调用函数rte_ring_create创建ring,它会申请一块memzone的内存,大小为struct rte_ring结构加上count个void类型指针,内存结构如下: 然后将ring中生产者和消费者的头尾指向0,最后将ring作为struct rte_tailq_entry的data插入共享内存链表,这样主从进程都可以访问此ring。 /*** An RTE ring structure.** The producer a...
最后需要说明的一点是:在DPDK中,创建的mempool,ring等可以在多个进程间访问,也是因为在rte_config.mem_config中有个成员是struct rte_tailq_head tailq_head[RTE_MAX_TAILQ],创建的ring等队列头都是挂在其中,是通过构造函数在main函数之前就挂接上的。 2.3 rte_eal_memory_init() 这个函数是初始化内存子系统,...
rte_memzone_reserve用来从heap中分配一个内存,可用指定长度和socket。、 /* * Return a pointer to a correctly filled memzone descriptor. If the * allocation cannot be done, return NULL. */ const struct rte_memzone * rte_memzone_reserve(const char *name, size_t len, int socket_id, unsigned ...
EAL: PCI device0000:00:04.0on NUMA socket -1EAL: probe driver: 1af4:1000rte_virtio_pmd USER1: create anewmbuf pool <mbuf_pool_socket_0>: n=267456, size=2304, socket=0RING: Cannot reserve memory EAL: Error- exiting with code:1Cause: Creation of mbuf poolforsocket0failed: Cannot alloc...
接着rte_memzone_reserve_aligned() 分配空间。把元素添加到mempool,实际上就是把申请的空间分给每个元素。 (3)ring的创建 先看到的是这么一段代码: static intmempool_ops_alloc_once(struct rte_mempool *mp){int ret;/* create the internal ring if not already done */if ((mp->flags & MEMPOOL_F_...
/**< Common rx buffer size handled by all queues */uint64_t rx_mbuf_alloc_failed; /**< RX ring mbuf allocation failures. */ struct ether_addr* mac_addrs;/**< Device Ethernet Link address. */uint64_t mac_pool_sel[ETH_NUM_RECEIVE_MAC_ADDR]; ...
将所有memseg信息在所有dpdk程序间共享 297 */ 298 if (rte_eal_memory_init() < 0) { 299 rte_eal_init_alert("Cannot init memory"); 300 rte_errno = ENOMEM; 301 return -1; 302 } 303 304 /* the directories are locked during eal_hugepage_info_init */ 305 //解锁hugepage目录(由前面...
64 65 /* RX RING */ 66 snprintf(obj_name, OBJNAMSIZ, "kni_rx_%d", i); 67 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE, 68 SOCKET_ID_ANY, 0); 69 KNI_MEM_CHECK(mz == NULL); 70 it->m_rx_q = mz; 71 72 /* ALLOC RING */ 73 snprintf(obj_name, OBJNAMSIZ, "kni...
When a qemu instance boots, it will allocate all of the instance memory as shared hugepages. The OS' virtio paravirtualized driver will reserve part of this hugepage memory for holding the virtio ring buffer. This allows OVS DPDK to directly read from and write into the instance's virtio ri...
The CPU state (user application) is stored in memory; CPU privilege mode is changed from underprivileged to privileged (from ring 3 to ring 0); privileged mode allows for more control over the host system, e.g. access IO ports, configure page tables; ...