* [PATCH for-next 3/4] RDMA/erdma: Support non-sleeping erdma_post_cmd_wait()
2024-12-26 8:41 [PATCH for-next 0/4] RDMA/erdma: Misc fixes for the erdma RoCEv2 protocol Boshi Yu
2024-12-26 8:41 ` [PATCH for-next 1/4] RDMA/erdma: Add missing fields to the erdma_device_ops_rocev2 Boshi Yu
2024-12-26 8:41 ` [PATCH for-next 2/4] RDMA/erdma: Fix incorrect response returned from query_qp Boshi Yu
@ 2024-12-26 8:41 ` Boshi Yu
2024-12-26 8:41 ` [PATCH for-next 4/4] RDMA/erdma: Support create_ah/destroy_ah in non-sleepable contexts Boshi Yu
2024-12-30 18:43 ` [PATCH for-next 0/4] RDMA/erdma: Misc fixes for the erdma RoCEv2 protocol Leon Romanovsky
4 siblings, 0 replies; 6+ messages in thread
From: Boshi Yu @ 2024-12-26 8:41 UTC (permalink / raw)
To: jgg, leon; +Cc: linux-rdma, kaishen, chengyou
Several scenarios require posting commands to the cmdq in a non-sleepable
context. For example, the cm_alloc_msg() might call erdma_create_ah()
while still holding a spinlock. So we add support for non-sleeping
erdma_post_cmd_wait().
Reviewed-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Boshi Yu <boshiyu@linux.alibaba.com>
---
drivers/infiniband/hw/erdma/erdma.h | 4 +--
drivers/infiniband/hw/erdma/erdma_cmdq.c | 26 +++++++-------
drivers/infiniband/hw/erdma/erdma_eq.c | 6 ++--
drivers/infiniband/hw/erdma/erdma_main.c | 7 ++--
drivers/infiniband/hw/erdma/erdma_qp.c | 8 +++--
drivers/infiniband/hw/erdma/erdma_verbs.c | 44 ++++++++++++++---------
6 files changed, 54 insertions(+), 41 deletions(-)
diff --git a/drivers/infiniband/hw/erdma/erdma.h b/drivers/infiniband/hw/erdma/erdma.h
index 4f840d8e3beb..f7ed1e4cff99 100644
--- a/drivers/infiniband/hw/erdma/erdma.h
+++ b/drivers/infiniband/hw/erdma/erdma.h
@@ -101,8 +101,6 @@ struct erdma_cmdq {
struct erdma_comp_wait *wait_pool;
spinlock_t lock;
- bool use_event;
-
struct erdma_cmdq_sq sq;
struct erdma_cmdq_cq cq;
struct erdma_eq eq;
@@ -269,7 +267,7 @@ void erdma_cmdq_destroy(struct erdma_dev *dev);
void erdma_cmdq_build_reqhdr(u64 *hdr, u32 mod, u32 op);
int erdma_post_cmd_wait(struct erdma_cmdq *cmdq, void *req, u32 req_size,
- u64 *resp0, u64 *resp1);
+ u64 *resp0, u64 *resp1, bool sleepable);
void erdma_cmdq_completion_handler(struct erdma_cmdq *cmdq);
int erdma_ceqs_init(struct erdma_dev *dev);
diff --git a/drivers/infiniband/hw/erdma/erdma_cmdq.c b/drivers/infiniband/hw/erdma/erdma_cmdq.c
index a3d8922d1ad1..b867aefe83b2 100644
--- a/drivers/infiniband/hw/erdma/erdma_cmdq.c
+++ b/drivers/infiniband/hw/erdma/erdma_cmdq.c
@@ -182,7 +182,6 @@ int erdma_cmdq_init(struct erdma_dev *dev)
int err;
cmdq->max_outstandings = ERDMA_CMDQ_MAX_OUTSTANDING;
- cmdq->use_event = false;
sema_init(&cmdq->credits, cmdq->max_outstandings);
@@ -223,8 +222,6 @@ int erdma_cmdq_init(struct erdma_dev *dev)
void erdma_finish_cmdq_init(struct erdma_dev *dev)
{
- /* after device init successfully, change cmdq to event mode. */
- dev->cmdq.use_event = true;
arm_cmdq_cq(&dev->cmdq);
}
@@ -312,8 +309,7 @@ static int erdma_poll_single_cmd_completion(struct erdma_cmdq *cmdq)
/* Copy 16B comp data after cqe hdr to outer */
be32_to_cpu_array(comp_wait->comp_data, cqe + 2, 4);
- if (cmdq->use_event)
- complete(&comp_wait->wait_event);
+ complete(&comp_wait->wait_event);
return 0;
}
@@ -332,9 +328,6 @@ static void erdma_polling_cmd_completions(struct erdma_cmdq *cmdq)
if (erdma_poll_single_cmd_completion(cmdq))
break;
- if (comp_num && cmdq->use_event)
- arm_cmdq_cq(cmdq);
-
spin_unlock_irqrestore(&cmdq->cq.lock, flags);
}
@@ -342,8 +335,7 @@ void erdma_cmdq_completion_handler(struct erdma_cmdq *cmdq)
{
int got_event = 0;
- if (!test_bit(ERDMA_CMDQ_STATE_OK_BIT, &cmdq->state) ||
- !cmdq->use_event)
+ if (!test_bit(ERDMA_CMDQ_STATE_OK_BIT, &cmdq->state))
return;
while (get_next_valid_eqe(&cmdq->eq)) {
@@ -354,6 +346,7 @@ void erdma_cmdq_completion_handler(struct erdma_cmdq *cmdq)
if (got_event) {
cmdq->cq.cmdsn++;
erdma_polling_cmd_completions(cmdq);
+ arm_cmdq_cq(cmdq);
}
notify_eq(&cmdq->eq);
@@ -372,7 +365,7 @@ static int erdma_poll_cmd_completion(struct erdma_comp_wait *comp_ctx,
if (time_is_before_jiffies(comp_timeout))
return -ETIME;
- msleep(20);
+ udelay(20);
}
return 0;
@@ -403,7 +396,7 @@ void erdma_cmdq_build_reqhdr(u64 *hdr, u32 mod, u32 op)
}
int erdma_post_cmd_wait(struct erdma_cmdq *cmdq, void *req, u32 req_size,
- u64 *resp0, u64 *resp1)
+ u64 *resp0, u64 *resp1, bool sleepable)
{
struct erdma_comp_wait *comp_wait;
int ret;
@@ -411,7 +404,12 @@ int erdma_post_cmd_wait(struct erdma_cmdq *cmdq, void *req, u32 req_size,
if (!test_bit(ERDMA_CMDQ_STATE_OK_BIT, &cmdq->state))
return -ENODEV;
- down(&cmdq->credits);
+ if (!sleepable) {
+ while (down_trylock(&cmdq->credits))
+ ;
+ } else {
+ down(&cmdq->credits);
+ }
comp_wait = get_comp_wait(cmdq);
if (IS_ERR(comp_wait)) {
@@ -425,7 +423,7 @@ int erdma_post_cmd_wait(struct erdma_cmdq *cmdq, void *req, u32 req_size,
push_cmdq_sqe(cmdq, req, req_size, comp_wait);
spin_unlock(&cmdq->sq.lock);
- if (cmdq->use_event)
+ if (sleepable)
ret = erdma_wait_cmd_completion(comp_wait, cmdq,
ERDMA_CMDQ_TIMEOUT_MS);
else
diff --git a/drivers/infiniband/hw/erdma/erdma_eq.c b/drivers/infiniband/hw/erdma/erdma_eq.c
index 9a72fec6d5cc..6486234a2360 100644
--- a/drivers/infiniband/hw/erdma/erdma_eq.c
+++ b/drivers/infiniband/hw/erdma/erdma_eq.c
@@ -236,7 +236,8 @@ static int create_eq_cmd(struct erdma_dev *dev, u32 eqn, struct erdma_eq *eq)
req.db_dma_addr_l = lower_32_bits(eq->dbrec_dma);
req.db_dma_addr_h = upper_32_bits(eq->dbrec_dma);
- return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ false);
}
static int erdma_ceq_init_one(struct erdma_dev *dev, u16 ceqn)
@@ -278,7 +279,8 @@ static void erdma_ceq_uninit_one(struct erdma_dev *dev, u16 ceqn)
req.qtype = ERDMA_EQ_TYPE_CEQ;
req.vector_idx = ceqn + 1;
- err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ false);
if (err)
return;
diff --git a/drivers/infiniband/hw/erdma/erdma_main.c b/drivers/infiniband/hw/erdma/erdma_main.c
index 29505bc11168..eef3dca48784 100644
--- a/drivers/infiniband/hw/erdma/erdma_main.c
+++ b/drivers/infiniband/hw/erdma/erdma_main.c
@@ -392,7 +392,7 @@ static int erdma_dev_attrs_init(struct erdma_dev *dev)
CMDQ_OPCODE_QUERY_DEVICE);
err = erdma_post_cmd_wait(&dev->cmdq, &req_hdr, sizeof(req_hdr), &cap0,
- &cap1);
+ &cap1, true);
if (err)
return err;
@@ -425,7 +425,7 @@ static int erdma_dev_attrs_init(struct erdma_dev *dev)
CMDQ_OPCODE_QUERY_FW_INFO);
err = erdma_post_cmd_wait(&dev->cmdq, &req_hdr, sizeof(req_hdr), &cap0,
- &cap1);
+ &cap1, true);
if (!err)
dev->attrs.fw_version =
FIELD_GET(ERDMA_CMD_INFO0_FW_VER_MASK, cap0);
@@ -446,7 +446,8 @@ static int erdma_device_config(struct erdma_dev *dev)
req.cfg = FIELD_PREP(ERDMA_CMD_CONFIG_DEVICE_PGSHIFT_MASK, PAGE_SHIFT) |
FIELD_PREP(ERDMA_CMD_CONFIG_DEVICE_PS_EN_MASK, 1);
- return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
}
static int erdma_res_cb_init(struct erdma_dev *dev)
diff --git a/drivers/infiniband/hw/erdma/erdma_qp.c b/drivers/infiniband/hw/erdma/erdma_qp.c
index 4dfb4272ad86..7698a141bd90 100644
--- a/drivers/infiniband/hw/erdma/erdma_qp.c
+++ b/drivers/infiniband/hw/erdma/erdma_qp.c
@@ -98,7 +98,8 @@ erdma_modify_qp_state_to_rts(struct erdma_qp *qp,
req.send_nxt += MPA_DEFAULT_HDR_LEN + params->pd_len;
req.recv_nxt = tp->rcv_nxt;
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (ret)
return ret;
@@ -131,7 +132,8 @@ erdma_modify_qp_state_to_stop(struct erdma_qp *qp,
req.cfg = FIELD_PREP(ERDMA_CMD_MODIFY_QP_STATE_MASK, params->state) |
FIELD_PREP(ERDMA_CMD_MODIFY_QP_QPN_MASK, QP_ID(qp));
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (ret)
return ret;
@@ -246,7 +248,7 @@ static int modify_qp_cmd_rocev2(struct erdma_qp *qp,
req.attr_mask = attr_mask;
return erdma_post_cmd_wait(&qp->dev->cmdq, &req, sizeof(req), NULL,
- NULL);
+ NULL, true);
}
static void erdma_reset_qp(struct erdma_qp *qp)
diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index 27e03474e348..73ec59dcf43e 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -126,8 +126,8 @@ static int create_qp_cmd(struct erdma_ucontext *uctx, struct erdma_qp *qp)
}
}
- err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), &resp0,
- &resp1);
+ err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), &resp0, &resp1,
+ true);
if (!err && erdma_device_iwarp(dev))
qp->attrs.iwarp.cookie =
FIELD_GET(ERDMA_CMDQ_CREATE_QP_RESP_COOKIE_MASK, resp0);
@@ -185,7 +185,8 @@ static int regmr_cmd(struct erdma_dev *dev, struct erdma_mr *mr)
}
post_cmd:
- return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
}
static int create_cq_cmd(struct erdma_ucontext *uctx, struct erdma_cq *cq)
@@ -247,7 +248,8 @@ static int create_cq_cmd(struct erdma_ucontext *uctx, struct erdma_cq *cq)
}
}
- return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
}
static int erdma_alloc_idx(struct erdma_resource_cb *res_cb)
@@ -467,7 +469,8 @@ static void erdma_flush_worker(struct work_struct *work)
req.qpn = QP_ID(qp);
req.sq_pi = qp->kern_qp.sq_pi;
req.rq_pi = qp->kern_qp.rq_pi;
- erdma_post_cmd_wait(&qp->dev->cmdq, &req, sizeof(req), NULL, NULL);
+ erdma_post_cmd_wait(&qp->dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
}
static int erdma_qp_validate_cap(struct erdma_dev *dev,
@@ -1265,7 +1268,8 @@ int erdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
req.cfg = FIELD_PREP(ERDMA_CMD_MR_MPT_IDX_MASK, ibmr->lkey >> 8) |
FIELD_PREP(ERDMA_CMD_MR_KEY_MASK, ibmr->lkey & 0xFF);
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (ret)
return ret;
@@ -1290,7 +1294,8 @@ int erdma_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
CMDQ_OPCODE_DESTROY_CQ);
req.cqn = cq->cqn;
- err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (err)
return err;
@@ -1337,7 +1342,8 @@ int erdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
CMDQ_OPCODE_DESTROY_QP);
req.qpn = QP_ID(qp);
- err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (err)
return err;
@@ -1435,7 +1441,8 @@ static int alloc_db_resources(struct erdma_dev *dev, struct erdma_ucontext *ctx,
FIELD_PREP(ERDMA_CMD_EXT_DB_RQ_EN_MASK, 1) |
FIELD_PREP(ERDMA_CMD_EXT_DB_SQ_EN_MASK, 1);
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), &val0, &val1);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), &val0, &val1,
+ true);
if (ret)
return ret;
@@ -1470,7 +1477,8 @@ static void free_db_resources(struct erdma_dev *dev, struct erdma_ucontext *ctx)
req.rdb_off = ctx->ext_db.rdb_off;
req.cdb_off = ctx->ext_db.cdb_off;
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (ret)
ibdev_err_ratelimited(&dev->ibdev,
"free db resources failed %d", ret);
@@ -1834,7 +1842,7 @@ int erdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr,
req.qpn = QP_ID(qp);
ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), &resp0,
- &resp1);
+ &resp1, true);
if (ret)
return ret;
@@ -1997,7 +2005,7 @@ void erdma_set_mtu(struct erdma_dev *dev, u32 mtu)
CMDQ_OPCODE_CONF_MTU);
req.mtu = mtu;
- erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL, true);
}
void erdma_port_event(struct erdma_dev *dev, enum ib_event_type reason)
@@ -2067,7 +2075,8 @@ static int erdma_query_hw_stats(struct erdma_dev *dev,
req.target_addr = dma_addr;
req.target_length = ERDMA_HW_RESP_SIZE;
- err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ err = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (err)
goto out;
@@ -2128,7 +2137,8 @@ static int erdma_set_gid(struct erdma_dev *dev, u8 op, u32 idx,
erdma_cmdq_build_reqhdr(&req.hdr, CMDQ_SUBMOD_RDMA,
CMDQ_OPCODE_SET_GID);
- return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
}
int erdma_add_gid(const struct ib_gid_attr *attr, void **context)
@@ -2212,7 +2222,8 @@ int erdma_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
req.ahn = ah->ahn;
erdma_set_av_cfg(&req.av_cfg, &ah->av);
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (ret) {
erdma_free_idx(&dev->res_cb[ERDMA_RES_TYPE_AH], ah->ahn);
return ret;
@@ -2235,7 +2246,8 @@ int erdma_destroy_ah(struct ib_ah *ibah, u32 flags)
req.pdn = pd->pdn;
req.ahn = ah->ahn;
- ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
+ ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
+ true);
if (ret)
return ret;
--
2.46.0
^ permalink raw reply related [flat|nested] 6+ messages in thread