6.1-stable review patch. If anyone has any objections, please let me know.
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From: Selvin Xavier selvin.xavier@broadcom.com
[ Upstream commit 76d3ddff7153cc0bcc14a63798d19f5d0693ea71 ]
There is a race between the CREQ tasklet and destroy qp when accessing the qp-handle table. There is a chance of reading a valid qp-handle in the CREQ tasklet handler while the QP is already moving ahead with the destruction.
Fixing this race by implementing a table-lock to synchronize the access.
Fixes: f218d67ef004 ("RDMA/bnxt_re: Allow posting when QPs are in error") Fixes: 84cf229f4001 ("RDMA/bnxt_re: Fix the qp table indexing") Link: https://patch.msgid.link/r/1728912975-19346-3-git-send-email-selvin.xavier@b... Signed-off-by: Kalesh AP kalesh-anakkur.purayil@broadcom.com Signed-off-by: Selvin Xavier selvin.xavier@broadcom.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/bnxt_re/qplib_fp.c | 4 ++++ drivers/infiniband/hw/bnxt_re/qplib_rcfw.c | 13 +++++++++---- drivers/infiniband/hw/bnxt_re/qplib_rcfw.h | 2 ++ 3 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_fp.c b/drivers/infiniband/hw/bnxt_re/qplib_fp.c index 1011293547ef7..3a5c58694e075 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c @@ -1496,9 +1496,11 @@ int bnxt_qplib_destroy_qp(struct bnxt_qplib_res *res, u32 tbl_indx; int rc;
+ spin_lock_bh(&rcfw->tbl_lock); tbl_indx = map_qp_id_to_tbl_indx(qp->id, rcfw); rcfw->qp_tbl[tbl_indx].qp_id = BNXT_QPLIB_QP_ID_INVALID; rcfw->qp_tbl[tbl_indx].qp_handle = NULL; + spin_unlock_bh(&rcfw->tbl_lock);
RCFW_CMD_PREP(req, DESTROY_QP, cmd_flags);
@@ -1506,8 +1508,10 @@ int bnxt_qplib_destroy_qp(struct bnxt_qplib_res *res, rc = bnxt_qplib_rcfw_send_message(rcfw, (void *)&req, (void *)&resp, NULL, 0); if (rc) { + spin_lock_bh(&rcfw->tbl_lock); rcfw->qp_tbl[tbl_indx].qp_id = qp->id; rcfw->qp_tbl[tbl_indx].qp_handle = qp; + spin_unlock_bh(&rcfw->tbl_lock); return rc; }
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c index 14c9af41faa67..c03475b9fa288 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c +++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c @@ -320,17 +320,21 @@ static int bnxt_qplib_process_qp_event(struct bnxt_qplib_rcfw *rcfw, case CREQ_QP_EVENT_EVENT_QP_ERROR_NOTIFICATION: err_event = (struct creq_qp_error_notification *)qp_event; qp_id = le32_to_cpu(err_event->xid); + spin_lock(&rcfw->tbl_lock); tbl_indx = map_qp_id_to_tbl_indx(qp_id, rcfw); qp = rcfw->qp_tbl[tbl_indx].qp_handle; + if (!qp) { + spin_unlock(&rcfw->tbl_lock); + break; + } + bnxt_qplib_mark_qp_error(qp); + rc = rcfw->creq.aeq_handler(rcfw, qp_event, qp); + spin_unlock(&rcfw->tbl_lock); dev_dbg(&pdev->dev, "Received QP error notification\n"); dev_dbg(&pdev->dev, "qpid 0x%x, req_err=0x%x, resp_err=0x%x\n", qp_id, err_event->req_err_state_reason, err_event->res_err_state_reason); - if (!qp) - break; - bnxt_qplib_mark_qp_error(qp); - rc = rcfw->creq.aeq_handler(rcfw, qp_event, qp); break; default: /* @@ -629,6 +633,7 @@ int bnxt_qplib_alloc_rcfw_channel(struct bnxt_qplib_res *res, GFP_KERNEL); if (!rcfw->qp_tbl) goto fail; + spin_lock_init(&rcfw->tbl_lock);
return 0;
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h index b887e7fbad9ef..9c28f4625c920 100644 --- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h +++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.h @@ -186,6 +186,8 @@ struct bnxt_qplib_rcfw { struct bnxt_qplib_crsqe *crsqe_tbl; int qp_tbl_size; struct bnxt_qplib_qp_node *qp_tbl; + /* To synchronize the qp-handle hash table */ + spinlock_t tbl_lock; u64 oos_prev; u32 init_oos_stats; u32 cmdq_depth;