[PATCH 5/6] ibmveth: Remove dead frag processing code
Brian King
brking at linux.vnet.ibm.com
Tue Aug 7 05:42:41 EST 2007
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 at linux.vnet.ibm.com>
---
linux-2.6-bjking1/drivers/net/ibmveth.c | 100 +++++---------------------------
linux-2.6-bjking1/drivers/net/ibmveth.h | 5 -
2 files changed, 17 insertions(+), 88 deletions(-)
diff -puN drivers/net/ibmveth.c~ibmveth_remove_frag drivers/net/ibmveth.c
--- linux-2.6/drivers/net/ibmveth.c~ibmveth_remove_frag 2007-08-06 14:11:08.000000000 -0500
+++ linux-2.6-bjking1/drivers/net/ibmveth.c 2007-08-06 14:11:39.000000000 -0500
@@ -28,7 +28,6 @@
/**************************************************************************/
/*
TODO:
- - remove frag processing code - no longer needed
- add support for sysfs
- possibly remove procfs support
*/
@@ -127,9 +126,6 @@ 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) }
};
@@ -825,9 +821,8 @@ static int ibmveth_ioctl(struct net_devi
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;
@@ -837,25 +832,11 @@ static int ibmveth_start_xmit(struct sk_
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)) {
@@ -867,75 +848,34 @@ static int ibmveth_start_xmit(struct sk_
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 {
@@ -944,11 +884,8 @@ static int ibmveth_start_xmit(struct sk_
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;
@@ -1360,10 +1297,7 @@ static int ibmveth_seq_show(struct seq_f
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 -puN drivers/net/ibmveth.h~ibmveth_remove_frag drivers/net/ibmveth.h
--- linux-2.6/drivers/net/ibmveth.h~ibmveth_remove_frag 2007-08-06 14:11:08.000000000 -0500
+++ linux-2.6-bjking1/drivers/net/ibmveth.h 2007-08-06 14:11:39.000000000 -0500
@@ -25,8 +25,6 @@
#ifndef _IBMVETH_H
#define _IBMVETH_H
-#define IbmVethMaxSendFrags 6
-
/* constants for H_MULTICAST_CTRL */
#define IbmVethMcastReceptionModifyBit 0x80000UL
#define IbmVethMcastReceptionEnableBit 0x20000UL
@@ -146,9 +144,6 @@ 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;
_
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