Thread (15 messages) 15 messages, 2 authors, 2012-01-26

[net-next 07/12] e1000e: default IntMode based on kernel config & available hardware support

flat view
STALE5380d SUPERSEDED: 1 (0M)

From: Jeff Kirsher <hidden>
Date: 2012-01-26 07:22:01
Subsystem: intel ethernet drivers, networking drivers, the rest · Maintainers: Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds

Revision v1 of 166 in this series; 1 review trailer.

Revisions (166)
  1. v1
  2. v2 [diff vs current]
  3. v1
  4. v1
  5. v2 [diff vs current]
  6. v1
  7. v1
  8. v1
  9. v1
  10. v1
  11. v1
  12. v1
  13. v1
  14. v2 [diff vs current]
  15. v1
  16. v3 [diff vs current]
  17. v1
  18. v1
  19. v1
  20. v2 [diff vs current]
  21. v2 [diff vs current]
  22. v1
  23. v1
  24. v1
  25. v1
  26. v2 [diff vs current]
  27. v1
  28. v1 current
  29. v1
  30. v1
  31. v1
  32. v2 [diff vs current]
  33. v1
  34. v2 [diff vs current]
  35. v1
  36. v1
  37. v1
  38. v1
  39. v1
  40. v1
  41. v1
  42. v1
  43. v1
  44. v1
  45. v1
  46. v2 [diff vs current]
  47. v1
  48. v1
  49. v1
  50. v1
  51. v1
  52. v1
  53. v1
  54. v1
  55. v1
  56. v1
  57. v1
  58. v1
  59. v1
  60. v1
  61. v1
  62. v1
  63. v1
  64. v1
  65. v2 [diff vs current]
  66. v1
  67. v1
  68. v1
  69. v1
  70. v2 [diff vs current]
  71. v1
  72. v1
  73. v1
  74. v2 [diff vs current]
  75. v1
  76. v2 [diff vs current]
  77. v1
  78. v1
  79. v1
  80. v1
  81. v1
  82. v1
  83. v1
  84. v1
  85. v2 [diff vs current]
  86. v1
  87. v1
  88. v2 [diff vs current]
  89. v1
  90. v1
  91. v1
  92. v1
  93. v1
  94. v1
  95. v2 [diff vs current]
  96. v1
  97. v2 [diff vs current]
  98. v2 [diff vs current]
  99. v1
  100. v2 [diff vs current]
  101. v3 [diff vs current]
  102. v1
  103. v4 [diff vs current]
  104. v1
  105. v5 [diff vs current]
  106. v6 [diff vs current]
  107. v7 [diff vs current]
  108. v1
  109. v1
  110. v1
  111. v2 [diff vs current]
  112. v1
  113. v1
  114. v1
  115. v2 [diff vs current]
  116. v1
  117. v1
  118. v1
  119. v1
  120. v2 [diff vs current]
  121. v1
  122. v1
  123. v2 [diff vs current]
  124. v3 [diff vs current]
  125. v4 [diff vs current]
  126. v1
  127. v1
  128. v2 [diff vs current]
  129. v5 [diff vs current]
  130. v1
  131. v1
  132. v1
  133. v2 [diff vs current]
  134. v1
  135. v1
  136. v2 [diff vs current]
  137. v3 [diff vs current]
  138. v1
  139. v2 [diff vs current]
  140. v1
  141. v1
  142. v2 [diff vs current]
  143. v1
  144. v2 [diff vs current]
  145. v1
  146. v2 [diff vs current]
  147. v3 [diff vs current]
  148. v1
  149. v1
  150. v1
  151. v2 [diff vs current]
  152. v1
  153. v1
  154. v1
  155. v1
  156. v1
  157. v1
  158. v2 [diff vs current]
  159. v1
  160. v1
  161. v1
  162. v2 [diff vs current]
  163. v1
  164. v1
  165. v1
  166. v2 [diff vs current] 
From: Bruce Allan <redacted>

Based on a patch from Prabhakar Kushwaha [off-list ref], set
appropriate default interrupt mode dependent on whether CONFIG_PCI_MSI
is enabled in the kernel configuration and if the hardware supports
MSI-X.  Set the module parameter log message accordingly.

Signed-off-by: Bruce Allan <redacted>
Cc: Jin Qing <redacted>
Cc: Prabhakar Kushwaha <redacted>
Cc: Jin Qing <redacted>
Cc: Kumar Gala <redacted>
Tested-by: Aaron Brown <redacted>
Signed-off-by: Jeff Kirsher <redacted>
---
 drivers/net/ethernet/intel/e1000e/param.c |   48 ++++++++++++++++++++++++----
 1 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/param.c b/drivers/net/ethernet/intel/e1000e/param.c
index 20e93b0..40664f5 100644
--- a/drivers/net/ethernet/intel/e1000e/param.c
+++ b/drivers/net/ethernet/intel/e1000e/param.c
@@ -113,11 +113,20 @@ E1000_PARAM(InterruptThrottleRate, "Interrupt Throttling Rate");
 #define MAX_ITR 100000
 #define MIN_ITR 100
 
-/* IntMode (Interrupt Mode)
+/*
+ * IntMode (Interrupt Mode)
+ *
+ * Valid Range: varies depending on kernel configuration & hardware support
+ *
+ * legacy=0, MSI=1, MSI-X=2
  *
- * Valid Range: 0 - 2
+ * When MSI/MSI-X support is enabled in kernel-
+ *   Default Value: 2 (MSI-X) when supported by hardware, 1 (MSI) otherwise
+ * When MSI/MSI-X support is not enabled in kernel-
+ *   Default Value: 0 (legacy)
  *
- * Default Value: 2 (MSI-X)
+ * When a mode is specified that is not allowed/supported, it will be
+ * demoted to the most advanced interrupt mode available.
  */
 E1000_PARAM(IntMode, "Interrupt Mode");
 #define MAX_INTMODE	2
@@ -388,12 +397,33 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
 		static struct e1000_option opt = {
 			.type = range_option,
 			.name = "Interrupt Mode",
-			.err  = "defaulting to 2 (MSI-X)",
-			.def  = E1000E_INT_MODE_MSIX,
-			.arg  = { .r = { .min = MIN_INTMODE,
-					 .max = MAX_INTMODE } }
+#ifndef CONFIG_PCI_MSI
+			.err  = "defaulting to 0 (legacy)",
+			.def  = E1000E_INT_MODE_LEGACY,
+			.arg  = { .r = { .min = 0,
+					 .max = 0 } }
+#endif
 		};
 
+#ifdef CONFIG_PCI_MSI
+		if (adapter->flags & FLAG_HAS_MSIX) {
+			opt.err = kstrdup("defaulting to 2 (MSI-X)",
+					  GFP_KERNEL);
+			opt.def = E1000E_INT_MODE_MSIX;
+			opt.arg.r.max = E1000E_INT_MODE_MSIX;
+		} else {
+			opt.err = kstrdup("defaulting to 1 (MSI)", GFP_KERNEL);
+			opt.def = E1000E_INT_MODE_MSI;
+			opt.arg.r.max = E1000E_INT_MODE_MSI;
+		}
+
+		if (!opt.err) {
+			dev_err(&adapter->pdev->dev,
+				"Failed to allocate memory\n");
+			return;
+		}
+#endif
+
 		if (num_IntMode > bd) {
 			unsigned int int_mode = IntMode[bd];
 			e1000_validate_option(&int_mode, &opt, adapter);
@@ -401,6 +431,10 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter)
 		} else {
 			adapter->int_mode = opt.def;
 		}
+
+#ifdef CONFIG_PCI_MSI
+		kfree(opt.err);
+#endif
 	}
 	{ /* Smart Power Down */
 		static const struct e1000_option opt = {
-- 
1.7.7.6
Other recent patches touching these files
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help