cnic: Use union for the status blocks of different devices.

We only need to assign the status block address once and it also saves
space in the structure.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: Eddie Wai <waie@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 23 insertions, 21 deletions

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index 0defe61d5bf3..463408f46ba6 100644
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -900,7 +900,8 @@ static int cnic_alloc_uio(struct cnic_dev *dev) {
         uinfo->mem[0].memtype = UIO_MEM_PHYS;
 
         if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
-                uinfo->mem[1].addr = (unsigned long) cp->status_blk & PAGE_MASK;
+                uinfo->mem[1].addr = (unsigned long) cp->status_blk.gen &
+                        PAGE_MASK;
                 if (cp->ethdev->drv_state & CNIC_DRV_STATE_USING_MSIX)
                         uinfo->mem[1].size = BNX2_SBLK_MSIX_ALIGN_SIZE * 9;
                 else
@@ -1103,10 +1104,9 @@ static int cnic_alloc_bnx2x_resc(struct cnic_dev *dev)
         if (ret)
                 goto error;
 
-        cp->bnx2x_status_blk = cp->status_blk;
         cp->bnx2x_def_status_blk = cp->ethdev->irq_arr[1].status_blk;
 
-        memset(cp->bnx2x_status_blk, 0, sizeof(struct host_status_block));
+        memset(cp->status_blk.bnx2x, 0, sizeof(*cp->status_blk.bnx2x));
 
         cp->l2_rx_ring_size = 15;
 
@@ -2205,7 +2205,7 @@ static void cnic_service_bnx2_msix(unsigned long data)
 {
         struct cnic_dev *dev = (struct cnic_dev *) data;
         struct cnic_local *cp = dev->cnic_priv;
-        struct status_block_msix *status_blk = cp->bnx2_status_blk;
+        struct status_block_msix *status_blk = cp->status_blk.bnx2;
         u32 status_idx = status_blk->status_idx;
         u16 hw_prod, sw_prod;
         int kcqe_cnt;
@@ -2251,7 +2251,7 @@ static irqreturn_t cnic_irq(int irq, void *dev_instance)
         if (cp->ack_int)
                 cp->ack_int(dev);
 
-        prefetch(cp->status_blk);
+        prefetch(cp->status_blk.gen);
         prefetch(&cp->kcq[KCQ_PG(prod)][KCQ_IDX(prod)]);
 
         if (likely(test_bit(CNIC_F_CNIC_UP, &dev->flags)))
@@ -2292,7 +2292,7 @@ static void cnic_service_bnx2x_bh(unsigned long data)
         struct cnic_local *cp = dev->cnic_priv;
         u16 hw_prod, sw_prod;
         struct cstorm_status_block_c *sblk =
-                &cp->bnx2x_status_blk->c_status_block;
+                &cp->status_blk.bnx2x->c_status_block;
         u32 status_idx = sblk->status_block_index;
         int kcqe_cnt;
 
@@ -2334,7 +2334,7 @@ static int cnic_service_bnx2x(void *data, void *status_blk)
         struct cnic_local *cp = dev->cnic_priv;
         u16 prod = cp->kcq_prod_idx & MAX_KCQ_IDX;
 
-        prefetch(cp->status_blk);
+        prefetch(cp->status_blk.bnx2x);
         prefetch(&cp->kcq[KCQ_PG(prod)][KCQ_IDX(prod)]);
 
         if (likely(test_bit(CNIC_F_CNIC_UP, &dev->flags)))
@@ -3409,8 +3409,7 @@ static int cnic_init_bnx2_irq(struct cnic_dev *dev)
                 CNIC_WR(dev, base + BNX2_HC_COM_TICKS_OFF, (64 << 16) | 220);
                 CNIC_WR(dev, base + BNX2_HC_CMD_TICKS_OFF, (64 << 16) | 220);
 
-                cp->bnx2_status_blk = cp->status_blk;
-                cp->last_status_idx = cp->bnx2_status_blk->status_idx;
+                cp->last_status_idx = cp->status_blk.bnx2->status_idx;
                 tasklet_init(&cp->cnic_irq_task, cnic_service_bnx2_msix,
                              (unsigned long) dev);
                 err = request_irq(ethdev->irq_arr[0].vector, cnic_irq, 0,
@@ -3419,7 +3418,7 @@ static int cnic_init_bnx2_irq(struct cnic_dev *dev)
                         tasklet_disable(&cp->cnic_irq_task);
                         return err;
                 }
-                while (cp->bnx2_status_blk->status_completion_producer_index &&
+                while (cp->status_blk.bnx2->status_completion_producer_index &&
                        i < 10) {
                         CNIC_WR(dev, BNX2_HC_COALESCE_NOW,
                                 1 << (11 + sblk_num));
@@ -3427,13 +3426,13 @@ static int cnic_init_bnx2_irq(struct cnic_dev *dev)
                         i++;
                         barrier();
                 }
-                if (cp->bnx2_status_blk->status_completion_producer_index) {
+                if (cp->status_blk.bnx2->status_completion_producer_index) {
                         cnic_free_irq(dev);
                         goto failed;
                 }
 
         } else {
-                struct status_block *sblk = cp->status_blk;
+                struct status_block *sblk = cp->status_blk.gen;
                 u32 hc_cmd = CNIC_RD(dev, BNX2_HC_COMMAND);
                 int i = 0;
 
@@ -3490,7 +3489,7 @@ static void cnic_init_bnx2_tx_ring(struct cnic_dev *dev)
         int i;
         struct tx_bd *txbd;
         dma_addr_t buf_map;
-        struct status_block *s_blk = cp->status_blk;
+        struct status_block *s_blk = cp->status_blk.gen;
 
         sb_id = cp->status_blk_num;
         tx_cid = 20;
@@ -3498,7 +3497,7 @@ static void cnic_init_bnx2_tx_ring(struct cnic_dev *dev)
         cnic_init_context(dev, tx_cid + 1);
         cp->tx_cons_ptr = &s_blk->status_tx_quick_consumer_index2;
         if (ethdev->drv_state & CNIC_DRV_STATE_USING_MSIX) {
-                struct status_block_msix *sblk = cp->status_blk;
+                struct status_block_msix *sblk = cp->status_blk.bnx2;
 
                 tx_cid = TX_TSS_CID + sb_id - 1;
                 cnic_init_context(dev, tx_cid);
@@ -3554,7 +3553,7 @@ static void cnic_init_bnx2_rx_ring(struct cnic_dev *dev)
         u32 cid_addr, sb_id, val, coal_reg, coal_val;
         int i;
         struct rx_bd *rxbd;
-        struct status_block *s_blk = cp->status_blk;
+        struct status_block *s_blk = cp->status_blk.gen;
 
         sb_id = cp->status_blk_num;
         cnic_init_context(dev, 2);
@@ -3562,7 +3561,7 @@ static void cnic_init_bnx2_rx_ring(struct cnic_dev *dev)
         coal_reg = BNX2_HC_COMMAND;
         coal_val = CNIC_RD(dev, coal_reg);
         if (ethdev->drv_state & CNIC_DRV_STATE_USING_MSIX) {
-                struct status_block_msix *sblk = cp->status_blk;
+                struct status_block_msix *sblk = cp->status_blk.bnx2;
 
                 cp->rx_cons_ptr = &sblk->status_rx_quick_consumer_index;
                 coal_reg = BNX2_HC_COALESCE_NOW;
@@ -3661,7 +3660,7 @@ static int cnic_start_bnx2_hw(struct cnic_dev *dev)
 {
         struct cnic_local *cp = dev->cnic_priv;
         struct cnic_eth_dev *ethdev = cp->ethdev;
-        struct status_block *sblk = cp->status_blk;
+        struct status_block *sblk = cp->status_blk.gen;
         u32 val;
         int err;
 
@@ -4250,7 +4249,7 @@ static int cnic_start_hw(struct cnic_dev *dev)
         cp->chip_id = ethdev->chip_id;
         pci_dev_get(dev->pcidev);
         cp->func = PCI_FUNC(dev->pcidev->devfn);
-        cp->status_blk = ethdev->irq_arr[0].status_blk;
+        cp->status_blk.gen = ethdev->irq_arr[0].status_blk;
         cp->status_blk_num = ethdev->irq_arr[0].status_blk_num;
 
         err = cp->alloc_resc(dev);
diff --git a/drivers/net/cnic.h b/drivers/net/cnic.h
index 1921597ab4a3..d566390b8c4d 100644
--- a/drivers/net/cnic.h
+++ b/drivers/net/cnic.h
@@ -224,9 +224,12 @@ struct cnic_local {
         u16             kcq_prod_idx;
         u32             kcq_io_addr;
 
-        void                            *status_blk;
-        struct status_block_msix        *bnx2_status_blk;
-        struct host_status_block        *bnx2x_status_blk;
+        union {
+                void                            *gen;
+                struct status_block_msix        *bnx2;
+                struct host_status_block        *bnx2x;
+        } status_blk;
+
         struct host_def_status_block    *bnx2x_def_status_blk;
 
         u32                             status_blk_num;