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netdev-genl: Elide napi_id when not present

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There are at least two cases where napi_id may not present and the
napi_id should be elided:

1. Queues could be created, but napi_enable may not have been called
   yet. In this case, there may be a NAPI but it may not have an ID and
   output of a napi_id should be elided.

2. TX-only NAPIs currently do not have NAPI IDs. If a TX queue happens
   to be linked with a TX-only NAPI, elide the NAPI ID from the netlink
   output as a NAPI ID of 0 is not useful for users.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250205193751.297211-1-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Joe Damato 2025-02-05 19:37:47 +00:00 • committed by Jakub Kicinski
parent 71f0dd5a32
commit 6597e8d358
2 changed files with 14 additions and 5 deletions
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5
include/net/busy_poll.h
View file

@ -24,6 +24,11 @@
*/
#define MIN_NAPI_ID ((unsigned int)(NR_CPUS + 1))
static inline bool napi_id_valid(unsigned int napi_id)
{
return napi_id >= MIN_NAPI_ID;
}
#define BUSY_POLL_BUDGET 8
#ifdef CONFIG_NET_RX_BUSY_POLL

14
net/core/netdev-genl.c
View file

@ -365,6 +365,13 @@ int netdev_nl_napi_set_doit(struct sk_buff *skb, struct genl_info *info)
return err;
}
static int nla_put_napi_id(struct sk_buff *skb, const struct napi_struct *napi)
{
if (napi && napi_id_valid(napi->napi_id))
return nla_put_u32(skb, NETDEV_A_QUEUE_NAPI_ID, napi->napi_id);
return 0;
}
static int
netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
u32 q_idx, u32 q_type, const struct genl_info *info)
@ -386,9 +393,7 @@ netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
switch (q_type) {
case NETDEV_QUEUE_TYPE_RX:
rxq = __netif_get_rx_queue(netdev, q_idx);
if (rxq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
rxq->napi->napi_id))
if (nla_put_napi_id(rsp, rxq->napi))
goto nla_put_failure;
params = &rxq->mp_params;
@ -398,8 +403,7 @@ netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
break;
case NETDEV_QUEUE_TYPE_TX:
txq = netdev_get_tx_queue(netdev, q_idx);
if (txq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID,
txq->napi->napi_id))
if (nla_put_napi_id(rsp, txq->napi))
goto nla_put_failure;
}