src/sys/dev/netmap/if_ptnet.c, branch stable/13

net: Remove unneeded NULL check for the allocated ifnet

2024-10-08T10:07:18+00:00

Change 4787572d0580 made if_alloc_domain() never fail, then also do the
wrappers if_alloc(), if_alloc_dev(), and if_gethandle().

No functional change intended.

Reviewed by:	kp, imp, glebius, stevek
MFC after:	2 weeks
Differential Revision:  https://reviews.freebsd.org/D45740

MFC note: This is only a partial MFC, as some drivers do not exist in
stable/13 branch. The if_epair(4) drifts too much from stable/14 so not
included in this MFC.

(cherry picked from commit aa3860851b9f6a6002d135b1cac7736e0995eedc)
(cherry picked from commit 6b1f530935c5f84ec65dad87b7c20c6b7a72a6d3)

sys: Remove $FreeBSD$: two-line .h pattern

2023-08-23T17:43:20+00:00

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Similar commit in current:
(cherry picked from commit 95ee2897e98f)

netmap: drop compatibility FreeBSD code

2022-12-31T12:06:22+00:00

Netmap users on FreeBSD are not supposed to import code from the
github netmap repository anymore. They should use the code that
is available in the src repo. We can therefore drop the compatibility
code.

MFC after:	7 days

(cherry picked from commit 3da494d3246e30a19d2107c8bb8a293ffd5a9da6)

Use NET_TASK_INIT() and NET_GROUPTASK_INIT() for drivers that process

2020-02-11T18:57:07+00:00

incoming packets in taskqueue context.

Reviewed by:	hselasky
Differential Revision:	https://reviews.freebsd.org/D23518

netmap: disable passthrough with no hypervisor support

2020-01-13T21:47:23+00:00

The netmap passthrough subsystem requires proper support in the
hypervisor. In particular, two PCI device ids (from the Red Hat
PCI vendor id 0x1b36) need to be assigned to the two netmap
virtual devices. We then disable these devices until the ids have
not been assigned, in order to avoid conflicts with other
virtual devices emulated by upstream QEMU.

PR:	241774
MFC after:	3 days

tap: add support for virtio-net offloads

2019-10-18T21:53:27+00:00

This patch is part of an effort to make bhyve networking (in particular TCP)
faster. The key strategy to enhance TCP throughput is to let the whole packet
datapath work with TSO/LRO packets (up to 64KB each), so that the per-packet
overhead is amortized over a large number of bytes.
This capability is supported in the guest by means of the vtnet(4) driver,
which is able to handle TSO/LRO packets leveraging the virtio-net header
(see struct virtio_net_hdr and struct virtio_net_hdr_mrg_rxbuf).
A bhyve VM exchanges packets with the host through a network backend,
which can be vale(4) or if_tap(4).
While vale(4) supports TSO/LRO packets, if_tap(4) does not.
This patch extends if_tap(4) with the ability to understand the virtio-net
header, so that a tapX interface can process TSO/LRO packets.
A couple of ioctl commands have been added to configure and probe the
virtio-net header. Once the virtio-net header is set, the tapX interface
acquires all the IFCAP capabilities necessary for TSO/LRO.

Reviewed by:	kevans
Differential Revision:	https://reviews.freebsd.org/D21263

netmap: align if_ptnet to the changes introduced by r347233

2019-05-17T20:29:31+00:00

This removes non-functional SCTP checksum offload support.
More information in the log message of r347233.

MFC after:	2 weeks

netmap: refactor logging macros and pipes

2019-02-05T12:10:48+00:00

Changelist:
    - Replace ND, D and RD macros with nm_prdis, nm_prinf, nm_prerr
      and nm_prlim, to avoid possible naming conflicts.
    - Add netmap_krings_mode_commit() helper function and use that
      to reduce code duplication.
    - Refactor pipes control code to export some functions that
      can be reused by the veth driver (on Linux) and epair(4).
    - Add check to reject API requests with version less than 11.
    - Small code refactoring for the null adapter.

MFC after:	1 week

netmap: improvements to the netmap kloop (CSB mode)

2019-01-23T14:51:36+00:00

Changelist:
    - Add the proper memory barriers in the kloop ring processing
      functions.
    - Fix memory barriers usage in the user helpers (nm_sync_kloop_appl_write,
      nm_sync_kloop_appl_read).
    - Fix nm_kr_txempty() helper to look at rhead rather than rcur. This
      is important since the kloop can read a value of rcur which is ahead
      of the value of rhead (see explanation in nm_sync_kloop_appl_write)
    - Remove obsolete ptnetmap_guest_write_kring_csb() and
      ptnet_guest_read_kring_csb(), and update if_ptnet(4) to use those.
    - Prepare in advance the arguments for netmap_sync_kloop_[tr]x_ring(),
      to make the kloop faster.
    - Provide kernel and user implementation for nm_ldld_barrier() and
      nm_ldst_barrier()

MFC after:	2 weeks

netmap: align codebase to the current upstream (760279cfb2730a585)

2018-12-05T11:57:16+00:00

Changelist:
  - Replace netmap passthrough host support with a more general
    mechanism to call TXSYNC/RXSYNC from an in-kernel event-loop.
    No kernel threads are used to use this feature: the application
    is required to spawn a thread (or a process) and issue a
    SYNC_KLOOP_START (NIOCCTRL) command in the thread body. The
    kernel loop is executed by the ioctl implementation, which returns
    to userspace only when a different thread calls SYNC_KLOOP_STOP
    or the netmap file descriptor is closed.
  - Update the if_ptnet driver to cope with the new data structures,
    and prune all the obsolete ptnetmap code.
  - Add support for "null" netmap ports, useful to allocate netmap_if,
    netmap_ring and netmap buffers to be used by specialized applications
    (e.g. hypervisors). TXSYNC/RXSYNC on these ports have no effect.
  - Various fixes and code refactoring.

Sponsored by:	Sunny Valley Networks
Differential Revision:	https://reviews.freebsd.org/D18015