be2net: fix adaptive interrupt coalescing

The current EQ delay calculation for AIC is based only on RX packet rate.
This fails to be effective when there's only TX and no RX.
This patch inclues:
- Calculating EQ-delay based on both RX and TX pps.
- Modifying EQ-delay of all EQs via one cmd, instead of issuing a separate
  cmd for each EQ.
- A new structure to store interrupt coalescing parameters, in a separate
  cache-line from the EQ-obj.

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 4a540aff698c..e7cbc56a0c8f 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -88,7 +88,7 @@ static inline char *nic_name(struct pci_dev *pdev)
 #define BE_MIN_MTU              256
 
 #define BE_NUM_VLANS_SUPPORTED  64
-#define BE_MAX_EQD              96u
+#define BE_MAX_EQD              128u
 #define BE_MAX_TX_FRAG_COUNT    30
 
 #define EVNT_Q_LEN              1024
@@ -200,6 +200,17 @@ struct be_eq_obj {
         struct be_adapter *adapter;
 } ____cacheline_aligned_in_smp;
 
+struct be_aic_obj {             /* Adaptive interrupt coalescing (AIC) info */
+        bool enable;
+        u32 min_eqd;            /* in usecs */
+        u32 max_eqd;            /* in usecs */
+        u32 prev_eqd;           /* in usecs */
+        u32 et_eqd;             /* configured val when aic is off */
+        ulong jiffies;
+        u64 rx_pkts_prev;       /* Used to calculate RX pps */
+        u64 tx_reqs_prev;       /* Used to calculate TX pps */
+};
+
 struct be_mcc_obj {
         struct be_queue_info q;
         struct be_queue_info cq;
@@ -238,15 +249,12 @@ struct be_rx_page_info {
 struct be_rx_stats {
         u64 rx_bytes;
         u64 rx_pkts;
-        u64 rx_pkts_prev;
-        ulong rx_jiffies;
         u32 rx_drops_no_skbs;   /* skb allocation errors */
         u32 rx_drops_no_frags;  /* HW has no fetched frags */
         u32 rx_post_fail;       /* page post alloc failures */
         u32 rx_compl;
         u32 rx_mcast_pkts;
         u32 rx_compl_err;       /* completions with err set */
-        u32 rx_pps;             /* pkts per second */
         struct u64_stats_sync sync;
 };
 
@@ -403,6 +411,7 @@ struct be_adapter {
         u32 big_page_size;      /* Compounded page size shared by rx wrbs */
 
         struct be_drv_stats drv_stats;
+        struct be_aic_obj aic_obj[MAX_EVT_QS];
         u16 vlans_added;
         u8 vlan_tag[VLAN_N_VID];
         u8 vlan_prio_bmap;      /* Available Priority BitMap */