[PATCH v12 08/19] net/pcap: cleanup transmit buffer handling
From: Stephen Hemminger <stephen@networkplumber.org>
Date: 2026-02-02 23:13:44
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The transmit loops should handle the possible failure of rte_pktmbuf_read(). If a pcap_sendpacket fails, then the packet with error should be freed. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> --- drivers/net/pcap/pcap_ethdev.c | 60 ++++++++++++++++++---------------- 1 file changed, 32 insertions(+), 28 deletions(-)
diff --git a/drivers/net/pcap/pcap_ethdev.c b/drivers/net/pcap/pcap_ethdev.c
index a89379ea9c..0aa3d67e4d 100644
--- a/drivers/net/pcap/pcap_ethdev.c
+++ b/drivers/net/pcap/pcap_ethdev.c@@ -389,7 +389,6 @@ static uint16_t eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) { unsigned int i; - struct rte_mbuf *mbuf; struct pmd_process_private *pp; struct pcap_tx_queue *dumper_q = queue; uint16_t num_tx = 0;
@@ -397,7 +396,6 @@ eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) struct pcap_pkthdr header; pcap_dumper_t *dumper; unsigned char *temp_data; - size_t len, caplen; pp = rte_eth_devices[dumper_q->port_id].process_private; dumper = pp->tx_dumper[dumper_q->queue_id];
@@ -409,21 +407,22 @@ 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++) { - mbuf = bufs[i]; + struct rte_mbuf *mbuf = bufs[i]; + uint32_t len, caplen; + const uint8_t *data; + len = caplen = rte_pktmbuf_pkt_len(mbuf); calculate_timestamp(&header.ts); header.len = len; header.caplen = caplen; - /* rte_pktmbuf_read() returns a pointer to the data directly - * in the mbuf (when the mbuf is contiguous) or, otherwise, - * a pointer to temp_data after copying into it. - */ - pcap_dump((u_char *)dumper, &header, - rte_pktmbuf_read(mbuf, 0, caplen, temp_data)); - num_tx++; - tx_bytes += caplen; + data = rte_pktmbuf_read(mbuf, 0, caplen, temp_data); + if (likely(data != NULL)) { + pcap_dump((u_char *)dumper, &header, data); + num_tx++; + tx_bytes += caplen; + } } rte_pktmbuf_free_bulk(bufs, nb_pkts);
@@ -458,7 +457,7 @@ eth_tx_drop(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) tx_queue->tx_stat.pkts += nb_pkts; tx_queue->tx_stat.bytes += tx_bytes; - return i; + return nb_pkts; } /*
@@ -468,15 +467,12 @@ static uint16_t eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) { unsigned int i; - int ret; - struct rte_mbuf *mbuf; struct pmd_process_private *pp; struct pcap_tx_queue *tx_queue = queue; uint16_t num_tx = 0; uint32_t tx_bytes = 0; pcap_t *pcap; unsigned char *temp_data; - size_t len; pp = rte_eth_devices[tx_queue->port_id].process_private; pcap = pp->tx_pcap[tx_queue->queue_id];
@@ -486,19 +482,27 @@ eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) return 0; for (i = 0; i < nb_pkts; i++) { - mbuf = bufs[i]; - len = rte_pktmbuf_pkt_len(mbuf); + struct rte_mbuf *mbuf = bufs[i]; + uint32_t len = rte_pktmbuf_pkt_len(mbuf); + const uint8_t *data; - /* rte_pktmbuf_read() returns a pointer to the data directly - * in the mbuf (when the mbuf is contiguous) or, otherwise, - * a pointer to temp_data after copying into it. - */ - ret = pcap_sendpacket(pcap, - rte_pktmbuf_read(mbuf, 0, len, temp_data), len); - if (unlikely(ret != 0)) - break; - num_tx++; - tx_bytes += len; + if (unlikely(!rte_pktmbuf_is_contiguous(mbuf) && len > RTE_ETH_PCAP_SNAPSHOT_LEN)) { + static int warned; + + if (!warned) { + PMD_LOG(ERR, + "Multi segment PCAP packet. Size (%u) > max size (%u).", + len, RTE_ETH_PCAP_SNAPSHOT_LEN); + warned = 1; + } + continue; + } + + data = rte_pktmbuf_read(mbuf, 0, len, temp_data); + if (likely(data != NULL && pcap_sendpacket(pcap, data, len) == 0)) { + num_tx++; + tx_bytes += len; + } } rte_pktmbuf_free_bulk(bufs, nb_pkts);
@@ -507,7 +511,7 @@ eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) tx_queue->tx_stat.bytes += tx_bytes; tx_queue->tx_stat.err_pkts += i - num_tx; - return i; + return nb_pkts; } /*
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2.51.0