summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/sw/rxe/rxe_recv.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/infiniband/sw/rxe/rxe_recv.c351
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);
+}