netmap_pipe.c revision 285349
1261909Sluigi/* 2261909Sluigi * Copyright (C) 2014 Giuseppe Lettieri. All rights reserved. 3261909Sluigi * 4261909Sluigi * Redistribution and use in source and binary forms, with or without 5261909Sluigi * modification, are permitted provided that the following conditions 6261909Sluigi * are met: 7261909Sluigi * 1. Redistributions of source code must retain the above copyright 8261909Sluigi * notice, this list of conditions and the following disclaimer. 9261909Sluigi * 2. Redistributions in binary form must reproduce the above copyright 10261909Sluigi * notice, this list of conditions and the following disclaimer in the 11261909Sluigi * documentation and/or other materials provided with the distribution. 12261909Sluigi * 13261909Sluigi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14261909Sluigi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15261909Sluigi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16261909Sluigi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17261909Sluigi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18261909Sluigi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19261909Sluigi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20261909Sluigi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21261909Sluigi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22261909Sluigi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23261909Sluigi * SUCH DAMAGE. 24261909Sluigi */ 25261909Sluigi 26261909Sluigi/* $FreeBSD: head/sys/dev/netmap/netmap_pipe.c 285349 2015-07-10 05:51:36Z luigi $ */ 27261909Sluigi 28261909Sluigi#if defined(__FreeBSD__) 29261909Sluigi#include <sys/cdefs.h> /* prerequisite */ 30261909Sluigi 31261909Sluigi#include <sys/types.h> 32261909Sluigi#include <sys/errno.h> 33261909Sluigi#include <sys/param.h> /* defines used in kernel.h */ 34261909Sluigi#include <sys/kernel.h> /* types used in module initialization */ 35261909Sluigi#include <sys/malloc.h> 36261909Sluigi#include <sys/poll.h> 37261909Sluigi#include <sys/lock.h> 38261909Sluigi#include <sys/rwlock.h> 39261909Sluigi#include <sys/selinfo.h> 40261909Sluigi#include <sys/sysctl.h> 41261909Sluigi#include <sys/socket.h> /* sockaddrs */ 42261909Sluigi#include <net/if.h> 43261909Sluigi#include <net/if_var.h> 44261909Sluigi#include <machine/bus.h> /* bus_dmamap_* */ 45261909Sluigi#include <sys/refcount.h> 46261909Sluigi 47261909Sluigi 48261909Sluigi#elif defined(linux) 49261909Sluigi 50261909Sluigi#include "bsd_glue.h" 51261909Sluigi 52261909Sluigi#elif defined(__APPLE__) 53261909Sluigi 54261909Sluigi#warning OSX support is only partial 55261909Sluigi#include "osx_glue.h" 56261909Sluigi 57261909Sluigi#else 58261909Sluigi 59261909Sluigi#error Unsupported platform 60261909Sluigi 61261909Sluigi#endif /* unsupported */ 62261909Sluigi 63261909Sluigi/* 64261909Sluigi * common headers 65261909Sluigi */ 66261909Sluigi 67261909Sluigi#include <net/netmap.h> 68261909Sluigi#include <dev/netmap/netmap_kern.h> 69261909Sluigi#include <dev/netmap/netmap_mem2.h> 70261909Sluigi 71261909Sluigi#ifdef WITH_PIPES 72261909Sluigi 73261909Sluigi#define NM_PIPE_MAXSLOTS 4096 74261909Sluigi 75285349Sluigiint netmap_default_pipes = 0; /* ignored, kept for compatibility */ 76261909SluigiSYSCTL_DECL(_dev_netmap); 77261909SluigiSYSCTL_INT(_dev_netmap, OID_AUTO, default_pipes, CTLFLAG_RW, &netmap_default_pipes, 0 , ""); 78261909Sluigi 79261909Sluigi/* allocate the pipe array in the parent adapter */ 80285349Sluigistatic int 81285349Sluiginm_pipe_alloc(struct netmap_adapter *na, u_int npipes) 82261909Sluigi{ 83261909Sluigi size_t len; 84285349Sluigi struct netmap_pipe_adapter **npa; 85261909Sluigi 86285349Sluigi if (npipes <= na->na_max_pipes) 87285349Sluigi /* we already have more entries that requested */ 88261909Sluigi return 0; 89285349Sluigi 90285349Sluigi if (npipes < na->na_next_pipe || npipes > NM_MAXPIPES) 91285349Sluigi return EINVAL; 92261909Sluigi 93285349Sluigi len = sizeof(struct netmap_pipe_adapter *) * npipes; 94285349Sluigi npa = realloc(na->na_pipes, len, M_DEVBUF, M_NOWAIT | M_ZERO); 95285349Sluigi if (npa == NULL) 96261909Sluigi return ENOMEM; 97261909Sluigi 98285349Sluigi na->na_pipes = npa; 99261909Sluigi na->na_max_pipes = npipes; 100261909Sluigi 101261909Sluigi return 0; 102261909Sluigi} 103261909Sluigi 104261909Sluigi/* deallocate the parent array in the parent adapter */ 105261909Sluigivoid 106261909Sluiginetmap_pipe_dealloc(struct netmap_adapter *na) 107261909Sluigi{ 108261909Sluigi if (na->na_pipes) { 109285349Sluigi if (na->na_next_pipe > 0) { 110285349Sluigi D("freeing not empty pipe array for %s (%d dangling pipes)!", na->name, 111285349Sluigi na->na_next_pipe); 112285349Sluigi } 113261909Sluigi free(na->na_pipes, M_DEVBUF); 114261909Sluigi na->na_pipes = NULL; 115261909Sluigi na->na_max_pipes = 0; 116261909Sluigi na->na_next_pipe = 0; 117261909Sluigi } 118261909Sluigi} 119261909Sluigi 120261909Sluigi/* find a pipe endpoint with the given id among the parent's pipes */ 121261909Sluigistatic struct netmap_pipe_adapter * 122261909Sluiginetmap_pipe_find(struct netmap_adapter *parent, u_int pipe_id) 123261909Sluigi{ 124261909Sluigi int i; 125261909Sluigi struct netmap_pipe_adapter *na; 126261909Sluigi 127261909Sluigi for (i = 0; i < parent->na_next_pipe; i++) { 128261909Sluigi na = parent->na_pipes[i]; 129261909Sluigi if (na->id == pipe_id) { 130261909Sluigi return na; 131261909Sluigi } 132261909Sluigi } 133261909Sluigi return NULL; 134261909Sluigi} 135261909Sluigi 136261909Sluigi/* add a new pipe endpoint to the parent array */ 137261909Sluigistatic int 138261909Sluiginetmap_pipe_add(struct netmap_adapter *parent, struct netmap_pipe_adapter *na) 139261909Sluigi{ 140261909Sluigi if (parent->na_next_pipe >= parent->na_max_pipes) { 141285349Sluigi u_int npipes = parent->na_max_pipes ? 2*parent->na_max_pipes : 2; 142285349Sluigi int error = nm_pipe_alloc(parent, npipes); 143285349Sluigi if (error) 144285349Sluigi return error; 145261909Sluigi } 146261909Sluigi 147261909Sluigi parent->na_pipes[parent->na_next_pipe] = na; 148261909Sluigi na->parent_slot = parent->na_next_pipe; 149261909Sluigi parent->na_next_pipe++; 150261909Sluigi return 0; 151261909Sluigi} 152261909Sluigi 153261909Sluigi/* remove the given pipe endpoint from the parent array */ 154261909Sluigistatic void 155261909Sluiginetmap_pipe_remove(struct netmap_adapter *parent, struct netmap_pipe_adapter *na) 156261909Sluigi{ 157261909Sluigi u_int n; 158261909Sluigi n = --parent->na_next_pipe; 159261909Sluigi if (n != na->parent_slot) { 160285349Sluigi struct netmap_pipe_adapter **p = 161285349Sluigi &parent->na_pipes[na->parent_slot]; 162285349Sluigi *p = parent->na_pipes[n]; 163285349Sluigi (*p)->parent_slot = na->parent_slot; 164261909Sluigi } 165261909Sluigi parent->na_pipes[n] = NULL; 166261909Sluigi} 167261909Sluigi 168261909Sluigistatic int 169270063Sluiginetmap_pipe_txsync(struct netmap_kring *txkring, int flags) 170261909Sluigi{ 171270063Sluigi struct netmap_kring *rxkring = txkring->pipe; 172261909Sluigi u_int limit; /* slots to transfer */ 173261909Sluigi u_int j, k, lim_tx = txkring->nkr_num_slots - 1, 174261909Sluigi lim_rx = rxkring->nkr_num_slots - 1; 175261909Sluigi int m, busy; 176261909Sluigi 177261909Sluigi ND("%p: %s %x -> %s", txkring, txkring->name, flags, rxkring->name); 178261909Sluigi ND(2, "before: hwcur %d hwtail %d cur %d head %d tail %d", txkring->nr_hwcur, txkring->nr_hwtail, 179261909Sluigi txkring->rcur, txkring->rhead, txkring->rtail); 180261909Sluigi 181261909Sluigi j = rxkring->nr_hwtail; /* RX */ 182261909Sluigi k = txkring->nr_hwcur; /* TX */ 183261909Sluigi m = txkring->rhead - txkring->nr_hwcur; /* new slots */ 184261909Sluigi if (m < 0) 185261909Sluigi m += txkring->nkr_num_slots; 186261909Sluigi limit = m; 187274361Sluigi m = lim_rx; /* max avail space on destination */ 188261909Sluigi busy = j - rxkring->nr_hwcur; /* busy slots */ 189261909Sluigi if (busy < 0) 190274361Sluigi busy += rxkring->nkr_num_slots; 191261909Sluigi m -= busy; /* subtract busy slots */ 192261909Sluigi ND(2, "m %d limit %d", m, limit); 193261909Sluigi if (m < limit) 194261909Sluigi limit = m; 195261909Sluigi 196261909Sluigi if (limit == 0) { 197261909Sluigi /* either the rxring is full, or nothing to send */ 198261909Sluigi return 0; 199261909Sluigi } 200261909Sluigi 201261909Sluigi while (limit-- > 0) { 202261909Sluigi struct netmap_slot *rs = &rxkring->save_ring->slot[j]; 203261909Sluigi struct netmap_slot *ts = &txkring->ring->slot[k]; 204261909Sluigi struct netmap_slot tmp; 205261909Sluigi 206261909Sluigi /* swap the slots */ 207261909Sluigi tmp = *rs; 208261909Sluigi *rs = *ts; 209261909Sluigi *ts = tmp; 210261909Sluigi 211285349Sluigi /* report the buffer change */ 212285349Sluigi ts->flags |= NS_BUF_CHANGED; 213285349Sluigi rs->flags |= NS_BUF_CHANGED; 214261909Sluigi 215261909Sluigi j = nm_next(j, lim_rx); 216261909Sluigi k = nm_next(k, lim_tx); 217261909Sluigi } 218261909Sluigi 219274457Sluigi mb(); /* make sure the slots are updated before publishing them */ 220261909Sluigi rxkring->nr_hwtail = j; 221261909Sluigi txkring->nr_hwcur = k; 222261909Sluigi txkring->nr_hwtail = nm_prev(k, lim_tx); 223261909Sluigi 224261909Sluigi ND(2, "after: hwcur %d hwtail %d cur %d head %d tail %d j %d", txkring->nr_hwcur, txkring->nr_hwtail, 225261909Sluigi txkring->rcur, txkring->rhead, txkring->rtail, j); 226261909Sluigi 227274457Sluigi mb(); /* make sure rxkring->nr_hwtail is updated before notifying */ 228285349Sluigi rxkring->nm_notify(rxkring, 0); 229261909Sluigi 230261909Sluigi return 0; 231261909Sluigi} 232261909Sluigi 233261909Sluigistatic int 234270063Sluiginetmap_pipe_rxsync(struct netmap_kring *rxkring, int flags) 235261909Sluigi{ 236270063Sluigi struct netmap_kring *txkring = rxkring->pipe; 237261909Sluigi uint32_t oldhwcur = rxkring->nr_hwcur; 238261909Sluigi 239261909Sluigi ND("%s %x <- %s", rxkring->name, flags, txkring->name); 240261909Sluigi rxkring->nr_hwcur = rxkring->rhead; /* recover user-relased slots */ 241261909Sluigi ND(5, "hwcur %d hwtail %d cur %d head %d tail %d", rxkring->nr_hwcur, rxkring->nr_hwtail, 242261909Sluigi rxkring->rcur, rxkring->rhead, rxkring->rtail); 243274457Sluigi mb(); /* paired with the first mb() in txsync */ 244261909Sluigi 245261909Sluigi if (oldhwcur != rxkring->nr_hwcur) { 246261909Sluigi /* we have released some slots, notify the other end */ 247274457Sluigi mb(); /* make sure nr_hwcur is updated before notifying */ 248285349Sluigi txkring->nm_notify(txkring, 0); 249261909Sluigi } 250261909Sluigi return 0; 251261909Sluigi} 252261909Sluigi 253261909Sluigi/* Pipe endpoints are created and destroyed together, so that endopoints do not 254261909Sluigi * have to check for the existence of their peer at each ?xsync. 255261909Sluigi * 256261909Sluigi * To play well with the existing netmap infrastructure (refcounts etc.), we 257261909Sluigi * adopt the following strategy: 258261909Sluigi * 259261909Sluigi * 1) The first endpoint that is created also creates the other endpoint and 260261909Sluigi * grabs a reference to it. 261261909Sluigi * 262261909Sluigi * state A) user1 --> endpoint1 --> endpoint2 263261909Sluigi * 264261909Sluigi * 2) If, starting from state A, endpoint2 is then registered, endpoint1 gives 265261909Sluigi * its reference to the user: 266261909Sluigi * 267261909Sluigi * state B) user1 --> endpoint1 endpoint2 <--- user2 268261909Sluigi * 269261909Sluigi * 3) Assume that, starting from state B endpoint2 is closed. In the unregister 270261909Sluigi * callback endpoint2 notes that endpoint1 is still active and adds a reference 271261909Sluigi * from endpoint1 to itself. When user2 then releases her own reference, 272261909Sluigi * endpoint2 is not destroyed and we are back to state A. A symmetrical state 273261909Sluigi * would be reached if endpoint1 were released instead. 274261909Sluigi * 275261909Sluigi * 4) If, starting from state A, endpoint1 is closed, the destructor notes that 276261909Sluigi * it owns a reference to endpoint2 and releases it. 277261909Sluigi * 278261909Sluigi * Something similar goes on for the creation and destruction of the krings. 279261909Sluigi */ 280261909Sluigi 281261909Sluigi 282261909Sluigi/* netmap_pipe_krings_delete. 283261909Sluigi * 284261909Sluigi * There are two cases: 285261909Sluigi * 286261909Sluigi * 1) state is 287261909Sluigi * 288261909Sluigi * usr1 --> e1 --> e2 289261909Sluigi * 290261909Sluigi * and we are e1. We have to create both sets 291261909Sluigi * of krings. 292261909Sluigi * 293261909Sluigi * 2) state is 294261909Sluigi * 295261909Sluigi * usr1 --> e1 --> e2 296261909Sluigi * 297261909Sluigi * and we are e2. e1 is certainly registered and our 298261909Sluigi * krings already exist, but they may be hidden. 299261909Sluigi */ 300261909Sluigistatic int 301261909Sluiginetmap_pipe_krings_create(struct netmap_adapter *na) 302261909Sluigi{ 303261909Sluigi struct netmap_pipe_adapter *pna = 304261909Sluigi (struct netmap_pipe_adapter *)na; 305261909Sluigi struct netmap_adapter *ona = &pna->peer->up; 306261909Sluigi int error = 0; 307285349Sluigi enum txrx t; 308285349Sluigi 309261909Sluigi if (pna->peer_ref) { 310261909Sluigi int i; 311261909Sluigi 312261909Sluigi /* case 1) above */ 313285349Sluigi ND("%p: case 1, create everything", na); 314261909Sluigi error = netmap_krings_create(na, 0); 315261909Sluigi if (error) 316261909Sluigi goto err; 317261909Sluigi 318261909Sluigi /* we also create all the rings, since we need to 319261909Sluigi * update the save_ring pointers. 320261909Sluigi * netmap_mem_rings_create (called by our caller) 321261909Sluigi * will not create the rings again 322261909Sluigi */ 323261909Sluigi 324261909Sluigi error = netmap_mem_rings_create(na); 325261909Sluigi if (error) 326261909Sluigi goto del_krings1; 327261909Sluigi 328261909Sluigi /* update our hidden ring pointers */ 329285349Sluigi for_rx_tx(t) { 330285349Sluigi for (i = 0; i < nma_get_nrings(na, t) + 1; i++) 331285349Sluigi NMR(na, t)[i].save_ring = NMR(na, t)[i].ring; 332285349Sluigi } 333261909Sluigi 334261909Sluigi /* now, create krings and rings of the other end */ 335261909Sluigi error = netmap_krings_create(ona, 0); 336261909Sluigi if (error) 337261909Sluigi goto del_rings1; 338261909Sluigi 339261909Sluigi error = netmap_mem_rings_create(ona); 340261909Sluigi if (error) 341261909Sluigi goto del_krings2; 342261909Sluigi 343285349Sluigi for_rx_tx(t) { 344285349Sluigi for (i = 0; i < nma_get_nrings(ona, t) + 1; i++) 345285349Sluigi NMR(ona, t)[i].save_ring = NMR(ona, t)[i].ring; 346285349Sluigi } 347261909Sluigi 348261909Sluigi /* cross link the krings */ 349285349Sluigi for_rx_tx(t) { 350285349Sluigi enum txrx r= nm_txrx_swap(t); /* swap NR_TX <-> NR_RX */ 351285349Sluigi for (i = 0; i < nma_get_nrings(na, t); i++) { 352285349Sluigi NMR(na, t)[i].pipe = NMR(&pna->peer->up, r) + i; 353285349Sluigi NMR(&pna->peer->up, r)[i].pipe = NMR(na, t) + i; 354285349Sluigi } 355261909Sluigi } 356261909Sluigi } else { 357261909Sluigi int i; 358261909Sluigi /* case 2) above */ 359261909Sluigi /* recover the hidden rings */ 360261909Sluigi ND("%p: case 2, hidden rings", na); 361285349Sluigi for_rx_tx(t) { 362285349Sluigi for (i = 0; i < nma_get_nrings(na, t) + 1; i++) 363285349Sluigi NMR(na, t)[i].ring = NMR(na, t)[i].save_ring; 364285349Sluigi } 365261909Sluigi } 366261909Sluigi return 0; 367261909Sluigi 368261909Sluigidel_krings2: 369261909Sluigi netmap_krings_delete(ona); 370261909Sluigidel_rings1: 371261909Sluigi netmap_mem_rings_delete(na); 372261909Sluigidel_krings1: 373261909Sluigi netmap_krings_delete(na); 374261909Sluigierr: 375261909Sluigi return error; 376261909Sluigi} 377261909Sluigi 378261909Sluigi/* netmap_pipe_reg. 379261909Sluigi * 380261909Sluigi * There are two cases on registration (onoff==1) 381267128Sluigi * 382261909Sluigi * 1.a) state is 383261909Sluigi * 384261909Sluigi * usr1 --> e1 --> e2 385261909Sluigi * 386261909Sluigi * and we are e1. Nothing special to do. 387261909Sluigi * 388261909Sluigi * 1.b) state is 389261909Sluigi * 390261909Sluigi * usr1 --> e1 --> e2 <-- usr2 391261909Sluigi * 392261909Sluigi * and we are e2. Drop the ref e1 is holding. 393267128Sluigi * 394261909Sluigi * There are two additional cases on unregister (onoff==0) 395261909Sluigi * 396261909Sluigi * 2.a) state is 397261909Sluigi * 398261909Sluigi * usr1 --> e1 --> e2 399261909Sluigi * 400261909Sluigi * and we are e1. Nothing special to do, e2 will 401261909Sluigi * be cleaned up by the destructor of e1. 402261909Sluigi * 403261909Sluigi * 2.b) state is 404261909Sluigi * 405261909Sluigi * usr1 --> e1 e2 <-- usr2 406261909Sluigi * 407261909Sluigi * and we are either e1 or e2. Add a ref from the 408261909Sluigi * other end and hide our rings. 409261909Sluigi */ 410261909Sluigistatic int 411261909Sluiginetmap_pipe_reg(struct netmap_adapter *na, int onoff) 412261909Sluigi{ 413261909Sluigi struct netmap_pipe_adapter *pna = 414261909Sluigi (struct netmap_pipe_adapter *)na; 415285349Sluigi enum txrx t; 416285349Sluigi 417261909Sluigi ND("%p: onoff %d", na, onoff); 418261909Sluigi if (onoff) { 419270063Sluigi na->na_flags |= NAF_NETMAP_ON; 420261909Sluigi } else { 421270063Sluigi na->na_flags &= ~NAF_NETMAP_ON; 422261909Sluigi } 423261909Sluigi if (pna->peer_ref) { 424261909Sluigi ND("%p: case 1.a or 2.a, nothing to do", na); 425261909Sluigi return 0; 426261909Sluigi } 427261909Sluigi if (onoff) { 428261909Sluigi ND("%p: case 1.b, drop peer", na); 429261909Sluigi pna->peer->peer_ref = 0; 430261909Sluigi netmap_adapter_put(na); 431261909Sluigi } else { 432261909Sluigi int i; 433261909Sluigi ND("%p: case 2.b, grab peer", na); 434261909Sluigi netmap_adapter_get(na); 435261909Sluigi pna->peer->peer_ref = 1; 436261909Sluigi /* hide our rings from netmap_mem_rings_delete */ 437285349Sluigi for_rx_tx(t) { 438285349Sluigi for (i = 0; i < nma_get_nrings(na, t) + 1; i++) { 439285349Sluigi NMR(na, t)[i].ring = NULL; 440285349Sluigi } 441261909Sluigi } 442261909Sluigi } 443261909Sluigi return 0; 444261909Sluigi} 445261909Sluigi 446261909Sluigi/* netmap_pipe_krings_delete. 447261909Sluigi * 448261909Sluigi * There are two cases: 449261909Sluigi * 450261909Sluigi * 1) state is 451261909Sluigi * 452267128Sluigi * usr1 --> e1 --> e2 453261909Sluigi * 454267128Sluigi * and we are e1 (e2 is not registered, so krings_delete cannot be 455261909Sluigi * called on it); 456261909Sluigi * 457261909Sluigi * 2) state is 458261909Sluigi * 459267128Sluigi * usr1 --> e1 e2 <-- usr2 460261909Sluigi * 461261909Sluigi * and we are either e1 or e2. 462261909Sluigi * 463261909Sluigi * In the former case we have to also delete the krings of e2; 464261909Sluigi * in the latter case we do nothing (note that our krings 465261909Sluigi * have already been hidden in the unregister callback). 466261909Sluigi */ 467261909Sluigistatic void 468261909Sluiginetmap_pipe_krings_delete(struct netmap_adapter *na) 469261909Sluigi{ 470261909Sluigi struct netmap_pipe_adapter *pna = 471261909Sluigi (struct netmap_pipe_adapter *)na; 472261909Sluigi struct netmap_adapter *ona; /* na of the other end */ 473261909Sluigi int i; 474285349Sluigi enum txrx t; 475261909Sluigi 476261909Sluigi if (!pna->peer_ref) { 477261909Sluigi ND("%p: case 2, kept alive by peer", na); 478261909Sluigi return; 479261909Sluigi } 480261909Sluigi /* case 1) above */ 481261909Sluigi ND("%p: case 1, deleting everyhing", na); 482261909Sluigi netmap_krings_delete(na); /* also zeroes tx_rings etc. */ 483261909Sluigi /* restore the ring to be deleted on the peer */ 484261909Sluigi ona = &pna->peer->up; 485261909Sluigi if (ona->tx_rings == NULL) { 486261909Sluigi /* already deleted, we must be on an 487261909Sluigi * cleanup-after-error path */ 488261909Sluigi return; 489261909Sluigi } 490285349Sluigi for_rx_tx(t) { 491285349Sluigi for (i = 0; i < nma_get_nrings(ona, t) + 1; i++) 492285349Sluigi NMR(ona, t)[i].ring = NMR(ona, t)[i].save_ring; 493285349Sluigi } 494261909Sluigi netmap_mem_rings_delete(ona); 495261909Sluigi netmap_krings_delete(ona); 496261909Sluigi} 497261909Sluigi 498261909Sluigi 499261909Sluigistatic void 500261909Sluiginetmap_pipe_dtor(struct netmap_adapter *na) 501261909Sluigi{ 502261909Sluigi struct netmap_pipe_adapter *pna = 503261909Sluigi (struct netmap_pipe_adapter *)na; 504261909Sluigi ND("%p", na); 505261909Sluigi if (pna->peer_ref) { 506261909Sluigi ND("%p: clean up peer", na); 507261909Sluigi pna->peer_ref = 0; 508261909Sluigi netmap_adapter_put(&pna->peer->up); 509261909Sluigi } 510267128Sluigi if (pna->role == NR_REG_PIPE_MASTER) 511261909Sluigi netmap_pipe_remove(pna->parent, pna); 512261909Sluigi netmap_adapter_put(pna->parent); 513261909Sluigi pna->parent = NULL; 514261909Sluigi} 515261909Sluigi 516261909Sluigiint 517261909Sluiginetmap_get_pipe_na(struct nmreq *nmr, struct netmap_adapter **na, int create) 518261909Sluigi{ 519261909Sluigi struct nmreq pnmr; 520261909Sluigi struct netmap_adapter *pna; /* parent adapter */ 521261909Sluigi struct netmap_pipe_adapter *mna, *sna, *req; 522261909Sluigi u_int pipe_id; 523261909Sluigi int role = nmr->nr_flags & NR_REG_MASK; 524261909Sluigi int error; 525261909Sluigi 526261909Sluigi ND("flags %x", nmr->nr_flags); 527261909Sluigi 528261909Sluigi if (role != NR_REG_PIPE_MASTER && role != NR_REG_PIPE_SLAVE) { 529261909Sluigi ND("not a pipe"); 530261909Sluigi return 0; 531261909Sluigi } 532261909Sluigi role = nmr->nr_flags & NR_REG_MASK; 533261909Sluigi 534261909Sluigi /* first, try to find the parent adapter */ 535261909Sluigi bzero(&pnmr, sizeof(pnmr)); 536261909Sluigi memcpy(&pnmr.nr_name, nmr->nr_name, IFNAMSIZ); 537261909Sluigi /* pass to parent the requested number of pipes */ 538261909Sluigi pnmr.nr_arg1 = nmr->nr_arg1; 539261909Sluigi error = netmap_get_na(&pnmr, &pna, create); 540261909Sluigi if (error) { 541261909Sluigi ND("parent lookup failed: %d", error); 542261909Sluigi return error; 543261909Sluigi } 544270063Sluigi ND("found parent: %s", na->name); 545261909Sluigi 546261909Sluigi if (NETMAP_OWNED_BY_KERN(pna)) { 547261909Sluigi ND("parent busy"); 548261909Sluigi error = EBUSY; 549261909Sluigi goto put_out; 550261909Sluigi } 551261909Sluigi 552261909Sluigi /* next, lookup the pipe id in the parent list */ 553261909Sluigi req = NULL; 554261909Sluigi pipe_id = nmr->nr_ringid & NETMAP_RING_MASK; 555261909Sluigi mna = netmap_pipe_find(pna, pipe_id); 556261909Sluigi if (mna) { 557261909Sluigi if (mna->role == role) { 558261909Sluigi ND("found %d directly at %d", pipe_id, mna->parent_slot); 559261909Sluigi req = mna; 560261909Sluigi } else { 561261909Sluigi ND("found %d indirectly at %d", pipe_id, mna->parent_slot); 562261909Sluigi req = mna->peer; 563261909Sluigi } 564261909Sluigi /* the pipe we have found already holds a ref to the parent, 565261909Sluigi * so we need to drop the one we got from netmap_get_na() 566261909Sluigi */ 567261909Sluigi netmap_adapter_put(pna); 568261909Sluigi goto found; 569261909Sluigi } 570261909Sluigi ND("pipe %d not found, create %d", pipe_id, create); 571261909Sluigi if (!create) { 572261909Sluigi error = ENODEV; 573261909Sluigi goto put_out; 574261909Sluigi } 575267128Sluigi /* we create both master and slave. 576261909Sluigi * The endpoint we were asked for holds a reference to 577261909Sluigi * the other one. 578261909Sluigi */ 579261909Sluigi mna = malloc(sizeof(*mna), M_DEVBUF, M_NOWAIT | M_ZERO); 580261909Sluigi if (mna == NULL) { 581261909Sluigi error = ENOMEM; 582270063Sluigi goto put_out; 583261909Sluigi } 584270063Sluigi snprintf(mna->up.name, sizeof(mna->up.name), "%s{%d", pna->name, pipe_id); 585261909Sluigi 586261909Sluigi mna->id = pipe_id; 587261909Sluigi mna->role = NR_REG_PIPE_MASTER; 588261909Sluigi mna->parent = pna; 589261909Sluigi 590261909Sluigi mna->up.nm_txsync = netmap_pipe_txsync; 591261909Sluigi mna->up.nm_rxsync = netmap_pipe_rxsync; 592261909Sluigi mna->up.nm_register = netmap_pipe_reg; 593261909Sluigi mna->up.nm_dtor = netmap_pipe_dtor; 594261909Sluigi mna->up.nm_krings_create = netmap_pipe_krings_create; 595261909Sluigi mna->up.nm_krings_delete = netmap_pipe_krings_delete; 596261909Sluigi mna->up.nm_mem = pna->nm_mem; 597261909Sluigi mna->up.na_lut = pna->na_lut; 598261909Sluigi 599261909Sluigi mna->up.num_tx_rings = 1; 600261909Sluigi mna->up.num_rx_rings = 1; 601261909Sluigi mna->up.num_tx_desc = nmr->nr_tx_slots; 602261909Sluigi nm_bound_var(&mna->up.num_tx_desc, pna->num_tx_desc, 603261909Sluigi 1, NM_PIPE_MAXSLOTS, NULL); 604261909Sluigi mna->up.num_rx_desc = nmr->nr_rx_slots; 605261909Sluigi nm_bound_var(&mna->up.num_rx_desc, pna->num_rx_desc, 606261909Sluigi 1, NM_PIPE_MAXSLOTS, NULL); 607261909Sluigi error = netmap_attach_common(&mna->up); 608261909Sluigi if (error) 609270063Sluigi goto free_mna; 610261909Sluigi /* register the master with the parent */ 611261909Sluigi error = netmap_pipe_add(pna, mna); 612261909Sluigi if (error) 613261909Sluigi goto free_mna; 614261909Sluigi 615261909Sluigi /* create the slave */ 616261909Sluigi sna = malloc(sizeof(*mna), M_DEVBUF, M_NOWAIT | M_ZERO); 617261909Sluigi if (sna == NULL) { 618261909Sluigi error = ENOMEM; 619270063Sluigi goto free_mna; 620261909Sluigi } 621261909Sluigi /* most fields are the same, copy from master and then fix */ 622261909Sluigi *sna = *mna; 623270063Sluigi snprintf(sna->up.name, sizeof(sna->up.name), "%s}%d", pna->name, pipe_id); 624261909Sluigi sna->role = NR_REG_PIPE_SLAVE; 625261909Sluigi error = netmap_attach_common(&sna->up); 626261909Sluigi if (error) 627261909Sluigi goto free_sna; 628261909Sluigi 629261909Sluigi /* join the two endpoints */ 630261909Sluigi mna->peer = sna; 631261909Sluigi sna->peer = mna; 632261909Sluigi 633261909Sluigi /* we already have a reference to the parent, but we 634261909Sluigi * need another one for the other endpoint we created 635261909Sluigi */ 636261909Sluigi netmap_adapter_get(pna); 637261909Sluigi 638261909Sluigi if (role == NR_REG_PIPE_MASTER) { 639261909Sluigi req = mna; 640261909Sluigi mna->peer_ref = 1; 641261909Sluigi netmap_adapter_get(&sna->up); 642261909Sluigi } else { 643261909Sluigi req = sna; 644261909Sluigi sna->peer_ref = 1; 645261909Sluigi netmap_adapter_get(&mna->up); 646261909Sluigi } 647261909Sluigi ND("created master %p and slave %p", mna, sna); 648261909Sluigifound: 649261909Sluigi 650261909Sluigi ND("pipe %d %s at %p", pipe_id, 651261909Sluigi (req->role == NR_REG_PIPE_MASTER ? "master" : "slave"), req); 652261909Sluigi *na = &req->up; 653261909Sluigi netmap_adapter_get(*na); 654261909Sluigi 655261909Sluigi /* write the configuration back */ 656261909Sluigi nmr->nr_tx_rings = req->up.num_tx_rings; 657261909Sluigi nmr->nr_rx_rings = req->up.num_rx_rings; 658261909Sluigi nmr->nr_tx_slots = req->up.num_tx_desc; 659261909Sluigi nmr->nr_rx_slots = req->up.num_rx_desc; 660261909Sluigi 661261909Sluigi /* keep the reference to the parent. 662261909Sluigi * It will be released by the req destructor 663261909Sluigi */ 664261909Sluigi 665261909Sluigi return 0; 666261909Sluigi 667261909Sluigifree_sna: 668261909Sluigi free(sna, M_DEVBUF); 669261909Sluigifree_mna: 670261909Sluigi free(mna, M_DEVBUF); 671261909Sluigiput_out: 672261909Sluigi netmap_adapter_put(pna); 673261909Sluigi return error; 674261909Sluigi} 675261909Sluigi 676261909Sluigi 677261909Sluigi#endif /* WITH_PIPES */ 678