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113 lines
2.3 KiB
113 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <linux/netdevice.h> |
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#include <net/gro_cells.h> |
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struct gro_cell { |
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struct sk_buff_head napi_skbs; |
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struct napi_struct napi; |
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}; |
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int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb) |
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{ |
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struct net_device *dev = skb->dev; |
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struct gro_cell *cell; |
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int res; |
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rcu_read_lock(); |
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if (unlikely(!(dev->flags & IFF_UP))) |
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goto drop; |
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if (!gcells->cells || skb_cloned(skb) || netif_elide_gro(dev)) { |
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res = netif_rx(skb); |
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goto unlock; |
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} |
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cell = this_cpu_ptr(gcells->cells); |
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if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) { |
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drop: |
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atomic_long_inc(&dev->rx_dropped); |
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kfree_skb(skb); |
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res = NET_RX_DROP; |
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goto unlock; |
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} |
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__skb_queue_tail(&cell->napi_skbs, skb); |
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if (skb_queue_len(&cell->napi_skbs) == 1) |
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napi_schedule(&cell->napi); |
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res = NET_RX_SUCCESS; |
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unlock: |
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rcu_read_unlock(); |
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return res; |
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} |
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EXPORT_SYMBOL(gro_cells_receive); |
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/* called under BH context */ |
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static int gro_cell_poll(struct napi_struct *napi, int budget) |
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{ |
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struct gro_cell *cell = container_of(napi, struct gro_cell, napi); |
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struct sk_buff *skb; |
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int work_done = 0; |
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while (work_done < budget) { |
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skb = __skb_dequeue(&cell->napi_skbs); |
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if (!skb) |
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break; |
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napi_gro_receive(napi, skb); |
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work_done++; |
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} |
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if (work_done < budget) |
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napi_complete_done(napi, work_done); |
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return work_done; |
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} |
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int gro_cells_init(struct gro_cells *gcells, struct net_device *dev) |
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{ |
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int i; |
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gcells->cells = alloc_percpu(struct gro_cell); |
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if (!gcells->cells) |
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return -ENOMEM; |
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for_each_possible_cpu(i) { |
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struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); |
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__skb_queue_head_init(&cell->napi_skbs); |
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set_bit(NAPI_STATE_NO_BUSY_POLL, &cell->napi.state); |
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netif_napi_add(dev, &cell->napi, gro_cell_poll, |
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NAPI_POLL_WEIGHT); |
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napi_enable(&cell->napi); |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL(gro_cells_init); |
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void gro_cells_destroy(struct gro_cells *gcells) |
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{ |
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int i; |
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if (!gcells->cells) |
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return; |
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for_each_possible_cpu(i) { |
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struct gro_cell *cell = per_cpu_ptr(gcells->cells, i); |
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napi_disable(&cell->napi); |
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__netif_napi_del(&cell->napi); |
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__skb_queue_purge(&cell->napi_skbs); |
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} |
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/* This barrier is needed because netpoll could access dev->napi_list |
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* under rcu protection. |
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*/ |
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synchronize_net(); |
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free_percpu(gcells->cells); |
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gcells->cells = NULL; |
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} |
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EXPORT_SYMBOL(gro_cells_destroy);
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