linux-toradex.git/drivers/net/xen-netback/interface.c, branch v4.9.132

xen-netback: vif counters from int/long to u64

2017-12-09T21:01:55+00:00

[ Upstream commit ebf692f85ff78092cd238166d8d7ec51419f9c02 ]

This patch fixes an issue where the type of counters in the queue(s)
and interface are not in sync (queue counters are int, interface
counters are long), causing incorrect reporting of tx/rx values
of the vif interface and unclear counter overflows.
This patch sets both counters to the u64 type.

Signed-off-by: Mart van Santen 
Reviewed-by: Paul Durrant 
Signed-off-by: David S. Miller 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

xen-netback: correctly schedule rate-limited queues

2017-08-11T15:49:34+00:00

[ Upstream commit dfa523ae9f2542bee4cddaea37b3be3e157f6e6b ]

Add a flag to indicate if a queue is rate-limited. Test the flag in
NAPI poll handler and avoid rescheduling the queue if true, otherwise
we risk locking up the host. The rescheduling will be done in the
timer callback function.

Reported-by: Jean-Louis Dupond 
Signed-off-by: Wei Liu 
Tested-by: Jean-Louis Dupond 
Reviewed-by: Paul Durrant 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

xen-netback: protect resource cleaning on XenBus disconnect

2017-07-05T12:40:21+00:00

[ Upstream commit f16f1df65f1cf139ff9e9f84661e6573d6bb27fc ]

vif->lock is used to protect statistics gathering agents from using the
queue structure during cleaning.

Signed-off-by: Igor Druzhinin 
Acked-by: Wei Liu 
Reviewed-by: Paul Durrant 
Signed-off-by: David S. Miller 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

xen-netback: make sure that hashes are not send to unaware frontends

2016-10-08T03:52:33+00:00

In the case when a frontend only negotiates a single queue with xen-
netback it is possible for a skbuff with a s/w hash to result in a
hash extra_info segment being sent to the frontend even when no hash
algorithm has been configured. (The ndo_select_queue() entry point makes
sure the hash is not set if no algorithm is configured, but this entry
point is not called when there is only a single queue). This can result
in a frontend that is unable to handle extra_info segments being given
such a segment, causing it to crash.

This patch fixes the problem by clearing the hash in ndo_start_xmit()
instead, which is clearly guaranteed to be called irrespective of the
number of queues.

Signed-off-by: Paul Durrant 
Cc: Wei Liu 
Acked-by: Wei Liu 
Signed-off-by: David S. Miller

xen/netback: add fraglist support for to-guest rx

2016-10-07T00:37:36+00:00

This allows full 64K skbuffs (with 1500 mtu ethernet, composed of 45
fragments) to be handled by netback for to-guest rx.

Signed-off-by: Ross Lagerwall 
[re-based]
Signed-off-by: Paul Durrant 
Reviewed-by: David Vrabel 
Signed-off-by: David S. Miller

xen-netback: retire guest rx side prefix GSO feature

2016-10-07T00:37:35+00:00

As far as I am aware only very old Windows network frontends make use of
this style of passing GSO packets from backend to frontend. These
frontends can easily be replaced by the freely available Xen Project
Windows PV network frontend, which uses the 'default' mechanism for
passing GSO packets, which is also used by all Linux frontends.

NOTE: Removal of this feature will not cause breakage in old Windows
      frontends. They simply will no longer receive GSO packets - the
      packets instead being fragmented in the backend.

Signed-off-by: Paul Durrant 
Reviewed-by: David Vrabel 
Signed-off-by: David S. Miller

xen-netback: switch to threaded irq for control ring

2016-09-22T12:26:24+00:00

Instead of open coding it use the threaded irq mechanism in
xen-netback.

Signed-off-by: Juergen Gross 
Acked-by: Wei Liu 
Signed-off-by: David S. Miller

xen-netback: only deinitialized hash if it was initialized

2016-05-20T21:41:18+00:00

A domain with a frontend that does not implement a control ring has been
seen to cause a crash during domain save. This was apparently because
the call to xenvif_deinit_hash() in xenvif_disconnect_ctrl() is made
regardless of whether a control ring was connected, and hence
xenvif_hash_init() was called.

This patch brings the call to xenvif_deinit_hash() in
xenvif_disconnect_ctrl() inside the if clause that checks whether the
control ring event channel was connected. This is sufficient to ensure
it is only called if xenvif_init_hash() was called previously.

Signed-off-by: Paul Durrant 
Reported-by: Boris Ostrovsky 
Tested-by: Boris Ostrovsky 
Cc: Wei Liu 
Acked-by: Wei Liu 
Signed-off-by: David S. Miller

xen-netback: pass hash value to the frontend

2016-05-16T17:35:56+00:00

My recent patch to include/xen/interface/io/netif.h defines a new extra
info type that can be used to pass hash values between backend and guest
frontend.

This patch adds code to xen-netback to pass hash values calculated for
guest receive-side packets (i.e. netback transmit side) to the frontend.

Signed-off-by: Paul Durrant 
Acked-by: Wei Liu 
Signed-off-by: David S. Miller

xen-netback: add control protocol implementation

2016-05-16T17:35:56+00:00

My recent patch to include/xen/interface/io/netif.h defines a new shared
ring (in addition to the rx and tx rings) for passing control messages
from a VM frontend driver to a backend driver.

A previous patch added the necessary boilerplate for mapping the control
ring from the frontend, should it be created. This patch adds
implementations for each of the defined protocol messages.

Signed-off-by: Paul Durrant 
Cc: Wei Liu 
Acked-by: Wei Liu 
Signed-off-by: David S. Miller