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authorMike McCormack <mikem@ring3k.org>2010-02-12 06:58:02 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-12 16:21:02 -0800
commit39ef110ba859f44efeb9a88d0e85316cd1bbecda (patch)
treef22facb05f5071c9b6611081e04f181a42ab8264 /drivers/net/sky2.c
parent44dde56d37787cbad2e867a41fe87d6b0aa37fc8 (diff)
downloadlinux-39ef110ba859f44efeb9a88d0e85316cd1bbecda.tar.bz2
sky2: Factor out code to calculate packet sizes
Move code to calculate receive threshold and packet size out of sky2_rx_start() so that is can be called from elsewhere easily. Signed-off-by: Mike McCormack <mikem@ring3k.org> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sky2.c')
-rw-r--r--drivers/net/sky2.c57
1 files changed, 37 insertions, 20 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 8a87e16e732f..c5de65c6f6e1 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1049,6 +1049,40 @@ static inline struct sky2_rx_le *sky2_next_rx(struct sky2_port *sky2)
return le;
}
+static unsigned sky2_get_rx_threshold(struct sky2_port* sky2)
+{
+ unsigned size;
+
+ /* Space needed for frame data + headers rounded up */
+ size = roundup(sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN, 8);
+
+ /* Stopping point for hardware truncation */
+ return (size - 8) / sizeof(u32);
+}
+
+static unsigned sky2_get_rx_data_size(struct sky2_port* sky2)
+{
+ struct rx_ring_info *re;
+ unsigned size;
+
+ /* Space needed for frame data + headers rounded up */
+ size = roundup(sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN, 8);
+
+ sky2->rx_nfrags = size >> PAGE_SHIFT;
+ BUG_ON(sky2->rx_nfrags > ARRAY_SIZE(re->frag_addr));
+
+ /* Compute residue after pages */
+ size -= sky2->rx_nfrags << PAGE_SHIFT;
+
+ /* Optimize to handle small packets and headers */
+ if (size < copybreak)
+ size = copybreak;
+ if (size < ETH_HLEN)
+ size = ETH_HLEN;
+
+ return size;
+}
+
/* Build description to hardware for one receive segment */
static void sky2_rx_add(struct sky2_port *sky2, u8 op,
dma_addr_t map, unsigned len)
@@ -1343,7 +1377,7 @@ static int sky2_rx_start(struct sky2_port *sky2)
struct sky2_hw *hw = sky2->hw;
struct rx_ring_info *re;
unsigned rxq = rxqaddr[sky2->port];
- unsigned i, size, thresh;
+ unsigned i, thresh;
sky2->rx_put = sky2->rx_next = 0;
sky2_qset(hw, rxq);
@@ -1364,25 +1398,7 @@ static int sky2_rx_start(struct sky2_port *sky2)
if (!(hw->flags & SKY2_HW_NEW_LE))
rx_set_checksum(sky2);
- /* Space needed for frame data + headers rounded up */
- size = roundup(sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN, 8);
-
- /* Stopping point for hardware truncation */
- thresh = (size - 8) / sizeof(u32);
-
- sky2->rx_nfrags = size >> PAGE_SHIFT;
- BUG_ON(sky2->rx_nfrags > ARRAY_SIZE(re->frag_addr));
-
- /* Compute residue after pages */
- size -= sky2->rx_nfrags << PAGE_SHIFT;
-
- /* Optimize to handle small packets and headers */
- if (size < copybreak)
- size = copybreak;
- if (size < ETH_HLEN)
- size = ETH_HLEN;
-
- sky2->rx_data_size = size;
+ sky2->rx_data_size = sky2_get_rx_data_size(sky2);
/* Fill Rx ring */
for (i = 0; i < sky2->rx_pending; i++) {
@@ -1407,6 +1423,7 @@ static int sky2_rx_start(struct sky2_port *sky2)
* the register is limited to 9 bits, so if you do frames > 2052
* you better get the MTU right!
*/
+ thresh = sky2_get_rx_threshold(sky2);
if (thresh > 0x1ff)
sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_OFF);
else {