Hi,
> -----Original Message-----
> From: Wu, Jingjing
> Sent: Wednesday, July 8, 2015 2:37 PM
> To: dev at dpdk.org
> Cc: Wu, Jingjing; Lu, Wenzhuo
> Subject: [PATCH] i40e: fix the build error with gcc 4.4
>
> Fix the build warning reported like:
> error: dereferencing pointer 'cmd' does break strict-aliasing rules
>
> Signed-off-by: Jingjing Wu <jingjing.wu at intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
> ---
> drivers/net/i40e/i40e_ethdev.c | 27 ++++++++++++++-------------
> 1 file changed, 14 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 02d17b4..dcf91bb 100644
> --- 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;
> --
> 1.9.3
