1 files changed, 202 insertions, 65 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
index e641088c14dc..349576ff3845 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -44,7 +44,7 @@
 #include <rdma/ib_verbs.h>
 #include <rdma/ib_sa.h>
 #include <rdma/ib_cm.h>
-#include <rdma/ib_fmr_pool.h>
+#include <rdma/rdma_cm.h>
 
 enum {
 	SRP_PATH_REC_TIMEOUT_MS	= 1000,
@@ -54,31 +54,35 @@ enum {
 	SRP_DLID_REDIRECT	= 2,
 	SRP_STALE_CONN		= 3,
 
-	SRP_MAX_LUN		= 512,
 	SRP_DEF_SG_TABLESIZE	= 12,
 
-	SRP_RQ_SHIFT    	= 6,
-	SRP_RQ_SIZE		= 1 << SRP_RQ_SHIFT,
-
-	SRP_SQ_SIZE		= SRP_RQ_SIZE,
+	SRP_DEFAULT_QUEUE_SIZE	= 1 << 6,
 	SRP_RSP_SQ_SIZE		= 1,
-	SRP_REQ_SQ_SIZE		= SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
 	SRP_TSK_MGMT_SQ_SIZE	= 1,
-	SRP_CMD_SQ_SIZE		= SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
+	SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
+				  SRP_TSK_MGMT_SQ_SIZE,
 
-	SRP_TAG_NO_REQ		= ~0U,
-	SRP_TAG_TSK_MGMT	= 1U << 31,
+	SRP_MAX_PAGES_PER_MR	= 512,
 
-	SRP_FMR_SIZE		= 512,
-	SRP_FMR_MIN_SIZE	= 128,
-	SRP_FMR_POOL_SIZE	= 1024,
-	SRP_FMR_DIRTY_SIZE	= SRP_FMR_POOL_SIZE / 4,
+	SRP_MAX_ADD_CDB_LEN	= 16,
+
+	SRP_MAX_IMM_SGE		= 2,
+	SRP_MAX_SGE		= SRP_MAX_IMM_SGE + 1,
+	/*
+	 * Choose the immediate data offset such that a 32 byte CDB still fits.
+	 */
+	SRP_IMM_DATA_OFFSET	= sizeof(struct srp_cmd) +
+				  SRP_MAX_ADD_CDB_LEN +
+				  sizeof(struct srp_imm_buf),
+};
 
-	SRP_MAP_ALLOW_FMR	= 0,
-	SRP_MAP_NO_FMR		= 1,
+enum {
+	SRP_TAG_NO_REQ		= ~0U,
+	SRP_TAG_TSK_MGMT	= BIT(31),
 };
 
 enum srp_target_state {
+	SRP_TARGET_SCANNING,
 	SRP_TARGET_LIVE,
 	SRP_TARGET_REMOVED,
 };
@@ -89,102 +93,179 @@ enum srp_iu_type {
 	SRP_IU_RSP,
 };
 
+/*
+ * RDMA adapter in the initiator system.
+ *
+ * @dev_list: List of RDMA ports associated with this RDMA adapter (srp_host).
+ * @mr_page_mask: HCA memory registration page mask.
+ * @mr_page_size: HCA memory registration page size.
+ * @mr_max_size: Maximum size in bytes of a single FR registration request.
+ */
 struct srp_device {
 	struct list_head	dev_list;
 	struct ib_device       *dev;
 	struct ib_pd	       *pd;
-	struct ib_mr	       *mr;
-	struct ib_fmr_pool     *fmr_pool;
-	u64			fmr_page_mask;
-	int			fmr_page_size;
-	int			fmr_max_size;
+	u32			global_rkey;
+	u64			mr_page_mask;
+	int			mr_page_size;
+	int			mr_max_size;
+	int			max_pages_per_mr;
+	bool			has_fr;
+	bool			use_fast_reg;
 };
 
+/*
+ * One port of an RDMA adapter in the initiator system.
+ *
+ * @target_list: List of connected target ports (struct srp_target_port).
+ * @target_lock: Protects @target_list.
+ */
 struct srp_host {
 	struct srp_device      *srp_dev;
-	u8			port;
+	u32			port;
 	struct device		dev;
 	struct list_head	target_list;
 	spinlock_t		target_lock;
-	struct completion	released;
 	struct list_head	list;
+	struct mutex		add_target_mutex;
 };
 
 struct srp_request {
-	struct list_head	list;
 	struct scsi_cmnd       *scmnd;
 	struct srp_iu	       *cmd;
-	struct ib_pool_fmr    **fmr_list;
-	u64		       *map_page;
+	struct srp_fr_desc     **fr_list;
 	struct srp_direct_buf  *indirect_desc;
 	dma_addr_t		indirect_dma_addr;
-	short			nfmr;
-	short			index;
+	short			nmdesc;
+	struct ib_cqe		reg_cqe;
 };
 
-struct srp_target_port {
+/**
+ * struct srp_rdma_ch
+ * @comp_vector: Completion vector used by this RDMA channel.
+ * @max_it_iu_len: Maximum initiator-to-target information unit length.
+ * @max_ti_iu_len: Maximum target-to-initiator information unit length.
+ */
+struct srp_rdma_ch {
 	/* These are RW in the hot path, and commonly used together */
 	struct list_head	free_tx;
-	struct list_head	free_reqs;
 	spinlock_t		lock;
 	s32			req_lim;
 
 	/* These are read-only in the hot path */
-	struct ib_cq	       *send_cq ____cacheline_aligned_in_smp;
+	struct srp_target_port *target ____cacheline_aligned_in_smp;
+	struct ib_cq	       *send_cq;
 	struct ib_cq	       *recv_cq;
 	struct ib_qp	       *qp;
+	struct srp_fr_pool     *fr_pool;
+	uint32_t		max_it_iu_len;
+	uint32_t		max_ti_iu_len;
+	u8			max_imm_sge;
+	bool			use_imm_data;
+
+	/* Everything above this point is used in the hot path of
+	 * command processing. Try to keep them packed into cachelines.
+	 */
+
+	struct completion	done;
+	int			status;
+
+	union {
+		struct ib_cm {
+			struct sa_path_rec	path;
+			struct ib_sa_query	*path_query;
+			int			path_query_id;
+			struct ib_cm_id		*cm_id;
+		} ib_cm;
+		struct rdma_cm {
+			struct rdma_cm_id	*cm_id;
+		} rdma_cm;
+	};
+
+	struct srp_iu	      **tx_ring;
+	struct srp_iu	      **rx_ring;
+	int			comp_vector;
+
+	u64			tsk_mgmt_tag;
+	struct completion	tsk_mgmt_done;
+	u8			tsk_mgmt_status;
+	bool			connected;
+};
+
+/**
+ * struct srp_target_port - RDMA port in the SRP target system
+ * @comp_vector: Completion vector used by the first RDMA channel created for
+ *   this target port.
+ */
+struct srp_target_port {
+	/* read and written in the hot path */
+	spinlock_t		lock;
+
+	/* read only in the hot path */
+	u32			global_rkey;
+	struct srp_rdma_ch	*ch;
+	struct net		*net;
+	u32			ch_count;
 	u32			lkey;
-	u32			rkey;
 	enum srp_target_state	state;
-	unsigned int		max_iu_len;
+	uint32_t		max_it_iu_size;
 	unsigned int		cmd_sg_cnt;
 	unsigned int		indirect_size;
 	bool			allow_ext_sg;
-	bool			transport_offline;
-
-	/* Everything above this point is used in the hot path of
-	 * command processing. Try to keep them packed into cachelines.
-	 */
 
+	/* other member variables */
+	union ib_gid		sgid;
 	__be64			id_ext;
 	__be64			ioc_guid;
-	__be64			service_id;
 	__be64			initiator_ext;
 	u16			io_class;
 	struct srp_host	       *srp_host;
 	struct Scsi_Host       *scsi_host;
+	struct srp_rport       *rport;
 	char			target_name[32];
 	unsigned int		scsi_id;
 	unsigned int		sg_tablesize;
+	unsigned int		target_can_queue;
+	int			mr_pool_size;
+	int			mr_per_cmd;
+	int			queue_size;
 	int			comp_vector;
-
-	struct ib_sa_path_rec	path;
-	__be16			orig_dgid[8];
-	struct ib_sa_query     *path_query;
-	int			path_query_id;
+	int			tl_retry_count;
+
+	bool			using_rdma_cm;
+
+	union {
+		struct {
+			__be64			service_id;
+			union ib_gid		orig_dgid;
+			__be16			pkey;
+		} ib_cm;
+		struct {
+			union {
+				struct sockaddr_in	ip4;
+				struct sockaddr_in6	ip6;
+				struct sockaddr		sa;
+				struct sockaddr_storage ss;
+			} src;
+			union {
+				struct sockaddr_in	ip4;
+				struct sockaddr_in6	ip6;
+				struct sockaddr		sa;
+				struct sockaddr_storage ss;
+			} dst;
+			bool src_specified;
+		} rdma_cm;
+	};
 
 	u32			rq_tmo_jiffies;
-	bool			connected;
-
-	struct ib_cm_id	       *cm_id;
-
-	int			max_ti_iu_len;
 
 	int			zero_req_lim;
 
-	struct srp_iu	       *tx_ring[SRP_SQ_SIZE];
-	struct srp_iu	       *rx_ring[SRP_RQ_SIZE];
-	struct srp_request	req_ring[SRP_CMD_SQ_SIZE];
-
+	struct work_struct	tl_err_work;
 	struct work_struct	remove_work;
 
 	struct list_head	list;
-	struct completion	done;
-	int			status;
 	bool			qp_in_error;
-
-	struct completion	tsk_mgmt_done;
-	u8			tsk_mgmt_status;
 };
 
 struct srp_iu {
@@ -193,21 +274,77 @@ struct srp_iu {
 	void		       *buf;
 	size_t			size;
 	enum dma_data_direction	direction;
+	u32			num_sge;
+	struct ib_sge		sge[SRP_MAX_SGE];
+	struct ib_cqe		cqe;
+};
+
+/**
+ * struct srp_fr_desc - fast registration work request arguments
+ * @entry: Entry in srp_fr_pool.free_list.
+ * @mr:    Memory region.
+ * @frpl:  Fast registration page list.
+ */
+struct srp_fr_desc {
+	struct list_head		entry;
+	struct ib_mr			*mr;
 };
 
+/**
+ * struct srp_fr_pool - pool of fast registration descriptors
+ *
+ * An entry is available for allocation if and only if it occurs in @free_list.
+ *
+ * @size:      Number of descriptors in this pool.
+ * @max_page_list_len: Maximum fast registration work request page list length.
+ * @lock:      Protects free_list.
+ * @free_list: List of free descriptors.
+ * @desc:      Fast registration descriptor pool.
+ */
+struct srp_fr_pool {
+	int			size;
+	int			max_page_list_len;
+	spinlock_t		lock;
+	struct list_head	free_list;
+	struct srp_fr_desc	desc[] __counted_by(size);
+};
+
+/**
+ * struct srp_map_state - per-request DMA memory mapping state
+ * @desc:	    Pointer to the element of the SRP buffer descriptor array
+ *		    that is being filled in.
+ * @pages:	    Array with DMA addresses of pages being considered for
+ *		    memory registration.
+ * @base_dma_addr:  DMA address of the first page that has not yet been mapped.
+ * @dma_len:	    Number of bytes that will be registered with the next FR
+ *                  memory registration call.
+ * @total_len:	    Total number of bytes in the sg-list being mapped.
+ * @npages:	    Number of page addresses in the pages[] array.
+ * @nmdesc:	    Number of FR memory descriptors used for mapping.
+ * @ndesc:	    Number of SRP buffer descriptors that have been filled in.
+ */
 struct srp_map_state {
-	struct ib_pool_fmr    **next_fmr;
+	union {
+		struct {
+			struct srp_fr_desc **next;
+			struct srp_fr_desc **end;
+		} fr;
+		struct {
+			void		   **next;
+			void		   **end;
+		} gen;
+	};
 	struct srp_direct_buf  *desc;
-	u64		       *pages;
+	union {
+		u64			*pages;
+		struct scatterlist	*sg;
+	};
 	dma_addr_t		base_dma_addr;
-	u32			fmr_len;
+	u32			dma_len;
 	u32			total_len;
 	unsigned int		npages;
-	unsigned int		nfmr;
+	unsigned int		nmdesc;
 	unsigned int		ndesc;
-	struct scatterlist     *unmapped_sg;
-	int			unmapped_index;
-	dma_addr_t		unmapped_addr;
 };
 
 #endif /* IB_SRP_H */