diff options
| author | Mike McCormack <mikem@ring3k.org> | 2010-02-12 06:58:02 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-12 16:21:02 -0800 |
| commit | 39ef110ba859f44efeb9a88d0e85316cd1bbecda (patch) | |
| tree | f22facb05f5071c9b6611081e04f181a42ab8264 /drivers/net/sky2.c | |
| parent | 44dde56d37787cbad2e867a41fe87d6b0aa37fc8 (diff) | |
| download | blackbird-op-linux-39ef110ba859f44efeb9a88d0e85316cd1bbecda.tar.gz blackbird-op-linux-39ef110ba859f44efeb9a88d0e85316cd1bbecda.zip | |
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.c | 57 |
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 { |
