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