ibmveth: Remove dead frag processing code

Removes dead frag processing code from ibmveth. Since NETIF_F_SG was
not set, this code was never executed. Also, since the ibmveth
interface can only handle 6 fragments, core networking code would need
to be modified in order to efficiently enable this support.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 17 insertions, 88 deletions

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index 40cb00e37df..f6be7b29c84 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -28,7 +28,6 @@
 /**************************************************************************/
 /*
   TODO:
-  - remove frag processing code - no longer needed
   - add support for sysfs
   - possibly remove procfs support
 */
@@ -128,9 +127,6 @@ struct ibmveth_stat ibmveth_stats[] = {
         { "replenish_add_buff_success", IBMVETH_STAT_OFF(replenish_add_buff_success) },
         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
-        { "tx_multidesc_send", IBMVETH_STAT_OFF(tx_multidesc_send) },
-        { "tx_linearized", IBMVETH_STAT_OFF(tx_linearized) },
-        { "tx_linearize_failed", IBMVETH_STAT_OFF(tx_linearize_failed) },
         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 };
@@ -843,9 +839,8 @@ static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
         struct ibmveth_adapter *adapter = netdev->priv;
-        union ibmveth_buf_desc desc[IbmVethMaxSendFrags];
+        union ibmveth_buf_desc desc;
         unsigned long lpar_rc;
-        int nfrags = 0, curfrag;
         unsigned long correlator;
         unsigned long flags;
         unsigned int retry_count;
@@ -855,25 +850,11 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
         unsigned int tx_send_failed = 0;
         unsigned int tx_map_failed = 0;
 
-
-        if ((skb_shinfo(skb)->nr_frags + 1) > IbmVethMaxSendFrags) {
-                tx_dropped++;
-                goto out;
-        }
-
-        memset(&desc, 0, sizeof(desc));
-
-        /* nfrags = number of frags after the initial fragment */
-        nfrags = skb_shinfo(skb)->nr_frags;
-
-        if(nfrags)
-                adapter->tx_multidesc_send++;
-
-        /* map the initial fragment */
-        desc[0].fields.length  = nfrags ? skb->len - skb->data_len : skb->len;
-        desc[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
-                                        desc[0].fields.length, DMA_TO_DEVICE);
-        desc[0].fields.valid   = 1;
+        desc.desc = 0;
+        desc.fields.length  = skb->len;
+        desc.fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
+                                             desc.fields.length, DMA_TO_DEVICE);
+        desc.fields.valid   = 1;
 
         if (skb->ip_summed == CHECKSUM_PARTIAL &&
             ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
@@ -885,75 +866,34 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
         if (skb->ip_summed == CHECKSUM_PARTIAL) {
                 unsigned char *buf = skb_transport_header(skb) + skb->csum_offset;
 
-                desc[0].fields.no_csum = 1;
-                desc[0].fields.csum_good = 1;
+                desc.fields.no_csum = 1;
+                desc.fields.csum_good = 1;
 
                 /* Need to zero out the checksum */
                 buf[0] = 0;
                 buf[1] = 0;
         }
 
-        if(dma_mapping_error(desc[0].fields.address)) {
-                ibmveth_error_printk("tx: unable to map initial fragment\n");
+        if (dma_mapping_error(desc.fields.address)) {
+                ibmveth_error_printk("tx: unable to map xmit buffer\n");
                 tx_map_failed++;
                 tx_dropped++;
                 goto out;
         }
 
-        curfrag = nfrags;
-
-        /* map fragments past the initial portion if there are any */
-        while(curfrag--) {
-                skb_frag_t *frag = &skb_shinfo(skb)->frags[curfrag];
-                desc[curfrag+1].fields.address
-                        = dma_map_single(&adapter->vdev->dev,
-                                page_address(frag->page) + frag->page_offset,
-                                frag->size, DMA_TO_DEVICE);
-                desc[curfrag+1].fields.length = frag->size;
-                desc[curfrag+1].fields.valid  = 1;
-                if (skb->ip_summed == CHECKSUM_PARTIAL) {
-                        desc[curfrag+1].fields.no_csum = 1;
-                        desc[curfrag+1].fields.csum_good = 1;
-                }
-
-                if(dma_mapping_error(desc[curfrag+1].fields.address)) {
-                        ibmveth_error_printk("tx: unable to map fragment %d\n", curfrag);
-                        tx_map_failed++;
-                        tx_dropped++;
-                        /* Free all the mappings we just created */
-                        while(curfrag < nfrags) {
-                                dma_unmap_single(&adapter->vdev->dev,
-                                                 desc[curfrag+1].fields.address,
-                                                 desc[curfrag+1].fields.length,
-                                                 DMA_TO_DEVICE);
-                                curfrag++;
-                        }
-                        goto out;
-                }
-        }
-
         /* send the frame. Arbitrarily set retrycount to 1024 */
         correlator = 0;
         retry_count = 1024;
         do {
                 lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
-                                             desc[0].desc,
-                                             desc[1].desc,
-                                             desc[2].desc,
-                                             desc[3].desc,
-                                             desc[4].desc,
-                                             desc[5].desc,
-                                             correlator,
-                                             &correlator);
+                                             desc.desc, 0, 0, 0, 0, 0,
+                                             correlator, &correlator);
         } while ((lpar_rc == H_BUSY) && (retry_count--));
 
         if(lpar_rc != H_SUCCESS && lpar_rc != H_DROPPED) {
-                int i;
                 ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
-                for(i = 0; i < 6; i++) {
-                        ibmveth_error_printk("tx: desc[%i] valid=%d, len=%d, address=0x%d\n", i,
-                                             desc[i].fields.valid, desc[i].fields.length, desc[i].fields.address);
-                }
+                ibmveth_error_printk("tx: valid=%d, len=%d, address=0x%08x\n",
+                                     desc.fields.valid, desc.fields.length, desc.fields.address);
                 tx_send_failed++;
                 tx_dropped++;
         } else {
@@ -962,11 +902,8 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
                 netdev->trans_start = jiffies;
         }
 
-        do {
-                dma_unmap_single(&adapter->vdev->dev,
-                                desc[nfrags].fields.address,
-                                desc[nfrags].fields.length, DMA_TO_DEVICE);
-        } while(--nfrags >= 0);
+        dma_unmap_single(&adapter->vdev->dev, desc.fields.address,
+                         desc.fields.length, DMA_TO_DEVICE);
 
 out:    spin_lock_irqsave(&adapter->stats_lock, flags);
         adapter->stats.tx_dropped += tx_dropped;
@@ -1366,10 +1303,7 @@ static int ibmveth_seq_show(struct seq_file *seq, void *v)
                    firmware_mac[3], firmware_mac[4], firmware_mac[5]);
 
         seq_printf(seq, "\nAdapter Statistics:\n");
-        seq_printf(seq, "  TX:  skbuffs linearized:          %ld\n", adapter->tx_linearized);
-        seq_printf(seq, "       multi-descriptor sends:      %ld\n", adapter->tx_multidesc_send);
-        seq_printf(seq, "       skb_linearize failures:      %ld\n", adapter->tx_linearize_failed);
-        seq_printf(seq, "       vio_map_single failres:      %ld\n", adapter->tx_map_failed);
+        seq_printf(seq, "  TX:  vio_map_single failres:      %ld\n", adapter->tx_map_failed);
         seq_printf(seq, "       send failures:               %ld\n", adapter->tx_send_failed);
         seq_printf(seq, "  RX:  replenish task cycles:       %ld\n", adapter->replenish_task_cycles);
         seq_printf(seq, "       alloc_skb_failures:          %ld\n", adapter->replenish_no_mem);
diff --git a/drivers/net/ibmveth.h b/drivers/net/ibmveth.h
index 43b068d9a55..30f9fc67b0c 100644
--- a/drivers/net/ibmveth.h
+++ b/drivers/net/ibmveth.h
@@ -25,8 +25,6 @@
 #ifndef _IBMVETH_H
 #define _IBMVETH_H
 
-#define IbmVethMaxSendFrags 6
-
 /* constants for H_MULTICAST_CTRL */
 #define IbmVethMcastReceptionModifyBit     0x80000UL
 #define IbmVethMcastReceptionEnableBit     0x20000UL
@@ -147,9 +145,6 @@ struct ibmveth_adapter {
     u64 replenish_add_buff_success;
     u64 rx_invalid_buffer;
     u64 rx_no_buffer;
-    u64 tx_multidesc_send;
-    u64 tx_linearized;
-    u64 tx_linearize_failed;
     u64 tx_map_failed;
     u64 tx_send_failed;
     spinlock_t stats_lock;