e1000: Add copybreak when using packet split
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 431b03e..d641fbc 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3757,6 +3757,35 @@
/* Good Receive */
skb_put(skb, length);
+ {
+ /* this looks ugly, but it seems compiler issues make it
+ more efficient than reusing j */
+ int l1 = le16_to_cpu(rx_desc->wb.upper.length[0]);
+
+ /* page alloc/put takes too long and effects small packet
+ * throughput, so unsplit small packets and save the alloc/put*/
+ if (l1 && ((length + l1) < E1000_CB_LENGTH)) {
+ u8 *vaddr;
+ /* there is no documentation about how to call
+ * kmap_atomic, so we can't hold the mapping
+ * very long */
+ pci_dma_sync_single_for_cpu(pdev,
+ ps_page_dma->ps_page_dma[0],
+ PAGE_SIZE,
+ PCI_DMA_FROMDEVICE);
+ vaddr = kmap_atomic(ps_page->ps_page[0],
+ KM_SKB_DATA_SOFTIRQ);
+ memcpy(skb->tail, vaddr, l1);
+ kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ);
+ pci_dma_sync_single_for_device(pdev,
+ ps_page_dma->ps_page_dma[0],
+ PAGE_SIZE, PCI_DMA_FROMDEVICE);
+ skb_put(skb, l1);
+ length += l1;
+ goto copydone;
+ } /* if */
+ }
+
for (j = 0; j < adapter->rx_ps_pages; j++) {
if (!(length = le16_to_cpu(rx_desc->wb.upper.length[j])))
break;
@@ -3771,6 +3800,7 @@
skb->data_len += length;
}
+copydone:
e1000_rx_checksum(adapter, staterr,
rx_desc->wb.lower.hi_dword.csum_ip.csum, skb);
skb->protocol = eth_type_trans(skb, netdev);