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  1. 01 11月, 2016 1 次提交
    • A
      ldmvsw: tx queue stuck in stopped state after LDC reset · 8778b276
      由 Aaron Young 提交于 
      The following patch fixes an issue with the ldmvsw driver where
the network connection of a guest domain becomes non-functional after
the guest domain has panic'd and rebooted.

The root cause was determined to be from the following series of
events:

1. Guest domain panics - resulting in the guest no longer processing
   network packets (from ldmvsw driver)
2. The ldmvsw driver (in the control domain) eventually exerts flow
   control due to no more available tx drings and stops the tx queue
   for the guest domain
3. The LDC of the network connection for the guest is reset when
   the guest domain reboots after the panic.
4. The LDC reset event is received by the ldmvsw driver and the ldmvsw
   responds by clearing the tx queue for the guest.
5. ldmvsw waits indefinitely for a DATA ACK from the guest - which is
   the normal method to re-enable the tx queue. But the ACK never comes
   because the tx queue was cleared due to the LDC reset.

To fix this issue, in addition to clearing the tx queue, re-enable the
tx queue on a LDC reset. This prevents the ldmvsw from getting caught in
this deadlocked state of waiting for a DATA ACK which will never come.
Signed-off-by: NAaron Young <Aaron.Young@oracle.com>
Acked-by: NSowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      8778b276
  3. 18 10月, 2016 1 次提交
  5. 19 3月, 2016 3 次提交
    • A
      ldmvsw: Checkpatch sunvnet.c and sunvnet_common.c · dc153f85
      由 Aaron Young 提交于 
        Checkpatch updates for sunvnet.c and sunvnet_common.c.
Signed-off-by: NAaron Young <aaron.young@oracle.com>
Signed-off-by: NRashmi Narasimhan <rashmi.narasimhan@oracle.com>
Reviewed-by: NSowmini Varadhan <sowmini.varadhan@oracle.com>
Reviewed-by: NAlexandre Chartre <Alexandre.Chartre@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      dc153f85
    • A
      ldmvsw: Make sunvnet_common compatible with ldmvsw · 67d0719f
      由 Aaron Young 提交于 
        Modify sunvnet common code and data structures to be compatible
  with both sunvnet and ldmvsw drivers.

  Details:

  Sunvnet operates on "vnet-port" nodes which appear in the Machine
  Description (MD) in a guest domain. Ldmvsw operates on "vsw-port"
  nodes which appear in the MD of a service domain.

  A difference between the sunvnet driver and the ldmvsw driver is
  the sunvnet driver creates a network interface (i.e. a struct net_device)
  for every vnet-port *parent* "network" node. Several vnet-ports may appear
  under this common parent network node - each corresponding to a common parent
  network interface.  Conversely, since bridge/vswitch software will need
  to interface with every vsw-port in a system, the ldmvsw driver creates
  a network interface (i.e. a struct net_device) for every vsw-port - not
  every parent node as with sunvnet.  This difference required some special
  handling in the common code as explained below.

  There are 2 key data structures used by the sunvnet and ldmvsw drivers
  (which are now found in sunvnet_common.h):

  1. struct vnet_port
     This structure represents a vnet-port node in sunvnet and a vsw-port
     in the ldmvsw driver.

  2. struct vnet
     This structure represents a parent "network" node in sunvnet and a parent
     "virtual-network-switch" node in ldmvsw.

  Since the sunvnet driver allocates a net_device for every parent "network"
  node, a net_device member appears in the struct vnet. Since the ldmvsw
  driver allocates a net_device for every port, a net_device member was
  added to the vnet_port. The common code distinguishes which structure
  net_device member to use by checking a 'vsw' bit that was added to the
  vnet_port structure. See the VNET_PORT_TO_NET_DEVICE() marco in
  sunvnet_common.h.

  The netdev_priv() in sunvnet is allocated as a vnet. The netdev_priv()
  in ldmvsw is a vnet_port. Therefore, any place in the common code
  where a netdev_priv() call was made, a wrapper function was implemented
  in each driver to first get the vnet and/or vnet_port (in a driver
  specific way) and pass them as newly added parameters to the common
  functions (see wrapper funcs: vnet_set_rx_mode() and vnet_poll_controller()).
  Since these wrapper functions call __tx_port_find(), __tx_port_find() was
  moved from the common code back into sunvnet.c. Note - ldmvsw.c does not
  require this function.

  These changes also required that port_is_up() be made
  into a common function and thus it was given a _common suffix and
  exported like the other common functions.

  A wrapper function was also added for vnet_start_xmit_common() to pass a
  driver-specific function arg to return the port associated with a given
  struct sk_buff and struct net_device. This was required because
  vnet_start_xmit_common() grabs a lock prior to getting the associated
  port. Using a function pointer arg allowed the code to work unchanged
  without risking changes to the non-trivial locking logic in
  vnet_start_xmit_common().
Signed-off-by: NAaron Young <aaron.young@oracle.com>
Signed-off-by: NRashmi Narasimhan <rashmi.narasimhan@oracle.com>
Reviewed-by: NSowmini Varadhan <sowmini.varadhan@oracle.com>
Reviewed-by: NAlexandre Chartre <Alexandre.Chartre@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      67d0719f
    • A
      ldmvsw: Split sunvnet driver into common code · 31762eaa
      由 Aaron Young 提交于 
        Split sunvnet.c into sunvnet.c and sunvnet_common.c.

  Details:

  Since the sunvnet and ldmvsw drivers will both use common sunvnet code,
  move the functions (and support functions) anticipated to be common code
  from sunvnet.c to sunvnet_common.c. Similarly, sunvnet.h was renamed to
  sunvnet_common.h. The sunvnet_common.c code will be compiled into the
  kernel and act as a library of functions that are linked by either
  (or both) drivers when loaded.

  Function names for external functions in sunvnet_common.c (to be
  called by both the sunvnet and ldmvsw drivers) were tagged with a "_common"
  suffix to clearly designate them as common functions.

  No functional changes as of yet... just moved code verbatim to the new
  sunvnet_common.c/h files.

  Makefile/Kconfig support added to build sunvnet_common.c file. The code
  is included in the kernel if SUN_LDOMS is defined/selected.

  NOTE - per the SubmittingPatches documentation, since the code was just
  moved from one file another, the code was NOT checkpatch'd in this commit
  to aid in review.
Signed-off-by: NAaron Young <aaron.young@oracle.com>
Signed-off-by: NRashmi Narasimhan <rashmi.narasimhan@oracle.com>
Reviewed-by: NSowmini Varadhan <sowmini.varadhan@oracle.com>
Reviewed-by: NAlexandre Chartre <Alexandre.Chartre@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      31762eaa
  7. 08 2月, 2016 1 次提交
  9. 20 1月, 2016 1 次提交
  11. 22 9月, 2015 1 次提交
  13. 09 4月, 2015 1 次提交
  15. 21 2月, 2015 1 次提交
  17. 12 2月, 2015 1 次提交
  19. 03 2月, 2015 1 次提交
  21. 27 1月, 2015 2 次提交
  23. 14 1月, 2015 1 次提交
  25. 20 12月, 2014 1 次提交
  27. 12 12月, 2014 1 次提交
  29. 09 12月, 2014 7 次提交
  31. 13 11月, 2014 1 次提交
  33. 11 11月, 2014 3 次提交
  35. 07 11月, 2014 2 次提交
  37. 31 10月, 2014 2 次提交
  39. 26 10月, 2014 3 次提交
  41. 02 10月, 2014 1 次提交
  43. 01 10月, 2014 4 次提交
    • D
      vio: fix reuse of vio_dring slot · d0aedcd4
      由 Dwight Engen 提交于 
      vio_dring_avail() will allow use of every dring entry, but when the last
entry is allocated then dr->prod == dr->cons which is indistinguishable from
the ring empty condition. This causes the next allocation to reuse an entry.
When this happens in sunvdc, the server side vds driver begins nack'ing the
messages and ends up resetting the ldc channel. This problem does not effect
sunvnet since it checks for < 2.

The fix here is to just never allocate the very last dring slot so that full
and empty are not the same condition. The request start path was changed to
check for the ring being full a bit earlier, and to stop the blk_queue if
there is no space left. The blk_queue will be restarted once the ring is
only half full again. The number of ring entries was increased to 512 which
matches the sunvnet and Solaris vdc drivers, and greatly reduces the
frequency of hitting the ring full condition and the associated blk_queue
stop/starting. The checks in sunvent were adjusted to account for
vio_dring_avail() returning 1 less.

Orabug: 19441666
OraBZ: 14983
Signed-off-by: NDwight Engen <dwight.engen@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      d0aedcd4
    • D
      sunvnet: generate ICMP PTMUD messages for smaller port MTUs · a2b78e9b
      由 David L Stevens 提交于 
      This patch sends ICMP and ICMPv6 messages for Path MTU Discovery when a remote
port MTU is smaller than the device MTU. This allows mixing newer VIO protocol
devices that support MTU negotiation with older devices that do not on the
same vswitch. It also allows Linux-Linux LDOMs to use 64K-1 data packets even
though Solaris vswitch is limited to <16K MTU.
Signed-off-by: NDavid L Stevens <david.stevens@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      a2b78e9b
    • D
      sunvnet: allow admin to set sunvnet MTU · 42db672d
      由 David L Stevens 提交于 
      This patch allows an admin to set the MTU on a sunvnet device to arbitrary
values between the minimum (68) and maximum (65535) IPv4 packet sizes.
Signed-off-by: NDavid L Stevens <david.stevens@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      42db672d
    • D
      sunvnet: make transmit path zero-copy in the kernel · 8e845f4c
      由 David L Stevens 提交于 
      This patch removes pre-allocated transmit buffers and instead directly maps
pending packets on demand. This saves O(n^2) maximum-sized transmit buffers,
for n hosts on a vswitch, as well as a copy to those buffers.

Single-stream TCP throughput linux-solaris dropped ~5% for 1500-byte MTU,
but linux-linux at 1500-bytes increased ~20%.
Signed-off-by: NDavid L Stevens <david.stevens@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      8e845f4c