In m_megapullup() instead of reserving some space at the end of packet,
m_align() it, reserving space to prepend data. Reviewed by: mav
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7525c48111
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=248416
@ -1753,17 +1753,13 @@ m_megapullup(struct mbuf *m, int len) {
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if (len > m->m_pkthdr.len)
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if (len > m->m_pkthdr.len)
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goto bad;
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goto bad;
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/* Do not reallocate packet if it is sequentional,
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if (m->m_next == NULL && M_WRITABLE(m))
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* writable and has some extra space for expansion.
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* XXX: Constant 100bytes is completely empirical. */
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#define RESERVE 100
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if (m->m_next == NULL && M_WRITABLE(m) && M_TRAILINGSPACE(m) >= RESERVE)
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return (m);
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return (m);
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mcl = m_get2(len + RESERVE, M_NOWAIT, MT_DATA, M_PKTHDR);
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mcl = m_get2(len, M_NOWAIT, MT_DATA, M_PKTHDR);
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if (mcl == NULL)
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if (mcl == NULL)
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goto bad;
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goto bad;
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m_align(mcl, len);
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m_move_pkthdr(mcl, m);
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m_move_pkthdr(mcl, m);
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m_copydata(m, 0, len, mtod(mcl, caddr_t));
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m_copydata(m, 0, len, mtod(mcl, caddr_t));
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mcl->m_len = mcl->m_pkthdr.len = len;
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mcl->m_len = mcl->m_pkthdr.len = len;
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