e1000 supports multi-buffer packets larger than rxbuf_size. This fixes the following (on linux): - in guest: ifconfig eth1 mtu 16110 - in host: ifconfig tap0 mtu 16110 ping -s 16082 <guest-ip>
Red Hat bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=602205 Signed-off-by: Michael S. Tsirkin <m...@redhat.com> --- hw/e1000.c | 25 ++++++++++++++++++++----- 1 files changed, 20 insertions(+), 5 deletions(-) diff --git a/hw/e1000.c b/hw/e1000.c index af101bd..2c133ab 100644 --- a/hw/e1000.c +++ b/hw/e1000.c @@ -642,6 +642,8 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) uint16_t vlan_special = 0; uint8_t vlan_status = 0, vlan_offset = 0; uint8_t min_buf[MIN_BUF_SIZE]; + size_t desc_offset; + size_t desc_size; if (!(s->mac_reg[RCTL] & E1000_RCTL_EN)) return -1; @@ -654,7 +656,7 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) size = sizeof(min_buf); } - if (size > s->rxbuf_size) { + if (0 && size > s->rxbuf_size) { DBGOUT(RX, "packet too large for buffers (%lu > %d)\n", (unsigned long)size, s->rxbuf_size); return -1; @@ -672,8 +674,15 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) } rdh_start = s->mac_reg[RDH]; + desc_offset = 0; do { + desc_size = size - desc_offset; + if (desc_size > s->rxbuf_size) { + desc_size = s->rxbuf_size; + } if (s->mac_reg[RDH] == s->mac_reg[RDT] && s->check_rxov) { + /* Discard all data written so far */ + s->mac_reg[RDH] = rdh_start; set_ics(s, 0, E1000_ICS_RXO); return -1; } @@ -684,9 +693,15 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) desc.status |= (vlan_status | E1000_RXD_STAT_DD); if (desc.buffer_addr) { cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr), - (void *)(buf + vlan_offset), size); - desc.length = cpu_to_le16(size + fcs_len(s)); - desc.status |= E1000_RXD_STAT_EOP|E1000_RXD_STAT_IXSM; + (void *)(buf + desc_offset + vlan_offset), + desc_size); + desc_offset += desc_size; + if (desc_offset >= size) { + desc.length = cpu_to_le16(desc_size + fcs_len(s)); + desc.status |= E1000_RXD_STAT_EOP | E1000_RXD_STAT_IXSM; + } else { + desc.length = cpu_to_le16(desc_size); + } } else { // as per intel docs; skip descriptors with null buf addr DBGOUT(RX, "Null RX descriptor!!\n"); } @@ -702,7 +717,7 @@ e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size) set_ics(s, 0, E1000_ICS_RXO); return -1; } - } while (desc.buffer_addr == 0); + } while (desc_offset < size); s->mac_reg[GPRC]++; s->mac_reg[TPR]++; -- 1.7.3.2.91.g446ac