freebsd-dev/sys/dev/netmap/if_re_netmap.h
2014-09-19 03:51:26 +00:00

380 lines
11 KiB
C

/*
* 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);
}
}
nm_txsync_finalize(kring);
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 = nm_rxsync_prologue(kring);
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);
}
/* tell userspace that there might be new packets */
nm_rxsync_finalize(kring);
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 */