diff options
author | jhb <jhb@FreeBSD.org> | 2008-01-17 23:37:47 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2008-01-17 23:37:47 +0000 |
commit | 4d2d2276c89d16d6686c32b709d17b5333f0c812 (patch) | |
tree | 6bf70a921cd833c0f3c1adc253928f44cb04943f /sys/dev/gem/if_gem.c | |
parent | 7e32513a5bd95aa6c5a6cf09ad0df8902f8b826f (diff) | |
download | FreeBSD-src-4d2d2276c89d16d6686c32b709d17b5333f0c812.zip FreeBSD-src-4d2d2276c89d16d6686c32b709d17b5333f0c812.tar.gz |
- Retire npe_defrag(), gem_defrag(), msk_defrag(), nfe_defrag(), and
re_defrag() and use m_collapse() instead.
- Replace a reference to ath_defrag() in a comment in if_wpi.c with
m_collapse().
Diffstat (limited to 'sys/dev/gem/if_gem.c')
-rw-r--r-- | sys/dev/gem/if_gem.c | 89 |
1 files changed, 1 insertions, 88 deletions
diff --git a/sys/dev/gem/if_gem.c b/sys/dev/gem/if_gem.c index f929151..ee50e96 100644 --- a/sys/dev/gem/if_gem.c +++ b/sys/dev/gem/if_gem.c @@ -100,7 +100,6 @@ static int gem_bitwait(struct gem_softc *sc, bus_addr_t r, uint32_t clr, uint32_t set); static void gem_cddma_callback(void *xsc, bus_dma_segment_t *segs, int nsegs, int error); -static struct mbuf *gem_defrag(struct mbuf *m0, int how, int maxfrags); static int gem_disable_rx(struct gem_softc *sc); static int gem_disable_tx(struct gem_softc *sc); static void gem_eint(struct gem_softc *sc, u_int status); @@ -1057,92 +1056,6 @@ gem_init_locked(struct gem_softc *sc) callout_reset(&sc->sc_tick_ch, hz, gem_tick, sc); } -/* - * This is a copy of ath_defrag(ath(4)). - * - * Defragment an mbuf chain, returning at most maxfrags separate - * mbufs+clusters. If this is not possible NULL is returned and - * the original mbuf chain is left in it's present (potentially - * modified) state. We use two techniques: collapsing consecutive - * mbufs and replacing consecutive mbufs by a cluster. - */ -static struct mbuf * -gem_defrag(struct mbuf *m0, int how, int maxfrags) -{ - struct mbuf *m, *n, *n2, **prev; - u_int curfrags; - - /* - * Calculate the current number of frags. - */ - curfrags = 0; - for (m = m0; m != NULL; m = m->m_next) - curfrags++; - /* - * First, try to collapse mbufs. Note that we always collapse - * towards the front so we don't need to deal with moving the - * pkthdr. This may be suboptimal if the first mbuf has much - * less data than the following. - */ - m = m0; - again: - for (;;) { - n = m->m_next; - if (n == NULL) - break; - if ((m->m_flags & M_RDONLY) == 0 && - n->m_len < M_TRAILINGSPACE(m)) { - bcopy(mtod(n, void *), mtod(m, char *) + m->m_len, - n->m_len); - m->m_len += n->m_len; - m->m_next = n->m_next; - m_free(n); - if (--curfrags <= maxfrags) - return (m0); - } else - m = n; - } - KASSERT(maxfrags > 1, - ("maxfrags %u, but normal collapse failed", maxfrags)); - /* - * Collapse consecutive mbufs to a cluster. - */ - prev = &m0->m_next; /* NB: not the first mbuf. */ - while ((n = *prev) != NULL) { - if ((n2 = n->m_next) != NULL && - n->m_len + n2->m_len < MCLBYTES) { - m = m_getcl(how, MT_DATA, 0); - if (m == NULL) - goto bad; - bcopy(mtod(n, void *), mtod(m, void *), n->m_len); - bcopy(mtod(n2, void *), mtod(m, char *) + n->m_len, - n2->m_len); - m->m_len = n->m_len + n2->m_len; - m->m_next = n2->m_next; - *prev = m; - m_free(n); - m_free(n2); - if (--curfrags <= maxfrags) /* +1 cl -2 mbufs */ - return (m0); - /* - * Still not there, try the normal collapse - * again before we allocate another cluster. - */ - goto again; - } - prev = &n->m_next; - } - /* - * No place where we can collapse to a cluster; punt. - * This can occur if, for example, you request 2 frags - * but the packet requires that both be clusters (we - * never reallocate the first mbuf to avoid moving the - * packet header). - */ - bad: - return (NULL); -} - static int gem_load_txmbuf(struct gem_softc *sc, struct mbuf **m_head) { @@ -1160,7 +1073,7 @@ gem_load_txmbuf(struct gem_softc *sc, struct mbuf **m_head) error = bus_dmamap_load_mbuf_sg(sc->sc_tdmatag, txs->txs_dmamap, *m_head, txsegs, &nsegs, BUS_DMA_NOWAIT); if (error == EFBIG) { - m = gem_defrag(*m_head, M_DONTWAIT, GEM_NTXSEGS); + m = m_collapse(*m_head, M_DONTWAIT, GEM_NTXSEGS); if (m == NULL) { m_freem(*m_head); *m_head = NULL; |