net: checksum: Convert data to void *

Convert the data parameter of net_checksum_calculate() to void * to
save unnecessary casts for callers.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>

net: checksum: Convert data to void *

Convert the data parameter of net_checksum_calculate() to void * to
save unnecessary casts for callers.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

show more ...

net: mark struct ip_header as QEMU_PACKED

The ip_header is not actually guaranteed to be aligned. We attempt to
deal with this in some places such as net_checksum_calculate() by
using stw_be_p and s

net: mark struct ip_header as QEMU_PACKED

The ip_header is not actually guaranteed to be aligned. We attempt to
deal with this in some places such as net_checksum_calculate() by
using stw_be_p and so on to access the fields, but this is not
sufficient to be correct, because even accessing a byte member
within an unaligned struct is undefined behaviour. The clang
sanitizer will emit warnings like these if net_checksum_calculate()
is called:

Stopping network: ../../net/checksum.c:106:9: runtime error: member access within misaligned address 0x556aad9b502e for type 'struct ip_header', which requires 4 byte alignment
0x556aad9b502e: note: pointer points here
34 56 08 00 45 00 01 48 a5 09 40 00 40 11 7c 8b 0a 00 02 0f 0a 00 02 02 00 44 00 43 01 34 19 56
^
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../net/checksum.c:106:9 in
../../net/checksum.c:106:9: runtime error: load of misaligned address 0x556aad9b502e for type 'uint8_t' (aka 'unsigned char'), which requires 4 byte alignment
0x556aad9b502e: note: pointer points here
34 56 08 00 45 00 01 48 a5 09 40 00 40 11 7c 8b 0a 00 02 0f 0a 00 02 02 00 44 00 43 01 34 19 56
^

Fix this by marking the ip_header struct as QEMU_PACKED, so that
the compiler knows that it might be unaligned and will generate
the right code for accessing fields.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241114141619.806652-3-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

show more ...

net: Remove deadcode

net_hub_port_find is unused since 2018's commit
af1a5c3eb4 ("net: Remove the deprecated "vlan" parameter")

qemu_receive_packet_iov is unused since commit
ffbd2dbd8e ("e1000

net: Remove deadcode

net_hub_port_find is unused since 2018's commit
af1a5c3eb4 ("net: Remove the deprecated "vlan" parameter")

qemu_receive_packet_iov is unused since commit
ffbd2dbd8e ("e1000e: Perform software segmentation for loopback")

in turn it was the last user of qemu_net_queue_receive_iov.

Remove them.

Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

show more ...

net: Remove receive_raw()

While netmap implements virtio-net header, it does not implement
receive_raw(). Instead of implementing receive_raw for netmap, add
virtio-net headers in the common code an

net: Remove receive_raw()

While netmap implements virtio-net header, it does not implement
receive_raw(). Instead of implementing receive_raw for netmap, add
virtio-net headers in the common code and use receive_iov()/receive()
instead. This also fixes the buffer size for the virtio-net header.

Fixes: fbbdbddec0 ("tap: allow extended virtio header with hash info")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

show more ...

tap: Remove qemu_using_vnet_hdr()

Since qemu_set_vnet_hdr_len() is always called when
qemu_using_vnet_hdr() is called, we can merge them and save some code.

For consistency, express that the virtio

tap: Remove qemu_using_vnet_hdr()

Since qemu_set_vnet_hdr_len() is always called when
qemu_using_vnet_hdr() is called, we can merge them and save some code.

For consistency, express that the virtio-net header is not in use by
returning 0 with qemu_get_vnet_hdr_len() instead of having a dedicated
function, qemu_get_using_vnet_hdr().

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

show more ...