struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, int npages) { struct rds_ib_mr_pool *pool; struct rds_ib_mr *ibmr = NULL; struct rds_ib_fmr *fmr; int err = 0; if (npages <= RDS_MR_8K_MSG_SIZE) pool = rds_ibdev->mr_8k_pool; else pool = rds_ibdev->mr_1m_pool; ibmr = rds_ib_try_reuse_ibmr(pool); if (ibmr) return ibmr; ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev)); if (!ibmr) { err = -ENOMEM; goto out_no_cigar; } fmr = &ibmr->u.fmr; fmr->fmr = ib_alloc_fmr(rds_ibdev->pd, (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC), &pool->fmr_attr); if (IS_ERR(fmr->fmr)) { err = PTR_ERR(fmr->fmr); fmr->fmr = NULL; pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, err); goto out_no_cigar; } ibmr->pool = pool; if (pool->pool_type == RDS_IB_MR_8K_POOL) rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); else rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); return ibmr; out_no_cigar: if (ibmr) { if (fmr->fmr) ib_dealloc_fmr(fmr->fmr); kfree(ibmr); } atomic_dec(&pool->item_count); return ERR_PTR(err); }
static struct rds_ib_mr *rds_ib_alloc_frmr(struct rds_ib_device *rds_ibdev, int npages) { struct rds_ib_mr_pool *pool; struct rds_ib_mr *ibmr = NULL; struct rds_ib_frmr *frmr; int err = 0; if (npages <= RDS_MR_8K_MSG_SIZE) pool = rds_ibdev->mr_8k_pool; else pool = rds_ibdev->mr_1m_pool; ibmr = rds_ib_try_reuse_ibmr(pool); if (ibmr) return ibmr; ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev)); if (!ibmr) { err = -ENOMEM; goto out_no_cigar; } frmr = &ibmr->u.frmr; frmr->mr = ib_alloc_mr(rds_ibdev->pd, IB_MR_TYPE_MEM_REG, pool->fmr_attr.max_pages); if (IS_ERR(frmr->mr)) { pr_warn("RDS/IB: %s failed to allocate MR", __func__); goto out_no_cigar; } ibmr->pool = pool; if (pool->pool_type == RDS_IB_MR_8K_POOL) rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); else rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); if (atomic_read(&pool->item_count) > pool->max_items_soft) pool->max_items_soft = pool->max_items; frmr->fr_state = FRMR_IS_FREE; return ibmr; out_no_cigar: kfree(ibmr); atomic_dec(&pool->item_count); return ERR_PTR(err); }
static void rds_ib_tasklet_fn_recv(unsigned long data) { struct rds_ib_connection *ic = (struct rds_ib_connection *)data; struct rds_connection *conn = ic->conn; struct rds_ib_device *rds_ibdev = ic->rds_ibdev; struct rds_ib_ack_state state; if (!rds_ibdev) rds_conn_drop(conn); rds_ib_stats_inc(s_ib_tasklet_call); memset(&state, 0, sizeof(state)); poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); if (state.ack_next_valid) rds_ib_set_ack(ic, state.ack_next, state.ack_required); if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) { rds_send_drop_acked(conn, state.ack_recv, NULL); ic->i_ack_recv = state.ack_recv; } if (rds_conn_up(conn)) rds_ib_attempt_ack(ic); }
static void rds_ib_send_unmap_atomic(struct rds_ib_connection *ic, struct rm_atomic_op *op, int wc_status) { /* unmap atomic recvbuf */ if (op->op_mapped) { ib_dma_unmap_sg(ic->i_cm_id->device, op->op_sg, 1, DMA_FROM_DEVICE); op->op_mapped = 0; } rds_ib_send_complete(container_of(op, struct rds_message, atomic), wc_status, rds_atomic_send_complete); if (op->op_type == RDS_ATOMIC_TYPE_CSWP) rds_ib_stats_inc(s_ib_atomic_cswp); else rds_ib_stats_inc(s_ib_atomic_fadd); }
static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context) { struct rds_connection *conn = context; struct rds_ib_connection *ic = conn->c_transport_data; rdsdebug("conn %p cq %p\n", conn, cq); rds_ib_stats_inc(s_ib_evt_handler_call); tasklet_schedule(&ic->i_send_tasklet); }
void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed, unsigned long *unpinned, unsigned int goal) { struct rds_ib_mr *ibmr, *next; struct rds_ib_frmr *frmr; int ret = 0; unsigned int freed = *nfreed; /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ list_for_each_entry(ibmr, list, unmap_list) { if (ibmr->sg_dma_len) ret |= rds_ib_post_inv(ibmr); } if (ret) pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret); /* Now we can destroy the DMA mapping and unpin any pages */ list_for_each_entry_safe(ibmr, next, list, unmap_list) { *unpinned += ibmr->sg_len; frmr = &ibmr->u.frmr; __rds_ib_teardown_mr(ibmr); if (freed < goal || frmr->fr_state == FRMR_IS_STALE) { /* Don't de-allocate if the MR is not free yet */ if (frmr->fr_state == FRMR_IS_INUSE) continue; if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) rds_ib_stats_inc(s_ib_rdma_mr_8k_free); else rds_ib_stats_inc(s_ib_rdma_mr_1m_free); list_del(&ibmr->unmap_list); if (frmr->mr) ib_dereg_mr(frmr->mr); kfree(ibmr); freed++; } }
static void rds_ib_tasklet_fn_send(unsigned long data) { struct rds_ib_connection *ic = (struct rds_ib_connection *)data; struct rds_connection *conn = ic->conn; rds_ib_stats_inc(s_ib_tasklet_call); poll_scq(ic, ic->i_send_cq, ic->i_send_wc); ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); poll_scq(ic, ic->i_send_cq, ic->i_send_wc); if (rds_conn_up(conn) && (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) || test_bit(0, &conn->c_map_queued))) rds_send_xmit(ic->conn); }
static void rds_ib_tasklet_fn_send(unsigned long data) { struct rds_ib_connection *ic = (struct rds_ib_connection *)data; struct rds_connection *conn = ic->conn; rds_ib_stats_inc(s_ib_tasklet_call); /* if cq has been already reaped, ignore incoming cq event */ if (atomic_read(&ic->i_cq_quiesce)) return; poll_scq(ic, ic->i_send_cq, ic->i_send_wc); ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); poll_scq(ic, ic->i_send_cq, ic->i_send_wc); if (rds_conn_up(conn) && (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) || test_bit(0, &conn->c_map_queued))) rds_send_xmit(&ic->conn->c_path[0]); }
/* * The _oldest/_free ring operations here race cleanly with the alloc/unalloc * operations performed in the send path. As the sender allocs and potentially * unallocs the next free entry in the ring it doesn't alter which is * the next to be freed, which is what this is concerned with. */ void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context) { struct rds_connection *conn = context; struct rds_ib_connection *ic = conn->c_transport_data; struct ib_wc wc; struct rds_ib_send_work *send; u32 completed; u32 oldest; u32 i = 0; int ret; rdsdebug("cq %p conn %p\n", cq, conn); rds_ib_stats_inc(s_ib_tx_cq_call); ret = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); if (ret) rdsdebug("ib_req_notify_cq send failed: %d\n", ret); while (ib_poll_cq(cq, 1, &wc) > 0) { rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", (unsigned long long)wc.wr_id, wc.status, wc.byte_len, be32_to_cpu(wc.ex.imm_data)); rds_ib_stats_inc(s_ib_tx_cq_event); if (wc.wr_id == RDS_IB_ACK_WR_ID) { if (ic->i_ack_queued + HZ/2 < jiffies) rds_ib_stats_inc(s_ib_tx_stalled); rds_ib_ack_send_complete(ic); continue; } oldest = rds_ib_ring_oldest(&ic->i_send_ring); completed = rds_ib_ring_completed(&ic->i_send_ring, wc.wr_id, oldest); for (i = 0; i < completed; i++) { send = &ic->i_sends[oldest]; /* In the error case, wc.opcode sometimes contains garbage */ switch (send->s_wr.opcode) { case IB_WR_SEND: if (send->s_rm) rds_ib_send_unmap_rm(ic, send, wc.status); break; case IB_WR_RDMA_WRITE: case IB_WR_RDMA_READ: /* Nothing to be done - the SG list will be unmapped * when the SEND completes. */ break; default: if (printk_ratelimit()) printk(KERN_NOTICE "RDS/IB: %s: unexpected opcode 0x%x in WR!\n", __func__, send->s_wr.opcode); break; } send->s_wr.opcode = 0xdead; send->s_wr.num_sge = 1; if (send->s_queued + HZ/2 < jiffies) rds_ib_stats_inc(s_ib_tx_stalled); /* If a RDMA operation produced an error, signal this right * away. If we don't, the subsequent SEND that goes with this * RDMA will be canceled with ERR_WFLUSH, and the application * never learn that the RDMA failed. */ if (unlikely(wc.status == IB_WC_REM_ACCESS_ERR && send->s_op)) { struct rds_message *rm; rm = rds_send_get_message(conn, send->s_op); if (rm) rds_ib_send_rdma_complete(rm, wc.status); } oldest = (oldest + 1) % ic->i_send_ring.w_nr; } rds_ib_ring_free(&ic->i_send_ring, completed); if (test_and_clear_bit(RDS_LL_SEND_FULL, &conn->c_flags) || test_bit(0, &conn->c_map_queued)) queue_delayed_work(rds_wq, &conn->c_send_w, 0); /* We expect errors as the qp is drained during shutdown */ if (wc.status != IB_WC_SUCCESS && rds_conn_up(conn)) { rds_ib_conn_error(conn, "send completion on %pI4 " "had status %u, disconnecting and reconnecting\n", &conn->c_faddr, wc.status); } } }
int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr, struct scatterlist *sg, unsigned int nents) { struct ib_device *dev = rds_ibdev->dev; struct rds_ib_fmr *fmr = &ibmr->u.fmr; struct scatterlist *scat = sg; u64 io_addr = 0; u64 *dma_pages; u32 len; int page_cnt, sg_dma_len; int i, j; int ret; sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL); if (unlikely(!sg_dma_len)) { pr_warn("RDS/IB: %s failed!\n", __func__); return -EBUSY; } len = 0; page_cnt = 0; for (i = 0; i < sg_dma_len; ++i) { unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); if (dma_addr & ~PAGE_MASK) { if (i > 0) return -EINVAL; else ++page_cnt; } if ((dma_addr + dma_len) & ~PAGE_MASK) { if (i < sg_dma_len - 1) return -EINVAL; else ++page_cnt; } len += dma_len; } page_cnt += len >> PAGE_SHIFT; if (page_cnt > ibmr->pool->fmr_attr.max_pages) return -EINVAL; dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC, rdsibdev_to_node(rds_ibdev)); if (!dma_pages) return -ENOMEM; page_cnt = 0; for (i = 0; i < sg_dma_len; ++i) { unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); for (j = 0; j < dma_len; j += PAGE_SIZE) dma_pages[page_cnt++] = (dma_addr & PAGE_MASK) + j; } ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr); if (ret) goto out; /* Success - we successfully remapped the MR, so we can * safely tear down the old mapping. */ rds_ib_teardown_mr(ibmr); ibmr->sg = scat; ibmr->sg_len = nents; ibmr->sg_dma_len = sg_dma_len; ibmr->remap_count++; if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) rds_ib_stats_inc(s_ib_rdma_mr_8k_used); else rds_ib_stats_inc(s_ib_rdma_mr_1m_used); ret = 0; out: kfree(dma_pages); return ret; }
static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr_pool *pool, struct rds_ib_mr *ibmr, struct scatterlist *sg, unsigned int sg_len) { struct ib_device *dev = rds_ibdev->dev; struct rds_ib_frmr *frmr = &ibmr->u.frmr; int i; u32 len; int ret = 0; /* We want to teardown old ibmr values here and fill it up with * new sg values */ rds_ib_teardown_mr(ibmr); ibmr->sg = sg; ibmr->sg_len = sg_len; ibmr->sg_dma_len = 0; frmr->sg_byte_len = 0; WARN_ON(ibmr->sg_dma_len); ibmr->sg_dma_len = ib_dma_map_sg(dev, ibmr->sg, ibmr->sg_len, DMA_BIDIRECTIONAL); if (unlikely(!ibmr->sg_dma_len)) { pr_warn("RDS/IB: %s failed!\n", __func__); return -EBUSY; } frmr->sg_byte_len = 0; frmr->dma_npages = 0; len = 0; ret = -EINVAL; for (i = 0; i < ibmr->sg_dma_len; ++i) { unsigned int dma_len = ib_sg_dma_len(dev, &ibmr->sg[i]); u64 dma_addr = ib_sg_dma_address(dev, &ibmr->sg[i]); frmr->sg_byte_len += dma_len; if (dma_addr & ~PAGE_MASK) { if (i > 0) goto out_unmap; else ++frmr->dma_npages; } if ((dma_addr + dma_len) & ~PAGE_MASK) { if (i < ibmr->sg_dma_len - 1) goto out_unmap; else ++frmr->dma_npages; } len += dma_len; } frmr->dma_npages += len >> PAGE_SHIFT; if (frmr->dma_npages > ibmr->pool->fmr_attr.max_pages) { ret = -EMSGSIZE; goto out_unmap; } ret = rds_ib_post_reg_frmr(ibmr); if (ret) goto out_unmap; if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) rds_ib_stats_inc(s_ib_rdma_mr_8k_used); else rds_ib_stats_inc(s_ib_rdma_mr_1m_used); return ret; out_unmap: ib_dma_unmap_sg(rds_ibdev->dev, ibmr->sg, ibmr->sg_len, DMA_BIDIRECTIONAL); ibmr->sg_dma_len = 0; return ret; }