DPDK 18.11 flow director API

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文档

intel X722 网卡控制器的 datesheet 在网上是找不到的.
打英特尔官网客服 4009202200 也是找不到的.

intel X722 模块属于 intel C628 Chipset 的内置功能.
在ethernet-network-adapter-x722-product-brief.pdf中的Adapter Feature章节中的Controller中找到说明.
ethernet-network-adapter-x722-product-brief.pdf

所以, 找到 intel C628 的 datesheet 就可以找到 X722 的全部说明.
搜索 c620-series-chipset-datasheet.pdf 即可!!!
c620-series-chipset-datasheet.pdf

以下说明 为X722 flow director 相关功能:
flow director 匹配模式 上限条数是 8K 条.
定义在:c620-series-chipset-datasheet.pdf的2284页

flow director 数据进入硬件的解析范围 是报文的前480字节.
定义在:c620-series-chipset-datasheet.pdf的2697页中的38.21.1.2 节中有详细说明.

flow director Flexible payload 长度为16字节.
如果报文在硬件上解析识别为 L2 类型, Flexible payload 为 ETH_TYPE 之后
如果报文在硬件上解析识别为 L3 类型, Flexible payload 为 L3 协议头之后
如果报文在硬件上解析识别为 L4 类型, Flexible payload 为 L4 协议头 之后
定义在:c620-series-chipset-datasheet.pdf的2700页中的38.21.1.4 节中有详细说明.

环境

CentOS 7.4

固件

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[root@localhost ~]# lshw -c network -businfo
Bus info          Device     Class          Description
=======================================================
pci@0000:03:00.0  enp3s0f0   network        I350 Gigabit Network Connection
pci@0000:03:00.1  enp3s0f1   network        I350 Gigabit Network Connection
pci@0000:03:00.2  enp3s0f2   network        I350 Gigabit Network Connection
pci@0000:03:00.3  enp3s0f3   network        I350 Gigabit Network Connection
pci@0000:1a:00.0  enp26s0f0  network        Ethernet Connection X722 for 10GbE SFP+
pci@0000:1a:00.1  enp26s0f1  network        Ethernet Connection X722 for 10GbE SFP+
pci@0000:1a:00.2  enp26s0f2  network        Ethernet Connection X722 for 10GbE SFP+
pci@0000:1a:00.3  enp26s0f3  network        Ethernet Connection X722 for 10GbE SFP+
pci@0000:3c:00.0  enp60s0    network        Ethernet Controller XL710 for 40GbE backplane
pci@0000:86:00.0  enp134s0   network        Ethernet Controller XL710 for 40GbE backplane
[root@localhost ~]#

[root@localhost ~]# ethtool -i enp3s0f1
driver: igb
version: 5.4.0-k
firmware-version: 1.48.0
expansion-rom-version:
bus-info: 0000:03:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
[root@localhost ~]#

[root@localhost ~]# ethtool -i enp26s0f1
driver: i40e
version: 1.6.27-k
firmware-version: 4.10 0x80001a30 1.2154.0
expansion-rom-version:
bus-info: 0000:1a:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
[root@localhost ~]#

[root@localhost ~]# ethtool -i enp134s0
driver: i40e
version: 1.6.27-k
firmware-version: 5.04 0x800024d1 0.0.0
expansion-rom-version:
bus-info: 0000:86:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
[root@localhost ~]#

演示 API级别的 flow director 功能:

  1. ETH/ipv4/udp/raw spec_1 + mask_1 udp payload 关键字加掩码
  2. ETH/ipv4/udp/raw spec_2 + mask_1 udp payload 关键字变化,但用上一次的掩码
  3. ETH/ipv4/tcp/raw spec_3 + mask_3 tcp payload 关键字 + 掩码

DPDK flow director API

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <setjmp.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdbool.h>

#include <rte_eal.h>
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_net.h>
#include <rte_flow.h>
#include <rte_cycles.h>

static volatile bool force_quit;
static uint16_t port_id;
static uint16_t nr_queues = 5;
struct rte_mempool *mbuf_pool;
struct rte_flow *flow;
uint64_t queue_pkt[16] ={0};

static inline void
print_ether_addr(const char *what, struct ether_addr *eth_addr)
{
    char buf[ETHER_ADDR_FMT_SIZE];
    ether_format_addr(buf, ETHER_ADDR_FMT_SIZE, eth_addr);
    printf("%s%s", what, buf);
}

static void
main_loop(void)
{
    struct rte_mbuf *mbufs[32];
    //struct ether_hdr *eth_hdr;
    struct rte_flow_error error;
    uint16_t nb_rx;
    uint16_t i;
    uint16_t j;

    while (!force_quit) {
        for (i = 0; i < nr_queues; i++) {
            nb_rx = rte_eth_rx_burst(port_id, i, mbufs, 32);
            if (nb_rx) {
                for (j = 0; j < nb_rx; j++) {
                    struct rte_mbuf *m = mbufs[j];
                    //eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
                    queue_pkt[i]++;
                    //print_ether_addr("src=", &eth_hdr->s_addr);
                    //print_ether_addr(" -> dst=",  &eth_hdr->d_addr);
                    //printf(" : queue=0x%x\n", (unsigned int)i);
                    rte_pktmbuf_free(m);
                }
            }
        }
    }
    rte_flow_flush(port_id, &error);
    rte_eth_dev_stop(port_id);
    rte_eth_dev_close(port_id);
}

#define CHECK_INTERVAL 1000  /* 100ms */
#define MAX_REPEAT_TIMES 90  /* 9s (90 * 100ms) in total */
static void
assert_link_status(void)
{
    struct rte_eth_link link;
    uint8_t rep_cnt = MAX_REPEAT_TIMES;

    memset(&link, 0, sizeof(link));
    do {
        rte_eth_link_get(port_id, &link);
        if (link.link_status == ETH_LINK_UP)
            break;
        rte_delay_ms(CHECK_INTERVAL);
    } while (--rep_cnt);

    if (link.link_status == ETH_LINK_DOWN)
        rte_exit(EXIT_FAILURE, ":: error: link is still down\n");
}

static void
init_port(void)
{
    int ret;
    uint16_t i;
    struct rte_eth_conf port_conf = {
        .rxmode = {
            .split_hdr_size = 0,
        },
        .txmode = {
            .offloads =
                DEV_TX_OFFLOAD_VLAN_INSERT |
                DEV_TX_OFFLOAD_IPV4_CKSUM  |
                DEV_TX_OFFLOAD_UDP_CKSUM   |
                DEV_TX_OFFLOAD_TCP_CKSUM   |
                DEV_TX_OFFLOAD_SCTP_CKSUM  |
                DEV_TX_OFFLOAD_TCP_TSO,
        },
        .fdir_conf = {
            .mode = RTE_FDIR_MODE_PERFECT,
            .pballoc = RTE_FDIR_PBALLOC_64K,
            .status = RTE_FDIR_REPORT_STATUS,
        },
    };
    struct rte_eth_txconf txq_conf;
    struct rte_eth_rxconf rxq_conf;
    struct rte_eth_dev_info dev_info;

    rte_eth_dev_info_get(port_id, &dev_info);
    port_conf.txmode.offloads &= dev_info.tx_offload_capa;
    ret = rte_eth_dev_configure(port_id, nr_queues, nr_queues, &port_conf);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE,
            ":: cannot configure device: err=%d, port=%u\n",
            ret, port_id);
    }

    rxq_conf = dev_info.default_rxconf;
    rxq_conf.offloads = port_conf.rxmode.offloads;
    /* only set Rx queues: something we care only so far */
    for (i = 0; i < nr_queues; i++) {
        ret = rte_eth_rx_queue_setup(port_id, i, 512,
                     rte_eth_dev_socket_id(port_id),
                     &rxq_conf,
                     mbuf_pool);
        if (ret < 0) {
            rte_exit(EXIT_FAILURE,
                ":: Rx queue setup failed: err=%d, port=%u\n",
                ret, port_id);
        }
    }

    txq_conf = dev_info.default_txconf;
    txq_conf.offloads = port_conf.txmode.offloads;

    for (i = 0; i < nr_queues; i++) {
        ret = rte_eth_tx_queue_setup(port_id, i, 512,
                rte_eth_dev_socket_id(port_id),
                &txq_conf);
        if (ret < 0) {
            rte_exit(EXIT_FAILURE,
                ":: Tx queue setup failed: err=%d, port=%u\n",
                ret, port_id);
        }
    }

    rte_eth_promiscuous_enable(port_id);
    ret = rte_eth_dev_start(port_id);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE,
            "rte_eth_dev_start:err=%d, port=%u\n",
            ret, port_id);
    }
    assert_link_status();
    printf(":: initializing port: %d done\n", port_id);
}

static void
signal_handler(int signum)
{
    if (signum == SIGINT || signum == SIGTERM) {
        force_quit = true;
    }
}


static int ipv4_tcp_raw(const uint8_t* key, const uint8_t* mask, int len)
{
    struct rte_flow *flow = NULL;
    struct rte_flow_error  error;
    struct rte_flow_attr   attr;
    struct rte_flow_item   pattern[10];
    struct rte_flow_action action[10];
    struct rte_flow_action_queue queue = { .index = 1};// 命中的报文 放在 1号队列

    memset(pattern, 0, sizeof(pattern));
    memset(action, 0, sizeof(action));
    memset(&attr, 0, sizeof(struct rte_flow_attr));

    struct rte_flow_item_raw raw_spec = {
        .relative   = 1,
        .reserved   = 0,
        .offset     = 0,
        .limit      = 0,
        .length     = len,
        .pattern    = key,
    };

    struct rte_flow_item_raw raw_mask = {
        .relative = 1,
        .search   = 1,
        .reserved = 0x3fffffff,
        .offset   = 0xffffffff,
        .limit    = 0xffff,
        .length   = 0xffff,
        .pattern  = mask,
    };

    attr.ingress = 1;

    pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
    pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
    pattern[2].type = RTE_FLOW_ITEM_TYPE_TCP;
    pattern[3].type = RTE_FLOW_ITEM_TYPE_RAW;
    pattern[3].spec = &raw_spec;
    pattern[3].mask = &raw_mask;

    action[0].type  = RTE_FLOW_ACTION_TYPE_QUEUE;
    action[0].conf  = &queue;

    flow = rte_flow_create(port_id, &attr, pattern, action, &error);
    if (!flow)
    {
        printf("Flow can't be created %d message: %s\n",
            error.type,
            error.message ? error.message : "(no stated reason)");
        rte_exit(EXIT_FAILURE, "error in creating flow");
    }

    printf("create flow director %p\n", flow);
    return 0;
}

static int ipv4_udp_raw(const uint8_t* key, const uint8_t* mask, int len)
{
    struct rte_flow *flow = NULL;
    struct rte_flow_error  error;
    struct rte_flow_attr   attr;
    struct rte_flow_item   pattern[10];
    struct rte_flow_action action[10];
    struct rte_flow_action_queue queue = { .index = 1};// 命中的报文 放在 1号队列

    memset(pattern, 0, sizeof(pattern));
    memset(action, 0, sizeof(action));
    memset(&attr, 0, sizeof(struct rte_flow_attr));

    struct rte_flow_item_raw raw_spec = {
        .relative   = 1,
        .reserved   = 0,
        .offset     = 0,
        .limit      = 0,
        .length     = len,
        .pattern    = key,
    };

    struct rte_flow_item_raw raw_mask = {
        .relative = 1,
        .search   = 1,
        .reserved = 0x3fffffff,
        .offset   = 0xffffffff,
        .limit    = 0xffff,
        .length   = 0xffff,
        .pattern  = mask,
    };

    attr.ingress = 1;

    pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
    pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
    pattern[2].type = RTE_FLOW_ITEM_TYPE_UDP;
    pattern[3].type = RTE_FLOW_ITEM_TYPE_RAW;
    pattern[3].spec = &raw_spec;
    pattern[3].mask = &raw_mask;

    action[0].type  = RTE_FLOW_ACTION_TYPE_QUEUE;
    action[0].conf  = &queue;

    flow = rte_flow_create(port_id, &attr, pattern, action, &error);
    if (!flow)
    {
        printf("Flow can't be created %d message: %s\n",
            error.type,
            error.message ? error.message : "(no stated reason)");
        rte_exit(EXIT_FAILURE, "error in creating flow");
    }

    printf("create flow director %p\n", flow);
    return 0;
}


int
main(int argc, char **argv)
{
    int ret;
    uint16_t nr_ports;

    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, ":: invalid EAL arguments\n");

    force_quit = false;
    signal(SIGINT, signal_handler);
    signal(SIGTERM, signal_handler);

    nr_ports = rte_eth_dev_count_avail();
    if (nr_ports == 0)
        rte_exit(EXIT_FAILURE, ":: no Ethernet ports found\n");
    port_id = 0;
    if (nr_ports != 1) {
        printf(":: warn: %d ports detected, but we use only one: port %u\n",
            nr_ports, port_id);
    }
    mbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", 4096, 128, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
    if (mbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");

    init_port();

    // SEQ < 64
    const uint8_t pkt_spec_1[] = {0x97, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
    const uint8_t pkt_mask_1[] = {0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff};
    ipv4_udp_raw(pkt_spec_1, pkt_mask_1, sizeof(pkt_spec_1));

    // SEQ 16:1
    const uint8_t pkt_spec_2[] = {0x97, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02};
    const uint8_t pkt_mask_2[] = {0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff};
    ipv4_udp_raw(pkt_spec_2, pkt_mask_2, sizeof(pkt_spec_2));

    // match with eth.ipv4.tcp.payload is "GET /index.html"
    const uint8_t pkt_spec_3[] = {'G',  'E',  'T',  ' ',  '/',  'i',  'n',  'd',  'e',  'x',  '.',  'h',  't',  'm',  'l' };
    const uint8_t pkt_mask_3[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
    ipv4_tcp_raw(pkt_spec_3, pkt_mask_3, sizeof(pkt_spec_3));

    main_loop();
    printf("queue_id %d pkt累计:%zu\n", 0, queue_pkt[0]);
    printf("queue_id %d pkt累计:%zu\n", 1, queue_pkt[1]);
    printf("queue_id %d pkt累计:%zu\n", 2, queue_pkt[2]);
    printf("queue_id %d pkt累计:%zu\n", 3, queue_pkt[3]);
    return 0;
}

编译

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[root@localhost flow_filtering]# env | grep RTE
RTE_SDK=/root/git/dpdk/dpdk-stable-18.11.11
[root@localhost flow_filtering]#
[root@localhost flow_filtering]# make  clean;  make ; ./build/flow -l 0-9
  CC main.o
  LD flow
  INSTALL-APP flow
  INSTALL-MAP flow.map
EAL: Detected 40 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Probing VFIO support...
EAL: PCI device 0000:03:00.0 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:03:00.1 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:03:00.2 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:03:00.3 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:1a:00.0 on NUMA socket 0
EAL:   probe driver: 8086:37d0 net_i40e
EAL: PCI device 0000:1a:00.1 on NUMA socket 0
EAL:   probe driver: 8086:37d0 net_i40e
EAL: PCI device 0000:1a:00.2 on NUMA socket 0
EAL:   probe driver: 8086:37d0 net_i40e
EAL: PCI device 0000:1a:00.3 on NUMA socket 0
EAL:   probe driver: 8086:37d0 net_i40e
EAL: PCI device 0000:3c:00.0 on NUMA socket 0
EAL:   probe driver: 8086:1580 net_i40e
EAL: PCI device 0000:86:00.0 on NUMA socket 1
EAL:   probe driver: 8086:1580 net_i40e
:: initializing port: 0 done
i40e_flow_set_fdir_flex_pit(): i40e device 0000:1a:00.0 changed global register [0x0026898c]. original: 0x00000000, new: 0x000000a6
create flow director 0x17ff32040
create flow director 0x17ff30740
create flow director 0x17ff2c9c0

^Ci40e_flex_payload_reg_set_default(): i40e device 0000:1a:00.0 changed global register [0x0026898c]. original: 0x000000a6, new: 0x00000000
queue_id 0 pkt累计:0
queue_id 1 pkt累计:0
queue_id 2 pkt累计:0
queue_id 3 pkt累计:0
[root@localhost flow_filtering]#

不足

  1. intel X722 网卡 [ETH/ipv4/udp/raw][ETH/ipv4/tcp/raw], PCTYPE 只允许有一个MASK,
    这类 PCTYPE 只支持 1种掩码, 掩码的长度, 掩码的每一个bit, 都必须一样才能创建 FDIR, 否则提示 掩码 冲突!

举个例子:
需求: 匹配 HTTP 协议中的 GET 与 POST 报文, 存放到1号队列.
环境: 假设 只有 ipv4
网卡 X722
DPDK 18.11

创建一条规则, 类型为 ETH/ipv4/tcp/raw, 在 RTE_FLOW_ITEM_TYPE_RAW 参数 spec, mask, len=sizeof(spec) 配置如下

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const uint8_t pkt_spec_1[] = {0x97, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
const uint8_t pkt_mask_1[] = {0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff};

这条规则创建, 没有问题!

再创建一条规则 类型为 ETH/ipv4/tcp/raw, 在 RTE_FLOW_ITEM_TYPE_RAW 参数 spec, mask, len=sizeof(spec) 配置如下

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const uint8_t pkt_spec_1[] = {0x97, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02};
const uint8_t pkt_mask_1[] = {0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xfe};

这条规则创建, 无法创建!
上面这两条规则的掩码, 只相差1个bit

类似的, 在 testpmd 中 也是无法创建

OK

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 ./testpmd -l 0-9 -n 4 -- -i --nb-cores=8 --rxq=4 --txq=4 --disable-rss --pkt-filter-mode=perfect
flow create 0 ingress pattern eth / ipv4 / tcp / raw relative is 1  offset is 0  pattern is 123   / end actions queue index 1 / end
flow create 0 ingress pattern eth / ipv4 / tcp / raw relative is 1  offset is 0  pattern is ABC   / end actions queue index 1 / end

ERR

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 ./testpmd -l 0-9 -n 4 -- -i --nb-cores=8 --rxq=4 --txq=4 --disable-rss --pkt-filter-mode=perfect
flow create 0 ingress pattern eth / ipv4 / tcp / raw relative is 1  offset is 0  pattern is POST  / end actions queue index 1 / end
flow create 0 ingress pattern eth / ipv4 / tcp / raw relative is 1  offset is 0  pattern is AB   / end actions queue index 1 / end

i40e 驱动 一个 PCTYPE 只允许有一个MASK

  1. 支持的类型 太少!
    有些特定的业务场景, 就是套着 GTP 层, 需要在 UDP的payload的过滤, X722不支持
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    X722 不支持 ETH/ipv4/UDP/GTP/ipv4/TCP/RAW
    X722 不支持 ETH/ipv4/UDP/GTP/ipv4/UDP/RAW
    X722 不支持 ETH/ipv6/UDP/GTP/ipv4/TCP/RAW
    X722 不支持 ETH/ipv6/UDP/GTP/ipv4/UDP/RAW

    X722 不支持 ETH/ipv4/UDP/GTP/ipv6/TCP/RAW
    X722 不支持 ETH/ipv4/UDP/GTP/ipv6/UDP/RAW
    X722 不支持 ETH/ipv6/UDP/GTP/ipv6/TCP/RAW
    X722 不支持 ETH/ipv6/UDP/GTP/ipv6/UDP/RAW

E810 网卡, 支持上面的功能!!!

  1. X722 不支持 FDIR 优先级.
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    比如: 优先级1 规则1 输出到 X队列.
    比如: 优先级2 规则2 输出到 X队列.
    比如: 优先级3 规则3 输出到 Y队列.
          优先级X 规则N 动作
          优先级99 没有匹配上的规则, DROP.

    X722 不支持 优先级.

E810 网卡, 支持上面的功能!!!