I'm implementing a new network driver. In reading other drivers and
the documentation, I'm finding that there is a new (-er) interface
that is recommended.
The target is an embedded MAC of an ARM7 CPU with an integrated DMA
controller.
1) Is there any reason not mentioned in the HOWTO for not
implementing NAPI?
2) I've read that it is a bad idea to hang-on to SKBs. With DMA
this CPU can eliminate the packet copying, but that means that
the receive queue will have SKBs laying around. Is this
acceptable?
3) In the prerequisites (from the HOWTO)
B) Ability to turn off interrupts or maybe events that send
packets up the stack.
What does this sentence mean?
4) I'm presently DMAing into an SKB. While there are other
problems that challeng the driver, it looks like buffers are
not being properly received by netif.
Here's what I'm doing when a packet comes in:
struct sk_buff* skb = emac->rg_rx_skb[emac->head_rx];
size_t packet_len = emac->rg_rx_descriptor[emac->head_rx *2+1] & 0x7ff;
net_d->last_rx = jiffies;
skb->protocol = eth_type_trans (skb, net_d);
skb_put (skb, packet_len);
PRINT_PKT (skb->data, packet_len > 64 ? 64 : packet_len);
netif_rx (skb);
I've not found a good example. Is this right using the old interface?
Cheers.
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