From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ouyang Changchun Subject: [PATCH 2/3] [PMD] [VHOST] Support zero copy RX/TX in user space vhost Date: Mon, 19 May 2014 19:15:40 +0800 Message-ID: <1400498141-16360-3-git-send-email-changchun.ouyang@intel.com> References: <1400498141-16360-1-git-send-email-changchun.ouyang@intel.com> To: dev-VfR2kkLFssw@public.gmane.org Return-path: In-Reply-To: <1400498141-16360-1-git-send-email-changchun.ouyang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" Implement mbuf metadata macros to facilitate refering to space in mbuf headroom; Signed-off-by: Ouyang Changchun --- lib/librte_mbuf/rte_mbuf.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h index edffc2c..baf3ca4 100644 --- a/lib/librte_mbuf/rte_mbuf.h +++ b/lib/librte_mbuf/rte_mbuf.h @@ -201,8 +201,25 @@ struct rte_mbuf { struct rte_ctrlmbuf ctrl; struct rte_pktmbuf pkt; }; + + union { + uint8_t metadata[0]; + uint16_t metadata16[0]; + uint32_t metadata32[0]; + uint64_t metadata64[0]; + }; } __rte_cache_aligned; +#define RTE_MBUF_METADATA_UINT8(mbuf, offset) (mbuf->metadata[offset]) +#define RTE_MBUF_METADATA_UINT16(mbuf, offset) (mbuf->metadata16[offset/sizeof(uint16_t)]) +#define RTE_MBUF_METADATA_UINT32(mbuf, offset) (mbuf->metadata32[offset/sizeof(uint32_t)]) +#define RTE_MBUF_METADATA_UINT64(mbuf, offset) (mbuf->metadata64[offset/sizeof(uint64_t)]) + +#define RTE_MBUF_METADATA_UINT8_PTR(mbuf, offset) (&mbuf->metadata[offset]) +#define RTE_MBUF_METADATA_UINT16_PTR(mbuf, offset) (&mbuf->metadata16[offset/sizeof(uint16_t)]) +#define RTE_MBUF_METADATA_UINT32_PTR(mbuf, offset) (&mbuf->metadata32[offset/sizeof(uint32_t)]) +#define RTE_MBUF_METADATA_UINT64_PTR(mbuf, offset) (&mbuf->metadata64[offset/sizeof(uint64_t)]) + /** * Given the buf_addr returns the pointer to corresponding mbuf. */ -- 1.9.0