linux-kernel - [PATCH v4 1/2] RDMA/rxe: use RXE_MAX_WQE

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Date:   Thu, 16 Jan 2020 10:30:11 -0800
From:   rao Shoaib <rao.shoaib@...cle.com>
To:     linux-rdma@...r.kernel.org
Cc:     jgg@...pe.ca, monis@...lanox.com, dledford@...hat.com,
        sean.hefty@...el.com, hal.rosenstock@...il.com,
        linux-kernel@...r.kernel.org, Rao Shoaib <rao.shoaib@...cle.com>
Subject: [PATCH v4 1/2] RDMA/rxe: use RXE_MAX_WQE_SIZE to enforce limits

From: Rao Shoaib <rao.shoaib@...cle.com>

Introduce RXE_MAX_WQE_SIZE to impose limits on max SGE's and inline data
size

Signed-off-by: Rao Shoaib <rao.shoaib@...cle.com>
---
 drivers/infiniband/sw/rxe/rxe_param.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_param.h b/drivers/infiniband/sw/rxe/rxe_param.h
index 353c666..f59616b 100644
--- a/drivers/infiniband/sw/rxe/rxe_param.h
+++ b/drivers/infiniband/sw/rxe/rxe_param.h
@@ -34,6 +34,8 @@
 #ifndef RXE_PARAM_H
 #define RXE_PARAM_H
 
+#include <uapi/rdma/rdma_user_rxe.h>
+
 static inline enum ib_mtu rxe_mtu_int_to_enum(int mtu)
 {
 	if (mtu < 256)
@@ -64,7 +66,6 @@ enum rxe_device_param {
 	RXE_PAGE_SIZE_CAP		= 0xfffff000,
 	RXE_MAX_QP			= 0x10000,
 	RXE_MAX_QP_WR			= 0x4000,
-	RXE_MAX_INLINE_DATA		= 400,
 	RXE_DEVICE_CAP_FLAGS		= IB_DEVICE_BAD_PKEY_CNTR
 					| IB_DEVICE_BAD_QKEY_CNTR
 					| IB_DEVICE_AUTO_PATH_MIG
@@ -77,6 +78,10 @@ enum rxe_device_param {
 					| IB_DEVICE_MEM_MGT_EXTENSIONS
 					| IB_DEVICE_ALLOW_USER_UNREG,
 	RXE_MAX_SGE			= 32,
+	RXE_MAX_WQE_SIZE		= sizeof(struct rxe_send_wqe) +
+					  sizeof(struct ib_sge) * RXE_MAX_SGE,
+	RXE_MAX_INLINE_DATA		= RXE_MAX_WQE_SIZE -
+					  sizeof(struct rxe_send_wqe),
 	RXE_MAX_SGE_RD			= 32,
 	RXE_MAX_CQ			= 16384,
 	RXE_MAX_LOG_CQE			= 15,
-- 
1.8.3.1