[ofa-general] [PATCH 13/21] RDS/IB: Infiniband transport
Andy Grover
andy.grover at oracle.com
Mon Jan 26 18:17:50 PST 2009
Registers as an RDS transport and an IB client, and uses IB CM
API to allocate ids, queue pairs, and the rest of that fun stuff.
Signed-off-by: Andy Grover <andy.grover at oracle.com>
---
drivers/infiniband/ulp/rds/ib.c | 312 +++++++++++++
drivers/infiniband/ulp/rds/ib.h | 358 +++++++++++++++
drivers/infiniband/ulp/rds/ib_cm.c | 882 ++++++++++++++++++++++++++++++++++++
3 files changed, 1552 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/ulp/rds/ib.c
create mode 100644 drivers/infiniband/ulp/rds/ib.h
create mode 100644 drivers/infiniband/ulp/rds/ib_cm.c
diff --git a/drivers/infiniband/ulp/rds/ib.c b/drivers/infiniband/ulp/rds/ib.c
new file mode 100644
index 0000000..cd35fba
--- /dev/null
+++ b/drivers/infiniband/ulp/rds/ib.c
@@ -0,0 +1,312 @@
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/if_arp.h>
+#include <linux/delay.h>
+
+#include "rds.h"
+#include "ib.h"
+
+unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
+unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
+
+module_param(fmr_pool_size, int, 0444);
+MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
+module_param(fmr_message_size, int, 0444);
+MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
+
+struct list_head rds_ib_devices;
+
+DEFINE_SPINLOCK(ib_nodev_conns_lock);
+LIST_HEAD(ib_nodev_conns);
+
+void rds_ib_add_one(struct ib_device *device)
+{
+ struct rds_ib_device *rds_ibdev;
+ struct ib_device_attr *dev_attr;
+
+ /* Only handle IB (no iWARP) devices */
+ if (device->node_type != RDMA_NODE_IB_CA)
+ return;
+
+ dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
+ if (!dev_attr)
+ return;
+
+ if (ib_query_device(device, dev_attr)) {
+ rdsdebug("Query device failed for %s\n", device->name);
+ goto free_attr;
+ }
+
+ rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
+ if (!rds_ibdev)
+ goto free_attr;
+
+ spin_lock_init(&rds_ibdev->spinlock);
+
+ rds_ibdev->max_wrs = dev_attr->max_qp_wr;
+ rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
+
+ rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
+ rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift;
+ rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1);
+ rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
+ rds_ibdev->max_fmrs = dev_attr->max_fmr ?
+ min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
+ fmr_pool_size;
+
+ rds_ibdev->dev = device;
+ rds_ibdev->pd = ib_alloc_pd(device);
+ if (IS_ERR(rds_ibdev->pd))
+ goto free_dev;
+
+ rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
+ IB_ACCESS_LOCAL_WRITE);
+ if (IS_ERR(rds_ibdev->mr))
+ goto err_pd;
+
+ rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
+ if (IS_ERR(rds_ibdev->mr_pool)) {
+ rds_ibdev->mr_pool = NULL;
+ goto err_mr;
+ }
+
+ INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
+ INIT_LIST_HEAD(&rds_ibdev->conn_list);
+ list_add_tail(&rds_ibdev->list, &rds_ib_devices);
+
+ ib_set_client_data(device, &rds_ib_client, rds_ibdev);
+
+ goto free_attr;
+
+err_mr:
+ ib_dereg_mr(rds_ibdev->mr);
+err_pd:
+ ib_dealloc_pd(rds_ibdev->pd);
+free_dev:
+ kfree(rds_ibdev);
+free_attr:
+ kfree(dev_attr);
+}
+
+void rds_ib_remove_one(struct ib_device *device)
+{
+ struct rds_ib_device *rds_ibdev;
+ struct rds_ib_ipaddr *i_ipaddr, *i_next;
+
+ rds_ibdev = ib_get_client_data(device, &rds_ib_client);
+ if (!rds_ibdev)
+ return;
+
+ list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
+ list_del(&i_ipaddr->list);
+ kfree(i_ipaddr);
+ }
+
+ rds_ib_remove_conns(rds_ibdev);
+
+ if (rds_ibdev->mr_pool)
+ rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
+
+ ib_dereg_mr(rds_ibdev->mr);
+
+ while (ib_dealloc_pd(rds_ibdev->pd)) {
+ rdsdebug("%s-%d Failed to dealloc pd %p\n", __func__, __LINE__, rds_ibdev->pd);
+ msleep(1);
+ }
+
+ list_del(&rds_ibdev->list);
+ kfree(rds_ibdev);
+}
+
+struct ib_client rds_ib_client = {
+ .name = "rds_ib",
+ .add = rds_ib_add_one,
+ .remove = rds_ib_remove_one
+};
+
+static int rds_ib_conn_info_visitor(struct rds_connection *conn,
+ void *buffer)
+{
+ struct rds_info_rdma_connection *iinfo = buffer;
+ struct rds_ib_connection *ic;
+
+ /* We will only ever look at IB transports */
+ if (conn->c_trans != &rds_ib_transport)
+ return 0;
+
+ iinfo->src_addr = conn->c_laddr;
+ iinfo->dst_addr = conn->c_faddr;
+
+ memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
+ memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
+ if (rds_conn_state(conn) == RDS_CONN_UP) {
+ struct rds_ib_device *rds_ibdev;
+ struct rdma_dev_addr *dev_addr;
+
+ ic = conn->c_transport_data;
+ dev_addr = &ic->i_cm_id->route.addr.dev_addr;
+
+ ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
+ ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
+
+ rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
+ iinfo->max_send_wr = ic->i_send_ring.w_nr;
+ iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
+ iinfo->max_send_sge = rds_ibdev->max_sge;
+ rds_ib_get_mr_info(rds_ibdev, iinfo);
+ }
+ return 1;
+}
+
+static void rds_ib_ic_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ rds_for_each_conn_info(sock, len, iter, lens,
+ rds_ib_conn_info_visitor,
+ sizeof(struct rds_info_rdma_connection));
+}
+
+
+/*
+ * Early RDS/IB was built to only bind to an address if there is an IPoIB
+ * device with that address set.
+ *
+ * If it were me, I'd advocate for something more flexible. Sending and
+ * receiving should be device-agnostic. Transports would try and maintain
+ * connections between peers who have messages queued. Userspace would be
+ * allowed to influence which paths have priority. We could call userspace
+ * asserting this policy "routing".
+ */
+static int rds_ib_laddr_check(__be32 addr)
+{
+ struct net_device *dev;
+ int ret;
+
+ dev = ip_dev_find(&init_net, addr);
+ if (dev && dev->type == ARPHRD_INFINIBAND) {
+ dev_put(dev);
+ ret = 0;
+ } else
+ ret = -EADDRNOTAVAIL;
+
+ rdsdebug("addr %u.%u.%u.%u ret %d\n", NIPQUAD(addr), ret);
+
+ return ret;
+}
+
+void rds_ib_exit(void)
+{
+ rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
+ rds_ib_listen_stop();
+ rds_ib_remove_nodev_conns();
+ ib_unregister_client(&rds_ib_client);
+ rds_ib_sysctl_exit();
+ rds_ib_recv_exit();
+ rds_trans_unregister(&rds_ib_transport);
+}
+
+struct rds_transport rds_ib_transport = {
+ .laddr_check = rds_ib_laddr_check,
+ .xmit_complete = rds_ib_xmit_complete,
+ .xmit = rds_ib_xmit,
+ .xmit_cong_map = NULL,
+ .xmit_rdma = rds_ib_xmit_rdma,
+ .recv = rds_ib_recv,
+ .conn_alloc = rds_ib_conn_alloc,
+ .conn_free = rds_ib_conn_free,
+ .conn_connect = rds_ib_conn_connect,
+ .conn_shutdown = rds_ib_conn_shutdown,
+ .inc_copy_to_user = rds_ib_inc_copy_to_user,
+ .inc_purge = rds_ib_inc_purge,
+ .inc_free = rds_ib_inc_free,
+ .listen_stop = rds_ib_listen_stop,
+ .stats_info_copy = rds_ib_stats_info_copy,
+ .exit = rds_ib_exit,
+ .get_mr = rds_ib_get_mr,
+ .sync_mr = rds_ib_sync_mr,
+ .free_mr = rds_ib_free_mr,
+ .flush_mrs = rds_ib_flush_mrs,
+ .t_owner = THIS_MODULE,
+ .t_name = "infiniband",
+};
+
+int __init rds_ib_init(void)
+{
+ int ret;
+
+ INIT_LIST_HEAD(&rds_ib_devices);
+
+ ret = ib_register_client(&rds_ib_client);
+ if (ret)
+ goto out;
+
+ ret = rds_ib_sysctl_init();
+ if (ret)
+ goto out_ibreg;
+
+ ret = rds_ib_recv_init();
+ if (ret)
+ goto out_sysctl;
+
+ ret = rds_trans_register(&rds_ib_transport);
+ if (ret)
+ goto out_recv;
+
+ ret = rds_ib_listen_init();
+ if (ret)
+ goto out_register;
+
+ rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
+
+ goto out;
+
+out_register:
+ rds_trans_unregister(&rds_ib_transport);
+out_recv:
+ rds_ib_recv_exit();
+out_sysctl:
+ rds_ib_sysctl_exit();
+out_ibreg:
+ ib_unregister_client(&rds_ib_client);
+out:
+ return ret;
+}
+
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/infiniband/ulp/rds/ib.h b/drivers/infiniband/ulp/rds/ib.h
new file mode 100644
index 0000000..eff70f0
--- /dev/null
+++ b/drivers/infiniband/ulp/rds/ib.h
@@ -0,0 +1,358 @@
+#ifndef _RDS_IB_H
+#define _RDS_IB_H
+
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include "rds.h"
+
+#define RDS_IB_RESOLVE_TIMEOUT_MS 5000
+
+#define RDS_FMR_SIZE 256
+#define RDS_FMR_POOL_SIZE 4096
+
+#define RDS_IB_MAX_SGE 8
+#define RDS_IB_RECV_SGE 2
+
+#define RDS_IB_DEFAULT_RECV_WR 1024
+#define RDS_IB_DEFAULT_SEND_WR 256
+
+#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
+
+extern struct list_head rds_ib_devices;
+
+/*
+ * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
+ * try and minimize the amount of memory tied up both the device and
+ * socket receive queues.
+ */
+/* page offset of the final full frag that fits in the page */
+#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
+struct rds_page_frag {
+ struct list_head f_item;
+ struct page *f_page;
+ unsigned long f_offset;
+ dma_addr_t f_mapped;
+};
+
+struct rds_ib_incoming {
+ struct list_head ii_frags;
+ struct rds_incoming ii_inc;
+};
+
+struct rds_ib_connect_private {
+ /* Add new fields at the end, and don't permute existing fields. */
+ __be32 dp_saddr;
+ __be32 dp_daddr;
+ u8 dp_protocol_major;
+ u8 dp_protocol_minor;
+ __be16 dp_protocol_minor_mask; /* bitmask */
+ __be32 dp_reserved1;
+ __be64 dp_ack_seq;
+ __be32 dp_credit; /* non-zero enables flow ctl */
+};
+
+struct rds_ib_send_work {
+ struct rds_message *s_rm;
+ struct rds_rdma_op *s_op;
+ struct ib_send_wr s_wr;
+ struct ib_sge s_sge[RDS_IB_MAX_SGE];
+ unsigned long s_queued;
+};
+
+struct rds_ib_recv_work {
+ struct rds_ib_incoming *r_ibinc;
+ struct rds_page_frag *r_frag;
+ struct ib_recv_wr r_wr;
+ struct ib_sge r_sge[2];
+};
+
+struct rds_ib_work_ring {
+ u32 w_nr;
+ u32 w_alloc_ptr;
+ u32 w_alloc_ctr;
+ u32 w_free_ptr;
+ atomic_t w_free_ctr;
+};
+
+struct rds_ib_device;
+
+struct rds_ib_connection {
+
+ struct list_head ib_node;
+ struct rds_ib_device *rds_ibdev;
+ struct rds_connection *conn;
+
+ /* alphabet soup, IBTA style */
+ struct rdma_cm_id *i_cm_id;
+ struct ib_pd *i_pd;
+ struct ib_mr *i_mr;
+ struct ib_cq *i_send_cq;
+ struct ib_cq *i_recv_cq;
+
+ /* tx */
+ struct rds_ib_work_ring i_send_ring;
+ struct rds_message *i_rm;
+ struct rds_header *i_send_hdrs;
+ u64 i_send_hdrs_dma;
+ struct rds_ib_send_work *i_sends;
+
+ /* rx */
+ struct mutex i_recv_mutex;
+ struct rds_ib_work_ring i_recv_ring;
+ struct rds_ib_incoming *i_ibinc;
+ u32 i_recv_data_rem;
+ struct rds_header *i_recv_hdrs;
+ u64 i_recv_hdrs_dma;
+ struct rds_ib_recv_work *i_recvs;
+ struct rds_page_frag i_frag;
+ u64 i_ack_recv; /* last ACK received */
+
+ /* sending acks */
+ unsigned long i_ack_flags;
+#ifndef KERNEL_HAS_ATOMIC64
+ spinlock_t i_ack_lock; /* protect i_ack_next */
+ u64 i_ack_next; /* next ACK to send */
+#else
+ atomic64_t i_ack_next; /* next ACK to send */
+#endif
+ struct rds_header *i_ack;
+ struct ib_send_wr i_ack_wr;
+ struct ib_sge i_ack_sge;
+ u64 i_ack_dma;
+ unsigned long i_ack_queued;
+
+ /* Flow control related information
+ *
+ * Our algorithm uses a pair variables that we need to access
+ * atomically - one for the send credits, and one posted
+ * recv credits we need to transfer to remote.
+ * Rather than protect them using a slow spinlock, we put both into
+ * a single atomic_t and update it using cmpxchg
+ */
+ atomic_t i_credits;
+
+ /* Protocol version specific information */
+ unsigned int i_flowctl:1; /* enable/disable flow ctl */
+
+ /* Batched completions */
+ unsigned int i_unsignaled_wrs;
+ long i_unsignaled_bytes;
+};
+
+/* This assumes that atomic_t is at least 32 bits */
+#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
+#define IB_GET_POST_CREDITS(v) ((v) >> 16)
+#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
+#define IB_SET_POST_CREDITS(v) ((v) << 16)
+
+struct rds_ib_ipaddr {
+ struct list_head list;
+ __be32 ipaddr;
+};
+
+struct rds_ib_device {
+ struct list_head list;
+ struct list_head ipaddr_list;
+ struct list_head conn_list;
+ struct ib_device *dev;
+ struct ib_pd *pd;
+ struct ib_mr *mr;
+ struct rds_ib_mr_pool *mr_pool;
+ int fmr_page_shift;
+ int fmr_page_size;
+ u64 fmr_page_mask;
+ unsigned int fmr_max_remaps;
+ unsigned int max_fmrs;
+ int max_sge;
+ unsigned int max_wrs;
+ spinlock_t spinlock; /* protect the above */
+};
+
+/* bits for i_ack_flags */
+#define IB_ACK_IN_FLIGHT 0
+#define IB_ACK_REQUESTED 1
+
+/* Magic WR_ID for ACKs */
+#define RDS_IB_ACK_WR_ID (~(u64) 0)
+
+struct rds_ib_statistics {
+ uint64_t s_ib_connect_raced;
+ uint64_t s_ib_listen_closed_stale;
+ uint64_t s_ib_tx_cq_call;
+ uint64_t s_ib_tx_cq_event;
+ uint64_t s_ib_tx_ring_full;
+ uint64_t s_ib_tx_throttle;
+ uint64_t s_ib_tx_sg_mapping_failure;
+ uint64_t s_ib_tx_stalled;
+ uint64_t s_ib_tx_credit_updates;
+ uint64_t s_ib_rx_cq_call;
+ uint64_t s_ib_rx_cq_event;
+ uint64_t s_ib_rx_ring_empty;
+ uint64_t s_ib_rx_refill_from_cq;
+ uint64_t s_ib_rx_refill_from_thread;
+ uint64_t s_ib_rx_alloc_limit;
+ uint64_t s_ib_rx_credit_updates;
+ uint64_t s_ib_ack_sent;
+ uint64_t s_ib_ack_send_failure;
+ uint64_t s_ib_ack_send_delayed;
+ uint64_t s_ib_ack_send_piggybacked;
+ uint64_t s_ib_ack_received;
+ uint64_t s_ib_rdma_mr_alloc;
+ uint64_t s_ib_rdma_mr_free;
+ uint64_t s_ib_rdma_mr_used;
+ uint64_t s_ib_rdma_mr_pool_flush;
+ uint64_t s_ib_rdma_mr_pool_wait;
+ uint64_t s_ib_rdma_mr_pool_depleted;
+};
+
+extern struct workqueue_struct *rds_ib_wq;
+
+/*
+ * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
+ * doesn't define it.
+ */
+static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
+ struct scatterlist *sg, unsigned int sg_dma_len, int direction)
+{
+ unsigned int i;
+
+ for (i = 0; i < sg_dma_len; ++i) {
+ ib_dma_sync_single_for_cpu(dev,
+ ib_sg_dma_address(dev, &sg[i]),
+ ib_sg_dma_len(dev, &sg[i]),
+ direction);
+ }
+}
+#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
+
+static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
+ struct scatterlist *sg, unsigned int sg_dma_len, int direction)
+{
+ unsigned int i;
+
+ for (i = 0; i < sg_dma_len; ++i) {
+ ib_dma_sync_single_for_device(dev,
+ ib_sg_dma_address(dev, &sg[i]),
+ ib_sg_dma_len(dev, &sg[i]),
+ direction);
+ }
+}
+#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
+
+
+/* ib.c */
+extern struct rds_transport rds_ib_transport;
+extern void rds_ib_add_one(struct ib_device *device);
+extern void rds_ib_remove_one(struct ib_device *device);
+extern struct ib_client rds_ib_client;
+
+extern unsigned int fmr_pool_size;
+extern unsigned int fmr_message_size;
+
+extern spinlock_t ib_nodev_conns_lock;
+extern struct list_head ib_nodev_conns;
+
+/* ib_cm.c */
+int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
+void rds_ib_conn_free(void *arg);
+int rds_ib_conn_connect(struct rds_connection *conn);
+void rds_ib_conn_shutdown(struct rds_connection *conn);
+void rds_ib_state_change(struct sock *sk);
+int __init rds_ib_listen_init(void);
+void rds_ib_listen_stop(void);
+void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
+
+#define rds_ib_conn_error(conn, fmt...) \
+ __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
+
+/* ib_rdma.c */
+int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
+int rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
+void rds_ib_remove_nodev_conns(void);
+void rds_ib_remove_conns(struct rds_ib_device *rds_ibdev);
+struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
+void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
+void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
+void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
+ struct rds_sock *rs, u32 *key_ret);
+void rds_ib_sync_mr(void *trans_private, int dir);
+void rds_ib_free_mr(void *trans_private, int invalidate);
+void rds_ib_flush_mrs(void);
+
+/* ib_recv.c */
+int __init rds_ib_recv_init(void);
+void rds_ib_recv_exit(void);
+int rds_ib_recv(struct rds_connection *conn);
+int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
+ gfp_t page_gfp, int prefill);
+void rds_ib_inc_purge(struct rds_incoming *inc);
+void rds_ib_inc_free(struct rds_incoming *inc);
+int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
+ size_t size);
+void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
+void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
+void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
+void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
+void rds_ib_attempt_ack(struct rds_ib_connection *ic);
+void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
+u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
+
+/* ib_ring.c */
+void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
+void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
+u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
+void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
+void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
+int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
+int rds_ib_ring_low(struct rds_ib_work_ring *ring);
+u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
+u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
+extern wait_queue_head_t rds_ib_ring_empty_wait;
+
+/* ib_send.c */
+void rds_ib_xmit_complete(struct rds_connection *conn);
+int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
+ unsigned int hdr_off, unsigned int sg, unsigned int off);
+void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
+void rds_ib_send_init_ring(struct rds_ib_connection *ic);
+void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
+int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
+void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
+void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
+int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
+ u32 *adv_credits);
+
+/* ib_stats.c */
+DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
+#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
+unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
+ unsigned int avail);
+
+/* ib_sysctl.c */
+int __init rds_ib_sysctl_init(void);
+void rds_ib_sysctl_exit(void);
+extern unsigned long rds_ib_sysctl_max_send_wr;
+extern unsigned long rds_ib_sysctl_max_recv_wr;
+extern unsigned long rds_ib_sysctl_max_unsig_wrs;
+extern unsigned long rds_ib_sysctl_max_unsig_bytes;
+extern unsigned long rds_ib_sysctl_max_recv_allocation;
+extern unsigned int rds_ib_sysctl_flow_control;
+extern ctl_table rds_ib_sysctl_table[];
+
+/*
+ * Helper functions for getting/setting the header and data SGEs in
+ * RDS packets (not RDMA)
+ */
+static inline struct ib_sge *
+rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
+{
+ return &sge[0];
+}
+
+static inline struct ib_sge *
+rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
+{
+ return &sge[1];
+}
+
+#endif
diff --git a/drivers/infiniband/ulp/rds/ib_cm.c b/drivers/infiniband/ulp/rds/ib_cm.c
new file mode 100644
index 0000000..870070d
--- /dev/null
+++ b/drivers/infiniband/ulp/rds/ib_cm.c
@@ -0,0 +1,882 @@
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <linux/vmalloc.h>
+
+#include "rds.h"
+#include "ib.h"
+
+static struct rdma_cm_id *rds_ib_listen_id;
+
+/*
+ * Set the selected protocol version
+ */
+static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
+{
+ conn->c_version = version;
+}
+
+/*
+ * Set up flow control
+ */
+static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
+{
+ struct rds_ib_connection *ic = conn->c_transport_data;
+
+ if (rds_ib_sysctl_flow_control && credits != 0) {
+ /* We're doing flow control */
+ ic->i_flowctl = 1;
+ rds_ib_send_add_credits(conn, credits);
+ } else {
+ ic->i_flowctl = 0;
+ }
+}
+
+/*
+ * Tune RNR behavior. Without flow control, we use a rather
+ * low timeout, but not the absolute minimum - this should
+ * be tunable.
+ *
+ * We already set the RNR retry count to 7 (which is the
+ * smallest infinite number :-) above.
+ * If flow control is off, we want to change this back to 0
+ * so that we learn quickly when our credit accounting is
+ * buggy.
+ *
+ * Caller passes in a qp_attr pointer - don't waste stack spacv
+ * by allocation this twice.
+ */
+static void
+rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
+{
+ int ret;
+
+ if (ic->i_flowctl) {
+ /* It seems we have to take a brief detour through SQD state
+ * in order to change the RNR retry count. */
+ attr->qp_state = IB_QPS_SQD;
+ ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_STATE);
+ if (ret)
+ printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, SQD): err=%d\n", -ret);
+
+ attr->rnr_retry = 0;
+ ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_RNR_RETRY);
+ if (ret)
+ printk(KERN_NOTICE "ib_modify_qp(IB_QP_RNR_RETRY, 0): err=%d\n", -ret);
+ } else {
+ attr->min_rnr_timer = IB_RNR_TIMER_000_32;
+ ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
+ if (ret)
+ printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
+ }
+}
+
+/*
+ * Connection established.
+ * We get here for both outgoing and incoming connection.
+ */
+static void rds_ib_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
+{
+ const struct rds_ib_connect_private *dp = NULL;
+ struct rds_ib_connection *ic = conn->c_transport_data;
+ struct rds_ib_device *rds_ibdev;
+ struct ib_qp_attr qp_attr;
+ int err;
+
+ if (event->param.conn.private_data_len) {
+ dp = event->param.conn.private_data;
+
+ rds_ib_set_protocol(conn,
+ RDS_PROTOCOL(dp->dp_protocol_major,
+ dp->dp_protocol_minor));
+ rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
+ }
+
+ printk(KERN_NOTICE "RDS/IB: connected to %u.%u.%u.%u version %u.%u%s\n",
+ NIPQUAD(conn->c_laddr),
+ RDS_PROTOCOL_MAJOR(conn->c_version),
+ RDS_PROTOCOL_MINOR(conn->c_version),
+ ic->i_flowctl ? ", flow control" : "");
+
+ /* Tune RNR behavior */
+ rds_ib_tune_rnr(ic, &qp_attr);
+
+ qp_attr.qp_state = IB_QPS_RTS;
+ err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
+ if (err)
+ printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
+
+ /* update ib_device with this local ipaddr & conn */
+ rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
+ err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr);
+ if (err)
+ printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err);
+ err = rds_ib_add_conn(rds_ibdev, conn);
+ if (err)
+ printk(KERN_ERR "rds_ib_add_conn failed (%d)\n", err);
+
+ /* If the peer gave us the last packet it saw, process this as if
+ * we had received a regular ACK. */
+ if (dp && dp->dp_ack_seq)
+ rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
+
+ rds_connect_complete(conn);
+}
+
+static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
+ struct rdma_conn_param *conn_param,
+ struct rds_ib_connect_private *dp,
+ u32 protocol_version)
+{
+ memset(conn_param, 0, sizeof(struct rdma_conn_param));
+ /* XXX tune these? */
+ conn_param->responder_resources = 1;
+ conn_param->initiator_depth = 1;
+ conn_param->retry_count = 7;
+ conn_param->rnr_retry_count = 7;
+
+ if (dp) {
+ struct rds_ib_connection *ic = conn->c_transport_data;
+
+ memset(dp, 0, sizeof(*dp));
+ dp->dp_saddr = conn->c_laddr;
+ dp->dp_daddr = conn->c_faddr;
+ dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
+ dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
+ dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
+ dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
+
+ /* Advertise flow control */
+ if (ic->i_flowctl) {
+ unsigned int credits;
+
+ credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
+ dp->dp_credit = cpu_to_be32(credits);
+ atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
+ }
+
+ conn_param->private_data = dp;
+ conn_param->private_data_len = sizeof(*dp);
+ }
+}
+
+static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
+{
+ rdsdebug("event %u data %p\n", event->event, data);
+}
+
+static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
+{
+ struct rds_connection *conn = data;
+ struct rds_ib_connection *ic = conn->c_transport_data;
+
+ rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
+
+ switch (event->event) {
+ case IB_EVENT_COMM_EST:
+ rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
+ break;
+ default:
+ printk(KERN_WARNING "RDS/ib: unhandled QP event %u "
+ "on connection to %u.%u.%u.%u\n", event->event,
+ NIPQUAD(conn->c_faddr));
+ break;
+ }
+}
+
+/*
+ * This needs to be very careful to not leave IS_ERR pointers around for
+ * cleanup to trip over.
+ */
+static int rds_ib_setup_qp(struct rds_connection *conn)
+{
+ struct rds_ib_connection *ic = conn->c_transport_data;
+ struct ib_device *dev = ic->i_cm_id->device;
+ struct ib_qp_init_attr attr;
+ struct rds_ib_device *rds_ibdev;
+ int ret;
+
+ /* rds_ib_add_one creates a rds_ib_device object per IB device,
+ * and allocates a protection domain, memory range and FMR pool
+ * for each. If that fails for any reason, it will not register
+ * the rds_ibdev at all.
+ */
+ rds_ibdev = ib_get_client_data(dev, &rds_ib_client);
+ if (rds_ibdev == NULL) {
+ if (printk_ratelimit())
+ printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n",
+ dev->name);
+ return -EOPNOTSUPP;
+ }
+
+ if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
+ rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
+ if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
+ rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
+
+ /* Protection domain and memory range */
+ ic->i_pd = rds_ibdev->pd;
+ ic->i_mr = rds_ibdev->mr;
+
+ ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
+ rds_ib_cq_event_handler, conn,
+ ic->i_send_ring.w_nr + 1, 0);
+ if (IS_ERR(ic->i_send_cq)) {
+ ret = PTR_ERR(ic->i_send_cq);
+ ic->i_send_cq = NULL;
+ rdsdebug("ib_create_cq send failed: %d\n", ret);
+ goto out;
+ }
+
+ ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
+ rds_ib_cq_event_handler, conn,
+ ic->i_recv_ring.w_nr, 0);
+ if (IS_ERR(ic->i_recv_cq)) {
+ ret = PTR_ERR(ic->i_recv_cq);
+ ic->i_recv_cq = NULL;
+ rdsdebug("ib_create_cq recv failed: %d\n", ret);
+ goto out;
+ }
+
+ ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
+ if (ret) {
+ rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
+ goto out;
+ }
+
+ ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
+ if (ret) {
+ rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
+ goto out;
+ }
+
+ /* XXX negotiate max send/recv with remote? */
+ memset(&attr, 0, sizeof(attr));
+ attr.event_handler = rds_ib_qp_event_handler;
+ attr.qp_context = conn;
+ /* + 1 to allow for the single ack message */
+ attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
+ attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
+ attr.cap.max_send_sge = rds_ibdev->max_sge;
+ attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
+ attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ attr.qp_type = IB_QPT_RC;
+ attr.send_cq = ic->i_send_cq;
+ attr.recv_cq = ic->i_recv_cq;
+
+ /*
+ * XXX this can fail if max_*_wr is too large? Are we supposed
+ * to back off until we get a value that the hardware can support?
+ */
+ ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
+ if (ret) {
+ rdsdebug("rdma_create_qp failed: %d\n", ret);
+ goto out;
+ }
+
+ ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
+ ic->i_send_ring.w_nr *
+ sizeof(struct rds_header),
+ &ic->i_send_hdrs_dma, GFP_KERNEL);
+ if (ic->i_send_hdrs == NULL) {
+ ret = -ENOMEM;
+ rdsdebug("ib_dma_alloc_coherent send failed\n");
+ goto out;
+ }
+
+ ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
+ ic->i_recv_ring.w_nr *
+ sizeof(struct rds_header),
+ &ic->i_recv_hdrs_dma, GFP_KERNEL);
+ if (ic->i_recv_hdrs == NULL) {
+ ret = -ENOMEM;
+ rdsdebug("ib_dma_alloc_coherent recv failed\n");
+ goto out;
+ }
+
+ ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
+ &ic->i_ack_dma, GFP_KERNEL);
+ if (ic->i_ack == NULL) {
+ ret = -ENOMEM;
+ rdsdebug("ib_dma_alloc_coherent ack failed\n");
+ goto out;
+ }
+
+ ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
+ if (ic->i_sends == NULL) {
+ ret = -ENOMEM;
+ rdsdebug("send allocation failed\n");
+ goto out;
+ }
+ rds_ib_send_init_ring(ic);
+
+ ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
+ if (ic->i_recvs == NULL) {
+ ret = -ENOMEM;
+ rdsdebug("recv allocation failed\n");
+ goto out;
+ }
+
+ rds_ib_recv_init_ring(ic);
+ rds_ib_recv_init_ack(ic);
+
+ /* Post receive buffers - as a side effect, this will update
+ * the posted credit count. */
+ rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
+
+ rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
+ ic->i_send_cq, ic->i_recv_cq);
+
+out:
+ return ret;
+}
+
+static u32 rds_ib_protocol_compatible(const struct rds_ib_connect_private *dp)
+{
+ u16 common;
+ u32 version = 0;
+
+ /* rdma_cm private data is odd - when there is any private data in the
+ * request, we will be given a pretty large buffer without telling us the
+ * original size. The only way to tell the difference is by looking at
+ * the contents, which are initialized to zero.
+ * If the protocol version fields aren't set, this is a connection attempt
+ * from an older version. This could could be 3.0 or 2.0 - we can't tell.
+ * We really should have changed this for OFED 1.3 :-( */
+ if (dp->dp_protocol_major == 0)
+ return RDS_PROTOCOL_3_0;
+
+ common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
+ if (dp->dp_protocol_major == 3 && common) {
+ version = RDS_PROTOCOL_3_0;
+ while ((common >>= 1) != 0)
+ version++;
+ } else if (printk_ratelimit()) {
+ printk(KERN_NOTICE "RDS: Connection from %u.%u.%u.%u using "
+ "incompatible protocol version %u.%u\n",
+ NIPQUAD(dp->dp_saddr),
+ dp->dp_protocol_major,
+ dp->dp_protocol_minor);
+ }
+ return version;
+}
+
+static int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
+ __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
+ const struct rds_ib_connect_private *dp = event->param.conn.private_data;
+ struct rds_ib_connect_private dp_rep;
+ struct rds_connection *conn = NULL;
+ struct rds_ib_connection *ic = NULL;
+ struct rdma_conn_param conn_param;
+ u32 version;
+ int err, destroy = 1;
+
+ /* Check whether the remote protocol version matches ours. */
+ version = rds_ib_protocol_compatible(dp);
+ if (!version)
+ goto out;
+
+ rdsdebug("saddr %u.%u.%u.%u daddr %u.%u.%u.%u RDSv%u.%u lguid 0x%llx fguid "
+ "0x%llx\n", NIPQUAD(dp->dp_saddr), NIPQUAD(dp->dp_daddr),
+ RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
+ (unsigned long long)be64_to_cpu(lguid),
+ (unsigned long long)be64_to_cpu(fguid));
+
+ conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
+ GFP_KERNEL);
+ if (IS_ERR(conn)) {
+ rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
+ conn = NULL;
+ goto out;
+ }
+ ic = conn->c_transport_data;
+
+ rds_ib_set_protocol(conn, version);
+ rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
+
+ /* If the peer gave us the last packet it saw, process this as if
+ * we had received a regular ACK. */
+ if (dp->dp_ack_seq)
+ rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
+
+ /*
+ * The connection request may occur while the
+ * previous connection exist, e.g. in case of failover.
+ * But as connections may be initiated simultaneously
+ * by both hosts, we have a random backoff mechanism -
+ * see the comment above rds_queue_reconnect()
+ */
+ if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
+ if (rds_conn_state(conn) == RDS_CONN_UP) {
+ rdsdebug("incoming connect while connecting\n");
+ rds_conn_drop(conn);
+ rds_ib_stats_inc(s_ib_listen_closed_stale);
+ } else
+ if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
+ /* Wait and see - our connect may still be succeeding */
+ rds_ib_stats_inc(s_ib_connect_raced);
+ }
+ goto out;
+ }
+
+ BUG_ON(cm_id->context);
+ BUG_ON(ic->i_cm_id);
+
+ ic->i_cm_id = cm_id;
+ cm_id->context = conn;
+
+ /* We got halfway through setting up the ib_connection, if we
+ * fail now, we have to take the long route out of this mess. */
+ destroy = 0;
+
+ err = rds_ib_setup_qp(conn);
+ if (err) {
+ rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
+ goto out;
+ }
+
+ rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
+
+ /* rdma_accept() calls rdma_reject() internally if it fails */
+ err = rdma_accept(cm_id, &conn_param);
+ if (err) {
+ rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
+ goto out;
+ }
+
+ return 0;
+
+out:
+ rdma_reject(cm_id, NULL, 0);
+ return destroy;
+}
+
+
+static int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
+{
+ struct rds_connection *conn = cm_id->context;
+ struct rds_ib_connection *ic = conn->c_transport_data;
+ struct rdma_conn_param conn_param;
+ struct rds_ib_connect_private dp;
+ int ret;
+
+ /* If the peer doesn't do protocol negotiation, we must
+ * default to RDSv3.0 */
+ rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
+ ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
+
+ ret = rds_ib_setup_qp(conn);
+ if (ret) {
+ rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
+ goto out;
+ }
+
+ rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
+
+ ret = rdma_connect(cm_id, &conn_param);
+ if (ret)
+ rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
+
+out:
+ /* Beware - returning non-zero tells the rdma_cm to destroy
+ * the cm_id. We should certainly not do it as long as we still
+ * "own" the cm_id. */
+ if (ret) {
+ if (ic->i_cm_id == cm_id)
+ ret = 0;
+ }
+ return ret;
+}
+
+static int rds_ib_cm_event_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ /* this can be null in the listening path */
+ struct rds_connection *conn = cm_id->context;
+ int ret = 0;
+
+ rdsdebug("conn %p id %p handling event %u\n", conn, cm_id,
+ event->event);
+
+ /* Prevent shutdown from tearing down the connection
+ * while we're executing. */
+ if (conn) {
+ mutex_lock(&conn->c_cm_lock);
+
+ /* If the connection is being shut down, bail out
+ * right away. We return 0 so cm_id doesn't get
+ * destroyed prematurely */
+ if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
+ /* Reject incoming connections while we're tearing
+ * down an existing one. */
+ if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
+ ret = 1;
+ goto out;
+ }
+ }
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ ret = rds_ib_cm_handle_connect(cm_id, event);
+ break;
+
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ /* XXX do we need to clean up if this fails? */
+ ret = rdma_resolve_route(cm_id,
+ RDS_IB_RESOLVE_TIMEOUT_MS);
+ break;
+
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ /* XXX worry about racing with listen acceptance */
+ ret = rds_ib_cm_initiate_connect(cm_id);
+ break;
+
+ case RDMA_CM_EVENT_ESTABLISHED:
+ rds_ib_connect_complete(conn, event);
+ break;
+
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ case RDMA_CM_EVENT_REJECTED:
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ if (conn)
+ rds_conn_drop(conn);
+ break;
+
+ case RDMA_CM_EVENT_DISCONNECTED:
+ rds_conn_drop(conn);
+ break;
+
+ default:
+ /* things like device disconnect? */
+ printk(KERN_ERR "unknown event %u\n", event->event);
+ BUG();
+ break;
+ }
+
+out:
+ if (conn) {
+ struct rds_ib_connection *ic = conn->c_transport_data;
+
+ /* If we return non-zero, we must to hang on to the cm_id */
+ BUG_ON(ic->i_cm_id == cm_id && ret);
+
+ mutex_unlock(&conn->c_cm_lock);
+ }
+
+ rdsdebug("id %p event %u handling ret %d\n", cm_id, event->event, ret);
+
+ return ret;
+}
+
+int rds_ib_conn_connect(struct rds_connection *conn)
+{
+ struct rds_ib_connection *ic = conn->c_transport_data;
+ struct sockaddr_in src, dest;
+ int ret;
+
+ /* XXX I wonder what affect the port space has */
+ ic->i_cm_id = rdma_create_id(rds_ib_cm_event_handler, conn,
+ RDMA_PS_TCP);
+ if (IS_ERR(ic->i_cm_id)) {
+ ret = PTR_ERR(ic->i_cm_id);
+ ic->i_cm_id = NULL;
+ rdsdebug("rdma_create_id() failed: %d\n", ret);
+ goto out;
+ }
+
+ rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
+
+ src.sin_family = AF_INET;
+ src.sin_addr.s_addr = (__force u32)conn->c_laddr;
+ src.sin_port = (__force u16)htons(0);
+
+ dest.sin_family = AF_INET;
+ dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
+ dest.sin_port = (__force u16)htons(RDS_PORT);
+
+ ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
+ (struct sockaddr *)&dest,
+ RDS_IB_RESOLVE_TIMEOUT_MS);
+ if (ret) {
+ rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
+ ret);
+ rdma_destroy_id(ic->i_cm_id);
+ ic->i_cm_id = NULL;
+ }
+
+out:
+ return ret;
+}
+
+/*
+ * This is so careful about only cleaning up resources that were built up
+ * so that it can be called at any point during startup. In fact it
+ * can be called multiple times for a given connection.
+ */
+void rds_ib_conn_shutdown(struct rds_connection *conn)
+{
+ struct rds_ib_connection *ic = conn->c_transport_data;
+ int err = 0;
+
+ rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
+ ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
+ ic->i_cm_id ? ic->i_cm_id->qp : NULL);
+
+ if (ic->i_cm_id) {
+ struct ib_device *dev = ic->i_cm_id->device;
+
+ rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
+ err = rdma_disconnect(ic->i_cm_id);
+ if (err) {
+ /* Actually this may happen quite frequently, when
+ * an outgoing connect raced with an incoming connect.
+ */
+ rdsdebug("failed to disconnect, cm: %p err %d\n",
+ ic->i_cm_id, err);
+ }
+
+ wait_event(rds_ib_ring_empty_wait,
+ rds_ib_ring_empty(&ic->i_send_ring) &&
+ rds_ib_ring_empty(&ic->i_recv_ring));
+
+ if (ic->i_send_hdrs)
+ ib_dma_free_coherent(dev,
+ ic->i_send_ring.w_nr *
+ sizeof(struct rds_header),
+ ic->i_send_hdrs,
+ ic->i_send_hdrs_dma);
+
+ if (ic->i_recv_hdrs)
+ ib_dma_free_coherent(dev,
+ ic->i_recv_ring.w_nr *
+ sizeof(struct rds_header),
+ ic->i_recv_hdrs,
+ ic->i_recv_hdrs_dma);
+
+ if (ic->i_ack)
+ ib_dma_free_coherent(dev, sizeof(struct rds_header),
+ ic->i_ack, ic->i_ack_dma);
+
+ if (ic->i_sends)
+ rds_ib_send_clear_ring(ic);
+ if (ic->i_recvs)
+ rds_ib_recv_clear_ring(ic);
+
+ if (ic->i_cm_id->qp)
+ rdma_destroy_qp(ic->i_cm_id);
+ if (ic->i_send_cq)
+ ib_destroy_cq(ic->i_send_cq);
+ if (ic->i_recv_cq)
+ ib_destroy_cq(ic->i_recv_cq);
+ rdma_destroy_id(ic->i_cm_id);
+
+ /*
+ * Move connection back to the nodev list.
+ */
+ if (ic->rds_ibdev) {
+
+ spin_lock_irq(&ic->rds_ibdev->spinlock);
+ BUG_ON(list_empty(&ic->ib_node));
+ list_del(&ic->ib_node);
+ spin_unlock_irq(&ic->rds_ibdev->spinlock);
+
+ spin_lock_irq(&ib_nodev_conns_lock);
+ list_add_tail(&ic->ib_node, &ib_nodev_conns);
+ spin_unlock_irq(&ib_nodev_conns_lock);
+ ic->rds_ibdev = NULL;
+ }
+
+ ic->i_cm_id = NULL;
+ ic->i_pd = NULL;
+ ic->i_mr = NULL;
+ ic->i_send_cq = NULL;
+ ic->i_recv_cq = NULL;
+ ic->i_send_hdrs = NULL;
+ ic->i_recv_hdrs = NULL;
+ ic->i_ack = NULL;
+ }
+ BUG_ON(ic->rds_ibdev);
+
+ /* Clear pending transmit */
+ if (ic->i_rm) {
+ rds_message_put(ic->i_rm);
+ ic->i_rm = NULL;
+ }
+
+ /* Clear the ACK state */
+ clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
+#ifdef KERNEL_HAS_ATOMIC64
+ atomic64_set(&ic->i_ack_next, 0);
+#else
+ ic->i_ack_next = 0;
+#endif
+ ic->i_ack_recv = 0;
+
+ /* Clear flow control state */
+ ic->i_flowctl = 0;
+ atomic_set(&ic->i_credits, 0);
+
+ rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
+ rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
+
+ if (ic->i_ibinc) {
+ rds_inc_put(&ic->i_ibinc->ii_inc);
+ ic->i_ibinc = NULL;
+ }
+
+ vfree(ic->i_sends);
+ ic->i_sends = NULL;
+ vfree(ic->i_recvs);
+ ic->i_recvs = NULL;
+}
+
+int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
+{
+ struct rds_ib_connection *ic;
+ unsigned long flags;
+
+ /* XXX too lazy? */
+ ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
+ if (ic == NULL)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ic->ib_node);
+ mutex_init(&ic->i_recv_mutex);
+#ifndef KERNEL_HAS_ATOMIC64
+ spin_lock_init(&ic->i_ack_lock);
+#endif
+
+ /*
+ * rds_ib_conn_shutdown() waits for these to be emptied so they
+ * must be initialized before it can be called.
+ */
+ rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
+ rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
+
+ ic->conn = conn;
+ conn->c_transport_data = ic;
+
+ spin_lock_irqsave(&ib_nodev_conns_lock, flags);
+ list_add_tail(&ic->ib_node, &ib_nodev_conns);
+ spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
+
+
+ rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
+ return 0;
+}
+
+void rds_ib_conn_free(void *arg)
+{
+ struct rds_ib_connection *ic = arg;
+ rdsdebug("ic %p\n", ic);
+ list_del(&ic->ib_node);
+ kfree(ic);
+}
+
+int __init rds_ib_listen_init(void)
+{
+ struct sockaddr_in sin;
+ struct rdma_cm_id *cm_id;
+ int ret;
+
+ cm_id = rdma_create_id(rds_ib_cm_event_handler, NULL, RDMA_PS_TCP);
+ if (IS_ERR(cm_id)) {
+ ret = PTR_ERR(cm_id);
+ printk(KERN_ERR "RDS/ib: failed to setup listener, "
+ "rdma_create_id() returned %d\n", ret);
+ goto out;
+ }
+
+ sin.sin_family = PF_INET,
+ sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
+ sin.sin_port = (__force u16)htons(RDS_PORT);
+
+ /*
+ * XXX I bet this binds the cm_id to a device. If we want to support
+ * fail-over we'll have to take this into consideration.
+ */
+ ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
+ if (ret) {
+ printk(KERN_ERR "RDS/ib: failed to setup listener, "
+ "rdma_bind_addr() returned %d\n", ret);
+ goto out;
+ }
+
+ ret = rdma_listen(cm_id, 128);
+ if (ret) {
+ printk(KERN_ERR "RDS/ib: failed to setup listener, "
+ "rdma_listen() returned %d\n", ret);
+ goto out;
+ }
+
+ rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
+
+ rds_ib_listen_id = cm_id;
+ cm_id = NULL;
+out:
+ if (cm_id)
+ rdma_destroy_id(cm_id);
+ return ret;
+}
+
+void rds_ib_listen_stop(void)
+{
+ if (rds_ib_listen_id) {
+ rdsdebug("cm %p\n", rds_ib_listen_id);
+ rdma_destroy_id(rds_ib_listen_id);
+ rds_ib_listen_id = NULL;
+ }
+}
+
+/*
+ * An error occurred on the connection
+ */
+void
+__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
+{
+ va_list ap;
+
+ rds_conn_drop(conn);
+
+ va_start(ap, fmt);
+ vprintk(fmt, ap);
+ va_end(ap);
+}
--
1.5.6.3
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