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To obey the traditional practice in mbuf chaining.

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PR:		4020
Reviewed by:	hamada@astec.co.jp
This commit is contained in:
Jun-ichiro itojun Hagino 1997-10-01 05:54:58 +00:00
parent 34de7199ea
commit b51da36807
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=30022
1 changed files with 15 additions and 10 deletions
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25
sys/dev/vx/if_vx.c
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@ -850,6 +850,12 @@ vxget(sc, totlen)
*/
sh = splhigh();
/*
* Since we don't set allowLargePackets bit in MacControl register,
* we can assume that totlen <= 1500bytes.
* The while loop will be performed iff we have a packet with
* MLEN < m_len < MINCLSIZE.
*/
while (totlen > 0) {
if (top) {
m = sc->mb[sc->next_mb];
@ -867,18 +873,17 @@ vxget(sc, totlen)
len = MLEN;
}
if (totlen >= MINCLSIZE) {
MCLGET(m, M_DONTWAIT);
if (m->m_flags & M_EXT)
len = MCLBYTES;
MCLGET(m, M_DONTWAIT);
if (m->m_flags & M_EXT)
len = MCLBYTES;
}
len = min(totlen, len);
if (len > 3) {
len &= ~3;
insl(BASE + VX_W1_RX_PIO_RD_1, mtod(m, u_int32_t *),
len / 4);
} else
insb(BASE + VX_W1_RX_PIO_RD_1, mtod(m, u_int8_t *),
len);
if (len > 3)
insl(BASE + VX_W1_RX_PIO_RD_1, mtod(m, u_int32_t *), len / 4);
if (len & 3) {
insb(BASE + VX_W1_RX_PIO_RD_1, mtod(m, u_int8_t *) + (len & ~3),
len & 3);
}
m->m_len = len;
totlen -= len;
*mp = m;