374 lines
11 KiB
C
374 lines
11 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
*
|
|
* 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)
|
|
{
|
|
if_t ifp = na->ifp;
|
|
struct rl_softc *adapter = if_getsoftc(ifp);
|
|
|
|
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 (if_getdrvflags(ifp) & 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;
|
|
if_t 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 = if_getsoftc(ifp);
|
|
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;
|
|
if_t 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 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 = if_getsoftc(ifp);
|
|
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) {
|
|
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 = 0;
|
|
/* 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);
|
|
while (nm_i != head) {
|
|
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 */
|