From: Bruce Richardson Date: Fri, 28 Apr 2017 16:21:12 +0000 (+0100) Subject: net/ixgbe: add compile-time checks to vector driver X-Git-Tag: spdx-start~3181 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=631a2f530b6c1ea17e1c504f6170e6127439509a;p=dpdk.git net/ixgbe: add compile-time checks to vector driver The vector PMD is very sensitive to the layout of the mbuf, especially on the RX path. Add in some compile-time checks to make sure the mbuf layout assumptions are valid, and to provide hints to anyone changing the mbuf where things may need to be updated. Signed-off-by: Bruce Richardson --- diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c index a7bc199ffa..203f092dfa 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c +++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c @@ -87,6 +87,8 @@ ixgbe_rxq_rearm(struct ixgbe_rx_queue *rxq) mb1 = rxep[1].mbuf; /* load buf_addr(lo 64bit) and buf_physaddr(hi 64bit) */ + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, buf_physaddr) != + offsetof(struct rte_mbuf, buf_addr) + 8); vaddr0 = _mm_loadu_si128((__m128i *)&(mb0->buf_addr)); vaddr1 = _mm_loadu_si128((__m128i *)&(mb1->buf_addr)); @@ -234,6 +236,11 @@ desc_to_olflags_v(__m128i descs[4], __m128i mbuf_init, uint8_t vlan_flags, #endif /* RTE_MACHINE_CPUFLAG_SSE4_2 */ + /* write the rearm data and the olflags in one write */ + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, ol_flags) != + offsetof(struct rte_mbuf, rearm_data) + 8); + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, rearm_data) != + RTE_ALIGN(offsetof(struct rte_mbuf, rearm_data), 16)); _mm_store_si128((__m128i *)&rx_pkts[0]->rearm_data, rearm0); _mm_store_si128((__m128i *)&rx_pkts[1]->rearm_data, rearm1); _mm_store_si128((__m128i *)&rx_pkts[2]->rearm_data, rearm2); @@ -266,6 +273,15 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts, -rxq->crc_len, /* sub crc on pkt_len */ 0, 0 /* ignore pkt_type field */ ); + /* + * compile-time check the above crc_adjust layout is correct. + * NOTE: the first field (lowest address) is given last in set_epi16 + * call above. + */ + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) != + offsetof(struct rte_mbuf, rx_descriptor_fields1) + 4); + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) != + offsetof(struct rte_mbuf, rx_descriptor_fields1) + 8); __m128i dd_check, eop_check; __m128i mbuf_init; uint8_t vlan_flags; @@ -312,6 +328,19 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts, 0xFF, 0xFF, /* skip 32 bit pkt_type */ 0xFF, 0xFF ); + /* + * Compile-time verify the shuffle mask + * NOTE: some field positions already verified above, but duplicated + * here for completeness in case of future modifications. + */ + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) != + offsetof(struct rte_mbuf, rx_descriptor_fields1) + 4); + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) != + offsetof(struct rte_mbuf, rx_descriptor_fields1) + 8); + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, vlan_tci) != + offsetof(struct rte_mbuf, rx_descriptor_fields1) + 10); + RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, hash) != + offsetof(struct rte_mbuf, rx_descriptor_fields1) + 12); mbuf_init = _mm_set_epi64x(0, rxq->mbuf_initializer);