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RDS: Implement masked atomic operations 

Add two CMSGs for masked versions of cswp and fadd. args
struct modified to use a union for different atomic op type's
arguments. Change IB to do masked atomic ops. Atomic op type
in rds_message similarly unionized.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
This commit is contained in:
Andy Grover 2010-08-25 05:51:28 -07:00
parent 59f740a6ae
commit 20c72bd5f5
5 changed files with 64 additions and 13 deletions
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12
include/linux/rds.h
View File

@ -75,6 +75,8 @@
#define RDS_CMSG_CONG_UPDATE 5
#define RDS_CMSG_ATOMIC_FADD 6
#define RDS_CMSG_ATOMIC_CSWP 7
#define RDS_CMSG_MASKED_ATOMIC_FADD 8
#define RDS_CMSG_MASKED_ATOMIC_CSWP 9
#define RDS_INFO_FIRST 10000
#define RDS_INFO_COUNTERS 10000
@ -251,6 +253,16 @@ struct rds_atomic_args {
struct {
uint64_t add;
} fadd;
struct {
uint64_t compare;
uint64_t swap;
uint64_t compare_mask;
uint64_t swap_mask;
} m_cswp;
struct {
uint64_t add;
uint64_t nocarry_mask;
} m_fadd;
};
uint64_t flags;
uint64_t user_token;

14
net/rds/ib_send.c
View File

@ -807,13 +807,17 @@ int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op)
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;
send->s_wr.opcode = IB_WR_MASKED_ATOMIC_CMP_AND_SWP;
send->s_wr.wr.atomic.compare_add = op->op_m_cswp.compare;
send->s_wr.wr.atomic.swap = op->op_m_cswp.swap;
send->s_wr.wr.atomic.compare_add_mask = op->op_m_cswp.compare_mask;
send->s_wr.wr.atomic.swap_mask = op->op_m_cswp.swap_mask;
} 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.opcode = IB_WR_MASKED_ATOMIC_FETCH_AND_ADD;
send->s_wr.wr.atomic.compare_add = op->op_m_fadd.add;
send->s_wr.wr.atomic.swap = 0;
send->s_wr.wr.atomic.compare_add_mask = op->op_m_fadd.nocarry_mask;
send->s_wr.wr.atomic.swap_mask = 0;
}
nr_sig = rds_ib_set_wr_signal_state(ic, send, op->op_notify);
send->s_wr.num_sge = 1;

33
net/rds/rdma.c
View File

@ -738,13 +738,34 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
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 {
/* Nonmasked & masked cmsg ops converted to masked hw ops */
switch (cmsg->cmsg_type) {
case RDS_CMSG_ATOMIC_FADD:
rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
rm->atomic.op_swap_add = args->fadd.add;
rm->atomic.op_m_fadd.add = args->fadd.add;
rm->atomic.op_m_fadd.nocarry_mask = 0;
break;
case RDS_CMSG_MASKED_ATOMIC_FADD:
rm->atomic.op_type = RDS_ATOMIC_TYPE_FADD;
rm->atomic.op_m_fadd.add = args->m_fadd.add;
rm->atomic.op_m_fadd.nocarry_mask = args->m_fadd.nocarry_mask;
break;
case RDS_CMSG_ATOMIC_CSWP:
rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
rm->atomic.op_m_cswp.compare = args->cswp.compare;
rm->atomic.op_m_cswp.swap = args->cswp.swap;
rm->atomic.op_m_cswp.compare_mask = ~0;
rm->atomic.op_m_cswp.swap_mask = ~0;
break;
case RDS_CMSG_MASKED_ATOMIC_CSWP:
rm->atomic.op_type = RDS_ATOMIC_TYPE_CSWP;
rm->atomic.op_m_cswp.compare = args->m_cswp.compare;
rm->atomic.op_m_cswp.swap = args->m_cswp.swap;
rm->atomic.op_m_cswp.compare_mask = args->m_cswp.compare_mask;
rm->atomic.op_m_cswp.swap_mask = args->m_cswp.swap_mask;
break;
default:
BUG(); /* should never happen */
}
rm->atomic.op_notify = !!(args->flags & RDS_RDMA_NOTIFY_ME);

14
net/rds/rds.h
View File

@ -316,8 +316,18 @@ struct rds_message {
struct {
struct rm_atomic_op {
int op_type;
uint64_t op_swap_add;
uint64_t op_compare;
union {
struct {
uint64_t compare;
uint64_t swap;
uint64_t compare_mask;
uint64_t swap_mask;
} op_m_cswp;
struct {
uint64_t add;
uint64_t nocarry_mask;
} op_m_fadd;
};
u32 op_rkey;
u64 op_remote_addr;

4
net/rds/send.c
View File

@ -843,6 +843,8 @@ static int rds_rm_size(struct msghdr *msg, int data_len)
case RDS_CMSG_ATOMIC_CSWP:
case RDS_CMSG_ATOMIC_FADD:
case RDS_CMSG_MASKED_ATOMIC_CSWP:
case RDS_CMSG_MASKED_ATOMIC_FADD:
cmsg_groups |= 1;
size += sizeof(struct scatterlist);
break;
@ -894,6 +896,8 @@ static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
break;
case RDS_CMSG_ATOMIC_CSWP:
case RDS_CMSG_ATOMIC_FADD:
case RDS_CMSG_MASKED_ATOMIC_CSWP:
case RDS_CMSG_MASKED_ATOMIC_FADD:
ret = rds_cmsg_atomic(rs, rm, cmsg);
break;