554 lines
15 KiB
C
554 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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* Link Layer Control (LLC)
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
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* Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <net/tcp.h>
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#include <rdma/ib_verbs.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_llc.h"
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#define SMC_LLC_DATA_LEN 40
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struct smc_llc_hdr {
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struct smc_wr_rx_hdr common;
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u8 length; /* 44 */
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 reserved:4,
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add_link_rej_rsn:4;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 add_link_rej_rsn:4,
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reserved:4;
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#endif
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u8 flags;
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};
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#define SMC_LLC_FLAG_NO_RMBE_EYEC 0x03
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struct smc_llc_msg_confirm_link { /* type 0x01 */
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struct smc_llc_hdr hd;
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u8 sender_mac[ETH_ALEN];
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u8 sender_gid[SMC_GID_SIZE];
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u8 sender_qp_num[3];
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u8 link_num;
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u8 link_uid[SMC_LGR_ID_SIZE];
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u8 max_links;
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u8 reserved[9];
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};
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#define SMC_LLC_FLAG_ADD_LNK_REJ 0x40
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#define SMC_LLC_REJ_RSN_NO_ALT_PATH 1
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#define SMC_LLC_ADD_LNK_MAX_LINKS 2
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struct smc_llc_msg_add_link { /* type 0x02 */
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struct smc_llc_hdr hd;
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u8 sender_mac[ETH_ALEN];
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u8 reserved2[2];
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u8 sender_gid[SMC_GID_SIZE];
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u8 sender_qp_num[3];
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u8 link_num;
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u8 flags2; /* QP mtu */
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u8 initial_psn[3];
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u8 reserved[8];
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};
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#define SMC_LLC_FLAG_DEL_LINK_ALL 0x40
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#define SMC_LLC_FLAG_DEL_LINK_ORDERLY 0x20
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struct smc_llc_msg_del_link { /* type 0x04 */
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struct smc_llc_hdr hd;
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u8 link_num;
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__be32 reason;
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u8 reserved[35];
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} __packed; /* format defined in RFC7609 */
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struct smc_llc_msg_test_link { /* type 0x07 */
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struct smc_llc_hdr hd;
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u8 user_data[16];
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u8 reserved[24];
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};
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struct smc_rmb_rtoken {
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union {
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u8 num_rkeys; /* first rtoken byte of CONFIRM LINK msg */
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/* is actually the num of rtokens, first */
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/* rtoken is always for the current link */
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u8 link_id; /* link id of the rtoken */
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};
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__be32 rmb_key;
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__be64 rmb_vaddr;
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} __packed; /* format defined in RFC7609 */
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#define SMC_LLC_RKEYS_PER_MSG 3
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struct smc_llc_msg_confirm_rkey { /* type 0x06 */
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struct smc_llc_hdr hd;
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struct smc_rmb_rtoken rtoken[SMC_LLC_RKEYS_PER_MSG];
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u8 reserved;
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};
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struct smc_llc_msg_confirm_rkey_cont { /* type 0x08 */
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struct smc_llc_hdr hd;
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u8 num_rkeys;
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struct smc_rmb_rtoken rtoken[SMC_LLC_RKEYS_PER_MSG];
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};
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#define SMC_LLC_DEL_RKEY_MAX 8
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#define SMC_LLC_FLAG_RKEY_NEG 0x20
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struct smc_llc_msg_delete_rkey { /* type 0x09 */
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struct smc_llc_hdr hd;
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u8 num_rkeys;
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u8 err_mask;
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u8 reserved[2];
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__be32 rkey[8];
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u8 reserved2[4];
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};
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union smc_llc_msg {
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struct smc_llc_msg_confirm_link confirm_link;
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struct smc_llc_msg_add_link add_link;
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struct smc_llc_msg_del_link delete_link;
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struct smc_llc_msg_confirm_rkey confirm_rkey;
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struct smc_llc_msg_confirm_rkey_cont confirm_rkey_cont;
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struct smc_llc_msg_delete_rkey delete_rkey;
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struct smc_llc_msg_test_link test_link;
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struct {
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struct smc_llc_hdr hdr;
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u8 data[SMC_LLC_DATA_LEN];
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} raw;
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};
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#define SMC_LLC_FLAG_RESP 0x80
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/********************************** send *************************************/
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struct smc_llc_tx_pend {
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};
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/* handler for send/transmission completion of an LLC msg */
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static void smc_llc_tx_handler(struct smc_wr_tx_pend_priv *pend,
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struct smc_link *link,
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enum ib_wc_status wc_status)
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{
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/* future work: handle wc_status error for recovery and failover */
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}
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/**
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* smc_llc_add_pending_send() - add LLC control message to pending WQE transmits
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* @link: Pointer to SMC link used for sending LLC control message.
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* @wr_buf: Out variable returning pointer to work request payload buffer.
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* @pend: Out variable returning pointer to private pending WR tracking.
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* It's the context the transmit complete handler will get.
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*
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* Reserves and pre-fills an entry for a pending work request send/tx.
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* Used by mid-level smc_llc_send_msg() to prepare for later actual send/tx.
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* Can sleep due to smc_get_ctrl_buf (if not in softirq context).
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*
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* Return: 0 on success, otherwise an error value.
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*/
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static int smc_llc_add_pending_send(struct smc_link *link,
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struct smc_wr_buf **wr_buf,
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struct smc_wr_tx_pend_priv **pend)
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{
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int rc;
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rc = smc_wr_tx_get_free_slot(link, smc_llc_tx_handler, wr_buf, pend);
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if (rc < 0)
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return rc;
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BUILD_BUG_ON_MSG(
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sizeof(union smc_llc_msg) > SMC_WR_BUF_SIZE,
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"must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg)");
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BUILD_BUG_ON_MSG(
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sizeof(union smc_llc_msg) != SMC_WR_TX_SIZE,
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"must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send()");
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BUILD_BUG_ON_MSG(
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sizeof(struct smc_llc_tx_pend) > SMC_WR_TX_PEND_PRIV_SIZE,
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"must increase SMC_WR_TX_PEND_PRIV_SIZE to at least sizeof(struct smc_llc_tx_pend)");
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return 0;
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}
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/* high-level API to send LLC confirm link */
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int smc_llc_send_confirm_link(struct smc_link *link, u8 mac[],
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union ib_gid *gid,
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enum smc_llc_reqresp reqresp)
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{
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struct smc_link_group *lgr = container_of(link, struct smc_link_group,
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lnk[SMC_SINGLE_LINK]);
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struct smc_llc_msg_confirm_link *confllc;
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
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if (rc)
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return rc;
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confllc = (struct smc_llc_msg_confirm_link *)wr_buf;
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memset(confllc, 0, sizeof(*confllc));
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confllc->hd.common.type = SMC_LLC_CONFIRM_LINK;
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confllc->hd.length = sizeof(struct smc_llc_msg_confirm_link);
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confllc->hd.flags |= SMC_LLC_FLAG_NO_RMBE_EYEC;
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if (reqresp == SMC_LLC_RESP)
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confllc->hd.flags |= SMC_LLC_FLAG_RESP;
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memcpy(confllc->sender_mac, mac, ETH_ALEN);
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memcpy(confllc->sender_gid, gid, SMC_GID_SIZE);
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hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
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/* confllc->link_num = SMC_SINGLE_LINK; already done by memset above */
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memcpy(confllc->link_uid, lgr->id, SMC_LGR_ID_SIZE);
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confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS; /* enforce peer resp. */
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/* send llc message */
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rc = smc_wr_tx_send(link, pend);
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return rc;
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}
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/* send ADD LINK request or response */
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int smc_llc_send_add_link(struct smc_link *link, u8 mac[],
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union ib_gid *gid,
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enum smc_llc_reqresp reqresp)
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{
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struct smc_llc_msg_add_link *addllc;
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
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if (rc)
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return rc;
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addllc = (struct smc_llc_msg_add_link *)wr_buf;
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memset(addllc, 0, sizeof(*addllc));
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addllc->hd.common.type = SMC_LLC_ADD_LINK;
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addllc->hd.length = sizeof(struct smc_llc_msg_add_link);
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if (reqresp == SMC_LLC_RESP) {
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addllc->hd.flags |= SMC_LLC_FLAG_RESP;
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/* always reject more links for now */
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addllc->hd.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
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addllc->hd.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
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}
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memcpy(addllc->sender_mac, mac, ETH_ALEN);
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memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
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/* send llc message */
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rc = smc_wr_tx_send(link, pend);
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return rc;
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}
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/* send DELETE LINK request or response */
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int smc_llc_send_delete_link(struct smc_link *link,
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enum smc_llc_reqresp reqresp)
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{
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struct smc_llc_msg_del_link *delllc;
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
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if (rc)
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return rc;
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delllc = (struct smc_llc_msg_del_link *)wr_buf;
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memset(delllc, 0, sizeof(*delllc));
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delllc->hd.common.type = SMC_LLC_DELETE_LINK;
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delllc->hd.length = sizeof(struct smc_llc_msg_add_link);
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if (reqresp == SMC_LLC_RESP)
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delllc->hd.flags |= SMC_LLC_FLAG_RESP;
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/* DEL_LINK_ALL because only 1 link supported */
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delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
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delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
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delllc->link_num = link->link_id;
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/* send llc message */
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rc = smc_wr_tx_send(link, pend);
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return rc;
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}
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/* send LLC test link request or response */
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int smc_llc_send_test_link(struct smc_link *link, u8 user_data[16],
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enum smc_llc_reqresp reqresp)
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{
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struct smc_llc_msg_test_link *testllc;
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
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if (rc)
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return rc;
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testllc = (struct smc_llc_msg_test_link *)wr_buf;
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memset(testllc, 0, sizeof(*testllc));
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testllc->hd.common.type = SMC_LLC_TEST_LINK;
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testllc->hd.length = sizeof(struct smc_llc_msg_test_link);
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if (reqresp == SMC_LLC_RESP)
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testllc->hd.flags |= SMC_LLC_FLAG_RESP;
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memcpy(testllc->user_data, user_data, sizeof(testllc->user_data));
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/* send llc message */
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rc = smc_wr_tx_send(link, pend);
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return rc;
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}
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/* send a prepared message */
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static int smc_llc_send_message(struct smc_link *link, void *llcbuf, int llclen)
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{
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struct smc_wr_tx_pend_priv *pend;
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struct smc_wr_buf *wr_buf;
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int rc;
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rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
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if (rc)
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return rc;
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memcpy(wr_buf, llcbuf, llclen);
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/* send llc message */
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rc = smc_wr_tx_send(link, pend);
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return rc;
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}
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/********************************* receive ***********************************/
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static void smc_llc_rx_confirm_link(struct smc_link *link,
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struct smc_llc_msg_confirm_link *llc)
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{
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struct smc_link_group *lgr;
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int conf_rc;
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lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
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/* RMBE eyecatchers are not supported */
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if (llc->hd.flags & SMC_LLC_FLAG_NO_RMBE_EYEC)
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conf_rc = 0;
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else
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conf_rc = ENOTSUPP;
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if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
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if (lgr->role == SMC_SERV &&
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link->state == SMC_LNK_ACTIVATING) {
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link->llc_confirm_resp_rc = conf_rc;
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complete(&link->llc_confirm_resp);
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}
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} else {
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if (lgr->role == SMC_CLNT &&
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link->state == SMC_LNK_ACTIVATING) {
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link->llc_confirm_rc = conf_rc;
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link->link_id = llc->link_num;
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complete(&link->llc_confirm);
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}
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}
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}
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static void smc_llc_rx_add_link(struct smc_link *link,
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struct smc_llc_msg_add_link *llc)
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{
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struct smc_link_group *lgr = container_of(link, struct smc_link_group,
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lnk[SMC_SINGLE_LINK]);
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if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
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if (link->state == SMC_LNK_ACTIVATING)
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complete(&link->llc_add_resp);
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} else {
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if (link->state == SMC_LNK_ACTIVATING) {
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complete(&link->llc_add);
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return;
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}
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if (lgr->role == SMC_SERV) {
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smc_llc_send_add_link(link,
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link->smcibdev->mac[link->ibport - 1],
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&link->smcibdev->gid[link->ibport - 1],
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SMC_LLC_REQ);
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} else {
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smc_llc_send_add_link(link,
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link->smcibdev->mac[link->ibport - 1],
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&link->smcibdev->gid[link->ibport - 1],
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SMC_LLC_RESP);
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}
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}
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}
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static void smc_llc_rx_delete_link(struct smc_link *link,
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struct smc_llc_msg_del_link *llc)
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{
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struct smc_link_group *lgr = container_of(link, struct smc_link_group,
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lnk[SMC_SINGLE_LINK]);
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if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
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if (lgr->role == SMC_SERV)
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smc_lgr_terminate(lgr);
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} else {
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if (lgr->role == SMC_SERV) {
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smc_lgr_forget(lgr);
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smc_llc_send_delete_link(link, SMC_LLC_REQ);
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} else {
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smc_llc_send_delete_link(link, SMC_LLC_RESP);
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smc_lgr_terminate(lgr);
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}
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}
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}
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static void smc_llc_rx_test_link(struct smc_link *link,
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struct smc_llc_msg_test_link *llc)
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{
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if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
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/* unused as long as we don't send this type of msg */
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} else {
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smc_llc_send_test_link(link, llc->user_data, SMC_LLC_RESP);
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}
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}
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static void smc_llc_rx_confirm_rkey(struct smc_link *link,
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struct smc_llc_msg_confirm_rkey *llc)
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{
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struct smc_link_group *lgr;
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int rc;
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lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
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if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
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/* unused as long as we don't send this type of msg */
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} else {
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rc = smc_rtoken_add(lgr,
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llc->rtoken[0].rmb_vaddr,
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llc->rtoken[0].rmb_key);
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/* ignore rtokens for other links, we have only one link */
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llc->hd.flags |= SMC_LLC_FLAG_RESP;
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if (rc < 0)
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llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
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smc_llc_send_message(link, (void *)llc, sizeof(*llc));
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}
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}
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static void smc_llc_rx_confirm_rkey_cont(struct smc_link *link,
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struct smc_llc_msg_confirm_rkey_cont *llc)
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{
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if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
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/* unused as long as we don't send this type of msg */
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} else {
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/* ignore rtokens for other links, we have only one link */
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llc->hd.flags |= SMC_LLC_FLAG_RESP;
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smc_llc_send_message(link, (void *)llc, sizeof(*llc));
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}
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}
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static void smc_llc_rx_delete_rkey(struct smc_link *link,
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struct smc_llc_msg_delete_rkey *llc)
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{
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struct smc_link_group *lgr;
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u8 err_mask = 0;
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int i, max;
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lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
|
|
|
|
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
|
|
/* unused as long as we don't send this type of msg */
|
|
} else {
|
|
max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
|
|
for (i = 0; i < max; i++) {
|
|
if (smc_rtoken_delete(lgr, llc->rkey[i]))
|
|
err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i);
|
|
}
|
|
|
|
if (err_mask) {
|
|
llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
|
|
llc->err_mask = err_mask;
|
|
}
|
|
|
|
llc->hd.flags |= SMC_LLC_FLAG_RESP;
|
|
smc_llc_send_message(link, (void *)llc, sizeof(*llc));
|
|
}
|
|
}
|
|
|
|
static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
|
|
{
|
|
struct smc_link *link = (struct smc_link *)wc->qp->qp_context;
|
|
union smc_llc_msg *llc = buf;
|
|
|
|
if (wc->byte_len < sizeof(*llc))
|
|
return; /* short message */
|
|
if (llc->raw.hdr.length != sizeof(*llc))
|
|
return; /* invalid message */
|
|
|
|
switch (llc->raw.hdr.common.type) {
|
|
case SMC_LLC_TEST_LINK:
|
|
smc_llc_rx_test_link(link, &llc->test_link);
|
|
break;
|
|
case SMC_LLC_CONFIRM_LINK:
|
|
smc_llc_rx_confirm_link(link, &llc->confirm_link);
|
|
break;
|
|
case SMC_LLC_ADD_LINK:
|
|
smc_llc_rx_add_link(link, &llc->add_link);
|
|
break;
|
|
case SMC_LLC_DELETE_LINK:
|
|
smc_llc_rx_delete_link(link, &llc->delete_link);
|
|
break;
|
|
case SMC_LLC_CONFIRM_RKEY:
|
|
smc_llc_rx_confirm_rkey(link, &llc->confirm_rkey);
|
|
break;
|
|
case SMC_LLC_CONFIRM_RKEY_CONT:
|
|
smc_llc_rx_confirm_rkey_cont(link, &llc->confirm_rkey_cont);
|
|
break;
|
|
case SMC_LLC_DELETE_RKEY:
|
|
smc_llc_rx_delete_rkey(link, &llc->delete_rkey);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/***************************** init, exit, misc ******************************/
|
|
|
|
static struct smc_wr_rx_handler smc_llc_rx_handlers[] = {
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_CONFIRM_LINK
|
|
},
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_TEST_LINK
|
|
},
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_ADD_LINK
|
|
},
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_DELETE_LINK
|
|
},
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_CONFIRM_RKEY
|
|
},
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_CONFIRM_RKEY_CONT
|
|
},
|
|
{
|
|
.handler = smc_llc_rx_handler,
|
|
.type = SMC_LLC_DELETE_RKEY
|
|
},
|
|
{
|
|
.handler = NULL,
|
|
}
|
|
};
|
|
|
|
int __init smc_llc_init(void)
|
|
{
|
|
struct smc_wr_rx_handler *handler;
|
|
int rc = 0;
|
|
|
|
for (handler = smc_llc_rx_handlers; handler->handler; handler++) {
|
|
INIT_HLIST_NODE(&handler->list);
|
|
rc = smc_wr_rx_register_handler(handler);
|
|
if (rc)
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|