- Updated TOE support in the kernel.

- Stateful TCP offload drivers for Terminator 3 and 4 (T3 and T4) ASICs.
  These are available as t3_tom and t4_tom modules that augment cxgb(4)
  and cxgbe(4) respectively.  The cxgb/cxgbe drivers continue to work as
  usual with or without these extra features.

- iWARP driver for Terminator 3 ASIC (kernel verbs).  T4 iWARP in the
  works and will follow soon.

Build-tested with make universe.

30s overview
============
What interfaces support TCP offload?  Look for TOE4 and/or TOE6 in the
capabilities of an interface:
# ifconfig -m | grep TOE

Enable/disable TCP offload on an interface (just like any other ifnet
capability):
# ifconfig cxgbe0 toe
# ifconfig cxgbe0 -toe

Which connections are offloaded?  Look for toe4 and/or toe6 in the
output of netstat and sockstat:
# netstat -np tcp | grep toe
# sockstat -46c | grep toe

Reviewed by:	bz, gnn
Sponsored by:	Chelsio communications.
MFC after:	~3 months (after 9.1, and after ensuring MFC is feasible)

1 files changed, 377 insertions, 0 deletions

diff --git a/sys/dev/cxgbe/tom/t4_connect.c b/sys/dev/cxgbe/tom/t4_connect.c
new file mode 100644
index 000000000000..bc591716aeab
--- /dev/null
+++ b/sys/dev/cxgbe/tom/t4_connect.c
@@ -0,0 +1,377 @@
+/*-
+ * Copyright (c) 2012 Chelsio Communications, Inc.
+ * All rights reserved.
+ * Written by: Navdeep Parhar <np@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_inet.h"
+
+#ifdef TCP_OFFLOAD
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/kernel.h>
+#include <sys/ktr.h>
+#include <sys/module.h>
+#include <sys/protosw.h>
+#include <sys/domain.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/if_vlan_var.h>
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_pcb.h>
+#include <netinet/ip.h>
+#include <netinet/tcp_var.h>
+#define TCPSTATES
+#include <netinet/tcp_fsm.h>
+#include <netinet/toecore.h>
+
+#include "common/common.h"
+#include "common/t4_msg.h"
+#include "common/t4_regs.h"
+#include "tom/t4_tom_l2t.h"
+#include "tom/t4_tom.h"
+
+/* atid services */
+static int alloc_atid(struct adapter *, void *);
+static void *lookup_atid(struct adapter *, int);
+static void free_atid(struct adapter *, int);
+
+static int
+alloc_atid(struct adapter *sc, void *ctx)
+{
+	struct tid_info *t = &sc->tids;
+	int atid = -1;
+
+	mtx_lock(&t->atid_lock);
+	if (t->afree) {
+		union aopen_entry *p = t->afree;
+
+		atid = p - t->atid_tab;
+		t->afree = p->next;
+		p->data = ctx;
+		t->atids_in_use++;
+	}
+	mtx_unlock(&t->atid_lock);
+	return (atid);
+}
+
+static void *
+lookup_atid(struct adapter *sc, int atid)
+{
+	struct tid_info *t = &sc->tids;
+
+	return (t->atid_tab[atid].data);
+}
+
+static void
+free_atid(struct adapter *sc, int atid)
+{
+	struct tid_info *t = &sc->tids;
+	union aopen_entry *p = &t->atid_tab[atid];
+
+	mtx_lock(&t->atid_lock);
+	p->next = t->afree;
+	t->afree = p;
+	t->atids_in_use--;
+	mtx_unlock(&t->atid_lock);
+}
+
+/*
+ * Active open failed.
+ */
+static int
+do_act_establish(struct sge_iq *iq, const struct rss_header *rss,
+    struct mbuf *m)
+{
+	struct adapter *sc = iq->adapter;
+	const struct cpl_act_establish *cpl = (const void *)(rss + 1);
+	unsigned int tid = GET_TID(cpl);
+	unsigned int atid = G_TID_TID(ntohl(cpl->tos_atid));
+	struct toepcb *toep = lookup_atid(sc, atid);
+	struct inpcb *inp = toep->inp;
+
+	KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
+	KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
+
+	CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid);
+	free_atid(sc, atid);
+
+	INP_WLOCK(inp);
+	toep->tid = tid;
+	insert_tid(sc, tid, toep);
+	if (inp->inp_flags & INP_DROPPED) {
+
+		/* socket closed by the kernel before hw told us it connected */
+
+		send_flowc_wr(toep, NULL);
+		send_reset(sc, toep, be32toh(cpl->snd_isn));
+		goto done;
+	}
+
+	make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
+done:
+	INP_WUNLOCK(inp);
+	return (0);
+}
+
+static inline int
+act_open_has_tid(unsigned int status)
+{
+
+	return (status != CPL_ERR_TCAM_FULL &&
+	    status != CPL_ERR_TCAM_PARITY &&
+	    status != CPL_ERR_CONN_EXIST &&
+	    status != CPL_ERR_ARP_MISS);
+}
+
+/*
+ * Convert an ACT_OPEN_RPL status to an errno.
+ */
+static inline int
+act_open_rpl_status_to_errno(int status)
+{
+
+	switch (status) {
+	case CPL_ERR_CONN_RESET:
+		return (ECONNREFUSED);
+	case CPL_ERR_ARP_MISS:
+		return (EHOSTUNREACH);
+	case CPL_ERR_CONN_TIMEDOUT:
+		return (ETIMEDOUT);
+	case CPL_ERR_TCAM_FULL:
+		return (ENOMEM);
+	case CPL_ERR_CONN_EXIST:
+		log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n");
+		return (EADDRINUSE);
+	default:
+		return (EIO);
+	}
+}
+
+static int
+do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
+    struct mbuf *m)
+{
+	struct adapter *sc = iq->adapter;
+	const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1);
+	unsigned int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status)));
+	unsigned int status = G_AOPEN_STATUS(be32toh(cpl->atid_status));
+	struct toepcb *toep = lookup_atid(sc, atid);
+	struct inpcb *inp = toep->inp;
+	struct tcpcb *tp = intotcpcb(inp);
+	struct toedev *tod = &toep->td->tod;
+
+	KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
+	KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
+
+	CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status);
+
+	/* Ignore negative advice */
+	if (status == CPL_ERR_RTX_NEG_ADVICE)
+		return (0);
+
+	free_atid(sc, atid);
+	toep->tid = -1;
+
+	if (status && act_open_has_tid(status))
+		release_tid(sc, GET_TID(cpl), toep->ctrlq);
+
+	if (status == CPL_ERR_TCAM_FULL) {
+		INP_WLOCK(inp);
+		toe_connect_failed(tod, tp, EAGAIN);
+		final_cpl_received(toep);	/* unlocks inp */
+	} else {
+		INP_INFO_WLOCK(&V_tcbinfo);
+		INP_WLOCK(inp);
+		toe_connect_failed(tod, tp, act_open_rpl_status_to_errno(status));
+		final_cpl_received(toep);	/* unlocks inp */
+		INP_INFO_WUNLOCK(&V_tcbinfo);
+	}
+
+	return (0);
+}
+
+/*
+ * Options2 for active open.
+ */
+static uint32_t
+calc_opt2a(struct socket *so)
+{
+	struct tcpcb *tp = so_sototcpcb(so);
+	struct toepcb *toep = tp->t_toe;
+	struct port_info *pi = toep->port;
+	struct adapter *sc = pi->adapter;
+	uint32_t opt2 = 0;
+
+	if (tp->t_flags & TF_SACK_PERMIT)
+		opt2 |= F_SACK_EN;
+
+	if (tp->t_flags & TF_REQ_TSTMP)
+		opt2 |= F_TSTAMPS_EN;
+
+	if (tp->t_flags & TF_REQ_SCALE)
+		opt2 |= F_WND_SCALE_EN;
+
+	if (V_tcp_do_ecn)
+		opt2 |= F_CCTRL_ECN;
+
+	opt2 |= V_TX_QUEUE(sc->params.tp.tx_modq[pi->tx_chan]);
+	opt2 |= F_RX_COALESCE_VALID | V_RX_COALESCE(M_RX_COALESCE);
+	opt2 |= F_RSS_QUEUE_VALID | V_RSS_QUEUE(toep->ofld_rxq->iq.abs_id);
+
+	return (htobe32(opt2));
+}
+
+
+void
+t4_init_connect_cpl_handlers(struct adapter *sc)
+{
+
+	t4_register_cpl_handler(sc, CPL_ACT_ESTABLISH, do_act_establish);
+	t4_register_cpl_handler(sc, CPL_ACT_OPEN_RPL, do_act_open_rpl);
+}
+
+/*
+ * active open (soconnect).
+ *
+ * State of affairs on entry:
+ * soisconnecting (so_state |= SS_ISCONNECTING)
+ * tcbinfo not locked (This has changed - used to be WLOCKed)
+ * inp WLOCKed
+ * tp->t_state = TCPS_SYN_SENT
+ * rtalloc1, RT_UNLOCK on rt.
+ */
+int
+t4_connect(struct toedev *tod, struct socket *so, struct rtentry *rt,
+    struct sockaddr *nam)
+{
+	struct adapter *sc = tod->tod_softc;
+	struct toepcb *toep = NULL;
+	struct wrqe *wr = NULL;
+	struct cpl_act_open_req *cpl;
+	struct l2t_entry *e = NULL;
+	struct ifnet *rt_ifp = rt->rt_ifp;
+	struct port_info *pi;
+	int atid = -1, mtu_idx, rscale, qid_atid, rc = ENOMEM;
+	struct inpcb *inp = sotoinpcb(so);
+	struct tcpcb *tp = intotcpcb(inp);
+
+	INP_WLOCK_ASSERT(inp);
+
+	if (nam->sa_family != AF_INET)
+		CXGBE_UNIMPLEMENTED("IPv6 connect");
+
+	if (rt_ifp->if_type == IFT_ETHER)
+		pi = rt_ifp->if_softc;
+	else if (rt_ifp->if_type == IFT_L2VLAN) {
+		struct ifnet *ifp = VLAN_COOKIE(rt_ifp);
+
+		pi = ifp->if_softc;
+	} else if (rt_ifp->if_type == IFT_IEEE8023ADLAG)
+		return (ENOSYS);	/* XXX: implement lagg support */
+	else
+		return (ENOTSUP);
+
+	toep = alloc_toepcb(pi, -1, -1, M_NOWAIT);
+	if (toep == NULL)
+		goto failed;
+
+	atid = alloc_atid(sc, toep);
+	if (atid < 0)
+		goto failed;
+
+	e = t4_l2t_get(pi, rt_ifp,
+	    rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam);
+	if (e == NULL)
+		goto failed;
+
+	wr = alloc_wrqe(sizeof(*cpl), toep->ctrlq);
+	if (wr == NULL)
+		goto failed;
+	cpl = wrtod(wr);
+
+	toep->tid = atid;
+	toep->l2te = e;
+	toep->ulp_mode = ULP_MODE_NONE;
+	SOCKBUF_LOCK(&so->so_rcv);
+	/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
+	toep->rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ);
+	SOCKBUF_UNLOCK(&so->so_rcv);
+
+	offload_socket(so, toep);
+
+	/*
+	 * The kernel sets request_r_scale based on sb_max whereas we need to
+	 * take hardware's MAX_RCV_WND into account too.  This is normally a
+	 * no-op as MAX_RCV_WND is much larger than the default sb_max.
+	 */
+	if (tp->t_flags & TF_REQ_SCALE)
+		rscale = tp->request_r_scale = select_rcv_wscale();
+	else
+		rscale = 0;
+	mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0);
+	qid_atid = (toep->ofld_rxq->iq.abs_id << 14) | atid;
+
+	INIT_TP_WR(cpl, 0);
+	OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, qid_atid));
+	inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port, &cpl->peer_ip,
+	    &cpl->peer_port);
+	cpl->opt0 = calc_opt0(so, pi, e, mtu_idx, rscale, toep->rx_credits,
+	    toep->ulp_mode);
+	cpl->params = select_ntuple(pi, e, sc->filter_mode);
+	cpl->opt2 = calc_opt2a(so);
+
+	CTR5(KTR_CXGBE, "%s: atid %u (%s), toep %p, inp %p", __func__,
+	    toep->tid, tcpstates[tp->t_state], toep, inp);
+
+	rc = t4_l2t_send(sc, wr, e);
+	if (rc == 0) {
+		toepcb_set_flag(toep, TPF_CPL_PENDING);
+		return (0);
+	}
+
+	undo_offload_socket(so);
+failed:
+	CTR5(KTR_CXGBE, "%s: FAILED, atid %d, toep %p, l2te %p, wr %p",
+	    __func__, atid, toep, e, wr);
+
+	if (e)
+		t4_l2t_release(e);
+	if (wr)
+		free_wrqe(wr);
+	if (atid >= 0)
+		free_atid(sc, atid);
+	if (toep)
+		free_toepcb(toep);
+
+	return (rc);
+}
+#endif