kernel/net/core/netdev-genl.c, branch linux-6.11.y

netdev-genl: Hold rcu_read_lock in napi_get

2024-12-05T12:54:22Z

commit c53bf100f68619acf6cedcf4cf5249a1ca2db0b4 upstream. Hold rcu_read_lock in netdev_nl_napi_get_doit, which calls napi_by_id and is required to be called under rcu_read_lock. Cc: stable@vger.kernel.org Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi") Signed-off-by: Joe Damato Link: https://patch.msgid.link/20241114175157.16604-1-jdamato@fastly.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman

netdev-genl: Set extack and fix error on napi-get

2024-10-10T10:03:15Z

[ Upstream commit 4e3a024b437ec0aee82550cc66a0f4e1a7a88a67 ] In commit 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi"), when an invalid NAPI ID is specified the return value -EINVAL is used and no extack is set. Change the return value to -ENOENT and set the extack. Before this commit: $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ --do napi-get --json='{"id": 451}' Netlink error: Invalid argument nl_len = 36 (20) nl_flags = 0x100 nl_type = 2 error: -22 After this commit: $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ --do napi-get --json='{"id": 451}' Netlink error: No such file or directory nl_len = 44 (28) nl_flags = 0x300 nl_type = 2 error: -2 extack: {'bad-attr': '.id'} Suggested-by: Jakub Kicinski Signed-off-by: Joe Damato Link: https://patch.msgid.link/20240831121707.17562-1-jdamato@fastly.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

netdev-genl: fix error codes when outputting XDP features

2024-06-15T01:04:29Z

-EINVAL will interrupt the dump. The correct error to return if we have more data to dump is -EMSGSIZE. Discovered by doing: for i in `seq 80`; do ip link add type veth; done ./cli.py --dbg-small-recv 5300 --spec netdev.yaml --dump dev-get >> /dev/null [...] nl_len = 64 (48) nl_flags = 0x0 nl_type = 19 nl_len = 20 (4) nl_flags = 0x2 nl_type = 3 error: -22 Fixes: d3d854fd6a1d ("netdev-genl: create a simple family for netdev stuff") Reviewed-by: Amritha Nambiar Reviewed-by: Eric Dumazet Link: https://lore.kernel.org/r/20240613213044.3675745-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

netdev: Add queue stats for TX stop and wake

2024-05-13T21:58:36Z

TX queue stop and wake are counted by some drivers. Support reporting these via netdev-genl queue stats. Signed-off-by: Daniel Jurgens Reviewed-by: Jiri Pirko Reviewed-by: Jason Xing Link: https://lore.kernel.org/r/20240510201927.1821109-2-danielj@nvidia.com Signed-off-by: Jakub Kicinski

netdev: add queue stats

2024-04-30T08:51:33Z

These stats are commonly. Support reporting those via netdev-genl queue stats. name: rx-hw-drops name: rx-hw-drop-overruns name: rx-csum-unnecessary name: rx-csum-none name: rx-csum-bad name: rx-hw-gro-packets name: rx-hw-gro-bytes name: rx-hw-gro-wire-packets name: rx-hw-gro-wire-bytes name: rx-hw-drop-ratelimits name: tx-hw-drops name: tx-hw-drop-errors name: tx-csum-none name: tx-needs-csum name: tx-hw-gso-packets name: tx-hw-gso-bytes name: tx-hw-gso-wire-packets name: tx-hw-gso-wire-bytes name: tx-hw-drop-ratelimits Signed-off-by: Xuan Zhuo Reviewed-by: Jakub Kicinski Signed-off-by: Paolo Abeni

netdev: support dumping a single netdev in qstats

2024-04-23T17:09:49Z

Having to filter the right ifindex in the tests is a bit tedious. Add support for dumping qstats for a single ifindex. Reviewed-by: David Ahern Reviewed-by: Eric Dumazet Link: https://lore.kernel.org/r/20240420023543.3300306-2-kuba@kernel.org Signed-off-by: Jakub Kicinski

netdev: add queue stat for alloc failures

2024-03-08T05:13:26Z

Rx alloc failures are commonly counted by drivers. Support reporting those via netdev-genl queue stats. Acked-by: Stanislav Fomichev Reviewed-by: Amritha Nambiar Reviewed-by: Xuan Zhuo Link: https://lore.kernel.org/r/20240306195509.1502746-3-kuba@kernel.org Signed-off-by: Jakub Kicinski

netdev: add per-queue statistics

2024-03-08T05:13:25Z

The ethtool-nl family does a good job exposing various protocol related and IEEE/IETF statistics which used to get dumped under ethtool -S, with creative names. Queue stats don't have a netlink API, yet, and remain a lion's share of ethtool -S output for new drivers. Not only is that bad because the names differ driver to driver but it's also bug-prone. Intuitively drivers try to report only the stats for active queues, but querying ethtool stats involves multiple system calls, and the number of stats is read separately from the stats themselves. Worse still when user space asks for values of the stats, it doesn't inform the kernel how big the buffer is. If number of stats increases in the meantime kernel will overflow user buffer. Add a netlink API for dumping queue stats. Queue information is exposed via the netdev-genl family, so add the stats there. Support per-queue and sum-for-device dumps. Latter will be useful when subsequent patches add more interesting common stats than just bytes and packets. The API does not currently distinguish between HW and SW stats. The expectation is that the source of the stats will either not matter much (good packets) or be obvious (skb alloc errors). Acked-by: Stanislav Fomichev Reviewed-by: Amritha Nambiar Reviewed-by: Xuan Zhuo Link: https://lore.kernel.org/r/20240306195509.1502746-2-kuba@kernel.org Signed-off-by: Jakub Kicinski

netdev: let netlink core handle -EMSGSIZE errors

2024-03-06T08:07:44Z

Previous change added -EMSGSIZE handling to af_netlink, we don't have to hide these errors any longer. Theoretically the error handling changes from: if (err == -EMSGSIZE) to if (err == -EMSGSIZE && skb->len) everywhere, but in practice it doesn't matter. All messages fit into NLMSG_GOODSIZE, so overflow of an empty skb cannot happen. Reviewed-by: Eric Dumazet Signed-off-by: Jakub Kicinski Reviewed-by: Ido Schimmel Signed-off-by: David S. Miller

netdev-genl: Add PID for the NAPI thread

2023-12-05T02:04:06Z

In the threaded NAPI mode, expose the PID of the NAPI thread. Signed-off-by: Amritha Nambiar Reviewed-by: Sridhar Samudrala Link: https://lore.kernel.org/r/170147335818.5260.10253384006102593087.stgit@anambiarhost.jf.intel.com Signed-off-by: Jakub Kicinski