From 7738613e7cb419179545910744b1777d87edac5c Mon Sep 17 00:00:00 2001 From: Ira Weiny Date: Wed, 13 May 2015 20:02:58 -0400 Subject: [PATCH] IB/core: Add per port immutable struct to ib_device As of commit 5eb620c81ce3 "IB/core: Add helpers for uncached GID and P_Key searches"; pkey_tbl_len and gid_tbl_len are immutable data which are stored in the ib_device. The per port core capability flags to be added later are also immutable data to be stored in the ib_device object. In preparation for this create a structure for per port immutable data and place the pkey and gid table lengths within this structure. "get_port_immutable" is added as a mandatory device function to allow the drivers to fill in this data. Signed-off-by: Ira Weiny Signed-off-by: Doug Ledford --- drivers/infiniband/core/device.c | 63 +++++++++----------- drivers/infiniband/core/sysfs.c | 1 + drivers/infiniband/hw/amso1100/c2_provider.c | 17 ++++++ drivers/infiniband/hw/cxgb3/iwch_provider.c | 17 ++++++ drivers/infiniband/hw/cxgb4/provider.c | 17 ++++++ drivers/infiniband/hw/ehca/ehca_main.c | 17 ++++++ drivers/infiniband/hw/ipath/ipath_verbs.c | 17 ++++++ drivers/infiniband/hw/mlx4/main.c | 17 ++++++ drivers/infiniband/hw/mlx5/main.c | 17 ++++++ drivers/infiniband/hw/mthca/mthca_provider.c | 17 ++++++ drivers/infiniband/hw/nes/nes_verbs.c | 16 +++++ drivers/infiniband/hw/ocrdma/ocrdma_main.c | 17 ++++++ drivers/infiniband/hw/qib/qib_verbs.c | 17 ++++++ drivers/infiniband/hw/usnic/usnic_ib_main.c | 17 ++++++ include/rdma/ib_verbs.h | 19 +++++- 15 files changed, 249 insertions(+), 37 deletions(-) diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index 0f16dd4d9bb4..4aa4f5420bc9 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -93,7 +93,8 @@ static int ib_device_check_mandatory(struct ib_device *device) IB_MANDATORY_FUNC(poll_cq), IB_MANDATORY_FUNC(req_notify_cq), IB_MANDATORY_FUNC(get_dma_mr), - IB_MANDATORY_FUNC(dereg_mr) + IB_MANDATORY_FUNC(dereg_mr), + IB_MANDATORY_FUNC(get_port_immutable) }; int i; @@ -211,42 +212,38 @@ static int add_client_context(struct ib_device *device, struct ib_client *client return 0; } -static int read_port_table_lengths(struct ib_device *device) +static int read_port_immutable(struct ib_device *device) { - struct ib_port_attr *tprops = NULL; - int num_ports, ret = -ENOMEM; - u8 port_index; - - tprops = kmalloc(sizeof *tprops, GFP_KERNEL); - if (!tprops) - goto out; - - num_ports = rdma_end_port(device) - rdma_start_port(device) + 1; - - device->pkey_tbl_len = kmalloc(sizeof *device->pkey_tbl_len * num_ports, - GFP_KERNEL); - device->gid_tbl_len = kmalloc(sizeof *device->gid_tbl_len * num_ports, - GFP_KERNEL); - if (!device->pkey_tbl_len || !device->gid_tbl_len) + int ret = -ENOMEM; + u8 start_port = rdma_start_port(device); + u8 end_port = rdma_end_port(device); + u8 port; + + /** + * device->port_immutable is indexed directly by the port number to make + * access to this data as efficient as possible. + * + * Therefore port_immutable is declared as a 1 based array with + * potential empty slots at the beginning. + */ + device->port_immutable = kzalloc(sizeof(*device->port_immutable) + * (end_port + 1), + GFP_KERNEL); + if (!device->port_immutable) goto err; - for (port_index = 0; port_index < num_ports; ++port_index) { - ret = ib_query_port(device, port_index + rdma_start_port(device), - tprops); + for (port = start_port; port <= end_port; ++port) { + ret = device->get_port_immutable(device, port, + &device->port_immutable[port]); if (ret) goto err; - device->pkey_tbl_len[port_index] = tprops->pkey_tbl_len; - device->gid_tbl_len[port_index] = tprops->gid_tbl_len; } ret = 0; goto out; - err: - kfree(device->gid_tbl_len); - kfree(device->pkey_tbl_len); + kfree(device->port_immutable); out: - kfree(tprops); return ret; } @@ -283,9 +280,9 @@ int ib_register_device(struct ib_device *device, spin_lock_init(&device->event_handler_lock); spin_lock_init(&device->client_data_lock); - ret = read_port_table_lengths(device); + ret = read_port_immutable(device); if (ret) { - printk(KERN_WARNING "Couldn't create table lengths cache for device %s\n", + printk(KERN_WARNING "Couldn't create per port immutable data %s\n", device->name); goto out; } @@ -294,8 +291,7 @@ int ib_register_device(struct ib_device *device, if (ret) { printk(KERN_WARNING "Couldn't register device %s with driver model\n", device->name); - kfree(device->gid_tbl_len); - kfree(device->pkey_tbl_len); + kfree(device->port_immutable); goto out; } @@ -337,9 +333,6 @@ void ib_unregister_device(struct ib_device *device) list_del(&device->core_list); - kfree(device->gid_tbl_len); - kfree(device->pkey_tbl_len); - mutex_unlock(&device_mutex); ib_device_unregister_sysfs(device); @@ -666,7 +659,7 @@ int ib_find_gid(struct ib_device *device, union ib_gid *gid, int ret, port, i; for (port = rdma_start_port(device); port <= rdma_end_port(device); ++port) { - for (i = 0; i < device->gid_tbl_len[port - rdma_start_port(device)]; ++i) { + for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) { ret = ib_query_gid(device, port, i, &tmp_gid); if (ret) return ret; @@ -698,7 +691,7 @@ int ib_find_pkey(struct ib_device *device, u16 tmp_pkey; int partial_ix = -1; - for (i = 0; i < device->pkey_tbl_len[port_num - rdma_start_port(device)]; ++i) { + for (i = 0; i < device->port_immutable[port_num].pkey_tbl_len; ++i) { ret = ib_query_pkey(device, port_num, i, &tmp_pkey); if (ret) return ret; diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c index cbd0383f622e..d0334c101ecb 100644 --- a/drivers/infiniband/core/sysfs.c +++ b/drivers/infiniband/core/sysfs.c @@ -456,6 +456,7 @@ static void ib_device_release(struct device *device) { struct ib_device *dev = container_of(device, struct ib_device, dev); + kfree(dev->port_immutable); kfree(dev); } diff --git a/drivers/infiniband/hw/amso1100/c2_provider.c b/drivers/infiniband/hw/amso1100/c2_provider.c index 6fe329a5d595..fa638963908f 100644 --- a/drivers/infiniband/hw/amso1100/c2_provider.c +++ b/drivers/infiniband/hw/amso1100/c2_provider.c @@ -763,6 +763,22 @@ static struct net_device *c2_pseudo_netdev_init(struct c2_dev *c2dev) return netdev; } +static int c2_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = c2_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + int c2_register_device(struct c2_dev *dev) { int ret = -ENOMEM; @@ -827,6 +843,7 @@ int c2_register_device(struct c2_dev *dev) dev->ibdev.reg_phys_mr = c2_reg_phys_mr; dev->ibdev.reg_user_mr = c2_reg_user_mr; dev->ibdev.dereg_mr = c2_dereg_mr; + dev->ibdev.get_port_immutable = c2_port_immutable; dev->ibdev.alloc_fmr = NULL; dev->ibdev.unmap_fmr = NULL; diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c index 298d1caab3a5..590ba0f422a1 100644 --- a/drivers/infiniband/hw/cxgb3/iwch_provider.c +++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c @@ -1349,6 +1349,22 @@ static struct device_attribute *iwch_class_attributes[] = { &dev_attr_board_id, }; +static int iwch_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = iwch_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + int iwch_register_device(struct iwch_dev *dev) { int ret; @@ -1427,6 +1443,7 @@ int iwch_register_device(struct iwch_dev *dev) dev->ibdev.post_recv = iwch_post_receive; dev->ibdev.get_protocol_stats = iwch_get_mib; dev->ibdev.uverbs_abi_ver = IWCH_UVERBS_ABI_VERSION; + dev->ibdev.get_port_immutable = iwch_port_immutable; dev->ibdev.iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL); if (!dev->ibdev.iwcm) diff --git a/drivers/infiniband/hw/cxgb4/provider.c b/drivers/infiniband/hw/cxgb4/provider.c index f52ee6343d41..5eded1b3bbad 100644 --- a/drivers/infiniband/hw/cxgb4/provider.c +++ b/drivers/infiniband/hw/cxgb4/provider.c @@ -471,6 +471,22 @@ static struct device_attribute *c4iw_class_attributes[] = { &dev_attr_board_id, }; +static int c4iw_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = c4iw_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + int c4iw_register_device(struct c4iw_dev *dev) { int ret; @@ -549,6 +565,7 @@ int c4iw_register_device(struct c4iw_dev *dev) dev->ibdev.post_recv = c4iw_post_receive; dev->ibdev.get_protocol_stats = c4iw_get_mib; dev->ibdev.uverbs_abi_ver = C4IW_UVERBS_ABI_VERSION; + dev->ibdev.get_port_immutable = c4iw_port_immutable; dev->ibdev.iwcm = kmalloc(sizeof(struct iw_cm_verbs), GFP_KERNEL); if (!dev->ibdev.iwcm) diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c index 321545b708ad..8454186e16ab 100644 --- a/drivers/infiniband/hw/ehca/ehca_main.c +++ b/drivers/infiniband/hw/ehca/ehca_main.c @@ -431,6 +431,22 @@ init_node_guid1: return ret; } +static int ehca_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = ehca_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + static int ehca_init_device(struct ehca_shca *shca) { int ret; @@ -511,6 +527,7 @@ static int ehca_init_device(struct ehca_shca *shca) shca->ib_device.process_mad = ehca_process_mad; shca->ib_device.mmap = ehca_mmap; shca->ib_device.dma_ops = &ehca_dma_mapping_ops; + shca->ib_device.get_port_immutable = ehca_port_immutable; if (EHCA_BMASK_GET(HCA_CAP_SRQ, shca->hca_cap)) { shca->ib_device.uverbs_cmd_mask |= diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c index 34b94c3ae674..49b774b6f7e8 100644 --- a/drivers/infiniband/hw/ipath/ipath_verbs.c +++ b/drivers/infiniband/hw/ipath/ipath_verbs.c @@ -1986,6 +1986,22 @@ static int disable_timer(struct ipath_devdata *dd) return 0; } +static int ipath_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = ipath_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + /** * ipath_register_ib_device - register our device with the infiniband core * @dd: the device data structure @@ -2186,6 +2202,7 @@ int ipath_register_ib_device(struct ipath_devdata *dd) dev->process_mad = ipath_process_mad; dev->mmap = ipath_mmap; dev->dma_ops = &ipath_dma_mapping_ops; + dev->get_port_immutable = ipath_port_immutable; snprintf(dev->node_desc, sizeof(dev->node_desc), IPATH_IDSTR " %s", init_utsname()->nodename); diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index 64f591437925..f46b1be08fc5 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -2123,6 +2123,22 @@ static void mlx4_ib_free_eqs(struct mlx4_dev *dev, struct mlx4_ib_dev *ibdev) kfree(ibdev->eq_table); } +static int mlx4_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = mlx4_ib_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + static void *mlx4_ib_add(struct mlx4_dev *dev) { struct mlx4_ib_dev *ibdev; @@ -2251,6 +2267,7 @@ static void *mlx4_ib_add(struct mlx4_dev *dev) ibdev->ib_dev.attach_mcast = mlx4_ib_mcg_attach; ibdev->ib_dev.detach_mcast = mlx4_ib_mcg_detach; ibdev->ib_dev.process_mad = mlx4_ib_process_mad; + ibdev->ib_dev.get_port_immutable = mlx4_port_immutable; if (!mlx4_is_slave(ibdev->dev)) { ibdev->ib_dev.alloc_fmr = mlx4_ib_fmr_alloc; diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 8dec38055c49..8db0edca6dd8 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1188,6 +1188,22 @@ static void destroy_dev_resources(struct mlx5_ib_resources *devr) mlx5_ib_dealloc_pd(devr->p0); } +static int mlx5_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = mlx5_ib_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + static void *mlx5_ib_add(struct mlx5_core_dev *mdev) { struct mlx5_ib_dev *dev; @@ -1292,6 +1308,7 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev) dev->ib_dev.alloc_fast_reg_page_list = mlx5_ib_alloc_fast_reg_page_list; dev->ib_dev.free_fast_reg_page_list = mlx5_ib_free_fast_reg_page_list; dev->ib_dev.check_mr_status = mlx5_ib_check_mr_status; + dev->ib_dev.get_port_immutable = mlx5_port_immutable; mlx5_ib_internal_query_odp_caps(dev); diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c index ad1cca3a3a5c..4662fd20b8e6 100644 --- a/drivers/infiniband/hw/mthca/mthca_provider.c +++ b/drivers/infiniband/hw/mthca/mthca_provider.c @@ -1250,6 +1250,22 @@ out: return err; } +static int mthca_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = mthca_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + int mthca_register_device(struct mthca_dev *dev) { int ret; @@ -1330,6 +1346,7 @@ int mthca_register_device(struct mthca_dev *dev) dev->ib_dev.reg_phys_mr = mthca_reg_phys_mr; dev->ib_dev.reg_user_mr = mthca_reg_user_mr; dev->ib_dev.dereg_mr = mthca_dereg_mr; + dev->ib_dev.get_port_immutable = mthca_port_immutable; if (dev->mthca_flags & MTHCA_FLAG_FMR) { dev->ib_dev.alloc_fmr = mthca_alloc_fmr; diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c index 027f6d1cd059..4ed2d967d324 100644 --- a/drivers/infiniband/hw/nes/nes_verbs.c +++ b/drivers/infiniband/hw/nes/nes_verbs.c @@ -3833,6 +3833,21 @@ static int nes_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_ return 0; } +static int nes_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = nes_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} /** * nes_init_ofa_device @@ -3934,6 +3949,7 @@ struct nes_ib_device *nes_init_ofa_device(struct net_device *netdev) nesibdev->ibdev.iwcm->reject = nes_reject; nesibdev->ibdev.iwcm->create_listen = nes_create_listen; nesibdev->ibdev.iwcm->destroy_listen = nes_destroy_listen; + nesibdev->ibdev.get_port_immutable = nes_port_immutable; return nesibdev; } diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_main.c b/drivers/infiniband/hw/ocrdma/ocrdma_main.c index 85d99e9306a0..21744be6cac5 100644 --- a/drivers/infiniband/hw/ocrdma/ocrdma_main.c +++ b/drivers/infiniband/hw/ocrdma/ocrdma_main.c @@ -202,6 +202,22 @@ static enum rdma_link_layer ocrdma_link_layer(struct ib_device *device, return IB_LINK_LAYER_ETHERNET; } +static int ocrdma_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = ocrdma_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + static int ocrdma_register_device(struct ocrdma_dev *dev) { strlcpy(dev->ibdev.name, "ocrdma%d", IB_DEVICE_NAME_MAX); @@ -287,6 +303,7 @@ static int ocrdma_register_device(struct ocrdma_dev *dev) dev->ibdev.dma_device = &dev->nic_info.pdev->dev; dev->ibdev.process_mad = ocrdma_process_mad; + dev->ibdev.get_port_immutable = ocrdma_port_immutable; if (ocrdma_get_asic_type(dev) == OCRDMA_ASIC_GEN_SKH_R) { dev->ibdev.uverbs_cmd_mask |= diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c index 9fd4b285e5e5..48f4784c53a6 100644 --- a/drivers/infiniband/hw/qib/qib_verbs.c +++ b/drivers/infiniband/hw/qib/qib_verbs.c @@ -2046,6 +2046,22 @@ static void init_ibport(struct qib_pportdata *ppd) RCU_INIT_POINTER(ibp->qp1, NULL); } +static int qib_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = qib_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + /** * qib_register_ib_device - register our device with the infiniband core * @dd: the device data structure @@ -2234,6 +2250,7 @@ int qib_register_ib_device(struct qib_devdata *dd) ibdev->process_mad = qib_process_mad; ibdev->mmap = qib_mmap; ibdev->dma_ops = &qib_dma_mapping_ops; + ibdev->get_port_immutable = qib_port_immutable; snprintf(ibdev->node_desc, sizeof(ibdev->node_desc), "Intel Infiniband HCA %s", init_utsname()->nodename); diff --git a/drivers/infiniband/hw/usnic/usnic_ib_main.c b/drivers/infiniband/hw/usnic/usnic_ib_main.c index bd9f364e909c..ce3e19bcfe00 100644 --- a/drivers/infiniband/hw/usnic/usnic_ib_main.c +++ b/drivers/infiniband/hw/usnic/usnic_ib_main.c @@ -300,6 +300,22 @@ static struct notifier_block usnic_ib_inetaddr_notifier = { }; /* End of inet section*/ +static int usnic_port_immutable(struct ib_device *ibdev, u8 port_num, + struct ib_port_immutable *immutable) +{ + struct ib_port_attr attr; + int err; + + err = usnic_ib_query_port(ibdev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + + return 0; +} + /* Start of PF discovery section */ static void *usnic_ib_device_add(struct pci_dev *dev) { @@ -384,6 +400,7 @@ static void *usnic_ib_device_add(struct pci_dev *dev) us_ibdev->ib_dev.poll_cq = usnic_ib_poll_cq; us_ibdev->ib_dev.req_notify_cq = usnic_ib_req_notify_cq; us_ibdev->ib_dev.get_dma_mr = usnic_ib_get_dma_mr; + us_ibdev->ib_dev.get_port_immutable = usnic_port_immutable; if (ib_register_device(&us_ibdev->ib_dev, NULL)) diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index be4465b5df7b..2d3515edc3fa 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -1481,6 +1481,11 @@ struct ib_dma_mapping_ops { struct iw_cm_verbs; +struct ib_port_immutable { + int pkey_tbl_len; + int gid_tbl_len; +}; + struct ib_device { struct device *dma_device; @@ -1494,8 +1499,10 @@ struct ib_device { struct list_head client_data_list; struct ib_cache cache; - int *pkey_tbl_len; - int *gid_tbl_len; + /** + * port_immutable is indexed by port number + */ + struct ib_port_immutable *port_immutable; int num_comp_vectors; @@ -1684,6 +1691,14 @@ struct ib_device { u32 local_dma_lkey; u8 node_type; u8 phys_port_cnt; + + /** + * The following mandatory functions are used only at device + * registration. Keep functions such as these at the end of this + * structure to avoid cache line misses when accessing struct ib_device + * in fast paths. + */ + int (*get_port_immutable)(struct ib_device *, u8, struct ib_port_immutable *); }; struct ib_client { -- 2.20.1