diff options
author | David Daney <ddaney@caviumnetworks.com> | 2010-01-07 11:05:05 -0800 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 12:53:08 +0100 |
commit | 924cc2680fbe181066ec138d369691d28d913ea2 (patch) | |
tree | 009d3b28ddf2ebc9466b882fd8170ea97e6d8a73 /drivers/staging/octeon | |
parent | 3368c784bcf77124aaf39372e627016c36bd4472 (diff) | |
download | kernel_samsung_espresso10-924cc2680fbe181066ec138d369691d28d913ea2.zip kernel_samsung_espresso10-924cc2680fbe181066ec138d369691d28d913ea2.tar.gz kernel_samsung_espresso10-924cc2680fbe181066ec138d369691d28d913ea2.tar.bz2 |
Staging: Octeon Ethernet: Enable scatter-gather.
Octeon ethernet hardware can handle NETIF_F_SG, so we enable it.
A gather list of up to six fragments will fit in the SKB's CB
structure, so no extra memory is required. If a SKB has more than six
fragments, we must linearize it.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
To: gregkh@suse.de
Patchwork: http://patchwork.linux-mips.org/patch/838/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/staging/octeon')
-rw-r--r-- | drivers/staging/octeon/ethernet-tx.c | 57 | ||||
-rw-r--r-- | drivers/staging/octeon/ethernet.c | 7 |
2 files changed, 55 insertions, 9 deletions
diff --git a/drivers/staging/octeon/ethernet-tx.c b/drivers/staging/octeon/ethernet-tx.c index 05b58f8..bc67e41 100644 --- a/drivers/staging/octeon/ethernet-tx.c +++ b/drivers/staging/octeon/ethernet-tx.c @@ -53,6 +53,8 @@ #include "cvmx-gmxx-defs.h" +#define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb)) + /* * You can define GET_SKBUFF_QOS() to override how the skbuff output * function determines which output queue is used. The default @@ -121,6 +123,7 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) uint64_t old_scratch; uint64_t old_scratch2; int qos; + int i; enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type; struct octeon_ethernet *priv = netdev_priv(dev); struct sk_buff *to_free_list; @@ -171,6 +174,28 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) } /* + * We have space for 6 segment pointers, If there will be more + * than that, we must linearize. + */ + if (unlikely(skb_shinfo(skb)->nr_frags > 5)) { + if (unlikely(__skb_linearize(skb))) { + queue_type = QUEUE_DROP; + if (USE_ASYNC_IOBDMA) { + /* Get the number of skbuffs in use by the hardware */ + CVMX_SYNCIOBDMA; + skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); + } else { + /* Get the number of skbuffs in use by the hardware */ + skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, + MAX_SKB_TO_FREE); + } + skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau + qos * 4); + spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); + goto skip_xmit; + } + } + + /* * The CN3XXX series of parts has an errata (GMX-401) which * causes the GMX block to hang if a collision occurs towards * the end of a <68 byte packet. As a workaround for this, we @@ -198,13 +223,6 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) } } - /* Build the PKO buffer pointer */ - hw_buffer.u64 = 0; - hw_buffer.s.addr = cvmx_ptr_to_phys(skb->data); - hw_buffer.s.pool = 0; - hw_buffer.s.size = - (unsigned long)skb_end_pointer(skb) - (unsigned long)skb->head; - /* Build the PKO command */ pko_command.u64 = 0; pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */ @@ -215,6 +233,31 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) pko_command.s.dontfree = 1; pko_command.s.reg0 = priv->fau + qos * 4; + + /* Build the PKO buffer pointer */ + hw_buffer.u64 = 0; + if (skb_shinfo(skb)->nr_frags == 0) { + hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); + hw_buffer.s.pool = 0; + hw_buffer.s.size = skb->len; + } else { + hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); + hw_buffer.s.pool = 0; + hw_buffer.s.size = skb_headlen(skb); + CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64; + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i; + hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)(page_address(fs->page) + fs->page_offset)); + hw_buffer.s.size = fs->size; + CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64; + } + hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb)); + hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1; + pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1; + pko_command.s.gather = 1; + goto dont_put_skbuff_in_hw; + } + /* * See if we can put this skb in the FPA pool. Any strange * behavior from the Linux networking stack will most likely diff --git a/drivers/staging/octeon/ethernet.c b/drivers/staging/octeon/ethernet.c index 9f5b741..9d63202 100644 --- a/drivers/staging/octeon/ethernet.c +++ b/drivers/staging/octeon/ethernet.c @@ -484,8 +484,11 @@ int cvm_oct_common_init(struct net_device *dev) && (always_use_pow || strstr(pow_send_list, dev->name))) priv->queue = -1; - if (priv->queue != -1 && USE_HW_TCPUDP_CHECKSUM) - dev->features |= NETIF_F_IP_CSUM; + if (priv->queue != -1) { + dev->features |= NETIF_F_SG; + if (USE_HW_TCPUDP_CHECKSUM) + dev->features |= NETIF_F_IP_CSUM; + } /* We do our own locking, Linux doesn't need to */ dev->features |= NETIF_F_LLTX; |