i40e: fix build with gcc 4.4

Fix the build warning reported like:
   error: dereferencing pointer 'cmd' does break strict-aliasing rules

Fixes: a4def5edf0fc ("i40e: enable port mirroring")

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 02d17b4..dcf91bb 100644 (file)
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -5786,8 +5786,7 @@ i40e_aq_add_mirror_rule(struct i40e_hw *hw,
                        uint16_t count, uint16_t *rule_id)
 {
        struct i40e_aq_desc desc;
-       struct i40e_aqc_add_delete_mirror_rule *cmd =
-               (struct i40e_aqc_add_delete_mirror_rule *)&desc.params.raw;
+       struct i40e_aqc_add_delete_mirror_rule cmd;
        struct i40e_aqc_add_delete_mirror_rule_completion *resp =
                (struct i40e_aqc_add_delete_mirror_rule_completion *)
                &desc.params.raw;
@@ -5796,18 +5795,20 @@ i40e_aq_add_mirror_rule(struct i40e_hw *hw,
 
        i40e_fill_default_direct_cmd_desc(&desc,
                                          i40e_aqc_opc_add_mirror_rule);
+       memset(&cmd, 0, sizeof(cmd));
 
        buff_len = sizeof(uint16_t) * count;
        desc.datalen = rte_cpu_to_le_16(buff_len);
        if (buff_len > 0)
                desc.flags |= rte_cpu_to_le_16(
                        (uint16_t)(I40E_AQ_FLAG_BUF | I40E_AQ_FLAG_RD));
-       cmd->rule_type = rte_cpu_to_le_16(rule_type <<
+       cmd.rule_type = rte_cpu_to_le_16(rule_type <<
                                I40E_AQC_MIRROR_RULE_TYPE_SHIFT);
-       cmd->num_entries = rte_cpu_to_le_16(count);
-       cmd->seid = rte_cpu_to_le_16(seid);
-       cmd->destination = rte_cpu_to_le_16(dst_id);
+       cmd.num_entries = rte_cpu_to_le_16(count);
+       cmd.seid = rte_cpu_to_le_16(seid);
+       cmd.destination = rte_cpu_to_le_16(dst_id);
 
+       rte_memcpy(&desc.params.raw, &cmd, sizeof(cmd));
        status = i40e_asq_send_command(hw, &desc, entries, buff_len, NULL);
        PMD_DRV_LOG(INFO, "i40e_aq_add_mirror_rule, aq_status %d,"
                         "rule_id = %u"
@@ -5836,30 +5837,30 @@ i40e_aq_del_mirror_rule(struct i40e_hw *hw,
                uint16_t count, uint16_t rule_id)
 {
        struct i40e_aq_desc desc;
-       struct i40e_aqc_add_delete_mirror_rule *cmd =
-               (struct i40e_aqc_add_delete_mirror_rule *)&desc.params.raw;
+       struct i40e_aqc_add_delete_mirror_rule cmd;
        uint16_t buff_len = 0;
        enum i40e_status_code status;
        void *buff = NULL;
 
        i40e_fill_default_direct_cmd_desc(&desc,
                                          i40e_aqc_opc_delete_mirror_rule);
-
+       memset(&cmd, 0, sizeof(cmd));
        if (rule_type == I40E_AQC_MIRROR_RULE_TYPE_VLAN) {
                desc.flags |= rte_cpu_to_le_16((uint16_t)(I40E_AQ_FLAG_BUF |
                                                          I40E_AQ_FLAG_RD));
-               cmd->num_entries = count;
+               cmd.num_entries = count;
                buff_len = sizeof(uint16_t) * count;
                desc.datalen = rte_cpu_to_le_16(buff_len);
                buff = (void *)entries;
        } else
                /* rule id is filled in destination field for deleting mirror rule */
-               cmd->destination = rte_cpu_to_le_16(rule_id);
+               cmd.destination = rte_cpu_to_le_16(rule_id);
 
-       cmd->rule_type = rte_cpu_to_le_16(rule_type <<
+       cmd.rule_type = rte_cpu_to_le_16(rule_type <<
                                I40E_AQC_MIRROR_RULE_TYPE_SHIFT);
-       cmd->seid = rte_cpu_to_le_16(seid);
+       cmd.seid = rte_cpu_to_le_16(seid);
 
+       rte_memcpy(&desc.params.raw, &cmd, sizeof(cmd));
        status = i40e_asq_send_command(hw, &desc, buff, buff_len, NULL);
 
        return status;