dde_ipxe: skip MAC/PHY reset on Intel NICs

Inspired by the mailing-list posting [1], this commit removes the
MAC/PHY reset for all Intel cards and effectively prevents the bandwidth
drop to 10 MBit/s (e.g., on i217lm). I understand it as preliminary fix
for practical reasons - a real fix would be to update the ipxe port and
monitor for more postings like the one mentioned.

[1] http://lists.ipxe.org/pipermail/ipxe-devel/2015-December/004511.html

repos/dde_ipxe/patches/intel.patch

@@ -1,8 +1,15 @@
-diff --git a/src/drivers/net/intel.c b/src/drivers/net/intel.c
-index c3a7d40..794edbb 100644
---- a/src/drivers/net/intel.c
 +++ b/src/drivers/net/intel.c
-@@ -953,6 +953,10 @@ static struct pci_device_id intel_nics[] = {
+@@ -305,6 +305,9 @@ static int intel_reset ( struct intel_nic *intel ) {
+ 		return 0;
+ 	}
+ 
++	/* XXX skip MAC/PHY reset */
++	return 0;
++
+ 	/* Reset PHY and MAC simultaneously */
+ 	writel ( ( ctrl | INTEL_CTRL_RST | INTEL_CTRL_PHY_RST ),
+ 		 intel->regs + INTEL_CTRL );
+@@ -953,6 +956,10 @@ static struct pci_device_id intel_nics[] = {
  	PCI_ROM ( 0x8086, 0x1526, "82576-5", "82576", 0 ),
  	PCI_ROM ( 0x8086, 0x1527, "82580-f2", "82580 Fiber", 0 ),
  	PCI_ROM ( 0x8086, 0x1533, "i210", "I210", 0 ),

repos/dde_ipxe/ports/dde_ipxe.hash

@@ -1 +1 @@
-5385d261f5973bda28547cd9a5037058b126e01c
+0e098bb1997a34688b68cec10f8173305aca9493

repos/dde_ipxe/ports/dde_ipxe.port

@@ -7,7 +7,7 @@ REV(ipxe) := c4bce43c3c4d3c5ebb2d926b58ad16dc9642c19d
 DIR(ipxe) := src/lib/dde_ipxe
 
 PATCHES   := patches/dde_ipxe.patch \
-             patches/add_devices.patch \
+             patches/intel.patch \
              patches/tg3.patch
 
 PATCH_OPT := -p1 -d ${DIR(ipxe)}