[PULL 0/3] Net patches

[PULL 0/3] Net patches

[Jason Wang]

The following changes since commit d90f154867ec0ec22fd719164b88716e8fd48672:

  Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-6.1-20210504' into staging (2021-05-05 20:29:14 +0100)

are available in the git repository at:

  https://github.com/jasowang/qemu.git tags/net-pull-request

for you to fetch changes up to 7ec0d72cd519e569b6d1ef11be770beb67dd0824:

  tap-bsd: Remove special casing for older OpenBSD releases (2021-05-26 16:20:27 +0800)

----------------------------------------------------------------

----------------------------------------------------------------
Brad Smith (1):
      tap-bsd: Remove special casing for older OpenBSD releases

Guenter Roeck (1):
      hw/net/imx_fec: return 0xffff when accessing non-existing PHY

Laurent Vivier (1):
      virtio-net: failover: add missing remove_migration_state_change_notifier()

 hw/net/imx_fec.c    | 8 +++-----
 hw/net/trace-events | 2 ++
 hw/net/virtio-net.c | 1 +
 net/tap-bsd.c       | 8 --------
 4 files changed, 6 insertions(+), 13 deletions(-)

[PULL 1/3] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Jason Wang]

From: Guenter Roeck <linux@roeck-us.net>

If a PHY does not exist, attempts to read from it should return 0xffff.
Otherwise the Linux kernel will believe that a PHY is there and select
the non-existing PHY. This in turn will result in network errors later
on since the real PHY is not selected or configured.

Since reading from or writing to a non-existing PHY is not an emulation
error, replace guest error messages with traces.

Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daud茅 <f4bug@amsat.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/imx_fec.c    | 8 +++-----
 hw/net/trace-events | 2 ++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index f03450c..9c7035b 100644
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
     uint32_t phy = reg / 32;
 
     if (phy != s->phy_num) {
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
-                      TYPE_IMX_FEC, __func__, phy);
-        return 0;
+        trace_imx_phy_read_num(phy, s->phy_num);
+        return 0xffff;
     }
 
     reg %= 32;
@@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
     uint32_t phy = reg / 32;
 
     if (phy != s->phy_num) {
-        qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
-                      TYPE_IMX_FEC, __func__, phy);
+        trace_imx_phy_write_num(phy, s->phy_num);
         return;
     }
 
diff --git a/hw/net/trace-events b/hw/net/trace-events
index baf25ff..78e8566 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -414,7 +414,9 @@ i82596_channel_attention(void *s) "%p: Received CHANNEL ATTENTION"
 
 # imx_fec.c
 imx_phy_read(uint32_t val, int phy, int reg) "0x%04"PRIx32" <= phy[%d].reg[%d]"
+imx_phy_read_num(int phy, int configured) "read request from unconfigured phy %d (configured %d)"
 imx_phy_write(uint32_t val, int phy, int reg) "0x%04"PRIx32" => phy[%d].reg[%d]"
+imx_phy_write_num(int phy, int configured) "write request to unconfigured phy %d (configured %d)"
 imx_phy_update_link(const char *s) "%s"
 imx_phy_reset(void) ""
 imx_fec_read_bd(uint64_t addr, int flags, int len, int data) "tx_bd 0x%"PRIx64" flags 0x%04x len %d data 0x%08x"
-- 
2.7.4

[PULL 2/3] virtio-net: failover: add missing remove_migration_state_change_notifier()

[Jason Wang]

From: Laurent Vivier <lvivier@redhat.com>

In the failover case configuration, virtio_net_device_realize() uses an
add_migration_state_change_notifier() to add a state notifier, but this
notifier is not removed by the unrealize function when the virtio-net
card is unplugged.

If the card is unplugged and a migration is started, the notifier is
called and as it is not valid anymore QEMU crashes.

This patch fixes the problem by adding the
remove_migration_state_change_notifier() in virtio_net_device_unrealize().

The problem can be reproduced with:

  $ qemu-system-x86_64 -enable-kvm -m 1g -M q35 \
    -device pcie-root-port,slot=4,id=root1 \
    -device pcie-root-port,slot=5,id=root2 \
    -device virtio-net-pci,id=net1,mac=52:54:00:6f:55:cc,failover=on,bus=root1 \
    -monitor stdio disk.qcow2
  (qemu) device_del net1
  (qemu) migrate "exec:gzip -c > STATEFILE.gz"

  Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
  0x0000000000000000 in ?? ()
  (gdb) bt
  #0  0x0000000000000000 in  ()
  #1  0x0000555555d726d7 in notifier_list_notify (...)
      at .../util/notify.c:39
  #2  0x0000555555842c1a in migrate_fd_connect (...)
      at .../migration/migration.c:3975
  #3  0x0000555555950f7d in migration_channel_connect (...)
      error@entry=0x0) at .../migration/channel.c:107
  #4  0x0000555555910922 in exec_start_outgoing_migration (...)
      at .../migration/exec.c:42

Reported-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 66b9ff4..914051f 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3373,6 +3373,7 @@ static void virtio_net_device_unrealize(DeviceState *dev)
 
     if (n->failover) {
         device_listener_unregister(&n->primary_listener);
+        remove_migration_state_change_notifier(&n->migration_state);
     }
 
     max_queues = n->multiqueue ? n->max_queues : 1;
-- 
2.7.4

[PULL 3/3] tap-bsd: Remove special casing for older OpenBSD releases

[Jason Wang]

From: Brad Smith <brad@comstyle.com>

OpenBSD added support for tap(4) 10 releases ago.

Remove the special casing for older releases.

Signed-off-by: Brad Smith <brad@comstyle.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/tap-bsd.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index 77aaf67..59dfcdf 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -35,10 +35,6 @@
 #include <net/if_tap.h>
 #endif
 
-#if defined(__OpenBSD__)
-#include <sys/param.h>
-#endif
-
 #ifndef __FreeBSD__
 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
              int vnet_hdr_required, int mq_required, Error **errp)
@@ -59,11 +55,7 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
         if (*ifname) {
             snprintf(dname, sizeof dname, "/dev/%s", ifname);
         } else {
-#if defined(__OpenBSD__) && OpenBSD < 201605
-            snprintf(dname, sizeof dname, "/dev/tun%d", i);
-#else
             snprintf(dname, sizeof dname, "/dev/tap%d", i);
-#endif
         }
         TFR(fd = open(dname, O_RDWR));
         if (fd >= 0) {
-- 
2.7.4

Re: [PULL 1/3] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Philippe Mathieu-Daudé]

On 5/26/21 10:24 AM, Jason Wang wrote:
> From: Guenter Roeck <linux@roeck-us.net>
> 
> If a PHY does not exist, attempts to read from it should return 0xffff.
> Otherwise the Linux kernel will believe that a PHY is there and select
> the non-existing PHY. This in turn will result in network errors later
> on since the real PHY is not selected or configured.
> 
> Since reading from or writing to a non-existing PHY is not an emulation
> error, replace guest error messages with traces.
> 
> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
> Tested-by: Bin Meng <bmeng.cn@gmail.com>
> Reviewed-by: Philippe Mathieu-Daud茅 <f4bug@amsat.org>

Mojibake :/

> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  hw/net/imx_fec.c    | 8 +++-----
>  hw/net/trace-events | 2 ++
>  2 files changed, 5 insertions(+), 5 deletions(-)

Re: [PULL 0/3] Net patches

[Philippe Mathieu-Daudé]

On 5/26/21 10:24 AM, Jason Wang wrote:
> The following changes since commit d90f154867ec0ec22fd719164b88716e8fd48672:
> 
>   Merge remote-tracking branch 'remotes/dg-gitlab/tags/ppc-for-6.1-20210504' into staging (2021-05-05 20:29:14 +0100)
> 
> are available in the git repository at:
> 
>   https://github.com/jasowang/qemu.git tags/net-pull-request
> 
> for you to fetch changes up to 7ec0d72cd519e569b6d1ef11be770beb67dd0824:
> 
>   tap-bsd: Remove special casing for older OpenBSD releases (2021-05-26 16:20:27 +0800)
> 
> ----------------------------------------------------------------
> 
> ----------------------------------------------------------------
> Brad Smith (1):
>       tap-bsd: Remove special casing for older OpenBSD releases
> 
> Guenter Roeck (1):
>       hw/net/imx_fec: return 0xffff when accessing non-existing PHY
> 
> Laurent Vivier (1):
>       virtio-net: failover: add missing remove_migration_state_change_notifier()
> 
>  hw/net/imx_fec.c    | 8 +++-----
>  hw/net/trace-events | 2 ++
>  hw/net/virtio-net.c | 1 +
>  net/tap-bsd.c       | 8 --------
>  4 files changed, 6 insertions(+), 13 deletions(-)

UTF-8 mojibake in patch 1.

Re: [PULL 1/3] hw/net/imx_fec: return 0xffff when accessing non-existing PHY

[Jason Wang]

在 2021/5/26 下午5:08, Philippe Mathieu-Daudé 写道:
> On 5/26/21 10:24 AM, Jason Wang wrote:
>> From: Guenter Roeck <linux@roeck-us.net>
>>
>> If a PHY does not exist, attempts to read from it should return 0xffff.
>> Otherwise the Linux kernel will believe that a PHY is there and select
>> the non-existing PHY. This in turn will result in network errors later
>> on since the real PHY is not selected or configured.
>>
>> Since reading from or writing to a non-existing PHY is not an emulation
>> error, replace guest error messages with traces.
>>
>> Fixes: 461c51ad4275 ("Add a phy-num property to the i.MX FEC emulator")
>> Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
>> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
>> Tested-by: Bin Meng <bmeng.cn@gmail.com>
>> Reviewed-by: Philippe Mathieu-Daud茅 <f4bug@amsat.org>
> Mojibake :/


My bad, v2 sent.

Thanks


>
>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   hw/net/imx_fec.c    | 8 +++-----
>>   hw/net/trace-events | 2 ++
>>   2 files changed, 5 insertions(+), 5 deletions(-)