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Make qwx only allocate a new mbuf when a free Rx ring slot is available.

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Avoids pointless alloc and free when the ring is already full.
This commit is contained in:
stsp
2026-05-29 09:35:29 +00:00
parent 28069cabcf
commit 72c0126504
1 changed files with 8 additions and 8 deletions
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sys/dev/ic/qwx.c
+8 -8
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@@ -1,4 +1,4 @@
/* $OpenBSD: qwx.c,v 1.116 2026/05/29 09:32:06 stsp Exp $ */
/* $OpenBSD: qwx.c,v 1.117 2026/05/29 09:35:29 stsp Exp $ */
/*
* Copyright 2023 Stefan Sperling <stsp@openbsd.org>
@@ -15260,6 +15260,13 @@ qwx_dp_rxbufs_replenish(struct qwx_softc *sc, int mac_id,
while (num_remain > 0) {
const size_t size = DP_RX_BUFFER_SIZE;
idx = qwx_next_free_rxbuf_idx(rx_ring);
if (idx == -1)
break;
rx_data = &rx_ring->rx_data[idx];
KASSERT(rx_data->map);
m = m_gethdr(M_DONTWAIT, MT_DATA);
if (m == NULL)
goto fail_free_mbuf;
@@ -15272,13 +15279,6 @@ qwx_dp_rxbufs_replenish(struct qwx_softc *sc, int mac_id,
goto fail_free_mbuf;
m->m_len = m->m_pkthdr.len = size;
idx = qwx_next_free_rxbuf_idx(rx_ring);
if (idx == -1)
goto fail_free_mbuf;
rx_data = &rx_ring->rx_data[idx];
KASSERT(rx_data->map);
ret = bus_dmamap_load_mbuf(sc->sc_dmat, rx_data->map, m,
BUS_DMA_READ | BUS_DMA_NOWAIT);