S2io: Move all the transmit completions to a single msi-x (alarm) vector

- Move all the transmit completions to a single msi-x (alarm) vector.
- Enable the continuous timer interrupt for only one transmit fifo.

Signed-off-by: Santosh Rastapur <santosh.rastapur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

2 files changed, 105 insertions, 70 deletions

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 0f3d230a320d..e161a847c536 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -1220,15 +1220,33 @@ static int init_tti(struct s2io_nic *nic, int link)
                                 TTI_DATA1_MEM_TX_URNG_B(0x10) |
                                 TTI_DATA1_MEM_TX_URNG_C(0x30) |
                                 TTI_DATA1_MEM_TX_TIMER_AC_EN;
-
-                if (use_continuous_tx_intrs && (link == LINK_UP))
-                        val64 |= TTI_DATA1_MEM_TX_TIMER_CI_EN;
+                if (i == 0)
+                        if (use_continuous_tx_intrs && (link == LINK_UP))
+                                val64 |= TTI_DATA1_MEM_TX_TIMER_CI_EN;
                 writeq(val64, &bar0->tti_data1_mem);
 
-                val64 = TTI_DATA2_MEM_TX_UFC_A(0x10) |
-                                TTI_DATA2_MEM_TX_UFC_B(0x20) |
-                                TTI_DATA2_MEM_TX_UFC_C(0x40) |
-                                TTI_DATA2_MEM_TX_UFC_D(0x80);
+                if (nic->config.intr_type == MSI_X) {
+                        val64 = TTI_DATA2_MEM_TX_UFC_A(0x10) |
+                                TTI_DATA2_MEM_TX_UFC_B(0x100) |
+                                TTI_DATA2_MEM_TX_UFC_C(0x200) |
+                                TTI_DATA2_MEM_TX_UFC_D(0x300);
+                } else {
+                        if ((nic->config.tx_steering_type ==
+                                TX_DEFAULT_STEERING) &&
+                                (config->tx_fifo_num > 1) &&
+                                (i >= nic->udp_fifo_idx) &&
+                                (i < (nic->udp_fifo_idx +
+                                nic->total_udp_fifos)))
+                                val64 = TTI_DATA2_MEM_TX_UFC_A(0x50) |
+                                        TTI_DATA2_MEM_TX_UFC_B(0x80) |
+                                        TTI_DATA2_MEM_TX_UFC_C(0x100) |
+                                        TTI_DATA2_MEM_TX_UFC_D(0x120);
+                        else
+                                val64 = TTI_DATA2_MEM_TX_UFC_A(0x10) |
+                                        TTI_DATA2_MEM_TX_UFC_B(0x20) |
+                                        TTI_DATA2_MEM_TX_UFC_C(0x40) |
+                                        TTI_DATA2_MEM_TX_UFC_D(0x80);
+                }
 
                 writeq(val64, &bar0->tti_data2_mem);
 
@@ -3771,7 +3789,7 @@ static void store_xmsi_data(struct s2io_nic *nic)
 static int s2io_enable_msi_x(struct s2io_nic *nic)
 {
         struct XENA_dev_config __iomem *bar0 = nic->bar0;
-        u64 tx_mat, rx_mat;
+        u64 rx_mat;
         u16 msi_control; /* Temp variable */
         int ret, i, j, msix_indx = 1;
 
@@ -3801,22 +3819,19 @@ static int s2io_enable_msi_x(struct s2io_nic *nic)
          nic->mac_control.stats_info->sw_stat.mem_allocated
                 += (MAX_REQUESTED_MSI_X * sizeof(struct s2io_msix_entry));
 
-        for (i=0; i< MAX_REQUESTED_MSI_X; i++) {
+        nic->entries[0].entry = 0;
+        nic->s2io_entries[0].entry = 0;
+        nic->s2io_entries[0].in_use = MSIX_FLG;
+        nic->s2io_entries[0].type = MSIX_ALARM_TYPE;
+        nic->s2io_entries[0].arg = &nic->mac_control.fifos;
+
+        for (i = 1; i < MAX_REQUESTED_MSI_X; i++) {
                 nic->entries[i].entry = i;
                 nic->s2io_entries[i].entry = i;
                 nic->s2io_entries[i].arg = NULL;
                 nic->s2io_entries[i].in_use = 0;
         }
 
-        tx_mat = readq(&bar0->tx_mat0_n[0]);
-        for (i=0; i<nic->config.tx_fifo_num; i++, msix_indx++) {
-                tx_mat |= TX_MAT_SET(i, msix_indx);
-                nic->s2io_entries[msix_indx].arg = &nic->mac_control.fifos[i];
-                nic->s2io_entries[msix_indx].type = MSIX_FIFO_TYPE;
-                nic->s2io_entries[msix_indx].in_use = MSIX_FLG;
-        }
-        writeq(tx_mat, &bar0->tx_mat0_n[0]);
-
         rx_mat = readq(&bar0->rx_mat);
         for (j = 0; j < nic->config.rx_ring_num; j++, msix_indx++) {
                 rx_mat |= RX_MAT_SET(j, msix_indx);
@@ -4353,15 +4368,35 @@ static irqreturn_t s2io_msix_ring_handle(int irq, void *dev_id)
 
 static irqreturn_t s2io_msix_fifo_handle(int irq, void *dev_id)
 {
-        struct fifo_info *fifo = (struct fifo_info *)dev_id;
-        struct s2io_nic *sp = fifo->nic;
+        int i;
+        struct fifo_info *fifos = (struct fifo_info *)dev_id;
+        struct s2io_nic *sp = fifos->nic;
+        struct XENA_dev_config __iomem *bar0 = sp->bar0;
+        struct config_param *config  = &sp->config;
+        u64 reason;
 
-        if (!is_s2io_card_up(sp))
+        if (unlikely(!is_s2io_card_up(sp)))
+                return IRQ_NONE;
+
+        reason = readq(&bar0->general_int_status);
+        if (unlikely(reason == S2IO_MINUS_ONE))
+                /* Nothing much can be done. Get out */
                 return IRQ_HANDLED;
 
-        tx_intr_handler(fifo);
+        writeq(S2IO_MINUS_ONE, &bar0->general_int_mask);
+
+        if (reason & GEN_INTR_TXTRAFFIC)
+                writeq(S2IO_MINUS_ONE, &bar0->tx_traffic_int);
+
+        for (i = 0; i < config->tx_fifo_num; i++)
+                tx_intr_handler(&fifos[i]);
+
+        writeq(sp->general_int_mask, &bar0->general_int_mask);
+        readl(&bar0->general_int_status);
+
         return IRQ_HANDLED;
 }
+
 static void s2io_txpic_intr_handle(struct s2io_nic *sp)
 {
         struct XENA_dev_config __iomem *bar0 = sp->bar0;
@@ -6985,62 +7020,61 @@ static int s2io_add_isr(struct s2io_nic * sp)
 
         /* After proper initialization of H/W, register ISR */
         if (sp->config.intr_type == MSI_X) {
-                int i, msix_tx_cnt=0,msix_rx_cnt=0;
-
-                for (i=1; (sp->s2io_entries[i].in_use == MSIX_FLG); i++) {
-                        if (sp->s2io_entries[i].type == MSIX_FIFO_TYPE) {
-                                sprintf(sp->desc[i], "%s:MSI-X-%d-TX",
+                int i, msix_rx_cnt = 0;
+
+                for (i = 0; (sp->s2io_entries[i].in_use == MSIX_FLG); i++) {
+                        if (sp->s2io_entries[i].type ==
+                                        MSIX_RING_TYPE) {
+                                        sprintf(sp->desc[i], "%s:MSI-X-%d-RX",
+                                                dev->name, i);
+                                        err = request_irq(sp->entries[i].vector,
+                                                s2io_msix_ring_handle, 0,
+                                                sp->desc[i],
+                                                sp->s2io_entries[i].arg);
+                                } else if (sp->s2io_entries[i].type ==
+                                        MSIX_ALARM_TYPE) {
+                                        sprintf(sp->desc[i], "%s:MSI-X-%d-TX",
                                         dev->name, i);
-                                err = request_irq(sp->entries[i].vector,
-                                          s2io_msix_fifo_handle, 0, sp->desc[i],
-                                                  sp->s2io_entries[i].arg);
-                                /* If either data or addr is zero print it */
-                                if(!(sp->msix_info[i].addr &&
-                                        sp->msix_info[i].data)) {
-                                        DBG_PRINT(ERR_DBG, "%s @ Addr:0x%llx "
-                                                "Data:0x%llx\n",sp->desc[i],
-                                                (unsigned long long)
-                                                sp->msix_info[i].addr,
-                                                (unsigned long long)
-                                                sp->msix_info[i].data);
-                                } else {
-                                        msix_tx_cnt++;
+                                        err = request_irq(sp->entries[i].vector,
+                                                s2io_msix_fifo_handle, 0,
+                                                sp->desc[i],
+                                                sp->s2io_entries[i].arg);
+
                                 }
-                        } else {
-                                sprintf(sp->desc[i], "%s:MSI-X-%d-RX",
-                                        dev->name, i);
-                                err = request_irq(sp->entries[i].vector,
-                                          s2io_msix_ring_handle, 0, sp->desc[i],
-                                                  sp->s2io_entries[i].arg);
-                                /* If either data or addr is zero print it */
-                                if(!(sp->msix_info[i].addr &&
+                                /* if either data or addr is zero print it. */
+                                if (!(sp->msix_info[i].addr &&
                                         sp->msix_info[i].data)) {
-                                        DBG_PRINT(ERR_DBG, "%s @ Addr:0x%llx "
-                                                "Data:0x%llx\n",sp->desc[i],
+                                        DBG_PRINT(ERR_DBG,
+                                                "%s @Addr:0x%llx Data:0x%llx\n",
+                                                sp->desc[i],
                                                 (unsigned long long)
                                                 sp->msix_info[i].addr,
                                                 (unsigned long long)
-                                                sp->msix_info[i].data);
-                                } else {
+                                                ntohl(sp->msix_info[i].data));
+                                } else
                                         msix_rx_cnt++;
+                                if (err) {
+                                        remove_msix_isr(sp);
+
+                                        DBG_PRINT(ERR_DBG,
+                                                "%s:MSI-X-%d registration "
+                                                "failed\n", dev->name, i);
+
+                                        DBG_PRINT(ERR_DBG,
+                                                "%s: Defaulting to INTA\n",
+                                                dev->name);
+                                        sp->config.intr_type = INTA;
+                                        break;
                                 }
-                        }
-                        if (err) {
-                                remove_msix_isr(sp);
-                                DBG_PRINT(ERR_DBG,"%s:MSI-X-%d registration "
-                                          "failed\n", dev->name, i);
-                                DBG_PRINT(ERR_DBG, "%s: defaulting to INTA\n",
-                                                 dev->name);
-                                sp->config.intr_type = INTA;
-                                break;
-                        }
-                        sp->s2io_entries[i].in_use = MSIX_REGISTERED_SUCCESS;
+                                sp->s2io_entries[i].in_use =
+                                        MSIX_REGISTERED_SUCCESS;
+
                 }
                 if (!err) {
-                        printk(KERN_INFO "MSI-X-TX %d entries enabled\n",
-                                msix_tx_cnt);
                         printk(KERN_INFO "MSI-X-RX %d entries enabled\n",
-                                msix_rx_cnt);
+                                --msix_rx_cnt);
+                        DBG_PRINT(INFO_DBG, "MSI-X-TX entries enabled"
+                                                " through alarm vector\n");
                 }
         }
         if (sp->config.intr_type == INTA) {
@@ -7218,7 +7252,7 @@ static int s2io_card_up(struct s2io_nic * sp)
         /*  Enable select interrupts */
         en_dis_err_alarms(sp, ENA_ALL_INTRS, ENABLE_INTRS);
         if (sp->config.intr_type != INTA)
-                en_dis_able_nic_intrs(sp, ENA_ALL_INTRS, DISABLE_INTRS);
+                en_dis_able_nic_intrs(sp, TX_TRAFFIC_INTR, ENABLE_INTRS);
         else {
                 interruptible = TX_TRAFFIC_INTR | RX_TRAFFIC_INTR;
                 interruptible |= TX_PIC_INTR;
diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index 0709ebae9139..9a4b772f7411 100644
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -849,8 +849,8 @@ struct s2io_msix_entry
         void *arg;
 
         u8 type;
-#define MSIX_FIFO_TYPE  1
-#define MSIX_RING_TYPE  2
+#define        MSIX_ALARM_TYPE         1
+#define        MSIX_RING_TYPE          2
 
         u8 in_use;
 #define MSIX_REGISTERED_SUCCESS 0xAA
@@ -982,6 +982,7 @@ struct s2io_nic {
         u16             lro_max_aggr_per_sess;
         volatile unsigned long state;
         u64             general_int_mask;
+
 #define VPD_STRING_LEN 80
         u8  product_name[VPD_STRING_LEN];
         u8  serial_num[VPD_STRING_LEN];