#Netmap example how to
#Netmap example Patch
#Netmap example software

#Netmap example how to

In this article, I will walk you through how to create custom middleware to handle requests with simple SOAP payloads. This allows developers to plug in request handlers like MVC middleware, static file providers, authentication, error pages, or even their own custom middleware. The behavior of an ASP.NET Core appвЂ™s HTTP request handling pipeline can be easily customized by specifying different middleware components.

#Netmap example Patch

We would like to thanks Luigi and Giuseppe for their great help shaping the final patch and their work on netmap.One of the great things about ASP.NET Core is its extensibility. configure -kernel-sources=/path/to/kernel/sources -driver=ixgbeДЄnd launch the application: $ sudo. $ cd cloudflare-blog/2015-12-nm-single-rx-queueД«uild and load netmap: $ cd deps/netmap/LINUX The test program source code is available on github:ДЇirst clone the test application and the netmap repository: $ git clone In this example we are using the ixgbe driver. You can follow these instructions to build a test program under Linux. This: snprintf(nm_if, sizeof(nm_if) вЂњnetmap:%s~%dвЂќ, if_name, ring_nr) Д«ecomes this: snprintf(nm_if, sizeof(nm_if), вЂњnetmap:%s-%d/RвЂќ, iface_name, ring_nr) ДЄnd everything kept working as expected! Try it out With these changes, the only line we needed to edit in our code was the netmap interface name passed to nm_open(). To achieve this we introduced a couple of flags, NR_TX_RINGS_ONLY and NR_RX_RINGS_ONLY (which translate to /T and /R when we are using nm_open()) to request only TX or RX rings. Last, for simpler use cases we needed a way to ask for only the RX rings, without the TX counterpart - we do not need TX rings for our specific use case.

#Netmap example software

In this way we can access these packets from netmap simply by opening the interface again in netmap mode and asking for its software ring pair.

In this way, if a user requests a pair of rings (for example using nm_open(вЂњnetmap:eth0-4вЂќ)) it will actually get a reference to both the number 4 RX and TX rings, while keeping the other rings attached to the kernel stack.Д«ut since the NIC is still partially connected to the host stack, a new problem arises: what should we do with packets that are going to be transmitted by the operating system to a TX ring which is in netmap mode? The solution is simple: just move them to the RX host ring. Our final patch is extended and more generic, while still supporting the simple functionality of our original single-rx-queue mode.ДЇirst we modified netmap to leave queues that are not explicitly requested to be in netmap mode attached to the host stack. Even a netmap mode called вЂњsingle ring pairвЂќ didn't help. All of the queues would have to be detached from the host network stack. That is: there was no way to put a network adapter partially in netmap mode. Meet the new netmapД«efore our patch netmap used to be an all-or-nothing deal. In a previous post we described our work on a new netmap mode called single-rx-queue.ДЄfter submitting the pull request, the netmap maintainers told us that the patch was interesting, but they would prefer something more configurable instead of a tailored custom mode.ДЄfter an exchange of ideas and some more work, our patch just got merged to mainline netmap.