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freebsd/sys/dev/netmap/if_re_netmap.h
Luigi Rizzo 847bf38369 Sync netmap sources with the version in our private tree. 
This commit contains large contributions from Giuseppe Lettieri and
Stefano Garzarella, is partly supported by grants from Verisign and Cisco,
and brings in the following:

- fix zerocopy monitor ports and introduce copying monitor ports
  (the latter are lower performance but give access to all traffic
  in parallel with the application)

- exclusive open mode, useful to implement solutions that recover
  from crashes of the main netmap client (suggested by Patrick Kelsey)

- revised memory allocator in preparation for the 'passthrough mode'
  (ptnetmap) recently presented at bsdcan. ptnetmap is described in
        S. Garzarella, G. Lettieri, L. Rizzo;
        Virtual device passthrough for high speed VM networking,
        ACM/IEEE ANCS 2015, Oakland (CA) May 2015
        http://info.iet.unipi.it/~luigi/research.html

- fix rx CRC handing on ixl

- add module dependencies for netmap when building drivers as modules

- minor simplifications to device-specific routines (*txsync, *rxsync)

- general code cleanup (remove unused variables, introduce macros
  to access rings and remove duplicate code,

Applications do not need to be recompiled, unless of course
they want to use the new features (monitors and exclusive open).

Those willing to try this code on stable/10 can just update the
sys/dev/netmap/*, sys/net/netmap* with the version in HEAD
and apply the small patches to individual device drivers.

MFC after:	1 month
Sponsored by:	(partly) Verisign, Cisco
2015-07-10 05:51:36 +00:00

375 lines
11 KiB
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/*
* Copyright (C) 2011-2014 Luigi Rizzo. All rights reserved.
*
* 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.
*/
/*
* $FreeBSD$
*
* netmap support for: re
*
* For more details on netmap support please see ixgbe_netmap.h
*/
#include <net/netmap.h>
#include <sys/selinfo.h>
#include <vm/vm.h>
#include <vm/pmap.h> /* vtophys ? */
#include <dev/netmap/netmap_kern.h>
/*
* Register/unregister. We are already under netmap lock.
*/
static int
re_netmap_reg(struct netmap_adapter *na, int onoff)
{
struct ifnet *ifp = na->ifp;
struct rl_softc *adapter = ifp->if_softc;
RL_LOCK(adapter);
re_stop(adapter); /* also clears IFF_DRV_RUNNING */
if (onoff) {
nm_set_native_flags(na);
} else {
nm_clear_native_flags(na);
}
re_init_locked(adapter); /* also enables intr */
RL_UNLOCK(adapter);
return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1);
}
/*
* Reconcile kernel and user view of the transmit ring.
*/
static int
re_netmap_txsync(struct netmap_kring *kring, int flags)
{
struct netmap_adapter *na = kring->na;
struct ifnet *ifp = na->ifp;
struct netmap_ring *ring = kring->ring;
u_int nm_i; /* index into the netmap ring */
u_int nic_i; /* index into the NIC ring */
u_int n;
u_int const lim = kring->nkr_num_slots - 1;
u_int const head = kring->rhead;
/* device-specific */
struct rl_softc *sc = ifp->if_softc;
struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc;
bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
sc->rl_ldata.rl_tx_list_map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ?
/*
* First part: process new packets to send.
*/
nm_i = kring->nr_hwcur;
if (nm_i != head) { /* we have new packets to send */
nic_i = sc->rl_ldata.rl_tx_prodidx;
// XXX or netmap_idx_k2n(kring, nm_i);
for (n = 0; nm_i != head; n++) {
struct netmap_slot *slot = &ring->slot[nm_i];
u_int len = slot->len;
uint64_t paddr;
void *addr = PNMB(na, slot, &paddr);
/* device-specific */
struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i];
int cmd = slot->len | RL_TDESC_CMD_EOF |
RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ;
NM_CHECK_ADDR_LEN(na, addr, len);
if (nic_i == lim) /* mark end of ring */
cmd |= RL_TDESC_CMD_EOR;
if (slot->flags & NS_BUF_CHANGED) {
/* buffer has changed, reload map */
desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
netmap_reload_map(na, sc->rl_ldata.rl_tx_mtag,
txd[nic_i].tx_dmamap, addr);
}
slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED);
/* Fill the slot in the NIC ring. */
desc->rl_cmdstat = htole32(cmd);
/* make sure changes to the buffer are synced */
bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag,
txd[nic_i].tx_dmamap,
BUS_DMASYNC_PREWRITE);
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
sc->rl_ldata.rl_tx_prodidx = nic_i;
kring->nr_hwcur = head;
/* synchronize the NIC ring */
bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag,
sc->rl_ldata.rl_tx_list_map,
BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
/* start ? */
CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START);
}
/*
* Second part: reclaim buffers for completed transmissions.
*/
if (flags & NAF_FORCE_RECLAIM || nm_kr_txempty(kring)) {
nic_i = sc->rl_ldata.rl_tx_considx;
for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx;
n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) {
uint32_t cmdstat =
le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat);
if (cmdstat & RL_TDESC_STAT_OWN)
break;
}
if (n > 0) {
sc->rl_ldata.rl_tx_considx = nic_i;
sc->rl_ldata.rl_tx_free += n;
kring->nr_hwtail = nm_prev(netmap_idx_n2k(kring, nic_i), lim);
}
}
return 0;
}
/*
* Reconcile kernel and user view of the receive ring.
*/
static int
re_netmap_rxsync(struct netmap_kring *kring, int flags)
{
struct netmap_adapter *na = kring->na;
struct ifnet *ifp = na->ifp;
struct netmap_ring *ring = kring->ring;
u_int nm_i; /* index into the netmap ring */
u_int nic_i; /* index into the NIC ring */
u_int n;
u_int const lim = kring->nkr_num_slots - 1;
u_int const head = kring->rhead;
int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR;
/* device-specific */
struct rl_softc *sc = ifp->if_softc;
struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc;
if (head > lim)
return netmap_ring_reinit(kring);
bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
sc->rl_ldata.rl_rx_list_map,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
/*
* First part: import newly received packets.
*
* This device uses all the buffers in the ring, so we need
* another termination condition in addition to RL_RDESC_STAT_OWN
* cleared (all buffers could have it cleared). The easiest one
* is to stop right before nm_hwcur.
*/
if (netmap_no_pendintr || force_update) {
uint16_t slot_flags = kring->nkr_slot_flags;
uint32_t stop_i = nm_prev(kring->nr_hwcur, lim);
nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */
nm_i = netmap_idx_n2k(kring, nic_i);
while (nm_i != stop_i) {
struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i];
uint32_t rxstat = le32toh(cur_rx->rl_cmdstat);
uint32_t total_len;
if ((rxstat & RL_RDESC_STAT_OWN) != 0)
break;
total_len = rxstat & sc->rl_rxlenmask;
/* XXX subtract crc */
total_len = (total_len < 4) ? 0 : total_len - 4;
ring->slot[nm_i].len = total_len;
ring->slot[nm_i].flags = slot_flags;
/* sync was in re_newbuf() */
bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD);
// if_inc_counter(sc->rl_ifp, IFCOUNTER_IPACKETS, 1);
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
sc->rl_ldata.rl_rx_prodidx = nic_i;
kring->nr_hwtail = nm_i;
kring->nr_kflags &= ~NKR_PENDINTR;
}
/*
* Second part: skip past packets that userspace has released.
*/
nm_i = kring->nr_hwcur;
if (nm_i != head) {
nic_i = netmap_idx_k2n(kring, nm_i);
for (n = 0; nm_i != head; n++) {
struct netmap_slot *slot = &ring->slot[nm_i];
uint64_t paddr;
void *addr = PNMB(na, slot, &paddr);
struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i];
int cmd = NETMAP_BUF_SIZE(na) | RL_RDESC_CMD_OWN;
if (addr == NETMAP_BUF_BASE(na)) /* bad buf */
goto ring_reset;
if (nic_i == lim) /* mark end of ring */
cmd |= RL_RDESC_CMD_EOR;
if (slot->flags & NS_BUF_CHANGED) {
/* buffer has changed, reload map */
desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
rxd[nic_i].rx_dmamap, addr);
slot->flags &= ~NS_BUF_CHANGED;
}
desc->rl_cmdstat = htole32(cmd);
bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
rxd[nic_i].rx_dmamap,
BUS_DMASYNC_PREREAD);
nm_i = nm_next(nm_i, lim);
nic_i = nm_next(nic_i, lim);
}
kring->nr_hwcur = head;
bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag,
sc->rl_ldata.rl_rx_list_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}
return 0;
ring_reset:
return netmap_ring_reinit(kring);
}
/*
* Additional routines to init the tx and rx rings.
* In other drivers we do that inline in the main code.
*/
static void
re_netmap_tx_init(struct rl_softc *sc)
{
struct rl_txdesc *txd;
struct rl_desc *desc;
int i, n;
struct netmap_adapter *na = NA(sc->rl_ifp);
struct netmap_slot *slot;
slot = netmap_reset(na, NR_TX, 0, 0);
/* slot is NULL if we are not in native netmap mode */
if (!slot)
return;
/* in netmap mode, overwrite addresses and maps */
txd = sc->rl_ldata.rl_tx_desc;
desc = sc->rl_ldata.rl_tx_list;
n = sc->rl_ldata.rl_tx_desc_cnt;
/* l points in the netmap ring, i points in the NIC ring */
for (i = 0; i < n; i++) {
uint64_t paddr;
int l = netmap_idx_n2k(&na->tx_rings[0], i);
void *addr = PNMB(na, slot + l, &paddr);
desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
netmap_load_map(na, sc->rl_ldata.rl_tx_mtag,
txd[i].tx_dmamap, addr);
}
}
static void
re_netmap_rx_init(struct rl_softc *sc)
{
struct netmap_adapter *na = NA(sc->rl_ifp);
struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0);
struct rl_desc *desc = sc->rl_ldata.rl_rx_list;
uint32_t cmdstat;
uint32_t nic_i, max_avail;
uint32_t const n = sc->rl_ldata.rl_rx_desc_cnt;
if (!slot)
return;
/*
* Do not release the slots owned by userspace,
* and also keep one empty.
*/
max_avail = n - 1 - nm_kr_rxspace(&na->rx_rings[0]);
for (nic_i = 0; nic_i < n; nic_i++) {
void *addr;
uint64_t paddr;
uint32_t nm_i = netmap_idx_n2k(&na->rx_rings[0], nic_i);
addr = PNMB(na, slot + nm_i, &paddr);
netmap_reload_map(na, sc->rl_ldata.rl_rx_mtag,
sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, addr);
bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag,
sc->rl_ldata.rl_rx_desc[nic_i].rx_dmamap, BUS_DMASYNC_PREREAD);
desc[nic_i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr));
desc[nic_i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr));
cmdstat = NETMAP_BUF_SIZE(na);
if (nic_i == n - 1) /* mark the end of ring */
cmdstat |= RL_RDESC_CMD_EOR;
if (nic_i < max_avail)
cmdstat |= RL_RDESC_CMD_OWN;
desc[nic_i].rl_cmdstat = htole32(cmdstat);
}
}
static void
re_netmap_attach(struct rl_softc *sc)
{
struct netmap_adapter na;
bzero(&na, sizeof(na));
na.ifp = sc->rl_ifp;
na.na_flags = NAF_BDG_MAYSLEEP;
na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt;
na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt;
na.nm_txsync = re_netmap_txsync;
na.nm_rxsync = re_netmap_rxsync;
na.nm_register = re_netmap_reg;
na.num_tx_rings = na.num_rx_rings = 1;
netmap_attach(&na);
}
/* end of file */
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