tg3: Make tg3_alloc_rx_skb() a dst-only operation

This patch removes the source index parameter of tg3_alloc_rx_skb().  A
later patch will make it possible for the source and destination
producer rings to be different.  This patch opts to make
tg3_alloc_rx_skb() a destination-only implementation and move the code
sensitive to the difference elsewhere.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 13 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index f0360f8b8f7b..ef6408018d2f 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -4409,7 +4409,7 @@ static void tg3_tx(struct tg3_napi *tnapi)
  * (to fetch the error flags, vlan tag, checksum, and opaque cookie).
  */
 static int tg3_alloc_rx_skb(struct tg3_napi *tnapi, u32 opaque_key,
-                            int src_idx, u32 dest_idx_unmasked)
+                            u32 dest_idx_unmasked)
 {
         struct tg3 *tp = tnapi->tp;
         struct tg3_rx_buffer_desc *desc;
@@ -4425,8 +4425,6 @@ static int tg3_alloc_rx_skb(struct tg3_napi *tnapi, u32 opaque_key,
                 dest_idx = dest_idx_unmasked % TG3_RX_RING_SIZE;
                 desc = &tpr->rx_std[dest_idx];
                 map = &tpr->rx_std_buffers[dest_idx];
-                if (src_idx >= 0)
-                        src_map = &tpr->rx_std_buffers[src_idx];
                 skb_size = tp->rx_pkt_map_sz;
                 break;
 
@@ -4434,8 +4432,6 @@ static int tg3_alloc_rx_skb(struct tg3_napi *tnapi, u32 opaque_key,
                 dest_idx = dest_idx_unmasked % TG3_RX_JUMBO_RING_SIZE;
                 desc = &tpr->rx_jmb[dest_idx].std;
                 map = &tpr->rx_jmb_buffers[dest_idx];
-                if (src_idx >= 0)
-                        src_map = &tpr->rx_jmb_buffers[src_idx];
                 skb_size = TG3_RX_JMB_MAP_SZ;
                 break;
 
@@ -4465,9 +4461,6 @@ static int tg3_alloc_rx_skb(struct tg3_napi *tnapi, u32 opaque_key,
         map->skb = skb;
         pci_unmap_addr_set(map, mapping, mapping);
 
-        if (src_map != NULL)
-                src_map->skb = NULL;
-
         desc->addr_hi = ((u64)mapping >> 32);
         desc->addr_lo = ((u64)mapping & 0xffffffff);
 
@@ -4559,6 +4552,7 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
         work_mask = 0;
         received = 0;
         while (sw_idx != hw_idx && budget > 0) {
+                struct ring_info *ri;
                 struct tg3_rx_buffer_desc *desc = &tnapi->rx_rcb[sw_idx];
                 unsigned int len;
                 struct sk_buff *skb;
@@ -4568,13 +4562,13 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
                 desc_idx = desc->opaque & RXD_OPAQUE_INDEX_MASK;
                 opaque_key = desc->opaque & RXD_OPAQUE_RING_MASK;
                 if (opaque_key == RXD_OPAQUE_RING_STD) {
-                        struct ring_info *ri = &tpr->rx_std_buffers[desc_idx];
+                        ri = &tpr->rx_std_buffers[desc_idx];
                         dma_addr = pci_unmap_addr(ri, mapping);
                         skb = ri->skb;
                         post_ptr = &tpr->rx_std_ptr;
                         rx_std_posted++;
                 } else if (opaque_key == RXD_OPAQUE_RING_JUMBO) {
-                        struct ring_info *ri = &tpr->rx_jmb_buffers[desc_idx];
+                        ri = &tpr->rx_jmb_buffers[desc_idx];
                         dma_addr = pci_unmap_addr(ri, mapping);
                         skb = ri->skb;
                         post_ptr = &tpr->rx_jmb_ptr;
@@ -4607,10 +4601,12 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
                         int skb_size;
 
                         skb_size = tg3_alloc_rx_skb(tnapi, opaque_key,
-                                                    desc_idx, *post_ptr);
+                                                    *post_ptr);
                         if (skb_size < 0)
                                 goto drop_it;
 
+                        ri->skb = NULL;
+
                         pci_unmap_single(tp->pdev, dma_addr, skb_size,
                                          PCI_DMA_FROMDEVICE);
 
@@ -5774,7 +5770,7 @@ static int tg3_rx_prodring_alloc(struct tg3 *tp,
 
         /* Now allocate fresh SKBs for each rx ring. */
         for (i = 0; i < tp->rx_pending; i++) {
-                if (tg3_alloc_rx_skb(tnapi, RXD_OPAQUE_RING_STD, -1, i) < 0) {
+                if (tg3_alloc_rx_skb(tnapi, RXD_OPAQUE_RING_STD, i) < 0) {
                         printk(KERN_WARNING PFX
                                "%s: Using a smaller RX standard ring, "
                                "only %d out of %d buffers were allocated "
@@ -5806,7 +5802,7 @@ static int tg3_rx_prodring_alloc(struct tg3 *tp,
 
                 for (i = 0; i < tp->rx_jumbo_pending; i++) {
                         if (tg3_alloc_rx_skb(tnapi, RXD_OPAQUE_RING_JUMBO,
-                                             -1, i) < 0) {
+                                             i) < 0) {
                                 printk(KERN_WARNING PFX
                                        "%s: Using a smaller RX jumbo ring, "
                                        "only %d out of %d buffers were "