Add a different #define for the maximum number of transmit and

recieve descriptors for the igb(4) class of devices.  This will
allow a better definition for maximum going forward.  Some igb(4)
devices support more than the default 4K.

Reported by:	Jason (j@nitrology.com)
Sponsored by:	Limelight Networks

2 files changed, 8 insertions, 6 deletions

diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c
index ed6da9d9517b..e86095decfd6 100644
--- a/sys/dev/e1000/if_em.c
+++ b/sys/dev/e1000/if_em.c
@@ -515,8 +515,8 @@ static struct if_shared_ctx igb_sctx_init = {
 
 	.isc_nrxd_min = {EM_MIN_RXD},
 	.isc_ntxd_min = {EM_MIN_TXD},
-	.isc_nrxd_max = {EM_MAX_RXD},
-	.isc_ntxd_max = {EM_MAX_TXD},
+	.isc_nrxd_max = {IGB_MAX_RXD},
+	.isc_ntxd_max = {IGB_MAX_TXD},
 	.isc_nrxd_default = {EM_DEFAULT_RXD},
 	.isc_ntxd_default = {EM_DEFAULT_TXD},
 };
diff --git a/sys/dev/e1000/if_em.h b/sys/dev/e1000/if_em.h
index f3ba10439e23..6e19449ac8b4 100644
--- a/sys/dev/e1000/if_em.h
+++ b/sys/dev/e1000/if_em.h
@@ -96,10 +96,10 @@
 /* Tunables */
 
 /*
- * EM_TXD: Maximum number of Transmit Descriptors
+ * EM_MAX_TXD: Maximum number of Transmit Descriptors
  * Valid Range: 80-256 for 82542 and 82543-based adapters
  *              80-4096 for others
- * Default Value: 256
+ * Default Value: 1024
  *   This value is the number of transmit descriptors allocated by the driver.
  *   Increasing this value allows the driver to queue more transmits. Each
  *   descriptor is 16 bytes.
@@ -111,12 +111,13 @@
 #define EM_MAX_TXD		4096
 #define EM_DEFAULT_TXD          1024
 #define EM_DEFAULT_MULTI_TXD	4096
+#define IGB_MAX_TXD		4096
 
 /*
- * EM_RXD - Maximum number of receive Descriptors
+ * EM_MAX_RXD - Maximum number of receive Descriptors
  * Valid Range: 80-256 for 82542 and 82543-based adapters
  *              80-4096 for others
- * Default Value: 256
+ * Default Value: 1024
  *   This value is the number of receive descriptors allocated by the driver.
  *   Increasing this value allows the driver to buffer more incoming packets.
  *   Each descriptor is 16 bytes.  A receive buffer is also allocated for each
@@ -129,6 +130,7 @@
 #define EM_MAX_RXD		4096
 #define EM_DEFAULT_RXD          1024
 #define EM_DEFAULT_MULTI_RXD	4096
+#define IGB_MAX_RXD		4096
 
 /*
  * EM_TIDV - Transmit Interrupt Delay Value