mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 00:56:44 +07:00
fb4f79264c
CLC proposal messages of future SMCD versions could be larger than SMCD
V1 CLC proposal messages.
To enable toleration in SMC V1 the receival of CLC proposal messages
is adapted:
* accept larger length values in CLC proposal
* check trailing eye catcher for incoming CLC proposal with V1 length only
* receive the whole CLC proposal even in cases it does not fit into the
V1 buffer
Fixes: e7b7a64a84
("smc: support variable CLC proposal messages")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
624 lines
19 KiB
C
624 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* CLC (connection layer control) handshake over initial TCP socket to
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* prepare for RDMA traffic
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*
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* Copyright IBM Corp. 2016, 2018
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/in.h>
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#include <linux/inetdevice.h>
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#include <linux/if_ether.h>
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#include <linux/sched/signal.h>
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#include <net/addrconf.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include "smc.h"
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#include "smc_core.h"
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#include "smc_clc.h"
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#include "smc_ib.h"
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#include "smc_ism.h"
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#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
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#define SMC_CLC_RECV_BUF_LEN 100
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/* eye catcher "SMCR" EBCDIC for CLC messages */
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static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
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/* eye catcher "SMCD" EBCDIC for CLC messages */
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static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
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/* check if received message has a correct header length and contains valid
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* heading and trailing eyecatchers
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*/
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static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
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{
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struct smc_clc_msg_proposal_prefix *pclc_prfx;
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struct smc_clc_msg_accept_confirm *clc;
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struct smc_clc_msg_proposal *pclc;
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struct smc_clc_msg_decline *dclc;
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struct smc_clc_msg_trail *trl;
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if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
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memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
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return false;
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switch (clcm->type) {
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case SMC_CLC_PROPOSAL:
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pclc = (struct smc_clc_msg_proposal *)clcm;
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pclc_prfx = smc_clc_proposal_get_prefix(pclc);
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if (ntohs(pclc->hdr.length) <
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sizeof(*pclc) + ntohs(pclc->iparea_offset) +
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sizeof(*pclc_prfx) +
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pclc_prfx->ipv6_prefixes_cnt *
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sizeof(struct smc_clc_ipv6_prefix) +
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sizeof(*trl))
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return false;
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trl = (struct smc_clc_msg_trail *)
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((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
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break;
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case SMC_CLC_ACCEPT:
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case SMC_CLC_CONFIRM:
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if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D)
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return false;
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clc = (struct smc_clc_msg_accept_confirm *)clcm;
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if ((clcm->path == SMC_TYPE_R &&
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ntohs(clc->hdr.length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
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(clcm->path == SMC_TYPE_D &&
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ntohs(clc->hdr.length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
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return false;
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trl = (struct smc_clc_msg_trail *)
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((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl));
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break;
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case SMC_CLC_DECLINE:
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dclc = (struct smc_clc_msg_decline *)clcm;
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if (ntohs(dclc->hdr.length) != sizeof(*dclc))
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return false;
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trl = &dclc->trl;
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break;
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default:
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return false;
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}
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if (check_trl &&
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memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
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memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
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return false;
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return true;
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}
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/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
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static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
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const struct in_ifaddr *ifa;
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if (!in_dev)
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return -ENODEV;
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in_dev_for_each_ifa_rcu(ifa, in_dev) {
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if (!inet_ifa_match(ipv4, ifa))
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continue;
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prop->prefix_len = inet_mask_len(ifa->ifa_mask);
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prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
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/* prop->ipv6_prefixes_cnt = 0; already done by memset before */
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return 0;
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}
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return -ENOENT;
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}
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/* fill CLC proposal msg with ipv6 prefixes from device */
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static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
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struct smc_clc_msg_proposal_prefix *prop,
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struct smc_clc_ipv6_prefix *ipv6_prfx)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
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struct inet6_ifaddr *ifa;
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int cnt = 0;
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if (!in6_dev)
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return -ENODEV;
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/* use a maximum of 8 IPv6 prefixes from device */
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list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
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if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
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continue;
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ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
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&ifa->addr, ifa->prefix_len);
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ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
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cnt++;
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if (cnt == SMC_CLC_MAX_V6_PREFIX)
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break;
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}
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prop->ipv6_prefixes_cnt = cnt;
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if (cnt)
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return 0;
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#endif
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return -ENOENT;
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}
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/* retrieve and set prefixes in CLC proposal msg */
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static int smc_clc_prfx_set(struct socket *clcsock,
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struct smc_clc_msg_proposal_prefix *prop,
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struct smc_clc_ipv6_prefix *ipv6_prfx)
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{
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struct dst_entry *dst = sk_dst_get(clcsock->sk);
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struct sockaddr_storage addrs;
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struct sockaddr_in6 *addr6;
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struct sockaddr_in *addr;
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int rc = -ENOENT;
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memset(prop, 0, sizeof(*prop));
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if (!dst) {
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rc = -ENOTCONN;
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goto out;
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}
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if (!dst->dev) {
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rc = -ENODEV;
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goto out_rel;
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}
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/* get address to which the internal TCP socket is bound */
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kernel_getsockname(clcsock, (struct sockaddr *)&addrs);
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/* analyze IP specific data of net_device belonging to TCP socket */
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addr6 = (struct sockaddr_in6 *)&addrs;
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rcu_read_lock();
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if (addrs.ss_family == PF_INET) {
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/* IPv4 */
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addr = (struct sockaddr_in *)&addrs;
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rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
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} else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
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/* mapped IPv4 address - peer is IPv4 only */
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rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
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prop);
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} else {
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/* IPv6 */
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rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
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}
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rcu_read_unlock();
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out_rel:
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dst_release(dst);
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out:
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return rc;
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}
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/* match ipv4 addrs of dev against addr in CLC proposal */
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static int smc_clc_prfx_match4_rcu(struct net_device *dev,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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const struct in_ifaddr *ifa;
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if (!in_dev)
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return -ENODEV;
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in_dev_for_each_ifa_rcu(ifa, in_dev) {
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if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
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inet_ifa_match(prop->outgoing_subnet, ifa))
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return 0;
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}
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return -ENOENT;
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}
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/* match ipv6 addrs of dev against addrs in CLC proposal */
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static int smc_clc_prfx_match6_rcu(struct net_device *dev,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet6_dev *in6_dev = __in6_dev_get(dev);
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struct smc_clc_ipv6_prefix *ipv6_prfx;
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struct inet6_ifaddr *ifa;
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int i, max;
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if (!in6_dev)
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return -ENODEV;
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/* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
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ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
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max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
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list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
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if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
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continue;
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for (i = 0; i < max; i++) {
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if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
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ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
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ifa->prefix_len))
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return 0;
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}
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}
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#endif
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return -ENOENT;
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}
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/* check if proposed prefixes match one of our device prefixes */
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int smc_clc_prfx_match(struct socket *clcsock,
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struct smc_clc_msg_proposal_prefix *prop)
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{
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struct dst_entry *dst = sk_dst_get(clcsock->sk);
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int rc;
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if (!dst) {
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rc = -ENOTCONN;
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goto out;
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}
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if (!dst->dev) {
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rc = -ENODEV;
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goto out_rel;
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}
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rcu_read_lock();
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if (!prop->ipv6_prefixes_cnt)
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rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
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else
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rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
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rcu_read_unlock();
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out_rel:
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dst_release(dst);
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out:
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return rc;
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}
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/* Wait for data on the tcp-socket, analyze received data
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* Returns:
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* 0 if success and it was not a decline that we received.
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* SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
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* clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
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*/
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int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
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u8 expected_type, unsigned long timeout)
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{
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long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
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struct sock *clc_sk = smc->clcsock->sk;
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struct smc_clc_msg_hdr *clcm = buf;
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struct msghdr msg = {NULL, 0};
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int reason_code = 0;
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struct kvec vec = {buf, buflen};
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int len, datlen, recvlen;
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bool check_trl = true;
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int krflags;
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/* peek the first few bytes to determine length of data to receive
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* so we don't consume any subsequent CLC message or payload data
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* in the TCP byte stream
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*/
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/*
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* Caller must make sure that buflen is no less than
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* sizeof(struct smc_clc_msg_hdr)
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*/
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krflags = MSG_PEEK | MSG_WAITALL;
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clc_sk->sk_rcvtimeo = timeout;
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iov_iter_kvec(&msg.msg_iter, READ, &vec, 1,
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sizeof(struct smc_clc_msg_hdr));
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len = sock_recvmsg(smc->clcsock, &msg, krflags);
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if (signal_pending(current)) {
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reason_code = -EINTR;
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clc_sk->sk_err = EINTR;
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smc->sk.sk_err = EINTR;
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goto out;
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}
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if (clc_sk->sk_err) {
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reason_code = -clc_sk->sk_err;
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if (clc_sk->sk_err == EAGAIN &&
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expected_type == SMC_CLC_DECLINE)
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clc_sk->sk_err = 0; /* reset for fallback usage */
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else
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smc->sk.sk_err = clc_sk->sk_err;
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goto out;
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}
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if (!len) { /* peer has performed orderly shutdown */
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smc->sk.sk_err = ECONNRESET;
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reason_code = -ECONNRESET;
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goto out;
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}
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if (len < 0) {
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if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
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smc->sk.sk_err = -len;
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reason_code = len;
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goto out;
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}
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datlen = ntohs(clcm->length);
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if ((len < sizeof(struct smc_clc_msg_hdr)) ||
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(clcm->version < SMC_CLC_V1) ||
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((clcm->type != SMC_CLC_DECLINE) &&
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(clcm->type != expected_type))) {
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smc->sk.sk_err = EPROTO;
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reason_code = -EPROTO;
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goto out;
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}
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if (clcm->type == SMC_CLC_PROPOSAL && clcm->path == SMC_TYPE_N)
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reason_code = SMC_CLC_DECL_VERSMISMAT; /* just V2 offered */
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/* receive the complete CLC message */
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memset(&msg, 0, sizeof(struct msghdr));
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if (datlen > buflen) {
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check_trl = false;
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recvlen = buflen;
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} else {
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recvlen = datlen;
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}
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iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen);
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krflags = MSG_WAITALL;
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len = sock_recvmsg(smc->clcsock, &msg, krflags);
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if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
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smc->sk.sk_err = EPROTO;
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reason_code = -EPROTO;
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goto out;
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}
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datlen -= len;
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while (datlen) {
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u8 tmp[SMC_CLC_RECV_BUF_LEN];
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vec.iov_base = &tmp;
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vec.iov_len = SMC_CLC_RECV_BUF_LEN;
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/* receive remaining proposal message */
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recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
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SMC_CLC_RECV_BUF_LEN : datlen;
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iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen);
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len = sock_recvmsg(smc->clcsock, &msg, krflags);
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datlen -= len;
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}
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if (clcm->type == SMC_CLC_DECLINE) {
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struct smc_clc_msg_decline *dclc;
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dclc = (struct smc_clc_msg_decline *)clcm;
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reason_code = SMC_CLC_DECL_PEERDECL;
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smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
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if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
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smc->conn.lgr->sync_err = 1;
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smc_lgr_terminate_sched(smc->conn.lgr);
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}
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}
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out:
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clc_sk->sk_rcvtimeo = rcvtimeo;
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return reason_code;
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}
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/* send CLC DECLINE message across internal TCP socket */
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int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
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{
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struct smc_clc_msg_decline dclc;
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struct msghdr msg;
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struct kvec vec;
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int len;
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memset(&dclc, 0, sizeof(dclc));
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memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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dclc.hdr.type = SMC_CLC_DECLINE;
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dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
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dclc.hdr.version = SMC_CLC_V1;
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dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0;
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if ((!smc->conn.lgr || !smc->conn.lgr->is_smcd) &&
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smc_ib_is_valid_local_systemid())
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memcpy(dclc.id_for_peer, local_systemid,
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sizeof(local_systemid));
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dclc.peer_diagnosis = htonl(peer_diag_info);
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memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &dclc;
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vec.iov_len = sizeof(struct smc_clc_msg_decline);
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len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
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sizeof(struct smc_clc_msg_decline));
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if (len < 0 || len < sizeof(struct smc_clc_msg_decline))
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len = -EPROTO;
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return len > 0 ? 0 : len;
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}
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/* send CLC PROPOSAL message across internal TCP socket */
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int smc_clc_send_proposal(struct smc_sock *smc, int smc_type,
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struct smc_init_info *ini)
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{
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struct smc_clc_ipv6_prefix ipv6_prfx[SMC_CLC_MAX_V6_PREFIX];
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struct smc_clc_msg_proposal_prefix pclc_prfx;
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struct smc_clc_msg_smcd pclc_smcd;
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struct smc_clc_msg_proposal pclc;
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struct smc_clc_msg_trail trl;
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int len, i, plen, rc;
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int reason_code = 0;
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struct kvec vec[5];
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struct msghdr msg;
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/* retrieve ip prefixes for CLC proposal msg */
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rc = smc_clc_prfx_set(smc->clcsock, &pclc_prfx, ipv6_prfx);
|
|
if (rc)
|
|
return SMC_CLC_DECL_CNFERR; /* configuration error */
|
|
|
|
/* send SMC Proposal CLC message */
|
|
plen = sizeof(pclc) + sizeof(pclc_prfx) +
|
|
(pclc_prfx.ipv6_prefixes_cnt * sizeof(ipv6_prfx[0])) +
|
|
sizeof(trl);
|
|
memset(&pclc, 0, sizeof(pclc));
|
|
memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
pclc.hdr.type = SMC_CLC_PROPOSAL;
|
|
pclc.hdr.version = SMC_CLC_V1; /* SMC version */
|
|
pclc.hdr.path = smc_type;
|
|
if (smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B) {
|
|
/* add SMC-R specifics */
|
|
memcpy(pclc.lcl.id_for_peer, local_systemid,
|
|
sizeof(local_systemid));
|
|
memcpy(&pclc.lcl.gid, ini->ib_gid, SMC_GID_SIZE);
|
|
memcpy(&pclc.lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
|
|
ETH_ALEN);
|
|
pclc.iparea_offset = htons(0);
|
|
}
|
|
if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) {
|
|
/* add SMC-D specifics */
|
|
memset(&pclc_smcd, 0, sizeof(pclc_smcd));
|
|
plen += sizeof(pclc_smcd);
|
|
pclc.iparea_offset = htons(SMC_CLC_PROPOSAL_MAX_OFFSET);
|
|
pclc_smcd.gid = ini->ism_dev->local_gid;
|
|
}
|
|
pclc.hdr.length = htons(plen);
|
|
|
|
memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
memset(&msg, 0, sizeof(msg));
|
|
i = 0;
|
|
vec[i].iov_base = &pclc;
|
|
vec[i++].iov_len = sizeof(pclc);
|
|
if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) {
|
|
vec[i].iov_base = &pclc_smcd;
|
|
vec[i++].iov_len = sizeof(pclc_smcd);
|
|
}
|
|
vec[i].iov_base = &pclc_prfx;
|
|
vec[i++].iov_len = sizeof(pclc_prfx);
|
|
if (pclc_prfx.ipv6_prefixes_cnt > 0) {
|
|
vec[i].iov_base = &ipv6_prfx[0];
|
|
vec[i++].iov_len = pclc_prfx.ipv6_prefixes_cnt *
|
|
sizeof(ipv6_prfx[0]);
|
|
}
|
|
vec[i].iov_base = &trl;
|
|
vec[i++].iov_len = sizeof(trl);
|
|
/* due to the few bytes needed for clc-handshake this cannot block */
|
|
len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
|
|
if (len < 0) {
|
|
smc->sk.sk_err = smc->clcsock->sk->sk_err;
|
|
reason_code = -smc->sk.sk_err;
|
|
} else if (len < (int)sizeof(pclc)) {
|
|
reason_code = -ENETUNREACH;
|
|
smc->sk.sk_err = -reason_code;
|
|
}
|
|
|
|
return reason_code;
|
|
}
|
|
|
|
/* send CLC CONFIRM message across internal TCP socket */
|
|
int smc_clc_send_confirm(struct smc_sock *smc)
|
|
{
|
|
struct smc_connection *conn = &smc->conn;
|
|
struct smc_clc_msg_accept_confirm cclc;
|
|
struct smc_link *link;
|
|
int reason_code = 0;
|
|
struct msghdr msg;
|
|
struct kvec vec;
|
|
int len;
|
|
|
|
/* send SMC Confirm CLC msg */
|
|
memset(&cclc, 0, sizeof(cclc));
|
|
cclc.hdr.type = SMC_CLC_CONFIRM;
|
|
cclc.hdr.version = SMC_CLC_V1; /* SMC version */
|
|
if (smc->conn.lgr->is_smcd) {
|
|
/* SMC-D specific settings */
|
|
memcpy(cclc.hdr.eyecatcher, SMCD_EYECATCHER,
|
|
sizeof(SMCD_EYECATCHER));
|
|
cclc.hdr.path = SMC_TYPE_D;
|
|
cclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
|
|
cclc.gid = conn->lgr->smcd->local_gid;
|
|
cclc.token = conn->rmb_desc->token;
|
|
cclc.dmbe_size = conn->rmbe_size_short;
|
|
cclc.dmbe_idx = 0;
|
|
memcpy(&cclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
|
|
memcpy(cclc.smcd_trl.eyecatcher, SMCD_EYECATCHER,
|
|
sizeof(SMCD_EYECATCHER));
|
|
} else {
|
|
/* SMC-R specific settings */
|
|
link = conn->lnk;
|
|
memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER,
|
|
sizeof(SMC_EYECATCHER));
|
|
cclc.hdr.path = SMC_TYPE_R;
|
|
cclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
|
|
memcpy(cclc.lcl.id_for_peer, local_systemid,
|
|
sizeof(local_systemid));
|
|
memcpy(&cclc.lcl.gid, link->gid, SMC_GID_SIZE);
|
|
memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
|
|
ETH_ALEN);
|
|
hton24(cclc.qpn, link->roce_qp->qp_num);
|
|
cclc.rmb_rkey =
|
|
htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey);
|
|
cclc.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
|
|
cclc.rmbe_alert_token = htonl(conn->alert_token_local);
|
|
cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
|
|
cclc.rmbe_size = conn->rmbe_size_short;
|
|
cclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
|
|
(conn->rmb_desc->sgt[link->link_idx].sgl));
|
|
hton24(cclc.psn, link->psn_initial);
|
|
memcpy(cclc.smcr_trl.eyecatcher, SMC_EYECATCHER,
|
|
sizeof(SMC_EYECATCHER));
|
|
}
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
vec.iov_base = &cclc;
|
|
vec.iov_len = ntohs(cclc.hdr.length);
|
|
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
|
|
ntohs(cclc.hdr.length));
|
|
if (len < ntohs(cclc.hdr.length)) {
|
|
if (len >= 0) {
|
|
reason_code = -ENETUNREACH;
|
|
smc->sk.sk_err = -reason_code;
|
|
} else {
|
|
smc->sk.sk_err = smc->clcsock->sk->sk_err;
|
|
reason_code = -smc->sk.sk_err;
|
|
}
|
|
}
|
|
return reason_code;
|
|
}
|
|
|
|
/* send CLC ACCEPT message across internal TCP socket */
|
|
int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
|
|
{
|
|
struct smc_connection *conn = &new_smc->conn;
|
|
struct smc_clc_msg_accept_confirm aclc;
|
|
struct smc_link *link;
|
|
struct msghdr msg;
|
|
struct kvec vec;
|
|
int len;
|
|
|
|
memset(&aclc, 0, sizeof(aclc));
|
|
aclc.hdr.type = SMC_CLC_ACCEPT;
|
|
aclc.hdr.version = SMC_CLC_V1; /* SMC version */
|
|
if (srv_first_contact)
|
|
aclc.hdr.flag = 1;
|
|
|
|
if (new_smc->conn.lgr->is_smcd) {
|
|
/* SMC-D specific settings */
|
|
aclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
|
|
memcpy(aclc.hdr.eyecatcher, SMCD_EYECATCHER,
|
|
sizeof(SMCD_EYECATCHER));
|
|
aclc.hdr.path = SMC_TYPE_D;
|
|
aclc.gid = conn->lgr->smcd->local_gid;
|
|
aclc.token = conn->rmb_desc->token;
|
|
aclc.dmbe_size = conn->rmbe_size_short;
|
|
aclc.dmbe_idx = 0;
|
|
memcpy(&aclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
|
|
memcpy(aclc.smcd_trl.eyecatcher, SMCD_EYECATCHER,
|
|
sizeof(SMCD_EYECATCHER));
|
|
} else {
|
|
/* SMC-R specific settings */
|
|
aclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
|
|
memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER,
|
|
sizeof(SMC_EYECATCHER));
|
|
aclc.hdr.path = SMC_TYPE_R;
|
|
link = conn->lnk;
|
|
memcpy(aclc.lcl.id_for_peer, local_systemid,
|
|
sizeof(local_systemid));
|
|
memcpy(&aclc.lcl.gid, link->gid, SMC_GID_SIZE);
|
|
memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1],
|
|
ETH_ALEN);
|
|
hton24(aclc.qpn, link->roce_qp->qp_num);
|
|
aclc.rmb_rkey =
|
|
htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey);
|
|
aclc.rmbe_idx = 1; /* as long as 1 RMB = 1 RMBE */
|
|
aclc.rmbe_alert_token = htonl(conn->alert_token_local);
|
|
aclc.qp_mtu = link->path_mtu;
|
|
aclc.rmbe_size = conn->rmbe_size_short,
|
|
aclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
|
|
(conn->rmb_desc->sgt[link->link_idx].sgl));
|
|
hton24(aclc.psn, link->psn_initial);
|
|
memcpy(aclc.smcr_trl.eyecatcher, SMC_EYECATCHER,
|
|
sizeof(SMC_EYECATCHER));
|
|
}
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
vec.iov_base = &aclc;
|
|
vec.iov_len = ntohs(aclc.hdr.length);
|
|
len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1,
|
|
ntohs(aclc.hdr.length));
|
|
if (len < ntohs(aclc.hdr.length))
|
|
len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
|
|
|
|
return len > 0 ? 0 : len;
|
|
}
|