#include "ixgbe_dcb_82598.h"
#include "ixgbe_dcb_82599.h"
-/**
- * ixgbe_dcb_config - Struct containing DCB settings.
- * @dcb_config: Pointer to DCB config structure
- *
- * This function checks DCB rules for DCB settings.
- * The following rules are checked:
- * 1. The sum of bandwidth percentages of all Bandwidth Groups must total 100%.
- * 2. The sum of bandwidth percentages of all Traffic Classes within a Bandwidth
- * Group must total 100.
- * 3. A Traffic Class should not be set to both Link Strict Priority
- * and Group Strict Priority.
- * 4. Link strict Bandwidth Groups can only have link strict traffic classes
- * with zero bandwidth.
- */
-s32 ixgbe_dcb_check_config(struct ixgbe_dcb_config *dcb_config)
-{
- struct tc_bw_alloc *p;
- s32 ret_val = 0;
- u8 i, j, bw = 0, bw_id;
- u8 bw_sum[2][MAX_BW_GROUP];
- bool link_strict[2][MAX_BW_GROUP];
-
- memset(bw_sum, 0, sizeof(bw_sum));
- memset(link_strict, 0, sizeof(link_strict));
-
- /* First Tx, then Rx */
- for (i = 0; i < 2; i++) {
- /* Check each traffic class for rule violation */
- for (j = 0; j < MAX_TRAFFIC_CLASS; j++) {
- p = &dcb_config->tc_config[j].path[i];
-
- bw = p->bwg_percent;
- bw_id = p->bwg_id;
-
- if (bw_id >= MAX_BW_GROUP) {
- ret_val = DCB_ERR_CONFIG;
- goto err_config;
- }
- if (p->prio_type == prio_link) {
- link_strict[i][bw_id] = true;
- /* Link strict should have zero bandwidth */
- if (bw) {
- ret_val = DCB_ERR_LS_BW_NONZERO;
- goto err_config;
- }
- } else if (!bw) {
- /*
- * Traffic classes without link strict
- * should have non-zero bandwidth.
- */
- ret_val = DCB_ERR_TC_BW_ZERO;
- goto err_config;
- }
- bw_sum[i][bw_id] += bw;
- }
-
- bw = 0;
-
- /* Check each bandwidth group for rule violation */
- for (j = 0; j < MAX_BW_GROUP; j++) {
- bw += dcb_config->bw_percentage[i][j];
- /*
- * Sum of bandwidth percentages of all traffic classes
- * within a Bandwidth Group must total 100 except for
- * link strict group (zero bandwidth).
- */
- if (link_strict[i][j]) {
- if (bw_sum[i][j]) {
- /*
- * Link strict group should have zero
- * bandwidth.
- */
- ret_val = DCB_ERR_LS_BWG_NONZERO;
- goto err_config;
- }
- } else if (bw_sum[i][j] != BW_PERCENT &&
- bw_sum[i][j] != 0) {
- ret_val = DCB_ERR_TC_BW;
- goto err_config;
- }
- }
-
- if (bw != BW_PERCENT) {
- ret_val = DCB_ERR_BW_GROUP;
- goto err_config;
- }
- }
-
-err_config:
- return ret_val;
-}
-
/**
* ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits
* @ixgbe_dcb_config: Struct containing DCB settings.
* ixgbe_dcb_check_config().
*/
s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *dcb_config,
- u8 direction)
+ int max_frame, u8 direction)
{
struct tc_bw_alloc *p;
+ int min_credit;
+ int min_multiplier;
+ int min_percent = 100;
s32 ret_val = 0;
/* Initialization values default for Tx settings */
u32 credit_refill = 0;
goto out;
}
+ min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
+ DCB_CREDIT_QUANTUM;
+
+ /* Find smallest link percentage */
+ for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+ p = &dcb_config->tc_config[i].path[direction];
+ bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
+ link_percentage = p->bwg_percent;
+
+ link_percentage = (link_percentage * bw_percent) / 100;
+
+ if (link_percentage && link_percentage < min_percent)
+ min_percent = link_percentage;
+ }
+
+ /*
+ * The ratio between traffic classes will control the bandwidth
+ * percentages seen on the wire. To calculate this ratio we use
+ * a multiplier. It is required that the refill credits must be
+ * larger than the max frame size so here we find the smallest
+ * multiplier that will allow all bandwidth percentages to be
+ * greater than the max frame size.
+ */
+ min_multiplier = (min_credit / min_percent) + 1;
+
/* Find out the link percentage for each TC first */
for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
p = &dcb_config->tc_config[i].path[direction];
/* Save link_percentage for reference */
p->link_percent = (u8)link_percentage;
- /* Calculate credit refill and save it */
- credit_refill = link_percentage * MINIMUM_CREDIT_REFILL;
+ /* Calculate credit refill ratio using multiplier */
+ credit_refill = min(link_percentage * min_multiplier,
+ MAX_CREDIT_REFILL);
p->data_credits_refill = (u16)credit_refill;
/* Calculate maximum credit for the TC */
* of a TC is too small, the maximum credit may not be
* enough to send out a jumbo frame in data plane arbitration.
*/
- if (credit_max && (credit_max < MINIMUM_CREDIT_FOR_JUMBO))
- credit_max = MINIMUM_CREDIT_FOR_JUMBO;
+ if (credit_max && (credit_max < min_credit))
+ credit_max = min_credit;
if (direction == DCB_TX_CONFIG) {
/*
return ret_val;
}
-/**
- * ixgbe_dcb_get_tc_stats - Returns status of each traffic class
- * @hw: pointer to hardware structure
- * @stats: pointer to statistics structure
- * @tc_count: Number of elements in bwg_array.
- *
- * This function returns the status data for each of the Traffic Classes in use.
- */
-s32 ixgbe_dcb_get_tc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
- u8 tc_count)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_get_tc_stats_82598(hw, stats, tc_count);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_get_tc_stats_82599(hw, stats, tc_count);
- return ret;
-}
-
-/**
- * ixgbe_dcb_get_pfc_stats - Returns CBFC status of each traffic class
- * hw - pointer to hardware structure
- * stats - pointer to statistics structure
- * tc_count - Number of elements in bwg_array.
- *
- * This function returns the CBFC status data for each of the Traffic Classes.
- */
-s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats,
- u8 tc_count)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_get_pfc_stats_82598(hw, stats, tc_count);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_get_pfc_stats_82599(hw, stats, tc_count);
- return ret;
-}
-
-/**
- * ixgbe_dcb_config_rx_arbiter - Config Rx arbiter
- * @hw: pointer to hardware structure
- * @dcb_config: pointer to ixgbe_dcb_config structure
- *
- * Configure Rx Data Arbiter and credits for each traffic class.
- */
-s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *hw,
- struct ixgbe_dcb_config *dcb_config)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_config_rx_arbiter_82598(hw, dcb_config);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_config_rx_arbiter_82599(hw, dcb_config);
- return ret;
-}
-
-/**
- * ixgbe_dcb_config_tx_desc_arbiter - Config Tx Desc arbiter
- * @hw: pointer to hardware structure
- * @dcb_config: pointer to ixgbe_dcb_config structure
- *
- * Configure Tx Descriptor Arbiter and credits for each traffic class.
- */
-s32 ixgbe_dcb_config_tx_desc_arbiter(struct ixgbe_hw *hw,
- struct ixgbe_dcb_config *dcb_config)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_config_tx_desc_arbiter_82598(hw, dcb_config);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_config_tx_desc_arbiter_82599(hw, dcb_config);
- return ret;
-}
-
-/**
- * ixgbe_dcb_config_tx_data_arbiter - Config Tx data arbiter
- * @hw: pointer to hardware structure
- * @dcb_config: pointer to ixgbe_dcb_config structure
- *
- * Configure Tx Data Arbiter and credits for each traffic class.
- */
-s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *hw,
- struct ixgbe_dcb_config *dcb_config)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_config_tx_data_arbiter_82598(hw, dcb_config);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_config_tx_data_arbiter_82599(hw, dcb_config);
- return ret;
-}
-
-/**
- * ixgbe_dcb_config_pfc - Config priority flow control
- * @hw: pointer to hardware structure
- * @dcb_config: pointer to ixgbe_dcb_config structure
- *
- * Configure Priority Flow Control for each traffic class.
- */
-s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *hw,
- struct ixgbe_dcb_config *dcb_config)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_config_pfc_82598(hw, dcb_config);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_config_pfc_82599(hw, dcb_config);
- return ret;
-}
-
-/**
- * ixgbe_dcb_config_tc_stats - Config traffic class statistics
- * @hw: pointer to hardware structure
- *
- * Configure queue statistics registers, all queues belonging to same traffic
- * class uses a single set of queue statistics counters.
- */
-s32 ixgbe_dcb_config_tc_stats(struct ixgbe_hw *hw)
-{
- s32 ret = 0;
- if (hw->mac.type == ixgbe_mac_82598EB)
- ret = ixgbe_dcb_config_tc_stats_82598(hw);
- else if (hw->mac.type == ixgbe_mac_82599EB)
- ret = ixgbe_dcb_config_tc_stats_82599(hw);
- return ret;
-}
-
/**
* ixgbe_dcb_hw_config - Config and enable DCB
* @hw: pointer to hardware structure
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