ceph/src/seastar/dpdk/examples/flow_filtering/flow_blocks.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2017 Mellanox Technologies, Ltd
   3  */
   4
   5 #define MAX_PATTERN_NUM         3
   6 #define MAX_ACTION_NUM          2
   7
   8 struct rte_flow *
   9 generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
  10                 uint32_t src_ip, uint32_t src_mask,
  11                 uint32_t dest_ip, uint32_t dest_mask,
  12                 struct rte_flow_error *error);
  13
  14
  15 /**
  16  * create a flow rule that sends packets with matching src and dest ip
  17  * to selected queue.
  18  *
  19  * @param port_id
  20  *   The selected port.
  21  * @param rx_q
  22  *   The selected target queue.
  23  * @param src_ip
  24  *   The src ip value to match the input packet.
  25  * @param src_mask
  26  *   The mask to apply to the src ip.
  27  * @param dest_ip
  28  *   The dest ip value to match the input packet.
  29  * @param dest_mask
  30  *   The mask to apply to the dest ip.
  31  * @param[out] error
  32  *   Perform verbose error reporting if not NULL.
  33  *
  34  * @return
  35  *   A flow if the rule could be created else return NULL.
  36  */
  37 struct rte_flow *
  38 generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
  39                 uint32_t src_ip, uint32_t src_mask,
  40                 uint32_t dest_ip, uint32_t dest_mask,
  41                 struct rte_flow_error *error)
  42 {
  43         struct rte_flow_attr attr;
  44         struct rte_flow_item pattern[MAX_PATTERN_NUM];
  45         struct rte_flow_action action[MAX_ACTION_NUM];
  46         struct rte_flow *flow = NULL;
  47         struct rte_flow_action_queue queue = { .index = rx_q };
  48         struct rte_flow_item_ipv4 ip_spec;
  49         struct rte_flow_item_ipv4 ip_mask;
  50         int res;
  51
  52         memset(pattern, 0, sizeof(pattern));
  53         memset(action, 0, sizeof(action));
  54
  55         /*
  56          * set the rule attribute.
  57          * in this case only ingress packets will be checked.
  58          */
  59         memset(&attr, 0, sizeof(struct rte_flow_attr));
  60         attr.ingress = 1;
  61
  62         /*
  63          * create the action sequence.
  64          * one action only,  move packet to queue
  65          */
  66         action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
  67         action[0].conf = &queue;
  68         action[1].type = RTE_FLOW_ACTION_TYPE_END;
  69
  70         /*
  71          * set the first level of the pattern (ETH).
  72          * since in this example we just want to get the
  73          * ipv4 we set this level to allow all.
  74          */
  75         pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
  76
  77         /*
  78          * setting the second level of the pattern (IP).
  79          * in this example this is the level we care about
  80          * so we set it according to the parameters.
  81          */
  82         memset(&ip_spec, 0, sizeof(struct rte_flow_item_ipv4));
  83         memset(&ip_mask, 0, sizeof(struct rte_flow_item_ipv4));
  84         ip_spec.hdr.dst_addr = htonl(dest_ip);
  85         ip_mask.hdr.dst_addr = dest_mask;
  86         ip_spec.hdr.src_addr = htonl(src_ip);
  87         ip_mask.hdr.src_addr = src_mask;
  88         pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
  89         pattern[1].spec = &ip_spec;
  90         pattern[1].mask = &ip_mask;
  91
  92         /* the final level must be always type end */
  93         pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
  94
  95         res = rte_flow_validate(port_id, &attr, pattern, action, error);
  96         if (!res)
  97                 flow = rte_flow_create(port_id, &attr, pattern, action, error);
  98
  99         return flow;
 100 }
 101