I am trying a simple MBUF create from an allocated pool and freeing the MBUF, however running into the following compilation issues.. If I comment out the mbuf_free, the program compiles fine.. Any pointers please ?
Code :
m = rte_pktmbuf_alloc(pktmbuf_pool);
if (m == NULL)
printf("Cannot allocate mbuf");
if (rte_pktmbuf_pkt_len(m) != 0)
printf("Bad length");
data = rte_pktmbuf_append(m, packet_len);
if (data == NULL)
printf("Cannot append data");
....
rte_pktmbuf_free(packet_data_mbuf); <<<<< COMPLAINS here
Error:
/usr/local/include/dpdk/rte_memcpy.h: In function ‘__rte_pktmbuf_free_direct’:
/usr/local/include/dpdk/rte_memcpy.h:595:64: error: ‘__builtin_ia32_palignr128’ needs isa option -m32 -mssse3
_mm_storeu_si128((__m128i *)((uint8_t *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset)); \
^
/usr/local/include/dpdk/rte_memcpy.h:644:16: note: in expansion of macro ‘MOVEUNALIGNED_LEFT47_IMM’
case 0x01: MOVEUNALIGNED_LEFT47_IMM(dst, src, n, 0x01); break; \
^~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/dpdk/rte_memcpy.h:798:2: note: in expansion of macro ‘MOVEUNALIGNED_LEFT47’
MOVEUNALIGNED_LEFT47(dst, src, n, srcofs);
^~~~~~~~~~~~~~~~~~~~
......
......
DPDK API __rte_pktmbuf_free_direct makes use of SIMD intrinsics _mm_alignr_epi8. this internally relies on palignr which are part of SSSE3 instruction set.
based on the compiler message error: ‘__builtin_ia32_palignr128’ needs ISA option -m32 -mssse3, it appears the compiler flag of -mssse3 is not passed during built.
Solution: update the CFLAGS with minimum DPDK requirement of -mssse3 for x86 platform.
Note: If the dpdk version is greater than 19.08, for either custom installed or distro released libdpdk, a simple way to set the right flags is to set CFGLAGS+=$(pkg-config --cflags libdpdk)