Re: [PATCH v2] net/cadence_gem: Updating the GEM MAC IP to properly filter out multicast addresses.

[Bilal Wasim <bilalwasim676@gmail.com>]

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Thanks, Will do..

On Fri, 29 Nov 2019, 14:13 Edgar E. Iglesias, <edgar.iglesias@gmail.com>
wrote:

> On Fri, Nov 29, 2019 at 01:52:16PM +0500, bilalwasim676@gmail.com wrote:
> > From: bwasim <bilal_wasim@mentor.com>
> >
> > The current code makes a bad assumption that the most-significant byte
> > of the MAC address is used to determine if the address is multicast or
> > unicast, but in reality only a single bit is used to determine this.
> > This caused IPv6 to not work.. Fix is now in place and has been tested
> > with ZCU102-A53 / IPv6 on a TAP interface. Works well..
>
> Thanks Bilal,
>
> Sorry, just one more thing I had missed, we need to update
> gem_transmit_updatestats() aswell, in a similar way as we did with
> gem_receive_updatestats().
>
> Cheers,
> Edgar
>
>
> >
> > Signed-off-by: Bilal Wasim <bilal_wasim@mentor.com>
> > ---
> >  hw/net/cadence_gem.c | 19 ++++++++++++-------
> >  1 file changed, 12 insertions(+), 7 deletions(-)
> >
> > diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
> > index b8be73dc55..042188c1ba 100644
> > --- a/hw/net/cadence_gem.c
> > +++ b/hw/net/cadence_gem.c
> > @@ -34,6 +34,7 @@
> >  #include "qemu/module.h"
> >  #include "sysemu/dma.h"
> >  #include "net/checksum.h"
> > +#include "net/eth.h"
> >
> >  #ifdef CADENCE_GEM_ERR_DEBUG
> >  #define DB_PRINT(...) do { \
> > @@ -601,7 +602,7 @@ static void gem_receive_updatestats(CadenceGEMState
> *s, const uint8_t *packet,
> >      }
> >
> >      /* Error-free Multicast Frames counter */
> > -    if (packet[0] == 0x01) {
> > +    if (is_multicast_ether_addr(packet)) {
> >          s->regs[GEM_RXMULTICNT]++;
> >      }
> >
> > @@ -690,21 +691,25 @@ static int gem_mac_address_filter(CadenceGEMState
> *s, const uint8_t *packet)
> >      }
> >
> >      /* Accept packets -w- hash match? */
> > -    if ((packet[0] == 0x01 && (s->regs[GEM_NWCFG] &
> GEM_NWCFG_MCAST_HASH)) ||
> > -        (packet[0] != 0x01 && (s->regs[GEM_NWCFG] &
> GEM_NWCFG_UCAST_HASH))) {
> > +    if ((is_multicast_ether_addr(packet)
> > +        && (s->regs[GEM_NWCFG] & GEM_NWCFG_MCAST_HASH)) ||
> > +        (is_unicast_ether_addr(packet)
> > +        && (s->regs[GEM_NWCFG] & GEM_NWCFG_UCAST_HASH))) {
> >          unsigned hash_index;
> >
> >          hash_index = calc_mac_hash(packet);
> >          if (hash_index < 32) {
> >              if (s->regs[GEM_HASHLO] & (1<<hash_index)) {
> > -                return packet[0] == 0x01 ? GEM_RX_MULTICAST_HASH_ACCEPT
> :
> > -                                           GEM_RX_UNICAST_HASH_ACCEPT;
> > +                return is_multicast_ether_addr(packet) ?
> > +                       GEM_RX_MULTICAST_HASH_ACCEPT :
> > +                       GEM_RX_UNICAST_HASH_ACCEPT;
> >              }
> >          } else {
> >              hash_index -= 32;
> >              if (s->regs[GEM_HASHHI] & (1<<hash_index)) {
> > -                return packet[0] == 0x01 ? GEM_RX_MULTICAST_HASH_ACCEPT
> :
> > -                                           GEM_RX_UNICAST_HASH_ACCEPT;
> > +                return is_multicast_ether_addr(packet) ?
> > +                       GEM_RX_MULTICAST_HASH_ACCEPT :
> > +                       GEM_RX_UNICAST_HASH_ACCEPT;
> >              }
> >          }
> >      }
> > --
> > 2.19.1.windows.1
> >
>

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