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Tweak comments.

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This commit is contained in:
imp 2009-03-25 22:21:53 +00:00
parent 9e4f84bd6d
commit 43475c65b2
1 changed files with 16 additions and 15 deletions
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31
sys/dev/ed/if_ed.c
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@ -806,14 +806,15 @@ ed_rint(struct ed_softc *sc)
/*
* Length is a wild value. There's a good chance that
* this was caused by the NIC being old and buggy.
* The bug is that the length low byte is duplicated in
* the high byte. Try to recalculate the length based on
* the pointer to the next packet.
* The bug is that the length low byte is duplicated
* in the high byte. Try to recalculate the length
* based on the pointer to the next packet. Also,
* need ot preserve offset into page.
*
* NOTE: sc->next_packet is pointing at the current
* packet.
*/
/*
* NOTE: sc->next_packet is pointing at the current packet.
*/
len &= ED_PAGE_SIZE - 1; /* preserve offset into page */
len &= ED_PAGE_SIZE - 1;
if (packet_hdr.next_packet >= sc->next_packet)
len += (packet_hdr.next_packet -
sc->next_packet) * ED_PAGE_SIZE;
@ -834,14 +835,14 @@ ed_rint(struct ed_softc *sc)
}
/*
* Be fairly liberal about what we allow as a "reasonable" length
* so that a [crufty] packet will make it to BPF (and can thus
* be analyzed). Note that all that is really important is that
* we have a length that will fit into one mbuf cluster or less;
* the upper layer protocols can then figure out the length from
* their own length field(s).
* But make sure that we have at least a full ethernet header
* or we would be unable to call ether_input() later.
* Be fairly liberal about what we allow as a "reasonable"
* length so that a [crufty] packet will make it to BPF (and
* can thus be analyzed). Note that all that is really
* important is that we have a length that will fit into one
* mbuf cluster or less; the upper layer protocols can then
* figure out the length from their own length field(s). But
* make sure that we have at least a full ethernet header or
* we would be unable to call ether_input() later.
*/
if ((len >= sizeof(struct ed_ring) + ETHER_HDR_LEN) &&
(len <= MCLBYTES) &&