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>
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@ -61,6 +61,8 @@ static int debugflags = DBGBIT(TXERR) | DBGBIT(GENERAL);
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/* this is the size past which hardware will drop packets when setting LPE=0 */
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/* this is the size past which hardware will drop packets when setting LPE=0 */
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#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
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#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
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/* this is the size past which hardware will drop packets when setting LPE=1 */
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#define MAXIMUM_ETHERNET_LPE_SIZE 16384
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/*
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/*
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* HW models:
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* HW models:
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@ -809,8 +811,9 @@ e1000_receive(NetClientState *nc, const uint8_t *buf, size_t size)
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}
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}
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/* Discard oversized packets if !LPE and !SBP. */
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/* Discard oversized packets if !LPE and !SBP. */
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if (size > MAXIMUM_ETHERNET_VLAN_SIZE
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if ((size > MAXIMUM_ETHERNET_LPE_SIZE ||
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&& !(s->mac_reg[RCTL] & E1000_RCTL_LPE)
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(size > MAXIMUM_ETHERNET_VLAN_SIZE
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&& !(s->mac_reg[RCTL] & E1000_RCTL_LPE)))
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&& !(s->mac_reg[RCTL] & E1000_RCTL_SBP)) {
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&& !(s->mac_reg[RCTL] & E1000_RCTL_SBP)) {
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return size;
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return size;
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}
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}
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