<p>Currently, if the snp driver for whatever reason fails to enable receive filters<br>
for multicast frames, it falls back to enabling just unicast and broadcast<br>
filters. This breaks some IPv6 functionality as the network card does not<br>
respond to neighbour solicitation requests.</p>
<p>Some cards refuse to enable EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST filter, but<br>
support enabling EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST, so try it<br>
before falling back to just unicast+broadcast.</p>
<p>Additionally, according to UEFI specification 2.8 p 24.1 we must set<br>
EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST bit in the "Disable" mask, when<br>
"ResetMCastFilter" is TRUE.</p>
<p>Signed-off-by: Ignat Korchagin <a href="mailto:ignat@cloudflare.com">ignat@cloudflare.com</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/ipxe/ipxe/pull/99'>https://github.com/ipxe/ipxe/pull/99</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>[snp] try to enable promiscuous multicast receive filter if the regular one fails</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/ipxe/ipxe/pull/99/files#diff-0">src/drivers/net/efi/snpnet.c</a>
    (5)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/ipxe/ipxe/pull/99.patch'>https://github.com/ipxe/ipxe/pull/99.patch</a></li>
  <li><a href='https://github.com/ipxe/ipxe/pull/99.diff'>https://github.com/ipxe/ipxe/pull/99.diff</a></li>
</ul>

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