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authorDavid Woodhouse <David.Woodhouse@intel.com>2015-09-23 11:44:57 +0300
committerDavid S. Miller <davem@davemloft.net>2015-09-24 00:47:12 +0300
commit0a5aeee0b79fa99d8e04c98dd4e87d4f52aa497b (patch)
treed21cdf659bb7a929d5548e495316f1a514354c29 /drivers/net/ethernet/realtek
parenta3b804043f490aeec57d8ca5baccdd35e6250857 (diff)
downloadlinux-0a5aeee0b79fa99d8e04c98dd4e87d4f52aa497b.tar.xz
8139cp: Reduce duplicate csum/tso code in cp_start_xmit()
We calculate the value of the opts1 descriptor field in three different places. With two different behaviours when given an invalid packet to be checksummed — none of them correct. Sort that out. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/realtek')
-rw-r--r--drivers/net/ethernet/realtek/8139cp.c61
1 files changed, 20 insertions, 41 deletions
diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index 75a8cee6b1d6..b3bd8b103593 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -733,7 +733,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
{
struct cp_private *cp = netdev_priv(dev);
unsigned entry;
- u32 eor, flags;
+ u32 eor, opts1;
unsigned long intr_flags;
__le32 opts2;
int mss = 0;
@@ -753,6 +753,21 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
mss = skb_shinfo(skb)->gso_size;
opts2 = cpu_to_le32(cp_tx_vlan_tag(skb));
+ opts1 = DescOwn;
+ if (mss)
+ opts1 |= LargeSend | ((mss & MSSMask) << MSSShift);
+ else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ const struct iphdr *ip = ip_hdr(skb);
+ if (ip->protocol == IPPROTO_TCP)
+ opts1 |= IPCS | TCPCS;
+ else if (ip->protocol == IPPROTO_UDP)
+ opts1 |= IPCS | UDPCS;
+ else {
+ WARN_ONCE(1,
+ "Net bug: asked to checksum invalid Legacy IP packet\n");
+ goto out_dma_error;
+ }
+ }
if (skb_shinfo(skb)->nr_frags == 0) {
struct cp_desc *txd = &cp->tx_ring[entry];
@@ -768,21 +783,9 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
txd->addr = cpu_to_le64(mapping);
wmb();
- flags = eor | len | DescOwn | FirstFrag | LastFrag;
-
- if (mss)
- flags |= LargeSend | ((mss & MSSMask) << MSSShift);
- else if (skb->ip_summed == CHECKSUM_PARTIAL) {
- const struct iphdr *ip = ip_hdr(skb);
- if (ip->protocol == IPPROTO_TCP)
- flags |= IPCS | TCPCS;
- else if (ip->protocol == IPPROTO_UDP)
- flags |= IPCS | UDPCS;
- else
- WARN_ON(1); /* we need a WARN() */
- }
+ opts1 |= eor | len | FirstFrag | LastFrag;
- txd->opts1 = cpu_to_le32(flags);
+ txd->opts1 = cpu_to_le32(opts1);
wmb();
cp->tx_skb[entry] = skb;
@@ -793,7 +796,6 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
u32 first_len, first_eor, ctrl;
dma_addr_t first_mapping;
int frag, first_entry = entry;
- const struct iphdr *ip = ip_hdr(skb);
/* We must give this initial chunk to the device last.
* Otherwise we could race with the device.
@@ -825,19 +827,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
eor = (entry == (CP_TX_RING_SIZE - 1)) ? RingEnd : 0;
- ctrl = eor | len | DescOwn;
-
- if (mss)
- ctrl |= LargeSend |
- ((mss & MSSMask) << MSSShift);
- else if (skb->ip_summed == CHECKSUM_PARTIAL) {
- if (ip->protocol == IPPROTO_TCP)
- ctrl |= IPCS | TCPCS;
- else if (ip->protocol == IPPROTO_UDP)
- ctrl |= IPCS | UDPCS;
- else
- BUG();
- }
+ ctrl = opts1 | eor | len;
if (frag == skb_shinfo(skb)->nr_frags - 1)
ctrl |= LastFrag;
@@ -857,18 +847,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
txd->addr = cpu_to_le64(first_mapping);
wmb();
- ctrl = first_eor | first_len | FirstFrag | DescOwn;
- if (mss)
- ctrl |= LargeSend | ((mss & MSSMask) << MSSShift);
- else if (skb->ip_summed == CHECKSUM_PARTIAL) {
- if (ip->protocol == IPPROTO_TCP)
- ctrl |= IPCS | TCPCS;
- else if (ip->protocol == IPPROTO_UDP)
- ctrl |= IPCS | UDPCS;
- else
- BUG();
- }
-
+ ctrl = opts1 | first_eor | first_len | FirstFrag;
txd->opts1 = cpu_to_le32(ctrl);
wmb();