qedr: Add support for kernel mode SRQ's

Implement the SRQ specific verbs and update the poll_cq verb to deal with
SRQ completions.

Signed-off-by: Michal Kalderon <michal.kalderon@cavium.com>
Signed-off-by: Yuval Bason <yuval.bason@cavium.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qedr/main.c

@@ -229,6 +229,11 @@ static int qedr_register_device(struct qedr_dev *dev)
 	dev->ibdev.query_qp = qedr_query_qp;
 	dev->ibdev.destroy_qp = qedr_destroy_qp;
 
+	dev->ibdev.create_srq = qedr_create_srq;
+	dev->ibdev.destroy_srq = qedr_destroy_srq;
+	dev->ibdev.modify_srq = qedr_modify_srq;
+	dev->ibdev.query_srq = qedr_query_srq;
+	dev->ibdev.post_srq_recv = qedr_post_srq_recv;
 	dev->ibdev.query_pkey = qedr_query_pkey;
 
 	dev->ibdev.create_ah = qedr_create_ah;

drivers/infiniband/hw/qedr/qedr.h

@@ -58,6 +58,7 @@
 #define QEDR_MSG_RQ   "  RQ"
 #define QEDR_MSG_SQ   "  SQ"
 #define QEDR_MSG_QP   "  QP"
+#define QEDR_MSG_SRQ  " SRQ"
 #define QEDR_MSG_GSI  " GSI"
 #define QEDR_MSG_IWARP  " IW"
 
@@ -171,6 +172,7 @@ struct qedr_dev {
 	struct qedr_qp		*gsi_qp;
 	enum qed_rdma_type	rdma_type;
 	struct qedr_idr		qpidr;
+	struct qedr_idr		srqidr;
 	struct workqueue_struct *iwarp_wq;
 	u16			iwarp_max_mtu;
 
@@ -341,6 +343,34 @@ struct qedr_qp_hwq_info {
 				qed_chain_get_capacity(p_info->pbl)	\
 	} while (0)
 
+struct qedr_srq_hwq_info {
+	u32 max_sges;
+	u32 max_wr;
+	struct qed_chain pbl;
+	u64 p_phys_addr_tbl;
+	u32 wqe_prod;
+	u32 sge_prod;
+	u32 wr_prod_cnt;
+	u32 wr_cons_cnt;
+	u32 num_elems;
+
+	u32 *virt_prod_pair_addr;
+	dma_addr_t phy_prod_pair_addr;
+};
+
+struct qedr_srq {
+	struct ib_srq ibsrq;
+	struct qedr_dev *dev;
+
+	struct qedr_userq	usrq;
+	struct qedr_srq_hwq_info hw_srq;
+	struct ib_umem *prod_umem;
+	u16 srq_id;
+	u32 srq_limit;
+	/* lock to protect srq recv post */
+	spinlock_t lock;
+};
+
 enum qedr_qp_err_bitmap {
 	QEDR_QP_ERR_SQ_FULL = 1,
 	QEDR_QP_ERR_RQ_FULL = 2,
@@ -542,4 +572,9 @@ static inline struct qedr_mr *get_qedr_mr(struct ib_mr *ibmr)
 {
 	return container_of(ibmr, struct qedr_mr, ibmr);
 }
+
+static inline struct qedr_srq *get_qedr_srq(struct ib_srq *ibsrq)
+{
+	return container_of(ibsrq, struct qedr_srq, ibsrq);
+}
 #endif

drivers/infiniband/hw/qedr/qedr_hsi_rdma.h

@@ -161,12 +161,23 @@ struct rdma_rq_sge {
 #define RDMA_RQ_SGE_L_KEY_HI_SHIFT  29
 };
 
+struct rdma_srq_wqe_header {
+	struct regpair wr_id;
+	u8 num_sges /* number of SGEs in WQE */;
+	u8 reserved2[7];
+};
+
 struct rdma_srq_sge {
 	struct regpair addr;
 	__le32 length;
 	__le32 l_key;
 };
 
+union rdma_srq_elm {
+	struct rdma_srq_wqe_header header;
+	struct rdma_srq_sge sge;
+};
+
 /* Rdma doorbell data for flags update */
 struct rdma_pwm_flags_data {
 	__le16 icid; /* internal CID */