[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>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 9188a9b3ba2ec18fa4df86a92c3ae973c094838e..eca4b91454c0af42eebf4456d79e2ef64c00455f 100644 (file)
--- 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 7cb2eefa7aad00095ab7f1ecc0614c0b8adf7454..15eb2bdb2de16c0cec6206fa7f822ede8d7bf56a 100644 (file)
--- 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;