smc: work request (WR) base for use by LLC and CDC

The base containers for RDMA transport are work requests and completion
queue entries processed through Infiniband verbs:
* allocate and initialize these areas
* map these areas to DMA
* implement the basic communication consisting of work request posting
  and receival of completion queue events

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/Makefile

@@ -1,2 +1,2 @@
 obj-$(CONFIG_SMC)	+= smc.o
-smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o
+smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o

net/smc/smc.h

@@ -12,6 +12,7 @@
 
 #include <linux/socket.h>
 #include <linux/types.h>
+#include <linux/compiler.h> /* __aligned */
 #include <net/sock.h>
 
 #include "smc_ib.h"
@@ -29,6 +30,10 @@ enum smc_state {		/* possible states of an SMC socket */
 
 struct smc_link_group;
 
+struct smc_wr_rx_hdr {	/* common prefix part of LLC and CDC to demultiplex */
+	u8			type;
+} __aligned(1);
+
 struct smc_connection {
 	struct rb_node		alert_node;
 	struct smc_link_group	*lgr;		/* link group of connection */

net/smc/smc_core.c

@@ -20,6 +20,7 @@
 #include "smc_clc.h"
 #include "smc_core.h"
 #include "smc_ib.h"
+#include "smc_wr.h"
 
 #define SMC_LGR_FREE_DELAY	(600 * HZ)
 
@@ -161,12 +162,20 @@ static int smc_lgr_create(struct smc_sock *smc, __be32 peer_in_addr,
 	lnk->path_mtu = smcibdev->pattr[ibport - 1].active_mtu;
 	get_random_bytes(rndvec, sizeof(rndvec));
 	lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + (rndvec[2] << 16);
+	rc = smc_wr_alloc_link_mem(lnk);
+	if (rc)
+		goto free_lgr;
+	init_waitqueue_head(&lnk->wr_tx_wait);
 
 	smc->conn.lgr = lgr;
 	rwlock_init(&lgr->conns_lock);
 	spin_lock_bh(&smc_lgr_list.lock);
 	list_add(&lgr->list, &smc_lgr_list.list);
 	spin_unlock_bh(&smc_lgr_list.lock);
+	return 0;
+
+free_lgr:
+	kfree(lgr);
 out:
 	return rc;
 }
@@ -202,6 +211,8 @@ void smc_conn_free(struct smc_connection *conn)
 static void smc_link_clear(struct smc_link *lnk)
 {
 	lnk->peer_qpn = 0;
+	smc_wr_free_link(lnk);
+	smc_wr_free_link_mem(lnk);
 }
 
 static void smc_lgr_free_sndbufs(struct smc_link_group *lgr)

net/smc/smc_core.h

@@ -11,6 +11,7 @@
 #ifndef _SMC_CORE_H
 #define _SMC_CORE_H
 
+#include <linux/atomic.h>
 #include <rdma/ib_verbs.h>
 
 #include "smc.h"
@@ -30,11 +31,40 @@ enum smc_lgr_role {		/* possible roles of a link group */
 	SMC_SERV	/* server */
 };
 
+#define SMC_WR_BUF_SIZE		48	/* size of work request buffer */
+
+struct smc_wr_buf {
+	u8	raw[SMC_WR_BUF_SIZE];
+};
+
 struct smc_link {
 	struct smc_ib_device	*smcibdev;	/* ib-device */
 	u8			ibport;		/* port - values 1 | 2 */
+	struct ib_pd		*roce_pd;	/* IB protection domain,
+						 * unique for every RoCE QP
+						 */
 	struct ib_qp		*roce_qp;	/* IB queue pair */
 	struct ib_qp_attr	qp_attr;	/* IB queue pair attributes */
+
+	struct smc_wr_buf	*wr_tx_bufs;	/* WR send payload buffers */
+	struct ib_send_wr	*wr_tx_ibs;	/* WR send meta data */
+	struct ib_sge		*wr_tx_sges;	/* WR send gather meta data */
+	struct smc_wr_tx_pend	*wr_tx_pends;	/* WR send waiting for CQE */
+	/* above four vectors have wr_tx_cnt elements and use the same index */
+	dma_addr_t		wr_tx_dma_addr;	/* DMA address of wr_tx_bufs */
+	atomic_long_t		wr_tx_id;	/* seq # of last sent WR */
+	unsigned long		*wr_tx_mask;	/* bit mask of used indexes */
+	u32			wr_tx_cnt;	/* number of WR send buffers */
+	wait_queue_head_t	wr_tx_wait;	/* wait for free WR send buf */
+
+	struct smc_wr_buf	*wr_rx_bufs;	/* WR recv payload buffers */
+	struct ib_recv_wr	*wr_rx_ibs;	/* WR recv meta data */
+	struct ib_sge		*wr_rx_sges;	/* WR recv scatter meta data */
+	/* above three vectors have wr_rx_cnt elements and use the same index */
+	dma_addr_t		wr_rx_dma_addr;	/* DMA address of wr_rx_bufs */
+	u64			wr_rx_id;	/* seq # of last recv WR */
+	u32			wr_rx_cnt;	/* number of WR recv buffers */
+
 	union ib_gid		gid;		/* gid matching used vlan id */
 	u32			peer_qpn;	/* QP number of peer */
 	enum ib_mtu		path_mtu;	/* used mtu */

net/smc/smc_ib.c

@@ -17,6 +17,7 @@
 #include "smc_pnet.h"
 #include "smc_ib.h"
 #include "smc_core.h"
+#include "smc_wr.h"
 #include "smc.h"
 
 struct smc_ib_devices smc_ib_devices = {	/* smc-registered ib devices */
@@ -30,6 +31,78 @@ u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET;	/* unique system
 								 * identifier
 								 */
 
+void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
+{
+	ib_dealloc_pd(lnk->roce_pd);
+	lnk->roce_pd = NULL;
+}
+
+int smc_ib_create_protection_domain(struct smc_link *lnk)
+{
+	int rc;
+
+	lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
+	rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
+	if (IS_ERR(lnk->roce_pd))
+		lnk->roce_pd = NULL;
+	return rc;
+}
+
+static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
+{
+	switch (ibevent->event) {
+	case IB_EVENT_DEVICE_FATAL:
+	case IB_EVENT_GID_CHANGE:
+	case IB_EVENT_PORT_ERR:
+	case IB_EVENT_QP_ACCESS_ERR:
+		/* tbd in follow-on patch:
+		 * abnormal close of corresponding connections
+		 */
+		break;
+	default:
+		break;
+	}
+}
+
+void smc_ib_destroy_queue_pair(struct smc_link *lnk)
+{
+	ib_destroy_qp(lnk->roce_qp);
+	lnk->roce_qp = NULL;
+}
+
+/* create a queue pair within the protection domain for a link */
+int smc_ib_create_queue_pair(struct smc_link *lnk)
+{
+	struct ib_qp_init_attr qp_attr = {
+		.event_handler = smc_ib_qp_event_handler,
+		.qp_context = lnk,
+		.send_cq = lnk->smcibdev->roce_cq_send,
+		.recv_cq = lnk->smcibdev->roce_cq_recv,
+		.srq = NULL,
+		.cap = {
+			.max_send_wr = SMC_WR_BUF_CNT,
+				/* include unsolicited rdma_writes as well,
+				 * there are max. 2 RDMA_WRITE per 1 WR_SEND
+				 */
+			.max_recv_wr = SMC_WR_BUF_CNT * 3,
+			.max_send_sge = SMC_IB_MAX_SEND_SGE,
+			.max_recv_sge = 1,
+			.max_inline_data = SMC_WR_TX_SIZE,
+		},
+		.sq_sig_type = IB_SIGNAL_REQ_WR,
+		.qp_type = IB_QPT_RC,
+	};
+	int rc;
+
+	lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
+	rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
+	if (IS_ERR(lnk->roce_qp))
+		lnk->roce_qp = NULL;
+	else
+		smc_wr_remember_qp_attr(lnk);
+	return rc;
+}
+
 /* map a new TX or RX buffer to DMA */
 int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size,
 		   struct smc_buf_desc *buf_slot,

net/smc/smc_ib.h

@@ -16,6 +16,8 @@
 #define SMC_MAX_PORTS			2	/* Max # of ports */
 #define SMC_GID_SIZE			sizeof(union ib_gid)
 
+#define SMC_IB_MAX_SEND_SGE		2
+
 struct smc_ib_devices {			/* list of smc ib devices definition */
 	struct list_head	list;
 	spinlock_t		lock;	/* protects list of smc ib devices */
@@ -27,12 +29,17 @@ struct smc_ib_device {				/* ib-device infos for smc */
 	struct list_head	list;
 	struct ib_device	*ibdev;
 	struct ib_port_attr	pattr[SMC_MAX_PORTS];	/* ib dev. port attrs */
+	struct ib_cq		*roce_cq_send;	/* send completion queue */
+	struct ib_cq		*roce_cq_recv;	/* recv completion queue */
+	struct tasklet_struct	send_tasklet;	/* called by send cq handler */
+	struct tasklet_struct	recv_tasklet;	/* called by recv cq handler */
 	char			mac[SMC_MAX_PORTS][6]; /* mac address per port*/
 	union ib_gid		gid[SMC_MAX_PORTS]; /* gid per port */
 	u8			initialized : 1; /* ib dev CQ, evthdl done */
 };
 
 struct smc_buf_desc;
+struct smc_link;
 
 int smc_ib_register_client(void) __init;
 void smc_ib_unregister_client(void);
@@ -41,5 +48,9 @@ int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport);
 int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size,
 		   struct smc_buf_desc *buf_slot,
 		   enum dma_data_direction data_direction);
+void smc_ib_dealloc_protection_domain(struct smc_link *lnk);
+int smc_ib_create_protection_domain(struct smc_link *lnk);
+void smc_ib_destroy_queue_pair(struct smc_link *lnk);
+int smc_ib_create_queue_pair(struct smc_link *lnk);
 
 #endif