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| author | Dan Williams <dan.j.williams@intel.com> | 2009-01-06 11:38:15 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-01-06 11:38:15 -0700 |
| commit | f67b45999205164958de4ec0658d51fa4bee066d (patch) | |
| tree | 2fc3c2e833fdfea2f029dca05d5401ba9ae63229 /net/core | |
| parent | 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 (diff) | |
| download | lwn-f67b45999205164958de4ec0658d51fa4bee066d.tar.gz lwn-f67b45999205164958de4ec0658d51fa4bee066d.zip | |
net_dma: convert to dma_find_channel
Use the general-purpose channel allocation provided by dmaengine.
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index e40b0d57f8ff..bbb07dbe1740 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4828,44 +4828,6 @@ static int dev_cpu_callback(struct notifier_block *nfb, #ifdef CONFIG_NET_DMA /** - * net_dma_rebalance - try to maintain one DMA channel per CPU - * @net_dma: DMA client and associated data (lock, channels, channel_mask) - * - * This is called when the number of channels allocated to the net_dma client - * changes. The net_dma client tries to have one DMA channel per CPU. - */ - -static void net_dma_rebalance(struct net_dma *net_dma) -{ - unsigned int cpu, i, n, chan_idx; - struct dma_chan *chan; - - if (cpus_empty(net_dma->channel_mask)) { - for_each_online_cpu(cpu) - rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL); - return; - } - - i = 0; - cpu = first_cpu(cpu_online_map); - - for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) { - chan = net_dma->channels[chan_idx]; - - n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask)) - + (i < (num_online_cpus() % - cpus_weight(net_dma->channel_mask)) ? 1 : 0)); - - while(n) { - per_cpu(softnet_data, cpu).net_dma = chan; - cpu = next_cpu(cpu, cpu_online_map); - n--; - } - i++; - } -} - -/** * netdev_dma_event - event callback for the net_dma_client * @client: should always be net_dma_client * @chan: DMA channel for the event @@ -4894,7 +4856,6 @@ netdev_dma_event(struct dma_client *client, struct dma_chan *chan, ack = DMA_ACK; net_dma->channels[pos] = chan; cpu_set(pos, net_dma->channel_mask); - net_dma_rebalance(net_dma); } break; case DMA_RESOURCE_REMOVED: @@ -4909,7 +4870,6 @@ netdev_dma_event(struct dma_client *client, struct dma_chan *chan, ack = DMA_ACK; cpu_clear(pos, net_dma->channel_mask); net_dma->channels[i] = NULL; - net_dma_rebalance(net_dma); } break; default: |