1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_recv.c b/drivers/infiniband/sw/rxe/rxe_recv.c
new file mode 100644
index 000000000..434a693cd
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_recv.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ */
+
+#include <linux/skbuff.h>
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+/* check that QP matches packet opcode type and is in a valid state */
+static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+			    struct rxe_qp *qp)
+{
+	unsigned int pkt_type;
+
+	if (unlikely(!qp->valid))
+		return -EINVAL;
+
+	pkt_type = pkt->opcode & 0xe0;
+
+	switch (qp_type(qp)) {
+	case IB_QPT_RC:
+		if (unlikely(pkt_type != IB_OPCODE_RC))
+			return -EINVAL;
+		break;
+	case IB_QPT_UC:
+		if (unlikely(pkt_type != IB_OPCODE_UC))
+			return -EINVAL;
+		break;
+	case IB_QPT_UD:
+	case IB_QPT_GSI:
+		if (unlikely(pkt_type != IB_OPCODE_UD))
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (pkt->mask & RXE_REQ_MASK) {
+		if (unlikely(qp->resp.state != QP_STATE_READY))
+			return -EINVAL;
+	} else if (unlikely(qp->req.state < QP_STATE_READY ||
+				qp->req.state > QP_STATE_DRAINED))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void set_bad_pkey_cntr(struct rxe_port *port)
+{
+	spin_lock_bh(&port->port_lock);
+	port->attr.bad_pkey_cntr = min((u32)0xffff,
+				       port->attr.bad_pkey_cntr + 1);
+	spin_unlock_bh(&port->port_lock);
+}
+
+static void set_qkey_viol_cntr(struct rxe_port *port)
+{
+	spin_lock_bh(&port->port_lock);
+	port->attr.qkey_viol_cntr = min((u32)0xffff,
+					port->attr.qkey_viol_cntr + 1);
+	spin_unlock_bh(&port->port_lock);
+}
+
+static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+		      u32 qpn, struct rxe_qp *qp)
+{
+	struct rxe_port *port = &rxe->port;
+	u16 pkey = bth_pkey(pkt);
+
+	pkt->pkey_index = 0;
+
+	if (!pkey_match(pkey, IB_DEFAULT_PKEY_FULL)) {
+		set_bad_pkey_cntr(port);
+		return -EINVAL;
+	}
+
+	if (qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) {
+		u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
+
+		if (unlikely(deth_qkey(pkt) != qkey)) {
+			set_qkey_viol_cntr(port);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+		      struct rxe_qp *qp)
+{
+	struct sk_buff *skb = PKT_TO_SKB(pkt);
+
+	if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
+		return 0;
+
+	if (unlikely(pkt->port_num != qp->attr.port_num))
+		return -EINVAL;
+
+	if (skb->protocol == htons(ETH_P_IP)) {
+		struct in_addr *saddr =
+			&qp->pri_av.sgid_addr._sockaddr_in.sin_addr;
+		struct in_addr *daddr =
+			&qp->pri_av.dgid_addr._sockaddr_in.sin_addr;
+
+		if ((ip_hdr(skb)->daddr != saddr->s_addr) ||
+		    (ip_hdr(skb)->saddr != daddr->s_addr))
+			return -EINVAL;
+
+	} else if (skb->protocol == htons(ETH_P_IPV6)) {
+		struct in6_addr *saddr =
+			&qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;
+		struct in6_addr *daddr =
+			&qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;
+
+		if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr)) ||
+		    memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr)))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int hdr_check(struct rxe_pkt_info *pkt)
+{
+	struct rxe_dev *rxe = pkt->rxe;
+	struct rxe_port *port = &rxe->port;
+	struct rxe_qp *qp = NULL;
+	u32 qpn = bth_qpn(pkt);
+	int index;
+	int err;
+
+	if (unlikely(bth_tver(pkt) != BTH_TVER))
+		goto err1;
+
+	if (unlikely(qpn == 0))
+		goto err1;
+
+	if (qpn != IB_MULTICAST_QPN) {
+		index = (qpn == 1) ? port->qp_gsi_index : qpn;
+
+		qp = rxe_pool_get_index(&rxe->qp_pool, index);
+		if (unlikely(!qp))
+			goto err1;
+
+		err = check_type_state(rxe, pkt, qp);
+		if (unlikely(err))
+			goto err2;
+
+		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))
+			goto err1;
+	}
+
+	pkt->qp = qp;
+	return 0;
+
+err2:
+	rxe_put(qp);
+err1:
+	return -EINVAL;
+}
+
+static inline void rxe_rcv_pkt(struct rxe_pkt_info *pkt, struct sk_buff *skb)
+{
+	if (pkt->mask & RXE_REQ_MASK)
+		rxe_resp_queue_pkt(pkt->qp, skb);
+	else
+		rxe_comp_queue_pkt(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_mcg *mcg;
+	struct rxe_mca *mca;
+	struct rxe_qp *qp;
+	union ib_gid dgid;
+	int err;
+
+	if (skb->protocol == htons(ETH_P_IP))
+		ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
+				       (struct in6_addr *)&dgid);
+	else if (skb->protocol == htons(ETH_P_IPV6))
+		memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
+
+	/* lookup mcast group corresponding to mgid, takes a ref */
+	mcg = rxe_lookup_mcg(rxe, &dgid);
+	if (!mcg)
+		goto drop;	/* mcast group not registered */
+
+	spin_lock_bh(&rxe->mcg_lock);
+
+	/* this is unreliable datagram service so we let
+	 * failures to deliver a multicast packet to a
+	 * single QP happen and just move on and try
+	 * the rest of them on the list
+	 */
+	list_for_each_entry(mca, &mcg->qp_list, qp_list) {
+		qp = mca->qp;
+
+		/* 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;
+
+		/* for all but the last QP create a new clone of the
+		 * skb and pass to the QP. Pass the original skb to
+		 * the last QP in the list.
+		 */
+		if (mca->qp_list.next != &mcg->qp_list) {
+			struct sk_buff *cskb;
+			struct rxe_pkt_info *cpkt;
+
+			cskb = skb_clone(skb, GFP_ATOMIC);
+			if (unlikely(!cskb))
+				continue;
+
+			if (WARN_ON(!ib_device_try_get(&rxe->ib_dev))) {
+				kfree_skb(cskb);
+				break;
+			}
+
+			cpkt = SKB_TO_PKT(cskb);
+			cpkt->qp = qp;
+			rxe_get(qp);
+			rxe_rcv_pkt(cpkt, cskb);
+		} else {
+			pkt->qp = qp;
+			rxe_get(qp);
+			rxe_rcv_pkt(pkt, skb);
+			skb = NULL;	/* mark consumed */
+		}
+	}
+
+	spin_unlock_bh(&rxe->mcg_lock);
+
+	kref_put(&mcg->ref_cnt, rxe_cleanup_mcg);
+
+	if (likely(!skb))
+		return;
+
+	/* This only occurs if one of the checks fails on the last
+	 * QP in the list above
+	 */
+
+drop:
+	kfree_skb(skb);
+	ib_device_put(&rxe->ib_dev);
+}
+
+/**
+ * rxe_chk_dgid - validate destination IP address
+ * @rxe: rxe device that received packet
+ * @skb: the received packet buffer
+ *
+ * Accept any loopback packets
+ * Extract IP address from packet and
+ * Accept if multicast packet
+ * Accept if matches an SGID table entry
+ */
+static int rxe_chk_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
+{
+	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+	const struct ib_gid_attr *gid_attr;
+	union ib_gid dgid;
+	union ib_gid *pdgid;
+
+	if (pkt->mask & RXE_LOOPBACK_MASK)
+		return 0;
+
+	if (skb->protocol == htons(ETH_P_IP)) {
+		ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
+				       (struct in6_addr *)&dgid);
+		pdgid = &dgid;
+	} else {
+		pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
+	}
+
+	if (rdma_is_multicast_addr((struct in6_addr *)pdgid))
+		return 0;
+
+	gid_attr = rdma_find_gid_by_port(&rxe->ib_dev, pdgid,
+					 IB_GID_TYPE_ROCE_UDP_ENCAP,
+					 1, skb->dev);
+	if (IS_ERR(gid_attr))
+		return PTR_ERR(gid_attr);
+
+	rdma_put_gid_attr(gid_attr);
+	return 0;
+}
+
+/* rxe_rcv is called from the interface driver */
+void rxe_rcv(struct sk_buff *skb)
+{
+	int err;
+	struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+	struct rxe_dev *rxe = pkt->rxe;
+
+	if (unlikely(skb->len < RXE_BTH_BYTES))
+		goto drop;
+
+	if (rxe_chk_dgid(rxe, skb) < 0)
+		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;
+
+	err = rxe_icrc_check(skb, pkt);
+	if (unlikely(err))
+		goto drop;
+
+	rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
+
+	if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
+		rxe_rcv_mcast_pkt(rxe, skb);
+	else
+		rxe_rcv_pkt(pkt, skb);
+
+	return;
+
+drop:
+	if (pkt->qp)
+		rxe_put(pkt->qp);
+
+	kfree_skb(skb);
+	ib_device_put(&rxe->ib_dev);
+}