX_OFFLOAD_VLAN_INSERT;
dev_info->rx_offload_capa = RTE_ETH_RX_OFFLOAD_VLAN_STRIP |
@@ -1228,7 +1245,7 @@ eth_tx_queue_setup(struct rte_eth_dev *dev,

pcap_q->port_id = dev->data->port_id;
pcap_q->queue_id = tx_queue_id;
- pcap_q->bounce_buf = rte_malloc_socket(NULL, RTE_ETH_PCAP_SNAPSHOT_LEN,
+ pcap_q->bounce_buf = rte_malloc_socket(NULL, internals->snapshot_len,
RTE_CACHE_LINE_SIZE, socket_id);
if (pcap_q->bounce_buf == NULL)
return -ENOMEM;
@@ -1358,6 +1375,12 @@ open_rx_pcap(const char *key, const char *value, void *extra_args)
struct pmd_devargs *rx = extra_args;
pcap_t *pcap = NULL;

+ if (access(pcap_filename, R_OK) != 0) {
+ PMD_LOG(ERR, "Cannot read pcap file '%s': %s",
+ pcap_filename, strerror(errno));
+ return -1;
+ }
+
if (open_single_rx_pcap(pcap_filename, &pcap) < 0)
return -1;

@@ -1370,41 +1393,53 @@ open_rx_pcap(const char *key, const char *value, void *extra_args)
}

/*
- * Opens a pcap file for writing and stores a reference to it
- * for use it later on.
+ * Store TX pcap file configuration.
+ * The actual pcap dumper is opened in eth_dev_start().
*/
static int
open_tx_pcap(const char *key, const char *value, void *extra_args)
{
const char *pcap_filename = value;
struct pmd_devargs *dumpers = extra_args;
- pcap_dumper_t *dumper;
+ FILE *f;

- if (open_single_tx_pcap(pcap_filename, &dumper) < 0)
+ /* Validate that pcap_filename can be created. */
+ if (strcmp(pcap_filename, "-") == 0) {
+ /* This isn't going to work very well in DPDK - so reject it */
+ PMD_LOG(ERR, "Sending pcap binary data to stdout is not supported");
return -1;
+ }

- if (add_queue(dumpers, pcap_filename, key, NULL, dumper) < 0) {
- pcap_dump_close(dumper);
+ f = fopen(pcap_filename, "wb");
+ if (f == NULL) {
+ PMD_LOG(ERR, "Cannot open '%s' for writing: %s", pcap_filename, strerror(errno));
return -1;
}
+ fclose(f);
+
+ if (add_queue(dumpers, pcap_filename, key, NULL, NULL) < 0)
+ return -1;

return 0;
}

/*
- * Opens an interface for reading and writing
+ * Store interface configuration for reading and writing.
+ * The actual pcap handle is opened in eth_dev_start().
*/
static inline int
open_rx_tx_iface(const char *key, const char *value, void *extra_args)
{
const char *iface = value;
struct pmd_devargs *tx = extra_args;
- pcap_t *pcap = NULL;

- if (open_single_iface(iface, &pcap) < 0)
+ if (if_nametoindex(iface) == 0) {
+ PMD_LOG(ERR, "Interface '%s' not found: %s",
+ iface, strerror(errno));
return -1;
+ }

- tx->queue[0].pcap = pcap;
+ tx->queue[0].pcap = NULL;
tx->queue[0].name = iface;
tx->queue[0].type = key;

@@ -1426,50 +1461,38 @@ set_iface_direction(const char *iface, pcap_t *pcap,
return 0;
}

+/*
+ * Store interface configuration.
+ * The actual pcap handle is opened in eth_dev_start().
+ */
static inline int
open_iface(const char *key, const char *value, void *extra_args)
{
const char *iface = value;
struct pmd_devargs *pmd = extra_args;
- pcap_t *pcap = NULL;

- if (open_single_iface(iface, &pcap) < 0)
- return -1;
- if (add_queue(pmd, iface, key, pcap, NULL) < 0) {
- pcap_close(pcap);
+ if (if_nametoindex(iface) == 0) {
+ PMD_LOG(ERR, "Interface '%s' not found: %s",
+ iface, strerror(errno));
return -1;
}

+ if (add_queue(pmd, iface, key, NULL, NULL) < 0)
+ return -1;
+
return 0;
}

/*
- * Opens a NIC for reading packets from it
+ * Store RX interface configuration.
+ * The actual pcap handle is opened and direction set in eth_dev_start().
*/
-static inline int
-open_rx_iface(const char *key, const char *value, void *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);
+ strcmp(key, ETH_PCAP_RX_IFACE_IN_ARG) == 0)
+ return open_iface(key, value, extra_args);

return 0;
}
@@ -1501,6 +1524,31 @@ process_bool_flag(const char *key, const char *value, void *extra_args)
return 0;
}

+static int
+process_snapshot_len(const char *key, const char *value, void *extra_args)
+{
+ uint32_t *snaplen = extra_args;
+ unsigned long val;
+ char *endptr;
+
+ if (value == NULL || *value == '\0') {
+ PMD_LOG(ERR, "Argument '%s' requires a value", key);
+ return -1;
+ }
+
+ errno = 0;
+ val = strtoul(value, &endptr, 10);
+ if (errno != 0 || *endptr != '\0' ||
+ val < RTE_ETHER_HDR_LEN ||
+ val > ETH_PCAP_MAXIMUM_SNAPLEN) {
+ PMD_LOG(ERR, "Invalid '%s' value '%s'", key, value);
+ return -1;
+ }
+
+ *snaplen = (uint32_t)val;
+ return 0;
+}
+
static int
pmd_init_internals(struct rte_vdev_device *vdev,
const unsigned int nb_rx_queues,
@@ -1665,6 +1713,8 @@ eth_from_pcaps(struct rte_vdev_device *vdev,
}

internals->infinite_rx = infinite_rx;
+ internals->snapshot_len = devargs_all->snapshot_len;
+
/* Assign rx ops. */
if (infinite_rx)
eth_dev->rx_pkt_burst = eth_pcap_rx_infinite;
@@ -1725,6 +1775,7 @@ pmd_pcap_probe(struct rte_vdev_device *dev)
int ret = 0;

struct pmd_devargs_all devargs_all = {
+ .snapshot_len = ETH_PCAP_SNAPSHOT_LEN_DEFAULT,
.single_iface = 0,
.is_tx_pcap = 0,
.is_tx_iface = 0,
@@ -1772,7 +1823,18 @@ pmd_pcap_probe(struct rte_vdev_device *dev)
}

/*
- * If iface argument is passed we open the NICs and use them for
+ * Process optional snapshot length argument.
+ */
+ if (rte_kvargs_count(kvlist, ETH_PCAP_SNAPSHOT_LEN_ARG) == 1) {
+ ret = rte_kvargs_process(kvlist, ETH_PCAP_SNAPSHOT_LEN_ARG,
+ &process_snapshot_len,
+ &devargs_all.snapshot_len);
+ if (ret < 0)
+ goto free_kvlist;
+ }
+
+ /*
+ * If iface argument is passed we check that NIC can be used
* reading / writing
*/
if (rte_kvargs_count(kvlist, ETH_PCAP_IFACE_ARG) == 1) {
@@ -1977,4 +2039,5 @@ RTE_PMD_REGISTER_PARAM_STRING(net_pcap,
ETH_PCAP_TX_IFACE_ARG "=<ifc> "
ETH_PCAP_IFACE_ARG "=<ifc> "
ETH_PCAP_PHY_MAC_ARG "=<0|1> "
- ETH_PCAP_INFINITE_RX_ARG "=<0|1>");
+ ETH_PCAP_INFINITE_RX_ARG "=<0|1> "
+ ETH_PCAP_SNAPSHOT_LEN_ARG "=<int>");
--
2.51.0