IB/srp: use the new CQ API
This also moves recv completion handling from hardirq context into softirq context. Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
parent
59fae4deaa
commit
1dc7b1f10d
@ -132,8 +132,9 @@ MODULE_PARM_DESC(ch_count,
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static void srp_add_one(struct ib_device *device);
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static void srp_remove_one(struct ib_device *device, void *client_data);
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static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr);
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static void srp_send_completion(struct ib_cq *cq, void *ch_ptr);
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static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);
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static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
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const char *opname);
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static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
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static struct scsi_transport_template *ib_srp_transport_template;
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@ -445,6 +446,17 @@ static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
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dev->max_pages_per_mr);
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}
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static void srp_drain_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct srp_rdma_ch *ch = cq->cq_context;
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complete(&ch->done);
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}
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static struct ib_cqe srp_drain_cqe = {
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.done = srp_drain_done,
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};
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/**
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* srp_destroy_qp() - destroy an RDMA queue pair
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* @ch: SRP RDMA channel.
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@ -461,7 +473,7 @@ static void srp_destroy_qp(struct srp_rdma_ch *ch)
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struct ib_recv_wr *bad_wr;
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int ret;
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wr.wr_id = SRP_LAST_WR_ID;
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wr.wr_cqe = &srp_drain_cqe;
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/* Destroying a QP and reusing ch->done is only safe if not connected */
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WARN_ON_ONCE(ch->connected);
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@ -490,34 +502,27 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
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struct ib_fmr_pool *fmr_pool = NULL;
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struct srp_fr_pool *fr_pool = NULL;
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const int m = 1 + dev->use_fast_reg;
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struct ib_cq_init_attr cq_attr = {};
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int ret;
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init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
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if (!init_attr)
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return -ENOMEM;
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/* + 1 for SRP_LAST_WR_ID */
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cq_attr.cqe = target->queue_size + 1;
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cq_attr.comp_vector = ch->comp_vector;
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recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, ch,
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&cq_attr);
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/* queue_size + 1 for ib_drain_qp */
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recv_cq = ib_alloc_cq(dev->dev, ch, target->queue_size + 1,
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ch->comp_vector, IB_POLL_SOFTIRQ);
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if (IS_ERR(recv_cq)) {
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ret = PTR_ERR(recv_cq);
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goto err;
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}
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cq_attr.cqe = m * target->queue_size;
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cq_attr.comp_vector = ch->comp_vector;
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send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, ch,
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&cq_attr);
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send_cq = ib_alloc_cq(dev->dev, ch, m * target->queue_size,
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ch->comp_vector, IB_POLL_DIRECT);
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if (IS_ERR(send_cq)) {
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ret = PTR_ERR(send_cq);
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goto err_recv_cq;
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}
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ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
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init_attr->event_handler = srp_qp_event;
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init_attr->cap.max_send_wr = m * target->queue_size;
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init_attr->cap.max_recv_wr = target->queue_size + 1;
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@ -559,9 +564,9 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
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if (ch->qp)
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srp_destroy_qp(ch);
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if (ch->recv_cq)
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ib_destroy_cq(ch->recv_cq);
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ib_free_cq(ch->recv_cq);
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if (ch->send_cq)
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ib_destroy_cq(ch->send_cq);
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ib_free_cq(ch->send_cq);
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ch->qp = qp;
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ch->recv_cq = recv_cq;
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@ -581,13 +586,13 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
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return 0;
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err_qp:
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ib_destroy_qp(qp);
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srp_destroy_qp(ch);
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err_send_cq:
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ib_destroy_cq(send_cq);
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ib_free_cq(send_cq);
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err_recv_cq:
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ib_destroy_cq(recv_cq);
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ib_free_cq(recv_cq);
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err:
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kfree(init_attr);
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@ -623,9 +628,10 @@ static void srp_free_ch_ib(struct srp_target_port *target,
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if (ch->fmr_pool)
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ib_destroy_fmr_pool(ch->fmr_pool);
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}
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srp_destroy_qp(ch);
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ib_destroy_cq(ch->send_cq);
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ib_destroy_cq(ch->recv_cq);
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ib_free_cq(ch->send_cq);
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ib_free_cq(ch->recv_cq);
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/*
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* Avoid that the SCSI error handler tries to use this channel after
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@ -1038,7 +1044,13 @@ static int srp_connect_ch(struct srp_rdma_ch *ch, bool multich)
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}
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}
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static int srp_inv_rkey(struct srp_rdma_ch *ch, u32 rkey)
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static void srp_inv_rkey_err_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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srp_handle_qp_err(cq, wc, "INV RKEY");
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}
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static int srp_inv_rkey(struct srp_request *req, struct srp_rdma_ch *ch,
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u32 rkey)
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{
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struct ib_send_wr *bad_wr;
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struct ib_send_wr wr = {
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@ -1049,8 +1061,8 @@ static int srp_inv_rkey(struct srp_rdma_ch *ch, u32 rkey)
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.ex.invalidate_rkey = rkey,
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};
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wr.wr_id = LOCAL_INV_WR_ID_MASK;
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wr.wr_cqe = &req->reg_cqe;
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req->reg_cqe.done = srp_inv_rkey_err_done;
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return ib_post_send(ch->qp, &wr, &bad_wr);
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}
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@ -1072,7 +1084,7 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
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struct srp_fr_desc **pfr;
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for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
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res = srp_inv_rkey(ch, (*pfr)->mr->rkey);
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res = srp_inv_rkey(req, ch, (*pfr)->mr->rkey);
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if (res < 0) {
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shost_printk(KERN_ERR, target->scsi_host, PFX
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"Queueing INV WR for rkey %#x failed (%d)\n",
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@ -1310,7 +1322,13 @@ reset_state:
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return 0;
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}
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static void srp_reg_mr_err_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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srp_handle_qp_err(cq, wc, "FAST REG");
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}
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static int srp_map_finish_fr(struct srp_map_state *state,
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struct srp_request *req,
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struct srp_rdma_ch *ch)
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{
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struct srp_target_port *target = ch->target;
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@ -1348,9 +1366,11 @@ static int srp_map_finish_fr(struct srp_map_state *state,
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if (unlikely(n < 0))
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return n;
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req->reg_cqe.done = srp_reg_mr_err_done;
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wr.wr.next = NULL;
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wr.wr.opcode = IB_WR_REG_MR;
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wr.wr.wr_id = FAST_REG_WR_ID_MASK;
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wr.wr.wr_cqe = &req->reg_cqe;
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wr.wr.num_sge = 0;
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wr.wr.send_flags = 0;
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wr.mr = desc->mr;
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@ -1455,7 +1475,7 @@ static int srp_map_sg_fr(struct srp_map_state *state, struct srp_rdma_ch *ch,
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while (state->sg_nents) {
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int i, n;
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n = srp_map_finish_fr(state, ch);
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n = srp_map_finish_fr(state, req, ch);
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if (unlikely(n < 0))
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return n;
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@ -1522,7 +1542,7 @@ static int srp_map_idb(struct srp_rdma_ch *ch, struct srp_request *req,
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state.sg_nents = 1;
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sg_set_buf(idb_sg, req->indirect_desc, idb_len);
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idb_sg->dma_address = req->indirect_dma_addr; /* hack! */
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ret = srp_map_finish_fr(&state, ch);
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ret = srp_map_finish_fr(&state, req, ch);
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if (ret < 0)
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return ret;
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} else if (dev->use_fmr) {
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@ -1717,7 +1737,7 @@ static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
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s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
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struct srp_iu *iu;
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srp_send_completion(ch->send_cq, ch);
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ib_process_cq_direct(ch->send_cq, -1);
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if (list_empty(&ch->free_tx))
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return NULL;
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@ -1737,6 +1757,19 @@ static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
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return iu;
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}
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static void srp_send_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct srp_iu *iu = container_of(wc->wr_cqe, struct srp_iu, cqe);
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struct srp_rdma_ch *ch = cq->cq_context;
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if (unlikely(wc->status != IB_WC_SUCCESS)) {
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srp_handle_qp_err(cq, wc, "SEND");
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return;
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}
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list_add(&iu->list, &ch->free_tx);
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}
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static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
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{
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struct srp_target_port *target = ch->target;
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@ -1747,8 +1780,10 @@ static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
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list.length = len;
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list.lkey = target->lkey;
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iu->cqe.done = srp_send_done;
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wr.next = NULL;
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wr.wr_id = (uintptr_t) iu;
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wr.wr_cqe = &iu->cqe;
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wr.sg_list = &list;
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wr.num_sge = 1;
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wr.opcode = IB_WR_SEND;
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@ -1767,8 +1802,10 @@ static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)
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list.length = iu->size;
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list.lkey = target->lkey;
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iu->cqe.done = srp_recv_done;
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wr.next = NULL;
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wr.wr_id = (uintptr_t) iu;
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wr.wr_cqe = &iu->cqe;
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wr.sg_list = &list;
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wr.num_sge = 1;
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@ -1900,14 +1937,20 @@ static void srp_process_aer_req(struct srp_rdma_ch *ch,
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"problems processing SRP_AER_REQ\n");
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}
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static void srp_handle_recv(struct srp_rdma_ch *ch, struct ib_wc *wc)
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static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct srp_iu *iu = container_of(wc->wr_cqe, struct srp_iu, cqe);
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struct srp_rdma_ch *ch = cq->cq_context;
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struct srp_target_port *target = ch->target;
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struct ib_device *dev = target->srp_host->srp_dev->dev;
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struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
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int res;
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u8 opcode;
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if (unlikely(wc->status != IB_WC_SUCCESS)) {
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srp_handle_qp_err(cq, wc, "RECV");
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return;
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}
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ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
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DMA_FROM_DEVICE);
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@ -1970,68 +2013,22 @@ static void srp_tl_err_work(struct work_struct *work)
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srp_start_tl_fail_timers(target->rport);
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}
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static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
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bool send_err, struct srp_rdma_ch *ch)
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static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
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const char *opname)
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{
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struct srp_rdma_ch *ch = cq->cq_context;
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struct srp_target_port *target = ch->target;
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if (wr_id == SRP_LAST_WR_ID) {
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complete(&ch->done);
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return;
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}
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if (ch->connected && !target->qp_in_error) {
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if (wr_id & LOCAL_INV_WR_ID_MASK) {
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shost_printk(KERN_ERR, target->scsi_host, PFX
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"LOCAL_INV failed with status %s (%d)\n",
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ib_wc_status_msg(wc_status), wc_status);
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} else if (wr_id & FAST_REG_WR_ID_MASK) {
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shost_printk(KERN_ERR, target->scsi_host, PFX
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"FAST_REG_MR failed status %s (%d)\n",
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ib_wc_status_msg(wc_status), wc_status);
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} else {
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shost_printk(KERN_ERR, target->scsi_host,
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PFX "failed %s status %s (%d) for iu %p\n",
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send_err ? "send" : "receive",
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ib_wc_status_msg(wc_status), wc_status,
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(void *)(uintptr_t)wr_id);
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}
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shost_printk(KERN_ERR, target->scsi_host,
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PFX "failed %s status %s (%d) for CQE %p\n",
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opname, ib_wc_status_msg(wc->status), wc->status,
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wc->wr_cqe);
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queue_work(system_long_wq, &target->tl_err_work);
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}
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target->qp_in_error = true;
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}
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static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr)
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{
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struct srp_rdma_ch *ch = ch_ptr;
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struct ib_wc wc;
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ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
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while (ib_poll_cq(cq, 1, &wc) > 0) {
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if (likely(wc.status == IB_WC_SUCCESS)) {
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srp_handle_recv(ch, &wc);
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} else {
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srp_handle_qp_err(wc.wr_id, wc.status, false, ch);
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}
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}
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}
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static void srp_send_completion(struct ib_cq *cq, void *ch_ptr)
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{
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struct srp_rdma_ch *ch = ch_ptr;
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struct ib_wc wc;
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struct srp_iu *iu;
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while (ib_poll_cq(cq, 1, &wc) > 0) {
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if (likely(wc.status == IB_WC_SUCCESS)) {
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iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
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list_add(&iu->list, &ch->free_tx);
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} else {
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srp_handle_qp_err(wc.wr_id, wc.status, true, ch);
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}
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}
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}
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static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
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{
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struct srp_target_port *target = host_to_target(shost);
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@ -3585,8 +3582,6 @@ static int __init srp_init_module(void)
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{
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int ret;
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BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
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if (srp_sg_tablesize) {
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pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
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if (!cmd_sg_entries)
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@ -66,11 +66,6 @@ enum {
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SRP_TAG_TSK_MGMT = 1U << 31,
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SRP_MAX_PAGES_PER_MR = 512,
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LOCAL_INV_WR_ID_MASK = 1,
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FAST_REG_WR_ID_MASK = 2,
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SRP_LAST_WR_ID = 0xfffffffcU,
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};
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enum srp_target_state {
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@ -128,6 +123,7 @@ struct srp_request {
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struct srp_direct_buf *indirect_desc;
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dma_addr_t indirect_dma_addr;
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short nmdesc;
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struct ib_cqe reg_cqe;
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};
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/**
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@ -231,6 +227,7 @@ struct srp_iu {
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void *buf;
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size_t size;
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enum dma_data_direction direction;
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struct ib_cqe cqe;
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};
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/**
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