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netmap: Try to count packet drops in emulated mode
Right now we have little visibility into packet drops within netmap. Start trying to make packet loss issues more visible by counting queue drops in the transmit path, and in the input path for interfaces running in emulated mode, where we place received packets in a bounded software queue that is processed by rxsync. Reviewed by: vmaffione MFC after: 1 week Sponsored by: Zenarmor Sponsored by: OPNsense Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D38064
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@ -4329,8 +4329,10 @@ netmap_transmit(struct ifnet *ifp, struct mbuf *m)
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mbq_unlock(q);
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done:
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if (m)
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if (m) {
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if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
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m_freem(m);
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}
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/* unconditionally wake up listeners */
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kring->nm_notify(kring, 0);
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/* this is normally netmap_notify(), but for nics
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@ -837,8 +837,10 @@ generic_rx_handler(struct ifnet *ifp, struct mbuf *m)
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* support RX scatter-gather. */
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nm_prlim(2, "Warning: driver pushed up big packet "
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"(size=%d)", (int)MBUF_LEN(m));
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if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
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m_freem(m);
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} else if (unlikely(mbq_len(&kring->rx_queue) > na->num_rx_desc)) {
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if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
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m_freem(m);
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} else {
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mbq_safe_enqueue(&kring->rx_queue, m);
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