[TG3]: add variable buffer size for standard ring

Add a new rx_pkt_buf_sz to the tg3 structure to support variable buffer
sizes on the standard ring.

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

2 files changed, 10 insertions, 3 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 9188a9b3ba2e..eca4b91454c0 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -2621,7 +2621,7 @@ static int tg3_alloc_rx_skb(struct tg3 *tp, u32 opaque_key,
                 map = &tp->rx_std_buffers[dest_idx];
                 if (src_idx >= 0)
                         src_map = &tp->rx_std_buffers[src_idx];
-                skb_size = RX_PKT_BUF_SZ;
+                skb_size = tp->rx_pkt_buf_sz;
                 break;
 
         case RXD_OPAQUE_RING_JUMBO:
@@ -3500,7 +3500,7 @@ static void tg3_free_rings(struct tg3 *tp)
                         continue;
                 pci_unmap_single(tp->pdev,
                                  pci_unmap_addr(rxp, mapping),
-                                 RX_PKT_BUF_SZ - tp->rx_offset,
+                                 tp->rx_pkt_buf_sz - tp->rx_offset,
                                  PCI_DMA_FROMDEVICE);
                 dev_kfree_skb_any(rxp->skb);
                 rxp->skb = NULL;
@@ -3573,6 +3573,11 @@ static void tg3_init_rings(struct tg3 *tp)
         memset(tp->rx_rcb, 0, TG3_RX_RCB_RING_BYTES(tp));
         memset(tp->tx_ring, 0, TG3_TX_RING_BYTES);
 
+        tp->rx_pkt_buf_sz = RX_PKT_BUF_SZ;
+        if ((GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5780) &&
+            (tp->dev->mtu > ETH_DATA_LEN))
+                tp->rx_pkt_buf_sz = RX_JUMBO_PKT_BUF_SZ;
+
         /* Initialize invariants of the rings, we only set this
          * stuff once.  This works because the card does not
          * write into the rx buffer posting rings.
@@ -3581,7 +3586,7 @@ static void tg3_init_rings(struct tg3 *tp)
                 struct tg3_rx_buffer_desc *rxd;
 
                 rxd = &tp->rx_std[i];
-                rxd->idx_len = (RX_PKT_BUF_SZ - tp->rx_offset - 64)
+                rxd->idx_len = (tp->rx_pkt_buf_sz - tp->rx_offset - 64)
                         << RXD_LEN_SHIFT;
                 rxd->type_flags = (RXD_FLAG_END << RXD_FLAGS_SHIFT);
                 rxd->opaque = (RXD_OPAQUE_RING_STD |
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 7cb2eefa7aad..15eb2bdb2de1 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2088,6 +2088,8 @@ struct tg3 {
         struct tg3_rx_buffer_desc       *rx_rcb;
         dma_addr_t                      rx_rcb_mapping;
 
+        u32                             rx_pkt_buf_sz;
+
         /* begin "everything else" cacheline(s) section */
         struct net_device_stats         net_stats;
         struct net_device_stats         net_stats_prev;