Date: Wed, 17 Oct 2012 13:33:05 -0400 From: Ming Fu <ming.fu@netsweeper.com> To: freebsd-net@freebsd.org Subject: Re: netmap NETMAP_SW_RING or NETMAP_HW_RING Message-ID: <507EEBD1.3020703@netsweeper.com> In-Reply-To: <507EDFCE.3060702@netsweeper.com> References: <507EDFCE.3060702@netsweeper.com>
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After a second look at the netmap_open code, I believe the
NETMAP_HW_RING is the choice.
My next trouble to to receive packets.
The program spins off 8 threads, each thread try to bind to one of the
queue on an igb card. (queue 0-7).
depending on how I call the netmap_open().
if I call
netmap_open(&me, id /*| NETMAP_HW_RING */, 1);
The program will able to receive packets, but of course each thread
receives packet from all 8 queues.
If I call
netmap_open(&me, id | NETMAP_HW_RING , 1)
none of the thread was able to receive packet.
come across the following line of code in nm_util.c
} else if (ringid & NETMAP_HW_RING) {
D("XXX check multiple threads");
What does it suggest? any special requirement for multi-threaded program?
Regards,
Ming
On 10/17/2012 12:41 PM, Ming Fu wrote:
> Hi,
>
> What is the difference between NETMAP_SW_RING and NETMAP_HW_RING.
> When using netmap_open() in the example code to create a netmap fdesc,
> one of these two need to be ORed to the queue ID, in order to bind
> only one RX queue.
>
> netmap code updated from FreeBSD RELENG_9.
>
> Regards,
> Ming
>
>
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