RDMA/ocrdma: Dont use PD 0 for userpace CQ DB

Create_CQ verb doesn't provide a PD pointer.  So, until now we are
creating all (both userspace and kernel) CQ DB regions from PD0.  This
will result in mmapping PD0 to applications.  A rogue userspace
application can mess things up.

Also more serious issues is even the be2net NIC uses PD0.

This patch addresses this problem by:

1) Create a PD page for every userspace application when the
   alloc_ucontext is called. This will be destroyed in
   dealloc_ucontext.
2) All CQs for that context will use the PD allocated in ucontext.
3) The first create_PD call from application will result in returning
   the PD address from its ucontext (no new PD will be created).
4) For subsecquent create_pd calls from application, we create new PDs for
   the application.
Signed-off-by: Naresh Gottumukkala <bgottumukkala@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/ocrdma/ocrdma.h

@@ -324,6 +324,9 @@ struct ocrdma_ucontext {
 
 	struct list_head mm_head;
 	struct mutex mm_list_lock; /* protects list entries of mm type */
+	struct ocrdma_pd *cntxt_pd;
+	int pd_in_use;
+
 	struct {
 		u32 *va;
 		dma_addr_t pa;

drivers/infiniband/hw/ocrdma/ocrdma_hw.c

@@ -1309,7 +1309,7 @@ static void ocrdma_unbind_eq(struct ocrdma_dev *dev, u16 eq_id)
 }
 
 int ocrdma_mbx_create_cq(struct ocrdma_dev *dev, struct ocrdma_cq *cq,
-			 int entries, int dpp_cq)
+			 int entries, int dpp_cq, u16 pd_id)
 {
 	int status = -ENOMEM; int max_hw_cqe;
 	struct pci_dev *pdev = dev->nic_info.pdev;
@@ -1357,7 +1357,7 @@ int ocrdma_mbx_create_cq(struct ocrdma_dev *dev, struct ocrdma_cq *cq,
 	cmd->cmd.ev_cnt_flags = OCRDMA_CREATE_CQ_DEF_FLAGS;
 
 	cq->eqn = ocrdma_bind_eq(dev);
-	cmd->cmd.req.rsvd_version = OCRDMA_CREATE_CQ_VER2;
+	cmd->cmd.req.rsvd_version = OCRDMA_CREATE_CQ_VER3;
 	cqe_count = cq->len / cqe_size;
 	if (cqe_count > 1024) {
 		/* Set cnt to 3 to indicate more than 1024 cq entries */
@@ -1393,6 +1393,7 @@ int ocrdma_mbx_create_cq(struct ocrdma_dev *dev, struct ocrdma_cq *cq,
 		cq->phase_change = true;
 	}
 
+	cmd->cmd.pd_id = pd_id; /* valid only for v3 */
 	ocrdma_build_q_pages(&cmd->cmd.pa[0], hw_pages, cq->pa, page_size);
 	status = ocrdma_mbx_cmd(dev, (struct ocrdma_mqe *)cmd);
 	if (status)

drivers/infiniband/hw/ocrdma/ocrdma_hw.h

@@ -78,6 +78,11 @@ static inline void ocrdma_copy_le32_to_cpu(void *dst, void *src, u32 len)
 #endif
 }
 
+static inline u64 ocrdma_get_db_addr(struct ocrdma_dev *dev, u32 pdid)
+{
+	return dev->nic_info.unmapped_db + (pdid * dev->nic_info.db_page_size);
+}
+
 int ocrdma_init_hw(struct ocrdma_dev *);
 void ocrdma_cleanup_hw(struct ocrdma_dev *);
 
@@ -100,7 +105,7 @@ int ocrdma_mbx_dealloc_lkey(struct ocrdma_dev *, int fmr, u32 lkey);
 int ocrdma_reg_mr(struct ocrdma_dev *, struct ocrdma_hw_mr *hwmr,
 			u32 pd_id, int acc);
 int ocrdma_mbx_create_cq(struct ocrdma_dev *, struct ocrdma_cq *,
-				int entries, int dpp_cq);
+				int entries, int dpp_cq, u16 pd_id);
 int ocrdma_mbx_destroy_cq(struct ocrdma_dev *, struct ocrdma_cq *);
 
 int ocrdma_mbx_create_qp(struct ocrdma_qp *, struct ib_qp_init_attr *attrs,

drivers/infiniband/hw/ocrdma/ocrdma_main.c

@@ -326,6 +326,7 @@ static int ocrdma_register_device(struct ocrdma_dev *dev)
 	dev->ibdev.req_notify_cq = ocrdma_arm_cq;
 
 	dev->ibdev.get_dma_mr = ocrdma_get_dma_mr;
+	dev->ibdev.reg_phys_mr = ocrdma_reg_kernel_mr;
 	dev->ibdev.dereg_mr = ocrdma_dereg_mr;
 	dev->ibdev.reg_user_mr = ocrdma_reg_user_mr;
 

drivers/infiniband/hw/ocrdma/ocrdma_sli.h

@@ -547,6 +547,7 @@ enum {
 
 enum {
 	OCRDMA_CREATE_CQ_VER2			= 2,
+	OCRDMA_CREATE_CQ_VER3                   = 3,
 
 	OCRDMA_CREATE_CQ_PAGE_CNT_MASK		= 0xFFFF,
 	OCRDMA_CREATE_CQ_PAGE_SIZE_SHIFT	= 16,
@@ -580,7 +581,8 @@ struct ocrdma_create_cq_cmd {
 	u32 pgsz_pgcnt;
 	u32 ev_cnt_flags;
 	u32 eqn;
-	u32 cqe_count;
+	u16 cqe_count;
+	u16 pd_id;
 	u32 rsvd6;
 	struct ocrdma_pa pa[OCRDMA_CREATE_CQ_MAX_PAGES];
 };