[PATCH] e1000: Make the copybreak value a module parameter

Allow the user to vary the size that copybreak works. Currently cb is enabled
for packets < 256 bytes, but various tests indicate that this should be
configurable for specific use cases. In addition, this parameter allows us
to force never/always during testing to get full and predictable coverage of
both code paths.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 6c3618d55d15..3f40a902de64 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -213,6 +213,12 @@ static void e1000_netpoll (struct net_device *netdev);
 
 extern void e1000_check_options(struct e1000_adapter *adapter);
 
+#define COPYBREAK_DEFAULT 256
+static unsigned int copybreak __read_mostly = COPYBREAK_DEFAULT;
+module_param(copybreak, uint, 0644);
+MODULE_PARM_DESC(copybreak,
+        "Maximum size of packet that is copied to a new buffer on receive");
+
 static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
                      pci_channel_state_t state);
 static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev);
@@ -264,7 +270,13 @@ e1000_init_module(void)
         printk(KERN_INFO "%s\n", e1000_copyright);
 
         ret = pci_register_driver(&e1000_driver);
-
+        if (copybreak != COPYBREAK_DEFAULT) {
+                if (copybreak == 0)
+                        printk(KERN_INFO "e1000: copybreak disabled\n");
+                else
+                        printk(KERN_INFO "e1000: copybreak enabled for "
+                               "packets <= %u bytes\n", copybreak);
+        }
         return ret;
 }
 
@@ -4235,8 +4247,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
                 /* code added for copybreak, this should improve
                  * performance for small packets with large amounts
                  * of reassembly being done in the stack */
-#define E1000_CB_LENGTH 256
-                if (length < E1000_CB_LENGTH) {
+                if (length < copybreak) {
                         struct sk_buff *new_skb =
                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
                         if (new_skb) {
@@ -4394,7 +4405,7 @@ e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
 
                 /* page alloc/put takes too long and effects small packet
                  * throughput, so unsplit small packets and save the alloc/put*/
-                if (l1 && ((length + l1) <= adapter->rx_ps_bsize0)) {
+                if (l1 && (l1 <= copybreak) && ((length + l1) <= adapter->rx_ps_bsize0)) {
                         u8 *vaddr;
                         /* there is no documentation about how to call
                          * kmap_atomic, so we can't hold the mapping