Building with CONFIG_DEBUG_SECTION_MISMATCH enabled, the following
WARNING is occured:
LD drivers/net/built-in.o
WARNING: drivers/net/built-in.o(.text+0xcd4c): Section mismatch in
reference from the function gfar_probe() to the function
.init.text:gfar_init_addr_hash_table()
The function gfar_probe() references
the function __init gfar_init_addr_hash_table().
This is often because gfar_probe lacks a __init
annotation or the annotation of gfar_init_addr_hash_table is wrong.
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Wei Liu says:
====================
This is rebased version of Andrew's V8 patch series. The original cover letter:
--------------------
xen-net{back, front}: Multiple transmit and receive queues
This patch series implements multiple transmit and receive queues (i.e.
multiple shared rings) for the xen virtual network interfaces.
The series is split up as follows:
- Patch 1 brings the 'grant_copy_op' array back into struct xenvif, in
preparation for multi-queue support. See the patch itself for more details.
- Patches 2 and 4 factor out the queue-specific data for netback and
netfront respectively, and modify the rest of the code to use these
as appropriate.
- Patches 3 and 5 introduce new XenStore keys to negotiate and use
multiple shared rings and event channels, and code to connect these
as appropriate.
- Patch 6 documents the XenStore keys required for the new feature
in include/xen/interface/io/netif.h
All other transmit and receive processing remains unchanged, i.e. there
is a kthread per queue and a NAPI context per queue.
The performance of these patches has been analysed in detail, with
results available at:
http://wiki.xenproject.org/wiki/Xen-netback_and_xen-netfront_multi-queue_performance_testing
To summarise:
* Using multiple queues allows a VM to transmit at line rate on a 10
Gbit/s NIC, compared with a maximum aggregate throughput of 6 Gbit/s
with a single queue.
* For intra-host VM--VM traffic, eight queues provide 171% of the
throughput of a single queue; almost 12 Gbit/s instead of 6 Gbit/s.
* There is a corresponding increase in total CPU usage, i.e. this is a
scaling out over available resources, not an efficiency improvement.
* Results depend on the availability of sufficient CPUs, as well as the
distribution of interrupts and the distribution of TCP streams across
the queues.
Queue selection is currently achieved via an L4 hash on the packet (i.e.
TCP src/dst port, IP src/dst address) and is not negotiated between the
frontend and backend, since only one option exists. Future patches to
support other frontends (particularly Windows) will need to add some
capability to negotiate not only the hash algorithm selection, but also
allow the frontend to specify some parameters to this.
Note that queue selection is a decision by the transmitting system about
which queue to use for a particular packet. In general, the algorithm
may differ between the frontend and the backend with no adverse effects.
Queue-specific XenStore entries for ring references and event channels
are stored hierarchically, i.e. under .../queue-N/... where N varies
from 0 to one less than the requested number of queues (inclusive). If
only one queue is requested, it falls back to the flat structure where
the ring references and event channels are written at the same level as
other vif information.
V8:
- Squash the queue error handling code into patch 3.
- Update the documentation (patch 6) according to comments on the
equivalent patch to Xen.
V7:
- Rebase on latest net-next, which includes the netback grant mapping
patch series from Zoltan Kiss
- Reduce QUEUE_NAME_SIZE by 1 to avoid double-counting the trailing '\0'
- Simplify the queue hashing by using (hash % num_queues) instead of
multiply & shift.
- Add ratelimited warning for invalid queue selection.
- Fix error handling to correctly tear down already setup queues.
- Use dev->real_num_tx_queues instead of separately maintaining a
count of the number of queues.
V6:
- Use 'max_queues' as the module param. name for both netback and netfront.
V5:
- Fix bug in xenvif_free() that could lead to an attempt to transmit an
skb after the queue structures had been freed.
- Improve the XenStore protocol documentation in netif.h.
- Fix IRQ_NAME_SIZE double-accounting for null terminator.
- Move rx_gso_checksum_fixup stat into struct xenvif_stats (per-queue).
- Don't initialise a local variable that is set in both branches (xspath).
V4:
- Add MODULE_PARM_DESC() for the multi-queue parameters for netback
and netfront modules.
- Move del_timer_sync() in netfront to after unregister_netdev, which
restores the order in which these functions were called before applying
these patches.
V3:
- Further indentation and style fixups.
V2:
- Rebase onto net-next.
- Change queue->number to queue->id.
- Add atomic operations around the small number of stats variables that
are not queue-specific or per-cpu.
- Fixup formatting and style issues.
- XenStore protocol changes documented in netif.h.
- Default max. number of queues to num_online_cpus().
- Check requested number of queues does not exceed maximum.
--------------------
I rebased this on top of net-next. No functional change is introduced. The
patch that needed some extra care was "xen-netback: Factor queue-specific data
into queue struct" because it clashed with a fix introduced in net. A simple
test of creating guest, iperf, then shutting down guest worked as expected.
The last patch fixes a minor problem that queue name is not initialised in
xen-netfront, resulting in names like "-tx" "-rx" in /proc/interrupt.
Changes since v9 (no functional change introduced):
* include commit summary in the commit message of first patch
* fold David Vrabel's Reviewed-by into last patch
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Build on the refactoring of the previous patch to implement multiple
queues between xen-netfront and xen-netback.
Check XenStore for multi-queue support, and set up the rings and event
channels accordingly.
Write ring references and event channels to XenStore in a queue
hierarchy if appropriate, or flat when using only one queue.
Update the xennet_select_queue() function to choose the queue on which
to transmit a packet based on the skb hash result.
Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In preparation for multi-queue support in xen-netfront, move the
queue-specific data from struct netfront_info to struct netfront_queue,
and update the rest of the code to use this.
Also adds loops over queues where appropriate, even though only one is
configured at this point, and uses alloc_etherdev_mq() and the
corresponding multi-queue netif wake/start/stop functions in preparation
for multiple active queues.
Finally, implements a trivial queue selection function suitable for
ndo_select_queue, which simply returns 0, selecting the first (and
only) queue.
Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Builds on the refactoring of the previous patch to implement multiple
queues between xen-netfront and xen-netback.
Writes the maximum supported number of queues into XenStore, and reads
the values written by the frontend to determine how many queues to use.
Ring references and event channels are read from XenStore on a per-queue
basis and rings are connected accordingly.
Also adds code to handle the cleanup of any already initialised queues
if the initialisation of a subsequent queue fails.
Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In preparation for multi-queue support in xen-netback, move the
queue-specific data from struct xenvif into struct xenvif_queue, and
update the rest of the code to use this.
Also adds loops over queues where appropriate, even though only one is
configured at this point, and uses alloc_netdev_mq() and the
corresponding multi-queue netif wake/start/stop functions in preparation
for multiple active queues.
Finally, implements a trivial queue selection function suitable for
ndo_select_queue, which simply returns 0 for a single queue and uses
skb_get_hash() to compute the queue index otherwise.
Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This array was allocated separately in commit ac3d5ac2 ("xen-netback:
fix guest-receive-side array sizes") due to it being very large, and a
struct xenvif is allocated as the netdev_priv part of a struct
net_device, i.e. via kmalloc() but falling back to vmalloc() if the
initial alloc. fails.
In preparation for the multi-queue patches, where this array becomes
part of struct xenvif_queue and is always allocated through vzalloc(),
move this back into the struct xenvif.
Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jeff Kirsher says:
====================
Intel Wired LAN Driver Updates
This series contains updates to e1000, igb and ixgbe.
Emil provides his version 2 fix for the detection of SFP+ capable interfaces.
In cases where the driver is loaded while there are no SFP+ modules in cage,
the interface was not being detected as SFP capable. Resolve the issue by
identifying interfaces with no PHY type set as SFP capable which allows the
driver to detect the SFP module when the interface is brought up. In this
version 2 of the patch, the 82599 specific check was removed since we only
have 82598 devices that are SFP capable.
Jacob removes the including of the export header in the ixgbe PTP core, since
it is not needed. Renames igb_ptp_enable() to igb_ptp_feature_enable() to
better reflect the actual functions purpose.
Todd fixes the ethtool loopback test for i354 backplane devices since we
do not know what PHY is to be used for the devices, use MAC loopback for
ethtool tests. Todd also sets the packet buffer size register defaults for
i210 devices.
Yongjian Xu removes the check for skb->len being negative or zero since there
is never a case where it would be zero or negative for e1000.
Manuel Schölling updates e1000 to use the time_after() helper function.
v2: Fix indentation on wrapped line in patch 3 of the series based on
feedback from David Miller
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
To be future-proof and for better readability the time comparisons are modified
to use time_after() instead of plain, error-prone math.
Signed-off-by: Manuel Schölling <manuel.schoelling@gmx.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
In cases where the driver is loaded while there are no SFP+ modules in
the cage the interface was not being detected as SFP capable. To account
for this the driver called identify_sfp in ixgbe_get_settings to make
sure the data is correct. However when there is no SFP+ module in the cage
the driver waits for the I2C reads to time out which can take more than a
second and will cause issues with tools (like net-snmp) that may poll
for that information.
This patch resolves the issue by identifying interfaces with no PHY
type set as SFP capable which allows the driver to detect the SFP module
when the interface is brought up. As result of this we can also remove the
identify_sfp call from ixgbe_get_settings.
v2: remove the 82599 specific check since we have 82598 devices that are SFP
capable.
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Conflicts:
include/net/inetpeer.h
net/ipv6/output_core.c
Changes in net were fixing bugs in code removed in net-next.
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit 4a55530f38 (net: sh_eth: modify the definitions of register) managed
to leave out the E-DMAC register entries in sh_eth_offset_fast_sh3_sh2[], thus
totally breaking SH7619/771x support. Add the missing entries using the data
from before that commit.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The current behaviour of the sh_eth driver is not to use the RNC bit
for the receive ring. This means that every packet recieved is not only
generating an IRQ but it also stops the receive ring DMA as well until
the driver re-enables it after unloading the packet.
This means that a number of the following errors are generated due to
the receive packet FIFO overflowing due to nowhere to put packets:
net eth0: Receive FIFO Overflow
Since feedback from Yoshihiro Shimoda shows that every supported LSI
for this driver should have the bit enabled it seems the best way is
to remove the RMCR default value from the per-system data and just
write it when initialising the RMCR value. This is discussed in
the message (http://www.spinics.net/lists/netdev/msg284912.html).
I have tested the RMCR_RNC configuration with NFS root filesystem and
the driver has not failed yet. There are further test reports from
Sergei Shtylov and others for both the R8A7790 and R8A7791.
There is also feedback fron Cao Minh Hiep[1] which reports the
same issue in (http://comments.gmane.org/gmane.linux.network/316285)
showing this fixes issues with losing UDP datagrams under iperf.
Tested-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
When we jump to free_pcpu on failure in alloc_netdev_mqs()
rx and tx queues are not yet allocated, so no need to free them.
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
A rmb() is required to ensure that the CQE is not read before it
is written by the adapter DMA. PCI ordering rules will make sure
the other fields are written before the marker at the end of struct
eth_fast_path_rx_cqe but without rmb() a weakly ordered processor can
process stale data.
Without the barrier we have observed various crashes including
bnx2x_tpa_start being called on queues not stopped (resulting in message
start of bin not in stop) and NULL pointer exceptions from bnx2x_rx_int.
Signed-off-by: Milton Miller <miltonm@us.ibm.com>
Signed-off-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When injecting EEH error to bnx2x adapter, adapter couldn't be recovery
and caused recursive EEH errors. The patch fixes the issue.
Signed-off-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Antonio Ospite
Xiubo Li
David S. Miller
Wei Liu
Andrew J. Bennieston
Manuel Schölling
Yongjian Xu
Todd Fujinaka
Jacob Keller
Emil Tantilov
Sergei Shtylyov
Ben Dooks
WANG Cong
Cong Wang
wenxiong@linux.vnet.ibm.com