From mboxrd@z Thu Jan 1 00:00:00 1970 From: Devesh Sharma Subject: [PATCH 3/5] libbnxt_re: move rts to rts after a threshold Date: Fri, 12 May 2017 06:24:24 -0400 Message-ID: <1494584666-11064-4-git-send-email-devesh.sharma@broadcom.com> References: <1494584666-11064-1-git-send-email-devesh.sharma@broadcom.com> Return-path: In-Reply-To: <1494584666-11064-1-git-send-email-devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org From: Somnath Kotur Due to a know bug, h/w is stopping UD-WQE processing after 0x800000 WQEs. Library needs to move the QP from RTS to RTS around half-way mark. This patch adds a simple wqe-counter and modfies the qp to circumvent the problem. Signed-off-by: Somnath Kotur Signed-off-by: Devesh Sharma --- providers/bnxt_re/main.h | 3 +++ providers/bnxt_re/verbs.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/providers/bnxt_re/main.h b/providers/bnxt_re/main.h index 4cc8abd..9688fec 100644 --- a/providers/bnxt_re/main.h +++ b/providers/bnxt_re/main.h @@ -54,6 +54,8 @@ #define DEV "bnxt_re : " +#define BNXT_RE_UD_QP_HW_STALL 0x400000 + struct bnxt_re_dpi { __u32 dpindx; __u64 *dbpage; @@ -113,6 +115,7 @@ struct bnxt_re_qp { uint32_t tbl_indx; uint32_t sq_psn; uint32_t pending_db; + uint64_t wqe_cnt; uint16_t mtu; uint16_t qpst; uint8_t qptyp; diff --git a/providers/bnxt_re/verbs.c b/providers/bnxt_re/verbs.c index 7cf0b86..abe4e2e 100644 --- a/providers/bnxt_re/verbs.c +++ b/providers/bnxt_re/verbs.c @@ -1240,8 +1240,20 @@ int bnxt_re_post_send(struct ibv_qp *ibvqp, struct ibv_send_wr *wr, bnxt_re_fill_wrid(wrid, wr, bytes, qp->cap.sqsig); bnxt_re_fill_psns(qp, psns, wr->opcode, bytes); bnxt_re_incr_tail(sq); + qp->wqe_cnt++; wr = wr->next; bnxt_re_ring_sq_db(qp); + if (qp->wqe_cnt == BNXT_RE_UD_QP_HW_STALL && qp->qptyp == + IBV_QPT_UD) { + /* Move RTS to RTS since it is time. */ + struct ibv_qp_attr attr; + int attr_mask; + + attr_mask = IBV_QP_STATE; + attr.qp_state = IBV_QPS_RTS; + bnxt_re_modify_qp(&qp->ibvqp, &attr, attr_mask); + qp->wqe_cnt = 0; + } } pthread_spin_unlock(&sq->qlock); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html