From 942a899335707fc9cfc97cb382a60734b2ff4e03 Mon Sep 17 00:00:00 2001 From: Mike Marciniszyn Date: Fri, 14 Jun 2019 12:33:06 -0400 Subject: [PATCH] IB/hfi1: Handle port down properly in pio The call to sc_buffer_alloc currently returns NULL (no buffer) or a buffer descriptor. There is a third case when the port is down. Currently that returns NULL and this prevents the caller from properly handling the sc_buffer_alloc() failure. A verbs code link test after the call is racy so the indication needs to come from the state check inside the allocation routine to be valid. Fix by encoding the ECOMM failure like SDMA. IS_ERR_OR_NULL() tests are added at all call sites. For verbs send, this needs to treat any error by returning a completion without any MMIO copy. Fixes: 7724105686e7 ("IB/hfi1: add driver files") Reviewed-by: Dennis Dalessandro Signed-off-by: Mike Marciniszyn Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/hw/hfi1/pio.c | 5 +++-- drivers/infiniband/hw/hfi1/rc.c | 2 +- drivers/infiniband/hw/hfi1/ud.c | 4 ++-- drivers/infiniband/hw/hfi1/verbs.c | 4 ++-- 4 files changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/pio.c b/drivers/infiniband/hw/hfi1/pio.c index 66cf2b17e519..4e5c2d1b8cfa 100644 --- a/drivers/infiniband/hw/hfi1/pio.c +++ b/drivers/infiniband/hw/hfi1/pio.c @@ -1443,7 +1443,8 @@ void sc_stop(struct send_context *sc, int flag) * @cb: optional callback to call when the buffer is finished sending * @arg: argument for cb * - * Return a pointer to a PIO buffer if successful, NULL if not enough room. + * Return a pointer to a PIO buffer, NULL if not enough room, -ECOMM + * when link is down. */ struct pio_buf *sc_buffer_alloc(struct send_context *sc, u32 dw_len, pio_release_cb cb, void *arg) @@ -1459,7 +1460,7 @@ struct pio_buf *sc_buffer_alloc(struct send_context *sc, u32 dw_len, spin_lock_irqsave(&sc->alloc_lock, flags); if (!(sc->flags & SCF_ENABLED)) { spin_unlock_irqrestore(&sc->alloc_lock, flags); - goto done; + return ERR_PTR(-ECOMM); } retry: diff --git a/drivers/infiniband/hw/hfi1/rc.c b/drivers/infiniband/hw/hfi1/rc.c index 6684ec333525..7c8cfb149da0 100644 --- a/drivers/infiniband/hw/hfi1/rc.c +++ b/drivers/infiniband/hw/hfi1/rc.c @@ -1432,7 +1432,7 @@ void hfi1_send_rc_ack(struct hfi1_packet *packet, bool is_fecn) pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, sc_to_vlt(ppd->dd, sc5), plen); pbuf = sc_buffer_alloc(rcd->sc, plen, NULL, NULL); - if (!pbuf) { + if (IS_ERR_OR_NULL(pbuf)) { /* * We have no room to send at the moment. Pass * responsibility for sending the ACK to the send engine diff --git a/drivers/infiniband/hw/hfi1/ud.c b/drivers/infiniband/hw/hfi1/ud.c index f88ad425664a..4cb0fce5c096 100644 --- a/drivers/infiniband/hw/hfi1/ud.c +++ b/drivers/infiniband/hw/hfi1/ud.c @@ -683,7 +683,7 @@ void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp, pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); if (ctxt) { pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL); - if (pbuf) { + if (!IS_ERR_OR_NULL(pbuf)) { trace_pio_output_ibhdr(ppd->dd, &hdr, sc5); ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, &hdr, hwords); @@ -738,7 +738,7 @@ void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn, pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); if (ctxt) { pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL); - if (pbuf) { + if (!IS_ERR_OR_NULL(pbuf)) { trace_pio_output_ibhdr(ppd->dd, &hdr, sc5); ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, &hdr, hwords); diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c index a4cbb0f3382b..bad3229bad37 100644 --- a/drivers/infiniband/hw/hfi1/verbs.c +++ b/drivers/infiniband/hw/hfi1/verbs.c @@ -1039,10 +1039,10 @@ int hfi1_verbs_send_pio(struct rvt_qp *qp, struct hfi1_pkt_state *ps, if (cb) iowait_pio_inc(&priv->s_iowait); pbuf = sc_buffer_alloc(sc, plen, cb, qp); - if (unlikely(!pbuf)) { + if (unlikely(IS_ERR_OR_NULL(pbuf))) { if (cb) verbs_pio_complete(qp, 0); - if (ppd->host_link_state != HLS_UP_ACTIVE) { + if (IS_ERR(pbuf)) { /* * If we have filled the PIO buffers to capacity and are * not in an active state this request is not going to