[PATCH rdma-next 19/29] IB/rxe: Received packets handling

Moni Shoua
2016-06-02T16:57:27Z

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

Signed-off-by: Kamal Heib <kamalh-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Moni Shoua <monis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/hw/rxe/rxe_recv.c | 420 +++++++++++++++++++++++++++++++++++
1 file changed, 420 insertions(+)
create mode 100644 drivers/infiniband/hw/rxe/rxe_recv.c

diff --git a/drivers/infiniband/hw/rxe/rxe_recv.c b/drivers/infiniband/hw/rxe/rxe_recv.c
new file mode 100644
index 0000000..92ee31f
--- /dev/null
+++ b/drivers/infiniband/hw/rxe/rxe_recv.c
@@ -0,0 +1,420 @@
+/*
+ * 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[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_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[pkt->port_num - 1];
+ 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_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);
+}
+
+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 = crc32_le(calc_icrc, (u8 *)payload_addr(pkt), payload_size(pkt));
+ calc_icrc = cpu_to_be32(~calc_icrc);
+ if (unlikely(calc_icrc != pack_icrc)) {
+ char saddr[sizeof(struct in6_addr)];
+
+ if (skb->protocol == htons(ETH_P_IPV6))
+ sprintf(saddr, "%pI6", &ipv6_hdr(skb)->saddr);
+ else if (skb->protocol == htons(ETH_P_IP))
+ sprintf(saddr, "%pI4", &ip_hdr(skb)->saddr);
+ else
+ sprintf(saddr, "unknown");
+
+ pr_warn_ratelimited("bad ICRC from %s\n", saddr);
+ 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);
--
1.8.3.1