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authorEddie Wai <eddie.wai@broadcom.com>2011-05-16 11:13:20 -0700
committerJames Bottomley <jbottomley@parallels.com>2011-05-24 12:41:10 -0400
commit9ae58e144df1a4ecc91dcd9eea5a3f4a6d13b5fc (patch)
treecc6ef10a0aa8d4a13aebc7d07bede9eba51069fa /drivers/scsi/bnx2i/bnx2i.h
parentd5307a078bb0288945c900c6f4a2fd77ba6d0817 (diff)
downloadop-kernel-dev-9ae58e144df1a4ecc91dcd9eea5a3f4a6d13b5fc.zip
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[SCSI] bnx2i: Optimized the iSCSI offload performance
Modified the event coalescing code for iSCSI offload to combat both corner cases and optimize performance as follows: 1. Added mechanism to loop back a second time to process any leftover CQEs that was generated by the hardware during the time the driver is busy processing previous CQEs in the bh. This not only helps the performance but also fixes the corner case when no more CQEs are being generated in the pipeline; so those leftover CQEs will get a a chance to be processed. 2. Added ARM_CQE_FP to distinguish between fast path arming versus slow path arming. This change will guarantee that the CQEs will always get a chance to be re-armed during fast path completions. 3. Removed the inline event coalescing division for perf optimization. Also fixed a division-by-zero error when the event_coal_div module param was set to 0. 4. Changed the default SQ WQEs size from 256 to 128 to match chip default. 5. Changed the cmd_per_lun from 32 to 24. Signed-off-by: Eddie Wai <eddie.wai@broadcom.com> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <jbottomley@parallels.com>
Diffstat (limited to 'drivers/scsi/bnx2i/bnx2i.h')
-rw-r--r--drivers/scsi/bnx2i/bnx2i.h16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/scsi/bnx2i/bnx2i.h b/drivers/scsi/bnx2i/bnx2i.h
index cfd5902..6bdd25a 100644
--- a/drivers/scsi/bnx2i/bnx2i.h
+++ b/drivers/scsi/bnx2i/bnx2i.h
@@ -66,11 +66,11 @@
#define BD_SPLIT_SIZE 32768
/* min, max & default values for SQ/RQ/CQ size, configurable via' modparam */
-#define BNX2I_SQ_WQES_MIN 16
-#define BNX2I_570X_SQ_WQES_MAX 128
-#define BNX2I_5770X_SQ_WQES_MAX 512
-#define BNX2I_570X_SQ_WQES_DEFAULT 128
-#define BNX2I_5770X_SQ_WQES_DEFAULT 256
+#define BNX2I_SQ_WQES_MIN 16
+#define BNX2I_570X_SQ_WQES_MAX 128
+#define BNX2I_5770X_SQ_WQES_MAX 512
+#define BNX2I_570X_SQ_WQES_DEFAULT 128
+#define BNX2I_5770X_SQ_WQES_DEFAULT 128
#define BNX2I_570X_CQ_WQES_MAX 128
#define BNX2I_5770X_CQ_WQES_MAX 512
@@ -115,6 +115,7 @@
#define BNX2X_MAX_CQS 8
#define CNIC_ARM_CQE 1
+#define CNIC_ARM_CQE_FP 2
#define CNIC_DISARM_CQE 0
#define REG_RD(__hba, offset) \
@@ -666,7 +667,9 @@ enum {
* after HBA reset is completed by bnx2i/cnic/bnx2
* modules
* @state: tracks offload connection state machine
- * @teardown_mode: indicates if conn teardown is abortive or orderly
+ * @timestamp: tracks the start time when the ep begins to connect
+ * @num_active_cmds: tracks the number of outstanding commands for this ep
+ * @ec_shift: the amount of shift as part of the event coal calc
* @qp: QP information
* @ids: contains chip allocated *context id* & driver assigned
* *iscsi cid*
@@ -685,6 +688,7 @@ struct bnx2i_endpoint {
u32 state;
unsigned long timestamp;
int num_active_cmds;
+ u32 ec_shift;
struct qp_info qp;
struct ep_handles ids;
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