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>
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@ -733,7 +733,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
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{
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struct cp_private *cp = netdev_priv(dev);
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unsigned entry;
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u32 eor, flags;
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u32 eor, opts1;
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unsigned long intr_flags;
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__le32 opts2;
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int mss = 0;
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@ -753,6 +753,21 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
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mss = skb_shinfo(skb)->gso_size;
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opts2 = cpu_to_le32(cp_tx_vlan_tag(skb));
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opts1 = DescOwn;
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if (mss)
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opts1 |= LargeSend | ((mss & MSSMask) << MSSShift);
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else if (skb->ip_summed == CHECKSUM_PARTIAL) {
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const struct iphdr *ip = ip_hdr(skb);
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if (ip->protocol == IPPROTO_TCP)
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opts1 |= IPCS | TCPCS;
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else if (ip->protocol == IPPROTO_UDP)
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opts1 |= IPCS | UDPCS;
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else {
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WARN_ONCE(1,
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"Net bug: asked to checksum invalid Legacy IP packet\n");
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goto out_dma_error;
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}
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}
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if (skb_shinfo(skb)->nr_frags == 0) {
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struct cp_desc *txd = &cp->tx_ring[entry];
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@ -768,21 +783,9 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
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txd->addr = cpu_to_le64(mapping);
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wmb();
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flags = eor | len | DescOwn | FirstFrag | LastFrag;
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opts1 |= eor | len | FirstFrag | LastFrag;
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if (mss)
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flags |= LargeSend | ((mss & MSSMask) << MSSShift);
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else if (skb->ip_summed == CHECKSUM_PARTIAL) {
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const struct iphdr *ip = ip_hdr(skb);
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if (ip->protocol == IPPROTO_TCP)
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flags |= IPCS | TCPCS;
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else if (ip->protocol == IPPROTO_UDP)
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flags |= IPCS | UDPCS;
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else
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WARN_ON(1); /* we need a WARN() */
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}
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txd->opts1 = cpu_to_le32(flags);
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txd->opts1 = cpu_to_le32(opts1);
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wmb();
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cp->tx_skb[entry] = skb;
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@ -793,7 +796,6 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
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u32 first_len, first_eor, ctrl;
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dma_addr_t first_mapping;
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int frag, first_entry = entry;
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const struct iphdr *ip = ip_hdr(skb);
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/* We must give this initial chunk to the device last.
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* Otherwise we could race with the device.
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@ -825,19 +827,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
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eor = (entry == (CP_TX_RING_SIZE - 1)) ? RingEnd : 0;
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ctrl = eor | len | DescOwn;
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if (mss)
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ctrl |= LargeSend |
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((mss & MSSMask) << MSSShift);
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else if (skb->ip_summed == CHECKSUM_PARTIAL) {
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if (ip->protocol == IPPROTO_TCP)
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ctrl |= IPCS | TCPCS;
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else if (ip->protocol == IPPROTO_UDP)
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ctrl |= IPCS | UDPCS;
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else
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BUG();
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}
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ctrl = opts1 | eor | len;
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if (frag == skb_shinfo(skb)->nr_frags - 1)
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ctrl |= LastFrag;
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@ -857,18 +847,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
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txd->addr = cpu_to_le64(first_mapping);
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wmb();
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ctrl = first_eor | first_len | FirstFrag | DescOwn;
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if (mss)
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ctrl |= LargeSend | ((mss & MSSMask) << MSSShift);
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else if (skb->ip_summed == CHECKSUM_PARTIAL) {
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if (ip->protocol == IPPROTO_TCP)
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ctrl |= IPCS | TCPCS;
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else if (ip->protocol == IPPROTO_UDP)
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ctrl |= IPCS | UDPCS;
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else
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BUG();
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}
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ctrl = opts1 | first_eor | first_len | FirstFrag;
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txd->opts1 = cpu_to_le32(ctrl);
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wmb();
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