[ofa-general] [PATCH -3] ib_mthca checksum offload support

[Eli Cohen]

Add checksum offload support in mthca

Signed-off-by: Eli Cohen <eli at mellnaox.co.il>

---

Index: linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_cmd.c
===================================================================
--- linux-2.6.23-rc1.orig/drivers/infiniband/hw/mthca/mthca_cmd.c	2007-08-15 20:50:15.000000000 +0300
+++ linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_cmd.c	2007-08-15 20:50:29.000000000 +0300
@@ -1377,6 +1377,9 @@ int mthca_INIT_HCA(struct mthca_dev *dev
 		MTHCA_PUT(inbox, param->uarc_base,   INIT_HCA_UAR_CTX_BASE_OFFSET);
 	}
 
+	if (dev->device_cap_flags & IB_DEVICE_IP_CSUM)
+		*(inbox + INIT_HCA_FLAGS2_OFFSET / 4) |= cpu_to_be32(7 << 3);
+
 	err = mthca_cmd(dev, mailbox->dma, 0, 0, CMD_INIT_HCA, HZ, status);
 
 	mthca_free_mailbox(dev, mailbox);
Index: linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_cmd.h
===================================================================
--- linux-2.6.23-rc1.orig/drivers/infiniband/hw/mthca/mthca_cmd.h	2007-08-15 20:50:15.000000000 +0300
+++ linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_cmd.h	2007-08-15 20:50:29.000000000 +0300
@@ -103,6 +103,7 @@ enum {
 	DEV_LIM_FLAG_RAW_IPV6           = 1 << 4,
 	DEV_LIM_FLAG_RAW_ETHER          = 1 << 5,
 	DEV_LIM_FLAG_SRQ                = 1 << 6,
+	DEV_LIM_FLAG_IPOIB_CSUM		= 1 << 7,
 	DEV_LIM_FLAG_BAD_PKEY_CNTR      = 1 << 8,
 	DEV_LIM_FLAG_BAD_QKEY_CNTR      = 1 << 9,
 	DEV_LIM_FLAG_MW                 = 1 << 16,
Index: linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_cq.c
===================================================================
--- linux-2.6.23-rc1.orig/drivers/infiniband/hw/mthca/mthca_cq.c	2007-08-15 20:50:15.000000000 +0300
+++ linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_cq.c	2007-08-15 20:50:29.000000000 +0300
@@ -119,7 +119,8 @@ struct mthca_cqe {
 	__be32 my_qpn;
 	__be32 my_ee;
 	__be32 rqpn;
-	__be16 sl_g_mlpath;
+	u8	sl_ipok;
+	u8	g_mlpath;
 	__be16 rlid;
 	__be32 imm_etype_pkey_eec;
 	__be32 byte_cnt;
@@ -498,6 +499,7 @@ static inline int mthca_poll_one(struct 
 	int is_send;
 	int free_cqe = 1;
 	int err = 0;
+	u16 checksum;
 
 	cqe = next_cqe_sw(cq);
 	if (!cqe)
@@ -646,6 +648,10 @@ static inline int mthca_poll_one(struct 
 		entry->pkey_index  = be32_to_cpu(cqe->imm_etype_pkey_eec) >> 16;
 		entry->wc_flags   |= be16_to_cpu(cqe->sl_g_mlpath) & 0x80 ?
 					IB_WC_GRH : 0;
+		checksum = (be32_to_cpu(cqe->rqpn) >> 24) |
+				((be32_to_cpu(cqe->my_ee) >> 16) & 0xff00);
+		entry->csum_ok = (cqe->sl_ipok & 1 && checksum == 0xffff);
+		entry->csum = checksum;
 	}
 
 	entry->status = IB_WC_SUCCESS;
Index: linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_main.c
===================================================================
--- linux-2.6.23-rc1.orig/drivers/infiniband/hw/mthca/mthca_main.c	2007-08-15 20:50:15.000000000 +0300
+++ linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_main.c	2007-08-15 20:50:29.000000000 +0300
@@ -289,6 +289,10 @@ static int mthca_dev_lim(struct mthca_de
 	if (dev_lim->flags & DEV_LIM_FLAG_SRQ)
 		mdev->mthca_flags |= MTHCA_FLAG_SRQ;
 
+	if (mthca_is_memfree(mdev))
+		if (dev_lim->flags & DEV_LIM_FLAG_IPOIB_CSUM)
+			mdev->device_cap_flags |= IB_DEVICE_IP_CSUM;
+
 	return 0;
 }
 
Index: linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_qp.c
===================================================================
--- linux-2.6.23-rc1.orig/drivers/infiniband/hw/mthca/mthca_qp.c	2007-08-15 20:50:15.000000000 +0300
+++ linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_qp.c	2007-08-15 20:50:29.000000000 +0300
@@ -2024,6 +2024,10 @@ int mthca_arbel_post_send(struct ib_qp *
 			 cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
 			((wr->send_flags & IB_SEND_SOLICITED) ?
 			 cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
+			((wr->send_flags & IB_SEND_IP_CSUM) ?
+			 cpu_to_be32(MTHCA_NEXT_IP_CSUM) : 0)   |
+			((wr->send_flags & IB_SEND_UDP_TCP_CSUM) ?
+			 cpu_to_be32(MTHCA_NEXT_TCP_UDP_CSUM) : 0)   |
 			cpu_to_be32(1);
 		if (wr->opcode == IB_WR_SEND_WITH_IMM ||
 		    wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
Index: linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_wqe.h
===================================================================
--- linux-2.6.23-rc1.orig/drivers/infiniband/hw/mthca/mthca_wqe.h	2007-08-15 20:50:15.000000000 +0300
+++ linux-2.6.23-rc1/drivers/infiniband/hw/mthca/mthca_wqe.h	2007-08-15 20:50:29.000000000 +0300
@@ -38,14 +38,15 @@
 #include <linux/types.h>
 
 enum {
-	MTHCA_NEXT_DBD       = 1 << 7,
-	MTHCA_NEXT_FENCE     = 1 << 6,
-	MTHCA_NEXT_CQ_UPDATE = 1 << 3,
-	MTHCA_NEXT_EVENT_GEN = 1 << 2,
-	MTHCA_NEXT_SOLICIT   = 1 << 1,
-
-	MTHCA_MLX_VL15       = 1 << 17,
-	MTHCA_MLX_SLR        = 1 << 16
+	MTHCA_NEXT_DBD          = 1 << 7,
+	MTHCA_NEXT_FENCE        = 1 << 6,
+	MTHCA_NEXT_CQ_UPDATE    = 1 << 3,
+	MTHCA_NEXT_EVENT_GEN    = 1 << 2,
+	MTHCA_NEXT_SOLICIT      = 1 << 1,
+	MTHCA_NEXT_IP_CSUM      = 1 << 4,
+	MTHCA_NEXT_TCP_UDP_CSUM = 1 << 5,
+	MTHCA_MLX_VL15          = 1 << 17,
+	MTHCA_MLX_SLR           = 1 << 16
 };
 
 enum {