From e817f85652c14d78f170b18797e4c477c78949e0 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Wed, 3 Jan 2018 11:26:09 +0100 Subject: [PATCH] xdp: generic XDP handling of xdp_rxq_info Hook points for xdp_rxq_info: * reg : netif_alloc_rx_queues * unreg: netif_free_rx_queues The net_device have some members (num_rx_queues + real_num_rx_queues) and data-area (dev->_rx with struct netdev_rx_queue's) that were primarily used for exporting information about RPS (CONFIG_RPS) queues to sysfs (CONFIG_SYSFS). For generic XDP extend struct netdev_rx_queue with the xdp_rxq_info, and remove some of the CONFIG_SYSFS ifdefs. Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov --- include/linux/netdevice.h | 2 ++ net/core/dev.c | 69 +++++++++++++++++++++++++++++++++------ 2 files changed, 61 insertions(+), 10 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 49bfc6eec74c..440b000f07f4 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -44,6 +44,7 @@ #include #endif #include +#include #include #include @@ -686,6 +687,7 @@ struct netdev_rx_queue { #endif struct kobject kobj; struct net_device *dev; + struct xdp_rxq_info xdp_rxq; } ____cacheline_aligned_in_smp; /* diff --git a/net/core/dev.c b/net/core/dev.c index 2eb66c0d9cdb..d7925ef8743d 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3906,9 +3906,33 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu, return NET_RX_DROP; } +static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + struct netdev_rx_queue *rxqueue; + + rxqueue = dev->_rx; + + if (skb_rx_queue_recorded(skb)) { + u16 index = skb_get_rx_queue(skb); + + if (unlikely(index >= dev->real_num_rx_queues)) { + WARN_ONCE(dev->real_num_rx_queues > 1, + "%s received packet on queue %u, but number " + "of RX queues is %u\n", + dev->name, index, dev->real_num_rx_queues); + + return rxqueue; /* Return first rxqueue */ + } + rxqueue += index; + } + return rxqueue; +} + static u32 netif_receive_generic_xdp(struct sk_buff *skb, struct bpf_prog *xdp_prog) { + struct netdev_rx_queue *rxqueue; u32 metalen, act = XDP_DROP; struct xdp_buff xdp; void *orig_data; @@ -3952,6 +3976,9 @@ static u32 netif_receive_generic_xdp(struct sk_buff *skb, xdp.data_hard_start = skb->data - skb_headroom(skb); orig_data = xdp.data; + rxqueue = netif_get_rxqueue(skb); + xdp.rxq = &rxqueue->xdp_rxq; + act = bpf_prog_run_xdp(xdp_prog, &xdp); off = xdp.data - orig_data; @@ -7589,12 +7616,12 @@ void netif_stacked_transfer_operstate(const struct net_device *rootdev, } EXPORT_SYMBOL(netif_stacked_transfer_operstate); -#ifdef CONFIG_SYSFS static int netif_alloc_rx_queues(struct net_device *dev) { unsigned int i, count = dev->num_rx_queues; struct netdev_rx_queue *rx; size_t sz = count * sizeof(*rx); + int err = 0; BUG_ON(count < 1); @@ -7604,11 +7631,39 @@ static int netif_alloc_rx_queues(struct net_device *dev) dev->_rx = rx; - for (i = 0; i < count; i++) + for (i = 0; i < count; i++) { rx[i].dev = dev; + + /* XDP RX-queue setup */ + err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i); + if (err < 0) + goto err_rxq_info; + } return 0; + +err_rxq_info: + /* Rollback successful reg's and free other resources */ + while (i--) + xdp_rxq_info_unreg(&rx[i].xdp_rxq); + kfree(dev->_rx); + dev->_rx = NULL; + return err; +} + +static void netif_free_rx_queues(struct net_device *dev) +{ + unsigned int i, count = dev->num_rx_queues; + struct netdev_rx_queue *rx; + + /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ + if (!dev->_rx) + return; + + rx = dev->_rx; + + for (i = 0; i < count; i++) + xdp_rxq_info_unreg(&rx[i].xdp_rxq); } -#endif static void netdev_init_one_queue(struct net_device *dev, struct netdev_queue *queue, void *_unused) @@ -8169,12 +8224,10 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, return NULL; } -#ifdef CONFIG_SYSFS if (rxqs < 1) { pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); return NULL; } -#endif alloc_size = sizeof(struct net_device); if (sizeof_priv) { @@ -8231,12 +8284,10 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, if (netif_alloc_netdev_queues(dev)) goto free_all; -#ifdef CONFIG_SYSFS dev->num_rx_queues = rxqs; dev->real_num_rx_queues = rxqs; if (netif_alloc_rx_queues(dev)) goto free_all; -#endif strcpy(dev->name, name); dev->name_assign_type = name_assign_type; @@ -8275,9 +8326,7 @@ void free_netdev(struct net_device *dev) might_sleep(); netif_free_tx_queues(dev); -#ifdef CONFIG_SYSFS - kvfree(dev->_rx); -#endif + netif_free_rx_queues(dev); kfree(rcu_dereference_protected(dev->ingress_queue, 1)); -- GitLab