[PATCH] S2io: Support for bimodal interrupts

Hi,
This is a patch to provide bimodal interrupt moderation support for
Xframe II adapter. Basically, in this moderation scheme, the adapter
raises a traffic interrupt if the no. of packets transmitted and/or
received reaches a programmable threshold.

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 85 insertions, 40 deletions

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 15e2ee9f9703..f430ffe7d6f8 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -297,6 +297,7 @@ static unsigned int mc_pause_threshold_q4q7 = 187;
 static unsigned int shared_splits;
 static unsigned int tmac_util_period = 5;
 static unsigned int rmac_util_period = 5;
+static unsigned int bimodal = 0;
 #ifndef CONFIG_S2IO_NAPI
 static unsigned int indicate_max_pkts;
 #endif
@@ -1306,52 +1307,86 @@ static int init_nic(struct s2io_nic *nic)
                 time++;
         }
 
+        if (nic->config.bimodal) {
+                int k = 0;
+                for (k = 0; k < config->rx_ring_num; k++) {
+                        val64 = TTI_CMD_MEM_WE | TTI_CMD_MEM_STROBE_NEW_CMD;
+                        val64 |= TTI_CMD_MEM_OFFSET(0x38+k);
+                        writeq(val64, &bar0->tti_command_mem);
 
-        /* RTI Initialization */
-        if (nic->device_type == XFRAME_II_DEVICE) {
                 /*
-                 * Programmed to generate Apprx 500 Intrs per
-                 * second
-                 */
-                int count = (nic->config.bus_speed * 125)/4;
-                val64 = RTI_DATA1_MEM_RX_TIMER_VAL(count);
+                 * Once the operation completes, the Strobe bit of the command
+                 * register will be reset. We poll for this particular condition
+                 * We wait for a maximum of 500ms for the operation to complete,
+                 * if it's not complete by then we return error.
+                */
+                        time = 0;
+                        while (TRUE) {
+                                val64 = readq(&bar0->tti_command_mem);
+                                if (!(val64 & TTI_CMD_MEM_STROBE_NEW_CMD)) {
+                                        break;
+                                }
+                                if (time > 10) {
+                                        DBG_PRINT(ERR_DBG,
+                                                "%s: TTI init Failed\n",
+                                        dev->name);
+                                        return -1;
+                                }
+                                time++;
+                                msleep(50);
+                        }
+                }
         } else {
-                val64 = RTI_DATA1_MEM_RX_TIMER_VAL(0xFFF);
-        }
-        val64 |= RTI_DATA1_MEM_RX_URNG_A(0xA) |
-            RTI_DATA1_MEM_RX_URNG_B(0x10) |
-            RTI_DATA1_MEM_RX_URNG_C(0x30) | RTI_DATA1_MEM_RX_TIMER_AC_EN;
 
-        writeq(val64, &bar0->rti_data1_mem);
+                /* RTI Initialization */
+                if (nic->device_type == XFRAME_II_DEVICE) {
+                        /*
+                         * Programmed to generate Apprx 500 Intrs per
+                         * second
+                         */
+                        int count = (nic->config.bus_speed * 125)/4;
+                        val64 = RTI_DATA1_MEM_RX_TIMER_VAL(count);
+                } else {
+                        val64 = RTI_DATA1_MEM_RX_TIMER_VAL(0xFFF);
+                }
+                val64 |= RTI_DATA1_MEM_RX_URNG_A(0xA) |
+                    RTI_DATA1_MEM_RX_URNG_B(0x10) |
+                    RTI_DATA1_MEM_RX_URNG_C(0x30) | RTI_DATA1_MEM_RX_TIMER_AC_EN;
 
-        val64 = RTI_DATA2_MEM_RX_UFC_A(0x1) |
-            RTI_DATA2_MEM_RX_UFC_B(0x2) |
-            RTI_DATA2_MEM_RX_UFC_C(0x40) | RTI_DATA2_MEM_RX_UFC_D(0x80);
-        writeq(val64, &bar0->rti_data2_mem);
+                writeq(val64, &bar0->rti_data1_mem);
 
-        val64 = RTI_CMD_MEM_WE | RTI_CMD_MEM_STROBE_NEW_CMD;
-        writeq(val64, &bar0->rti_command_mem);
+                val64 = RTI_DATA2_MEM_RX_UFC_A(0x1) |
+                    RTI_DATA2_MEM_RX_UFC_B(0x2) |
+                    RTI_DATA2_MEM_RX_UFC_C(0x40) | RTI_DATA2_MEM_RX_UFC_D(0x80);
+                writeq(val64, &bar0->rti_data2_mem);
 
-        /*
-         * Once the operation completes, the Strobe bit of the
-         * command register will be reset. We poll for this
-         * particular condition. We wait for a maximum of 500ms
-         * for the operation to complete, if it's not complete
-         * by then we return error.
-         */
-        time = 0;
-        while (TRUE) {
-                val64 = readq(&bar0->rti_command_mem);
-                if (!(val64 & RTI_CMD_MEM_STROBE_NEW_CMD)) {
-                        break;
-                }
-                if (time > 10) {
-                        DBG_PRINT(ERR_DBG, "%s: RTI init Failed\n",
-                                  dev->name);
-                        return -1;
+                for (i = 0; i < config->rx_ring_num; i++) {
+                        val64 = RTI_CMD_MEM_WE | RTI_CMD_MEM_STROBE_NEW_CMD
+                                        | RTI_CMD_MEM_OFFSET(i);
+                        writeq(val64, &bar0->rti_command_mem);
+
+                        /*
+                         * Once the operation completes, the Strobe bit of the
+                         * command register will be reset. We poll for this
+                         * particular condition. We wait for a maximum of 500ms
+                         * for the operation to complete, if it's not complete
+                         * by then we return error.
+                         */
+                        time = 0;
+                        while (TRUE) {
+                                val64 = readq(&bar0->rti_command_mem);
+                                if (!(val64 & RTI_CMD_MEM_STROBE_NEW_CMD)) {
+                                        break;
+                                }
+                                if (time > 10) {
+                                        DBG_PRINT(ERR_DBG, "%s: RTI init Failed\n",
+                                                  dev->name);
+                                        return -1;
+                                }
+                                time++;
+                                msleep(50);
+                        }
                 }
-                time++;
-                msleep(50);
         }
 
         /*
@@ -1789,6 +1824,8 @@ static int start_nic(struct s2io_nic *nic)
                        &bar0->prc_rxd0_n[i]);
 
                 val64 = readq(&bar0->prc_ctrl_n[i]);
+                if (nic->config.bimodal)
+                        val64 |= PRC_CTRL_BIMODAL_INTERRUPT;
 #ifndef CONFIG_2BUFF_MODE
                 val64 |= PRC_CTRL_RC_ENABLED;
 #else
@@ -5030,6 +5067,7 @@ module_param(mc_pause_threshold_q4q7, int, 0);
 module_param(shared_splits, int, 0);
 module_param(tmac_util_period, int, 0);
 module_param(rmac_util_period, int, 0);
+module_param(bimodal, bool, 0);
 #ifndef CONFIG_S2IO_NAPI
 module_param(indicate_max_pkts, int, 0);
 #endif
@@ -5397,6 +5435,14 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
         else
                 strcat(sp->name, ": Neterion Xframe I 10GbE adapter");
 
+        /* Initialize bimodal Interrupts */
+        sp->config.bimodal = bimodal;
+        if (!(sp->device_type & XFRAME_II_DEVICE) && bimodal) {
+                sp->config.bimodal = 0;
+                DBG_PRINT(ERR_DBG,"%s:Bimodal intr not supported by Xframe I\n",
+                        dev->name);
+        }
+
         /*
          * Make Link state as off at this point, when the Link change
          * interrupt comes the state will be automatically changed to
diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index df8cfd0475be..946314503daa 100644
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -261,8 +261,6 @@ typedef struct stat_block {
         u32 rmac_accepted_ip_oflow;
         u32 reserved_14;
         u32 link_fault_cnt;
-
-/* Software statistics maintained by driver */
         swStat_t sw_stat;
 } StatInfo_t;
 
@@ -349,6 +347,7 @@ struct config_param {
 #define MAX_RX_BLOCKS_PER_RING  150
 
         rx_ring_config_t rx_cfg[MAX_RX_RINGS];  /*Per-Rx Ring config */
+        u8 bimodal;             /*Flag for setting bimodal interrupts*/
 
 #define HEADER_ETHERNET_II_802_3_SIZE 14
 #define HEADER_802_2_SIZE              3