ixgbe: xmit frame refactor

ixgbe_xmit_frame can be refactored to use fewer locals and better
utilize common kernel macros.

also fixed minor buglet with internal to driver vlan flag variable being
passed incorrectly.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index a215350..41aede5 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -3213,8 +3213,8 @@ static int ixgbe_tso(struct ixgbe_adapter *adapter,
        unsigned int i;
        int err;
        struct ixgbe_tx_buffer *tx_buffer_info;
-       u32 vlan_macip_lens = 0, type_tucmd_mlhl = 0;
-       u32 mss_l4len_idx = 0, l4len;
+       u32 vlan_macip_lens = 0, type_tucmd_mlhl;
+       u32 mss_l4len_idx, l4len;
 
        if (skb_is_gso(skb)) {
                if (skb_header_cloned(skb)) {
@@ -3263,7 +3263,7 @@ static int ixgbe_tso(struct ixgbe_adapter *adapter,
                context_desc->seqnum_seed = 0;
 
                /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
-               type_tucmd_mlhl |= (IXGBE_TXD_CMD_DEXT |
+               type_tucmd_mlhl = (IXGBE_TXD_CMD_DEXT |
                                    IXGBE_ADVTXD_DTYP_CTXT);
 
                if (skb->protocol == htons(ETH_P_IP))
@@ -3272,7 +3272,7 @@ static int ixgbe_tso(struct ixgbe_adapter *adapter,
                context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd_mlhl);
 
                /* MSS L4LEN IDX */
-               mss_l4len_idx |=
+               mss_l4len_idx =
                    (skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT);
                mss_l4len_idx |= (l4len << IXGBE_ADVTXD_L4LEN_SHIFT);
                /* use index 1 for TSO */
@@ -3330,14 +3330,12 @@ static bool ixgbe_tx_csum(struct ixgbe_adapter *adapter,
                                        type_tucmd_mlhl |=
                                                IXGBE_ADVTXD_TUCMD_L4T_TCP;
                                break;
-
                        case __constant_htons(ETH_P_IPV6):
                                /* XXX what about other V6 headers?? */
                                if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
                                        type_tucmd_mlhl |=
                                                IXGBE_ADVTXD_TUCMD_L4T_TCP;
                                break;
-
                        default:
                                if (unlikely(net_ratelimit())) {
                                        DPRINTK(PROBE, WARNING,
@@ -3354,6 +3352,7 @@ static bool ixgbe_tx_csum(struct ixgbe_adapter *adapter,
 
                tx_buffer_info->time_stamp = jiffies;
                tx_buffer_info->next_to_watch = i;
+
                adapter->hw_csum_tx_good++;
                i++;
                if (i == tx_ring->count)
@@ -3362,6 +3361,7 @@ static bool ixgbe_tx_csum(struct ixgbe_adapter *adapter,
 
                return true;
        }
+
        return false;
 }
 
@@ -3533,43 +3533,35 @@ static int ixgbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 {
        struct ixgbe_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_ring *tx_ring;
-       unsigned int len = skb->len;
        unsigned int first;
        unsigned int tx_flags = 0;
        u8 hdr_len = 0;
        int r_idx = 0, tso;
-       unsigned int mss = 0;
        int count = 0;
        unsigned int f;
-       unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
-       len -= skb->data_len;
+
        r_idx = (adapter->num_tx_queues - 1) & skb->queue_mapping;
        tx_ring = &adapter->tx_ring[r_idx];
 
-
-       if (skb->len <= 0) {
-               dev_kfree_skb(skb);
-               return NETDEV_TX_OK;
+       if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
+               tx_flags |= vlan_tx_tag_get(skb);
+               tx_flags <<= IXGBE_TX_FLAGS_VLAN_SHIFT;
+               tx_flags |= IXGBE_TX_FLAGS_VLAN;
        }
-       mss = skb_shinfo(skb)->gso_size;
-
-       if (mss)
-               count++;
-       else if (skb->ip_summed == CHECKSUM_PARTIAL)
+       /* three things can cause us to need a context descriptor */
+       if (skb_is_gso(skb) ||
+           (skb->ip_summed == CHECKSUM_PARTIAL) ||
+           (tx_flags & IXGBE_TX_FLAGS_VLAN))
                count++;
 
-       count += TXD_USE_COUNT(len);
-       for (f = 0; f < nr_frags; f++)
+       count += TXD_USE_COUNT(skb_headlen(skb));
+       for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
                count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
 
        if (ixgbe_maybe_stop_tx(netdev, tx_ring, count)) {
                adapter->tx_busy++;
                return NETDEV_TX_BUSY;
        }
-       if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
-               tx_flags |= IXGBE_TX_FLAGS_VLAN;
-               tx_flags |= (vlan_tx_tag_get(skb) << IXGBE_TX_FLAGS_VLAN_SHIFT);
-       }
 
        if (skb->protocol == htons(ETH_P_IP))
                tx_flags |= IXGBE_TX_FLAGS_IPV4;