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path: root/drivers/net/netdevsim (follow)
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2018-03-31netdevsim: Change nsim_devlink_setup to return error to callerDavid Ahern3-8/+15
Change nsim_devlink_setup to return any error back to the caller and update nsim_init to handle it. Requested-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-29netdevsim: Add simple FIB resource controller via devlinkDavid Ahern5-1/+615
Add devlink support to netdevsim and use it to implement a simple, profile based resource controller. Only one controller is needed per namespace, so the first netdevsim netdevice in a namespace registers with devlink. If that device is deleted, the resource settings are deleted. The resource controller allows a user to limit the number of IPv4 and IPv6 FIB entries and FIB rules. The resource paths are: /IPv4 /IPv4/fib /IPv4/fib-rules /IPv6 /IPv6/fib /IPv6/fib-rules The IPv4 and IPv6 top level resources are unlimited in size and can not be changed. From there, the number of FIB entries and FIB rule entries are unlimited by default. A user can specify a limit for the fib and fib-rules resources: $ devlink resource set netdevsim/netdevsim0 path /IPv4/fib size 96 $ devlink resource set netdevsim/netdevsim0 path /IPv4/fib-rules size 16 $ devlink resource set netdevsim/netdevsim0 path /IPv6/fib size 64 $ devlink resource set netdevsim/netdevsim0 path /IPv6/fib-rules size 16 $ devlink dev reload netdevsim/netdevsim0 such that the number of rules or routes is limited (96 ipv4 routes in the example above): $ for n in $(seq 1 32); do ip ro add 10.99.$n.0/24 dev eth1; done Error: netdevsim: Exceeded number of supported fib entries. $ devlink resource show netdevsim/netdevsim0 netdevsim/netdevsim0: name IPv4 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables non resources: name fib size 96 occ 96 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables ... With this template in place for resource management, it is fairly trivial to extend and shows one way to implement a simple counter based resource controller typical of network profiles. Currently, devlink only supports initial namespace. Code is in place to adapt netdevsim to a per namespace controller once the network namespace issues are resolved. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-01netdevsim: fix overflow on the error pathJakub Kicinski1-3/+2
Undo loop condition on the error path would cause the i counter to go below zero, if allocation failure happened with the first (i.e. 0th) element of the array. Fixes: 395cacb5f1a0 ("netdevsim: bpf: support fake map offload") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-01-25netdevsim: use tc_cls_can_offload_and_chain0()Jakub Kicinski1-4/+1
Make use of tc_cls_can_offload_and_chain0() to set extack msg in case ethtool tc offload flag is not set or chain unsupported. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-23selftests/bpf: check bpf verifier log buffer usage works for HW offloadQuentin Monnet1-0/+6
Make netdevsim print a message to the BPF verifier log buffer when a program is offloaded. Then use this message in hardware offload selftests to make sure that using this buffer actually prints the message to the console for eBPF hardware offload. The message is appended after the last instruction is processed with the verifying function from netdevsim. Output looks like the following: $ tc filter add dev foo ingress bpf obj sample_ret0.o \ sec .text verbose skip_sw Prog section '.text' loaded (5)! - Type: 3 - Instructions: 2 (0 over limit) - License: Verifier analysis: 0: (b7) r0 = 0 1: (95) exit [netdevsim] Hello from netdevsim! processed 2 insns, stack depth 0 "verbose" flag is required to see it in the console since netdevsim does not throw an error after printing the message. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-23netdevsim: don't compile BPF code if syscall not enabledJakub Kicinski2-1/+33
We should not compile netdevsim/bpf.c if BPF syscall is not enabled. Otherwise bpf core would have to provide wrappers for all functions offload drivers may call, even though system will never see a BPF object. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-23netdevsim: add extack support for TC eBPF offloadQuentin Monnet1-7/+28
Use the recently added extack support for TC eBPF filters in netdevsim. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-01-18netdevsim: bpf: support fake map offloadJakub Kicinski2-0/+249
Add to netdevsim ability to pretend it's offloading BPF maps. We only allow allocation of tiny 2 entry maps, to keep things simple. Mutex lock may seem heavy for the operations we perform, but we want to make sure callbacks can sleep. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2017-12-31bpf: offload: allow netdev to disappear while verifier is runningJakub Kicinski1-1/+1
To allow verifier instruction callbacks without any extra locking NETDEV_UNREGISTER notification would wait on a waitqueue for verifier to finish. This design decision was made when rtnl lock was providing all the locking. Use the read/write lock instead and remove the workqueue. Verifier will now call into the offload code, so dev_ops are moved to offload structure. Since verifier calls are all under bpf_prog_is_dev_bound() we no longer need static inline implementations to please builds with CONFIG_NET=n. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2017-12-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-11/+14
Lots of overlapping changes. Also on the net-next side the XDP state management is handled more in the generic layers so undo the 'net' nfp fix which isn't applicable in net-next. Include a necessary change by Jakub Kicinski, with log message: ==================== cls_bpf no longer takes care of offload tracking. Make sure netdevsim performs necessary checks. This fixes a warning caused by TC trying to remove a filter it has not added. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-20netdevsim: correctly check return value of debugfs_create_dirPrashant Bhole2-6/+8
- Checking return value with IS_ERROR_OR_NULL - Added error handling where it was not handled Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-20netdevsim: bpf: remove unused variableJakub Kicinski1-3/+0
skip_sw is set but no longer used. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-20netdevsim: declare struct device_type as staticJakub Kicinski1-1/+1
struct device_type nsim_dev_type created for SR-IOV support should be static. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-05netdevsim: make functions nsim_bpf_create_prog and nsim_bpf_destroy_prog staticColin Ian King1-2/+2
Functions nsim_bpf_create_prog and nsim_bpf_destroy_prog are local to the source and do not need to be in global scope, so make them static. Cleans up sparse warnings: symbol 'nsim_bpf_create_prog' was not declared. Should it be static? symbol 'nsim_bpf_destroy_prog' was not declared. Should it be static? Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-03netdevsim: add SR-IOV functionalityJakub Kicinski2-2/+284
dummy driver was extended with VF-related netdev APIs for testing SR-IOV-related software. netdevsim did not exist back then. Implement SR-IOV functionality in netdevsim. Notable difference is that since netdevsim has no module parameters, we will actually create a device with sriov_numvfs attribute for each netdev. The zero MAC address is accepted as some HW use it to mean any address is allowed. Link state is also now validated. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2017-12-03netdevsim: add bpf offload supportJakub Kicinski4-1/+529
Add support for loading programs for netdevsim devices and expose the related information via DebugFS. Both offload of XDP and cls_bpf programs is supported. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2017-12-03netdevsim: add software driver for testing offloadsJakub Kicinski3-0/+150
To be able to run selftests without any hardware required we need a software model. The model can also serve as an example implementation for those implementing actual HW offloads. The dummy driver have previously been extended to test SR-IOV, but the general consensus seems to be against adding further features to it. Add a new driver for purposes of software modelling only. eBPF and SR-IOV will be added here shortly, others are invited to further extend the driver with their offload models. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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