Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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# gpg: Signature made Mon 21 Jul 2025 01:56:45 EDT
# gpg: using RSA key 215D46F48246689EC77F3562EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [full]
# Primary key fingerprint: 215D 46F4 8246 689E C77F 3562 EF04 965B 398D 6211

* tag 'net-pull-request' of https://github.com/jasowang/qemu:
net/vhost-user: Remove unused "err" from chr_closed_bh() (CID 1612365)
net/passt: Initialize "error" variable in net_passt_send() (CID 1612368)
net/passt: Check return value of g_remove() in net_passt_cleanup() (CID 1612369)
net/passt: Remove dead code in passt_vhost_user_start error path (CID 1612371)
net/vhost-user: Remove unused "err" from net_vhost_user_event() (CID 1612372)
net/passt: Remove unused "err" from passt_vhost_user_event() (CID 1612375)
hw/net/npcm_gmac.c: Drop 'buf' local variable
hw/net/npcm_gmac.c: Correct test for when to reallocate packet buffer
hw/net/npcm_gmac.c: Unify length and prev_buf_size variables
hw/net/npcm_gmac.c: Send the right data for second packet in a row
tap: fix net_init_tap() return code
net/tap: drop too small packets

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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net/passt: Initialize "error" variable in net_passt_send() (CID 1612368)

This was flagged by Coverity as a memory illegal access.

Initialize the pointer to NULL at declaration.

Signed-off-by: Laur

net/passt: Initialize "error" variable in net_passt_send() (CID 1612368)

This was flagged by Coverity as a memory illegal access.

Initialize the pointer to NULL at declaration.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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net/passt: Check return value of g_remove() in net_passt_cleanup() (CID 1612369)

If g_remove() fails, use warn_report() to log an error.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-

net/passt: Check return value of g_remove() in net_passt_cleanup() (CID 1612369)

If g_remove() fails, use warn_report() to log an error.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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net/passt: Remove dead code in passt_vhost_user_start error path (CID 1612371)

In passt_vhost_user_start(), if vhost_net_init() fails, the "net"
variable is NULL and execution jumps to the "err:" la

net/passt: Remove dead code in passt_vhost_user_start error path (CID 1612371)

In passt_vhost_user_start(), if vhost_net_init() fails, the "net"
variable is NULL and execution jumps to the "err:" label.

The cleanup code within this label is conditioned on "if (net)",
which can never be true in this error case. This makes the cleanup
block dead code, as reported by Coverity (CID 1612371).

Refactor the error handling to occur inline, removing the goto and
the unreachable cleanup block.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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net/passt: Remove unused "err" from passt_vhost_user_event() (CID 1612375)

The "err" variable was declared but never used within the
passt_vhost_user_event() function. This resulted in a dead code
w

net/passt: Remove unused "err" from passt_vhost_user_event() (CID 1612375)

The "err" variable was declared but never used within the
passt_vhost_user_event() function. This resulted in a dead code
warning (CID 1612375) from Coverity.

Remove the unused variable and the associated error block
to resolve the issue.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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# gpg: Signature made Mon 14 Jul 2025 01:28:27 EDT
# gpg: using RSA key 215D46F48246689EC77F3562EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [full]
# Primary key fingerprint: 215D 46F4 8246 689E C77F 3562 EF04 965B 398D 6211

* tag 'net-pull-request' of https://github.com/jasowang/qemu:
net/passt: Implement vhost-user backend support
net: Add passt network backend
net: Add is_vhost_user flag to vhost_net struct
net: Allow network backends to advertise max TX queue size
net: Add save_acked_features callback to vhost_net
net: Add get_acked_features callback to VhostNetOptions
net: Consolidate vhost feature bits into vhost_net structure
net: Add get_vhost_net callback to NetClientInfo
vhost_net: Rename vhost_set_vring_enable() for clarity
net: Define net_client_set_link()
net: Refactor stream logic for reuse in '-net passt'
virtio-net: Add queues for RSS during migration
net: fix buffer overflow in af_xdp_umem_create()

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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net/passt: Implement vhost-user backend support

This commit adds support for the vhost-user interface to the passt
network backend, enabling high-performance, accelerated networking for
guests using

net/passt: Implement vhost-user backend support

This commit adds support for the vhost-user interface to the passt
network backend, enabling high-performance, accelerated networking for
guests using passt.

The passt backend can now operate in a vhost-user mode, where it
communicates with the guest's virtio-net device over a socket pair
using the vhost-user protocol. This offloads the datapath from the
main QEMU loop, significantly improving network performance.

When the vhost-user=on option is used with -netdev passt, the new
vhost initialization path is taken instead of the standard
stream-based connection.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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net: Add passt network backend

This commit introduces support for passt as a new network backend.
passt is an unprivileged, user-mode networking solution that provides
connectivity for virtual machi

net: Add passt network backend

This commit introduces support for passt as a new network backend.
passt is an unprivileged, user-mode networking solution that provides
connectivity for virtual machines by launching an external helper process.

The implementation reuses the generic stream data handling logic. It
launches the passt binary using GSubprocess, passing it a file
descriptor from a socketpair() for communication. QEMU connects to
the other end of the socket pair to establish the network data stream.

The PID of the passt daemon is tracked via a temporary file to
ensure it is terminated when QEMU exits.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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