virtio-net have two usage of hashes: one is RSS and another is hash
reporting. Conventionally the hash calculation was done by the VMM.
However, computing the hash after the queue was chosen defeats the
purpose of RSS.
Another approach is to use eBPF steering program. This approach has
another dow
This new extension will be used by tun to carry the hash values and
types to report with virtio-net headers.
Signed-off-by: Akihiko Odaki
---
include/linux/skbuff.h | 10 ++
net/core/skbuff.c | 3 +++
2 files changed, 13 insertions(+)
diff --git a/include/linux/skbuff.h b/include/
They are useful to implement VIRTIO_NET_F_RSS and
VIRTIO_NET_F_HASH_REPORT.
Signed-off-by: Akihiko Odaki
---
include/linux/virtio_net.h | 198 +
1 file changed, 198 insertions(+)
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
ind
flow_keys_dissector_symmetric is useful to derive a symmetric hash
and to know its source such as IPv4, IPv6, TCP, and UDP.
Signed-off-by: Akihiko Odaki
---
include/net/flow_dissector.h | 1 +
net/core/flow_dissector.c| 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/inc
tap used to simply advance iov_iter when it needs to pad virtio header.
This leaves the garbage in the buffer as is and prevents telling if the
header is padded or contains some real data.
In theory, a user of tap can fill the buffer with zero before calling
read() to avoid such a problem, but lea
tun used to simply advance iov_iter when it needs to pad virtio header.
This leaves the garbage in the buffer as is and prevents telling if the
header is padded or contains some real data.
In theory, a user of tun can fill the buffer with zero before calling
read() to avoid such a problem, but lea
Allow the guest to reuse the hash value to make receive steering
consistent between the host and guest, and to save hash computation.
Signed-off-by: Akihiko Odaki
---
Documentation/networking/tuntap.rst | 7 ++
drivers/net/Kconfig | 1 +
drivers/net/tun.c |
RSS is a receive steering algorithm that can be negotiated to use with
virtio_net. Conventionally the hash calculation was done by the VMM.
However, computing the hash after the queue was chosen defeats the
purpose of RSS.
Another approach is to use eBPF steering program. This approach has
another
The added tests confirm tun can perform RSS and hash reporting, and
reject invalid configurations for them.
Signed-off-by: Akihiko Odaki
---
tools/testing/selftests/net/Makefile | 2 +-
tools/testing/selftests/net/tun.c| 666 ++-
2 files changed, 660 inserti
VIRTIO_NET_F_HASH_REPORT allows to report hash values calculated on the
host. When VHOST_NET_F_VIRTIO_NET_HDR is employed, it will report no
hash values (i.e., the hash_report member is always set to
VIRTIO_NET_HASH_REPORT_NONE). Otherwise, the values reported by the
underlying socket will be repor
10 matches
Mail list logo
