From ba97b749979ef0ebb821e58ee8b16a84412922f6 Mon Sep 17 00:00:00 2001 From: Steve Wise Date: Thu, 2 Nov 2017 14:11:03 -0700 Subject: [PATCH] iw_cxgb4: remove BUG_ON() usage. iw_cxgb4 has many BUG_ON()s that were left over from various enhancemnets made over the years. Almost all of them should just be removed. Some, however indicate a ULP usage error and can be handled w/o bringing down the system. If the condition cannot happen with correctly implemented cxgb4 sw/fw, then remove the BUG_ON. If the condition indicates a misbehaving ULP (like CQ overflows), add proper recovery logic. Signed-off-by: Steve Wise Reviewed-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/hw/cxgb4/cm.c | 25 +++++++++---------------- drivers/infiniband/hw/cxgb4/cq.c | 10 ---------- drivers/infiniband/hw/cxgb4/id_table.c | 1 - drivers/infiniband/hw/cxgb4/iw_cxgb4.h | 1 - drivers/infiniband/hw/cxgb4/provider.c | 4 ++-- drivers/infiniband/hw/cxgb4/qp.c | 3 --- drivers/infiniband/hw/cxgb4/t4.h | 7 ++----- 7 files changed, 13 insertions(+), 38 deletions(-) diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index 7eb8a85e4d42..21db3b48a617 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -912,8 +912,6 @@ static int send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb, pr_debug("ep %p tid %u pd_len %d\n", ep, ep->hwtid, ep->plen); - BUG_ON(skb_cloned(skb)); - mpalen = sizeof(*mpa) + ep->plen; if (mpa_rev_to_use == 2) mpalen += sizeof(struct mpa_v2_conn_params); @@ -996,7 +994,6 @@ static int send_mpa_req(struct c4iw_ep *ep, struct sk_buff *skb, */ skb_get(skb); t4_set_arp_err_handler(skb, NULL, arp_failure_discard); - BUG_ON(ep->mpa_skb); ep->mpa_skb = skb; ret = c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t); if (ret) @@ -1082,7 +1079,6 @@ static int send_mpa_reject(struct c4iw_ep *ep, const void *pdata, u8 plen) skb_get(skb); set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx); t4_set_arp_err_handler(skb, NULL, mpa_start_arp_failure); - BUG_ON(ep->mpa_skb); ep->mpa_skb = skb; ep->snd_seq += mpalen; return c4iw_l2t_send(&ep->com.dev->rdev, skb, ep->l2t); @@ -1836,7 +1832,6 @@ static int rx_data(struct c4iw_dev *dev, struct sk_buff *skb) struct c4iw_qp_attributes attrs; update_rx_credits(ep, dlen); - BUG_ON(!ep->com.qp); if (status) pr_err("%s Unexpected streaming data." \ " qpid %u ep %p state %d tid %u status %d\n", @@ -2109,7 +2104,7 @@ static int c4iw_reconnect(struct c4iw_ep *ep) * further connection establishment. As we are using the same EP pointer * for reconnect, few skbs are used during the previous c4iw_connect(), * which leaves the EP with inadequate skbs for further - * c4iw_reconnect(), Further causing an assert BUG_ON() due to empty + * c4iw_reconnect(), Further causing a crash due to an empty * skb_list() during peer_abort(). Allocate skbs which is already used. */ size = (CN_MAX_CON_BUF - skb_queue_len(&ep->com.ep_skb_list)); @@ -2356,7 +2351,6 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, enum chip_type adapter_type = ep->com.dev->rdev.lldi.adapter_type; pr_debug("ep %p tid %u\n", ep, ep->hwtid); - BUG_ON(skb_cloned(skb)); skb_get(skb); rpl = cplhdr(skb); @@ -2440,7 +2434,6 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, static void reject_cr(struct c4iw_dev *dev, u32 hwtid, struct sk_buff *skb) { pr_debug("c4iw_dev %p tid %u\n", dev, hwtid); - BUG_ON(skb_cloned(skb)); skb_trim(skb, sizeof(struct cpl_tid_release)); release_tid(&dev->rdev, hwtid, skb); return; @@ -2713,7 +2706,7 @@ static int peer_close(struct c4iw_dev *dev, struct sk_buff *skb) disconnect = 0; break; default: - BUG_ON(1); + WARN_ONCE(1, "Bad endpoint state %u\n", ep->com.state); } mutex_unlock(&ep->com.mutex); if (disconnect) @@ -2813,7 +2806,7 @@ static int peer_abort(struct c4iw_dev *dev, struct sk_buff *skb) mutex_unlock(&ep->com.mutex); goto deref_ep; default: - BUG_ON(1); + WARN_ONCE(1, "Bad endpoint state %u\n", ep->com.state); break; } dst_confirm(ep->dst); @@ -2900,7 +2893,7 @@ static int close_con_rpl(struct c4iw_dev *dev, struct sk_buff *skb) case DEAD: break; default: - BUG_ON(1); + WARN_ONCE(1, "Bad endpoint state %u\n", ep->com.state); break; } mutex_unlock(&ep->com.mutex); @@ -2918,7 +2911,6 @@ static int terminate(struct c4iw_dev *dev, struct sk_buff *skb) struct c4iw_qp_attributes attrs; ep = get_ep_from_tid(dev, tid); - BUG_ON(!ep); if (ep && ep->com.qp) { pr_warn("TERM received tid %u qpid %u\n", @@ -3018,7 +3010,10 @@ int c4iw_accept_cr(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param) goto err_out; } - BUG_ON(!qp); + if (!qp) { + err = -EINVAL; + goto err_out; + } set_bit(ULP_ACCEPT, &ep->com.history); if ((conn_param->ord > cur_max_read_depth(ep->com.dev)) || @@ -3576,7 +3571,7 @@ int c4iw_ep_disconnect(struct c4iw_ep *ep, int abrupt, gfp_t gfp) __func__, ep, ep->com.state); break; default: - BUG(); + WARN_ONCE(1, "Bad endpoint state %u\n", ep->com.state); break; } @@ -3676,7 +3671,6 @@ static void passive_ofld_conn_reply(struct c4iw_dev *dev, struct sk_buff *skb, int ret; rpl_skb = (struct sk_buff *)(unsigned long)req->cookie; - BUG_ON(!rpl_skb); if (req->retval) { pr_err("%s passive open failure %d\n", __func__, req->retval); mutex_lock(&dev->rdev.stats.lock); @@ -4103,7 +4097,6 @@ static void process_work(struct work_struct *work) dev = *((struct c4iw_dev **) (skb->cb + sizeof(void *))); opcode = rpl->ot.opcode; - BUG_ON(!work_handlers[opcode]); ret = work_handlers[opcode](dev, skb); if (!ret) kfree_skb(skb); diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c index 8e2d490e757a..ea55e95cd2c5 100644 --- a/drivers/infiniband/hw/cxgb4/cq.c +++ b/drivers/infiniband/hw/cxgb4/cq.c @@ -188,7 +188,6 @@ int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count) int flushed = 0; int in_use = wq->rq.in_use - count; - BUG_ON(in_use < 0); pr_debug("wq %p cq %p rq.in_use %u skip count %u\n", wq, cq, wq->rq.in_use, count); while (in_use--) { @@ -231,14 +230,11 @@ int c4iw_flush_sq(struct c4iw_qp *qhp) if (wq->sq.flush_cidx == -1) wq->sq.flush_cidx = wq->sq.cidx; idx = wq->sq.flush_cidx; - BUG_ON(idx >= wq->sq.size); while (idx != wq->sq.pidx) { swsqe = &wq->sq.sw_sq[idx]; - BUG_ON(swsqe->flushed); swsqe->flushed = 1; insert_sq_cqe(wq, cq, swsqe); if (wq->sq.oldest_read == swsqe) { - BUG_ON(swsqe->opcode != FW_RI_READ_REQ); advance_oldest_read(wq); } flushed++; @@ -259,7 +255,6 @@ static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq) if (wq->sq.flush_cidx == -1) wq->sq.flush_cidx = wq->sq.cidx; cidx = wq->sq.flush_cidx; - BUG_ON(cidx > wq->sq.size); while (cidx != wq->sq.pidx) { swsqe = &wq->sq.sw_sq[cidx]; @@ -268,8 +263,6 @@ static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq) cidx = 0; } else if (swsqe->complete) { - BUG_ON(swsqe->flushed); - /* * Insert this completed cqe into the swcq. */ @@ -613,7 +606,6 @@ proc_cqe: */ if (SQ_TYPE(hw_cqe)) { int idx = CQE_WRID_SQ_IDX(hw_cqe); - BUG_ON(idx >= wq->sq.size); /* * Account for any unsignaled completions completed by @@ -627,7 +619,6 @@ proc_cqe: wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx; else wq->sq.in_use -= idx - wq->sq.cidx; - BUG_ON(wq->sq.in_use <= 0 && wq->sq.in_use >= wq->sq.size); wq->sq.cidx = (uint16_t)idx; pr_debug("completing sq idx %u\n", wq->sq.cidx); @@ -638,7 +629,6 @@ proc_cqe: } else { pr_debug("completing rq idx %u\n", wq->rq.cidx); *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id; - BUG_ON(t4_rq_empty(wq)); if (c4iw_wr_log) c4iw_log_wr_stats(wq, hw_cqe); t4_rq_consume(wq); diff --git a/drivers/infiniband/hw/cxgb4/id_table.c b/drivers/infiniband/hw/cxgb4/id_table.c index 0161ae6ad629..5c2cfdea06ad 100644 --- a/drivers/infiniband/hw/cxgb4/id_table.c +++ b/drivers/infiniband/hw/cxgb4/id_table.c @@ -73,7 +73,6 @@ void c4iw_id_free(struct c4iw_id_table *alloc, u32 obj) unsigned long flags; obj -= alloc->start; - BUG_ON((int)obj < 0); spin_lock_irqsave(&alloc->lock, flags); clear_bit(obj, alloc->table); diff --git a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h index 788ddb6aa57b..8d525825d50c 100644 --- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h +++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h @@ -364,7 +364,6 @@ static inline int _insert_handle(struct c4iw_dev *rhp, struct idr *idr, idr_preload_end(); } - BUG_ON(ret == -ENOSPC); return ret < 0 ? ret : 0; } diff --git a/drivers/infiniband/hw/cxgb4/provider.c b/drivers/infiniband/hw/cxgb4/provider.c index fb99a05562a3..30206a57dbe7 100644 --- a/drivers/infiniband/hw/cxgb4/provider.c +++ b/drivers/infiniband/hw/cxgb4/provider.c @@ -310,8 +310,9 @@ static int c4iw_query_gid(struct ib_device *ibdev, u8 port, int index, pr_debug("ibdev %p, port %d, index %d, gid %p\n", ibdev, port, index, gid); + if (!port) + return -EINVAL; dev = to_c4iw_dev(ibdev); - BUG_ON(port == 0); memset(&(gid->raw[0]), 0, sizeof(gid->raw)); memcpy(&(gid->raw[0]), dev->rdev.lldi.ports[port-1]->dev_addr, 6); return 0; @@ -536,7 +537,6 @@ int c4iw_register_device(struct c4iw_dev *dev) int i; pr_debug("c4iw_dev %p\n", dev); - BUG_ON(!dev->rdev.lldi.ports[0]); strlcpy(dev->ibdev.name, "cxgb4_%d", IB_DEVICE_NAME_MAX); memset(&dev->ibdev.node_guid, 0, sizeof(dev->ibdev.node_guid)); memcpy(&dev->ibdev.node_guid, dev->rdev.lldi.ports[0]->dev_addr, 6); diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c index 4b3267358dff..1374b41201a9 100644 --- a/drivers/infiniband/hw/cxgb4/qp.c +++ b/drivers/infiniband/hw/cxgb4/qp.c @@ -689,7 +689,6 @@ static int build_memreg(struct t4_sq *sq, union t4_wr *wqe, if (++p == (__be64 *)&sq->queue[sq->size]) p = (__be64 *)sq->queue; } - BUG_ON(rem < 0); while (rem) { *p = 0; rem -= sizeof(*p); @@ -1568,7 +1567,6 @@ int c4iw_modify_qp(struct c4iw_dev *rhp, struct c4iw_qp *qhp, case C4IW_QP_STATE_RTS: switch (attrs->next_state) { case C4IW_QP_STATE_CLOSING: - BUG_ON(kref_read(&qhp->ep->com.kref) < 2); t4_set_wq_in_error(&qhp->wq); set_state(qhp, C4IW_QP_STATE_CLOSING); ep = qhp->ep; @@ -1677,7 +1675,6 @@ err: set_state(qhp, C4IW_QP_STATE_ERROR); free = 1; abort = 1; - BUG_ON(!ep); flush_qp(qhp); wake_up(&qhp->wait); out: diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h index 427aaf20d77c..e9ea94268d51 100644 --- a/drivers/infiniband/hw/cxgb4/t4.h +++ b/drivers/infiniband/hw/cxgb4/t4.h @@ -425,7 +425,6 @@ static inline void t4_sq_produce(struct t4_wq *wq, u8 len16) static inline void t4_sq_consume(struct t4_wq *wq) { - BUG_ON(wq->sq.in_use < 1); if (wq->sq.cidx == wq->sq.flush_cidx) wq->sq.flush_cidx = -1; wq->sq.in_use--; @@ -600,7 +599,8 @@ static inline void t4_swcq_produce(struct t4_cq *cq) pr_warn("%s cxgb4 sw cq overflow cqid %u\n", __func__, cq->cqid); cq->error = 1; - BUG_ON(1); + cq->sw_in_use--; + return; } if (++cq->sw_pidx == cq->size) cq->sw_pidx = 0; @@ -608,7 +608,6 @@ static inline void t4_swcq_produce(struct t4_cq *cq) static inline void t4_swcq_consume(struct t4_cq *cq) { - BUG_ON(cq->sw_in_use < 1); cq->sw_in_use--; if (++cq->sw_cidx == cq->size) cq->sw_cidx = 0; @@ -654,7 +653,6 @@ static inline int t4_next_hw_cqe(struct t4_cq *cq, struct t4_cqe **cqe) ret = -EOVERFLOW; cq->error = 1; pr_err("cq overflow cqid %u\n", cq->cqid); - BUG_ON(1); } else if (t4_valid_cqe(cq, &cq->queue[cq->cidx])) { /* Ensure CQE is flushed to memory */ @@ -672,7 +670,6 @@ static inline struct t4_cqe *t4_next_sw_cqe(struct t4_cq *cq) pr_warn("%s cxgb4 sw cq overflow cqid %u\n", __func__, cq->cqid); cq->error = 1; - BUG_ON(1); return NULL; } if (cq->sw_in_use) -- 2.25.1