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/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 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 & IB_OPCODE_RC) != 0)) {
pr_warn_ratelimited("bad qp type\n");
goto err1;
}
break;
case IB_QPT_UC:
if (unlikely(!(pkt->opcode & IB_OPCODE_UC))) {
pr_warn_ratelimited("bad qp type\n");
goto err1;
}
break;
case IB_QPT_UD:
case IB_QPT_SMI:
case IB_QPT_GSI:
if (unlikely(!(pkt->opcode & IB_OPCODE_UD))) {
pr_warn_ratelimited("bad qp type\n");
goto err1;
}
break;
default:
pr_warn_ratelimited("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 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)
{
int i;
int found_pkey = 0;
struct rxe_port *port = &rxe->port;
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_ratelimited("bad pkey = 0x%x\n", pkey);
set_bad_pkey_cntr(port);
goto err1;
}
} else if (qpn != 0) {
if (unlikely(!pkey_match(pkey,
port->pkey_tbl[qp->attr.pkey_index]
))) {
pr_warn_ratelimited("bad pkey = 0x%0x\n", pkey);
set_bad_pkey_cntr(port);
goto err1;
}
pkt->pkey_index = qp->attr.pkey_index;
}
if ((qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) &&
qpn != 0 && pkt->mask) {
u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
if (unlikely(deth_qkey(pkt) != qkey)) {
pr_warn_ratelimited("bad qkey, got 0x%x expected 0x%x for qpn 0x%x\n",
deth_qkey(pkt), qkey, qpn);
set_qkey_viol_cntr(port);
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 sk_buff *skb = PKT_TO_SKB(pkt);
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_ratelimited("port %d != qp port %d\n",
pkt->port_num, qp->attr.port_num);
goto err1;
}
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) {
pr_warn_ratelimited("dst addr %pI4 != qp source addr %pI4\n",
&ip_hdr(skb)->daddr,
&saddr->s_addr);
goto err1;
}
if (ip_hdr(skb)->saddr != daddr->s_addr) {
pr_warn_ratelimited("source addr %pI4 != qp dst addr %pI4\n",
&ip_hdr(skb)->saddr,
&daddr->s_addr);
goto err1;
}
} 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))) {
pr_warn_ratelimited("dst addr %pI6 != qp source addr %pI6\n",
&ipv6_hdr(skb)->daddr, saddr);
goto err1;
}
if (memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr))) {
pr_warn_ratelimited("source addr %pI6 != qp dst addr %pI6\n",
&ipv6_hdr(skb)->saddr, daddr);
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;
struct rxe_qp *qp = NULL;
u32 qpn = bth_qpn(pkt);
int index;
int err;
if (unlikely(bth_tver(pkt) != BTH_TVER)) {
pr_warn_ratelimited("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_ratelimited("no qp matches qpn 0x%x\n", qpn);
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)) {
pr_warn_ratelimited("no grh 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 sk_buff *skb_copy;
struct rxe_mc_elem *mce;
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_pool_get_key(&rxe->mc_grp_pool, &dgid);
if (!mcg)
goto err1; /* mcast group not registered */
spin_lock_bh(&mcg->mcg_lock);
list_for_each_entry(mce, &mcg->qp_list, 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 = (mce->qp_list.next != &mcg->qp_list) ?
skb_clone(skb, GFP_ATOMIC) : 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);
}
static int rxe_match_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
{
union ib_gid dgid;
union ib_gid *pdgid;
u16 index;
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;
}
return ib_find_cached_gid_by_port(&rxe->ib_dev, pdgid,
IB_GID_TYPE_ROCE_UDP_ENCAP,
1, rxe->ndev, &index);
}
/* rxe_rcv is called from the interface driver */
int rxe_rcv(struct sk_buff *skb)
{
int err;
struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
struct rxe_dev *rxe = pkt->rxe;
__be32 *icrcp;
u32 calc_icrc, pack_icrc;
pkt->offset = 0;
if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
goto drop;
if (unlikely(rxe_match_dgid(rxe, skb) < 0)) {
pr_warn_ratelimited("failed matching dgid\n");
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;
/* Verify ICRC */
icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
pack_icrc = be32_to_cpu(*icrcp);
calc_icrc = rxe_icrc_hdr(pkt, skb);
calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
payload_size(pkt));
calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
if (unlikely(calc_icrc != pack_icrc)) {
if (skb->protocol == htons(ETH_P_IPV6))
pr_warn_ratelimited("bad ICRC from %pI6c\n",
&ipv6_hdr(skb)->saddr);
else if (skb->protocol == htons(ETH_P_IP))
pr_warn_ratelimited("bad ICRC from %pI4\n",
&ip_hdr(skb)->saddr);
else
pr_warn_ratelimited("bad ICRC from unknown\n");
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(rxe, pkt, skb);
return 0;
drop:
if (pkt->qp)
rxe_drop_ref(pkt->qp);
kfree_skb(skb);
return 0;
}
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