diff mbox series

[PULL,4/5] hw/net: e1000e: Correct the initial value of VET register

Message ID 20210802043344.44301-5-jasowang@redhat.com
State New
Headers show
Series [PULL,1/5] hw/net/vmxnet3: Do not abort QEMU if guest specified bad queue numbers | expand

Commit Message

Jason Wang Aug. 2, 2021, 4:33 a.m. UTC 
From: Christina Wang <christina.wang@windriver.com>

The initial value of VLAN Ether Type (VET) register is 0x8100, as per
the manual and real hardware.

While Linux e1000e driver always writes VET register to 0x8100, it is
not always the case for everyone. Drivers relying on the reset value
of VET won't be able to transmit and receive VLAN frames in QEMU.

Unlike e1000 in QEMU, e1000e uses a field 'vet' in "struct E1000Core"
to cache the value of VET register, but the cache only gets updated
when VET register is written. To always get a consistent VET value
no matter VET is written or remains its reset value, drop the 'vet'
field and use 'core->mac[VET]' directly.

Reported-by: Markus Carlstedt <markus.carlstedt@windriver.com>
Signed-off-by: Christina Wang <christina.wang@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/core/machine.c    | 1 +
 hw/net/e1000e.c      | 8 +++++++-
 hw/net/e1000e_core.c | 9 ++++-----
 3 files changed, 12 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/hw/core/machine.c b/hw/core/machine.c
index f98a797..943974d 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -42,6 +42,7 @@  GlobalProperty hw_compat_6_0[] = {
     { "i8042", "extended-state", "false"},
     { "nvme-ns", "eui64-default", "off"},
     { "e1000", "init-vet", "off" },
+    { "e1000e", "init-vet", "off" },
 };
 const size_t hw_compat_6_0_len = G_N_ELEMENTS(hw_compat_6_0);
 
diff --git a/hw/net/e1000e.c b/hw/net/e1000e.c
index a8a77ec..ac96f76 100644
--- a/hw/net/e1000e.c
+++ b/hw/net/e1000e.c
@@ -35,6 +35,7 @@ 
 
 #include "qemu/osdep.h"
 #include "qemu/units.h"
+#include "net/eth.h"
 #include "net/net.h"
 #include "net/tap.h"
 #include "qemu/module.h"
@@ -79,7 +80,7 @@  struct E1000EState {
     bool disable_vnet;
 
     E1000ECore core;
-
+    bool init_vet;
 };
 
 #define E1000E_MMIO_IDX     0
@@ -527,6 +528,10 @@  static void e1000e_qdev_reset(DeviceState *dev)
     trace_e1000e_cb_qdev_reset();
 
     e1000e_core_reset(&s->core);
+
+    if (s->init_vet) {
+        s->core.mac[VET] = ETH_P_VLAN;
+    }
 }
 
 static int e1000e_pre_save(void *opaque)
@@ -666,6 +671,7 @@  static Property e1000e_properties[] = {
                         e1000e_prop_subsys_ven, uint16_t),
     DEFINE_PROP_SIGNED("subsys", E1000EState, subsys, 0,
                         e1000e_prop_subsys, uint16_t),
+    DEFINE_PROP_BOOL("init-vet", E1000EState, init_vet, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
index b75f2ab..b4bf4ca 100644
--- a/hw/net/e1000e_core.c
+++ b/hw/net/e1000e_core.c
@@ -731,7 +731,7 @@  e1000e_process_tx_desc(E1000ECore *core,
             if (e1000x_vlan_enabled(core->mac) &&
                 e1000x_is_vlan_txd(txd_lower)) {
                 net_tx_pkt_setup_vlan_header_ex(tx->tx_pkt,
-                    le16_to_cpu(dp->upper.fields.special), core->vet);
+                    le16_to_cpu(dp->upper.fields.special), core->mac[VET]);
             }
             if (e1000e_tx_pkt_send(core, tx, queue_index)) {
                 e1000e_on_tx_done_update_stats(core, tx->tx_pkt);
@@ -1012,7 +1012,7 @@  e1000e_receive_filter(E1000ECore *core, const uint8_t *buf, int size)
 {
     uint32_t rctl = core->mac[RCTL];
 
-    if (e1000x_is_vlan_packet(buf, core->vet) &&
+    if (e1000x_is_vlan_packet(buf, core->mac[VET]) &&
         e1000x_vlan_rx_filter_enabled(core->mac)) {
         uint16_t vid = lduw_be_p(buf + 14);
         uint32_t vfta = ldl_le_p((uint32_t *)(core->mac + VFTA) +
@@ -1686,7 +1686,7 @@  e1000e_receive_iov(E1000ECore *core, const struct iovec *iov, int iovcnt)
     }
 
     net_rx_pkt_attach_iovec_ex(core->rx_pkt, iov, iovcnt, iov_ofs,
-                               e1000x_vlan_enabled(core->mac), core->vet);
+                               e1000x_vlan_enabled(core->mac), core->mac[VET]);
 
     e1000e_rss_parse_packet(core, core->rx_pkt, &rss_info);
     e1000e_rx_ring_init(core, &rxr, rss_info.queue);
@@ -2397,8 +2397,7 @@  static void
 e1000e_set_vet(E1000ECore *core, int index, uint32_t val)
 {
     core->mac[VET] = val & 0xffff;
-    core->vet = le16_to_cpu(core->mac[VET]);
-    trace_e1000e_vlan_vet(core->vet);
+    trace_e1000e_vlan_vet(core->mac[VET]);
 }
 
 static void