We get a static checker warning here on devel kernels:
drivers/net/hamradio/mkiss.c:560 ax_xmit()
warn: variable dereferenced before check 'skb' (see line 532)
It turns out that the NULL check can be deleted.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Or Gerlitz says:
====================
Add QCN support to the DCB NL layer
This series from Shani Michaeli adds support for the IEEE QCN attribute
to the kernel DCB NL stack, and implementation in the mlx4 driver which
programs the firmware according to the admin directives.
changes from V0:
- applied feedback from John and added his acked-by to patch #1
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Implement the IEEE DCB handlers for set/get QCN parameters and
statistics reading per TC.
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add device capability, firmware command opcode and etc prior elements
needed for QCN suppprt. Disable SRIOV VF view/access for QCN is disabled.
While here, remove a redundant offset definition into the
QUERY_DEV_CAP mailbox.
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
As specified in 802.1Qau spec. Add this optional attribute to the
DCB netlink layer. To allow for application to use the new attribute,
NIC drivers should implement and register the callbacks ieee_getqcn,
ieee_setqcn and ieee_getqcnstats.
The QCN attribute holds a set of parameters for management, and
a set of statistics to provide informative data on Congestion-Control
defined by this spec.
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Alexander Duyck says:
====================
The rest of the FIB patches (add key_vector to fib_table)
This patch series is the rest of what I had originally planned for this kernel
release. It adds a structure called key_vector which is embedded within
every tnode, leaf, and the trie root itself. By doing this we can navigate
from any point within the trie to any other point fairly quickly and
avoiding NULL pointer checks in the case of a backtrace. As a result we
can pipeline things a bit further since we don't have to worry about
dereferencing NULL in a backtrace. This can amount to significant savings
on a long backtrace.
I decided to drop the up-level code as that conflicts with combining the
main and local tries. I have one patch as an RFC that currently combines
the tries however it still needs some work as we have to split the local
and main tries in the event of custom rules being defined. As such we are
probably going to be doing some more hacking on fib_table_flush_external as
that will also need to flush the local entries from the main trie and place
them back in the local trie.
v2: Rebased on the switchdev FIB offload work
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
This change makes it so that the root of the trie contains a key_vector, by
doing this we make room to essentially collapse the entire trie by at least
one cache line as we can store the information about the tnode or leaf that
is pointed to in the root.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This change pulls the parent pointer from the key_vector and places it in
the tnode structure.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This pulls the information about the child array out of the key_vector and
places it in the tnode since that is where it is needed.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
RCU is only needed once for the entire node, not once per key_vector so we
can pull that out and move it to the tnode structure.
In addition add accessors to be used inside the RCU functions so that we
can more easily get from the key vector to either the tnode or the trie
pointers.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This change pulls the fields not explicitly needed in the key_vector and
placed them in the new tnode structure. By doing this we will eventually
be able to reduce the key_vector down to 16 bytes on 64 bit systems, and
12 bytes on 32 bit systems.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
We are now checking the length of a key_vector instead of a tnode so it
makes sense to probably just rename this to child_length since it would
probably even be applicable to a leaf.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
I am replacing the tnode_get_child call with get_child since we are
techically pulling the child out of a key_vector now and not a tnode.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rename the tnode to key_vector. The key_vector will be the eventual
container for all of the information needed by either a leaf or a tnode.
The final result should be much smaller than the 40 bytes currently needed
for either one.
This also updates the trie struct so that it contains an array of size 1 of
tnode pointers. This is to bring the structure more inline with how an
actual tnode itself is configured.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Resize related functions now all return a pointer to the pointer that
references the object that was resized.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This change just does a couple of minor cleanups on
fib_table_flush_external. Specifically it addresses the fact that resize
was being called even though nothing was being removed from the table, and
it drops an unecessary indent since we could just call continue on the
inverse of the fi && flag check.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
ZynqMP soc has single interrupt for all the queue events. So,
passing the IRQF_SHARED flag for interrupt registration call.
Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Include multi queue support for the ethernet IP version in xilinx ZynqMP
SoC.
Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
brcmfmac:
* sdio improvements
* add a debugfs file so users can provide us all the revinfo we could
ask for
iwlwifi:
* add triggers for firmware dump collection
* remove support for -9.ucode
* new statitics API
* rate control improvements
ath9k:
* add per-vif TX power capability
* BT coexistance fixes
ath10k:
* qca6174: enable STA transmit beamforming (TxBF) support
* disable multi-vif power save by default
bcma:
* enable support for PCIe Gen 2 host devices
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Merge tag 'wireless-drivers-next-for-davem-2015-03-06' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next
Major changes:
brcmfmac:
* sdio improvements
* add a debugfs file so users can provide us all the revinfo we could
ask for
iwlwifi:
* add triggers for firmware dump collection
* remove support for -9.ucode
* new statitics API
* rate control improvements
ath9k:
* add per-vif TX power capability
* BT coexistance fixes
ath10k:
* qca6174: enable STA transmit beamforming (TxBF) support
* disable multi-vif power save by default
bcma:
* enable support for PCIe Gen 2 host devices
Signed-off-by: David S. Miller <davem@davemloft.net>
When building without CONFIG_NET_SWITCHDEV,
netdev_switch_fib_ipv4_abort is defined in the header file. It must
be static inline to avoid build failure at link time.
Fixes: 8e05fd7166 ("fib: hook IPv4 fib for hardware offload")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
If the nla length is less than 2 then the nla data could be accessed
beyond the accessible bounds. So ensure that the nla is big enough to
at least read the via_family before doing so. Replace magic value of
2.
Fixes: 03c0566542 ("mpls: Basic support for adding and removing routes")
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Robert Shearman <rshearma@brocade.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Petri Gynther says:
====================
net: bcmgenet: preparation for multiple Rx queues
Three small patches in preparation for supporting multiple Rx queues:
1. set hw_params->rx_queues = 0
2. adjust the call to alloc_etherdev_mqs()
3. add GENET_Q16_RX_BD_CNT and hw_params->rx_bds_per_q
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
In preparation for supporting multiple Rx queues, add GENET_Q16_RX_BD_CNT
and hw_params->rx_bds_per_q.
Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In preparation for supporting multiple Rx queues, adjust the call to
alloc_etherdev_mqs() to allow max GENET_MAX_MQ_CNT + 1 Rx queues.
The actual number of Rx queues in use is correctly adjusted with:
netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);
Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
bcmgenet driver doesn't yet support multiple Rx queues.
Set hw_params->rx_queues = 0 accordingly.
The default Rx queue (Q16) is still created and operational.
Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jeff Kirsher says:
====================
Intel Wired LAN Driver Updates 2015-03-06
This series contains updates to e1000, e1000e and igb.
Yanir provides updates to e1000e based on the patches provided by John
Linville. First updates the code comment to better describe the changes
and the impact on the driver. Second removed calls to ioremap/unmap for
i219 since this is only relevant to older hardware only. Starting with
i219, the NVM will not be mapped to its one BAR but to a address region
in another bar.
Alex Duyck provides two fixes for igb, first fixes a compile warning
where a variable may be used uninitialized, so Alex initializes it.
Second fixes an issue where all of the pin register values were having
to be pushed onto the stack each time the function was called, so to
avoid this, Alex made them static const so that they should only need
to be allocated once and we can avoid all the instructions to get them
onto the stack.
Eliezer found an issue in e1000 where we needed to be calling
netif_carrier_off earlier in the down() to prevent the stack from
queuing more packets to the interface.
Sabrina Dubroca resolved a potential race condition by adding a
dummy allocator. There was a race condition between e1000_change_mtu()
cleanups and netpoll, when changing the MTU across jumbo sizes.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Fan Du says:
====================
Improvements for TCP PMTU
This patchset performs some improvements and enhancement
for current TCP PMTU as per RFC4821 with the aim to find
optimal mms size quickly, and also be adaptive to route
changes like enlarged path MTU. Then TCP PMTU could be
used to probe a effective pmtu in absence of ICMP message
for tunnels(e.g. vxlan) across different networking stack.
Patch1/4: Set probe mss base to 1024 Bytes per RFC4821
Patch2/4: Do not double probe_size for each probing,
use a simple binary search to gain maximum performance.
mss for next probing.
Patch3/4: Create a probe timer to detect enlarged path MTU.
Patch4/4: Update ip-sysctl.txt for new sysctl knobs.
Changelog:
v5:
- Zero probe_size before resetting search range.
- Update ip-sysctl.txt for new sysctl knobs.
v4:
- Convert probe_size to mss, not directly from search_low/high
- Clamp probe_threshold
- Don't adjust search_high in blackhole probe, so drop orignal patch3
v3:
- Update commit message for patch2
- Fix pseudo timer delta calculation in patch4
v2:
- Introduce sysctl_tcp_probe_threshold to control when
probing will stop, as suggested by John Heffner.
- Add patch3 to shrink current mss value for search low boundary.
- Drop cannonical timer usages, implements pseudo timer based on
32bits jiffies tcp_time_stamp, as suggested by Eric Dumazet.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Namely tcp_probe_interval to control how often to restart
a probe. And tcp_probe_threshold to control when stop the
probing in respect to the width of search range in bytes
Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
As per RFC4821 7.3. Selecting Probe Size, a probe timer should
be armed once probing has converged. Once this timer expired,
probing again to take advantage of any path PMTU change. The
recommended probing interval is 10 minutes per RFC1981. Probing
interval could be sysctled by sysctl_tcp_probe_interval.
Eric Dumazet suggested to implement pseudo timer based on 32bits
jiffies tcp_time_stamp instead of using classic timer for such
rare event.
Signed-off-by: Fan Du <fan.du@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Current probe_size is chosen by doubling mss_cache,
the probing process will end shortly with a sub-optimal
mss size, and the link mtu will not be taken full
advantage of, in return, this will make user to tweak
tcp_base_mss with care.
Use binary search to choose probe_size in a fine
granularity manner, an optimal mss will be found
to boost performance as its maxmium.
In addition, introduce a sysctl_tcp_probe_threshold
to control when probing will stop in respect to
the width of search range.
Test env:
Docker instance with vxlan encapuslation(82599EB)
iperf -c 10.0.0.24 -t 60
before this patch:
1.26 Gbits/sec
After this patch: increase 26%
1.59 Gbits/sec
Signed-off-by: Fan Du <fan.du@intel.com>
Acked-by: John Heffner <johnwheffner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Quotes from RFC4821 7.2. Selecting Initial Values
It is RECOMMENDED that search_low be initially set to an MTU size
that is likely to work over a very wide range of environments. Given
today's technologies, a value of 1024 bytes is probably safe enough.
The initial value for search_low SHOULD be configurable.
Moreover, set a small value will introduce extra time for the search
to converge. So set the initial probe base mss size to 1024 Bytes.
Signed-off-by: Fan Du <fan.du@intel.com>
Acked-by: John Heffner <johnwheffner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Other users users of the neighbour table use neigh->output as the method
to decided when and which link-layer header to place on a packet.
DECnet has been using neigh->output to decide which DECnet headers to
place on a packet depending which neighbour the packet is destined for.
The DECnet usage isn't totally wrong but it can run into problems if the
neighbour output function is run for a second time as the teql driver
and the bridge netfilter code can do.
Therefore to avoid pathologic problems later down the line and make the
neighbour code easier to understand by refactoring the decnet output
code to only use a neighbour method to add a link layer header to a
packet.
This is done by moving the neigbhour operations lookup from
dn_to_neigh_output to dn_neigh_output_packet.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patches implements the poll_controller support for all
bonding driver. If the slaves have poll_controller net_op defined,
this implementation calls them. This is mode agnostic implementation
and iterates through all slaves (based on mode) and calls respective
handler.
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There is a race condition between e1000_change_mtu's cleanups and
netpoll, when we change the MTU across jumbo size:
Changing MTU frees all the rx buffers:
e1000_change_mtu -> e1000_down -> e1000_clean_all_rx_rings ->
e1000_clean_rx_ring
Then, close to the end of e1000_change_mtu:
pr_info -> ... -> netpoll_poll_dev -> e1000_clean ->
e1000_clean_rx_irq -> e1000_alloc_rx_buffers -> e1000_alloc_frag
And when we come back to do the rest of the MTU change:
e1000_up -> e1000_configure -> e1000_configure_rx ->
e1000_alloc_jumbo_rx_buffers
alloc_jumbo finds the buffers already != NULL, since data (shared with
page in e1000_rx_buffer->rxbuf) has been re-alloc'd, but it's garbage,
or at least not what is expected when in jumbo state.
This results in an unusable adapter (packets don't get through), and a
NULL pointer dereference on the next call to e1000_clean_rx_ring
(other mtu change, link down, shutdown):
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff81194d6e>] put_compound_page+0x7e/0x330
[...]
Call Trace:
[<ffffffff81195445>] put_page+0x55/0x60
[<ffffffff815d9f44>] e1000_clean_rx_ring+0x134/0x200
[<ffffffff815da055>] e1000_clean_all_rx_rings+0x45/0x60
[<ffffffff815df5e0>] e1000_down+0x1c0/0x1d0
[<ffffffff811e2260>] ? deactivate_slab+0x7f0/0x840
[<ffffffff815e21bc>] e1000_change_mtu+0xdc/0x170
[<ffffffff81647050>] dev_set_mtu+0xa0/0x140
[<ffffffff81664218>] do_setlink+0x218/0xac0
[<ffffffff814459e9>] ? nla_parse+0xb9/0x120
[<ffffffff816652d0>] rtnl_newlink+0x6d0/0x890
[<ffffffff8104f000>] ? kvm_clock_read+0x20/0x40
[<ffffffff810a2068>] ? sched_clock_cpu+0xa8/0x100
[<ffffffff81663802>] rtnetlink_rcv_msg+0x92/0x260
By setting the allocator to a dummy version, netpoll can't mess up our
rx buffers. The allocator is set back to a sane value in
e1000_configure_rx.
Fixes: edbbb3ca10 ("e1000: implement jumbo receive with partial descriptors")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
When bringing down an interface netif_carrier_off() should be
one the first things we do, since this will prevent the stack
from queuing more packets to this interface.
This operation is very fast, and should make the device behave
much nicer when trying to bring down an interface under load.
Also, this would Do The Right Thing (TM) if this device has some
sort of fail-over teaming and redirect traffic to the other IF.
Move netif_carrier_off as early as possible.
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
While addressing the pin problem I noticed that all of the pin register
values where having to be pushed onto the stack each time the function was
called. To avoid that I am making them static const so that they should
only need to be allocated once and we can avoid all the instructions to get
them onto the stack..
size before:
text data bss dec hex filename
161477 10512 8 171997 29fdd drivers/net/ethernet/intel/igb/igb.ko
size after:
text data bss dec hex filename
161205 10512 8 171725 29ecd drivers/net/ethernet/intel/igb/igb.ko
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
When building the kernel using the gcc 4.8.3 compiler included in Fedora 20
I was repeatedly seeing the warning:
drivers/net/ethernet/intel/igb/igb_ptp.c: In function ‘igb_ptp_feature_enable_i210’:
drivers/net/ethernet/intel/igb/igb_ptp.c:395:21: warning: ‘pin’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
tssdp &= ~ts_sdp_en[pin];
^
drivers/net/ethernet/intel/igb/igb_ptp.c:471:6: note: ‘pin’ was declared here
int pin;
^
To resolve it I am assigning the pin a value of -1 when it is instantiated.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Starting I219, the NVM will not be mapped to its own BAR, but to an
address region in another bar. The mapping/unmapping is relevant
to older HW only.
CC: John W Linville <linville@tuxdriver.com>
Reported-by: John W Linville <linville@tuxdriver.com>
Signed-off-by: Yanir Lubetkin <yanirx.lubetkin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
The interface to the device flash was modified in i219 and later HW.
This patch better describes the change and the impact on the driver.
CC: John W Linville <linville@tuxdriver.com>
Reported-by: John W Linville <linville@tuxdriver.com>
Signed-off-by: Yanir Lubetkin <yanirx.lubetkin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
net/ipv4/fib_trie.c: In function ‘fib_table_flush_external’:
net/ipv4/fib_trie.c:1572:6: warning: unused variable ‘found’ [-Wunused-variable]
int found = 0;
^
net/ipv4/fib_trie.c:1571:16: warning: unused variable ‘slen’ [-Wunused-variable]
unsigned char slen;
^
Signed-off-by: David S. Miller <davem@davemloft.net>
Scott Feldman says:
====================
switchdev: add IPv4 routing offload
v4:
- Add NETIF_F_NETNS_LOCAL to rocker port feature list to keep rocker
ports in the default netns. Rocker hardware can't be partitioned
to support multiple namespaces, currently. It would be interesting
to add netns support to rocker device by basically adding another
match field to each table to match on some unique netns ID, with
a port knowing it's netns ID. Future work TDB.
- Up-level the RTNH_F_EXTERNAL marking of routes installed to offload
device from driver to switchdev common code. Now driver can't skip
routes. Either it can install the route or it cannot. Yes or No.
If no on any route, all offloading is aborted by removing routes
from offload device and setting ipv4.fib_offload_disabled so no more
routes can be offloaded. This is harsh, but it's our starting point.
We can refine the policies in follow-up work.
- Add new net.ipv4.fib_offload_disabled bool that is set if anything
goes wrong with route offloading. We can refine this later to make
the setting per-device or per-device-port-netdev, but let's start
here simple and refine in follow-up work.
- Rebase against Alex's latest FIB changes. I think I did everything
correctly, and didn't run into any issues with testing, but I'd like
Alex to look over the changes and maybe follow-up with any cleanups.
v3:
Changes based on v2 review comments:
- Move check for custom rules up earlier in patch set, to keep git bisect
safe.
- Simplify the route add/modify failure handling to simple try until
failure, and then on failure, undo everything. The switchdev driver
will return err when route can normally be installed to device, but
the install fails for one reason or another (no space left on device,
etc). If a failure happens, uninstall all routes from the device,
punting forwarding for all routes back to the kernel.
- Scan route's full nexthop list, ensuring all nexthop devs belong
to the same switchdev device, otherwise don't try to install route
to device.
v2:
Changes based on v1 review comments and discussions at netconf:
- Allow route modification, but use same ndo op used for adding route.
Driver/device is expected to modify route in-place, if it can, to avoid
interruption of service.
- Add new RTNH_F_EXTERNAL flag to mark FIB entries offloaded externally.
- Don't offload routes if using custom IP rules. If routes are already
offloaded, and custom IP rules are turned on, flush routes from offload
device. (Offloaded routes are marked with RTNH_F_EXTERNAL).
- Use kernel's neigh resolution code to resolve route's nexthops' neigh
MAC addrs. (Thanks davem, works great!).
- Use fib->fib_priority in rocker driver to give priorities to routes in
OF-DPA unicast route table.
v1:
This patch set adds L3 routing offload support for IPv4 routes. The idea is to
mirror routes installed in the kernel's FIB down to a hardware switch device to
offload the data forwarding path for L3. Only the data forwarding path is
intercepted. Control and management of the kernel's FIB remains with the
kernel.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
The driver implements ndo_switch_fib_ipv4_add/del ops to add/del/mod IPv4
routes to/from switchdev device. Once a route is added to the device, and the
route's nexthops are resolved to neighbor MAC address, the device will forward
matching pkts rather than the kernel. This offloads the L3 forwarding path
from the kernel to the device. Note that control and management planes are
still mananged by Linux; only the data plane is offloaded. Standard routing
control protocols such as OSPF and BGP run on Linux and manage the kernel's FIB
via standard rtm netlink msgs...nothing changes here.
A new hash table is added to rocker to track neighbors. The driver listens for
neighbor updates events using netevent notifier NETEVENT_NEIGH_UPDATE. Any ARP
table updates for ports on this device are recorded in this table. Routes
installed to the device with nexthops that reference neighbors in this table
are "qualified". In the case of a route with nexthops not resolved in the
table, the kernel is asked to resolve the nexthop.
The driver uses fib_info->fib_priority for the priority field in rocker's
unicast routing table.
The device can only forward to pkts matching route dst to resolved nexthops.
Currently, the device only supports single-path routes (i.e. routes with one
nexthop). Equal Cost Multipath (ECMP) route support will be added in followup
patches.
This patch is driver support for unicast IPv4 routing only. Followup patches
will add driver and infrastructure for IPv6 routing and multicast routing.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
Call into the switchdev driver any time an IPv4 fib entry is
added/modified/deleted from the kernel's FIB. The switchdev driver may or
may not install the route to the offload device. In the case where the
driver tries to install the route and something goes wrong (device's routing
table is full, etc), then all of the offloaded routes will be flushed from the
device, route forwarding falls back to the kernel, and no more routes are
offloading.
We can refine this logic later. For now, use the simplist model of offloading
routes up to the point of failure, and then on failure, undo everything and
mark IPv4 offloading disabled.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
If something goes wrong with IPv4 FIB offload, mark entire net offload
disabled. This is brute force policy to basically shut down IPv4 FIB offload
permanently if there is a problem offloading any route to an external device.
We can refine the policy in the future, to handle failures on a per-device or
per-route basis, but for now, this policy is per-net.
What we're trying to avoid is an inconsistent split between the kernel's FIB
and the offload device's FIB. We don't want the device to fwd a pkt
inconsitent with what the kernel would do. An example of a split is if device
has 10.0.0.0/16 and kernel has 10.0.0.0/16 and 10.0.0.0/24, the device wouldn't
see the longest prefix 10.0.0.0/24 and potentially forward pkts incorrectly.
Limited capacity or limited capability are two ways a route may fail to install
to the offload device. We'll not differentiate between failures at this time,
and treat any failure as fatal and mark the net as fib_offload_disabled.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Flesh out ndo wrappers to call into device driver. To call into device driver,
the wrapper must interate over route's nexthops to ensure all nexthop devs
belong to the same switch device. Currently, there is no support for route's
nexthops spanning offloaded and non-offloaded devices, or spanning ports of
multiple offload devices.
Since switch device ports may be stacked under virtual interfaces (bonds and/or
bridges), and the route's nexthop may be on the virtual interface, the wrapper
will traverse the nexthop dev down to the base dev. It's the base dev that's
passed to the switchdev driver's ndo ops.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Keep switchdev FIB offload model simple for now and don't allow custom ip
rules.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add IPv4 fib ndo wrapper funcs and stub them out for now.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add two new ndo ops for IPv4 fib offload support, add and del. Add uses
modifiy semantics if fib entry already offloaded. Drivers implementing the new
ndo ops will return err<0 if programming device fails, for example if device's
tables are full.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Dan Carpenter
David S. Miller
Shani Michaeli
Alexander Duyck
Punnaiah Choudary Kalluri
Willem de Bruijn
Robert Shearman
Petri Gynther
Fan Du
Eric W. Biederman
Mahesh Bandewar
Scott Feldman
Sabrina Dubroca
Eliezer Tamir
Yanir Lubetkin