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qemu: e1000 fix TOR math

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Patch b0b900070c made
TOR valuer incorrect: the spec says it should always
include the CRC field.
No one seems to use this field, but better to stick to spec.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2010-09-02 17:47:43 +03:00
parent ba5e7f8216
commit a05e8a6e90
1 changed files with 8 additions and 3 deletions
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11
hw/e1000.c
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@ -345,7 +345,7 @@ is_vlan_txd(uint32_t txd_lower)
/* FCS aka Ethernet CRC-32. We don't get it from backends and can't
* fill it in, just pad descriptor length by 4 bytes unless guest
* told us to trip it off the packet. */
* told us to strip it off the packet. */
static inline int
fcs_len(E1000State *s)
{
@ -690,9 +690,14 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
s->mac_reg[GPRC]++;
s->mac_reg[TPR]++;
n = s->mac_reg[TORL];
if ((s->mac_reg[TORL] += size) < n)
/* TOR - Total Octets Received:
* This register includes bytes received in a packet from the <Destination
* Address> field through the <CRC> field, inclusively.
*/
n = s->mac_reg[TORL] + size + /* Always include FCS length. */ 4;
if (n < s->mac_reg[TORL])
s->mac_reg[TORH]++;
s->mac_reg[TORL] = n;
n = E1000_ICS_RXT0;
if ((rdt = s->mac_reg[RDT]) < s->mac_reg[RDH])