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netvsc: add comments about callback's and NAPI
Add some short description of how callback's and NAPI interoperate. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 12 additions and 1 deletions
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@ -1209,6 +1209,10 @@ static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
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return primary ? primary->device_obj : channel->device_obj;
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}
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/* Network processing softirq
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* Process data in incoming ring buffer from host
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* Stops when ring is empty or budget is met or exceeded.
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*/
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int netvsc_poll(struct napi_struct *napi, int budget)
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{
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struct netvsc_channel *nvchan
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@ -1238,7 +1242,11 @@ int netvsc_poll(struct napi_struct *napi, int budget)
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}
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hv_pkt_iter_close(channel);
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/* If ring is empty and NAPI is not doing polling */
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/* If budget was not exhausted and
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* not doing busy poll
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* then re-enable host interrupts
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* and reschedule if ring is not empty.
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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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hv_end_read(&channel->inbound) != 0)
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@ -1248,6 +1256,9 @@ int netvsc_poll(struct napi_struct *napi, int budget)
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return work_done;
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}
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/* Call back when data is available in host ring buffer.
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* Processing is deferred until network softirq (NAPI)
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*/
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void netvsc_channel_cb(void *context)
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{
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struct netvsc_channel *nvchan = context;
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