Commit 262b7f14 authored by stephen hemminger's avatar stephen hemminger Committed by David S. Miller
Browse files

netvsc: add comments about callback's and NAPI 



Add some short description of how callback's and NAPI interoperate.

Signed-off-by: default avatarStephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6de38af6

drivers/net/hyperv/netvsc.c

+12 −1
Original line number Diff line number Diff line
@@ -1209,6 +1209,10 @@ static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) 
	return primary ? primary->device_obj : channel->device_obj;

}



/* Network processing softirq

 * Process data in incoming ring buffer from host

 * Stops when ring is empty or budget is met or exceeded.

 */

int netvsc_poll(struct napi_struct *napi, int budget)

{

	struct netvsc_channel *nvchan
@@ -1238,7 +1242,11 @@ int netvsc_poll(struct napi_struct *napi, int budget) 
	}

	hv_pkt_iter_close(channel);



	/* If ring is empty and NAPI is not doing polling */

	/* If budget was not exhausted and

	 * not doing busy poll

	 * then re-enable host interrupts

	 *  and reschedule if ring is not empty.

	 */

	if (work_done < budget &&

	    napi_complete_done(napi, work_done) &&

	    hv_end_read(&channel->inbound) != 0)
@@ -1248,6 +1256,9 @@ int netvsc_poll(struct napi_struct *napi, int budget) 
	return work_done;

}



/* Call back when data is available in host ring buffer.

 * Processing is deferred until network softirq (NAPI)

 */

void netvsc_channel_cb(void *context)

{

	struct netvsc_channel *nvchan = context;