[ofa-general] [PATCH/RFC] IB/mlx4: Handle new FW requirement for send request prefetching
Roland Dreier
rdreier at cisco.com
Wed Jun 13 10:29:07 PDT 2007
I just queued this patch to handle new FW up. Please let me know if
it looks OK to you, and I will ask Linus to pull it.
Thanks.
commit f22332295cb218ad12db2b521a34553ff5790c34
Author: Roland Dreier <rolandd at cisco.com>
Date: Wed Jun 13 10:26:43 2007 -0700
IB/mlx4: Handle new FW requirement for send request prefetching
New ConnectX firmware introduces FW command interface revision 2,
which requires that for each QP, a chunk of send queue entries (the
"headroom") is kept marked as invalid, so that the HCA doesn't get
confused if it prefetches entries that haven't been posted yet. Add
code to the driver to do this, and also update the user ABI so that
userspace can request that the prefetcher be turned off for userspace
QPs (we just leave the prefetcher on for all kernel QPs).
Marking send queue entries this way is OK for older firmware too, so
we change the driver to allow FW command interface revisions 1 and 2.
Based on a patch from Jack Morgenstein <jackm at dev.mellanox.co.il>.
Signed-off-by: Roland Dreier <rolandd at cisco.com>
diff --git a/drivers/infiniband/hw/mlx4/cq.c b/drivers/infiniband/hw/mlx4/cq.c
index 048c527..e940521 100644
--- a/drivers/infiniband/hw/mlx4/cq.c
+++ b/drivers/infiniband/hw/mlx4/cq.c
@@ -355,7 +355,7 @@ static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
wq = &(*cur_qp)->sq;
wqe_ctr = be16_to_cpu(cqe->wqe_index);
wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
- wc->wr_id = wq->wrid[wq->tail & (wq->max - 1)];
+ wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
++wq->tail;
} else if ((*cur_qp)->ibqp.srq) {
srq = to_msrq((*cur_qp)->ibqp.srq);
@@ -364,7 +364,7 @@ static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
mlx4_ib_free_srq_wqe(srq, wqe_ctr);
} else {
wq = &(*cur_qp)->rq;
- wc->wr_id = wq->wrid[wq->tail & (wq->max - 1)];
+ wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
++wq->tail;
}
diff --git a/drivers/infiniband/hw/mlx4/mlx4_ib.h b/drivers/infiniband/hw/mlx4/mlx4_ib.h
index 93dac71..24ccadd 100644
--- a/drivers/infiniband/hw/mlx4/mlx4_ib.h
+++ b/drivers/infiniband/hw/mlx4/mlx4_ib.h
@@ -95,7 +95,8 @@ struct mlx4_ib_mr {
struct mlx4_ib_wq {
u64 *wrid;
spinlock_t lock;
- int max;
+ int wqe_cnt;
+ int max_post;
int max_gs;
int offset;
int wqe_shift;
@@ -113,6 +114,7 @@ struct mlx4_ib_qp {
u32 doorbell_qpn;
__be32 sq_signal_bits;
+ int sq_spare_wqes;
struct mlx4_ib_wq sq;
struct ib_umem *umem;
@@ -123,6 +125,7 @@ struct mlx4_ib_qp {
u8 alt_port;
u8 atomic_rd_en;
u8 resp_depth;
+ u8 sq_no_prefetch;
u8 state;
};
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 4c15fa3..8fabe0d 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -109,6 +109,20 @@ static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
}
+/*
+ * Stamp a SQ WQE so that it is invalid if prefetched by marking the
+ * first four bytes of every 64 byte chunk with 0xffffffff, except for
+ * the very first chunk of the WQE.
+ */
+static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n)
+{
+ u32 *wqe = get_send_wqe(qp, n);
+ int i;
+
+ for (i = 16; i < 1 << (qp->sq.wqe_shift - 2); i += 16)
+ wqe[i] = 0xffffffff;
+}
+
static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
{
struct ib_event event;
@@ -201,18 +215,18 @@ static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
if (cap->max_recv_wr)
return -EINVAL;
- qp->rq.max = qp->rq.max_gs = 0;
+ qp->rq.wqe_cnt = qp->rq.max_gs = 0;
} else {
/* HW requires >= 1 RQ entry with >= 1 gather entry */
if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
return -EINVAL;
- qp->rq.max = roundup_pow_of_two(max(1U, cap->max_recv_wr));
+ qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr));
qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge));
qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
}
- cap->max_recv_wr = qp->rq.max;
+ cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt;
cap->max_recv_sge = qp->rq.max_gs;
return 0;
@@ -236,8 +250,6 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
return -EINVAL;
- qp->sq.max = cap->max_send_wr ? roundup_pow_of_two(cap->max_send_wr) : 1;
-
qp->sq.wqe_shift = ilog2(roundup_pow_of_two(max(cap->max_send_sge *
sizeof (struct mlx4_wqe_data_seg),
cap->max_inline_data +
@@ -246,18 +258,25 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
qp->sq.max_gs = ((1 << qp->sq.wqe_shift) - send_wqe_overhead(type)) /
sizeof (struct mlx4_wqe_data_seg);
- qp->buf_size = (qp->rq.max << qp->rq.wqe_shift) +
- (qp->sq.max << qp->sq.wqe_shift);
+ /*
+ * We need to leave 2 KB + 1 WQE of headroom in the SQ to
+ * allow HW to prefetch.
+ */
+ qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + 1;
+ qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr + qp->sq_spare_wqes);
+
+ qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
+ (qp->sq.wqe_cnt << qp->sq.wqe_shift);
if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
qp->rq.offset = 0;
- qp->sq.offset = qp->rq.max << qp->rq.wqe_shift;
+ qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
} else {
- qp->rq.offset = qp->sq.max << qp->sq.wqe_shift;
+ qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
qp->sq.offset = 0;
}
- cap->max_send_wr = qp->sq.max;
- cap->max_send_sge = qp->sq.max_gs;
+ cap->max_send_wr = qp->sq.max_post = qp->sq.wqe_cnt - qp->sq_spare_wqes;
+ cap->max_send_sge = qp->sq.max_gs;
cap->max_inline_data = (1 << qp->sq.wqe_shift) - send_wqe_overhead(type) -
sizeof (struct mlx4_wqe_inline_seg);
@@ -267,11 +286,11 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
static int set_user_sq_size(struct mlx4_ib_qp *qp,
struct mlx4_ib_create_qp *ucmd)
{
- qp->sq.max = 1 << ucmd->log_sq_bb_count;
+ qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count;
qp->sq.wqe_shift = ucmd->log_sq_stride;
- qp->buf_size = (qp->rq.max << qp->rq.wqe_shift) +
- (qp->sq.max << qp->sq.wqe_shift);
+ qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
+ (qp->sq.wqe_cnt << qp->sq.wqe_shift);
return 0;
}
@@ -307,6 +326,8 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
goto err;
}
+ qp->sq_no_prefetch = ucmd.sq_no_prefetch;
+
err = set_user_sq_size(qp, &ucmd);
if (err)
goto err;
@@ -334,6 +355,8 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
goto err_mtt;
}
} else {
+ qp->sq_no_prefetch = 0;
+
err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
if (err)
goto err;
@@ -360,8 +383,8 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
if (err)
goto err_mtt;
- qp->sq.wrid = kmalloc(qp->sq.max * sizeof (u64), GFP_KERNEL);
- qp->rq.wrid = kmalloc(qp->rq.max * sizeof (u64), GFP_KERNEL);
+ qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
+ qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
if (!qp->sq.wrid || !qp->rq.wrid) {
err = -ENOMEM;
@@ -743,14 +766,17 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
context->mtu_msgmax = (attr->path_mtu << 5) | 31;
}
- if (qp->rq.max)
- context->rq_size_stride = ilog2(qp->rq.max) << 3;
+ if (qp->rq.wqe_cnt)
+ context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
context->rq_size_stride |= qp->rq.wqe_shift - 4;
- if (qp->sq.max)
- context->sq_size_stride = ilog2(qp->sq.max) << 3;
+ if (qp->sq.wqe_cnt)
+ context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
context->sq_size_stride |= qp->sq.wqe_shift - 4;
+ if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
+ context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
+
if (qp->ibqp.uobject)
context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
else
@@ -884,16 +910,19 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
/*
* Before passing a kernel QP to the HW, make sure that the
- * ownership bits of the send queue are set so that the
- * hardware doesn't start processing stale work requests.
+ * ownership bits of the send queue are set and the SQ
+ * headroom is stamped so that the hardware doesn't start
+ * processing stale work requests.
*/
if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
struct mlx4_wqe_ctrl_seg *ctrl;
int i;
- for (i = 0; i < qp->sq.max; ++i) {
+ for (i = 0; i < qp->sq.wqe_cnt; ++i) {
ctrl = get_send_wqe(qp, i);
ctrl->owner_opcode = cpu_to_be32(1 << 31);
+
+ stamp_send_wqe(qp, i);
}
}
@@ -1124,7 +1153,7 @@ static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq
struct mlx4_ib_cq *cq;
cur = wq->head - wq->tail;
- if (likely(cur + nreq < wq->max))
+ if (likely(cur + nreq < wq->max_post))
return 0;
cq = to_mcq(ib_cq);
@@ -1132,7 +1161,7 @@ static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq
cur = wq->head - wq->tail;
spin_unlock(&cq->lock);
- return cur + nreq >= wq->max;
+ return cur + nreq >= wq->max_post;
}
int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
@@ -1165,8 +1194,8 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
goto out;
}
- ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.max - 1));
- qp->sq.wrid[ind & (qp->sq.max - 1)] = wr->wr_id;
+ ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
+ qp->sq.wrid[ind & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
ctrl->srcrb_flags =
(wr->send_flags & IB_SEND_SIGNALED ?
@@ -1301,7 +1330,16 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
}
ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
- (ind & qp->sq.max ? cpu_to_be32(1 << 31) : 0);
+ (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);
+
+ /*
+ * We can improve latency by not stamping the last
+ * send queue WQE until after ringing the doorbell, so
+ * only stamp here if there are still more WQEs to post.
+ */
+ if (wr->next)
+ stamp_send_wqe(qp, (ind + qp->sq_spare_wqes) &
+ (qp->sq.wqe_cnt - 1));
++ind;
}
@@ -1324,6 +1362,9 @@ out:
* and reach the HCA out of order.
*/
mmiowb();
+
+ stamp_send_wqe(qp, (ind + qp->sq_spare_wqes - 1) &
+ (qp->sq.wqe_cnt - 1));
}
spin_unlock_irqrestore(&qp->rq.lock, flags);
@@ -1344,7 +1385,7 @@ int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
spin_lock_irqsave(&qp->rq.lock, flags);
- ind = qp->rq.head & (qp->rq.max - 1);
+ ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
for (nreq = 0; wr; ++nreq, wr = wr->next) {
if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.send_cq)) {
@@ -1375,7 +1416,7 @@ int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
qp->rq.wrid[ind] = wr->wr_id;
- ind = (ind + 1) & (qp->rq.max - 1);
+ ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
}
out:
diff --git a/drivers/infiniband/hw/mlx4/user.h b/drivers/infiniband/hw/mlx4/user.h
index 88c72d5..e2d11be 100644
--- a/drivers/infiniband/hw/mlx4/user.h
+++ b/drivers/infiniband/hw/mlx4/user.h
@@ -39,7 +39,7 @@
* Increment this value if any changes that break userspace ABI
* compatibility are made.
*/
-#define MLX4_IB_UVERBS_ABI_VERSION 2
+#define MLX4_IB_UVERBS_ABI_VERSION 3
/*
* Make sure that all structs defined in this file remain laid out so
@@ -87,9 +87,10 @@ struct mlx4_ib_create_srq_resp {
struct mlx4_ib_create_qp {
__u64 buf_addr;
__u64 db_addr;
- __u8 log_sq_bb_count;
- __u8 log_sq_stride;
- __u8 reserved[6];
+ __u8 log_sq_bb_count;
+ __u8 log_sq_stride;
+ __u8 sq_no_prefetch;
+ __u8 reserved[5];
};
#endif /* MLX4_IB_USER_H */
diff --git a/drivers/net/mlx4/fw.c b/drivers/net/mlx4/fw.c
index e7ca118..1a7e52d 100644
--- a/drivers/net/mlx4/fw.c
+++ b/drivers/net/mlx4/fw.c
@@ -38,7 +38,8 @@
#include "icm.h"
enum {
- MLX4_COMMAND_INTERFACE_REV = 1
+ MLX4_COMMAND_INTERFACE_MIN_REV = 1,
+ MLX4_COMMAND_INTERFACE_MAX_REV = 2,
};
extern void __buggy_use_of_MLX4_GET(void);
@@ -491,7 +492,8 @@ int mlx4_QUERY_FW(struct mlx4_dev *dev)
((fw_ver & 0x0000ffffull) << 16);
MLX4_GET(cmd_if_rev, outbox, QUERY_FW_CMD_IF_REV_OFFSET);
- if (cmd_if_rev != MLX4_COMMAND_INTERFACE_REV) {
+ if (cmd_if_rev < MLX4_COMMAND_INTERFACE_MIN_REV ||
+ cmd_if_rev > MLX4_COMMAND_INTERFACE_MAX_REV) {
mlx4_err(dev, "Installed FW has unsupported "
"command interface revision %d.\n",
cmd_if_rev);
@@ -499,8 +501,8 @@ int mlx4_QUERY_FW(struct mlx4_dev *dev)
(int) (dev->caps.fw_ver >> 32),
(int) (dev->caps.fw_ver >> 16) & 0xffff,
(int) dev->caps.fw_ver & 0xffff);
- mlx4_err(dev, "This driver version supports only revision %d.\n",
- MLX4_COMMAND_INTERFACE_REV);
+ mlx4_err(dev, "This driver version supports only revisions %d to %d.\n",
+ MLX4_COMMAND_INTERFACE_MIN_REV, MLX4_COMMAND_INTERFACE_MAX_REV);
err = -ENODEV;
goto out;
}
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