mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
c0b458a946
Minor conflicts in drivers/net/ethernet/mellanox/mlx5/core/en_rep.c, we had some overlapping changes: 1) In 'net' MLX5E_PARAMS_LOG_{SQ,RQ}_SIZE --> MLX5E_REP_PARAMS_LOG_{SQ,RQ}_SIZE 2) In 'net-next' params->log_rq_size is renamed to be params->log_rq_mtu_frames. 3) In 'net-next' params->hard_mtu is added. Signed-off-by: David S. Miller <davem@davemloft.net>
520 lines
15 KiB
C
520 lines
15 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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/* 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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/* 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)
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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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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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clc = (struct smc_clc_msg_accept_confirm *)clcm;
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if (ntohs(clc->hdr.length) != sizeof(*clc))
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return false;
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trl = &clc->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 (memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_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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if (!in_dev)
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return -ENODEV;
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for_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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} endfor_ifa(in_dev);
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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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if (!in_dev)
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return -ENODEV;
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for_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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} endfor_ifa(in_dev);
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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)
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{
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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;
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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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smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
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iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &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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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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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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(datlen > buflen) ||
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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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/* receive the complete CLC message */
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memset(&msg, 0, sizeof(struct msghdr));
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iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &vec, 1, datlen);
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krflags = MSG_WAITALL;
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smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
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len = sock_recvmsg(smc->clcsock, &msg, krflags);
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if (len < datlen || !smc_clc_msg_hdr_valid(clcm)) {
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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_DECLINE) {
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reason_code = SMC_CLC_DECL_REPLY;
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if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
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smc->conn.lgr->sync_err = true;
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smc_lgr_terminate(smc->conn.lgr);
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}
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}
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out:
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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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memcpy(dclc.id_for_peer, local_systemid, 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 < sizeof(struct smc_clc_msg_decline))
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smc->sk.sk_err = EPROTO;
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if (len < 0)
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smc->sk.sk_err = -len;
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return sock_error(&smc->sk);
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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,
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struct smc_ib_device *smcibdev,
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u8 ibport)
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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_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[4];
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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);
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if (rc)
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return SMC_CLC_DECL_CNFERR; /* configuration error */
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/* send SMC Proposal CLC message */
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plen = sizeof(pclc) + sizeof(pclc_prfx) +
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(pclc_prfx.ipv6_prefixes_cnt * sizeof(ipv6_prfx[0])) +
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sizeof(trl);
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memset(&pclc, 0, sizeof(pclc));
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memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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pclc.hdr.type = SMC_CLC_PROPOSAL;
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pclc.hdr.length = htons(plen);
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pclc.hdr.version = SMC_CLC_V1; /* SMC version */
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memcpy(pclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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memcpy(&pclc.lcl.gid, &smcibdev->gid[ibport - 1], SMC_GID_SIZE);
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memcpy(&pclc.lcl.mac, &smcibdev->mac[ibport - 1], ETH_ALEN);
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pclc.iparea_offset = htons(0);
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memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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i = 0;
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vec[i].iov_base = &pclc;
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vec[i++].iov_len = sizeof(pclc);
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vec[i].iov_base = &pclc_prfx;
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vec[i++].iov_len = sizeof(pclc_prfx);
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if (pclc_prfx.ipv6_prefixes_cnt > 0) {
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vec[i].iov_base = &ipv6_prfx[0];
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vec[i++].iov_len = pclc_prfx.ipv6_prefixes_cnt *
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sizeof(ipv6_prfx[0]);
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}
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vec[i].iov_base = &trl;
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vec[i++].iov_len = sizeof(trl);
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/* due to the few bytes needed for clc-handshake this cannot block */
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len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
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if (len < sizeof(pclc)) {
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if (len >= 0) {
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reason_code = -ENETUNREACH;
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smc->sk.sk_err = -reason_code;
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} else {
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smc->sk.sk_err = smc->clcsock->sk->sk_err;
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reason_code = -smc->sk.sk_err;
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}
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}
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return reason_code;
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}
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/* send CLC CONFIRM message across internal TCP socket */
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int smc_clc_send_confirm(struct smc_sock *smc)
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{
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struct smc_connection *conn = &smc->conn;
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struct smc_clc_msg_accept_confirm cclc;
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struct smc_link *link;
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int reason_code = 0;
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struct msghdr msg;
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struct kvec vec;
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int len;
|
|
|
|
link = &conn->lgr->lnk[SMC_SINGLE_LINK];
|
|
/* send SMC Confirm CLC msg */
|
|
memset(&cclc, 0, sizeof(cclc));
|
|
memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
cclc.hdr.type = SMC_CLC_CONFIRM;
|
|
cclc.hdr.length = htons(sizeof(cclc));
|
|
cclc.hdr.version = SMC_CLC_V1; /* SMC version */
|
|
memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
|
|
memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
|
|
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[SMC_SINGLE_LINK]->rkey);
|
|
cclc.conn_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[SMC_SINGLE_LINK].sgl));
|
|
hton24(cclc.psn, link->psn_initial);
|
|
|
|
memcpy(cclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
vec.iov_base = &cclc;
|
|
vec.iov_len = sizeof(cclc);
|
|
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(cclc));
|
|
if (len < sizeof(cclc)) {
|
|
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 rc = 0;
|
|
int len;
|
|
|
|
link = &conn->lgr->lnk[SMC_SINGLE_LINK];
|
|
memset(&aclc, 0, sizeof(aclc));
|
|
memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
aclc.hdr.type = SMC_CLC_ACCEPT;
|
|
aclc.hdr.length = htons(sizeof(aclc));
|
|
aclc.hdr.version = SMC_CLC_V1; /* SMC version */
|
|
if (srv_first_contact)
|
|
aclc.hdr.flag = 1;
|
|
memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
|
|
memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
|
|
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[SMC_SINGLE_LINK]->rkey);
|
|
aclc.conn_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[SMC_SINGLE_LINK].sgl));
|
|
hton24(aclc.psn, link->psn_initial);
|
|
memcpy(aclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
vec.iov_base = &aclc;
|
|
vec.iov_len = sizeof(aclc);
|
|
len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, sizeof(aclc));
|
|
if (len < sizeof(aclc)) {
|
|
if (len >= 0)
|
|
new_smc->sk.sk_err = EPROTO;
|
|
else
|
|
new_smc->sk.sk_err = new_smc->clcsock->sk->sk_err;
|
|
rc = sock_error(&new_smc->sk);
|
|
}
|
|
|
|
return rc;
|
|
}
|