IB/ipath: add calls to new 7220 code and enable in build

This patch adds the initialization calls into the new 7220 HCA files,
changes the Makefile to compile and link the new files, and code to
handle send DMA.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 378 insertions, 13 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index 2e6b6f6265b6..75429aa92ce5 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -242,6 +242,93 @@ static void ipath_flush_wqe(struct ipath_qp *qp, struct ib_send_wr *wr)
         ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 1);
 }
 
+/*
+ * Count the number of DMA descriptors needed to send length bytes of data.
+ * Don't modify the ipath_sge_state to get the count.
+ * Return zero if any of the segments is not aligned.
+ */
+static u32 ipath_count_sge(struct ipath_sge_state *ss, u32 length)
+{
+        struct ipath_sge *sg_list = ss->sg_list;
+        struct ipath_sge sge = ss->sge;
+        u8 num_sge = ss->num_sge;
+        u32 ndesc = 1;  /* count the header */
+
+        while (length) {
+                u32 len = sge.length;
+
+                if (len > length)
+                        len = length;
+                if (len > sge.sge_length)
+                        len = sge.sge_length;
+                BUG_ON(len == 0);
+                if (((long) sge.vaddr & (sizeof(u32) - 1)) ||
+                    (len != length && (len & (sizeof(u32) - 1)))) {
+                        ndesc = 0;
+                        break;
+                }
+                ndesc++;
+                sge.vaddr += len;
+                sge.length -= len;
+                sge.sge_length -= len;
+                if (sge.sge_length == 0) {
+                        if (--num_sge)
+                                sge = *sg_list++;
+                } else if (sge.length == 0 && sge.mr != NULL) {
+                        if (++sge.n >= IPATH_SEGSZ) {
+                                if (++sge.m >= sge.mr->mapsz)
+                                        break;
+                                sge.n = 0;
+                        }
+                        sge.vaddr =
+                                sge.mr->map[sge.m]->segs[sge.n].vaddr;
+                        sge.length =
+                                sge.mr->map[sge.m]->segs[sge.n].length;
+                }
+                length -= len;
+        }
+        return ndesc;
+}
+
+/*
+ * Copy from the SGEs to the data buffer.
+ */
+static void ipath_copy_from_sge(void *data, struct ipath_sge_state *ss,
+                                u32 length)
+{
+        struct ipath_sge *sge = &ss->sge;
+
+        while (length) {
+                u32 len = sge->length;
+
+                if (len > length)
+                        len = length;
+                if (len > sge->sge_length)
+                        len = sge->sge_length;
+                BUG_ON(len == 0);
+                memcpy(data, sge->vaddr, len);
+                sge->vaddr += len;
+                sge->length -= len;
+                sge->sge_length -= len;
+                if (sge->sge_length == 0) {
+                        if (--ss->num_sge)
+                                *sge = *ss->sg_list++;
+                } else if (sge->length == 0 && sge->mr != NULL) {
+                        if (++sge->n >= IPATH_SEGSZ) {
+                                if (++sge->m >= sge->mr->mapsz)
+                                        break;
+                                sge->n = 0;
+                        }
+                        sge->vaddr =
+                                sge->mr->map[sge->m]->segs[sge->n].vaddr;
+                        sge->length =
+                                sge->mr->map[sge->m]->segs[sge->n].length;
+                }
+                data += len;
+                length -= len;
+        }
+}
+
 /**
  * ipath_post_one_send - post one RC, UC, or UD send work request
  * @qp: the QP to post on
@@ -866,13 +953,231 @@ static void copy_io(u32 __iomem *piobuf, struct ipath_sge_state *ss,
                 __raw_writel(last, piobuf);
 }
 
-static int ipath_verbs_send_pio(struct ipath_qp *qp, u32 *hdr, u32 hdrwords,
+/*
+ * Convert IB rate to delay multiplier.
+ */
+unsigned ipath_ib_rate_to_mult(enum ib_rate rate)
+{
+        switch (rate) {
+        case IB_RATE_2_5_GBPS: return 8;
+        case IB_RATE_5_GBPS:   return 4;
+        case IB_RATE_10_GBPS:  return 2;
+        case IB_RATE_20_GBPS:  return 1;
+        default:               return 0;
+        }
+}
+
+/*
+ * Convert delay multiplier to IB rate
+ */
+static enum ib_rate ipath_mult_to_ib_rate(unsigned mult)
+{
+        switch (mult) {
+        case 8:  return IB_RATE_2_5_GBPS;
+        case 4:  return IB_RATE_5_GBPS;
+        case 2:  return IB_RATE_10_GBPS;
+        case 1:  return IB_RATE_20_GBPS;
+        default: return IB_RATE_PORT_CURRENT;
+        }
+}
+
+static inline struct ipath_verbs_txreq *get_txreq(struct ipath_ibdev *dev)
+{
+        struct ipath_verbs_txreq *tx = NULL;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dev->pending_lock, flags);
+        if (!list_empty(&dev->txreq_free)) {
+                struct list_head *l = dev->txreq_free.next;
+
+                list_del(l);
+                tx = list_entry(l, struct ipath_verbs_txreq, txreq.list);
+        }
+        spin_unlock_irqrestore(&dev->pending_lock, flags);
+        return tx;
+}
+
+static inline void put_txreq(struct ipath_ibdev *dev,
+                             struct ipath_verbs_txreq *tx)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&dev->pending_lock, flags);
+        list_add(&tx->txreq.list, &dev->txreq_free);
+        spin_unlock_irqrestore(&dev->pending_lock, flags);
+}
+
+static void sdma_complete(void *cookie, int status)
+{
+        struct ipath_verbs_txreq *tx = cookie;
+        struct ipath_qp *qp = tx->qp;
+        struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
+
+        /* Generate a completion queue entry if needed */
+        if (qp->ibqp.qp_type != IB_QPT_RC && tx->wqe) {
+                enum ib_wc_status ibs = status == IPATH_SDMA_TXREQ_S_OK ?
+                        IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR;
+
+                ipath_send_complete(qp, tx->wqe, ibs);
+        }
+
+        if (tx->txreq.flags & IPATH_SDMA_TXREQ_F_FREEBUF)
+                kfree(tx->txreq.map_addr);
+        put_txreq(dev, tx);
+
+        if (atomic_dec_and_test(&qp->refcount))
+                wake_up(&qp->wait);
+}
+
+/*
+ * Compute the number of clock cycles of delay before sending the next packet.
+ * The multipliers reflect the number of clocks for the fastest rate so
+ * one tick at 4xDDR is 8 ticks at 1xSDR.
+ * If the destination port will take longer to receive a packet than
+ * the outgoing link can send it, we need to delay sending the next packet
+ * by the difference in time it takes the receiver to receive and the sender
+ * to send this packet.
+ * Note that this delay is always correct for UC and RC but not always
+ * optimal for UD. For UD, the destination HCA can be different for each
+ * packet, in which case, we could send packets to a different destination
+ * while "waiting" for the delay. The overhead for doing this without
+ * HW support is more than just paying the cost of delaying some packets
+ * unnecessarily.
+ */
+static inline unsigned ipath_pkt_delay(u32 plen, u8 snd_mult, u8 rcv_mult)
+{
+        return (rcv_mult > snd_mult) ?
+                (plen * (rcv_mult - snd_mult) + 1) >> 1 : 0;
+}
+
+static int ipath_verbs_send_dma(struct ipath_qp *qp,
+                                struct ipath_ib_header *hdr, u32 hdrwords,
+                                struct ipath_sge_state *ss, u32 len,
+                                u32 plen, u32 dwords)
+{
+        struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
+        struct ipath_devdata *dd = dev->dd;
+        struct ipath_verbs_txreq *tx;
+        u32 *piobuf;
+        u32 control;
+        u32 ndesc;
+        int ret;
+
+        tx = qp->s_tx;
+        if (tx) {
+                qp->s_tx = NULL;
+                /* resend previously constructed packet */
+                ret = ipath_sdma_verbs_send(dd, tx->ss, tx->len, tx);
+                if (ret)
+                        qp->s_tx = tx;
+                goto bail;
+        }
+
+        tx = get_txreq(dev);
+        if (!tx) {
+                ret = -EBUSY;
+                goto bail;
+        }
+
+        /*
+         * Get the saved delay count we computed for the previous packet
+         * and save the delay count for this packet to be used next time
+         * we get here.
+         */
+        control = qp->s_pkt_delay;
+        qp->s_pkt_delay = ipath_pkt_delay(plen, dd->delay_mult, qp->s_dmult);
+
+        tx->qp = qp;
+        atomic_inc(&qp->refcount);
+        tx->wqe = qp->s_wqe;
+        tx->txreq.callback = sdma_complete;
+        tx->txreq.callback_cookie = tx;
+        tx->txreq.flags = IPATH_SDMA_TXREQ_F_HEADTOHOST |
+                IPATH_SDMA_TXREQ_F_INTREQ | IPATH_SDMA_TXREQ_F_FREEDESC;
+        if (plen + 1 >= IPATH_SMALLBUF_DWORDS)
+                tx->txreq.flags |= IPATH_SDMA_TXREQ_F_USELARGEBUF;
+
+        /* VL15 packets bypass credit check */
+        if ((be16_to_cpu(hdr->lrh[0]) >> 12) == 15) {
+                control |= 1ULL << 31;
+                tx->txreq.flags |= IPATH_SDMA_TXREQ_F_VL15;
+        }
+
+        if (len) {
+                /*
+                 * Don't try to DMA if it takes more descriptors than
+                 * the queue holds.
+                 */
+                ndesc = ipath_count_sge(ss, len);
+                if (ndesc >= dd->ipath_sdma_descq_cnt)
+                        ndesc = 0;
+        } else
+                ndesc = 1;
+        if (ndesc) {
+                tx->hdr.pbc[0] = cpu_to_le32(plen);
+                tx->hdr.pbc[1] = cpu_to_le32(control);
+                memcpy(&tx->hdr.hdr, hdr, hdrwords << 2);
+                tx->txreq.sg_count = ndesc;
+                tx->map_len = (hdrwords + 2) << 2;
+                tx->txreq.map_addr = &tx->hdr;
+                ret = ipath_sdma_verbs_send(dd, ss, dwords, tx);
+                if (ret) {
+                        /* save ss and length in dwords */
+                        tx->ss = ss;
+                        tx->len = dwords;
+                        qp->s_tx = tx;
+                }
+                goto bail;
+        }
+
+        /* Allocate a buffer and copy the header and payload to it. */
+        tx->map_len = (plen + 1) << 2;
+        piobuf = kmalloc(tx->map_len, GFP_ATOMIC);
+        if (unlikely(piobuf == NULL)) {
+                ret = -EBUSY;
+                goto err_tx;
+        }
+        tx->txreq.map_addr = piobuf;
+        tx->txreq.flags |= IPATH_SDMA_TXREQ_F_FREEBUF;
+        tx->txreq.sg_count = 1;
+
+        *piobuf++ = (__force u32) cpu_to_le32(plen);
+        *piobuf++ = (__force u32) cpu_to_le32(control);
+        memcpy(piobuf, hdr, hdrwords << 2);
+        ipath_copy_from_sge(piobuf + hdrwords, ss, len);
+
+        ret = ipath_sdma_verbs_send(dd, NULL, 0, tx);
+        /*
+         * If we couldn't queue the DMA request, save the info
+         * and try again later rather than destroying the
+         * buffer and undoing the side effects of the copy.
+         */
+        if (ret) {
+                tx->ss = NULL;
+                tx->len = 0;
+                qp->s_tx = tx;
+        }
+        dev->n_unaligned++;
+        goto bail;
+
+err_tx:
+        if (atomic_dec_and_test(&qp->refcount))
+                wake_up(&qp->wait);
+        put_txreq(dev, tx);
+bail:
+        return ret;
+}
+
+static int ipath_verbs_send_pio(struct ipath_qp *qp,
+                                struct ipath_ib_header *ibhdr, u32 hdrwords,
                                 struct ipath_sge_state *ss, u32 len,
                                 u32 plen, u32 dwords)
 {
         struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
+        u32 *hdr = (u32 *) ibhdr;
         u32 __iomem *piobuf;
         unsigned flush_wc;
+        u32 control;
         int ret;
 
         piobuf = ipath_getpiobuf(dd, plen, NULL);
@@ -882,11 +1187,23 @@ static int ipath_verbs_send_pio(struct ipath_qp *qp, u32 *hdr, u32 hdrwords,
         }
 
         /*
-         * Write len to control qword, no flags.
+         * Get the saved delay count we computed for the previous packet
+         * and save the delay count for this packet to be used next time
+         * we get here.
+         */
+        control = qp->s_pkt_delay;
+        qp->s_pkt_delay = ipath_pkt_delay(plen, dd->delay_mult, qp->s_dmult);
+
+        /* VL15 packets bypass credit check */
+        if ((be16_to_cpu(ibhdr->lrh[0]) >> 12) == 15)
+                control |= 1ULL << 31;
+
+        /*
+         * Write the length to the control qword plus any needed flags.
          * We have to flush after the PBC for correctness on some cpus
          * or WC buffer can be written out of order.
          */
-        writeq(plen, piobuf);
+        writeq(((u64) control << 32) | plen, piobuf);
         piobuf += 2;
 
         flush_wc = dd->ipath_flags & IPATH_PIO_FLUSH_WC;
@@ -961,15 +1278,25 @@ int ipath_verbs_send(struct ipath_qp *qp, struct ipath_ib_header *hdr,
          */
         plen = hdrwords + dwords + 1;
 
-        /* Drop non-VL15 packets if we are not in the active state */
-        if (!(dd->ipath_flags & IPATH_LINKACTIVE) &&
-            qp->ibqp.qp_type != IB_QPT_SMI) {
+        /*
+         * VL15 packets (IB_QPT_SMI) will always use PIO, so we
+         * can defer SDMA restart until link goes ACTIVE without
+         * worrying about just how we got there.
+         */
+        if (qp->ibqp.qp_type == IB_QPT_SMI)
+                ret = ipath_verbs_send_pio(qp, hdr, hdrwords, ss, len,
+                                           plen, dwords);
+        /* All non-VL15 packets are dropped if link is not ACTIVE */
+        else if (!(dd->ipath_flags & IPATH_LINKACTIVE)) {
                 if (qp->s_wqe)
                         ipath_send_complete(qp, qp->s_wqe, IB_WC_SUCCESS);
                 ret = 0;
-        } else
-                ret = ipath_verbs_send_pio(qp, (u32 *) hdr, hdrwords,
-                                           ss, len, plen, dwords);
+        } else if (dd->ipath_flags & IPATH_HAS_SEND_DMA)
+                ret = ipath_verbs_send_dma(qp, hdr, hdrwords, ss, len,
+                                           plen, dwords);
+        else
+                ret = ipath_verbs_send_pio(qp, hdr, hdrwords, ss, len,
+                                           plen, dwords);
 
         return ret;
 }
@@ -1038,6 +1365,12 @@ int ipath_get_counters(struct ipath_devdata *dd,
                 ipath_snap_cntr(dd, crp->cr_errlpcrccnt) +
                 ipath_snap_cntr(dd, crp->cr_badformatcnt) +
                 dd->ipath_rxfc_unsupvl_errs;
+        if (crp->cr_rxotherlocalphyerrcnt)
+                cntrs->port_rcv_errors +=
+                        ipath_snap_cntr(dd, crp->cr_rxotherlocalphyerrcnt);
+        if (crp->cr_rxvlerrcnt)
+                cntrs->port_rcv_errors +=
+                        ipath_snap_cntr(dd, crp->cr_rxvlerrcnt);
         cntrs->port_rcv_remphys_errors =
                 ipath_snap_cntr(dd, crp->cr_rcvebpcnt);
         cntrs->port_xmit_discards = ipath_snap_cntr(dd, crp->cr_unsupvlcnt);
@@ -1046,9 +1379,16 @@ int ipath_get_counters(struct ipath_devdata *dd,
         cntrs->port_xmit_packets = ipath_snap_cntr(dd, crp->cr_pktsendcnt);
         cntrs->port_rcv_packets = ipath_snap_cntr(dd, crp->cr_pktrcvcnt);
         cntrs->local_link_integrity_errors =
-                (dd->ipath_flags & IPATH_GPIO_ERRINTRS) ?
-                dd->ipath_lli_errs : dd->ipath_lli_errors;
-        cntrs->excessive_buffer_overrun_errors = dd->ipath_overrun_thresh_errs;
+                crp->cr_locallinkintegrityerrcnt ?
+                ipath_snap_cntr(dd, crp->cr_locallinkintegrityerrcnt) :
+                ((dd->ipath_flags & IPATH_GPIO_ERRINTRS) ?
+                 dd->ipath_lli_errs : dd->ipath_lli_errors);
+        cntrs->excessive_buffer_overrun_errors =
+                crp->cr_excessbufferovflcnt ?
+                ipath_snap_cntr(dd, crp->cr_excessbufferovflcnt) :
+                dd->ipath_overrun_thresh_errs;
+        cntrs->vl15_dropped = crp->cr_vl15droppedpktcnt ?
+                ipath_snap_cntr(dd, crp->cr_vl15droppedpktcnt) : 0;
 
         ret = 0;
 
@@ -1396,6 +1736,7 @@ static struct ib_ah *ipath_create_ah(struct ib_pd *pd,
 
         /* ib_create_ah() will initialize ah->ibah. */
         ah->attr = *ah_attr;
+        ah->attr.static_rate = ipath_ib_rate_to_mult(ah_attr->static_rate);
 
         ret = &ah->ibah;
 
@@ -1429,6 +1770,7 @@ static int ipath_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
         struct ipath_ah *ah = to_iah(ibah);
 
         *ah_attr = ah->attr;
+        ah_attr->static_rate = ipath_mult_to_ib_rate(ah->attr.static_rate);
 
         return 0;
 }
@@ -1578,6 +1920,8 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
         struct ipath_verbs_counters cntrs;
         struct ipath_ibdev *idev;
         struct ib_device *dev;
+        struct ipath_verbs_txreq *tx;
+        unsigned i;
         int ret;
 
         idev = (struct ipath_ibdev *)ib_alloc_device(sizeof *idev);
@@ -1588,6 +1932,17 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
 
         dev = &idev->ibdev;
 
+        if (dd->ipath_sdma_descq_cnt) {
+                tx = kmalloc(dd->ipath_sdma_descq_cnt * sizeof *tx,
+                             GFP_KERNEL);
+                if (tx == NULL) {
+                        ret = -ENOMEM;
+                        goto err_tx;
+                }
+        } else
+                tx = NULL;
+        idev->txreq_bufs = tx;
+
         /* Only need to initialize non-zero fields. */
         spin_lock_init(&idev->n_pds_lock);
         spin_lock_init(&idev->n_ahs_lock);
@@ -1628,6 +1983,7 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
         INIT_LIST_HEAD(&idev->pending[2]);
         INIT_LIST_HEAD(&idev->piowait);
         INIT_LIST_HEAD(&idev->rnrwait);
+        INIT_LIST_HEAD(&idev->txreq_free);
         idev->pending_index = 0;
         idev->port_cap_flags =
                 IB_PORT_SYS_IMAGE_GUID_SUP | IB_PORT_CLIENT_REG_SUP;
@@ -1659,6 +2015,9 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
                 cntrs.excessive_buffer_overrun_errors;
         idev->z_vl15_dropped = cntrs.vl15_dropped;
 
+        for (i = 0; i < dd->ipath_sdma_descq_cnt; i++, tx++)
+                list_add(&tx->txreq.list, &idev->txreq_free);
+
         /*
          * The system image GUID is supposed to be the same for all
          * IB HCAs in a single system but since there can be other
@@ -1708,6 +2067,7 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
         dev->phys_port_cnt = 1;
         dev->num_comp_vectors = 1;
         dev->dma_device = &dd->pcidev->dev;
+        dev->class_dev.dev = dev->dma_device;
         dev->query_device = ipath_query_device;
         dev->modify_device = ipath_modify_device;
         dev->query_port = ipath_query_port;
@@ -1772,6 +2132,8 @@ err_reg:
 err_lk:
         kfree(idev->qp_table.table);
 err_qp:
+        kfree(idev->txreq_bufs);
+err_tx:
         ib_dealloc_device(dev);
         ipath_dev_err(dd, "cannot register verbs: %d!\n", -ret);
         idev = NULL;
@@ -1806,6 +2168,7 @@ void ipath_unregister_ib_device(struct ipath_ibdev *dev)
         ipath_free_all_qps(&dev->qp_table);
         kfree(dev->qp_table.table);
         kfree(dev->lk_table.table);
+        kfree(dev->txreq_bufs);
         ib_dealloc_device(ibdev);
 }
 
@@ -1853,13 +2216,15 @@ static ssize_t show_stats(struct class_device *cdev, char *buf)
                       "RC stalls   %d\n"
                       "piobuf wait %d\n"
                       "no piobuf   %d\n"
+                      "unaligned   %d\n"
                       "PKT drops   %d\n"
                       "WQE errs    %d\n",
                       dev->n_rc_resends, dev->n_rc_qacks, dev->n_rc_acks,
                       dev->n_seq_naks, dev->n_rdma_seq, dev->n_rnr_naks,
                       dev->n_other_naks, dev->n_timeouts,
                       dev->n_rdma_dup_busy, dev->n_rc_stalls, dev->n_piowait,
-                      dev->n_no_piobuf, dev->n_pkt_drops, dev->n_wqe_errs);
+                      dev->n_no_piobuf, dev->n_unaligned,
+                      dev->n_pkt_drops, dev->n_wqe_errs);
         for (i = 0; i < ARRAY_SIZE(dev->opstats); i++) {
                 const struct ipath_opcode_stats *si = &dev->opstats[i];