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RDS: Implement atomic operations 

Implement a CMSG-based interface to do FADD and CSWP ops.

Alter send routines to handle atomic ops.

Add atomic counters to stats.

Add xmit_atomic() to struct rds_transport

Inline rds_ib_send_unmap_rdma into unmap_rm

Signed-off-by: Andy Grover <andy.grover@oracle.com>
This commit is contained in:
Andy Grover 2010-01-12 14:33:38 -08:00
parent a63273d499
commit 15133f6e67
9 changed files with 321 additions and 23 deletions
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19
include/linux/rds.h
View File

@ -73,6 +73,8 @@
#define RDS_CMSG_RDMA_MAP 3
#define RDS_CMSG_RDMA_STATUS 4
#define RDS_CMSG_CONG_UPDATE 5
#define RDS_CMSG_ATOMIC_FADD 6
#define RDS_CMSG_ATOMIC_CSWP 7
#define RDS_INFO_FIRST 10000
#define RDS_INFO_COUNTERS 10000
@ -237,6 +239,23 @@ struct rds_rdma_args {
u_int64_t user_token;
};
struct rds_atomic_args {
rds_rdma_cookie_t cookie;
uint64_t local_addr;
uint64_t remote_addr;
union {
struct {
uint64_t compare;
uint64_t swap;
} cswp;
struct {
uint64_t add;
} fadd;
};
uint64_t flags;
uint64_t user_token;
};
struct rds_rdma_notify {
u_int64_t user_token;
int32_t status;

1
net/rds/ib.c
View File

@ -264,6 +264,7 @@ struct rds_transport rds_ib_transport = {
.xmit = rds_ib_xmit,
.xmit_cong_map = NULL,
.xmit_rdma = rds_ib_xmit_rdma,
.xmit_atomic = rds_ib_xmit_atomic,
.recv = rds_ib_recv,
.conn_alloc = rds_ib_conn_alloc,
.conn_free = rds_ib_conn_free,

1
net/rds/ib.h
View File

@ -336,6 +336,7 @@ 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, int need_posted, int max_posted);
int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
/* ib_stats.c */
DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);

4
net/rds/ib_rdma.c
View File

@ -298,7 +298,9 @@ static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev)
ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
(IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE),
IB_ACCESS_REMOTE_WRITE|
IB_ACCESS_REMOTE_ATOMIC),
&pool->fmr_attr);
if (IS_ERR(ibmr->fmr)) {
err = PTR_ERR(ibmr->fmr);

138
net/rds/ib_send.c
View File

@ -62,15 +62,17 @@ static void rds_ib_send_rdma_complete(struct rds_message *rm,
rds_rdma_send_complete(rm, notify_status);
}
static void rds_ib_send_unmap_rdma(struct rds_ib_connection *ic,
struct rds_rdma_op *op)
static void rds_ib_send_atomic_complete(struct rds_message *rm,
int wc_status)
{
if (op->r_mapped) {
ib_dma_unmap_sg(ic->i_cm_id->device,
op->r_sg, op->r_nents,
op->r_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
op->r_mapped = 0;
}
int notify_status;
if (wc_status != IB_WC_SUCCESS)
notify_status = RDS_RDMA_OTHER_ERROR;
else
notify_status = RDS_RDMA_SUCCESS;
rds_atomic_send_complete(rm, notify_status);
}
static void rds_ib_send_unmap_rm(struct rds_ib_connection *ic,
@ -86,7 +88,14 @@ static void rds_ib_send_unmap_rm(struct rds_ib_connection *ic,
DMA_TO_DEVICE);
if (rm->rdma.m_rdma_op.r_active) {
rds_ib_send_unmap_rdma(ic, &rm->rdma.m_rdma_op);
struct rds_rdma_op *op = &rm->rdma.m_rdma_op;
if (op->r_mapped) {
ib_dma_unmap_sg(ic->i_cm_id->device,
op->r_sg, op->r_nents,
op->r_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
op->r_mapped = 0;
}
/* If the user asked for a completion notification on this
* message, we can implement three different semantics:
@ -116,6 +125,24 @@ static void rds_ib_send_unmap_rm(struct rds_ib_connection *ic,
rds_stats_add(s_recv_rdma_bytes, rm->rdma.m_rdma_op.r_bytes);
}
if (rm->atomic.op_active) {
struct rm_atomic_op *op = &rm->atomic;
/* unmap atomic recvbuf */
if (op->op_mapped) {
ib_dma_unmap_sg(ic->i_cm_id->device, op->op_sg, 1,
DMA_FROM_DEVICE);
op->op_mapped = 0;
}
rds_ib_send_atomic_complete(rm, wc_status);
if (rm->atomic.op_type == RDS_ATOMIC_TYPE_CSWP)
rds_stats_inc(s_atomic_cswp);
else
rds_stats_inc(s_atomic_fadd);
}
/* If anyone waited for this message to get flushed out, wake
* them up now */
rds_message_unmapped(rm);
@ -158,12 +185,9 @@ void rds_ib_send_clear_ring(struct rds_ib_connection *ic)
u32 i;
for (i = 0, send = ic->i_sends; i < ic->i_send_ring.w_nr; i++, send++) {
if (send->s_wr.opcode == 0xdead)
if (!send->s_rm || send->s_wr.opcode == 0xdead)
continue;
if (send->s_rm)
rds_ib_send_unmap_rm(ic, send, IB_WC_WR_FLUSH_ERR);
if (send->s_op)
rds_ib_send_unmap_rdma(ic, send->s_op);
}
}
@ -218,6 +242,8 @@ void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context)
break;
case IB_WR_RDMA_WRITE:
case IB_WR_RDMA_READ:
case IB_WR_ATOMIC_FETCH_AND_ADD:
case IB_WR_ATOMIC_CMP_AND_SWP:
/* Nothing to be done - the SG list will be unmapped
* when the SEND completes. */
break;
@ -243,8 +269,7 @@ void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context)
rm = rds_send_get_message(conn, send->s_op);
if (rm) {
if (rm->rdma.m_rdma_op.r_active)
rds_ib_send_unmap_rdma(ic, &rm->rdma.m_rdma_op);
rds_ib_send_unmap_rm(ic, send, wc.status);
rds_ib_send_rdma_complete(rm, wc.status);
rds_message_put(rm);
}
@ -736,6 +761,89 @@ out:
return ret;
}
/*
* Issue atomic operation.
* A simplified version of the rdma case, we always map 1 SG, and
* only 8 bytes, for the return value from the atomic operation.
*/
int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op)
{
struct rds_ib_connection *ic = conn->c_transport_data;
struct rds_ib_send_work *send = NULL;
struct ib_send_wr *failed_wr;
struct rds_ib_device *rds_ibdev;
u32 pos;
u32 work_alloc;
int ret;
rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
work_alloc = rds_ib_ring_alloc(&ic->i_send_ring, 1, &pos);
if (work_alloc != 1) {
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
rds_ib_stats_inc(s_ib_tx_ring_full);
ret = -ENOMEM;
goto out;
}
/* address of send request in ring */
send = &ic->i_sends[pos];
send->s_queued = jiffies;
if (op->op_type == RDS_ATOMIC_TYPE_CSWP) {
send->s_wr.opcode = IB_WR_ATOMIC_CMP_AND_SWP;
send->s_wr.wr.atomic.compare_add = op->op_compare;
send->s_wr.wr.atomic.swap = op->op_swap_add;
} else { /* FADD */
send->s_wr.opcode = IB_WR_ATOMIC_FETCH_AND_ADD;
send->s_wr.wr.atomic.compare_add = op->op_swap_add;
send->s_wr.wr.atomic.swap = 0;
}
send->s_wr.send_flags = IB_SEND_SIGNALED;
send->s_wr.num_sge = 1;
send->s_wr.next = NULL;
send->s_wr.wr.atomic.remote_addr = op->op_remote_addr;
send->s_wr.wr.atomic.rkey = op->op_rkey;
/* map 8 byte retval buffer to the device */
ret = ib_dma_map_sg(ic->i_cm_id->device, op->op_sg, 1, DMA_FROM_DEVICE);
rdsdebug("ic %p mapping atomic op %p. mapped %d pg\n", ic, op, ret);
if (ret != 1) {
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
rds_ib_stats_inc(s_ib_tx_sg_mapping_failure);
ret = -ENOMEM; /* XXX ? */
goto out;
}
/* Convert our struct scatterlist to struct ib_sge */
send->s_sge[0].addr = ib_sg_dma_address(ic->i_cm_id->device, op->op_sg);
send->s_sge[0].length = ib_sg_dma_len(ic->i_cm_id->device, op->op_sg);
send->s_sge[0].lkey = ic->i_mr->lkey;
rdsdebug("rva %Lx rpa %Lx len %u\n", op->op_remote_addr,
send->s_sge[0].addr, send->s_sge[0].length);
failed_wr = &send->s_wr;
ret = ib_post_send(ic->i_cm_id->qp, &send->s_wr, &failed_wr);
rdsdebug("ic %p send %p (wr %p) ret %d wr %p\n", ic,
send, &send->s_wr, ret, failed_wr);
BUG_ON(failed_wr != &send->s_wr);
if (ret) {
printk(KERN_WARNING "RDS/IB: atomic ib_post_send to %pI4 "
"returned %d\n", &conn->c_faddr, ret);
rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
goto out;
}
if (unlikely(failed_wr != &send->s_wr)) {
printk(KERN_WARNING "RDS/IB: atomic ib_post_send() rc=%d, but failed_wqe updated!\n", ret);
BUG_ON(failed_wr != &send->s_wr);
}
out:
return ret;
}
int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op)
{
struct rds_ib_connection *ic = conn->c_transport_data;

73
net/rds/rdma.c
View File

@ -719,3 +719,76 @@ int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
return __rds_rdma_map(rs, CMSG_DATA(cmsg), &rm->m_rdma_cookie, &rm->rdma.m_rdma_mr);
}
/*
* Fill in rds_message for an atomic request.
*/
int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg)
{
struct page *page = NULL;
struct rds_atomic_args *args;
int ret = 0;
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct rds_atomic_args))
|| rm->atomic.op_active)
return -EINVAL;
args = CMSG_DATA(cmsg);
if (cmsg->cmsg_type == RDS_CMSG_ATOMIC_CSWP) {
rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
rm->atomic.op_swap_add = args->cswp.swap;
rm->atomic.op_compare = args->cswp.compare;
} else {
rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
rm->atomic.op_swap_add = args->fadd.add;
}
rm->m_rdma_cookie = args->cookie;
rm->atomic.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);
rm->atomic.op_recverr = rs->rs_recverr;
rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1);
/* verify 8 byte-aligned */
if (args->local_addr & 0x7) {
ret = -EFAULT;
goto err;
}
ret = rds_pin_pages(args->local_addr, 1, &page, 1);
if (ret != 1)
goto err;
ret = 0;
sg_set_page(rm->atomic.op_sg, page, 8, offset_in_page(args->local_addr));
if (rm->atomic.op_notify || rm->atomic.op_recverr) {
/* We allocate an uninitialized notifier here, because
* we don't want to do that in the completion handler. We
* would have to use GFP_ATOMIC there, and don't want to deal
* with failed allocations.
*/
rm->atomic.op_notifier = kmalloc(sizeof(*rm->atomic.op_notifier), GFP_KERNEL);
if (!rm->atomic.op_notifier) {
ret = -ENOMEM;
goto err;
}
rm->atomic.op_notifier->n_user_token = args->user_token;
rm->atomic.op_notifier->n_status = RDS_RDMA_SUCCESS;
}
rm->atomic.op_rkey = rds_rdma_cookie_key(rm->m_rdma_cookie);
rm->atomic.op_remote_addr = args->remote_addr + rds_rdma_cookie_offset(args->cookie);
rm->atomic.op_active = 1;
return ret;
err:
if (page)
put_page(page);
kfree(rm->atomic.op_notifier);
return ret;
}

33
net/rds/rds.h
View File

@ -97,6 +97,7 @@ struct rds_connection {
unsigned int c_xmit_hdr_off;
unsigned int c_xmit_data_off;
unsigned int c_xmit_rdma_sent;
unsigned int c_xmit_atomic_sent;
spinlock_t c_lock; /* protect msg queues */
u64 c_next_tx_seq;
@ -260,6 +261,10 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
return cookie >> 32;
}
/* atomic operation types */
#define RDS_ATOMIC_TYPE_CSWP 0
#define RDS_ATOMIC_TYPE_FADD 1
/*
* m_sock_item and m_conn_item are on lists that are serialized under
* conn->c_lock. m_sock_item has additional meaning in that once it is empty
@ -315,11 +320,27 @@ struct rds_message {
struct rds_sock *m_rs;
rds_rdma_cookie_t m_rdma_cookie;
struct {
struct {
struct rm_atomic_op {
int op_type;
uint64_t op_swap_add;
uint64_t op_compare;
u32 op_rkey;
u64 op_remote_addr;
unsigned int op_notify:1;
unsigned int op_recverr:1;
unsigned int op_mapped:1;
unsigned int op_active:1;
struct rds_notifier *op_notifier;
struct scatterlist *op_sg;
struct rds_mr *op_rdma_mr;
} atomic;
struct rm_rdma_op {
struct rds_rdma_op m_rdma_op;
struct rds_mr *m_rdma_mr;
} rdma;
struct {
struct rm_data_op {
unsigned int m_nents;
unsigned int m_count;
struct scatterlist *m_sg;
@ -397,6 +418,7 @@ struct rds_transport {
int (*xmit_cong_map)(struct rds_connection *conn,
struct rds_cong_map *map, unsigned long offset);
int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op);
int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
int (*recv)(struct rds_connection *conn);
int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
size_t size);
@ -546,6 +568,8 @@ struct rds_statistics {
uint64_t s_cong_update_received;
uint64_t s_cong_send_error;
uint64_t s_cong_send_blocked;
uint64_t s_atomic_cswp;
uint64_t s_atomic_fadd;
};
/* af_rds.c */
@ -722,7 +746,10 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
void rds_rdma_free_op(struct rds_rdma_op *ro);
void rds_rdma_send_complete(struct rds_message *rm, int);
void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
extern void __rds_put_mr_final(struct rds_mr *mr);
static inline void rds_mr_put(struct rds_mr *mr)

67
net/rds/send.c
View File

@ -73,6 +73,7 @@ void rds_send_reset(struct rds_connection *conn)
conn->c_xmit_hdr_off = 0;
conn->c_xmit_data_off = 0;
conn->c_xmit_rdma_sent = 0;
conn->c_xmit_atomic_sent = 0;
conn->c_map_queued = 0;
@ -171,6 +172,7 @@ int rds_send_xmit(struct rds_connection *conn)
conn->c_xmit_hdr_off = 0;
conn->c_xmit_data_off = 0;
conn->c_xmit_rdma_sent = 0;
conn->c_xmit_atomic_sent = 0;
/* Release the reference to the previous message. */
rds_message_put(rm);
@ -262,6 +264,17 @@ int rds_send_xmit(struct rds_connection *conn)
conn->c_xmit_rm = rm;
}
if (rm->atomic.op_active && !conn->c_xmit_atomic_sent) {
ret = conn->c_trans->xmit_atomic(conn, &rm->atomic);
if (ret)
break;
conn->c_xmit_atomic_sent = 1;
/* The transport owns the mapped memory for now.
* You can't unmap it while it's on the send queue */
set_bit(RDS_MSG_MAPPED, &rm->m_flags);
}
/*
* Try and send an rdma message. Let's see if we can
* keep this simple and require that the transport either
@ -442,6 +455,41 @@ void rds_rdma_send_complete(struct rds_message *rm, int status)
}
EXPORT_SYMBOL_GPL(rds_rdma_send_complete);
/*
* Just like above, except looks at atomic op
*/
void rds_atomic_send_complete(struct rds_message *rm, int status)
{
struct rds_sock *rs = NULL;
struct rm_atomic_op *ao;
struct rds_notifier *notifier;
spin_lock(&rm->m_rs_lock);
ao = &rm->atomic;
if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags)
&& ao->op_active && ao->op_notify && ao->op_notifier) {
notifier = ao->op_notifier;
rs = rm->m_rs;
sock_hold(rds_rs_to_sk(rs));
notifier->n_status = status;
spin_lock(&rs->rs_lock);
list_add_tail(&notifier->n_list, &rs->rs_notify_queue);
spin_unlock(&rs->rs_lock);
ao->op_notifier = NULL;
}
spin_unlock(&rm->m_rs_lock);
if (rs) {
rds_wake_sk_sleep(rs);
sock_put(rds_rs_to_sk(rs));
}
}
EXPORT_SYMBOL_GPL(rds_atomic_send_complete);
/*
* This is the same as rds_rdma_send_complete except we
* don't do any locking - we have all the ingredients (message,
@ -788,6 +836,11 @@ static int rds_rm_size(struct msghdr *msg, int data_len)
/* these are valid but do no add any size */
break;
case RDS_CMSG_ATOMIC_CSWP:
case RDS_CMSG_ATOMIC_FADD:
size += sizeof(struct scatterlist);
break;
default:
return -EINVAL;
}
@ -813,7 +866,7 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
continue;
/* As a side effect, RDMA_DEST and RDMA_MAP will set
* rm->m_rdma_cookie and rm->m_rdma_mr.
* rm->rdma.m_rdma_cookie and rm->rdma.m_rdma_mr.
*/
switch (cmsg->cmsg_type) {
case RDS_CMSG_RDMA_ARGS:
@ -829,6 +882,10 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
if (!ret)
*allocated_mr = 1;
break;
case RDS_CMSG_ATOMIC_CSWP:
case RDS_CMSG_ATOMIC_FADD:
ret = rds_cmsg_atomic(rs, rm, cmsg);
break;
default:
return -EINVAL;
@ -934,6 +991,14 @@ int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
goto out;
}
if (rm->atomic.op_active && !conn->c_trans->xmit_atomic) {
if (printk_ratelimit())
printk(KERN_NOTICE "atomic_op %p conn xmit_atomic %p\n",
&rm->atomic, conn->c_trans->xmit_atomic);
ret = -EOPNOTSUPP;
goto out;
}
/* If the connection is down, trigger a connect. We may
* have scheduled a delayed reconnect however - in this case
* we should not interfere.

2
net/rds/stats.c
View File

@ -75,6 +75,8 @@ static const char *const rds_stat_names[] = {
"cong_update_received",
"cong_send_error",
"cong_send_blocked",
"s_atomic_cswp",
"s_atomic_fadd",
};
void rds_stats_info_copy(struct rds_info_iterator *iter,