[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 9188a9b..eca4b91 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -2621,7 +2621,7 @@
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 @@
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 @@
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 @@
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 7cb2eef..15eb2bd 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2088,6 +2088,8 @@
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;