[patch v2 24/37] add rxe_recv.c

[rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org]

[-- Attachment #1: add-rxe_recv.c --]
[-- Type: text/plain, Size: 11017 bytes --]

handles receiving new packets which are
sent to either request or response processing.

Signed-off-by: Bob Pearson <rpearson-klaOcWyJdxkshyMvu7JE4pqQE7yCjDx5@public.gmane.org>

---
 drivers/infiniband/hw/rxe/rxe_recv.c |  425 +++++++++++++++++++++++++++++++++++
 1 file changed, 425 insertions(+)

Index: infiniband/drivers/infiniband/hw/rxe/rxe_recv.c
===================================================================
--- /dev/null
+++ infiniband/drivers/infiniband/hw/rxe/rxe_recv.c
@@ -0,0 +1,425 @@
+/*
+ * Copyright (c) 2009-2011 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2009-2011 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *	- Redistributions of source code must retain the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer.
+ *
+ *	- Redistributions in binary form must reproduce the above
+ *	  copyright notice, this list of conditions and the following
+ *	  disclaimer in the documentation and/or other materials
+ *	  provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/skbuff.h>
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+			    struct rxe_qp *qp)
+{
+	if (unlikely(!qp->valid))
+		goto err1;
+
+	switch (qp_type(qp)) {
+	case IB_QPT_RC:
+		if (unlikely((pkt->opcode >> 5) != 0)) {
+			pr_warn("bad qp type\n");
+			goto err1;
+		}
+		break;
+	case IB_QPT_UC:
+		if (unlikely((pkt->opcode >> 5) != 1)) {
+			pr_warn("bad qp type\n");
+			goto err1;
+		}
+		break;
+	case IB_QPT_UD:
+	case IB_QPT_SMI:
+	case IB_QPT_GSI:
+		if (unlikely((pkt->opcode >> 5) != 3)) {
+			pr_warn("bad qp type\n");
+			goto err1;
+		}
+		break;
+	default:
+		pr_warn("unsupported qp type\n");
+		goto err1;
+	}
+
+	if (pkt->mask & RXE_REQ_MASK) {
+		if (unlikely(qp->resp.state != QP_STATE_READY))
+			goto err1;
+	} else if (unlikely(qp->req.state < QP_STATE_READY ||
+			qp->req.state > QP_STATE_DRAINED))
+			goto err1;
+
+	return 0;
+
+err1:
+	return -EINVAL;
+}
+
+static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+		      u32 qpn, struct rxe_qp *qp)
+{
+	int i;
+	int found_pkey = 0;
+	struct rxe_port *port = &rxe->port[pkt->port_num - 1];
+	u16 pkey = bth_pkey(pkt);
+
+	pkt->pkey_index = 0;
+
+	if (qpn == 1) {
+		for (i = 0; i < port->attr.pkey_tbl_len; i++) {
+			if (pkey_match(pkey, port->pkey_tbl[i])) {
+				pkt->pkey_index = i;
+				found_pkey = 1;
+				break;
+			}
+		}
+
+		if (!found_pkey) {
+			pr_warn("bad pkey = 0x%x\n", pkey);
+			spin_lock_bh(&port->port_lock);
+			port->attr.bad_pkey_cntr
+				= (port->attr.bad_pkey_cntr >= 0xffff) ?
+				   0xffff :
+				   port->attr.bad_pkey_cntr + 1;
+			spin_unlock_bh(&port->port_lock);
+			goto err1;
+		}
+	} else if (qpn != 0) {
+		if (unlikely(!pkey_match(pkey,
+		    port->pkey_tbl[qp->attr.pkey_index]))) {
+			pr_warn("bad pkey = 0x%0x\n", pkey);
+			spin_lock_bh(&port->port_lock);
+			port->attr.bad_pkey_cntr
+				= (port->attr.bad_pkey_cntr >= 0xffff) ?
+				   0xffff :
+				   port->attr.bad_pkey_cntr + 1;
+			spin_unlock_bh(&port->port_lock);
+			goto err1;
+		}
+		pkt->pkey_index = qp->attr.pkey_index;
+	}
+
+	if (qp_type(qp) == IB_QPT_UD && qpn != 0 && pkt->mask) {
+		u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
+		if (unlikely(deth_qkey(pkt) != qkey)) {
+			pr_warn("bad qkey, got 0x%x expected 0x%x\n",
+				deth_qkey(pkt), qkey);
+			spin_lock_bh(&port->port_lock);
+			port->attr.qkey_viol_cntr
+				= (port->attr.qkey_viol_cntr >= 0xffff) ?
+				   0xffff :
+				   port->attr.qkey_viol_cntr + 1;
+			spin_unlock_bh(&port->port_lock);
+			goto err1;
+		}
+	}
+
+	return 0;
+
+err1:
+	return -EINVAL;
+}
+
+static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+		      struct rxe_qp *qp)
+{
+	struct rxe_port *port = &rxe->port[pkt->port_num - 1];
+	union ib_gid *sgid;
+	union ib_gid *dgid;
+
+	if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
+		goto done;
+
+	if (unlikely(pkt->port_num != qp->attr.port_num)) {
+		pr_warn("port %d != qp port %d\n",
+			 pkt->port_num, qp->attr.port_num);
+		goto err1;
+	}
+
+	if ((pkt->mask & RXE_GRH_MASK) == 0) {
+		if (unlikely(qp->pri_av.attr.ah_flags & IB_AH_GRH)) {
+			pr_warn("no grh for global qp\n");
+			goto err1;
+		} else
+			goto done;
+	}
+
+	sgid = grh_sgid(pkt);
+	dgid = grh_dgid(pkt);
+
+	if (unlikely((qp->pri_av.attr.ah_flags & IB_AH_GRH) == 0)) {
+		pr_warn("grh for local qp\n");
+		goto err1;
+	}
+
+	if (unlikely(dgid->global.subnet_prefix == 0 &&
+	    be64_to_cpu(dgid->global.interface_id) <= 1)) {
+		pr_warn("bad dgid, subnet_prefix = 0\n");
+		goto err1;
+	}
+
+	if (unlikely(sgid->raw[0] == 0xff)) {
+		pr_warn("bad sgid, multicast gid\n");
+		goto err1;
+	}
+
+	if (unlikely(sgid->global.subnet_prefix == 0 &&
+	    be64_to_cpu(sgid->global.interface_id) <= 1)) {
+		pr_warn("bad sgid, subnet prefix = 0 or 1\n");
+		goto err1;
+	}
+
+	if (unlikely(dgid->global.interface_id !=
+	    port->guid_tbl[qp->pri_av.attr.grh.sgid_index])) {
+		pr_warn("bad dgid, doesn't match qp\n");
+		goto err1;
+	}
+
+	if (unlikely(sgid->global.interface_id !=
+	    qp->pri_av.attr.grh.dgid.global.interface_id)) {
+		pr_warn("bad sgid, doesn't match qp\n");
+		goto err1;
+	}
+done:
+	return 0;
+
+err1:
+	return -EINVAL;
+}
+
+static int hdr_check(struct rxe_pkt_info *pkt)
+{
+	struct rxe_dev *rxe = pkt->rxe;
+	struct rxe_port *port = &rxe->port[pkt->port_num - 1];
+	struct rxe_qp *qp = NULL;
+	union ib_gid *dgid = NULL;
+	u32 qpn = bth_qpn(pkt);
+	int index;
+	int err;
+
+	if (unlikely(bth_tver(pkt) != BTH_TVER)) {
+		pr_warn("bad tver\n");
+		goto err1;
+	}
+
+	if (qpn != IB_MULTICAST_QPN) {
+		index = (qpn == 0) ? port->qp_smi_index :
+			((qpn == 1) ? port->qp_gsi_index : qpn);
+		qp = rxe_pool_get_index(&rxe->qp_pool, index);
+		if (unlikely(!qp)) {
+			pr_warn("no qp matches qpn 0x%x\n", qpn);
+			goto err1;
+		}
+
+		err = check_type_state(rxe, pkt, qp);
+		if (unlikely(err))
+			goto err2;
+	}
+
+	if (pkt->mask & RXE_GRH_MASK) {
+		dgid = grh_dgid(pkt);
+
+		if (unlikely(grh_next_hdr(pkt) != GRH_RXE_NEXT_HDR)) {
+			pr_warn("bad next hdr\n");
+			goto err2;
+		}
+
+		if (unlikely(grh_ipver(pkt) != GRH_IPV6)) {
+			pr_warn("bad ipver\n");
+			goto err2;
+		}
+	}
+
+	if (qpn != IB_MULTICAST_QPN) {
+		err = check_addr(rxe, pkt, qp);
+		if (unlikely(err))
+			goto err2;
+
+		err = check_keys(rxe, pkt, qpn, qp);
+		if (unlikely(err))
+			goto err2;
+	} else {
+		if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
+			pr_warn("no grh for mcast qpn\n");
+			goto err1;
+		}
+		if (unlikely(dgid->raw[0] != 0xff)) {
+			pr_warn("bad dgid for mcast qpn\n");
+			goto err1;
+		}
+	}
+
+	pkt->qp = qp;
+	return 0;
+
+err2:
+	if (qp)
+		rxe_drop_ref(qp);
+err1:
+	return -EINVAL;
+}
+
+static inline void rxe_rcv_pkt(struct rxe_dev *rxe,
+			       struct rxe_pkt_info *pkt,
+			       struct sk_buff *skb)
+{
+	if (pkt->mask & RXE_REQ_MASK)
+		rxe_resp_queue_pkt(rxe, pkt->qp, skb);
+	else
+		rxe_comp_queue_pkt(rxe, pkt->qp, skb);
+}
+
+static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
+{
+	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+	struct rxe_mc_grp *mcg;
+	struct list_head *l;
+	struct sk_buff *skb_copy;
+	struct rxe_mc_elem *mce;
+	struct rxe_qp *qp;
+	int err;
+
+	/* lookup mcast group corresponding to mgid, takes a ref */
+	mcg = rxe_pool_get_key(&rxe->mc_grp_pool, grh_dgid(pkt));
+	if (!mcg)
+		goto err1;	/* mcast group not registered */
+
+	spin_lock_bh(&mcg->mcg_lock);
+
+	list_for_each(l, &mcg->qp_list) {
+		mce = container_of(l, struct rxe_mc_elem, qp_list);
+		qp = mce->qp;
+		pkt = SKB_TO_PKT(skb);
+
+		/* validate qp for incoming packet */
+		err = check_type_state(rxe, pkt, qp);
+		if (err)
+			continue;
+
+		err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
+		if (err)
+			continue;
+
+		/* if *not* the last qp in the list
+		   make a copy of the skb to post to the next qp */
+		skb_copy = (l->next != &mcg->qp_list) ?
+				skb_clone(skb, GFP_KERNEL) : NULL;
+
+		pkt->qp = qp;
+		rxe_add_ref(qp);
+		rxe_rcv_pkt(rxe, pkt, skb);
+
+		skb = skb_copy;
+		if (!skb)
+			break;
+	}
+
+	spin_unlock_bh(&mcg->mcg_lock);
+
+	rxe_drop_ref(mcg);	/* drop ref from rxe_pool_get_key. */
+
+err1:
+	if (skb)
+		kfree_skb(skb);
+}
+
+/* rxe_rcv is called from the interface driver
+ * on entry
+ *	pkt->rxe	= rdma device
+ *	pkt->port_num	= rdma device port
+ * For rxe_net:
+ *	pkt->mask	= RXE_GRH_MASK
+ *	pkt->hdr	= &grh	with no lrh
+ * For IB transport (e.g. rxe_sample)
+ *	pkt->mask	= RXE_LRH_MASK
+ *	pkt->hdr	= &lrh with optional grh
+ */
+int rxe_rcv(struct sk_buff *skb)
+{
+	int err;
+	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+	struct rxe_dev *rxe = pkt->rxe;
+
+	pkt->offset = 0;
+
+	if (pkt->mask & RXE_LRH_MASK) {
+		unsigned int length = __lrh_length(pkt->hdr);
+		unsigned int lnh = __lrh_lnh(pkt->hdr);
+
+		if (skb->len < RXE_LRH_BYTES)
+			goto drop;
+
+		if (lnh < LRH_LNH_IBA_LOC)
+			goto drop;
+
+		pkt->paylen = 4*length - RXE_LRH_BYTES;
+		pkt->offset += RXE_LRH_BYTES;
+
+		if (lnh == LRH_LNH_IBA_GBL)
+			pkt->mask |= RXE_GRH_MASK;
+	}
+
+	if (pkt->mask & RXE_GRH_MASK) {
+		if (skb->len < pkt->offset + RXE_GRH_BYTES)
+			goto drop;
+
+		pkt->paylen = __grh_paylen(pkt->hdr);
+		pkt->offset += RXE_GRH_BYTES;
+	}
+
+	if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
+		goto drop;
+
+	pkt->opcode = bth_opcode(pkt);
+	pkt->psn = bth_psn(pkt);
+	pkt->qp = NULL;
+	pkt->mask |= rxe_opcode[pkt->opcode].mask;
+
+	if (unlikely(skb->len < header_size(pkt)))
+		goto drop;
+
+	err = hdr_check(pkt);
+	if (unlikely(err))
+		goto drop;
+
+	if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
+		rxe_rcv_mcast_pkt(rxe, skb);
+	else
+		rxe_rcv_pkt(rxe, pkt, skb);
+
+	return 0;
+
+drop:
+	if (pkt->qp)
+		rxe_drop_ref(pkt->qp);
+
+	kfree_skb(skb);
+	return 0;
+}
+EXPORT_SYMBOL(rxe_rcv);


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