From dbd83f04dfb4b4265a290bad6a1813825f7ab3c6 Mon Sep 17 00:00:00 2001 From: Tobias Klauser Date: Thu, 29 Oct 2015 14:18:03 +0100 Subject: ring: Move generic code for ring layout setup to own function Initialization of the ring->layout members is the same for RX and TX rings. Instead of duplicating the code in setup_rx_ring_layout() and setup_tx_ring_layout(), create a new function setup_ring_layout_generic() which is called from the former two. Signed-off-by: Tobias Klauser --- ring.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'ring.c') diff --git a/ring.c b/ring.c index e42828e..26de18e 100644 --- a/ring.c +++ b/ring.c @@ -1,6 +1,7 @@ /* * netsniff-ng - the packet sniffing beast * Copyright 2009, 2010 Daniel Borkmann. + * Copyright 2014, 2015 Tobias Klauser * Subject to the GPL, version 2. */ @@ -19,6 +20,26 @@ #include "ring.h" #include "built_in.h" +void setup_ring_layout_generic(int sock, struct ring *ring, size_t size, + bool jumbo_support) +{ + fmemset(&ring->layout, 0, sizeof(ring->layout)); + + ring->layout.tp_block_size = (jumbo_support ? + RUNTIME_PAGE_SIZE << 4 : + RUNTIME_PAGE_SIZE << 2); + + ring->layout.tp_frame_size = (jumbo_support ? + TPACKET_ALIGNMENT << 12 : + TPACKET_ALIGNMENT << 7); + + ring->layout.tp_block_nr = size / ring->layout.tp_block_size; + ring->layout.tp_frame_nr = ring->layout.tp_block_size / + ring->layout.tp_frame_size * + ring->layout.tp_block_nr; + +} + void mmap_ring_generic(int sock, struct ring *ring) { ring->mm_space = mmap(NULL, ring->mm_len, PROT_READ | PROT_WRITE, -- cgit v1.2.3-54-g00ecf