Dear Group members, I have been trying to understand the dpdk code and have got two queries.
1. descriptor rings and packet buffer allocation Looking at the linux native e1000 kernel driver, Memory for NIC's tx and rx descriptor rings are allocated using dma_alloc_coherent. Memory for rx packet buffers are allocated using netdev_alloc_skb and dma address (after dma_map_single) of skb->data is set to rx descriptor to receive packet onto skb. Looking at dpdk user space driver, all rings and packet allocation is done using (dpdk) mem pools. I would like to know a) whether the mem pool internally uses dma_alloc_coherent like apis to allocate buffers b) if the buffer is allocated by kernel, how does the user space application map them and access the packet data directly. 2. kni what is the internal mechanism used to implement FIFO-based shared memory (used between kernel and user-land). Thanks in advance, Rajasekhar
