On Mon, Nov 5, 2018 at 3:12 PM Burakov, Anatoly <anatoly.bura...@intel.com> wrote:
> On 05-Nov-18 10:13 AM, Alejandro Lucero wrote: > > On Mon, Nov 5, 2018 at 10:01 AM Li, WenjieX A <wenjiex.a...@intel.com> > > wrote: > > > >> 1. With GCC32, testpmd could not startup without '--iova-mode pa'. > >> ./i686-native-linuxapp-gcc/app/testpmd -c f -n 4 -- -i > >> The output is: > >> EAL: Detected 16 lcore(s) > >> EAL: Detected 1 NUMA nodes > >> EAL: Multi-process socket /var/run/dpdk/rte/mp_socket > >> EAL: Some devices want iova as va but pa will be used because.. EAL: few > >> device bound to UIO > >> EAL: No free hugepages reported in hugepages-1048576kB > >> EAL: Probing VFIO support... > >> EAL: VFIO support initialized > >> EAL: wrong dma mask size 48 (Max: 31) > >> EAL: alloc_pages_on_heap(): couldn't allocate memory due to IOVA > exceeding > >> limits of current DMA mask > >> error allocating rte services array > >> EAL: FATAL: rte_service_init() failed > >> EAL: rte_service_init() failed > >> PANIC in main(): > >> Cannot init EAL > >> 5: [./i686-native-linuxapp-gcc/app/testpmd(+0x95fda) [0x56606fda]] > >> 4: [/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf6) [0xf74d1276]] > >> 3: [./i686-native-linuxapp-gcc/app/testpmd(main+0xf21) [0x565fcee1]] > >> 2: [./i686-native-linuxapp-gcc/app/testpmd(__rte_panic+0x3d) > [0x565edc68]] > >> 1: [./i686-native-linuxapp-gcc/app/testpmd(rte_dump_stack+0x33) > >> [0x5675f333]] > >> Aborted > >> > >> 2. With '--iova-mode pa', testpmd could startup. > >> 3. With GCC64, there is no such issue. > >> Thanks! > >> > >> > > Does 32 bits support require IOMMU? It would be a surprise. If there is > no > > IOMMU hardware, no dma mask should be there at all. > > IOMMU is supported on 32-bits, however limited the address space might > be. Maybe limit IOMMU width to RTE_MIN(31, value) bits for everything on > 32-bit? > > If IOMMU is supported in 32 bits, then the DMA mask check should not be happening. AFAIK, the IOMMU hardware addressing limitations is a problem only in 64 bits systems. The worst situation I have head of is 39 bits for virtualized IOMMU with QEMU. I would prefer not to invoke rte_mem_set_dma_mask for 32 bits system for the Intel IOMMU case. The only other dma mask client is the NFP PMD and we do not support 32 bits systems. > -- > Thanks, > Anatoly >
