qla3xxx: Dynamically size the rx buffer queue based on the MTU.

This change removes use of constants for rx buffer queue size
and instead calculates the queue length based on what he MTU
is set to.

Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

Author: Ron Mercer

drivers/net/qla3xxx.c

@@ -1700,11 +1700,11 @@ static void ql_update_lrg_bufq_prod_index(struct ql3_adapter *qdev)
 
 			qdev->lrg_buf_q_producer_index++;
 
-			if (qdev->lrg_buf_q_producer_index == NUM_LBUFQ_ENTRIES)
+			if (qdev->lrg_buf_q_producer_index == qdev->num_lbufq_entries)
 				qdev->lrg_buf_q_producer_index = 0;
 
 			if (qdev->lrg_buf_q_producer_index ==
-			    (NUM_LBUFQ_ENTRIES - 1)) {
+			    (qdev->num_lbufq_entries - 1)) {
 				lrg_buf_q_ele = qdev->lrg_buf_q_virt_addr;
 			}
 		}
@@ -1785,7 +1785,7 @@ static void ql_process_mac_rx_intr(struct ql3_adapter *qdev,
 		lrg_buf_phy_addr_low = le32_to_cpu(*curr_ial_ptr);
 		lrg_buf_cb1 = &qdev->lrg_buf[qdev->lrg_buf_index];
 		qdev->lrg_buf_release_cnt++;
-		if (++qdev->lrg_buf_index == NUM_LARGE_BUFFERS) {
+		if (++qdev->lrg_buf_index == qdev->num_large_buffers) {
 			qdev->lrg_buf_index = 0;
 		}
 		curr_ial_ptr++;	/* 64-bit pointers require two incs. */
@@ -1800,7 +1800,7 @@ static void ql_process_mac_rx_intr(struct ql3_adapter *qdev,
 	 * Second buffer gets sent up the stack.
 	 */
 	qdev->lrg_buf_release_cnt++;
-	if (++qdev->lrg_buf_index == NUM_LARGE_BUFFERS)
+	if (++qdev->lrg_buf_index == qdev->num_large_buffers)
 		qdev->lrg_buf_index = 0;
 	skb = lrg_buf_cb2->skb;
 
@@ -1855,7 +1855,7 @@ static void ql_process_macip_rx_intr(struct ql3_adapter *qdev,
 		lrg_buf_phy_addr_low = le32_to_cpu(*curr_ial_ptr);
 		lrg_buf_cb1 = &qdev->lrg_buf[qdev->lrg_buf_index];
 		qdev->lrg_buf_release_cnt++;
-		if (++qdev->lrg_buf_index == NUM_LARGE_BUFFERS)
+		if (++qdev->lrg_buf_index == qdev->num_large_buffers)
 			qdev->lrg_buf_index = 0;
 		skb1 = lrg_buf_cb1->skb;
 		curr_ial_ptr++;	/* 64-bit pointers require two incs. */
@@ -1870,7 +1870,7 @@ static void ql_process_macip_rx_intr(struct ql3_adapter *qdev,
 	lrg_buf_cb2 = &qdev->lrg_buf[qdev->lrg_buf_index];
 	skb2 = lrg_buf_cb2->skb;
 	qdev->lrg_buf_release_cnt++;
-	if (++qdev->lrg_buf_index == NUM_LARGE_BUFFERS)
+	if (++qdev->lrg_buf_index == qdev->num_large_buffers)
 		qdev->lrg_buf_index = 0;
 
 	skb_put(skb2, length);	/* Just the second buffer length here. */
@@ -2347,12 +2347,19 @@ static int ql_alloc_buffer_queues(struct ql3_adapter *qdev)
 {
 	/* Create Large Buffer Queue */
 	qdev->lrg_buf_q_size =
-	    NUM_LBUFQ_ENTRIES * sizeof(struct lrg_buf_q_entry);
+	    qdev->num_lbufq_entries * sizeof(struct lrg_buf_q_entry);
 	if (qdev->lrg_buf_q_size < PAGE_SIZE)
 		qdev->lrg_buf_q_alloc_size = PAGE_SIZE;
 	else
 		qdev->lrg_buf_q_alloc_size = qdev->lrg_buf_q_size * 2;
 
+	qdev->lrg_buf = kmalloc(qdev->num_large_buffers * sizeof(struct ql_rcv_buf_cb),GFP_KERNEL);
+	if (qdev->lrg_buf == NULL) {
+		printk(KERN_ERR PFX
+		       "%s: qdev->lrg_buf alloc failed.\n", qdev->ndev->name);
+		return -ENOMEM;
+	}
+	
 	qdev->lrg_buf_q_alloc_virt_addr =
 	    pci_alloc_consistent(qdev->pdev,
 				 qdev->lrg_buf_q_alloc_size,
@@ -2402,6 +2409,7 @@ static void ql_free_buffer_queues(struct ql3_adapter *qdev)
 		       "%s: Already done.\n", qdev->ndev->name);
 		return;
 	}
+	if(qdev->lrg_buf) kfree(qdev->lrg_buf);
 
 	pci_free_consistent(qdev->pdev,
 			    qdev->lrg_buf_q_alloc_size,
@@ -2485,7 +2493,7 @@ static void ql_free_large_buffers(struct ql3_adapter *qdev)
 	int i = 0;
 	struct ql_rcv_buf_cb *lrg_buf_cb;
 
-	for (i = 0; i < NUM_LARGE_BUFFERS; i++) {
+	for (i = 0; i < qdev->num_large_buffers; i++) {
 		lrg_buf_cb = &qdev->lrg_buf[i];
 		if (lrg_buf_cb->skb) {
 			dev_kfree_skb(lrg_buf_cb->skb);
@@ -2506,7 +2514,7 @@ static void ql_init_large_buffers(struct ql3_adapter *qdev)
 	struct ql_rcv_buf_cb *lrg_buf_cb;
 	struct bufq_addr_element *buf_addr_ele = qdev->lrg_buf_q_virt_addr;
 
-	for (i = 0; i < NUM_LARGE_BUFFERS; i++) {
+	for (i = 0; i < qdev->num_large_buffers; i++) {
 		lrg_buf_cb = &qdev->lrg_buf[i];
 		buf_addr_ele->addr_high = lrg_buf_cb->buf_phy_addr_high;
 		buf_addr_ele->addr_low = lrg_buf_cb->buf_phy_addr_low;
@@ -2523,7 +2531,7 @@ static int ql_alloc_large_buffers(struct ql3_adapter *qdev)
 	struct sk_buff *skb;
 	u64 map;
 
-	for (i = 0; i < NUM_LARGE_BUFFERS; i++) {
+	for (i = 0; i < qdev->num_large_buffers; i++) {
 		skb = netdev_alloc_skb(qdev->ndev,
 				       qdev->lrg_buffer_len);
 		if (unlikely(!skb)) {
@@ -2602,16 +2610,23 @@ static int ql_create_send_free_list(struct ql3_adapter *qdev)
 
 static int ql_alloc_mem_resources(struct ql3_adapter *qdev)
 {
-	if (qdev->ndev->mtu == NORMAL_MTU_SIZE)
+	if (qdev->ndev->mtu == NORMAL_MTU_SIZE) {
+		qdev->num_lbufq_entries = NUM_LBUFQ_ENTRIES;
 		qdev->lrg_buffer_len = NORMAL_MTU_SIZE;
+	}
 	else if (qdev->ndev->mtu == JUMBO_MTU_SIZE) {
+		/*
+		 * Bigger buffers, so less of them.
+		 */
+		qdev->num_lbufq_entries = JUMBO_NUM_LBUFQ_ENTRIES;
 		qdev->lrg_buffer_len = JUMBO_MTU_SIZE;
 	} else {
 		printk(KERN_ERR PFX
 		       "%s: Invalid mtu size.  Only 1500 and 9000 are accepted.\n",
 		       qdev->ndev->name);
 		return -ENOMEM;
 	}
+	qdev->num_large_buffers = qdev->num_lbufq_entries * QL_ADDR_ELE_PER_BUFQ_ENTRY;
 	qdev->lrg_buffer_len += VLAN_ETH_HLEN + VLAN_ID_LEN + QL_HEADER_SPACE;
 	qdev->max_frame_size =
 	    (qdev->lrg_buffer_len - QL_HEADER_SPACE) + ETHERNET_CRC_SIZE;
@@ -2844,7 +2859,7 @@ static int ql_adapter_initialize(struct ql3_adapter *qdev)
 			   &hmem_regs->rxLargeQBaseAddrLow,
 			   LS_64BITS(qdev->lrg_buf_q_phy_addr));
 
-	ql_write_page1_reg(qdev, &hmem_regs->rxLargeQLength, NUM_LBUFQ_ENTRIES);
+	ql_write_page1_reg(qdev, &hmem_regs->rxLargeQLength, qdev->num_lbufq_entries);
 
 	ql_write_page1_reg(qdev,
 			   &hmem_regs->rxLargeBufferLength,
@@ -2866,7 +2881,7 @@ static int ql_adapter_initialize(struct ql3_adapter *qdev)
 
 	qdev->small_buf_q_producer_index = NUM_SBUFQ_ENTRIES - 1;
 	qdev->small_buf_release_cnt = 8;
-	qdev->lrg_buf_q_producer_index = NUM_LBUFQ_ENTRIES - 1;
+	qdev->lrg_buf_q_producer_index = qdev->num_lbufq_entries - 1;
 	qdev->lrg_buf_release_cnt = 8;
 	qdev->lrg_buf_next_free =
 	    (struct bufq_addr_element *)qdev->lrg_buf_q_virt_addr;

drivers/net/qla3xxx.h

@@ -1014,13 +1014,15 @@ struct eeprom_data {
 
 /* Transmit and Receive Buffers */
 #define NUM_LBUFQ_ENTRIES   	128
+#define JUMBO_NUM_LBUFQ_ENTRIES   	\
+(NUM_LBUFQ_ENTRIES/(JUMBO_MTU_SIZE/NORMAL_MTU_SIZE))
 #define NUM_SBUFQ_ENTRIES   	64
 #define QL_SMALL_BUFFER_SIZE    32
 #define QL_ADDR_ELE_PER_BUFQ_ENTRY \
 (sizeof(struct lrg_buf_q_entry) / sizeof(struct bufq_addr_element))
     /* Each send has at least control block.  This is how many we keep. */
 #define NUM_SMALL_BUFFERS     	NUM_SBUFQ_ENTRIES * QL_ADDR_ELE_PER_BUFQ_ENTRY
-#define NUM_LARGE_BUFFERS     	NUM_LBUFQ_ENTRIES * QL_ADDR_ELE_PER_BUFQ_ENTRY
+
 #define QL_HEADER_SPACE 32	/* make header space at top of skb. */
 /*
  * Large & Small Buffers for Receives
@@ -1207,9 +1209,11 @@ struct ql3_adapter {
 	u32 lrg_buf_q_producer_index;
 	u32 lrg_buf_release_cnt;
 	struct bufq_addr_element *lrg_buf_next_free;
+	u32 num_large_buffers;
+	u32 num_lbufq_entries;
 
 	/* Large (Receive) Buffers */
-	struct ql_rcv_buf_cb lrg_buf[NUM_LARGE_BUFFERS];
+	struct ql_rcv_buf_cb *lrg_buf;
 	struct ql_rcv_buf_cb *lrg_buf_free_head;
 	struct ql_rcv_buf_cb *lrg_buf_free_tail;
 	u32 lrg_buf_free_count;