linux-kernel - [PATCH 5/13] cxgb3 - Expose HW memory page info

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Date:	Fri, 10 Aug 2007 23:29:54 -0700
From:	Divy Le Ray <divy@...lsio.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	swise@...ngridcomputing.com
Subject: [PATCH 5/13] cxgb3 - Expose HW memory page info

From: Divy Le Ray <divy@...lsio.com>

Let the RDMA driver get HW page info to work around HW issues.
Assign explicit enum values.

Signed-off-by: Divy Le Ray <divy@...lsio.com>
---

 drivers/net/cxgb3/cxgb3_ctl_defs.h |   52 +++++++++++++++++++++---------------
 drivers/net/cxgb3/cxgb3_offload.c  |    7 +++++
 2 files changed, 38 insertions(+), 21 deletions(-)

diff --git a/drivers/net/cxgb3/cxgb3_ctl_defs.h b/drivers/net/cxgb3/cxgb3_ctl_defs.h
index 2095dda..6c4f320 100644
--- a/drivers/net/cxgb3/cxgb3_ctl_defs.h
+++ b/drivers/net/cxgb3/cxgb3_ctl_defs.h
@@ -33,27 +33,29 @@
 #define _CXGB3_OFFLOAD_CTL_DEFS_H
 
 enum {
-	GET_MAX_OUTSTANDING_WR,
-	GET_TX_MAX_CHUNK,
-	GET_TID_RANGE,
-	GET_STID_RANGE,
-	GET_RTBL_RANGE,
-	GET_L2T_CAPACITY,
-	GET_MTUS,
-	GET_WR_LEN,
-	GET_IFF_FROM_MAC,
-	GET_DDP_PARAMS,
-	GET_PORTS,
-
-	ULP_ISCSI_GET_PARAMS,
-	ULP_ISCSI_SET_PARAMS,
-
-	RDMA_GET_PARAMS,
-	RDMA_CQ_OP,
-	RDMA_CQ_SETUP,
-	RDMA_CQ_DISABLE,
-	RDMA_CTRL_QP_SETUP,
-	RDMA_GET_MEM,
+	GET_MAX_OUTSTANDING_WR 	= 0,
+	GET_TX_MAX_CHUNK	= 1,
+	GET_TID_RANGE		= 2,
+	GET_STID_RANGE		= 3,
+	GET_RTBL_RANGE		= 4,
+	GET_L2T_CAPACITY	= 5,
+	GET_MTUS		= 6,
+	GET_WR_LEN		= 7,
+	GET_IFF_FROM_MAC	= 8,
+	GET_DDP_PARAMS		= 9,
+	GET_PORTS		= 10,
+
+	ULP_ISCSI_GET_PARAMS	= 11,
+	ULP_ISCSI_SET_PARAMS	= 12,
+
+	RDMA_GET_PARAMS		= 13,
+	RDMA_CQ_OP		= 14,
+	RDMA_CQ_SETUP		= 15,
+	RDMA_CQ_DISABLE		= 16,
+	RDMA_CTRL_QP_SETUP	= 17,
+	RDMA_GET_MEM		= 18,
+
+	GET_RX_PAGE_INFO	= 50,
 };
 
 /*
@@ -161,4 +163,12 @@ struct rdma_ctrlqp_setup {
 	unsigned long long base_addr;
 	unsigned int size;
 };
+
+/*
+ * Offload TX/RX page information.
+ */
+struct ofld_page_info {
+	unsigned int page_size;  /* Page size, should be a power of 2 */
+	unsigned int num;        /* Number of pages */
+};
 #endif				/* _CXGB3_OFFLOAD_CTL_DEFS_H */
diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index e620ed4..522c1be 100644
--- a/drivers/net/cxgb3/cxgb3_offload.c
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -317,6 +317,8 @@ static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 	struct iff_mac *iffmacp;
 	struct ddp_params *ddpp;
 	struct adap_ports *ports;
+	struct ofld_page_info *rx_page_info;
+	struct tp_params *tp = &adapter->params.tp;
 	int i;
 
 	switch (req) {
@@ -382,6 +384,11 @@ static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 		if (!offload_running(adapter))
 			return -EAGAIN;
 		return cxgb_rdma_ctl(adapter, req, data);
+	case GET_RX_PAGE_INFO:
+		rx_page_info = data;
+		rx_page_info->page_size = tp->rx_pg_size;
+		rx_page_info->num = tp->rx_num_pgs;
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
-
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