[dpdk-dev] could not l2fwd in DOM0
Liu, Jijiang
jijiang.liu at intel.com
Wed May 7 06:35:46 CEST 2014
Hi,
I have checked source codes of xen_create_contiguous_region function in kernel 3.14, and found the dma_handle cannot be NULL.
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
unsigned long *in_frames = discontig_frames, out_frame;
unsigned long flags;
int success;
unsigned long vstart = (unsigned long)phys_to_virt(pstart);
...
*dma_handle = virt_to_machine(vstart).maddr;
return success ? 0 : -ENOMEM;
}
Thanks
Frank Liu
-----Original Message-----
From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Samuel Monderer
Sent: Wednesday, April 30, 2014 1:54 AM
To: dev at dpdk.org<mailto:dev at dpdk.org>
Cc: Shimon Zadok
Subject: [dpdk-dev] could not l2fwd in DOM0
Hi,
First I've encountered a compiling problem when compiling for DOM0 due to prototype change of the function xen_create_contiguous_region I made the following changes:
diff --git a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c b/lib/librte_eal/linuxapp/xen index 87fa3e6..8addc21 100644
--- a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
+++ b/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
@@ -64,6 +64,7 @@
#include <linux/errno.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
+//#include <linux/types.h>
#include <xen/xen.h>
#include <xen/page.h>
@@ -309,6 +310,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct dom0_mm_data
uint64_t pfn, vstart, vaddr;
uint32_t i, num_block, size;
int idx;
+ dma_addr_t *dma_handle = NULL;
/* Allocate 2M memory once */
num_block = meminfo->size / 2;
@@ -344,7 +346,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct dom0_mm_data
* contiguous physical addresses, its maximum size is 2M.
*/
if (xen_create_contiguous_region(mm_data->block_info[i].vir_addr,
- DOM0_CONTIG_NUM_ORDER, 0) == 0) {
+ DOM0_CONTIG_NUM_ORDER, 0,
+ dma_handle) == 0) {
mm_data->block_info[i].exchange_flag = 1;
mm_data->block_info[i].mfn =
pfn_to_mfn(mm_data->block_info[i].pfn);
After that I tried to run l2fwd example and got a segmentation fault
root at Smart:~/samuelm/dpdk/dpdk# modprobe uio root at Smart:~/samuelm/dpdk/dpdk# insmod ./x86_64-default-linuxapp-gcc/kmod/igb_uio.ko
root at Smart:~/samuelm/dpdk/dpdk# insmod ./x86_64-default-linuxapp-gcc/kmod/rte_dom0_mm.ko
root at Smart:~/samuelm/dpdk/dpdk# cd examples/l2fwd/build/ root at Smart:~/samuelm/dpdk/dpdk/examples/l2fwd/build# echo 2048 > /sys/kernel/mm/dom0-mm/memsize-mB/memsize
root at Smart:~/samuelm/dpdk/dpdk/examples/l2fwd/build# ./l2fwd -c 3 -n 4 --xen-dom0 -- -q 1 -p 3
EAL: Detected lcore 0 as core 0 on socket 0
EAL: Detected lcore 1 as core 0 on socket 0
EAL: Setting up memory...
Segmentation fault
root at Smart:~/samuelm/dpdk/dpdk/examples/l2fwd/build#
Has anyone already encountered this problem?
Samuelm
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