rsu: add KASSERT to document maximum mbuf size in rsu_tx_start
PR: 254479 Reviewed by: markj Sponsored by: The FreeBSD Foundation
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@ -2897,6 +2897,7 @@ rsu_tx_start(struct rsu_softc *sc, struct ieee80211_node *ni,
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}
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xferlen = sizeof(*txd) + m0->m_pkthdr.len;
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KASSERT(xferlen <= RSU_TXBUFSZ, ("%s: invalid length", __func__));
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m_copydata(m0, 0, m0->m_pkthdr.len, (caddr_t)&txd[1]);
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data->buflen = xferlen;
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