dde_ipxe: increase RXD and TXD for Intel NICs

The default iPXE settings of 8 (RXD) and 16 (TXD) lead to issues when
AMT is enabled. In most other OS drivers those descriptors are set
to 256, let us do the same. This should fix all observed issues wrt.
AMT.

Fixes #2108.

repos/dde_ipxe/patches/intel.patch

@@ -18,6 +18,30 @@
 +	PCI_ROM ( 0x8086, 0x155a, "i218lm", "I218LM", 0 ),
 +	PCI_ROM ( 0x8086, 0x15a2, "i218lm-3", "I218-LM", 0 ),
 +	PCI_ROM ( 0x8086, 0x156f, "i219lm", "I219-LM", 0 ),
- 	PCI_ROM ( 0x8086, 0x294c, "82566dc-2", "82566DC-2", 0 ),
+	PCI_ROM ( 0x8086, 0x294c, "82566dc-2", "82566DC-2", 0 ),
  	PCI_ROM ( 0x8086, 0x2e6e, "cemedia", "CE Media Processor", 0 ),
  };
+--- a/src/drivers/net/intel.h
++++ b/src/drivers/net/intel.h
+@@ -138,10 +138,10 @@ enum intel_descriptor_status {
+  * Minimum value is 8, since the descriptor ring length must be a
+  * multiple of 128.
+  */
+-#define INTEL_NUM_RX_DESC 8
++#define INTEL_NUM_RX_DESC 256
+ 
+ /** Receive descriptor ring fill level */
+-#define INTEL_RX_FILL 4
++#define INTEL_RX_FILL (INTEL_NUM_RX_DESC / 2)
+ 
+ /** Receive buffer length */
+ #define INTEL_RX_MAX_LEN 2048
+@@ -154,7 +154,7 @@ enum intel_descriptor_status {
+  * Descriptor ring length must be a multiple of 16.  ICH8/9/10
+  * requires a minimum of 16 TX descriptors.
+  */
+-#define INTEL_NUM_TX_DESC 16
++#define INTEL_NUM_TX_DESC 256
+ 
+ /** Receive/Transmit Descriptor Base Address Low (offset) */
+ #define INTEL_xDBAL 0x00

repos/dde_ipxe/ports/dde_ipxe.hash

@@ -1 +1 @@
-07dd65ccba7d9b1f98579fcf0d0755dc8a53e1a4
+3bdff36769bbe70cc2d711b3ca4e00536a0e51da