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linux/net/core/netdev-genl.c
Amritha Nambiar db4704f4e4 netdev-genl: Add PID for the NAPI thread 
In the threaded NAPI mode, expose the PID of the NAPI thread.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Link: https://lore.kernel.org/r/170147335818.5260.10253384006102593087.stgit@anambiarhost.jf.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-12-04 18:04:06 -08:00

516 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/netdevice.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/xdp.h>
#include <net/xdp_sock.h>
#include <net/netdev_rx_queue.h>
#include <net/busy_poll.h>
#include "netdev-genl-gen.h"
#include "dev.h"
struct netdev_nl_dump_ctx {
unsigned long ifindex;
unsigned int rxq_idx;
unsigned int txq_idx;
unsigned int napi_id;
};
static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)
{
NL_ASSERT_DUMP_CTX_FITS(struct netdev_nl_dump_ctx);
return (struct netdev_nl_dump_ctx *)cb->ctx;
}
static int
netdev_nl_dev_fill(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info)
{
u64 xsk_features = 0;
u64 xdp_rx_meta = 0;
void *hdr;
hdr = genlmsg_iput(rsp, info);
if (!hdr)
return -EMSGSIZE;
#define XDP_METADATA_KFUNC(_, flag, __, xmo) \
if (netdev->xdp_metadata_ops && netdev->xdp_metadata_ops->xmo) \
xdp_rx_meta |= flag;
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
if (netdev->xsk_tx_metadata_ops) {
if (netdev->xsk_tx_metadata_ops->tmo_fill_timestamp)
xsk_features |= NETDEV_XSK_FLAGS_TX_TIMESTAMP;
if (netdev->xsk_tx_metadata_ops->tmo_request_checksum)
xsk_features |= NETDEV_XSK_FLAGS_TX_CHECKSUM;
}
if (nla_put_u32(rsp, NETDEV_A_DEV_IFINDEX, netdev->ifindex) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_FEATURES,
netdev->xdp_features, NETDEV_A_DEV_PAD) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XDP_RX_METADATA_FEATURES,
xdp_rx_meta, NETDEV_A_DEV_PAD) ||
nla_put_u64_64bit(rsp, NETDEV_A_DEV_XSK_FEATURES,
xsk_features, NETDEV_A_DEV_PAD)) {
genlmsg_cancel(rsp, hdr);
return -EINVAL;
}
if (netdev->xdp_features & NETDEV_XDP_ACT_XSK_ZEROCOPY) {
if (nla_put_u32(rsp, NETDEV_A_DEV_XDP_ZC_MAX_SEGS,
netdev->xdp_zc_max_segs)) {
genlmsg_cancel(rsp, hdr);
return -EINVAL;
}
}
genlmsg_end(rsp, hdr);
return 0;
}
static void
netdev_genl_dev_notify(struct net_device *netdev, int cmd)
{
struct genl_info info;
struct sk_buff *ntf;
if (!genl_has_listeners(&netdev_nl_family, dev_net(netdev),
NETDEV_NLGRP_MGMT))
return;
genl_info_init_ntf(&info, &netdev_nl_family, cmd);
ntf = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!ntf)
return;
if (netdev_nl_dev_fill(netdev, ntf, &info)) {
nlmsg_free(ntf);
return;
}
genlmsg_multicast_netns(&netdev_nl_family, dev_net(netdev), ntf,
0, NETDEV_NLGRP_MGMT, GFP_KERNEL);
}
int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *netdev;
struct sk_buff *rsp;
u32 ifindex;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_DEV_IFINDEX))
return -EINVAL;
ifindex = nla_get_u32(info->attrs[NETDEV_A_DEV_IFINDEX]);
rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!rsp)
return -ENOMEM;
rtnl_lock();
netdev = __dev_get_by_index(genl_info_net(info), ifindex);
if (netdev)
err = netdev_nl_dev_fill(netdev, rsp, info);
else
err = -ENODEV;
rtnl_unlock();
if (err)
goto err_free_msg;
return genlmsg_reply(rsp, info);
err_free_msg:
nlmsg_free(rsp);
return err;
}
int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
int err = 0;
rtnl_lock();
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
if (err < 0)
break;
}
rtnl_unlock();
if (err != -EMSGSIZE)
return err;
return skb->len;
}
static int
netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
const struct genl_info *info)
{
void *hdr;
pid_t pid;
if (WARN_ON_ONCE(!napi->dev))
return -EINVAL;
if (!(napi->dev->flags & IFF_UP))
return 0;
hdr = genlmsg_iput(rsp, info);
if (!hdr)
return -EMSGSIZE;
if (napi->napi_id >= MIN_NAPI_ID &&
nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id))
goto nla_put_failure;
if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
goto nla_put_failure;
if (napi->irq >= 0 && nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq))
goto nla_put_failure;
if (napi->thread) {
pid = task_pid_nr(napi->thread);
if (nla_put_u32(rsp, NETDEV_A_NAPI_PID, pid))
goto nla_put_failure;
}
genlmsg_end(rsp, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(rsp, hdr);
return -EMSGSIZE;
}
int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct napi_struct *napi;
struct sk_buff *rsp;
u32 napi_id;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID))
return -EINVAL;
napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]);
rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!rsp)
return -ENOMEM;
rtnl_lock();
napi = napi_by_id(napi_id);
if (napi)
err = netdev_nl_napi_fill_one(rsp, napi, info);
else
err = -EINVAL;
rtnl_unlock();
if (err)
goto err_free_msg;
return genlmsg_reply(rsp, info);
err_free_msg:
nlmsg_free(rsp);
return err;
}
static int
netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info,
struct netdev_nl_dump_ctx *ctx)
{
struct napi_struct *napi;
int err = 0;
if (!(netdev->flags & IFF_UP))
return err;
list_for_each_entry(napi, &netdev->napi_list, dev_list) {
if (ctx->napi_id && napi->napi_id >= ctx->napi_id)
continue;
err = netdev_nl_napi_fill_one(rsp, napi, info);
if (err)
return err;
ctx->napi_id = napi->napi_id;
}
return err;
}
int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
const struct genl_info *info = genl_info_dump(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
u32 ifindex = 0;
int err = 0;
if (info->attrs[NETDEV_A_NAPI_IFINDEX])
ifindex = nla_get_u32(info->attrs[NETDEV_A_NAPI_IFINDEX]);
rtnl_lock();
if (ifindex) {
netdev = __dev_get_by_index(net, ifindex);
if (netdev)
err = netdev_nl_napi_dump_one(netdev, skb, info, ctx);
else
err = -ENODEV;
} else {
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_napi_dump_one(netdev, skb, info, ctx);
if (err < 0)
break;
ctx->napi_id = 0;
}
}
rtnl_unlock();
if (err != -EMSGSIZE)
return err;
return skb->len;
}
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)
{
struct netdev_rx_queue *rxq;
struct netdev_queue *txq;
void *hdr;
hdr = genlmsg_iput(rsp, info);
if (!hdr)
return -EMSGSIZE;
if (nla_put_u32(rsp, NETDEV_A_QUEUE_ID, q_idx) ||
nla_put_u32(rsp, NETDEV_A_QUEUE_TYPE, q_type) ||
nla_put_u32(rsp, NETDEV_A_QUEUE_IFINDEX, netdev->ifindex))
goto nla_put_failure;
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))
goto nla_put_failure;
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))
goto nla_put_failure;
}
genlmsg_end(rsp, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(rsp, hdr);
return -EMSGSIZE;
}
static int netdev_nl_queue_validate(struct net_device *netdev, u32 q_id,
u32 q_type)
{
switch (q_type) {
case NETDEV_QUEUE_TYPE_RX:
if (q_id >= netdev->real_num_rx_queues)
return -EINVAL;
return 0;
case NETDEV_QUEUE_TYPE_TX:
if (q_id >= netdev->real_num_tx_queues)
return -EINVAL;
}
return 0;
}
static int
netdev_nl_queue_fill(struct sk_buff *rsp, struct net_device *netdev, u32 q_idx,
u32 q_type, const struct genl_info *info)
{
int err = 0;
if (!(netdev->flags & IFF_UP))
return err;
err = netdev_nl_queue_validate(netdev, q_idx, q_type);
if (err)
return err;
return netdev_nl_queue_fill_one(rsp, netdev, q_idx, q_type, info);
}
int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
{
u32 q_id, q_type, ifindex;
struct net_device *netdev;
struct sk_buff *rsp;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_ID) ||
GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_TYPE) ||
GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX))
return -EINVAL;
q_id = nla_get_u32(info->attrs[NETDEV_A_QUEUE_ID]);
q_type = nla_get_u32(info->attrs[NETDEV_A_QUEUE_TYPE]);
ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!rsp)
return -ENOMEM;
rtnl_lock();
netdev = __dev_get_by_index(genl_info_net(info), ifindex);
if (netdev)
err = netdev_nl_queue_fill(rsp, netdev, q_id, q_type, info);
else
err = -ENODEV;
rtnl_unlock();
if (err)
goto err_free_msg;
return genlmsg_reply(rsp, info);
err_free_msg:
nlmsg_free(rsp);
return err;
}
static int
netdev_nl_queue_dump_one(struct net_device *netdev, struct sk_buff *rsp,
const struct genl_info *info,
struct netdev_nl_dump_ctx *ctx)
{
int err = 0;
int i;
if (!(netdev->flags & IFF_UP))
return err;
for (i = ctx->rxq_idx; i < netdev->real_num_rx_queues;) {
err = netdev_nl_queue_fill_one(rsp, netdev, i,
NETDEV_QUEUE_TYPE_RX, info);
if (err)
return err;
ctx->rxq_idx = i++;
}
for (i = ctx->txq_idx; i < netdev->real_num_tx_queues;) {
err = netdev_nl_queue_fill_one(rsp, netdev, i,
NETDEV_QUEUE_TYPE_TX, info);
if (err)
return err;
ctx->txq_idx = i++;
}
return err;
}
int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb);
const struct genl_info *info = genl_info_dump(cb);
struct net *net = sock_net(skb->sk);
struct net_device *netdev;
u32 ifindex = 0;
int err = 0;
if (info->attrs[NETDEV_A_QUEUE_IFINDEX])
ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
rtnl_lock();
if (ifindex) {
netdev = __dev_get_by_index(net, ifindex);
if (netdev)
err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
else
err = -ENODEV;
} else {
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_queue_dump_one(netdev, skb, info, ctx);
if (err < 0)
break;
ctx->rxq_idx = 0;
ctx->txq_idx = 0;
}
}
rtnl_unlock();
if (err != -EMSGSIZE)
return err;
return skb->len;
}
static int netdev_genl_netdevice_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
switch (event) {
case NETDEV_REGISTER:
netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_ADD_NTF);
break;
case NETDEV_UNREGISTER:
netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_DEL_NTF);
break;
case NETDEV_XDP_FEAT_CHANGE:
netdev_genl_dev_notify(netdev, NETDEV_CMD_DEV_CHANGE_NTF);
break;
}
return NOTIFY_OK;
}
static struct notifier_block netdev_genl_nb = {
.notifier_call = netdev_genl_netdevice_event,
};
static int __init netdev_genl_init(void)
{
int err;
err = register_netdevice_notifier(&netdev_genl_nb);
if (err)
return err;
err = genl_register_family(&netdev_nl_family);
if (err)
goto err_unreg_ntf;
return 0;
err_unreg_ntf:
unregister_netdevice_notifier(&netdev_genl_nb);
return err;
}
subsys_initcall(netdev_genl_init);
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