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authorAlex Tabachnik <alext@mellanox.com>2012-09-23 15:17:44 +0000
committerRoland Dreier <roland@purestorage.com>2012-10-03 21:26:49 -0700
commit5a33a6694942bc86e487d00cd8feebeae5f14546 (patch)
treec12494add1644126fb8435e85bae72dd49269952 /drivers/infiniband/ulp/iser/iscsi_iser.h
parent7a9a2970b5c1c2ce73d4bb84edaa7ebf13e0c841 (diff)
downloadvexpress-lsk-5a33a6694942bc86e487d00cd8feebeae5f14546.tar.gz
IB/iser: Add more RX CQs to scale out processing of SCSI responses
RX/TX CQs will now be selected from a per HCA pool. For the RX flow this has the effect of using different interrupt vectors when using low level drivers (such as mlx4) that map the "vector" param provided by the ULP on CQ creation to a dedicated IRQ/MSI-X vector. This allows the RX flow processing of IO responses to be distributed across multiple CPUs. QPs (--> iSER sessions) are assigned to CQs in round robin order using the CQ with the minimum number of sessions attached to it. Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Alex Tabachnik <alext@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/ulp/iser/iscsi_iser.h')
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.h17
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 296be431a0e..ef7d3be46c3 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -177,6 +177,7 @@ struct iser_data_buf {
/* fwd declarations */
struct iser_device;
+struct iser_cq_desc;
struct iscsi_iser_conn;
struct iscsi_iser_task;
struct iscsi_endpoint;
@@ -226,16 +227,21 @@ struct iser_rx_desc {
char pad[ISER_RX_PAD_SIZE];
} __attribute__((packed));
+#define ISER_MAX_CQ 4
+
struct iser_device {
struct ib_device *ib_device;
struct ib_pd *pd;
- struct ib_cq *rx_cq;
- struct ib_cq *tx_cq;
+ struct ib_cq *rx_cq[ISER_MAX_CQ];
+ struct ib_cq *tx_cq[ISER_MAX_CQ];
struct ib_mr *mr;
- struct tasklet_struct cq_tasklet;
+ struct tasklet_struct cq_tasklet[ISER_MAX_CQ];
struct ib_event_handler event_handler;
struct list_head ig_list; /* entry in ig devices list */
int refcount;
+ int cq_active_qps[ISER_MAX_CQ];
+ int cqs_used;
+ struct iser_cq_desc *cq_desc;
};
struct iser_conn {
@@ -287,6 +293,11 @@ struct iser_page_vec {
int data_size;
};
+struct iser_cq_desc {
+ struct iser_device *device;
+ int cq_index;
+};
+
struct iser_global {
struct mutex device_list_mutex;/* */
struct list_head device_list; /* all iSER devices */