07159830be
AIO write requests for a TOE socket on a Chelsio T4+ adapter can now DMA directly from the user-supplied buffer. This is implemented by wiring the pages backing the user-supplied buffer and queueing special mbufs backed by raw VM pages to the socket buffer. The TOE code recognizes these special mbufs and builds a sglist from the VM page array associated with the mbuf when queueing a work request to the TOE. Because these mbufs do not have an associated virtual address, m_data is not valid. Thus, the AIO handler does not invoke sosend() directly for these mbufs but instead inlines portions of sosend_generic() and tcp_usr_send(). An aiotx_buffer structure is used to describe the user buffer (e.g. it holds the array of VM pages and a reference to the AIO job). The special mbufs reference this structure via m_ext. Note that a single job might be split across multiple mbufs (e.g. if it is larger than the socket buffer size). The 'ext_arg2' member of each mbuf gives an offset relative to the backing aiotx_buffer. The AIO job associated with an aiotx_buffer structure is completed when the last reference to the structure is released. Zero-copy aio_write()'s for connections associated with a given adapter can be enabled/disabled at runtime via the 'dev.t[45]nex.N.toe.tx_zcopy' sysctl. MFC after: 1 month Relnotes: yes Sponsored by: Chelsio Communications
366 lines
12 KiB
C
366 lines
12 KiB
C
/*-
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* Copyright (c) 2012, 2015 Chelsio Communications, Inc.
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* All rights reserved.
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* Written by: Navdeep Parhar <np@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef __T4_TOM_H__
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#define __T4_TOM_H__
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#include <sys/vmem.h>
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#define LISTEN_HASH_SIZE 32
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/*
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* Min receive window. We want it to be large enough to accommodate receive
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* coalescing, handle jumbo frames, and not trigger sender SWS avoidance.
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*/
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#define MIN_RCV_WND (24 * 1024U)
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/*
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* Max receive window supported by HW in bytes. Only a small part of it can
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* be set through option0, the rest needs to be set through RX_DATA_ACK.
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*/
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#define MAX_RCV_WND ((1U << 27) - 1)
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#define DDP_RSVD_WIN (16 * 1024U)
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#define SB_DDP_INDICATE SB_IN_TOE /* soreceive must respond to indicate */
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#define USE_DDP_RX_FLOW_CONTROL
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/* TOE PCB flags */
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enum {
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TPF_ATTACHED = (1 << 0), /* a tcpcb refers to this toepcb */
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TPF_FLOWC_WR_SENT = (1 << 1), /* firmware flow context WR sent */
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TPF_TX_DATA_SENT = (1 << 2), /* some data sent */
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TPF_TX_SUSPENDED = (1 << 3), /* tx suspended for lack of resources */
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TPF_SEND_FIN = (1 << 4), /* send FIN after all pending data */
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TPF_FIN_SENT = (1 << 5), /* FIN has been sent */
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TPF_ABORT_SHUTDOWN = (1 << 6), /* connection abort is in progress */
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TPF_CPL_PENDING = (1 << 7), /* haven't received the last CPL */
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TPF_SYNQE = (1 << 8), /* synq_entry, not really a toepcb */
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TPF_SYNQE_NEEDFREE = (1 << 9), /* synq_entry was malloc'd separately */
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TPF_SYNQE_TCPDDP = (1 << 10), /* ulp_mode TCPDDP in toepcb */
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TPF_SYNQE_EXPANDED = (1 << 11), /* toepcb ready, tid context updated */
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TPF_SYNQE_HAS_L2TE = (1 << 12), /* we've replied to PASS_ACCEPT_REQ */
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};
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enum {
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DDP_OK = (1 << 0), /* OK to turn on DDP */
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DDP_SC_REQ = (1 << 1), /* state change (on/off) requested */
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DDP_ON = (1 << 2), /* DDP is turned on */
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DDP_BUF0_ACTIVE = (1 << 3), /* buffer 0 in use (not invalidated) */
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DDP_BUF1_ACTIVE = (1 << 4), /* buffer 1 in use (not invalidated) */
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DDP_TASK_ACTIVE = (1 << 5), /* requeue task is queued / running */
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DDP_DEAD = (1 << 6), /* toepcb is shutting down */
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};
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struct ofld_tx_sdesc {
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uint32_t plen; /* payload length */
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uint8_t tx_credits; /* firmware tx credits (unit is 16B) */
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};
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struct pageset {
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TAILQ_ENTRY(pageset) link;
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vm_page_t *pages;
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int npages;
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int flags;
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u_int ppod_addr;
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int nppods;
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uint32_t tag; /* includes color, page pod addr, and DDP page size */
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int offset; /* offset in first page */
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int len;
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struct vmspace *vm;
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u_int vm_timestamp;
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};
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TAILQ_HEAD(pagesetq, pageset);
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#define PS_WIRED 0x0001 /* Pages wired rather than held. */
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#define PS_PPODS_WRITTEN 0x0002 /* Page pods written to the card. */
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#define EXT_FLAG_AIOTX EXT_FLAG_VENDOR1
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struct ddp_buffer {
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struct pageset *ps;
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struct kaiocb *job;
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int cancel_pending;
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};
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struct aiotx_buffer {
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struct pageset ps;
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struct kaiocb *job;
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int refcount;
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};
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struct toepcb {
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TAILQ_ENTRY(toepcb) link; /* toep_list */
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u_int flags; /* miscellaneous flags */
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int refcount;
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struct tom_data *td;
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struct inpcb *inp; /* backpointer to host stack's PCB */
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struct vi_info *vi; /* virtual interface */
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struct sge_wrq *ofld_txq;
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struct sge_ofld_rxq *ofld_rxq;
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struct sge_wrq *ctrlq;
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struct l2t_entry *l2te; /* L2 table entry used by this connection */
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struct clip_entry *ce; /* CLIP table entry used by this tid */
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int tid; /* Connection identifier */
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/* tx credit handling */
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u_int tx_total; /* total tx WR credits (in 16B units) */
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u_int tx_credits; /* tx WR credits (in 16B units) available */
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u_int tx_nocompl; /* tx WR credits since last compl request */
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u_int plen_nocompl; /* payload since last compl request */
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/* rx credit handling */
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u_int sb_cc; /* last noted value of so_rcv->sb_cc */
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int rx_credits; /* rx credits (in bytes) to be returned to hw */
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u_int ulp_mode; /* ULP mode */
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void *ulpcb;
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void *ulpcb2;
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struct mbufq ulp_pduq; /* PDUs waiting to be sent out. */
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struct mbufq ulp_pdu_reclaimq;
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u_int ddp_flags;
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struct ddp_buffer db[2];
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TAILQ_HEAD(, pageset) ddp_cached_pagesets;
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TAILQ_HEAD(, kaiocb) ddp_aiojobq;
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u_int ddp_waiting_count;
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u_int ddp_active_count;
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u_int ddp_cached_count;
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int ddp_active_id; /* the currently active DDP buffer */
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struct task ddp_requeue_task;
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struct kaiocb *ddp_queueing;
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struct mtx ddp_lock;
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TAILQ_HEAD(, kaiocb) aiotx_jobq;
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struct task aiotx_task;
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bool aiotx_task_active;
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/* Tx software descriptor */
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uint8_t txsd_total;
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uint8_t txsd_pidx;
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uint8_t txsd_cidx;
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uint8_t txsd_avail;
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struct ofld_tx_sdesc txsd[];
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};
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#define DDP_LOCK(toep) mtx_lock(&(toep)->ddp_lock)
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#define DDP_UNLOCK(toep) mtx_unlock(&(toep)->ddp_lock)
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#define DDP_ASSERT_LOCKED(toep) mtx_assert(&(toep)->ddp_lock, MA_OWNED)
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struct flowc_tx_params {
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uint32_t snd_nxt;
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uint32_t rcv_nxt;
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unsigned int snd_space;
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unsigned int mss;
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};
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#define DDP_RETRY_WAIT 5 /* seconds to wait before re-enabling DDP */
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#define DDP_LOW_SCORE 1
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#define DDP_HIGH_SCORE 3
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/*
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* Compressed state for embryonic connections for a listener. Barely fits in
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* 64B, try not to grow it further.
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*/
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struct synq_entry {
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TAILQ_ENTRY(synq_entry) link; /* listen_ctx's synq link */
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int flags; /* same as toepcb's tp_flags */
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int tid;
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struct listen_ctx *lctx; /* backpointer to listen ctx */
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struct mbuf *syn;
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uint32_t iss;
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uint32_t ts;
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volatile uintptr_t wr;
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volatile u_int refcnt;
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uint16_t l2e_idx;
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uint16_t rcv_bufsize;
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};
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/* listen_ctx flags */
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#define LCTX_RPL_PENDING 1 /* waiting for a CPL_PASS_OPEN_RPL */
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struct listen_ctx {
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LIST_ENTRY(listen_ctx) link; /* listen hash linkage */
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volatile int refcount;
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int stid;
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struct stid_region stid_region;
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int flags;
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struct inpcb *inp; /* listening socket's inp */
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struct sge_wrq *ctrlq;
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struct sge_ofld_rxq *ofld_rxq;
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struct clip_entry *ce;
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TAILQ_HEAD(, synq_entry) synq;
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};
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struct clip_entry {
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TAILQ_ENTRY(clip_entry) link;
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struct in6_addr lip; /* local IPv6 address */
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u_int refcount;
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};
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TAILQ_HEAD(clip_head, clip_entry);
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struct tom_data {
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struct toedev tod;
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/* toepcb's associated with this TOE device */
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struct mtx toep_list_lock;
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TAILQ_HEAD(, toepcb) toep_list;
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struct mtx lctx_hash_lock;
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LIST_HEAD(, listen_ctx) *listen_hash;
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u_long listen_mask;
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int lctx_count; /* # of lctx in the hash table */
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u_int ppod_start;
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vmem_t *ppod_arena;
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struct mtx clip_table_lock;
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struct clip_head clip_table;
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int clip_gen;
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/* WRs that will not be sent to the chip because L2 resolution failed */
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struct mtx unsent_wr_lock;
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STAILQ_HEAD(, wrqe) unsent_wr_list;
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struct task reclaim_wr_resources;
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};
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static inline struct tom_data *
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tod_td(struct toedev *tod)
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{
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return (__containerof(tod, struct tom_data, tod));
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}
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static inline struct adapter *
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td_adapter(struct tom_data *td)
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{
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return (td->tod.tod_softc);
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}
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static inline void
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set_mbuf_ulp_submode(struct mbuf *m, uint8_t ulp_submode)
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{
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M_ASSERTPKTHDR(m);
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m->m_pkthdr.PH_per.eight[0] = ulp_submode;
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}
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static inline uint8_t
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mbuf_ulp_submode(struct mbuf *m)
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{
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M_ASSERTPKTHDR(m);
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return (m->m_pkthdr.PH_per.eight[0]);
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}
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/* t4_tom.c */
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struct toepcb *alloc_toepcb(struct vi_info *, int, int, int);
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struct toepcb *hold_toepcb(struct toepcb *);
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void free_toepcb(struct toepcb *);
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void offload_socket(struct socket *, struct toepcb *);
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void undo_offload_socket(struct socket *);
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void final_cpl_received(struct toepcb *);
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void insert_tid(struct adapter *, int, void *);
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void *lookup_tid(struct adapter *, int);
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void update_tid(struct adapter *, int, void *);
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void remove_tid(struct adapter *, int);
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void release_tid(struct adapter *, int, struct sge_wrq *);
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int find_best_mtu_idx(struct adapter *, struct in_conninfo *, int);
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u_long select_rcv_wnd(struct socket *);
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int select_rcv_wscale(void);
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uint64_t calc_opt0(struct socket *, struct vi_info *, struct l2t_entry *,
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int, int, int, int);
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uint64_t select_ntuple(struct vi_info *, struct l2t_entry *);
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void set_tcpddp_ulp_mode(struct toepcb *);
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int negative_advice(int);
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struct clip_entry *hold_lip(struct tom_data *, struct in6_addr *);
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void release_lip(struct tom_data *, struct clip_entry *);
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/* t4_connect.c */
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void t4_init_connect_cpl_handlers(void);
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int t4_connect(struct toedev *, struct socket *, struct rtentry *,
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struct sockaddr *);
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void act_open_failure_cleanup(struct adapter *, u_int, u_int);
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/* t4_listen.c */
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void t4_init_listen_cpl_handlers(void);
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int t4_listen_start(struct toedev *, struct tcpcb *);
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int t4_listen_stop(struct toedev *, struct tcpcb *);
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void t4_syncache_added(struct toedev *, void *);
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void t4_syncache_removed(struct toedev *, void *);
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int t4_syncache_respond(struct toedev *, void *, struct mbuf *);
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int do_abort_req_synqe(struct sge_iq *, const struct rss_header *,
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struct mbuf *);
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int do_abort_rpl_synqe(struct sge_iq *, const struct rss_header *,
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struct mbuf *);
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void t4_offload_socket(struct toedev *, void *, struct socket *);
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/* t4_cpl_io.c */
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void aiotx_init_toep(struct toepcb *);
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int t4_aio_queue_aiotx(struct socket *, struct kaiocb *);
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void t4_init_cpl_io_handlers(void);
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void t4_uninit_cpl_io_handlers(void);
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void send_abort_rpl(struct adapter *, struct sge_wrq *, int , int);
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void send_flowc_wr(struct toepcb *, struct flowc_tx_params *);
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void send_reset(struct adapter *, struct toepcb *, uint32_t);
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void make_established(struct toepcb *, uint32_t, uint32_t, uint16_t);
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void t4_rcvd(struct toedev *, struct tcpcb *);
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void t4_rcvd_locked(struct toedev *, struct tcpcb *);
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int t4_tod_output(struct toedev *, struct tcpcb *);
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int t4_send_fin(struct toedev *, struct tcpcb *);
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int t4_send_rst(struct toedev *, struct tcpcb *);
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void t4_set_tcb_field(struct adapter *, struct sge_wrq *, int, uint16_t,
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uint64_t, uint64_t, int, int, int);
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void t4_push_frames(struct adapter *sc, struct toepcb *toep, int drop);
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void t4_push_pdus(struct adapter *sc, struct toepcb *toep, int drop);
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int do_set_tcb_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *);
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/* t4_ddp.c */
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void t4_init_ddp(struct adapter *, struct tom_data *);
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void t4_uninit_ddp(struct adapter *, struct tom_data *);
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int t4_soreceive_ddp(struct socket *, struct sockaddr **, struct uio *,
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struct mbuf **, struct mbuf **, int *);
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int t4_aio_queue_ddp(struct socket *, struct kaiocb *);
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int t4_ddp_mod_load(void);
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void t4_ddp_mod_unload(void);
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void ddp_assert_empty(struct toepcb *);
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void ddp_init_toep(struct toepcb *);
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void ddp_uninit_toep(struct toepcb *);
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void ddp_queue_toep(struct toepcb *);
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void release_ddp_resources(struct toepcb *toep);
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void handle_ddp_close(struct toepcb *, struct tcpcb *, uint32_t);
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void handle_ddp_indicate(struct toepcb *);
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void handle_ddp_tcb_rpl(struct toepcb *, const struct cpl_set_tcb_rpl *);
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void insert_ddp_data(struct toepcb *, uint32_t);
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#endif
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