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e1000: Discard oversized packets based on SBP|LPE 

Discard packets longer than 16384 when !SBP to match the hardware behavior.

Signed-off-by: Michael Contreras <michael@inetric.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Michael Contreras 2012-12-05 13:31:30 -05:00 committed by Stefan Hajnoczi
parent 8e4a424b30
commit 2c0331f4f7
1 changed files with 5 additions and 2 deletions
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7
hw/e1000.c
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@ -61,6 +61,8 @@ static int debugflags = DBGBIT(TXERR) | DBGBIT(GENERAL);
/* this is the size past which hardware will drop packets when setting LPE=0 */
#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
/* this is the size past which hardware will drop packets when setting LPE=1 */
#define MAXIMUM_ETHERNET_LPE_SIZE 16384
/*
* HW models:
@ -809,8 +811,9 @@ e1000_receive(NetClientState *nc, const uint8_t *buf, size_t size)
}
/* Discard oversized packets if !LPE and !SBP. */
if (size > MAXIMUM_ETHERNET_VLAN_SIZE
&& !(s->mac_reg[RCTL] & E1000_RCTL_LPE)
if ((size > MAXIMUM_ETHERNET_LPE_SIZE ||
(size > MAXIMUM_ETHERNET_VLAN_SIZE
&& !(s->mac_reg[RCTL] & E1000_RCTL_LPE)))
&& !(s->mac_reg[RCTL] & E1000_RCTL_SBP)) {
return size;
}