[BNX2]: Enable S/G for jumbo RX.

If the MTU requires more than 1 page for the SKB, enable the page ring
and calculate the size of the page ring.  This will guarantee order-0
allocation regardless of the MTU size.

Fixup loopback test packet size so that we don't deal with the pages
during loopback test.

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

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 6c0fc8a99c67..ae081c8dd45f 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -4493,15 +4493,32 @@ static u32 bnx2_find_max_ring(u32 ring_size, u32 max_size)
 static void
 bnx2_set_rx_ring_size(struct bnx2 *bp, u32 size)
 {
-        u32 rx_size;
+        u32 rx_size, rx_space, jumbo_size;
 
         /* 8 for CRC and VLAN */
         rx_size = bp->dev->mtu + ETH_HLEN + bp->rx_offset + 8;
 
+        rx_space = SKB_DATA_ALIGN(rx_size + BNX2_RX_ALIGN) + NET_SKB_PAD +
+                sizeof(struct skb_shared_info);
+
         bp->rx_copy_thresh = RX_COPY_THRESH;
         bp->rx_pg_ring_size = 0;
         bp->rx_max_pg_ring = 0;
         bp->rx_max_pg_ring_idx = 0;
+        if (rx_space > PAGE_SIZE) {
+                int pages = PAGE_ALIGN(bp->dev->mtu - 40) >> PAGE_SHIFT;
+
+                jumbo_size = size * pages;
+                if (jumbo_size > MAX_TOTAL_RX_PG_DESC_CNT)
+                        jumbo_size = MAX_TOTAL_RX_PG_DESC_CNT;
+
+                bp->rx_pg_ring_size = jumbo_size;
+                bp->rx_max_pg_ring = bnx2_find_max_ring(jumbo_size,
+                                                        MAX_RX_PG_RINGS);
+                bp->rx_max_pg_ring_idx = (bp->rx_max_pg_ring * RX_DESC_CNT) - 1;
+                rx_size = RX_COPY_THRESH + bp->rx_offset;
+                bp->rx_copy_thresh = 0;
+        }
 
         bp->rx_buf_use_size = rx_size;
         /* hw alignment */
@@ -4881,7 +4898,7 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
         else
                 return -EINVAL;
 
-        pkt_size = 1514;
+        pkt_size = min(bp->dev->mtu + ETH_HLEN, bp->rx_jumbo_thresh - 4);
         skb = netdev_alloc_skb(bp->dev, pkt_size);
         if (!skb)
                 return -ENOMEM;