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krping.c
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/*
* Copyright (c) 2005 Ammasso, Inc. All rights reserved.
* Copyright (c) 2006-2009 Open Grid Computing, Inc. 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/version.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/proc_fs.h>
#include <linux/inet.h>
#include <linux/list.h>
#include <linux/in.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/time.h>
#include <linux/random.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <asm/atomic.h>
#include <asm/pci.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include "getopt.h"
#define PFX "krping: "
static int debug = 0;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none, 1=all)");
#define DEBUG_LOG if (debug) printk
MODULE_AUTHOR("Steve Wise");
MODULE_DESCRIPTION("RDMA ping server");
MODULE_LICENSE("Dual BSD/GPL");
enum mem_type {
DMA = 1,
REG = 2,
};
static const struct krping_option krping_opts[] = {
{"count", OPT_INT, 'C'},
{"size", OPT_INT, 'S'},
{"addr", OPT_STRING, 'a'},
{"addr6", OPT_STRING, 'A'},
{"port", OPT_INT, 'p'},
{"verbose", OPT_NOPARAM, 'v'},
{"validate", OPT_NOPARAM, 'V'},
{"server", OPT_NOPARAM, 's'},
{"client", OPT_NOPARAM, 'c'},
{"mem_mode", OPT_STRING, 'm'},
{"server_inv", OPT_NOPARAM, 'I'},
{"wlat", OPT_NOPARAM, 'l'},
{"rlat", OPT_NOPARAM, 'L'},
{"bw", OPT_NOPARAM, 'B'},
{"duplex", OPT_NOPARAM, 'd'},
{"txdepth", OPT_INT, 'T'},
{"poll", OPT_NOPARAM, 'P'},
{"local_dma_lkey", OPT_NOPARAM, 'Z'},
{"read_inv", OPT_NOPARAM, 'R'},
{"fr", OPT_NOPARAM, 'f'},
{NULL, 0, 0}
};
struct krping_stats {
unsigned long long send_bytes;
unsigned long long send_msgs;
unsigned long long recv_bytes;
unsigned long long recv_msgs;
unsigned long long write_bytes;
unsigned long long write_msgs;
unsigned long long read_bytes;
unsigned long long read_msgs;
};
#define htonll(x) cpu_to_be64((x))
#define ntohll(x) cpu_to_be64((x))
static DEFINE_MUTEX(krping_mutex);
/*
* List of running krping threads.
*/
static LIST_HEAD(krping_cbs);
static struct proc_dir_entry *krping_proc;
/*
* Invoke like this, one on each side, using the server's address on
* the RDMA device (iw%d):
*
* /bin/echo server,port=9999,addr=192.168.69.142,validate > /proc/krping
* /bin/echo client,port=9999,addr=192.168.69.142,validate > /proc/krping
* /bin/echo client,port=9999,addr6=2001:db8:0:f101::1,validate > /proc/krping
*
* krping "ping/pong" loop:
* client sends source rkey/addr/len
* server receives source rkey/add/len
* server rdma reads "ping" data from source
* server sends "go ahead" on rdma read completion
* client sends sink rkey/addr/len
* server receives sink rkey/addr/len
* server rdma writes "pong" data to sink
* server sends "go ahead" on rdma write completion
* <repeat loop>
*/
/*
* These states are used to signal events between the completion handler
* and the main client or server thread.
*
* Once CONNECTED, they cycle through RDMA_READ_ADV, RDMA_WRITE_ADV,
* and RDMA_WRITE_COMPLETE for each ping.
*/
enum test_state {
IDLE = 1,
CONNECT_REQUEST,
ADDR_RESOLVED,
ROUTE_RESOLVED,
CONNECTED,
RDMA_READ_ADV,
RDMA_READ_COMPLETE,
RDMA_WRITE_ADV,
RDMA_WRITE_COMPLETE,
ERROR
};
struct krping_rdma_info {
uint64_t buf;
uint32_t rkey;
uint32_t size;
};
/*
* Default max buffer size for IO...
*/
#define RPING_BUFSIZE 128*1024
#define RPING_SQ_DEPTH 64
/*
* Control block struct.
*/
struct krping_cb {
int server; /* 0 iff client */
struct ib_cq *cq;
struct ib_pd *pd;
struct ib_qp *qp;
enum mem_type mem;
struct ib_mr *dma_mr;
struct ib_fast_reg_page_list *page_list;
int page_list_len;
struct ib_reg_wr reg_mr_wr;
struct ib_send_wr invalidate_wr;
struct ib_mr *reg_mr;
int server_invalidate;
int read_inv;
u8 key;
struct ib_recv_wr rq_wr; /* recv work request record */
struct ib_sge recv_sgl; /* recv single SGE */
struct krping_rdma_info recv_buf;/* malloc'd buffer */
u64 recv_dma_addr;
DECLARE_PCI_UNMAP_ADDR(recv_mapping)
struct ib_send_wr sq_wr; /* send work requrest record */
struct ib_sge send_sgl;
struct krping_rdma_info send_buf;/* single send buf */
u64 send_dma_addr;
DECLARE_PCI_UNMAP_ADDR(send_mapping)
struct ib_rdma_wr rdma_sq_wr; /* rdma work request record */
struct ib_sge rdma_sgl; /* rdma single SGE */
char *rdma_buf; /* used as rdma sink */
u64 rdma_dma_addr;
DECLARE_PCI_UNMAP_ADDR(rdma_mapping)
struct ib_mr *rdma_mr;
uint32_t remote_rkey; /* remote guys RKEY */
uint64_t remote_addr; /* remote guys TO */
uint32_t remote_len; /* remote guys LEN */
char *start_buf; /* rdma read src */
u64 start_dma_addr;
DECLARE_PCI_UNMAP_ADDR(start_mapping)
struct ib_mr *start_mr;
enum test_state state; /* used for cond/signalling */
wait_queue_head_t sem;
struct krping_stats stats;
uint16_t port; /* dst port in NBO */
u8 addr[16]; /* dst addr in NBO */
char *addr_str; /* dst addr string */
uint8_t addr_type; /* ADDR_FAMILY - IPv4/V6 */
int verbose; /* verbose logging */
int count; /* ping count */
int size; /* ping data size */
int validate; /* validate ping data */
int wlat; /* run wlat test */
int rlat; /* run rlat test */
int bw; /* run bw test */
int duplex; /* run bw full duplex test */
int poll; /* poll or block for rlat test */
int txdepth; /* SQ depth */
int local_dma_lkey; /* use 0 for lkey */
int frtest; /* reg test */
/* CM stuff */
struct rdma_cm_id *cm_id; /* connection on client side,*/
/* listener on server side. */
struct rdma_cm_id *child_cm_id; /* connection on server side */
struct list_head list;
};
static int krping_cma_event_handler(struct rdma_cm_id *cma_id,
struct rdma_cm_event *event)
{
int ret;
struct krping_cb *cb = cma_id->context;
DEBUG_LOG("cma_event type %d cma_id %p (%s)\n", event->event, cma_id,
(cma_id == cb->cm_id) ? "parent" : "child");
switch (event->event) {
case RDMA_CM_EVENT_ADDR_RESOLVED:
cb->state = ADDR_RESOLVED;
ret = rdma_resolve_route(cma_id, 2000);
if (ret) {
printk(KERN_ERR PFX "rdma_resolve_route error %d\n",
ret);
wake_up_interruptible(&cb->sem);
}
break;
case RDMA_CM_EVENT_ROUTE_RESOLVED:
cb->state = ROUTE_RESOLVED;
wake_up_interruptible(&cb->sem);
break;
case RDMA_CM_EVENT_CONNECT_REQUEST:
cb->state = CONNECT_REQUEST;
cb->child_cm_id = cma_id;
DEBUG_LOG("child cma %p\n", cb->child_cm_id);
wake_up_interruptible(&cb->sem);
break;
case RDMA_CM_EVENT_ESTABLISHED:
DEBUG_LOG("ESTABLISHED\n");
if (!cb->server) {
cb->state = CONNECTED;
}
wake_up_interruptible(&cb->sem);
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:
printk(KERN_ERR PFX "cma event %d, error %d\n", event->event,
event->status);
cb->state = ERROR;
wake_up_interruptible(&cb->sem);
break;
case RDMA_CM_EVENT_DISCONNECTED:
printk(KERN_ERR PFX "DISCONNECT EVENT...\n");
cb->state = ERROR;
wake_up_interruptible(&cb->sem);
break;
case RDMA_CM_EVENT_DEVICE_REMOVAL:
printk(KERN_ERR PFX "cma detected device removal!!!!\n");
break;
default:
printk(KERN_ERR PFX "oof bad type!\n");
wake_up_interruptible(&cb->sem);
break;
}
return 0;
}
static int server_recv(struct krping_cb *cb, struct ib_wc *wc)
{
if (wc->byte_len != sizeof(cb->recv_buf)) {
printk(KERN_ERR PFX "Received bogus data, size %d\n",
wc->byte_len);
return -1;
}
cb->remote_rkey = ntohl(cb->recv_buf.rkey);
cb->remote_addr = ntohll(cb->recv_buf.buf);
cb->remote_len = ntohl(cb->recv_buf.size);
DEBUG_LOG("Received rkey %x addr %llx len %d from peer\n",
cb->remote_rkey, (unsigned long long)cb->remote_addr,
cb->remote_len);
if (cb->state <= CONNECTED || cb->state == RDMA_WRITE_COMPLETE)
cb->state = RDMA_READ_ADV;
else
cb->state = RDMA_WRITE_ADV;
return 0;
}
static int client_recv(struct krping_cb *cb, struct ib_wc *wc)
{
if (wc->byte_len != sizeof(cb->recv_buf)) {
printk(KERN_ERR PFX "Received bogus data, size %d\n",
wc->byte_len);
return -1;
}
if (cb->state == RDMA_READ_ADV)
cb->state = RDMA_WRITE_ADV;
else
cb->state = RDMA_WRITE_COMPLETE;
return 0;
}
static void krping_cq_event_handler(struct ib_cq *cq, void *ctx)
{
struct krping_cb *cb = ctx;
struct ib_wc wc;
struct ib_recv_wr *bad_wr;
int ret;
BUG_ON(cb->cq != cq);
if (cb->state == ERROR) {
printk(KERN_ERR PFX "cq completion in ERROR state\n");
return;
}
if (cb->frtest) {
printk(KERN_ERR PFX "cq completion event in frtest!\n");
return;
}
if (!cb->wlat && !cb->rlat && !cb->bw)
ib_req_notify_cq(cb->cq, IB_CQ_NEXT_COMP);
while ((ret = ib_poll_cq(cb->cq, 1, &wc)) == 1) {
if (wc.status) {
if (wc.status == IB_WC_WR_FLUSH_ERR) {
DEBUG_LOG("cq flushed\n");
continue;
} else {
printk(KERN_ERR PFX "cq completion failed with "
"wr_id %Lx status %d opcode %d vender_err %x\n",
wc.wr_id, wc.status, wc.opcode, wc.vendor_err);
goto error;
}
}
switch (wc.opcode) {
case IB_WC_SEND:
DEBUG_LOG("send completion\n");
cb->stats.send_bytes += cb->send_sgl.length;
cb->stats.send_msgs++;
break;
case IB_WC_RDMA_WRITE:
DEBUG_LOG("rdma write completion\n");
cb->stats.write_bytes += cb->rdma_sq_wr.wr.sg_list->length;
cb->stats.write_msgs++;
cb->state = RDMA_WRITE_COMPLETE;
wake_up_interruptible(&cb->sem);
break;
case IB_WC_RDMA_READ:
DEBUG_LOG("rdma read completion\n");
cb->stats.read_bytes += cb->rdma_sq_wr.wr.sg_list->length;
cb->stats.read_msgs++;
cb->state = RDMA_READ_COMPLETE;
wake_up_interruptible(&cb->sem);
break;
case IB_WC_RECV:
DEBUG_LOG("recv completion\n");
cb->stats.recv_bytes += sizeof(cb->recv_buf);
cb->stats.recv_msgs++;
if (cb->wlat || cb->rlat || cb->bw)
ret = server_recv(cb, &wc);
else
ret = cb->server ? server_recv(cb, &wc) :
client_recv(cb, &wc);
if (ret) {
printk(KERN_ERR PFX "recv wc error: %d\n", ret);
goto error;
}
ret = ib_post_recv(cb->qp, &cb->rq_wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX "post recv error: %d\n",
ret);
goto error;
}
wake_up_interruptible(&cb->sem);
break;
default:
printk(KERN_ERR PFX
"%s:%d Unexpected opcode %d, Shutting down\n",
__func__, __LINE__, wc.opcode);
goto error;
}
}
if (ret) {
printk(KERN_ERR PFX "poll error %d\n", ret);
goto error;
}
return;
error:
cb->state = ERROR;
wake_up_interruptible(&cb->sem);
}
static int krping_accept(struct krping_cb *cb)
{
struct rdma_conn_param conn_param;
int ret;
DEBUG_LOG("accepting client connection request\n");
memset(&conn_param, 0, sizeof conn_param);
conn_param.responder_resources = 1;
conn_param.initiator_depth = 1;
ret = rdma_accept(cb->child_cm_id, &conn_param);
if (ret) {
printk(KERN_ERR PFX "rdma_accept error: %d\n", ret);
return ret;
}
if (!cb->wlat && !cb->rlat && !cb->bw) {
wait_event_interruptible(cb->sem, cb->state >= CONNECTED);
if (cb->state == ERROR) {
printk(KERN_ERR PFX "wait for CONNECTED state %d\n",
cb->state);
return -1;
}
}
return 0;
}
static void krping_setup_wr(struct krping_cb *cb)
{
cb->recv_sgl.addr = cb->recv_dma_addr;
cb->recv_sgl.length = sizeof cb->recv_buf;
cb->recv_sgl.lkey = cb->qp->device->local_dma_lkey;
cb->rq_wr.sg_list = &cb->recv_sgl;
cb->rq_wr.num_sge = 1;
cb->send_sgl.addr = cb->send_dma_addr;
cb->send_sgl.length = sizeof cb->send_buf;
cb->send_sgl.lkey = cb->qp->device->local_dma_lkey;
cb->sq_wr.opcode = IB_WR_SEND;
cb->sq_wr.send_flags = IB_SEND_SIGNALED;
cb->sq_wr.sg_list = &cb->send_sgl;
cb->sq_wr.num_sge = 1;
if (cb->server || cb->wlat || cb->rlat || cb->bw) {
cb->rdma_sgl.addr = cb->rdma_dma_addr;
cb->rdma_sq_wr.wr.send_flags = IB_SEND_SIGNALED;
cb->rdma_sq_wr.wr.sg_list = &cb->rdma_sgl;
cb->rdma_sq_wr.wr.num_sge = 1;
}
switch(cb->mem) {
case REG:
/*
* A chain of 2 WRs, INVALDATE_MR + REG_MR.
* both unsignaled. The client uses them to reregister
* the rdma buffers with a new key each iteration.
*/
cb->reg_mr_wr.wr.opcode = IB_WR_REG_MR;
cb->reg_mr_wr.mr = cb->reg_mr;
cb->invalidate_wr.next = &cb->reg_mr_wr.wr;
cb->invalidate_wr.opcode = IB_WR_LOCAL_INV;
break;
default:
break;
}
}
static int krping_setup_buffers(struct krping_cb *cb)
{
int ret;
DEBUG_LOG(PFX "krping_setup_buffers called on cb %p\n", cb);
cb->recv_dma_addr = dma_map_single(cb->pd->device->dma_device,
&cb->recv_buf,
sizeof(cb->recv_buf), DMA_BIDIRECTIONAL);
pci_unmap_addr_set(cb, recv_mapping, cb->recv_dma_addr);
cb->send_dma_addr = dma_map_single(cb->pd->device->dma_device,
&cb->send_buf, sizeof(cb->send_buf),
DMA_BIDIRECTIONAL);
pci_unmap_addr_set(cb, send_mapping, cb->send_dma_addr);
if (cb->mem == DMA) {
cb->dma_mr = ib_get_dma_mr(cb->pd, IB_ACCESS_LOCAL_WRITE|
IB_ACCESS_REMOTE_READ|
IB_ACCESS_REMOTE_WRITE);
if (IS_ERR(cb->dma_mr)) {
DEBUG_LOG(PFX "reg_dmamr failed\n");
ret = PTR_ERR(cb->dma_mr);
goto bail;
}
}
cb->rdma_buf = kmalloc(cb->size, GFP_KERNEL);
if (!cb->rdma_buf) {
DEBUG_LOG(PFX "rdma_buf malloc failed\n");
ret = -ENOMEM;
goto bail;
}
cb->rdma_dma_addr = dma_map_single(cb->pd->device->dma_device,
cb->rdma_buf, cb->size,
DMA_BIDIRECTIONAL);
pci_unmap_addr_set(cb, rdma_mapping, cb->rdma_dma_addr);
if (cb->mem == REG) {
cb->page_list_len = (((cb->size - 1) & PAGE_MASK) + PAGE_SIZE)
>> PAGE_SHIFT;
cb->reg_mr = ib_alloc_mr(cb->pd, IB_MR_TYPE_MEM_REG,
cb->page_list_len);
if (IS_ERR(cb->reg_mr)) {
ret = PTR_ERR(cb->reg_mr);
DEBUG_LOG(PFX "recv_buf reg_mr failed %d\n", ret);
goto bail;
}
DEBUG_LOG(PFX "reg rkey 0x%x page_list_len %u\n",
cb->reg_mr->rkey, cb->page_list_len);
}
if (!cb->server || cb->wlat || cb->rlat || cb->bw) {
cb->start_buf = kmalloc(cb->size, GFP_KERNEL);
if (!cb->start_buf) {
DEBUG_LOG(PFX "start_buf malloc failed\n");
ret = -ENOMEM;
goto bail;
}
cb->start_dma_addr = dma_map_single(cb->pd->device->dma_device,
cb->start_buf, cb->size,
DMA_BIDIRECTIONAL);
pci_unmap_addr_set(cb, start_mapping, cb->start_dma_addr);
}
krping_setup_wr(cb);
DEBUG_LOG(PFX "allocated & registered buffers...\n");
return 0;
bail:
if (cb->reg_mr && !IS_ERR(cb->reg_mr))
ib_dereg_mr(cb->reg_mr);
if (cb->rdma_mr && !IS_ERR(cb->rdma_mr))
ib_dereg_mr(cb->rdma_mr);
if (cb->dma_mr && !IS_ERR(cb->dma_mr))
ib_dereg_mr(cb->dma_mr);
if (cb->rdma_buf)
kfree(cb->rdma_buf);
if (cb->start_buf)
kfree(cb->start_buf);
return ret;
}
static void krping_free_buffers(struct krping_cb *cb)
{
DEBUG_LOG("krping_free_buffers called on cb %p\n", cb);
if (cb->dma_mr)
ib_dereg_mr(cb->dma_mr);
if (cb->rdma_mr)
ib_dereg_mr(cb->rdma_mr);
if (cb->start_mr)
ib_dereg_mr(cb->start_mr);
if (cb->reg_mr)
ib_dereg_mr(cb->reg_mr);
dma_unmap_single(cb->pd->device->dma_device,
pci_unmap_addr(cb, recv_mapping),
sizeof(cb->recv_buf), DMA_BIDIRECTIONAL);
dma_unmap_single(cb->pd->device->dma_device,
pci_unmap_addr(cb, send_mapping),
sizeof(cb->send_buf), DMA_BIDIRECTIONAL);
dma_unmap_single(cb->pd->device->dma_device,
pci_unmap_addr(cb, rdma_mapping),
cb->size, DMA_BIDIRECTIONAL);
kfree(cb->rdma_buf);
if (cb->start_buf) {
dma_unmap_single(cb->pd->device->dma_device,
pci_unmap_addr(cb, start_mapping),
cb->size, DMA_BIDIRECTIONAL);
kfree(cb->start_buf);
}
}
static int krping_create_qp(struct krping_cb *cb)
{
struct ib_qp_init_attr init_attr;
int ret;
memset(&init_attr, 0, sizeof(init_attr));
init_attr.cap.max_send_wr = cb->txdepth;
init_attr.cap.max_recv_wr = 2;
init_attr.cap.max_recv_sge = 1;
init_attr.cap.max_send_sge = 1;
init_attr.qp_type = IB_QPT_RC;
init_attr.send_cq = cb->cq;
init_attr.recv_cq = cb->cq;
init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
if (cb->server) {
ret = rdma_create_qp(cb->child_cm_id, cb->pd, &init_attr);
if (!ret)
cb->qp = cb->child_cm_id->qp;
} else {
ret = rdma_create_qp(cb->cm_id, cb->pd, &init_attr);
if (!ret)
cb->qp = cb->cm_id->qp;
}
return ret;
}
static void krping_free_qp(struct krping_cb *cb)
{
ib_destroy_qp(cb->qp);
ib_destroy_cq(cb->cq);
ib_dealloc_pd(cb->pd);
}
static int krping_setup_qp(struct krping_cb *cb, struct rdma_cm_id *cm_id)
{
int ret;
struct ib_cq_init_attr attr = {0};
cb->pd = ib_alloc_pd(cm_id->device);
if (IS_ERR(cb->pd)) {
printk(KERN_ERR PFX "ib_alloc_pd failed\n");
return PTR_ERR(cb->pd);
}
DEBUG_LOG("created pd %p\n", cb->pd);
attr.cqe = cb->txdepth * 2;
attr.comp_vector = 0;
cb->cq = ib_create_cq(cm_id->device, krping_cq_event_handler, NULL,
cb, &attr);
if (IS_ERR(cb->cq)) {
printk(KERN_ERR PFX "ib_create_cq failed\n");
ret = PTR_ERR(cb->cq);
goto err1;
}
DEBUG_LOG("created cq %p\n", cb->cq);
if (!cb->wlat && !cb->rlat && !cb->bw && !cb->frtest) {
ret = ib_req_notify_cq(cb->cq, IB_CQ_NEXT_COMP);
if (ret) {
printk(KERN_ERR PFX "ib_create_cq failed\n");
goto err2;
}
}
ret = krping_create_qp(cb);
if (ret) {
printk(KERN_ERR PFX "krping_create_qp failed: %d\n", ret);
goto err2;
}
DEBUG_LOG("created qp %p\n", cb->qp);
return 0;
err2:
ib_destroy_cq(cb->cq);
err1:
ib_dealloc_pd(cb->pd);
return ret;
}
/*
* return the (possibly rebound) rkey for the rdma buffer.
* REG mode: invalidate and rebind via reg wr.
* other modes: just return the mr rkey.
*/
static u32 krping_rdma_rkey(struct krping_cb *cb, u64 buf, int post_inv)
{
u32 rkey;
struct ib_send_wr *bad_wr;
int ret;
struct scatterlist sg = {0};
if (cb->mem == REG) {
cb->invalidate_wr.ex.invalidate_rkey = cb->reg_mr->rkey;
/*
* Update the reg key.
*/
ib_update_fast_reg_key(cb->reg_mr, ++cb->key);
cb->reg_mr_wr.key = cb->reg_mr->rkey;
/*
* Update the reg WR with new buf info.
*/
if (buf == (u64)cb->start_dma_addr)
cb->reg_mr_wr.access = IB_ACCESS_REMOTE_READ;
else
cb->reg_mr_wr.access = IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE;
sg_dma_address(&sg) = buf;
sg_dma_len(&sg) = cb->size;
ret = ib_map_mr_sg(cb->reg_mr, &sg, 1, NULL, PAGE_SIZE);
BUG_ON(ret <= 0 || ret > cb->page_list_len);
DEBUG_LOG(PFX "post_inv = %d, reg_mr new rkey 0x%x pgsz %u len %u"
" iova_start %llx\n",
post_inv,
cb->reg_mr_wr.key,
cb->reg_mr->page_size,
cb->reg_mr->length,
cb->reg_mr->iova);
if (post_inv)
ret = ib_post_send(cb->qp, &cb->invalidate_wr, &bad_wr);
else
ret = ib_post_send(cb->qp, &cb->reg_mr_wr.wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX "post send error %d\n", ret);
cb->state = ERROR;
}
rkey = cb->reg_mr->rkey;
} else
rkey = cb->dma_mr->rkey;
return rkey;
}
static void krping_format_send(struct krping_cb *cb, u64 buf)
{
struct krping_rdma_info *info = &cb->send_buf;
u32 rkey;
/*
* Client side will do reg or mw bind before
* advertising the rdma buffer. Server side
* sends have no data.
*/
if (!cb->server || cb->wlat || cb->rlat || cb->bw) {
rkey = krping_rdma_rkey(cb, buf, !cb->server_invalidate);
info->buf = htonll(buf);
info->rkey = htonl(rkey);
info->size = htonl(cb->size);
DEBUG_LOG("RDMA addr %llx rkey %x len %d\n",
(unsigned long long)buf, rkey, cb->size);
}
}
static void krping_test_server(struct krping_cb *cb)
{
struct ib_send_wr *bad_wr, inv;
int ret;
while (1) {
/* Wait for client's Start STAG/TO/Len */
wait_event_interruptible(cb->sem, cb->state >= RDMA_READ_ADV);
if (cb->state != RDMA_READ_ADV) {
printk(KERN_ERR PFX "wait for RDMA_READ_ADV state %d\n",
cb->state);
break;
}
DEBUG_LOG("server received sink adv\n");
cb->rdma_sq_wr.rkey = cb->remote_rkey;
cb->rdma_sq_wr.remote_addr = cb->remote_addr;
cb->rdma_sq_wr.wr.sg_list->length = cb->remote_len;
cb->rdma_sgl.lkey = krping_rdma_rkey(cb, cb->rdma_dma_addr, 1);
cb->rdma_sq_wr.wr.next = NULL;
/* Issue RDMA Read. */
if (cb->read_inv)
cb->rdma_sq_wr.wr.opcode = IB_WR_RDMA_READ_WITH_INV;
else {
cb->rdma_sq_wr.wr.opcode = IB_WR_RDMA_READ;
if (cb->mem == REG) {
/*
* Immediately follow the read with a
* fenced LOCAL_INV.
*/
cb->rdma_sq_wr.wr.next = &inv;
memset(&inv, 0, sizeof inv);
inv.opcode = IB_WR_LOCAL_INV;
inv.ex.invalidate_rkey = cb->reg_mr->rkey;
inv.send_flags = IB_SEND_FENCE;
}
}
ret = ib_post_send(cb->qp, &cb->rdma_sq_wr.wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX "post send error %d\n", ret);
break;
}
cb->rdma_sq_wr.wr.next = NULL;
DEBUG_LOG("server posted rdma read req \n");
/* Wait for read completion */
wait_event_interruptible(cb->sem,
cb->state >= RDMA_READ_COMPLETE);
if (cb->state != RDMA_READ_COMPLETE) {
printk(KERN_ERR PFX
"wait for RDMA_READ_COMPLETE state %d\n",
cb->state);
break;
}
DEBUG_LOG("server received read complete\n");
/* Display data in recv buf */
if (cb->verbose)
printk(KERN_INFO PFX "server ping data: %s\n",
cb->rdma_buf);
/* Tell client to continue */
if (cb->server && cb->server_invalidate) {
cb->sq_wr.ex.invalidate_rkey = cb->remote_rkey;
cb->sq_wr.opcode = IB_WR_SEND_WITH_INV;
DEBUG_LOG("send-w-inv rkey 0x%x\n", cb->remote_rkey);
}
ret = ib_post_send(cb->qp, &cb->sq_wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX "post send error %d\n", ret);
break;
}
DEBUG_LOG("server posted go ahead\n");
/* Wait for client's RDMA STAG/TO/Len */
wait_event_interruptible(cb->sem, cb->state >= RDMA_WRITE_ADV);
if (cb->state != RDMA_WRITE_ADV) {
printk(KERN_ERR PFX
"wait for RDMA_WRITE_ADV state %d\n",
cb->state);
break;
}
DEBUG_LOG("server received sink adv\n");
/* RDMA Write echo data */
cb->rdma_sq_wr.wr.opcode = IB_WR_RDMA_WRITE;
cb->rdma_sq_wr.rkey = cb->remote_rkey;
cb->rdma_sq_wr.remote_addr = cb->remote_addr;
cb->rdma_sq_wr.wr.sg_list->length = strlen(cb->rdma_buf) + 1;
if (cb->local_dma_lkey)
cb->rdma_sgl.lkey = cb->qp->device->local_dma_lkey;
else
cb->rdma_sgl.lkey = krping_rdma_rkey(cb, cb->rdma_dma_addr, 0);
DEBUG_LOG("rdma write from lkey %x laddr %llx len %d\n",
cb->rdma_sq_wr.wr.sg_list->lkey,
(unsigned long long)cb->rdma_sq_wr.wr.sg_list->addr,
cb->rdma_sq_wr.wr.sg_list->length);
ret = ib_post_send(cb->qp, &cb->rdma_sq_wr.wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX "post send error %d\n", ret);
break;
}
/* Wait for completion */
ret = wait_event_interruptible(cb->sem, cb->state >=
RDMA_WRITE_COMPLETE);
if (cb->state != RDMA_WRITE_COMPLETE) {
printk(KERN_ERR PFX
"wait for RDMA_WRITE_COMPLETE state %d\n",
cb->state);
break;
}
DEBUG_LOG("server rdma write complete \n");
cb->state = CONNECTED;
/* Tell client to begin again */
if (cb->server && cb->server_invalidate) {
cb->sq_wr.ex.invalidate_rkey = cb->remote_rkey;
cb->sq_wr.opcode = IB_WR_SEND_WITH_INV;
DEBUG_LOG("send-w-inv rkey 0x%x\n", cb->remote_rkey);
}
ret = ib_post_send(cb->qp, &cb->sq_wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX "post send error %d\n", ret);
break;
}
DEBUG_LOG("server posted go ahead\n");
}
}
static void rlat_test(struct krping_cb *cb)
{
int scnt;
int iters = cb->count;
struct timeval start_tv, stop_tv;
int ret;
struct ib_wc wc;
struct ib_send_wr *bad_wr;
int ne;
scnt = 0;
cb->rdma_sq_wr.wr.opcode = IB_WR_RDMA_READ;
cb->rdma_sq_wr.rkey = cb->remote_rkey;
cb->rdma_sq_wr.remote_addr = cb->remote_addr;
cb->rdma_sq_wr.wr.sg_list->length = cb->size;
do_gettimeofday(&start_tv);
if (!cb->poll) {
cb->state = RDMA_READ_ADV;
ib_req_notify_cq(cb->cq, IB_CQ_NEXT_COMP);
}
while (scnt < iters) {
cb->state = RDMA_READ_ADV;
ret = ib_post_send(cb->qp, &cb->rdma_sq_wr.wr, &bad_wr);
if (ret) {
printk(KERN_ERR PFX
"Couldn't post send: ret=%d scnt %d\n",
ret, scnt);
return;
}
do {
if (!cb->poll) {
wait_event_interruptible(cb->sem,
cb->state != RDMA_READ_ADV);
if (cb->state == RDMA_READ_COMPLETE) {
ne = 1;
ib_req_notify_cq(cb->cq,
IB_CQ_NEXT_COMP);
} else {
ne = -1;
}
} else
ne = ib_poll_cq(cb->cq, 1, &wc);
if (cb->state == ERROR) {
printk(KERN_ERR PFX
"state == ERROR...bailing scnt %d\n",
scnt);
return;
}
} while (ne == 0);
if (ne < 0) {
printk(KERN_ERR PFX "poll CQ failed %d\n", ne);
return;
}
if (cb->poll && wc.status != IB_WC_SUCCESS) {
printk(KERN_ERR PFX "Completion wth error at %s:\n",
cb->server ? "server" : "client");
printk(KERN_ERR PFX "Failed status %d: wr_id %d\n",
wc.status, (int) wc.wr_id);
return;
}
++scnt;
}
do_gettimeofday(&stop_tv);