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authorRalph Campbell <ralph.campbell@qlogic.com>2007-07-25 11:08:28 -0700
committerRoland Dreier <rolandd@cisco.com>2007-10-09 20:05:49 -0700
commit4ee97180ac76deb5a715ac45b7d7516e6ee82ae7 (patch)
tree6683d1c34d3f36271a9d8275a645ce67222ffc56 /drivers/infiniband/hw/ipath/ipath_ud.c
parent210d6ca3db058cd1d6e6fd235ee3e25d6ac221cd (diff)
IB/ipath: Change UD to queue work requests like RC & UC
The code to post UD sends tried to process work requests at the time ib_post_send() is called without using a WQE queue. This was fine as long as HW resources were available for sending a packet. This patch changes UD to be handled more like RC and UC and shares more code. Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_ud.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_ud.c372
1 files changed, 126 insertions, 246 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_ud.c b/drivers/infiniband/hw/ipath/ipath_ud.c
index f9a3338a5fb..34c4a0a5be3 100644
--- a/drivers/infiniband/hw/ipath/ipath_ud.c
+++ b/drivers/infiniband/hw/ipath/ipath_ud.c
@@ -36,68 +36,17 @@
#include "ipath_verbs.h"
#include "ipath_kernel.h"
-static int init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe,
- u32 *lengthp, struct ipath_sge_state *ss)
-{
- int user = to_ipd(qp->ibqp.pd)->user;
- int i, j, ret;
- struct ib_wc wc;
-
- *lengthp = 0;
- for (i = j = 0; i < wqe->num_sge; i++) {
- if (wqe->sg_list[i].length == 0)
- continue;
- /* Check LKEY */
- if ((user && wqe->sg_list[i].lkey == 0) ||
- !ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge,
- &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE))
- goto bad_lkey;
- *lengthp += wqe->sg_list[i].length;
- j++;
- }
- ss->num_sge = j;
- ret = 1;
- goto bail;
-
-bad_lkey:
- wc.wr_id = wqe->wr_id;
- wc.status = IB_WC_LOC_PROT_ERR;
- wc.opcode = IB_WC_RECV;
- wc.vendor_err = 0;
- wc.byte_len = 0;
- wc.imm_data = 0;
- wc.qp = &qp->ibqp;
- wc.src_qp = 0;
- wc.wc_flags = 0;
- wc.pkey_index = 0;
- wc.slid = 0;
- wc.sl = 0;
- wc.dlid_path_bits = 0;
- wc.port_num = 0;
- /* Signal solicited completion event. */
- ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
- ret = 0;
-bail:
- return ret;
-}
-
/**
* ipath_ud_loopback - handle send on loopback QPs
- * @sqp: the QP
- * @ss: the SGE state
- * @length: the length of the data to send
- * @wr: the work request
- * @wc: the work completion entry
+ * @sqp: the sending QP
+ * @swqe: the send work request
*
- * This is called from ipath_post_ud_send() to forward a WQE addressed
+ * This is called from ipath_make_ud_req() to forward a WQE addressed
* to the same HCA.
* Note that the receive interrupt handler may be calling ipath_ud_rcv()
* while this is being called.
*/
-static void ipath_ud_loopback(struct ipath_qp *sqp,
- struct ipath_sge_state *ss,
- u32 length, struct ib_send_wr *wr,
- struct ib_wc *wc)
+static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
{
struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
struct ipath_qp *qp;
@@ -110,12 +59,18 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
struct ipath_rwq *wq;
struct ipath_rwqe *wqe;
void (*handler)(struct ib_event *, void *);
+ struct ib_wc wc;
u32 tail;
u32 rlen;
+ u32 length;
- qp = ipath_lookup_qpn(&dev->qp_table, wr->wr.ud.remote_qpn);
- if (!qp)
- return;
+ qp = ipath_lookup_qpn(&dev->qp_table, swqe->wr.wr.ud.remote_qpn);
+ if (!qp) {
+ dev->n_pkt_drops++;
+ goto send_comp;
+ }
+
+ rsge.sg_list = NULL;
/*
* Check that the qkey matches (except for QP0, see 9.6.1.4.1).
@@ -123,39 +78,34 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
* qkey from the QP context instead of the WR (see 10.2.5).
*/
if (unlikely(qp->ibqp.qp_num &&
- ((int) wr->wr.ud.remote_qkey < 0
- ? qp->qkey : wr->wr.ud.remote_qkey) != qp->qkey)) {
+ ((int) swqe->wr.wr.ud.remote_qkey < 0 ?
+ sqp->qkey : swqe->wr.wr.ud.remote_qkey) != qp->qkey)) {
/* XXX OK to lose a count once in a while. */
dev->qkey_violations++;
dev->n_pkt_drops++;
- goto done;
+ goto drop;
}
/*
* A GRH is expected to preceed the data even if not
* present on the wire.
*/
- wc->byte_len = length + sizeof(struct ib_grh);
+ length = swqe->length;
+ wc.byte_len = length + sizeof(struct ib_grh);
- if (wr->opcode == IB_WR_SEND_WITH_IMM) {
- wc->wc_flags = IB_WC_WITH_IMM;
- wc->imm_data = wr->imm_data;
+ if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
+ wc.wc_flags = IB_WC_WITH_IMM;
+ wc.imm_data = swqe->wr.imm_data;
} else {
- wc->wc_flags = 0;
- wc->imm_data = 0;
+ wc.wc_flags = 0;
+ wc.imm_data = 0;
}
- if (wr->num_sge > 1) {
- rsge.sg_list = kmalloc((wr->num_sge - 1) *
- sizeof(struct ipath_sge),
- GFP_ATOMIC);
- } else
- rsge.sg_list = NULL;
-
/*
- * Get the next work request entry to find where to put the data.
- * Note that it is safe to drop the lock after changing rq->tail
- * since ipath_post_receive() won't fill the empty slot.
+ * This would be a lot simpler if we could call ipath_get_rwqe()
+ * but that uses state that the receive interrupt handler uses
+ * so we would need to lock out receive interrupts while doing
+ * local loopback.
*/
if (qp->ibqp.srq) {
srq = to_isrq(qp->ibqp.srq);
@@ -167,32 +117,53 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
rq = &qp->r_rq;
}
+ if (rq->max_sge > 1) {
+ /*
+ * XXX We could use GFP_KERNEL if ipath_do_send()
+ * was always called from the tasklet instead of
+ * from ipath_post_send().
+ */
+ rsge.sg_list = kmalloc((rq->max_sge - 1) *
+ sizeof(struct ipath_sge),
+ GFP_ATOMIC);
+ if (!rsge.sg_list) {
+ dev->n_pkt_drops++;
+ goto drop;
+ }
+ }
+
+ /*
+ * Get the next work request entry to find where to put the data.
+ * Note that it is safe to drop the lock after changing rq->tail
+ * since ipath_post_receive() won't fill the empty slot.
+ */
spin_lock_irqsave(&rq->lock, flags);
wq = rq->wq;
tail = wq->tail;
- while (1) {
- if (unlikely(tail == wq->head)) {
- spin_unlock_irqrestore(&rq->lock, flags);
- dev->n_pkt_drops++;
- goto bail_sge;
- }
- /* Make sure entry is read after head index is read. */
- smp_rmb();
- wqe = get_rwqe_ptr(rq, tail);
- if (++tail >= rq->size)
- tail = 0;
- if (init_sge(qp, wqe, &rlen, &rsge))
- break;
- wq->tail = tail;
+ /* Validate tail before using it since it is user writable. */
+ if (tail >= rq->size)
+ tail = 0;
+ if (unlikely(tail == wq->head)) {
+ spin_unlock_irqrestore(&rq->lock, flags);
+ dev->n_pkt_drops++;
+ goto drop;
+ }
+ wqe = get_rwqe_ptr(rq, tail);
+ if (!ipath_init_sge(qp, wqe, &rlen, &rsge)) {
+ spin_unlock_irqrestore(&rq->lock, flags);
+ dev->n_pkt_drops++;
+ goto drop;
}
/* Silently drop packets which are too big. */
- if (wc->byte_len > rlen) {
+ if (wc.byte_len > rlen) {
spin_unlock_irqrestore(&rq->lock, flags);
dev->n_pkt_drops++;
- goto bail_sge;
+ goto drop;
}
+ if (++tail >= rq->size)
+ tail = 0;
wq->tail = tail;
- wc->wr_id = wqe->wr_id;
+ wc.wr_id = wqe->wr_id;
if (handler) {
u32 n;
@@ -221,13 +192,13 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
} else
spin_unlock_irqrestore(&rq->lock, flags);
- ah_attr = &to_iah(wr->wr.ud.ah)->attr;
+ ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr;
if (ah_attr->ah_flags & IB_AH_GRH) {
ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh));
- wc->wc_flags |= IB_WC_GRH;
+ wc.wc_flags |= IB_WC_GRH;
} else
ipath_skip_sge(&rsge, sizeof(struct ib_grh));
- sge = &ss->sge;
+ sge = swqe->sg_list;
while (length) {
u32 len = sge->length;
@@ -241,8 +212,8 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
sge->length -= len;
sge->sge_length -= len;
if (sge->sge_length == 0) {
- if (--ss->num_sge)
- *sge = *ss->sg_list++;
+ if (--swqe->wr.num_sge)
+ sge++;
} else if (sge->length == 0 && sge->mr != NULL) {
if (++sge->n >= IPATH_SEGSZ) {
if (++sge->m >= sge->mr->mapsz)
@@ -256,123 +227,60 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
}
length -= len;
}
- wc->status = IB_WC_SUCCESS;
- wc->opcode = IB_WC_RECV;
- wc->vendor_err = 0;
- wc->qp = &qp->ibqp;
- wc->src_qp = sqp->ibqp.qp_num;
+ wc.status = IB_WC_SUCCESS;
+ wc.opcode = IB_WC_RECV;
+ wc.vendor_err = 0;
+ wc.qp = &qp->ibqp;
+ wc.src_qp = sqp->ibqp.qp_num;
/* XXX do we know which pkey matched? Only needed for GSI. */
- wc->pkey_index = 0;
- wc->slid = dev->dd->ipath_lid |
+ wc.pkey_index = 0;
+ wc.slid = dev->dd->ipath_lid |
(ah_attr->src_path_bits &
((1 << (dev->mkeyprot_resv_lmc & 7)) - 1));
- wc->sl = ah_attr->sl;
- wc->dlid_path_bits =
+ wc.sl = ah_attr->sl;
+ wc.dlid_path_bits =
ah_attr->dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
+ wc.port_num = 1;
/* Signal completion event if the solicited bit is set. */
- ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc,
- wr->send_flags & IB_SEND_SOLICITED);
-
-bail_sge:
+ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
+ swqe->wr.send_flags & IB_SEND_SOLICITED);
+drop:
kfree(rsge.sg_list);
-done:
if (atomic_dec_and_test(&qp->refcount))
wake_up(&qp->wait);
+send_comp:
+ ipath_send_complete(sqp, swqe, IB_WC_SUCCESS);
}
/**
- * ipath_post_ud_send - post a UD send on QP
+ * ipath_make_ud_req - construct a UD request packet
* @qp: the QP
- * @wr: the work request
*
- * Note that we actually send the data as it is posted instead of putting
- * the request into a ring buffer. If we wanted to use a ring buffer,
- * we would need to save a reference to the destination address in the SWQE.
+ * Return 1 if constructed; otherwise, return 0.
*/
-int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr)
+int ipath_make_ud_req(struct ipath_qp *qp)
{
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
struct ipath_other_headers *ohdr;
struct ib_ah_attr *ah_attr;
- struct ipath_sge_state ss;
- struct ipath_sge *sg_list;
- struct ib_wc wc;
- u32 hwords;
+ struct ipath_swqe *wqe;
u32 nwords;
- u32 len;
u32 extra_bytes;
u32 bth0;
u16 lrh0;
u16 lid;
- int i;
- int ret;
+ int ret = 0;
- if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
- ret = 0;
+ if (unlikely(!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)))
goto bail;
- }
- if (wr->wr.ud.ah->pd != qp->ibqp.pd) {
- ret = -EPERM;
+ if (qp->s_cur == qp->s_head)
goto bail;
- }
- /* IB spec says that num_sge == 0 is OK. */
- if (wr->num_sge > qp->s_max_sge) {
- ret = -EINVAL;
- goto bail;
- }
-
- if (wr->num_sge > 1) {
- sg_list = kmalloc((qp->s_max_sge - 1) * sizeof(*sg_list),
- GFP_ATOMIC);
- if (!sg_list) {
- ret = -ENOMEM;
- goto bail;
- }
- } else
- sg_list = NULL;
-
- /* Check the buffer to send. */
- ss.sg_list = sg_list;
- ss.sge.mr = NULL;
- ss.sge.vaddr = NULL;
- ss.sge.length = 0;
- ss.sge.sge_length = 0;
- ss.num_sge = 0;
- len = 0;
- for (i = 0; i < wr->num_sge; i++) {
- /* Check LKEY */
- if (to_ipd(qp->ibqp.pd)->user && wr->sg_list[i].lkey == 0) {
- ret = -EINVAL;
- goto bail;
- }
-
- if (wr->sg_list[i].length == 0)
- continue;
- if (!ipath_lkey_ok(qp, ss.num_sge ?
- sg_list + ss.num_sge - 1 : &ss.sge,
- &wr->sg_list[i], 0)) {
- ret = -EINVAL;
- goto bail;
- }
- len += wr->sg_list[i].length;
- ss.num_sge++;
- }
- /* Check for invalid packet size. */
- if (len > dev->dd->ipath_ibmtu) {
- ret = -EINVAL;
- goto bail;
- }
- extra_bytes = (4 - len) & 3;
- nwords = (len + extra_bytes) >> 2;
+ wqe = get_swqe_ptr(qp, qp->s_cur);
/* Construct the header. */
- ah_attr = &to_iah(wr->wr.ud.ah)->attr;
- if (ah_attr->dlid == 0) {
- ret = -EINVAL;
- goto bail;
- }
+ ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr;
if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) {
if (ah_attr->dlid != IPATH_PERMISSIVE_LID)
dev->n_multicast_xmit++;
@@ -383,64 +291,53 @@ int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr)
lid = ah_attr->dlid &
~((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
if (unlikely(lid == dev->dd->ipath_lid)) {
- /*
- * Pass in an uninitialized ib_wc to save stack
- * space.
- */
- ipath_ud_loopback(qp, &ss, len, wr, &wc);
+ ipath_ud_loopback(qp, wqe);
goto done;
}
}
+
+ extra_bytes = -wqe->length & 3;
+ nwords = (wqe->length + extra_bytes) >> 2;
+
+ /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */
+ qp->s_hdrwords = 7;
+ if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
+ qp->s_hdrwords++;
+ qp->s_cur_size = wqe->length;
+ qp->s_cur_sge = &qp->s_sge;
+ qp->s_wqe = wqe;
+ qp->s_sge.sge = wqe->sg_list[0];
+ qp->s_sge.sg_list = wqe->sg_list + 1;
+ qp->s_sge.num_sge = wqe->wr.num_sge;
+
if (ah_attr->ah_flags & IB_AH_GRH) {
/* Header size in 32-bit words. */
- hwords = 17;
+ qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
+ &ah_attr->grh,
+ qp->s_hdrwords, nwords);
lrh0 = IPATH_LRH_GRH;
ohdr = &qp->s_hdr.u.l.oth;
- qp->s_hdr.u.l.grh.version_tclass_flow =
- cpu_to_be32((6 << 28) |
- (ah_attr->grh.traffic_class << 20) |
- ah_attr->grh.flow_label);
- qp->s_hdr.u.l.grh.paylen =
- cpu_to_be16(((wr->opcode ==
- IB_WR_SEND_WITH_IMM ? 6 : 5) +
- nwords + SIZE_OF_CRC) << 2);
- /* next_hdr is defined by C8-7 in ch. 8.4.1 */
- qp->s_hdr.u.l.grh.next_hdr = 0x1B;
- qp->s_hdr.u.l.grh.hop_limit = ah_attr->grh.hop_limit;
- /* The SGID is 32-bit aligned. */
- qp->s_hdr.u.l.grh.sgid.global.subnet_prefix =
- dev->gid_prefix;
- qp->s_hdr.u.l.grh.sgid.global.interface_id =
- dev->dd->ipath_guid;
- qp->s_hdr.u.l.grh.dgid = ah_attr->grh.dgid;
/*
* Don't worry about sending to locally attached multicast
* QPs. It is unspecified by the spec. what happens.
*/
} else {
/* Header size in 32-bit words. */
- hwords = 7;
lrh0 = IPATH_LRH_BTH;
ohdr = &qp->s_hdr.u.oth;
}
- if (wr->opcode == IB_WR_SEND_WITH_IMM) {
- ohdr->u.ud.imm_data = wr->imm_data;
- wc.imm_data = wr->imm_data;
- hwords += 1;
+ if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
+ ohdr->u.ud.imm_data = wqe->wr.imm_data;
bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
- } else if (wr->opcode == IB_WR_SEND) {
- wc.imm_data = 0;
+ } else
bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
- } else {
- ret = -EINVAL;
- goto bail;
- }
lrh0 |= ah_attr->sl << 4;
if (qp->ibqp.qp_type == IB_QPT_SMI)
lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */
- qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC);
+ qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
+ SIZE_OF_CRC);
lid = dev->dd->ipath_lid;
if (lid) {
lid |= ah_attr->src_path_bits &
@@ -448,7 +345,7 @@ int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr)
qp->s_hdr.lrh[3] = cpu_to_be16(lid);
} else
qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE;
- if (wr->send_flags & IB_SEND_SOLICITED)
+ if (wqe->wr.send_flags & IB_SEND_SOLICITED)
bth0 |= 1 << 23;
bth0 |= extra_bytes << 20;
bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY :
@@ -460,38 +357,20 @@ int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr)
ohdr->bth[1] = ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
ah_attr->dlid != IPATH_PERMISSIVE_LID ?
__constant_cpu_to_be32(IPATH_MULTICAST_QPN) :
- cpu_to_be32(wr->wr.ud.remote_qpn);
- /* XXX Could lose a PSN count but not worth locking */
+ cpu_to_be32(wqe->wr.wr.ud.remote_qpn);
ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_PSN_MASK);
/*
* Qkeys with the high order bit set mean use the
* qkey from the QP context instead of the WR (see 10.2.5).
*/
- ohdr->u.ud.deth[0] = cpu_to_be32((int)wr->wr.ud.remote_qkey < 0 ?
- qp->qkey : wr->wr.ud.remote_qkey);
+ ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ?
+ qp->qkey : wqe->wr.wr.ud.remote_qkey);
ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
- if (ipath_verbs_send(dev->dd, hwords, (u32 *) &qp->s_hdr,
- len, &ss))
- dev->n_no_piobuf++;
done:
- /* Queue the completion status entry. */
- if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
- (wr->send_flags & IB_SEND_SIGNALED)) {
- wc.wr_id = wr->wr_id;
- wc.status = IB_WC_SUCCESS;
- wc.vendor_err = 0;
- wc.opcode = IB_WC_SEND;
- wc.byte_len = len;
- wc.qp = &qp->ibqp;
- wc.src_qp = 0;
- wc.wc_flags = 0;
- /* XXX initialize other fields? */
- ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
- }
- kfree(sg_list);
-
- ret = 0;
+ if (++qp->s_cur >= qp->s_size)
+ qp->s_cur = 0;
+ ret = 1;
bail:
return ret;
@@ -673,6 +552,7 @@ void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
*/
wc.dlid_path_bits = dlid >= IPATH_MULTICAST_LID_BASE ? 0 :
dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
+ wc.port_num = 1;
/* Signal completion event if the solicited bit is set. */
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
(ohdr->bth[0] &