Always use same IP address for module and modex #5938
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Today, a btl tcp module is associated with exactly one IP address (IPv4 or IPv6). There's no need to reserve space for both an IPv4 and IPv6 address in the module structure, since the module will only be associated with one or the other. Signed-off-by: Brian Barrett <bbarrett@amazon.com>
bosilca
reviewed
Oct 17, 2018
Simplify selection of the address to publish for a given BTL TCP module in the module exchange code. Rather than looping through all IP addresses associated with a node, looking for one that matches the kindex of a module, loop over the modules and use the address stored in the module structure. This also happens to be the address that the source will use to bind() in a connect() call, so this should eliminate any confusion (read: bugs) when an interface has multiple IPs associated with it. Refs open-mpi#5818 Signed-off-by: Brian Barrett <bbarrett@amazon.com>
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@bosilca fixed the address family option, which was tested on a platform with mixed IPv4 and IPv6 addresses. Ran out of time to implement the "use the address specified in the if_include / if_exclude" design. I don't think it's a huge design change (change tcp_create to take a sockaddr_storage instead of a kindex), but pulling apart the spilt_and_resolve is kind of going to suck. |
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bosilca
reviewed
Oct 19, 2018
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Two patches that end up with simplifying the modex send so that we're not racy in a multi-IP per NIC design. We were already storing a source address in the local BTL, for use to bind() and force the source address to be known to us. With this patch, we guarantee that the address we use for bind() is the same we publish in the modex.
This should help with #5818.