Later version of 'struct xsk_umem_config' contains additional field
'flags'. OVS doesn't use that field passing uninitialized stack
memory to the 'xsk_umem__create()' call that could fail with
'Invalid argument' if 'flags' are non-zero or, even worse, create
umem with unexpected properties.
We need to clear the whole structure explicitly to avoid this kind
of issues.
Fixes: 0de1b425962d ("netdev-afxdp: add new netdev type for AF_XDP.")
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Signed-off-by: William Tu <u9012063@gmail.com>
If for some reason the last element in the batch was already pushed on
the stack, none of the elements where pushed. This was leading to
buffer starvation.
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
netdev-afxdp requires XDP program to be loaded. When prog_id == 0,
it indicates no XDP program, so return error and free resources.
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
These are valid statistics of a network interface and should be
exposed via custom stats.
The same MACRO trick as in vswitchd/bridge.c is used to reduce code
duplication and easily add new stats if necessary in the future.
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
In case of failure of 'xsk_configure_all()', 'n_rxq' and 'xdpmode'
will remain in a new state. This will result in successful
reconfiguration (immediate return, because configuration is already
applied) if 'netdev_reconfigure()' will be called again.
Same issue was fixed previously for netdev-dpdk using 'dev->started'
flag in commit:
606f66507250 ("netdev-dpdk: Don't use PMD driver if not configured successfully")
Let's use similar approach with checking the 'dev->xsks' which only
exists if configuration was successful.
Additionally implemented 'netdev_afxdp_construct()' function to
explicitly initialize all the specific fields and request the
reconfiguration.
CC: William Tu <u9012063@gmail.com>
Fixes: 0de1b425962d ("netdev-afxdp: add new netdev type for AF_XDP.")
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
The patch introduces experimental AF_XDP support for OVS netdev.
AF_XDP, the Address Family of the eXpress Data Path, is a new Linux socket
type built upon the eBPF and XDP technology. It is aims to have comparable
performance to DPDK but cooperate better with existing kernel's networking
stack. An AF_XDP socket receives and sends packets from an eBPF/XDP program
attached to the netdev, by-passing a couple of Linux kernel's subsystems
As a result, AF_XDP socket shows much better performance than AF_PACKET
For more details about AF_XDP, please see linux kernel's
Documentation/networking/af_xdp.rst. Note that by default, this feature is
not compiled in.
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
