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Do proper padding of runt packets using code copied from bge(4).

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Reviewed by:	gnn
This commit is contained in:
Tim Kientzle 2012-10-25 04:37:47 +00:00
parent ea4597d0ab
commit 5daf64fb7d
1 changed files with 51 additions and 2 deletions
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53
sys/arm/ti/cpsw/if_cpsw.c
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@ -581,8 +581,8 @@ cpsw_encap(struct cpsw_softc *sc, struct mbuf *m0)
bd.next = 0;
bd.bufptr = seg->ds_addr;
bd.bufoff = 0;
bd.buflen = (seg->ds_len < 64 ? 64 : seg->ds_len);
bd.pktlen = (seg->ds_len < 64 ? 64 : seg->ds_len);
bd.buflen = seg->ds_len;
bd.pktlen = seg->ds_len;
/* Set OWNERSHIP, SOP, EOP */
bd.flags = (7<<13);
@ -599,6 +599,49 @@ cpsw_encap(struct cpsw_softc *sc, struct mbuf *m0)
return (0);
}
/*
* Pad the packet to the minimum length for Ethernet.
* (CPSW hardware doesn't do this for us.)
*/
static int
cpsw_pad(struct mbuf *m)
{
int padlen = ETHER_MIN_LEN - m->m_pkthdr.len;
struct mbuf *last, *n;
if (padlen <= 0)
return (0);
/* If there's only the packet-header and we can pad there, use it. */
if (m->m_pkthdr.len == m->m_len && M_WRITABLE(m) &&
M_TRAILINGSPACE(m) >= padlen) {
last = m;
} else {
/*
* Walk packet chain to find last mbuf. We will either
* pad there, or append a new mbuf and pad it.
*/
for (last = m; last->m_next != NULL; last = last->m_next)
;
if (!(M_WRITABLE(last) && M_TRAILINGSPACE(last) >= padlen)) {
/* Allocate new empty mbuf, pad it. Compact later. */
MGET(n, M_DONTWAIT, MT_DATA);
if (n == NULL)
return (ENOBUFS);
n->m_len = 0;
last->m_next = n;
last = n;
}
}
/* Now zero the pad area. */
memset(mtod(last, caddr_t) + last->m_len, 0, padlen);
last->m_len += padlen;
m->m_pkthdr.len += padlen;
return (0);
}
static void
cpsw_start(struct ifnet *ifp)
{
@ -615,6 +658,7 @@ cpsw_start_locked(struct ifnet *ifp)
struct cpsw_softc *sc = ifp->if_softc;
struct mbuf *m0, *mtmp;
uint32_t queued = 0;
int error;
CPSW_TX_LOCK_ASSERT(sc);
@ -628,6 +672,11 @@ cpsw_start_locked(struct ifnet *ifp)
if (m0 == NULL)
break;
if ((error = cpsw_pad(m0))) {
m_freem(m0);
continue;
}
mtmp = m_defrag(m0, M_NOWAIT);
if (mtmp)
m0 = mtmp;