From: Feng Fang fangfeng4@huawei.com

maillist inclusion commit faa62440a5772b40bb7d78bf9e29556a82ecf153 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IB4OOG

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?id=faa...

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DIP algorithm requires a one-to-one mapping between dgid and dip_idx. Currently a queue 'spare_idx' is used to store QPN of QPs that use DIP algorithm. For a new dgid, use a QPN from spare_idx as dip_idx. This method lacks a mechanism for deduplicating QPN, which may result in different dgids sharing the same dip_idx and break the one-to-one mapping requirement.

This patch replaces spare_idx with xarray and introduces a refcnt of a dip_idx to indicate the number of QPs that using this dip_idx.

The state machine for dip_idx management is implemented as:

* The entry at an index in xarray is empty -- This indicates that the corresponding dip_idx hasn't been created.

* The entry at an index in xarray is not empty but with 0 refcnt -- This indicates that the corresponding dip_idx has been created but not used as dip_idx yet.

* The entry at an index in xarray is not empty and with non-0 refcnt -- This indicates that the corresponding dip_idx is being used by refcnt number of DIP QPs.

Fixes: eb653eda1e91 ("RDMA/hns: Bugfix for incorrect association between dip_idx and dgid") Fixes: f91696f2f053 ("RDMA/hns: Support congestion control type selection according to the FW") Signed-off-by: Feng Fang fangfeng4@huawei.com Signed-off-by: Junxian Huang huangjunxian6@hisilicon.com Link: https://patch.msgid.link/20241112055553.3681129-1-huangjunxian6@hisilicon.co... Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Xinghai Cen cenxinghai@h-partners.com --- drivers/infiniband/hw/hns/hns_roce_device.h | 11 +-- drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 96 +++++++++++++++------ drivers/infiniband/hw/hns/hns_roce_hw_v2.h | 2 +- drivers/infiniband/hw/hns/hns_roce_main.c | 2 - drivers/infiniband/hw/hns/hns_roce_qp.c | 8 +- 5 files changed, 75 insertions(+), 44 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h index fdc1fe5e6a81..e3303cc3584a 100644 --- a/drivers/infiniband/hw/hns/hns_roce_device.h +++ b/drivers/infiniband/hw/hns/hns_roce_device.h @@ -570,12 +570,6 @@ struct hns_roce_bank { u32 next; /* Next ID to allocate. */ };

-struct hns_roce_idx_table { - u32 *spare_idx; - u32 head; - u32 tail; -}; - struct hns_roce_qp_table { struct hns_roce_hem_table qp_table; struct hns_roce_hem_table irrl_table; @@ -584,7 +578,7 @@ struct hns_roce_qp_table { struct mutex scc_mutex; struct hns_roce_bank bank[HNS_ROCE_QP_BANK_NUM]; struct mutex bank_mutex; - struct hns_roce_idx_table idx_table; + struct xarray dip_xa; };

struct hns_roce_cq_table { @@ -742,6 +736,7 @@ struct hns_roce_qp { bool delayed_destroy_flag; struct hns_roce_mtr_node *mtr_node; spinlock_t flush_lock; + struct hns_roce_dip *dip; };

struct hns_roce_ib_iboe { @@ -1102,8 +1097,6 @@ struct hns_roce_dev { enum hns_roce_device_state state; struct list_head qp_list; /* list of all qps on this dev */ spinlock_t qp_list_lock; /* protect qp_list */ - struct list_head dip_list; /* list of all dest ips on this dev */ - spinlock_t dip_list_lock; /* protect dip_list */

struct list_head pgdir_list; struct mutex pgdir_mutex; diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c index 3f254ac48b42..88bd75c5743e 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c @@ -2720,20 +2720,19 @@ static void hns_roce_free_link_table(struct hns_roce_dev *hr_dev) free_link_table_buf(hr_dev, &priv->ext_llm); }

-static void free_dip_list(struct hns_roce_dev *hr_dev) +static void free_dip_entry(struct hns_roce_dev *hr_dev) { struct hns_roce_dip *hr_dip; - struct hns_roce_dip *tmp; - unsigned long flags; + unsigned long idx;

- spin_lock_irqsave(&hr_dev->dip_list_lock, flags); + xa_lock(&hr_dev->qp_table.dip_xa);

- list_for_each_entry_safe(hr_dip, tmp, &hr_dev->dip_list, node) { - list_del(&hr_dip->node); + xa_for_each(&hr_dev->qp_table.dip_xa, idx, hr_dip) { + __xa_erase(&hr_dev->qp_table.dip_xa, hr_dip->dip_idx); kfree(hr_dip); }

- spin_unlock_irqrestore(&hr_dev->dip_list_lock, flags); + xa_unlock(&hr_dev->qp_table.dip_xa); }

static int hns_roce_v2_get_reset_page(struct hns_roce_dev *hr_dev) @@ -3182,7 +3181,7 @@ static void hns_roce_v2_exit(struct hns_roce_dev *hr_dev) hns_roce_v2_put_reset_page(hr_dev);

if (hr_dev->pci_dev->revision == PCI_REVISION_ID_HIP09) - free_dip_list(hr_dev); + free_dip_entry(hr_dev); }

static inline void mbox_desc_init(struct hns_roce_post_mbox *mb, @@ -5042,26 +5041,49 @@ static int modify_qp_rtr_to_rts(struct ib_qp *ibqp, int attr_mask, return 0; }

+static int alloc_dip_entry(struct xarray *dip_xa, u32 qpn) +{ + struct hns_roce_dip *hr_dip; + int ret; + + hr_dip = xa_load(dip_xa, qpn); + if (hr_dip) + return 0; + + hr_dip = kzalloc(sizeof(*hr_dip), GFP_KERNEL); + if (!hr_dip) + return -ENOMEM; + + ret = xa_err(xa_store(dip_xa, qpn, hr_dip, GFP_KERNEL)); + if (ret) + kfree(hr_dip); + + return ret; +} + static int get_dip_ctx_idx(struct ib_qp *ibqp, const struct ib_qp_attr *attr, u32 *dip_idx) { const struct ib_global_route *grh = rdma_ah_read_grh(&attr->ah_attr); struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device); - u32 *spare_idx = hr_dev->qp_table.idx_table.spare_idx; - u32 *head = &hr_dev->qp_table.idx_table.head; - u32 *tail = &hr_dev->qp_table.idx_table.tail; + struct xarray *dip_xa = &hr_dev->qp_table.dip_xa; + struct hns_roce_qp *hr_qp = to_hr_qp(ibqp); struct hns_roce_dip *hr_dip; - unsigned long flags; + unsigned long idx; int ret = 0;

- spin_lock_irqsave(&hr_dev->dip_list_lock, flags); + ret = alloc_dip_entry(dip_xa, ibqp->qp_num); + if (ret) + return ret;

- spare_idx[*tail] = ibqp->qp_num; - *tail = (*tail == hr_dev->caps.num_qps - 1) ? 0 : (*tail + 1); + xa_lock(dip_xa);

- list_for_each_entry(hr_dip, &hr_dev->dip_list, node) { - if (!memcmp(grh->dgid.raw, hr_dip->dgid, GID_LEN_V2)) { + xa_for_each(dip_xa, idx, hr_dip) { + if (hr_dip->qp_cnt && + !memcmp(grh->dgid.raw, hr_dip->dgid, GID_LEN_V2)) { *dip_idx = hr_dip->dip_idx; + hr_dip->qp_cnt++; + hr_qp->dip = hr_dip; goto out; } } @@ -5069,19 +5091,24 @@ static int get_dip_ctx_idx(struct ib_qp *ibqp, const struct ib_qp_attr *attr, /* If no dgid is found, a new dip and a mapping between dgid and * dip_idx will be created. */ - hr_dip = kzalloc(sizeof(*hr_dip), GFP_ATOMIC); - if (!hr_dip) { - ret = -ENOMEM; - goto out; + xa_for_each(dip_xa, idx, hr_dip) { + if (hr_dip->qp_cnt) + continue; + + *dip_idx = idx; + memcpy(hr_dip->dgid, grh->dgid.raw, sizeof(grh->dgid.raw)); + hr_dip->dip_idx = idx; + hr_dip->qp_cnt++; + hr_qp->dip = hr_dip; + break; }

- memcpy(hr_dip->dgid, grh->dgid.raw, sizeof(grh->dgid.raw)); - hr_dip->dip_idx = *dip_idx = spare_idx[*head]; - *head = (*head == hr_dev->caps.num_qps - 1) ? 0 : (*head + 1); - list_add_tail(&hr_dip->node, &hr_dev->dip_list); + /* This should never happen. */ + if (WARN_ON_ONCE(!hr_qp->dip)) + ret = -ENOSPC;

out: - spin_unlock_irqrestore(&hr_dev->dip_list_lock, flags); + xa_unlock(dip_xa); return ret; }

@@ -6005,6 +6032,20 @@ static int hns_roce_v2_destroy_qp_common(struct hns_roce_dev *hr_dev, return ret; }

+static void put_dip_ctx_idx(struct hns_roce_dev *hr_dev, + struct hns_roce_qp *hr_qp) +{ + struct hns_roce_dip *hr_dip = hr_qp->dip; + + xa_lock(&hr_dev->qp_table.dip_xa); + + hr_dip->qp_cnt--; + if (!hr_dip->qp_cnt) + memset(hr_dip->dgid, 0, GID_LEN_V2); + + xa_unlock(&hr_dev->qp_table.dip_xa); +} + int hns_roce_v2_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata) { struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device); @@ -6018,6 +6059,9 @@ int hns_roce_v2_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata) spin_unlock_irqrestore(&hr_qp->flush_lock, flags); flush_work(&hr_qp->flush_work.work);

+ if (hr_qp->cong_type == CONG_TYPE_DIP) + put_dip_ctx_idx(hr_dev, hr_qp); + ret = hns_roce_v2_destroy_qp_common(hr_dev, hr_qp, udata); if (ret) ibdev_err_ratelimited(&hr_dev->ib_dev, diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h index 201902dff611..f43444be0308 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h @@ -1366,7 +1366,7 @@ struct hns_roce_v2_priv { struct hns_roce_dip { u8 dgid[GID_LEN_V2]; u32 dip_idx; - struct list_head node; /* all dips are on a list */ + u32 qp_cnt; };

struct fmea_ram_ecc { diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c index d488c3d5986f..520112bd43d5 100644 --- a/drivers/infiniband/hw/hns/hns_roce_main.c +++ b/drivers/infiniband/hw/hns/hns_roce_main.c @@ -1250,8 +1250,6 @@ static int hns_roce_setup_hca(struct hns_roce_dev *hr_dev)

INIT_LIST_HEAD(&hr_dev->qp_list); spin_lock_init(&hr_dev->qp_list_lock); - INIT_LIST_HEAD(&hr_dev->dip_list); - spin_lock_init(&hr_dev->dip_list_lock);

INIT_LIST_HEAD(&hr_dev->uctx_list); mutex_init(&hr_dev->uctx_list_mutex); diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c b/drivers/infiniband/hw/hns/hns_roce_qp.c index 5ed2647567aa..77ec0c8678d3 100644 --- a/drivers/infiniband/hw/hns/hns_roce_qp.c +++ b/drivers/infiniband/hw/hns/hns_roce_qp.c @@ -1701,14 +1701,10 @@ int hns_roce_init_qp_table(struct hns_roce_dev *hr_dev) unsigned int reserved_from_bot; unsigned int i;

- qp_table->idx_table.spare_idx = kcalloc(hr_dev->caps.num_qps, - sizeof(u32), GFP_KERNEL); - if (!qp_table->idx_table.spare_idx) - return -ENOMEM; - mutex_init(&qp_table->scc_mutex); mutex_init(&qp_table->bank_mutex); xa_init(&hr_dev->qp_table_xa); + xa_init(&qp_table->dip_xa);

reserved_from_bot = hr_dev->caps.reserved_qps;

@@ -1733,7 +1729,7 @@ void hns_roce_cleanup_qp_table(struct hns_roce_dev *hr_dev)

for (i = 0; i < HNS_ROCE_QP_BANK_NUM; i++) ida_destroy(&hr_dev->qp_table.bank[i].ida); + xa_destroy(&hr_dev->qp_table.dip_xa); mutex_destroy(&hr_dev->qp_table.bank_mutex); mutex_destroy(&hr_dev->qp_table.scc_mutex); - kfree(hr_dev->qp_table.idx_table.spare_idx); } -- 2.33.0