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path: root/drivers/infiniband/hw/ipath/ipath_uc.c
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Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_uc.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_uc.c153
1 files changed, 29 insertions, 124 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_uc.c b/drivers/infiniband/hw/ipath/ipath_uc.c
index b64d9dd..89b3e1a 100644
--- a/drivers/infiniband/hw/ipath/ipath_uc.c
+++ b/drivers/infiniband/hw/ipath/ipath_uc.c
@@ -62,90 +62,40 @@ static void complete_last_send(struct ipath_qp *qp, struct ipath_swqe *wqe,
}
/**
- * ipath_do_uc_send - do a send on a UC queue
- * @data: contains a pointer to the QP to send on
+ * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
+ * @qp: a pointer to the QP
+ * @ohdr: a pointer to the IB header being constructed
+ * @pmtu: the path MTU
+ * @bth0p: pointer to the BTH opcode word
+ * @bth2p: pointer to the BTH PSN word
*
- * Process entries in the send work queue until the queue is exhausted.
- * Only allow one CPU to send a packet per QP (tasklet).
- * Otherwise, after we drop the QP lock, two threads could send
- * packets out of order.
- * This is similar to ipath_do_rc_send() below except we don't have
- * timeouts or resends.
+ * Return 1 if constructed; otherwise, return 0.
+ * Note the QP s_lock must be held and interrupts disabled.
*/
-void ipath_do_uc_send(unsigned long data)
+int ipath_make_uc_req(struct ipath_qp *qp,
+ struct ipath_other_headers *ohdr,
+ u32 pmtu, u32 *bth0p, u32 *bth2p)
{
- struct ipath_qp *qp = (struct ipath_qp *)data;
- struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
struct ipath_swqe *wqe;
- unsigned long flags;
- u16 lrh0;
u32 hwords;
- u32 nwords;
- u32 extra_bytes;
u32 bth0;
- u32 bth2;
- u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
u32 len;
- struct ipath_other_headers *ohdr;
struct ib_wc wc;
- if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
- goto bail;
-
- if (unlikely(qp->remote_ah_attr.dlid ==
- ipath_layer_get_lid(dev->dd))) {
- /* Pass in an uninitialized ib_wc to save stack space. */
- ipath_ruc_loopback(qp, &wc);
- clear_bit(IPATH_S_BUSY, &qp->s_flags);
- goto bail;
- }
-
- ohdr = &qp->s_hdr.u.oth;
- if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
- ohdr = &qp->s_hdr.u.l.oth;
-
-again:
- /* Check for a constructed packet to be sent. */
- if (qp->s_hdrwords != 0) {
- /*
- * If no PIO bufs are available, return.
- * An interrupt will call ipath_ib_piobufavail()
- * when one is available.
- */
- if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
- (u32 *) &qp->s_hdr,
- qp->s_cur_size,
- qp->s_cur_sge)) {
- ipath_no_bufs_available(qp, dev);
- goto bail;
- }
- dev->n_unicast_xmit++;
- /* Record that we sent the packet and s_hdr is empty. */
- qp->s_hdrwords = 0;
- }
-
- lrh0 = IPS_LRH_BTH;
- /* header size in 32-bit words LRH+BTH = (8+12)/4. */
- hwords = 5;
-
- /*
- * The lock is needed to synchronize between
- * setting qp->s_ack_state and post_send().
- */
- spin_lock_irqsave(&qp->s_lock, flags);
-
if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK))
goto done;
- bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
+ /* header size in 32-bit words LRH+BTH = (8+12)/4. */
+ hwords = 5;
+ bth0 = 0;
- /* Send a request. */
+ /* Get the next send request. */
wqe = get_swqe_ptr(qp, qp->s_last);
switch (qp->s_state) {
default:
/*
- * Signal the completion of the last send (if there is
- * one).
+ * Signal the completion of the last send
+ * (if there is one).
*/
if (qp->s_last != qp->s_tail)
complete_last_send(qp, wqe, &wc);
@@ -258,61 +208,16 @@ again:
}
break;
}
- bth2 = qp->s_next_psn++ & IPS_PSN_MASK;
qp->s_len -= len;
- bth0 |= qp->s_state << 24;
-
- spin_unlock_irqrestore(&qp->s_lock, flags);
-
- /* Construct the header. */
- extra_bytes = (4 - len) & 3;
- nwords = (len + extra_bytes) >> 2;
- if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
- /* Header size in 32-bit words. */
- hwords += 10;
- lrh0 = IPS_LRH_GRH;
- qp->s_hdr.u.l.grh.version_tclass_flow =
- cpu_to_be32((6 << 28) |
- (qp->remote_ah_attr.grh.traffic_class
- << 20) |
- qp->remote_ah_attr.grh.flow_label);
- qp->s_hdr.u.l.grh.paylen =
- cpu_to_be16(((hwords - 12) + 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 =
- qp->remote_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 =
- ipath_layer_get_guid(dev->dd);
- qp->s_hdr.u.l.grh.dgid = qp->remote_ah_attr.grh.dgid;
- }
qp->s_hdrwords = hwords;
qp->s_cur_sge = &qp->s_sge;
qp->s_cur_size = len;
- lrh0 |= qp->remote_ah_attr.sl << 4;
- qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
- /* DEST LID */
- qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
- qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC);
- qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
- bth0 |= extra_bytes << 20;
- ohdr->bth[0] = cpu_to_be32(bth0);
- ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
- ohdr->bth[2] = cpu_to_be32(bth2);
-
- /* Check for more work to do. */
- goto again;
+ *bth0p = bth0 | (qp->s_state << 24);
+ *bth2p = qp->s_next_psn++ & IPS_PSN_MASK;
+ return 1;
done:
- spin_unlock_irqrestore(&qp->s_lock, flags);
- clear_bit(IPATH_S_BUSY, &qp->s_flags);
-
-bail:
- return;
+ return 0;
}
/**
@@ -536,12 +441,13 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
if (qp->r_len != 0) {
u32 rkey = be32_to_cpu(reth->rkey);
u64 vaddr = be64_to_cpu(reth->vaddr);
+ int ok;
/* Check rkey */
- if (unlikely(!ipath_rkey_ok(
- dev, &qp->r_sge, qp->r_len,
- vaddr, rkey,
- IB_ACCESS_REMOTE_WRITE))) {
+ ok = ipath_rkey_ok(dev, &qp->r_sge, qp->r_len,
+ vaddr, rkey,
+ IB_ACCESS_REMOTE_WRITE);
+ if (unlikely(!ok)) {
dev->n_pkt_drops++;
goto done;
}
@@ -559,8 +465,7 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
}
if (opcode == OP(RDMA_WRITE_ONLY))
goto rdma_last;
- else if (opcode ==
- OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
+ else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
goto rdma_last_imm;
/* FALLTHROUGH */
case OP(RDMA_WRITE_MIDDLE):
@@ -593,9 +498,9 @@ void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
dev->n_pkt_drops++;
goto done;
}
- if (qp->r_reuse_sge) {
+ if (qp->r_reuse_sge)
qp->r_reuse_sge = 0;
- } else if (!ipath_get_rwqe(qp, 1)) {
+ else if (!ipath_get_rwqe(qp, 1)) {
dev->n_pkt_drops++;
goto done;
}
generated by cgit v0.10.2 at 2024-11-11 18:06:48 (GMT)