Implement basic and per-queue statistics collection. Usual statistics per queue: packets, bytes, errors.
The imissed counter reports kernel rx_dropped (packets dropped before reaching the interface) retrieved via netlink IFLA_STATS64. The rx_drop_base field captures the baseline value at stats_reset. Device info reports ifindex, max queue counts, and default burst/ring sizes. Signed-off-by: Stephen Hemminger <[email protected]> --- doc/guides/nics/features/rtap.ini | 2 + drivers/net/rtap/rtap.h | 2 + drivers/net/rtap/rtap_ethdev.c | 120 ++++++++++++++++++++++++++++++ 3 files changed, 124 insertions(+) diff --git a/doc/guides/nics/features/rtap.ini b/doc/guides/nics/features/rtap.ini index c064e1e0b9..9bef9e341d 100644 --- a/doc/guides/nics/features/rtap.ini +++ b/doc/guides/nics/features/rtap.ini @@ -5,6 +5,8 @@ ; [Features] Scattered Rx = P +Basic stats = Y +Stats per queue = Y Linux = Y ARMv7 = Y ARMv8 = Y diff --git a/drivers/net/rtap/rtap.h b/drivers/net/rtap/rtap.h index 823b8c59f7..abfde20e60 100644 --- a/drivers/net/rtap/rtap.h +++ b/drivers/net/rtap/rtap.h @@ -62,6 +62,8 @@ struct rtap_pmd { int if_index; /* interface index */ int nlsk_fd; /* netlink control socket */ struct rte_ether_addr eth_addr; /* address assigned by kernel */ + + uint64_t rx_drop_base; /* value of rx_dropped when reset */ }; /* rtap_ethdev.c */ diff --git a/drivers/net/rtap/rtap_ethdev.c b/drivers/net/rtap/rtap_ethdev.c index 463e24a6e1..888f8e7f39 100644 --- a/drivers/net/rtap/rtap_ethdev.c +++ b/drivers/net/rtap/rtap_ethdev.c @@ -2,6 +2,7 @@ * Copyright (c) 2026 Stephen Hemminger */ +#include <assert.h> #include <errno.h> #include <fcntl.h> #include <stdlib.h> @@ -11,6 +12,7 @@ #include <sys/ioctl.h> #include <net/if.h> #include <linux/if_tun.h> +#include <linux/if_link.h> #include <linux/virtio_net.h> #include <rte_config.h> @@ -29,6 +31,14 @@ #define RTAP_DEFAULT_IFNAME "rtap%d" +#define RTAP_DEFAULT_BURST 64 +#define RTAP_NUM_BUFFERS 1024 +#define RTAP_MAX_QUEUES 128 +#define RTAP_MIN_RX_BUFSIZE RTE_ETHER_MIN_LEN +#define RTAP_MAX_RX_PKTLEN RTE_ETHER_MAX_JUMBO_FRAME_LEN + +static_assert(RTAP_MAX_QUEUES <= RTE_MP_MAX_FD_NUM, "Max queues exceeds MP fd limit"); + #define RTAP_IFACE_ARG "iface" #define RTAP_PERSIST_ARG "persist" @@ -157,6 +167,112 @@ rtap_dev_configure(struct rte_eth_dev *dev) return 0; } +static int +rtap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) +{ + struct rtap_pmd *pmd = dev->data->dev_private; + + dev_info->if_index = pmd->if_index; + dev_info->max_mac_addrs = 1; + dev_info->max_rx_pktlen = RTAP_MAX_RX_PKTLEN; + dev_info->min_rx_bufsize = RTAP_MIN_RX_BUFSIZE; + dev_info->max_rx_queues = RTAP_MAX_QUEUES; + dev_info->max_tx_queues = RTAP_MAX_QUEUES; + + dev_info->default_rxportconf = (struct rte_eth_dev_portconf) { + .burst_size = RTAP_DEFAULT_BURST, + .ring_size = RTAP_NUM_BUFFERS, + .nb_queues = 1, + }; + dev_info->default_txportconf = (struct rte_eth_dev_portconf) { + .burst_size = RTAP_DEFAULT_BURST, + .ring_size = RTAP_NUM_BUFFERS, + .nb_queues = 1, + }; + return 0; +} + +static int +rtap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats, + struct eth_queue_stats *qstats) +{ + struct rtap_pmd *pmd = dev->data->dev_private; + struct rtnl_link_stats64 kstats; + uint16_t i; + + for (i = 0; i < dev->data->nb_rx_queues; i++) { + struct rtap_rx_queue *rxq = dev->data->rx_queues[i]; + if (rxq == NULL) + continue; + + stats->ipackets += rxq->rx_packets; + stats->ibytes += rxq->rx_bytes; + stats->ierrors += rxq->rx_errors; + + if (qstats != NULL && i < RTE_ETHDEV_QUEUE_STAT_CNTRS) { + qstats->q_ipackets[i] = rxq->rx_packets; + qstats->q_ibytes[i] = rxq->rx_bytes; + qstats->q_errors[i] = rxq->rx_errors; + } + } + + for (i = 0; i < dev->data->nb_tx_queues; i++) { + struct rtap_tx_queue *txq = dev->data->tx_queues[i]; + if (txq == NULL) + continue; + + stats->opackets += txq->tx_packets; + stats->obytes += txq->tx_bytes; + stats->oerrors += txq->tx_errors; + + if (qstats != NULL && i < RTE_ETHDEV_QUEUE_STAT_CNTRS) { + qstats->q_opackets[i] = txq->tx_packets; + qstats->q_obytes[i] = txq->tx_bytes; + } + } + + /* Get kernel rx_dropped counter via netlink */ + if (rtap_nl_get_stats(pmd->if_index, &kstats) == 0 && + kstats.rx_dropped > pmd->rx_drop_base) + stats->imissed = kstats.rx_dropped - pmd->rx_drop_base; + + return 0; +} + +static int +rtap_stats_reset(struct rte_eth_dev *dev) +{ + struct rtap_pmd *pmd = dev->data->dev_private; + struct rtnl_link_stats64 kstats; + uint16_t i; + + for (i = 0; i < dev->data->nb_rx_queues; i++) { + struct rtap_rx_queue *rxq = dev->data->rx_queues[i]; + if (rxq == NULL) + continue; + + rxq->rx_packets = 0; + rxq->rx_bytes = 0; + rxq->rx_errors = 0; + } + + for (i = 0; i < dev->data->nb_tx_queues; i++) { + struct rtap_tx_queue *txq = dev->data->tx_queues[i]; + if (txq == NULL) + continue; + + txq->tx_packets = 0; + txq->tx_bytes = 0; + txq->tx_errors = 0; + } + + /* Capture current rx_dropped as baseline via netlink */ + if (rtap_nl_get_stats(pmd->if_index, &kstats) == 0) + pmd->rx_drop_base = kstats.rx_dropped; + + return 0; +} + static int rtap_dev_close(struct rte_eth_dev *dev) { @@ -247,7 +363,10 @@ static const struct eth_dev_ops rtap_ops = { .dev_start = rtap_dev_start, .dev_stop = rtap_dev_stop, .dev_configure = rtap_dev_configure, + .dev_infos_get = rtap_dev_info, .dev_close = rtap_dev_close, + .stats_get = rtap_stats_get, + .stats_reset = rtap_stats_reset, .rx_queue_setup = rtap_rx_queue_setup, .rx_queue_release = rtap_rx_queue_release, .tx_queue_setup = rtap_tx_queue_setup, @@ -262,6 +381,7 @@ rtap_create(struct rte_eth_dev *dev, const char *tap_name, uint8_t persist) pmd->keep_fd = -1; pmd->nlsk_fd = -1; + pmd->rx_drop_base = 0; dev->dev_ops = &rtap_ops; -- 2.51.0
