linux/net/core/dev.h, branch v6.14

net: make netdev netlink ops hold netdev_lock()

2025-01-16T03:13:34Z

In prep for dropping rtnl_lock, start locking netdev->lock in netlink genl ops. We need to be using netdev->up instead of flags & IFF_UP. We can remove the RCU lock protection for the NAPI since NAPI list is protected by netdev->lock already. Reviewed-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250115035319.559603-8-kuba@kernel.org Signed-off-by: Jakub Kicinski

net: add netdev->up protected by netdev_lock()

2025-01-16T03:13:34Z

Some uAPI (netdev netlink) hide net_device's sub-objects while the interface is down to ensure uniform behavior across drivers. To remove the rtnl_lock dependency from those uAPIs we need a way to safely tell if the device is down or up. Add an indication of whether device is open or closed, protected by netdev->lock. The semantics are the same as IFF_UP, but taking netdev_lock around every write to ->flags would be a lot of code churn. We don't want to blanket the entire open / close path by netdev_lock, because it will prevent us from applying it to specific structures - core helpers won't be able to take that lock from any function called by the drivers on open/close paths. So the state of the flag is "pessimistic", as in it may report false negatives, but never false positives. Reviewed-by: Joe Damato Reviewed-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250115035319.559603-5-kuba@kernel.org Signed-off-by: Jakub Kicinski

net: add helpers for lookup and walking netdevs under netdev_lock()

2025-01-16T03:13:33Z

Add helpers for accessing netdevs under netdev_lock(). There's some careful handling needed to find the device and lock it safely, without it getting unregistered, and without taking rtnl_lock (the latter being the whole point of the new locking, after all). Reviewed-by: Eric Dumazet Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250115035319.559603-4-kuba@kernel.org Signed-off-by: Jakub Kicinski

net: hide the definition of dev_get_by_napi_id()

2025-01-11T02:37:01Z

There are no module callers of dev_get_by_napi_id(), and commit d1cacd747768 ("netdev: prevent accessing NAPI instances from another namespace") proves that getting NAPI by id needs to be done with care. So hide dev_get_by_napi_id(). Reviewed-by: Jacob Keller Reviewed-by: Kalesh AP Reviewed-by: Joe Damato Link: https://patch.msgid.link/20250110004924.3212260-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

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

2025-01-10T00:11:47Z

Cross-merge networking fixes after downstream PR (net-6.13-rc7). Conflicts: a42d71e322a8 ("net_sched: sch_cake: Add drop reasons") 737d4d91d35b ("sched: sch_cake: add bounds checks to host bulk flow fairness counts") Adjacent changes: drivers/net/ethernet/meta/fbnic/fbnic.h 3a856ab34726 ("eth: fbnic: add IRQ reuse support") 95978931d55f ("eth: fbnic: Revert "eth: fbnic: Add hardware monitoring support via HWMON interface"") Signed-off-by: Jakub Kicinski

netdev: prevent accessing NAPI instances from another namespace

2025-01-08T18:21:00Z

The NAPI IDs were not fully exposed to user space prior to the netlink API, so they were never namespaced. The netlink API must ensure that at the very least NAPI instance belongs to the same netns as the owner of the genl sock. napi_by_id() can become static now, but it needs to move because of dev_get_by_napi_id(). Cc: stable@vger.kernel.org Fixes: 1287c1ae0fc2 ("netdev-genl: Support setting per-NAPI config values") Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi") Reviewed-by: Sridhar Samudrala Reviewed-by: Joe Damato Link: https://patch.msgid.link/20250106180137.1861472-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

net: Make net_hwtstamp_validate accessible

2024-12-16T12:51:40Z

Make the net_hwtstamp_validate function accessible in prevision to use it from ethtool to validate the hwtstamp configuration before setting it. Reviewed-by: Florian Fainelli Reviewed-by: Jacob Keller Signed-off-by: Kory Maincent Signed-off-by: David S. Miller

net: Make dev_get_hwtstamp_phylib accessible

2024-12-16T12:51:40Z

Make the dev_get_hwtstamp_phylib function accessible in prevision to use it from ethtool to read the hwtstamp current configuration. Reviewed-by: Florian Fainelli Reviewed-by: Jacob Keller Signed-off-by: Kory Maincent Signed-off-by: David S. Miller

net: Add napi_struct parameter irq_suspend_timeout

2024-11-12T02:45:05Z

Add a per-NAPI IRQ suspension parameter, which can be get/set with netdev-genl. This patch doesn't change any behavior but prepares the code for other changes in the following commits which use irq_suspend_timeout as a timeout for IRQ suspension. Signed-off-by: Martin Karsten Co-developed-by: Joe Damato Signed-off-by: Joe Damato Tested-by: Joe Damato Tested-by: Martin Karsten Acked-by: Stanislav Fomichev Reviewed-by: Sridhar Samudrala Link: https://patch.msgid.link/20241109050245.191288-2-jdamato@fastly.com Signed-off-by: Jakub Kicinski

net: napi: Add napi_config

2024-10-15T00:54:29Z

Add a persistent NAPI config area for NAPI configuration to the core. Drivers opt-in to setting the persistent config for a NAPI by passing an index when calling netif_napi_add_config. napi_config is allocated in alloc_netdev_mqs, freed in free_netdev (after the NAPIs are deleted). Drivers which call netif_napi_add_config will have persistent per-NAPI settings: NAPI IDs, gro_flush_timeout, and defer_hard_irq settings. Per-NAPI settings are saved in napi_disable and restored in napi_enable. Co-developed-by: Martin Karsten Signed-off-by: Martin Karsten Signed-off-by: Joe Damato Reviewed-by: Jakub Kicinski Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20241011184527.16393-6-jdamato@fastly.com Signed-off-by: Jakub Kicinski