Date: Fri, 23 Aug 2013 22:57:03 -0400 From: Harika Tandra <htandra@gloriad.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Netmap ixgbe stripping Vlan tags Message-ID: <15C5C18A-9EA9-41CE-9547-C630E15CB247@gloriad.org> In-Reply-To: <CA%2BhQ2%2BhVOhoQQFG5MOYa%2B0kSEet7qk1FRmqqiWU%2B7t22CtKa7A@mail.gmail.com> References: <FC9BCAD9-5D16-4E70-A9C5-FA9D9A22B84C@gloriad.org> <CA%2BhQ2%2BhVOhoQQFG5MOYa%2B0kSEet7qk1FRmqqiWU%2B7t22CtKa7A@mail.gmail.com>
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Hi Luigi,
Thank you so much for the reply. It makes it clear that Netmap=20
doesn't change vlanhwfilter option or any other option set on the card.
It is very good news for my application !!
Currently I have the "vlanhwfilter" option disabled on the NIC. But not =
seeing=20
the vlan tags when opened in netmap mode. This is from my /etc/rc.conf =
file :
ifconfig_ix0=3D"inet 192.168.10.10 netmask 255.255.255.0 -vlanhwfilter "=20=
Perhaps I am making a mistake when opening the device in netmap mode.
Do I need to set the flags separately via ioctl call when opening =
interface in netmap=20
mode ? I would appreciate any pointers on this.=20
I am following the pkt-gen example and this is the code I am using to =
open=20
the interface :
int fd =3D open("/dev/netmap", O_RDWR);
if( fd =3D=3D -1) {
ArgusLog(LOG_ERR,"Error : Cannot open netmap device");
=20
} else {
struct nmreq tnmr;
void *mmap_addr;
struct netmap_if *tnifp;
struct NetMapArgs *targs =3D NULL;
bzero(&tnmr, sizeof(tnmr));
tnmr.nr_version =3D NETMAP_API;
strncpy(tnmr.nr_name, device->name, sizeof(tnmr.nr_name));
if ((ioctl(fd, NIOCGINFO, &tnmr)) =3D=3D -1) {
ArgusDebug(4,"Unable to get if info for %s", =
device->name);
}else{
mmap_addr =3D (struct netmap_d *) mmap(0, =
tnmr.nr_memsize,
PROT_WRITE | PROT_READ,
MAP_SHARED, fd, 0);
if (mmap_addr !=3D MAP_FAILED) {
if (ioctl(fd, NIOCREGIF, &tnmr) =3D=3D -1) {
ArgusDebug(4,"Unable to register =
interface %s", tnmr.nr_name);
} else {
tnifp =3D NETMAP_IF(mmap_addr, tnmr.nr_offset);
targs =3D (struct NetMapArgs *)ArgusCalloc(1, =
sizeof(*targs));
targs->nmr =3D tnmr;
targs->fd =3D fd;
targs->nifp =3D tnifp;
inf->nmargs =3D targs;
}
}
Thanks,
Harika.
On Aug 23, 2013, at 9:11 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
> responding to the first email in the thread:
>=20
> netmap by design does not modify the setting of the card
> (vlan, hwcsum, tso/lro, promisc, ...).
>=20
> The main practical reasons behind this choice are that
> i) in many cases both settings make sense when in netmap mode,
> ii) we can use existing OS tools/ioctl to modify the settings
> without having to replicate them within the netmap code.
>=20
> vlan tag insertion/removal is probably the one feature which
> should be always disabled in netmap mode. For others, the case
> is not so clear.
>=20
> As an example, having tso and hwcsum enabled is useful
> to postpone those expensive ops to the very last moment;
> the upcoming version of netmap supports scatter-gather I/O,
> and when used to interconnect virtual machines through
> the VALE switch you don't even need to do the segmentation
> or checksumming.
>=20
> cheers
> luigi
>=20
>=20
>=20
> On Fri, Aug 23, 2013 at 12:36 AM, Harika Tandra <htandra@gloriad.org> =
wrote:
> Hi all,
>=20
> I am running Netmap with "intel 10G 82598EB" card in promiscuous mode.
> While capturing packets via Netmap the driver is stripping off Vlan =
tags.
> I tested my setup, I am able to see Vlan tags when the same card is in =
promiscuous
> mode without Netmap.
>=20
> This maybe due to the netmap related changes to the device driver =
code.
> But I don't know much about drivers. I would appreciate any help or =
pointer
> regarding this.
>=20
> Thanks,
> Htandra.
>=20
>=20
>=20
>=20
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> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
>=20
>=20
>=20
> --=20
> =
-----------------------------------------+-------------------------------
> Prof. Luigi RIZZO, rizzo@iet.unipi.it . Dip. di Ing. =
dell'Informazione
> http://www.iet.unipi.it/~luigi/ . Universita` di Pisa
> TEL +39-050-2211611 . via Diotisalvi 2
> Mobile +39-338-6809875 . 56122 PISA (Italy)
> =
-----------------------------------------+-------------------------------
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