net/i40e: add comment and clean code for flow RSS

This patch add comment for flow rss parse function in order
to explain some important info. This patch also delete some
useless code for queue index check for RSS queue region
configuration.

Fixes: ecad87d22383 ("net/i40e: move RSS to flow API")
Cc: stable@dpdk.org
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Tested-by: Yuan Peng <yuan.peng@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index f4d08bb2472bac2a5773c76d368ab7ce6302d82a..5f78a1516013628c6fd98533482746a0b2be8006 100644 (file)
--- a/drivers/net/i40e/i40e_flow.c
+++ b/drivers/net/i40e/i40e_flow.c
@@ -4171,6 +4171,19 @@ i40e_flow_parse_rss_pattern(__rte_unused struct rte_eth_dev *dev,
        return 0;
 }
 
+/**
+ * This function is used to parse rss queue index, total queue number and
+ * hash functions, If the purpose of this configuration is for queue region
+ * configuration, it will set queue_region_conf flag to TRUE, else to FALSE.
+ * In queue region configuration, it also need to parse hardware flowtype
+ * and user_priority from configuration, it will also cheeck the validity
+ * of these parameters. For example, The queue region sizes should
+ * be any of the following values: 1, 2, 4, 8, 16, 32, 64, the
+ * hw_flowtype or PCTYPE max index should be 63, the user priority
+ * max index should be 7, and so on. And also, queue index should be
+ * continuous sequence and queue region index should be part of rss
+ * queue index for this port.
+ */
 static int
 i40e_flow_parse_rss_action(struct rte_eth_dev *dev,
                            const struct rte_flow_action *actions,
@@ -4216,6 +4229,12 @@ i40e_flow_parse_rss_action(struct rte_eth_dev *dev,
                }
        }
 
+       /**
+        * Do some queue region related parameters check
+        * in order to keep queue index for queue region to be
+        * continuous sequence and also to be part of RSS
+        * queue index for this port.
+        */
        if (conf_info->queue_region_number) {
                for (i = 0; i < rss->num; i++) {
                        for (j = 0; j < rss_info->num; j++) {
@@ -4242,6 +4261,7 @@ i40e_flow_parse_rss_action(struct rte_eth_dev *dev,
                }
        }
 
+       /* Parse queue region related parameters from configuration */
        for (n = 0; n < conf_info->queue_region_number; n++) {
                if (conf_info->region[n].user_priority_num ||
                                conf_info->region[n].flowtype_num) {
@@ -4264,17 +4284,6 @@ i40e_flow_parse_rss_action(struct rte_eth_dev *dev,
                                return -rte_errno;
                        }
 
-                       if (rss_info->num < rss->num ||
-                               rss->queue[0] < rss_info->queue[0] ||
-                               (rss->queue[0] + rss->num >
-                                       rss_info->num + rss_info->queue[0])) {
-                               rte_flow_error_set(error, EINVAL,
-                                       RTE_FLOW_ERROR_TYPE_ACTION,
-                                       act,
-                                       "no valid queues");
-                               return -rte_errno;
-                       }
-
                        for (i = 0; i < info->queue_region_number; i++) {
                                if (info->region[i].queue_num == rss->num &&
                                        info->region[i].queue_start_index ==
@@ -4329,6 +4338,9 @@ i40e_flow_parse_rss_action(struct rte_eth_dev *dev,
                rss_config->queue_region_conf = TRUE;
        }
 
+       /**
+        * Return function if this flow is used for queue region configuration
+        */
        if (rss_config->queue_region_conf)
                return 0;
 
@@ -4349,6 +4361,8 @@ i40e_flow_parse_rss_action(struct rte_eth_dev *dev,
                        return -rte_errno;
                }
        }
+
+       /* Parse RSS related parameters from configuration */
        if (rss->rss_conf)
                rss_config->rss_conf = *rss->rss_conf;
        else