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netdevsim: add NAPI support
Add NAPI support to netdevim, similar to veth. * Add a nsim_rq rx queue structure to hold a NAPI instance and a skb queue. * During xmit, store the skb in the peer skb queue and schedule NAPI. * During napi_poll(), drain the skb queue and pass up the stack. * Add assoc between rxq and NAPI instance using netif_queue_set_napi(). Signed-off-by: David Wei <dw@davidwei.uk> Link: https://lore.kernel.org/r/20240507163228.2066817-2-dw@davidwei.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
David Wei
Jakub Kicinski
parent
1d0dc857b5
commit
3762ec05a9
2 changed files with 205 additions and 12 deletions
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@ -28,11 +28,33 @@
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#include "netdevsim.h"
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#define NSIM_RING_SIZE 256
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static int nsim_napi_rx(struct nsim_rq *rq, struct sk_buff *skb)
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{
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if (skb_queue_len(&rq->skb_queue) > NSIM_RING_SIZE) {
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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}
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skb_queue_tail(&rq->skb_queue, skb);
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return NET_RX_SUCCESS;
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}
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static int nsim_forward_skb(struct net_device *dev, struct sk_buff *skb,
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struct nsim_rq *rq)
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{
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return __dev_forward_skb(dev, skb) ?: nsim_napi_rx(rq, skb);
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}
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static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct netdevsim *ns = netdev_priv(dev);
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struct net_device *peer_dev;
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unsigned int len = skb->len;
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struct netdevsim *peer_ns;
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struct nsim_rq *rq;
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int rxq;
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rcu_read_lock();
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if (!nsim_ipsec_tx(ns, skb))
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@ -42,10 +64,18 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
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if (!peer_ns)
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goto out_drop_free;
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peer_dev = peer_ns->netdev;
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rxq = skb_get_queue_mapping(skb);
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if (rxq >= peer_dev->num_rx_queues)
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rxq = rxq % peer_dev->num_rx_queues;
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rq = &peer_ns->rq[rxq];
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skb_tx_timestamp(skb);
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if (unlikely(dev_forward_skb(peer_ns->netdev, skb) == NET_RX_DROP))
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if (unlikely(nsim_forward_skb(peer_dev, skb, rq) == NET_RX_DROP))
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goto out_drop_cnt;
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napi_schedule(&rq->napi);
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rcu_read_unlock();
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u64_stats_update_begin(&ns->syncp);
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ns->tx_packets++;
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@ -300,25 +330,146 @@ static int nsim_get_iflink(const struct net_device *dev)
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return iflink;
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}
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static int nsim_rcv(struct nsim_rq *rq, int budget)
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{
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struct sk_buff *skb;
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int i;
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for (i = 0; i < budget; i++) {
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if (skb_queue_empty(&rq->skb_queue))
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break;
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skb = skb_dequeue(&rq->skb_queue);
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netif_receive_skb(skb);
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}
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return i;
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}
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static int nsim_poll(struct napi_struct *napi, int budget)
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{
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struct nsim_rq *rq = container_of(napi, struct nsim_rq, napi);
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int done;
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done = nsim_rcv(rq, budget);
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napi_complete(napi);
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return done;
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}
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static int nsim_create_page_pool(struct nsim_rq *rq)
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{
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struct page_pool_params p = {
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.order = 0,
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.pool_size = NSIM_RING_SIZE,
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.nid = NUMA_NO_NODE,
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.dev = &rq->napi.dev->dev,
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.napi = &rq->napi,
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.dma_dir = DMA_BIDIRECTIONAL,
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.netdev = rq->napi.dev,
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};
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rq->page_pool = page_pool_create(&p);
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if (IS_ERR(rq->page_pool)) {
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int err = PTR_ERR(rq->page_pool);
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rq->page_pool = NULL;
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return err;
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}
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return 0;
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}
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static int nsim_init_napi(struct netdevsim *ns)
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{
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struct net_device *dev = ns->netdev;
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struct nsim_rq *rq;
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int err, i;
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for (i = 0; i < dev->num_rx_queues; i++) {
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rq = &ns->rq[i];
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netif_napi_add(dev, &rq->napi, nsim_poll);
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}
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for (i = 0; i < dev->num_rx_queues; i++) {
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rq = &ns->rq[i];
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err = nsim_create_page_pool(rq);
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if (err)
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goto err_pp_destroy;
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}
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return 0;
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err_pp_destroy:
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while (i--) {
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page_pool_destroy(ns->rq[i].page_pool);
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ns->rq[i].page_pool = NULL;
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}
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for (i = 0; i < dev->num_rx_queues; i++)
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__netif_napi_del(&ns->rq[i].napi);
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return err;
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}
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static void nsim_enable_napi(struct netdevsim *ns)
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{
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struct net_device *dev = ns->netdev;
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int i;
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for (i = 0; i < dev->num_rx_queues; i++) {
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struct nsim_rq *rq = &ns->rq[i];
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netif_queue_set_napi(dev, i, NETDEV_QUEUE_TYPE_RX, &rq->napi);
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napi_enable(&rq->napi);
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}
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}
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static int nsim_open(struct net_device *dev)
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{
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struct netdevsim *ns = netdev_priv(dev);
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struct page_pool_params pp = { 0 };
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int err;
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pp.pool_size = 128;
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pp.dev = &dev->dev;
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pp.dma_dir = DMA_BIDIRECTIONAL;
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pp.netdev = dev;
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err = nsim_init_napi(ns);
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if (err)
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return err;
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ns->pp = page_pool_create(&pp);
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return PTR_ERR_OR_ZERO(ns->pp);
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nsim_enable_napi(ns);
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return 0;
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}
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static void nsim_del_napi(struct netdevsim *ns)
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{
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struct net_device *dev = ns->netdev;
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int i;
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for (i = 0; i < dev->num_rx_queues; i++) {
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struct nsim_rq *rq = &ns->rq[i];
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napi_disable(&rq->napi);
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__netif_napi_del(&rq->napi);
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}
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synchronize_net();
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for (i = 0; i < dev->num_rx_queues; i++) {
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page_pool_destroy(ns->rq[i].page_pool);
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ns->rq[i].page_pool = NULL;
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}
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}
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static int nsim_stop(struct net_device *dev)
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{
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struct netdevsim *ns = netdev_priv(dev);
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struct netdevsim *peer;
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page_pool_destroy(ns->pp);
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netif_carrier_off(dev);
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peer = rtnl_dereference(ns->peer);
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if (peer)
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netif_carrier_off(peer->netdev);
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nsim_del_napi(ns);
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return 0;
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}
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@ -437,7 +588,7 @@ nsim_pp_hold_write(struct file *file, const char __user *data,
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if (!netif_running(ns->netdev) && val) {
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ret = -ENETDOWN;
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} else if (val) {
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ns->page = page_pool_dev_alloc_pages(ns->pp);
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ns->page = page_pool_dev_alloc_pages(ns->rq[0].page_pool);
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if (!ns->page)
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ret = -ENOMEM;
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} else {
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@ -477,6 +628,35 @@ static void nsim_setup(struct net_device *dev)
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dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD;
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}
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static int nsim_queue_init(struct netdevsim *ns)
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{
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struct net_device *dev = ns->netdev;
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int i;
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ns->rq = kvcalloc(dev->num_rx_queues, sizeof(*ns->rq),
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GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
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if (!ns->rq)
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return -ENOMEM;
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for (i = 0; i < dev->num_rx_queues; i++)
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skb_queue_head_init(&ns->rq[i].skb_queue);
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return 0;
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}
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static void nsim_queue_free(struct netdevsim *ns)
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{
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struct net_device *dev = ns->netdev;
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int i;
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for (i = 0; i < dev->num_rx_queues; i++)
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skb_queue_purge_reason(&ns->rq[i].skb_queue,
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SKB_DROP_REASON_QUEUE_PURGE);
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kvfree(ns->rq);
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ns->rq = NULL;
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}
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static int nsim_init_netdevsim(struct netdevsim *ns)
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{
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struct mock_phc *phc;
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@ -495,10 +675,14 @@ static int nsim_init_netdevsim(struct netdevsim *ns)
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goto err_phc_destroy;
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rtnl_lock();
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err = nsim_bpf_init(ns);
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err = nsim_queue_init(ns);
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if (err)
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goto err_utn_destroy;
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err = nsim_bpf_init(ns);
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if (err)
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goto err_rq_destroy;
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nsim_macsec_init(ns);
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nsim_ipsec_init(ns);
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@ -512,6 +696,8 @@ static int nsim_init_netdevsim(struct netdevsim *ns)
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nsim_ipsec_teardown(ns);
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nsim_macsec_teardown(ns);
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nsim_bpf_uninit(ns);
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err_rq_destroy:
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nsim_queue_free(ns);
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err_utn_destroy:
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rtnl_unlock();
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nsim_udp_tunnels_info_destroy(ns->netdev);
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@ -593,6 +779,7 @@ void nsim_destroy(struct netdevsim *ns)
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nsim_macsec_teardown(ns);
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nsim_ipsec_teardown(ns);
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nsim_bpf_uninit(ns);
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nsim_queue_free(ns);
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}
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rtnl_unlock();
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if (nsim_dev_port_is_pf(ns->nsim_dev_port))
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@ -90,11 +90,18 @@ struct nsim_ethtool {
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struct ethtool_fecparam fec;
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};
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struct nsim_rq {
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struct napi_struct napi;
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struct sk_buff_head skb_queue;
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struct page_pool *page_pool;
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};
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struct netdevsim {
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struct net_device *netdev;
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struct nsim_dev *nsim_dev;
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struct nsim_dev_port *nsim_dev_port;
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struct mock_phc *phc;
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struct nsim_rq *rq;
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u64 tx_packets;
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u64 tx_bytes;
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@ -125,7 +132,6 @@ struct netdevsim {
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struct debugfs_u32_array dfs_ports[2];
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} udp_ports;
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struct page_pool *pp;
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struct page *page;
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struct dentry *pp_dfs;
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