| /* |
| * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/debugfs.h> |
| |
| #include <rdma/ib_verbs.h> |
| |
| #include "iw_cxgb4.h" |
| |
| #define DRV_VERSION "0.1" |
| |
| MODULE_AUTHOR("Steve Wise"); |
| MODULE_DESCRIPTION("Chelsio T4 RDMA Driver"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_VERSION(DRV_VERSION); |
| |
| struct uld_ctx { |
| struct list_head entry; |
| struct cxgb4_lld_info lldi; |
| struct c4iw_dev *dev; |
| }; |
| |
| static LIST_HEAD(uld_ctx_list); |
| static DEFINE_MUTEX(dev_mutex); |
| |
| static struct dentry *c4iw_debugfs_root; |
| |
| struct c4iw_debugfs_data { |
| struct c4iw_dev *devp; |
| char *buf; |
| int bufsize; |
| int pos; |
| }; |
| |
| static int count_idrs(int id, void *p, void *data) |
| { |
| int *countp = data; |
| |
| *countp = *countp + 1; |
| return 0; |
| } |
| |
| static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count, |
| loff_t *ppos) |
| { |
| struct c4iw_debugfs_data *d = file->private_data; |
| |
| return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos); |
| } |
| |
| static int dump_qp(int id, void *p, void *data) |
| { |
| struct c4iw_qp *qp = p; |
| struct c4iw_debugfs_data *qpd = data; |
| int space; |
| int cc; |
| |
| if (id != qp->wq.sq.qid) |
| return 0; |
| |
| space = qpd->bufsize - qpd->pos - 1; |
| if (space == 0) |
| return 1; |
| |
| if (qp->ep) |
| cc = snprintf(qpd->buf + qpd->pos, space, |
| "qp sq id %u rq id %u state %u onchip %u " |
| "ep tid %u state %u %pI4:%u->%pI4:%u\n", |
| qp->wq.sq.qid, qp->wq.rq.qid, (int)qp->attr.state, |
| qp->wq.sq.flags & T4_SQ_ONCHIP, |
| qp->ep->hwtid, (int)qp->ep->com.state, |
| &qp->ep->com.local_addr.sin_addr.s_addr, |
| ntohs(qp->ep->com.local_addr.sin_port), |
| &qp->ep->com.remote_addr.sin_addr.s_addr, |
| ntohs(qp->ep->com.remote_addr.sin_port)); |
| else |
| cc = snprintf(qpd->buf + qpd->pos, space, |
| "qp sq id %u rq id %u state %u onchip %u\n", |
| qp->wq.sq.qid, qp->wq.rq.qid, |
| (int)qp->attr.state, |
| qp->wq.sq.flags & T4_SQ_ONCHIP); |
| if (cc < space) |
| qpd->pos += cc; |
| return 0; |
| } |
| |
| static int qp_release(struct inode *inode, struct file *file) |
| { |
| struct c4iw_debugfs_data *qpd = file->private_data; |
| if (!qpd) { |
| printk(KERN_INFO "%s null qpd?\n", __func__); |
| return 0; |
| } |
| kfree(qpd->buf); |
| kfree(qpd); |
| return 0; |
| } |
| |
| static int qp_open(struct inode *inode, struct file *file) |
| { |
| struct c4iw_debugfs_data *qpd; |
| int ret = 0; |
| int count = 1; |
| |
| qpd = kmalloc(sizeof *qpd, GFP_KERNEL); |
| if (!qpd) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| qpd->devp = inode->i_private; |
| qpd->pos = 0; |
| |
| spin_lock_irq(&qpd->devp->lock); |
| idr_for_each(&qpd->devp->qpidr, count_idrs, &count); |
| spin_unlock_irq(&qpd->devp->lock); |
| |
| qpd->bufsize = count * 128; |
| qpd->buf = kmalloc(qpd->bufsize, GFP_KERNEL); |
| if (!qpd->buf) { |
| ret = -ENOMEM; |
| goto err1; |
| } |
| |
| spin_lock_irq(&qpd->devp->lock); |
| idr_for_each(&qpd->devp->qpidr, dump_qp, qpd); |
| spin_unlock_irq(&qpd->devp->lock); |
| |
| qpd->buf[qpd->pos++] = 0; |
| file->private_data = qpd; |
| goto out; |
| err1: |
| kfree(qpd); |
| out: |
| return ret; |
| } |
| |
| static const struct file_operations qp_debugfs_fops = { |
| .owner = THIS_MODULE, |
| .open = qp_open, |
| .release = qp_release, |
| .read = debugfs_read, |
| .llseek = default_llseek, |
| }; |
| |
| static int dump_stag(int id, void *p, void *data) |
| { |
| struct c4iw_debugfs_data *stagd = data; |
| int space; |
| int cc; |
| |
| space = stagd->bufsize - stagd->pos - 1; |
| if (space == 0) |
| return 1; |
| |
| cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8); |
| if (cc < space) |
| stagd->pos += cc; |
| return 0; |
| } |
| |
| static int stag_release(struct inode *inode, struct file *file) |
| { |
| struct c4iw_debugfs_data *stagd = file->private_data; |
| if (!stagd) { |
| printk(KERN_INFO "%s null stagd?\n", __func__); |
| return 0; |
| } |
| kfree(stagd->buf); |
| kfree(stagd); |
| return 0; |
| } |
| |
| static int stag_open(struct inode *inode, struct file *file) |
| { |
| struct c4iw_debugfs_data *stagd; |
| int ret = 0; |
| int count = 1; |
| |
| stagd = kmalloc(sizeof *stagd, GFP_KERNEL); |
| if (!stagd) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| stagd->devp = inode->i_private; |
| stagd->pos = 0; |
| |
| spin_lock_irq(&stagd->devp->lock); |
| idr_for_each(&stagd->devp->mmidr, count_idrs, &count); |
| spin_unlock_irq(&stagd->devp->lock); |
| |
| stagd->bufsize = count * sizeof("0x12345678\n"); |
| stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL); |
| if (!stagd->buf) { |
| ret = -ENOMEM; |
| goto err1; |
| } |
| |
| spin_lock_irq(&stagd->devp->lock); |
| idr_for_each(&stagd->devp->mmidr, dump_stag, stagd); |
| spin_unlock_irq(&stagd->devp->lock); |
| |
| stagd->buf[stagd->pos++] = 0; |
| file->private_data = stagd; |
| goto out; |
| err1: |
| kfree(stagd); |
| out: |
| return ret; |
| } |
| |
| static const struct file_operations stag_debugfs_fops = { |
| .owner = THIS_MODULE, |
| .open = stag_open, |
| .release = stag_release, |
| .read = debugfs_read, |
| .llseek = default_llseek, |
| }; |
| |
| static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY"}; |
| |
| static int stats_show(struct seq_file *seq, void *v) |
| { |
| struct c4iw_dev *dev = seq->private; |
| |
| seq_printf(seq, " Object: %10s %10s %10s\n", "Total", "Current", "Max"); |
| seq_printf(seq, " PDID: %10llu %10llu %10llu\n", |
| dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur, |
| dev->rdev.stats.pd.max); |
| seq_printf(seq, " QID: %10llu %10llu %10llu\n", |
| dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur, |
| dev->rdev.stats.qid.max); |
| seq_printf(seq, " TPTMEM: %10llu %10llu %10llu\n", |
| dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur, |
| dev->rdev.stats.stag.max); |
| seq_printf(seq, " PBLMEM: %10llu %10llu %10llu\n", |
| dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur, |
| dev->rdev.stats.pbl.max); |
| seq_printf(seq, " RQTMEM: %10llu %10llu %10llu\n", |
| dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur, |
| dev->rdev.stats.rqt.max); |
| seq_printf(seq, " OCQPMEM: %10llu %10llu %10llu\n", |
| dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur, |
| dev->rdev.stats.ocqp.max); |
| seq_printf(seq, " DB FULL: %10llu\n", dev->rdev.stats.db_full); |
| seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty); |
| seq_printf(seq, " DB DROP: %10llu\n", dev->rdev.stats.db_drop); |
| seq_printf(seq, " DB State: %s Transitions %llu\n", |
| db_state_str[dev->db_state], |
| dev->rdev.stats.db_state_transitions); |
| return 0; |
| } |
| |
| static int stats_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, stats_show, inode->i_private); |
| } |
| |
| static ssize_t stats_clear(struct file *file, const char __user *buf, |
| size_t count, loff_t *pos) |
| { |
| struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private; |
| |
| mutex_lock(&dev->rdev.stats.lock); |
| dev->rdev.stats.pd.max = 0; |
| dev->rdev.stats.qid.max = 0; |
| dev->rdev.stats.stag.max = 0; |
| dev->rdev.stats.pbl.max = 0; |
| dev->rdev.stats.rqt.max = 0; |
| dev->rdev.stats.ocqp.max = 0; |
| dev->rdev.stats.db_full = 0; |
| dev->rdev.stats.db_empty = 0; |
| dev->rdev.stats.db_drop = 0; |
| dev->rdev.stats.db_state_transitions = 0; |
| mutex_unlock(&dev->rdev.stats.lock); |
| return count; |
| } |
| |
| static const struct file_operations stats_debugfs_fops = { |
| .owner = THIS_MODULE, |
| .open = stats_open, |
| .release = single_release, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .write = stats_clear, |
| }; |
| |
| static int setup_debugfs(struct c4iw_dev *devp) |
| { |
| struct dentry *de; |
| |
| if (!devp->debugfs_root) |
| return -1; |
| |
| de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root, |
| (void *)devp, &qp_debugfs_fops); |
| if (de && de->d_inode) |
| de->d_inode->i_size = 4096; |
| |
| de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root, |
| (void *)devp, &stag_debugfs_fops); |
| if (de && de->d_inode) |
| de->d_inode->i_size = 4096; |
| |
| de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root, |
| (void *)devp, &stats_debugfs_fops); |
| if (de && de->d_inode) |
| de->d_inode->i_size = 4096; |
| |
| return 0; |
| } |
| |
| void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev, |
| struct c4iw_dev_ucontext *uctx) |
| { |
| struct list_head *pos, *nxt; |
| struct c4iw_qid_list *entry; |
| |
| mutex_lock(&uctx->lock); |
| list_for_each_safe(pos, nxt, &uctx->qpids) { |
| entry = list_entry(pos, struct c4iw_qid_list, entry); |
| list_del_init(&entry->entry); |
| if (!(entry->qid & rdev->qpmask)) { |
| c4iw_put_resource(&rdev->resource.qid_fifo, entry->qid, |
| &rdev->resource.qid_fifo_lock); |
| mutex_lock(&rdev->stats.lock); |
| rdev->stats.qid.cur -= rdev->qpmask + 1; |
| mutex_unlock(&rdev->stats.lock); |
| } |
| kfree(entry); |
| } |
| |
| list_for_each_safe(pos, nxt, &uctx->qpids) { |
| entry = list_entry(pos, struct c4iw_qid_list, entry); |
| list_del_init(&entry->entry); |
| kfree(entry); |
| } |
| mutex_unlock(&uctx->lock); |
| } |
| |
| void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev, |
| struct c4iw_dev_ucontext *uctx) |
| { |
| INIT_LIST_HEAD(&uctx->qpids); |
| INIT_LIST_HEAD(&uctx->cqids); |
| mutex_init(&uctx->lock); |
| } |
| |
| /* Caller takes care of locking if needed */ |
| static int c4iw_rdev_open(struct c4iw_rdev *rdev) |
| { |
| int err; |
| |
| c4iw_init_dev_ucontext(rdev, &rdev->uctx); |
| |
| /* |
| * qpshift is the number of bits to shift the qpid left in order |
| * to get the correct address of the doorbell for that qp. |
| */ |
| rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density); |
| rdev->qpmask = rdev->lldi.udb_density - 1; |
| rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density); |
| rdev->cqmask = rdev->lldi.ucq_density - 1; |
| PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d " |
| "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x " |
| "qp qid start %u size %u cq qid start %u size %u\n", |
| __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start, |
| rdev->lldi.vr->stag.size, c4iw_num_stags(rdev), |
| rdev->lldi.vr->pbl.start, |
| rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start, |
| rdev->lldi.vr->rq.size, |
| rdev->lldi.vr->qp.start, |
| rdev->lldi.vr->qp.size, |
| rdev->lldi.vr->cq.start, |
| rdev->lldi.vr->cq.size); |
| PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu " |
| "qpmask 0x%x cqshift %lu cqmask 0x%x\n", |
| (unsigned)pci_resource_len(rdev->lldi.pdev, 2), |
| (void *)pci_resource_start(rdev->lldi.pdev, 2), |
| rdev->lldi.db_reg, |
| rdev->lldi.gts_reg, |
| rdev->qpshift, rdev->qpmask, |
| rdev->cqshift, rdev->cqmask); |
| |
| if (c4iw_num_stags(rdev) == 0) { |
| err = -EINVAL; |
| goto err1; |
| } |
| |
| rdev->stats.pd.total = T4_MAX_NUM_PD; |
| rdev->stats.stag.total = rdev->lldi.vr->stag.size; |
| rdev->stats.pbl.total = rdev->lldi.vr->pbl.size; |
| rdev->stats.rqt.total = rdev->lldi.vr->rq.size; |
| rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size; |
| rdev->stats.qid.total = rdev->lldi.vr->qp.size; |
| |
| err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD); |
| if (err) { |
| printk(KERN_ERR MOD "error %d initializing resources\n", err); |
| goto err1; |
| } |
| err = c4iw_pblpool_create(rdev); |
| if (err) { |
| printk(KERN_ERR MOD "error %d initializing pbl pool\n", err); |
| goto err2; |
| } |
| err = c4iw_rqtpool_create(rdev); |
| if (err) { |
| printk(KERN_ERR MOD "error %d initializing rqt pool\n", err); |
| goto err3; |
| } |
| err = c4iw_ocqp_pool_create(rdev); |
| if (err) { |
| printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err); |
| goto err4; |
| } |
| return 0; |
| err4: |
| c4iw_rqtpool_destroy(rdev); |
| err3: |
| c4iw_pblpool_destroy(rdev); |
| err2: |
| c4iw_destroy_resource(&rdev->resource); |
| err1: |
| return err; |
| } |
| |
| static void c4iw_rdev_close(struct c4iw_rdev *rdev) |
| { |
| c4iw_pblpool_destroy(rdev); |
| c4iw_rqtpool_destroy(rdev); |
| c4iw_destroy_resource(&rdev->resource); |
| } |
| |
| static void c4iw_dealloc(struct uld_ctx *ctx) |
| { |
| c4iw_rdev_close(&ctx->dev->rdev); |
| idr_destroy(&ctx->dev->cqidr); |
| idr_destroy(&ctx->dev->qpidr); |
| idr_destroy(&ctx->dev->mmidr); |
| iounmap(ctx->dev->rdev.oc_mw_kva); |
| ib_dealloc_device(&ctx->dev->ibdev); |
| ctx->dev = NULL; |
| } |
| |
| static void c4iw_remove(struct uld_ctx *ctx) |
| { |
| PDBG("%s c4iw_dev %p\n", __func__, ctx->dev); |
| c4iw_unregister_device(ctx->dev); |
| c4iw_dealloc(ctx); |
| } |
| |
| static int rdma_supported(const struct cxgb4_lld_info *infop) |
| { |
| return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 && |
| infop->vr->rq.size > 0 && infop->vr->qp.size > 0 && |
| infop->vr->cq.size > 0 && infop->vr->ocq.size > 0; |
| } |
| |
| static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop) |
| { |
| struct c4iw_dev *devp; |
| int ret; |
| |
| if (!rdma_supported(infop)) { |
| printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n", |
| pci_name(infop->pdev)); |
| return ERR_PTR(-ENOSYS); |
| } |
| devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp)); |
| if (!devp) { |
| printk(KERN_ERR MOD "Cannot allocate ib device\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| devp->rdev.lldi = *infop; |
| |
| devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) + |
| (pci_resource_len(devp->rdev.lldi.pdev, 2) - |
| roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size)); |
| devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa, |
| devp->rdev.lldi.vr->ocq.size); |
| |
| PDBG(KERN_INFO MOD "ocq memory: " |
| "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n", |
| devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size, |
| devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva); |
| |
| ret = c4iw_rdev_open(&devp->rdev); |
| if (ret) { |
| printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret); |
| ib_dealloc_device(&devp->ibdev); |
| return ERR_PTR(ret); |
| } |
| |
| idr_init(&devp->cqidr); |
| idr_init(&devp->qpidr); |
| idr_init(&devp->mmidr); |
| spin_lock_init(&devp->lock); |
| mutex_init(&devp->rdev.stats.lock); |
| mutex_init(&devp->db_mutex); |
| |
| if (c4iw_debugfs_root) { |
| devp->debugfs_root = debugfs_create_dir( |
| pci_name(devp->rdev.lldi.pdev), |
| c4iw_debugfs_root); |
| setup_debugfs(devp); |
| } |
| return devp; |
| } |
| |
| static void *c4iw_uld_add(const struct cxgb4_lld_info *infop) |
| { |
| struct uld_ctx *ctx; |
| static int vers_printed; |
| int i; |
| |
| if (!vers_printed++) |
| printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n", |
| DRV_VERSION); |
| |
| ctx = kzalloc(sizeof *ctx, GFP_KERNEL); |
| if (!ctx) { |
| ctx = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| ctx->lldi = *infop; |
| |
| PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n", |
| __func__, pci_name(ctx->lldi.pdev), |
| ctx->lldi.nchan, ctx->lldi.nrxq, |
| ctx->lldi.ntxq, ctx->lldi.nports); |
| |
| mutex_lock(&dev_mutex); |
| list_add_tail(&ctx->entry, &uld_ctx_list); |
| mutex_unlock(&dev_mutex); |
| |
| for (i = 0; i < ctx->lldi.nrxq; i++) |
| PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]); |
| out: |
| return ctx; |
| } |
| |
| static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp, |
| const struct pkt_gl *gl) |
| { |
| struct uld_ctx *ctx = handle; |
| struct c4iw_dev *dev = ctx->dev; |
| struct sk_buff *skb; |
| const struct cpl_act_establish *rpl; |
| unsigned int opcode; |
| |
| if (gl == NULL) { |
| /* omit RSS and rsp_ctrl at end of descriptor */ |
| unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8; |
| |
| skb = alloc_skb(256, GFP_ATOMIC); |
| if (!skb) |
| goto nomem; |
| __skb_put(skb, len); |
| skb_copy_to_linear_data(skb, &rsp[1], len); |
| } else if (gl == CXGB4_MSG_AN) { |
| const struct rsp_ctrl *rc = (void *)rsp; |
| |
| u32 qid = be32_to_cpu(rc->pldbuflen_qid); |
| c4iw_ev_handler(dev, qid); |
| return 0; |
| } else { |
| skb = cxgb4_pktgl_to_skb(gl, 128, 128); |
| if (unlikely(!skb)) |
| goto nomem; |
| } |
| |
| rpl = cplhdr(skb); |
| opcode = rpl->ot.opcode; |
| |
| if (c4iw_handlers[opcode]) |
| c4iw_handlers[opcode](dev, skb); |
| else |
| printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__, |
| opcode); |
| |
| return 0; |
| nomem: |
| return -1; |
| } |
| |
| static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state) |
| { |
| struct uld_ctx *ctx = handle; |
| |
| PDBG("%s new_state %u\n", __func__, new_state); |
| switch (new_state) { |
| case CXGB4_STATE_UP: |
| printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev)); |
| if (!ctx->dev) { |
| int ret; |
| |
| ctx->dev = c4iw_alloc(&ctx->lldi); |
| if (IS_ERR(ctx->dev)) { |
| printk(KERN_ERR MOD |
| "%s: initialization failed: %ld\n", |
| pci_name(ctx->lldi.pdev), |
| PTR_ERR(ctx->dev)); |
| ctx->dev = NULL; |
| break; |
| } |
| ret = c4iw_register_device(ctx->dev); |
| if (ret) { |
| printk(KERN_ERR MOD |
| "%s: RDMA registration failed: %d\n", |
| pci_name(ctx->lldi.pdev), ret); |
| c4iw_dealloc(ctx); |
| } |
| } |
| break; |
| case CXGB4_STATE_DOWN: |
| printk(KERN_INFO MOD "%s: Down\n", |
| pci_name(ctx->lldi.pdev)); |
| if (ctx->dev) |
| c4iw_remove(ctx); |
| break; |
| case CXGB4_STATE_START_RECOVERY: |
| printk(KERN_INFO MOD "%s: Fatal Error\n", |
| pci_name(ctx->lldi.pdev)); |
| if (ctx->dev) { |
| struct ib_event event; |
| |
| ctx->dev->rdev.flags |= T4_FATAL_ERROR; |
| memset(&event, 0, sizeof event); |
| event.event = IB_EVENT_DEVICE_FATAL; |
| event.device = &ctx->dev->ibdev; |
| ib_dispatch_event(&event); |
| c4iw_remove(ctx); |
| } |
| break; |
| case CXGB4_STATE_DETACH: |
| printk(KERN_INFO MOD "%s: Detach\n", |
| pci_name(ctx->lldi.pdev)); |
| if (ctx->dev) |
| c4iw_remove(ctx); |
| break; |
| } |
| return 0; |
| } |
| |
| static int disable_qp_db(int id, void *p, void *data) |
| { |
| struct c4iw_qp *qp = p; |
| |
| t4_disable_wq_db(&qp->wq); |
| return 0; |
| } |
| |
| static void stop_queues(struct uld_ctx *ctx) |
| { |
| spin_lock_irq(&ctx->dev->lock); |
| if (ctx->dev->db_state == NORMAL) { |
| ctx->dev->rdev.stats.db_state_transitions++; |
| ctx->dev->db_state = FLOW_CONTROL; |
| idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL); |
| } |
| spin_unlock_irq(&ctx->dev->lock); |
| } |
| |
| static int enable_qp_db(int id, void *p, void *data) |
| { |
| struct c4iw_qp *qp = p; |
| |
| t4_enable_wq_db(&qp->wq); |
| return 0; |
| } |
| |
| static void resume_queues(struct uld_ctx *ctx) |
| { |
| spin_lock_irq(&ctx->dev->lock); |
| if (ctx->dev->qpcnt <= db_fc_threshold && |
| ctx->dev->db_state == FLOW_CONTROL) { |
| ctx->dev->db_state = NORMAL; |
| ctx->dev->rdev.stats.db_state_transitions++; |
| idr_for_each(&ctx->dev->qpidr, enable_qp_db, NULL); |
| } |
| spin_unlock_irq(&ctx->dev->lock); |
| } |
| |
| struct qp_list { |
| unsigned idx; |
| struct c4iw_qp **qps; |
| }; |
| |
| static int add_and_ref_qp(int id, void *p, void *data) |
| { |
| struct qp_list *qp_listp = data; |
| struct c4iw_qp *qp = p; |
| |
| c4iw_qp_add_ref(&qp->ibqp); |
| qp_listp->qps[qp_listp->idx++] = qp; |
| return 0; |
| } |
| |
| static int count_qps(int id, void *p, void *data) |
| { |
| unsigned *countp = data; |
| (*countp)++; |
| return 0; |
| } |
| |
| static void deref_qps(struct qp_list qp_list) |
| { |
| int idx; |
| |
| for (idx = 0; idx < qp_list.idx; idx++) |
| c4iw_qp_rem_ref(&qp_list.qps[idx]->ibqp); |
| } |
| |
| static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list) |
| { |
| int idx; |
| int ret; |
| |
| for (idx = 0; idx < qp_list->idx; idx++) { |
| struct c4iw_qp *qp = qp_list->qps[idx]; |
| |
| ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0], |
| qp->wq.sq.qid, |
| t4_sq_host_wq_pidx(&qp->wq), |
| t4_sq_wq_size(&qp->wq)); |
| if (ret) { |
| printk(KERN_ERR MOD "%s: Fatal error - " |
| "DB overflow recovery failed - " |
| "error syncing SQ qid %u\n", |
| pci_name(ctx->lldi.pdev), qp->wq.sq.qid); |
| return; |
| } |
| |
| ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0], |
| qp->wq.rq.qid, |
| t4_rq_host_wq_pidx(&qp->wq), |
| t4_rq_wq_size(&qp->wq)); |
| |
| if (ret) { |
| printk(KERN_ERR MOD "%s: Fatal error - " |
| "DB overflow recovery failed - " |
| "error syncing RQ qid %u\n", |
| pci_name(ctx->lldi.pdev), qp->wq.rq.qid); |
| return; |
| } |
| |
| /* Wait for the dbfifo to drain */ |
| while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) { |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| schedule_timeout(usecs_to_jiffies(10)); |
| } |
| } |
| } |
| |
| static void recover_queues(struct uld_ctx *ctx) |
| { |
| int count = 0; |
| struct qp_list qp_list; |
| int ret; |
| |
| /* lock out kernel db ringers */ |
| mutex_lock(&ctx->dev->db_mutex); |
| |
| /* put all queues in to recovery mode */ |
| spin_lock_irq(&ctx->dev->lock); |
| ctx->dev->db_state = RECOVERY; |
| ctx->dev->rdev.stats.db_state_transitions++; |
| idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL); |
| spin_unlock_irq(&ctx->dev->lock); |
| |
| /* slow everybody down */ |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| schedule_timeout(usecs_to_jiffies(1000)); |
| |
| /* Wait for the dbfifo to completely drain. */ |
| while (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1) > 0) { |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| schedule_timeout(usecs_to_jiffies(10)); |
| } |
| |
| /* flush the SGE contexts */ |
| ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]); |
| if (ret) { |
| printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n", |
| pci_name(ctx->lldi.pdev)); |
| goto out; |
| } |
| |
| /* Count active queues so we can build a list of queues to recover */ |
| spin_lock_irq(&ctx->dev->lock); |
| idr_for_each(&ctx->dev->qpidr, count_qps, &count); |
| |
| qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC); |
| if (!qp_list.qps) { |
| printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n", |
| pci_name(ctx->lldi.pdev)); |
| spin_unlock_irq(&ctx->dev->lock); |
| goto out; |
| } |
| qp_list.idx = 0; |
| |
| /* add and ref each qp so it doesn't get freed */ |
| idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list); |
| |
| spin_unlock_irq(&ctx->dev->lock); |
| |
| /* now traverse the list in a safe context to recover the db state*/ |
| recover_lost_dbs(ctx, &qp_list); |
| |
| /* we're almost done! deref the qps and clean up */ |
| deref_qps(qp_list); |
| kfree(qp_list.qps); |
| |
| /* Wait for the dbfifo to completely drain again */ |
| while (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1) > 0) { |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| schedule_timeout(usecs_to_jiffies(10)); |
| } |
| |
| /* resume the queues */ |
| spin_lock_irq(&ctx->dev->lock); |
| if (ctx->dev->qpcnt > db_fc_threshold) |
| ctx->dev->db_state = FLOW_CONTROL; |
| else { |
| ctx->dev->db_state = NORMAL; |
| idr_for_each(&ctx->dev->qpidr, enable_qp_db, NULL); |
| } |
| ctx->dev->rdev.stats.db_state_transitions++; |
| spin_unlock_irq(&ctx->dev->lock); |
| |
| out: |
| /* start up kernel db ringers again */ |
| mutex_unlock(&ctx->dev->db_mutex); |
| } |
| |
| static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...) |
| { |
| struct uld_ctx *ctx = handle; |
| |
| switch (control) { |
| case CXGB4_CONTROL_DB_FULL: |
| stop_queues(ctx); |
| mutex_lock(&ctx->dev->rdev.stats.lock); |
| ctx->dev->rdev.stats.db_full++; |
| mutex_unlock(&ctx->dev->rdev.stats.lock); |
| break; |
| case CXGB4_CONTROL_DB_EMPTY: |
| resume_queues(ctx); |
| mutex_lock(&ctx->dev->rdev.stats.lock); |
| ctx->dev->rdev.stats.db_empty++; |
| mutex_unlock(&ctx->dev->rdev.stats.lock); |
| break; |
| case CXGB4_CONTROL_DB_DROP: |
| recover_queues(ctx); |
| mutex_lock(&ctx->dev->rdev.stats.lock); |
| ctx->dev->rdev.stats.db_drop++; |
| mutex_unlock(&ctx->dev->rdev.stats.lock); |
| break; |
| default: |
| printk(KERN_WARNING MOD "%s: unknown control cmd %u\n", |
| pci_name(ctx->lldi.pdev), control); |
| break; |
| } |
| return 0; |
| } |
| |
| static struct cxgb4_uld_info c4iw_uld_info = { |
| .name = DRV_NAME, |
| .add = c4iw_uld_add, |
| .rx_handler = c4iw_uld_rx_handler, |
| .state_change = c4iw_uld_state_change, |
| .control = c4iw_uld_control, |
| }; |
| |
| static int __init c4iw_init_module(void) |
| { |
| int err; |
| |
| err = c4iw_cm_init(); |
| if (err) |
| return err; |
| |
| c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL); |
| if (!c4iw_debugfs_root) |
| printk(KERN_WARNING MOD |
| "could not create debugfs entry, continuing\n"); |
| |
| cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info); |
| |
| return 0; |
| } |
| |
| static void __exit c4iw_exit_module(void) |
| { |
| struct uld_ctx *ctx, *tmp; |
| |
| mutex_lock(&dev_mutex); |
| list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) { |
| if (ctx->dev) |
| c4iw_remove(ctx); |
| kfree(ctx); |
| } |
| mutex_unlock(&dev_mutex); |
| cxgb4_unregister_uld(CXGB4_ULD_RDMA); |
| c4iw_cm_term(); |
| debugfs_remove_recursive(c4iw_debugfs_root); |
| } |
| |
| module_init(c4iw_init_module); |
| module_exit(c4iw_exit_module); |