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netdev-genl: Add netlink framework functions for queue

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Implement the netdev netlink framework functions for
exposing queue information.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Link: https://lore.kernel.org/r/170147332603.5260.7982559672617639065.stgit@anambiarhost.jf.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Amritha Nambiar 2023-12-01 15:28:46 -08:00 committed by Jakub Kicinski
parent 91fdbce7e8
commit 6b6171db7f
1 changed files with 184 additions and 3 deletions
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187
net/core/netdev-genl.c
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@ -7,9 +7,23 @@
#include <net/sock.h>
#include <net/xdp.h>
#include <net/xdp_sock.h>
#include <net/netdev_rx_queue.h>
#include "netdev-genl-gen.h"
struct netdev_nl_dump_ctx {
unsigned long ifindex;
unsigned int rxq_idx;
unsigned int txq_idx;
};
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)
@ -122,12 +136,13 @@ int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info)
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, cb->args[0]) {
for_each_netdev_dump(net, netdev, ctx->ifindex) {
err = netdev_nl_dev_fill(netdev, skb, genl_info_dump(cb));
if (err < 0)
break;
@ -140,14 +155,180 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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)
{
return -EOPNOTSUPP;
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)
{
return -EOPNOTSUPP;
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,