linux.git/include/net/netdev_queues.h, branch v6.18.21

net: add helper to pre-check if PP for an Rx queue will be unreadable

2025-09-04T08:19:17+00:00

mlx5 pokes into the rxq state to check if the queue has a memory
provider, and therefore whether it may produce unreadable mem.
Add a helper for doing this in the page pool API. fbnic will want
a similar thing (tho, for a slightly different reason).

Reviewed-by: Mina Almasry 
Signed-off-by: Jakub Kicinski 
Link: https://patch.msgid.link/20250901211214.1027927-11-kuba@kernel.org
Signed-off-by: Paolo Abeni

queue_api: add support for fetching per queue DMA dev

2025-08-28T23:05:31+00:00

For zerocopy (io_uring, devmem), there is an assumption that the
parent device can do DMA. However that is not always the case:
- Scalable Function netdevs [1] have the DMA device in the grandparent.
- For Multi-PF netdevs [2] queues can be associated to different DMA
devices.

This patch introduces the a queue based interface for allowing drivers
to expose a different DMA device for zerocopy.

[1] Documentation/networking/device_drivers/ethernet/mellanox/mlx5/switchdev.rst
[2] Documentation/networking/multi-pf-netdev.rst

Signed-off-by: Dragos Tatulea 
Reviewed-by: Pavel Begunkov 
Reviewed-by: Mina Almasry 
Link: https://patch.msgid.link/20250827144017.1529208-3-dtatulea@nvidia.com
Signed-off-by: Jakub Kicinski

queue_api: add subqueue variant netif_subqueue_sent

2025-06-10T22:27:18+00:00

Add a new function, netif_subqueue_sent, which is a wrapper for
netdev_tx_sent_queue.

Drivers that use the subqueue variant macros, netif_subqueue_xxx,
identify queue by index and are not required to obtain
struct netdev_queue explicitly.

Such drivers still need to call netdev_tx_sent_queue which is a
counterpart of netif_subqueue_completed_wake. Allowing drivers to use a
subqueue variant for this purpose improves their code consistency by
always referring to queue by its index.

Signed-off-by: Gur Stavi 
Link: https://patch.msgid.link/909a5c92db49cad39f0954d6cb86775e6480ef4c.1749038081.git.gur.stavi@huawei.com
Signed-off-by: Jakub Kicinski

queue_api: reduce risk of name collision over txq

2025-05-20T03:09:02+00:00

Rename local variable in macros from txq to _txq.
When macro parameter get_desc is expended it is likely to have a txq
token that refers to a different txq variable at the caller's site.

Signed-off-by: Gur Stavi 
Reviewed-by: Jakub Kicinski 
Link: https://patch.msgid.link/95b60d218f004308486d92ed17c8cc6f28bac09d.1747559621.git.gur.stavi@huawei.com
Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2025-05-08T15:59:02+00:00

Cross-merge networking fixes after downstream PR (net-6.15-rc6).

No conflicts.

Adjacent changes:

net/core/dev.c:
  08e9f2d584c4 ("net: Lock netdevices during dev_shutdown")
  a82dc19db136 ("net: avoid potential race between netdev_get_by_index_lock() and netns switch")

Signed-off-by: Jakub Kicinski

net: export a helper for adding up queue stats

2025-05-08T09:56:12+00:00

Older drivers and drivers with lower queue counts often have a static
array of queues, rather than allocating structs for each queue on demand.
Add a helper for adding up qstats from a queue range. Expectation is
that driver will pass a queue range [netdev->real_num_*x_queues, MAX).
It was tempting to always use num_*x_queues as the end, but virtio
seems to clamp its queue count after allocating the netdev. And this
way we can trivaly reuse the helper for [0, real_..).

Signed-off-by: Jakub Kicinski 
Link: https://patch.msgid.link/20250507003221.823267-2-kuba@kernel.org
Signed-off-by: Paolo Abeni

netdev: depend on netdev->lock for qstats in ops locked drivers

2025-04-10T00:01:52+00:00

We mostly needed rtnl_lock in qstat to make sure the queue count
is stable while we work. For "ops locked" drivers the instance
lock protects the queue count, so we don't have to take rtnl_lock.

For currently ops-locked drivers: netdevsim and bnxt need
the protection from netdev going down while we dump, which
instance lock provides. gve doesn't care.

Reviewed-by: Joe Damato 
Acked-by: Stanislav Fomichev 
Link: https://patch.msgid.link/20250408195956.412733-9-kuba@kernel.org
Signed-off-by: Jakub Kicinski

net: report csum_complete via qstats

2025-02-13T00:37:35+00:00

Commit 13c7c941e729 ("netdev: add qstat for csum complete") reserved
the entry for csum complete in the qstats uAPI. Start reporting this
value now that we have a driver which needs it.

Reviewed-by: Joe Damato 
Reviewed-by: Alexander Lobakin 
Link: https://patch.msgid.link/20250211181356.580800-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski

net: devmem: don't call queue stop / start when the interface is down

2025-02-08T01:21:02+00:00

We seem to be missing a netif_running() check from the devmem
installation path. Starting a queue on a stopped device makes
no sense. We still want to be able to allocate the memory, just
to test that the device is indeed setting up the page pools
in a memory provider compatible way.

This is not a bug fix, because existing drivers check if
the interface is down as part of the ops. But new drivers
shouldn't have to do this, as long as they can correctly
alloc/free while down.

Reviewed-by: Mina Almasry 
Link: https://patch.msgid.link/20250206225638.1387810-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski

net: move HDS config from ethtool state

2025-01-20T19:44:57+00:00

Separate the HDS config from the ethtool state struct.
The HDS config contains just simple parameters, not state.
Having it as a separate struct will make it easier to clone / copy
and also long term potentially make it per-queue.

Reviewed-by: Michael Chan 
Link: https://patch.msgid.link/20250119020518.1962249-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski