sky2: size status ring based on Tx/Rx ring

Sky2 status ring must be big enough to handle worst case number
of status messages. It was being oversized (to handle dual port cards),
and excessive number of tx ring entries were allowed. This patch reduces
the footprint and makes sure the value is enough.

Later patch to add RSS increases the number of possible Rx status elements.
Signed-off-by: NStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/sky2.c

@@ -70,18 +70,15 @@
    VLAN:GSO + CKSUM + Data + skb_frags * DMA */
 #define MAX_SKB_TX_LE	(2 + (sizeof(dma_addr_t)/sizeof(u32))*(MAX_SKB_FRAGS+1))
 #define TX_MIN_PENDING		(MAX_SKB_TX_LE+1)
-#define TX_MAX_PENDING		4096
+#define TX_MAX_PENDING		1024
 #define TX_DEF_PENDING		127
 
-#define STATUS_RING_SIZE	2048	/* 2 ports * (TX + 2*RX) */
-#define STATUS_LE_BYTES		(STATUS_RING_SIZE*sizeof(struct sky2_status_le))
 #define TX_WATCHDOG		(5 * HZ)
 #define NAPI_WEIGHT		64
 #define PHY_RETRIES		1000
 
 #define SKY2_EEPROM_MAGIC	0x9955aabb
 
-
 #define RING_NEXT(x,s)	(((x)+1) & ((s)-1))
 
 static const u32 default_msg =
@@ -2558,7 +2555,7 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
 		if (!(opcode & HW_OWNER))
 			break;
 
-		hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE);
+		hw->st_idx = RING_NEXT(hw->st_idx, hw->st_size);
 
 		port = le->css & CSS_LINK_BIT;
 		dev = hw->dev[port];
@@ -3198,7 +3195,7 @@ static void sky2_reset(struct sky2_hw *hw)
 	for (i = 0; i < hw->ports; i++)
 		sky2_gmac_reset(hw, i);
 
-	memset(hw->st_le, 0, STATUS_LE_BYTES);
+	memset(hw->st_le, 0, hw->st_size * sizeof(struct sky2_status_le));
 	hw->st_idx = 0;
 
 	sky2_write32(hw, STAT_CTRL, SC_STAT_RST_SET);
@@ -3208,7 +3205,7 @@ static void sky2_reset(struct sky2_hw *hw)
 	sky2_write32(hw, STAT_LIST_ADDR_HI, (u64) hw->st_dma >> 32);
 
 	/* Set the list last index */
-	sky2_write16(hw, STAT_LAST_IDX, STATUS_RING_SIZE - 1);
+	sky2_write16(hw, STAT_LAST_IDX, hw->st_size - 1);
 
 	sky2_write16(hw, STAT_TX_IDX_TH, 10);
 	sky2_write8(hw, STAT_FIFO_WM, 16);
@@ -4256,12 +4253,13 @@ static int sky2_debug_show(struct seq_file *seq, void *v)
 	napi_disable(&hw->napi);
 	last = sky2_read16(hw, STAT_PUT_IDX);
 
+	seq_printf(seq, "Status ring %u\n", hw->st_size);
 	if (hw->st_idx == last)
 		seq_puts(seq, "Status ring (empty)\n");
 	else {
 		seq_puts(seq, "Status ring\n");
-		for (idx = hw->st_idx; idx != last && idx < STATUS_RING_SIZE;
-		     idx = RING_NEXT(idx, STATUS_RING_SIZE)) {
+		for (idx = hw->st_idx; idx != last && idx < hw->st_size;
+		     idx = RING_NEXT(idx, hw->st_size)) {
 			const struct sky2_status_le *le = hw->st_le + idx;
 			seq_printf(seq, "[%d] %#x %d %#x\n",
 				   idx, le->opcode, le->length, le->status);
@@ -4689,15 +4687,17 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
 		goto err_out_free_hw;
 	}
 
-	/* ring for status responses */
-	hw->st_le = pci_alloc_consistent(pdev, STATUS_LE_BYTES, &hw->st_dma);
-	if (!hw->st_le)
-		goto err_out_iounmap;
-
 	err = sky2_init(hw);
 	if (err)
 		goto err_out_iounmap;
 
+	/* ring for status responses */
+	hw->st_size = hw->ports * roundup_pow_of_two(2*RX_MAX_PENDING + TX_MAX_PENDING);
+	hw->st_le = pci_alloc_consistent(pdev, hw->st_size * sizeof(struct sky2_status_le),
+					 &hw->st_dma);
+	if (!hw->st_le)
+		goto err_out_reset;
+
 	dev_info(&pdev->dev, "Yukon-2 %s chip revision %d\n",
 		 sky2_name(hw->chip_id, buf1, sizeof(buf1)), hw->chip_rev);
 
@@ -4771,8 +4771,10 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
 err_out_free_netdev:
 	free_netdev(dev);
 err_out_free_pci:
+	pci_free_consistent(pdev, hw->st_size * sizeof(struct sky2_status_le),
+			    hw->st_le, hw->st_dma);
+err_out_reset:
 	sky2_write8(hw, B0_CTST, CS_RST_SET);
-	pci_free_consistent(pdev, STATUS_LE_BYTES, hw->st_le, hw->st_dma);
 err_out_iounmap:
 	iounmap(hw->regs);
 err_out_free_hw:
@@ -4810,7 +4812,8 @@ static void __devexit sky2_remove(struct pci_dev *pdev)
 	free_irq(pdev->irq, hw);
 	if (hw->flags & SKY2_HW_USE_MSI)
 		pci_disable_msi(pdev);
-	pci_free_consistent(pdev, STATUS_LE_BYTES, hw->st_le, hw->st_dma);
+	pci_free_consistent(pdev, hw->st_size * sizeof(struct sky2_status_le),
+			    hw->st_le, hw->st_dma);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 

drivers/net/sky2.h

@@ -2268,6 +2268,7 @@ struct sky2_hw {
 	u8		     ports;
 
 	struct sky2_status_le *st_le;
+	u32		     st_size;
 	u32		     st_idx;
 	dma_addr_t   	     st_dma;