![Linus Torvalds](/assets/img/avatar_default.png)
Pull networking updates from David Miller: 1) Significantly shrink the core networking routing structures. Result of http://vger.kernel.org/~davem/seoul2017_netdev_keynote.pdf 2) Add netdevsim driver for testing various offloads, from Jakub Kicinski. 3) Support cross-chip FDB operations in DSA, from Vivien Didelot. 4) Add a 2nd listener hash table for TCP, similar to what was done for UDP. From Martin KaFai Lau. 5) Add eBPF based queue selection to tun, from Jason Wang. 6) Lockless qdisc support, from John Fastabend. 7) SCTP stream interleave support, from Xin Long. 8) Smoother TCP receive autotuning, from Eric Dumazet. 9) Lots of erspan tunneling enhancements, from William Tu. 10) Add true function call support to BPF, from Alexei Starovoitov. 11) Add explicit support for GRO HW offloading, from Michael Chan. 12) Support extack generation in more netlink subsystems. From Alexander Aring, Quentin Monnet, and Jakub Kicinski. 13) Add 1000BaseX, flow control, and EEE support to mvneta driver. From Russell King. 14) Add flow table abstraction to netfilter, from Pablo Neira Ayuso. 15) Many improvements and simplifications to the NFP driver bpf JIT, from Jakub Kicinski. 16) Support for ipv6 non-equal cost multipath routing, from Ido Schimmel. 17) Add resource abstration to devlink, from Arkadi Sharshevsky. 18) Packet scheduler classifier shared filter block support, from Jiri Pirko. 19) Avoid locking in act_csum, from Davide Caratti. 20) devinet_ioctl() simplifications from Al viro. 21) More TCP bpf improvements from Lawrence Brakmo. 22) Add support for onlink ipv6 route flag, similar to ipv4, from David Ahern. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1925 commits) tls: Add support for encryption using async offload accelerator ip6mr: fix stale iterator net/sched: kconfig: Remove blank help texts openvswitch: meter: Use 64-bit arithmetic instead of 32-bit tcp_nv: fix potential integer overflow in tcpnv_acked r8169: fix RTL8168EP take too long to complete driver initialization. qmi_wwan: Add support for Quectel EP06 rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK ipmr: Fix ptrdiff_t print formatting ibmvnic: Wait for device response when changing MAC qlcnic: fix deadlock bug tcp: release sk_frag.page in tcp_disconnect ipv4: Get the address of interface correctly. net_sched: gen_estimator: fix lockdep splat net: macb: Handle HRESP error net/mlx5e: IPoIB, Fix copy-paste bug in flow steering refactoring ipv6: addrconf: break critical section in addrconf_verify_rtnl() ipv6: change route cache aging logic i40e/i40evf: Update DESC_NEEDED value to reflect larger value bnxt_en: cleanup DIM work on device shutdown ...
342 lines
10 KiB
C
342 lines
10 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
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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/if_ether.h>
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#include <linux/sched/signal.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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/* 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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/* 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, buflen);
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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_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 reason_code = 0;
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struct kvec vec[3];
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struct msghdr msg;
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int len, plen, rc;
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/* send SMC Proposal CLC message */
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plen = sizeof(pclc) + sizeof(pclc_prfx) + 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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memset(&pclc_prfx, 0, sizeof(pclc_prfx));
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/* determine subnet and mask from internal TCP socket */
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rc = smc_netinfo_by_tcpsk(smc->clcsock, &pclc_prfx.outgoing_subnet,
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&pclc_prfx.prefix_len);
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if (rc)
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return SMC_CLC_DECL_CNFERR; /* configuration error */
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pclc_prfx.ipv6_prefixes_cnt = 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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vec[0].iov_base = &pclc;
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vec[0].iov_len = sizeof(pclc);
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vec[1].iov_base = &pclc_prfx;
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vec[1].iov_len = sizeof(pclc_prfx);
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vec[2].iov_base = &trl;
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vec[2].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, 3, 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;
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link = &conn->lgr->lnk[SMC_SINGLE_LINK];
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/* send SMC Confirm CLC msg */
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memset(&cclc, 0, sizeof(cclc));
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memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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cclc.hdr.type = SMC_CLC_CONFIRM;
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cclc.hdr.length = htons(sizeof(cclc));
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cclc.hdr.version = SMC_CLC_V1; /* SMC version */
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memcpy(cclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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memcpy(&cclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
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SMC_GID_SIZE);
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memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
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hton24(cclc.qpn, link->roce_qp->qp_num);
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cclc.rmb_rkey =
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htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
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cclc.conn_idx = 1; /* for now: 1 RMB = 1 RMBE */
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cclc.rmbe_alert_token = htonl(conn->alert_token_local);
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cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
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cclc.rmbe_size = conn->rmbe_size_short;
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cclc.rmb_dma_addr = cpu_to_be64(
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(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
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hton24(cclc.psn, link->psn_initial);
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memcpy(cclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &cclc;
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vec.iov_len = sizeof(cclc);
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len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, sizeof(cclc));
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if (len < sizeof(cclc)) {
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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 ACCEPT message across internal TCP socket */
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int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
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{
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struct smc_connection *conn = &new_smc->conn;
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struct smc_clc_msg_accept_confirm aclc;
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struct smc_link *link;
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struct msghdr msg;
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struct kvec vec;
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int rc = 0;
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int len;
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link = &conn->lgr->lnk[SMC_SINGLE_LINK];
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memset(&aclc, 0, sizeof(aclc));
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memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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aclc.hdr.type = SMC_CLC_ACCEPT;
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aclc.hdr.length = htons(sizeof(aclc));
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aclc.hdr.version = SMC_CLC_V1; /* SMC version */
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if (srv_first_contact)
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aclc.hdr.flag = 1;
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memcpy(aclc.lcl.id_for_peer, local_systemid, sizeof(local_systemid));
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memcpy(&aclc.lcl.gid, &link->smcibdev->gid[link->ibport - 1],
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SMC_GID_SIZE);
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memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1], ETH_ALEN);
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hton24(aclc.qpn, link->roce_qp->qp_num);
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aclc.rmb_rkey =
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htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
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aclc.conn_idx = 1; /* as long as 1 RMB = 1 RMBE */
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aclc.rmbe_alert_token = htonl(conn->alert_token_local);
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aclc.qp_mtu = link->path_mtu;
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aclc.rmbe_size = conn->rmbe_size_short,
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aclc.rmb_dma_addr = cpu_to_be64(
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(u64)sg_dma_address(conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
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hton24(aclc.psn, link->psn_initial);
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memcpy(aclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &aclc;
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vec.iov_len = sizeof(aclc);
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len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, sizeof(aclc));
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if (len < sizeof(aclc)) {
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if (len >= 0)
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new_smc->sk.sk_err = EPROTO;
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else
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new_smc->sk.sk_err = new_smc->clcsock->sk->sk_err;
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rc = sock_error(&new_smc->sk);
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}
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return rc;
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}
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