[PATCH] e100: Performance optimizations to e100 Tx Path
Performance optimizations to e100 Tx Path
Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
diff --git a/drivers/net/e100.c b/drivers/net/e100.c
index a43b825..fc2a401 100644
--- a/drivers/net/e100.c
+++ b/drivers/net/e100.c
@@ -777,7 +777,7 @@
return 0;
}
-#define E100_WAIT_SCB_TIMEOUT 40
+#define E100_WAIT_SCB_TIMEOUT 20000 /* we might have to wait 100ms!!! */
static inline int e100_exec_cmd(struct nic *nic, u8 cmd, dma_addr_t dma_addr)
{
unsigned long flags;
@@ -847,6 +847,10 @@
* because the controller is too busy, so
* let's just queue the command and try again
* when another command is scheduled. */
+ if(err == -ENOSPC) {
+ //request a reset
+ schedule_work(&nic->tx_timeout_task);
+ }
break;
} else {
nic->cuc_cmd = cuc_resume;
@@ -891,7 +895,7 @@
static void e100_get_defaults(struct nic *nic)
{
- struct param_range rfds = { .min = 64, .max = 256, .count = 64 };
+ struct param_range rfds = { .min = 16, .max = 256, .count = 64 };
struct param_range cbs = { .min = 64, .max = 256, .count = 64 };
pci_read_config_byte(nic->pdev, PCI_REVISION_ID, &nic->rev_id);
@@ -906,8 +910,9 @@
/* Quadwords to DMA into FIFO before starting frame transmit */
nic->tx_threshold = 0xE0;
- nic->tx_command = cpu_to_le16(cb_tx | cb_i | cb_tx_sf |
- ((nic->mac >= mac_82558_D101_A4) ? cb_cid : 0));
+ /* no interrupt for every tx completion, delay = 256us if not 557*/
+ nic->tx_command = cpu_to_le16(cb_tx | cb_tx_sf |
+ ((nic->mac >= mac_82558_D101_A4) ? cb_cid : cb_i));
/* Template for a freshly allocated RFD */
nic->blank_rfd.command = cpu_to_le16(cb_el);
@@ -1289,12 +1294,15 @@
struct sk_buff *skb)
{
cb->command = nic->tx_command;
+ /* interrupt every 16 packets regardless of delay */
+ if((nic->cbs_avail & ~15) == nic->cbs_avail) cb->command |= cb_i;
cb->u.tcb.tbd_array = cb->dma_addr + offsetof(struct cb, u.tcb.tbd);
cb->u.tcb.tcb_byte_count = 0;
cb->u.tcb.threshold = nic->tx_threshold;
cb->u.tcb.tbd_count = 1;
cb->u.tcb.tbd.buf_addr = cpu_to_le32(pci_map_single(nic->pdev,
skb->data, skb->len, PCI_DMA_TODEVICE));
+ // check for mapping failure?
cb->u.tcb.tbd.size = cpu_to_le16(skb->len);
}