m_megapullup(PNATState pData, struct mbuf *m, int len)
#endif
{
struct mbuf *mcl;
if (len > m->m_pkthdr.len)
goto bad;
/* Do not reallocate packet if it is sequentional,
* writable and has some extra space for expansion.
* XXX: Constant 100bytes is completely empirical. */
#define RESERVE 100
if (m->m_next == NULL && M_WRITABLE(m) && M_TRAILINGSPACE(m) >= RESERVE)
return (m);
if (len <= MCLBYTES - RESERVE) {
#ifndef VBOX
mcl = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
#else
mcl = m_getcl(pData, M_DONTWAIT, MT_DATA, M_PKTHDR);
#endif
} else if (len < MJUM16BYTES) {
int size;
if (len <= MJUMPAGESIZE - RESERVE) {
size = MJUMPAGESIZE;
} else if (len <= MJUM9BYTES - RESERVE) {
size = MJUM9BYTES;
} else {
size = MJUM16BYTES;
};
#ifndef VBOX
mcl = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, size);
#else
mcl = m_getjcl(pData, M_DONTWAIT, MT_DATA, M_PKTHDR, size);
#endif
} else {
goto bad;
}
if (mcl == NULL)
goto bad;
m_move_pkthdr(mcl, m);
m_copydata(m, 0, len, mtod(mcl, caddr_t));
mcl->m_len = mcl->m_pkthdr.len = len;
#ifndef VBOX
m_freem(m);
#else
m_freem(pData, m);
#endif
return (mcl);
bad:
#ifndef VBOX
m_freem(m);
#else
m_freem(pData, m);
#endif
return (NULL);
}
/*
* Re-align the payload in the mbuf. This is mainly used (right now)
* to handle IP header alignment requirements on certain architectures.
*/
struct mbuf *
ieee80211_realign(struct ieee80211vap *vap, struct mbuf *m, size_t align)
{
int pktlen, space;
struct mbuf *n;
pktlen = m->m_pkthdr.len;
space = pktlen + align;
if (space < MINCLSIZE)
n = m_gethdr(M_NOWAIT, MT_DATA);
else {
n = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
space <= MCLBYTES ? MCLBYTES :
#if MJUMPAGESIZE != MCLBYTES
space <= MJUMPAGESIZE ? MJUMPAGESIZE :
#endif
space <= MJUM9BYTES ? MJUM9BYTES : MJUM16BYTES);
}
if (__predict_true(n != NULL)) {
m_move_pkthdr(n, m);
n->m_data = (caddr_t)(ALIGN(n->m_data + align) - align);
m_copydata(m, 0, pktlen, mtod(n, caddr_t));
n->m_len = pktlen;
} else {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
mtod(m, const struct ieee80211_frame *), NULL,
"%s", "no mbuf to realign");
vap->iv_stats.is_rx_badalign++;
}
m_freem(m);
return n;
}
/*
* Allocate a given length worth of mbufs and/or clusters (whatever fits
* best) and return a pointer to the top of the allocated chain. If an
* existing mbuf chain is provided, then we will append the new chain
* to the existing one but still return the top of the newly allocated
* chain.
*/
struct mbuf *
m_getm2(struct mbuf *m, int len, int how, short type, int flags)
{
struct mbuf *mb, *nm = NULL, *mtail = NULL;
KASSERT(len >= 0, ("%s: len is < 0", __func__));
/* Validate flags. */
flags &= (M_PKTHDR | M_EOR);
/* Packet header mbuf must be first in chain. */
if ((flags & M_PKTHDR) && m != NULL)
flags &= ~M_PKTHDR;
/* Loop and append maximum sized mbufs to the chain tail. */
while (len > 0) {
if (len > MCLBYTES)
mb = m_getjcl(how, type, (flags & M_PKTHDR),
MJUMPAGESIZE);
else if (len >= MINCLSIZE)
mb = m_getcl(how, type, (flags & M_PKTHDR));
else if (flags & M_PKTHDR)
mb = m_gethdr(how, type);
else
mb = m_get(how, type);
/* Fail the whole operation if one mbuf can't be allocated. */
if (mb == NULL) {
if (nm != NULL)
m_freem(nm);
return (NULL);
}
/* Book keeping. */
len -= M_SIZE(mb);
if (mtail != NULL)
mtail->m_next = mb;
else
nm = mb;
mtail = mb;
flags &= ~M_PKTHDR; /* Only valid on the first mbuf. */
}
if (flags & M_EOR)
mtail->m_flags |= M_EOR; /* Only valid on the last mbuf. */
/* If mbuf was supplied, append new chain to the end of it. */
if (m != NULL) {
for (mtail = m; mtail->m_next != NULL; mtail = mtail->m_next)
;
mtail->m_next = nm;
mtail->m_flags &= ~M_EOR;
} else
m = nm;
return (m);
}
static int mlx4_en_alloc_buf(struct mlx4_en_priv *priv,
struct mlx4_en_rx_desc *rx_desc,
struct mbuf **mb_list,
int i)
{
struct mlx4_en_dev *mdev = priv->mdev;
struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
struct mbuf *mb;
dma_addr_t dma;
if (i == 0)
mb = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, frag_info->frag_size);
else
mb = m_getjcl(M_NOWAIT, MT_DATA, 0, frag_info->frag_size);
if (mb == NULL) {
priv->port_stats.rx_alloc_failed++;
return -ENOMEM;
}
dma = pci_map_single(mdev->pdev, mb->m_data, frag_info->frag_size,
PCI_DMA_FROMDEVICE);
rx_desc->data[i].addr = cpu_to_be64(dma);
mb_list[i] = mb;
return 0;
}
static void
usie_if_rx_callback(struct usb_xfer *xfer, usb_error_t error)
{
struct usie_softc *sc = usbd_xfer_softc(xfer);
struct ifnet *ifp = sc->sc_ifp;
struct mbuf *m0;
struct mbuf *m = NULL;
struct usie_desc *rxd;
uint32_t actlen;
uint16_t err;
uint16_t pkt;
uint16_t ipl;
uint16_t len;
uint16_t diff;
uint8_t pad;
uint8_t ipv;
usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
switch (USB_GET_STATE(xfer)) {
case USB_ST_TRANSFERRED:
DPRINTFN(15, "rx done, actlen=%u\n", actlen);
if (actlen < sizeof(struct usie_hip)) {
DPRINTF("data too short %u\n", actlen);
goto tr_setup;
}
m = sc->sc_rxm;
sc->sc_rxm = NULL;
/* fall though */
case USB_ST_SETUP:
tr_setup:
if (sc->sc_rxm == NULL) {
sc->sc_rxm = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR,
MJUMPAGESIZE /* could be bigger than MCLBYTES */ );
}
if (sc->sc_rxm == NULL) {
DPRINTF("could not allocate Rx mbuf\n");
ifp->if_ierrors++;
usbd_xfer_set_stall(xfer);
usbd_xfer_set_frames(xfer, 0);
} else {
/*
* Directly loading a mbuf cluster into DMA to
* save some data copying. This works because
* there is only one cluster.
*/
usbd_xfer_set_frame_data(xfer, 0,
mtod(sc->sc_rxm, caddr_t), MIN(MJUMPAGESIZE, USIE_RXSZ_MAX));
usbd_xfer_set_frames(xfer, 1);
}
usbd_transfer_submit(xfer);
break;
default: /* Error */
DPRINTF("USB transfer error, %s\n", usbd_errstr(error));
if (error != USB_ERR_CANCELLED) {
/* try to clear stall first */
usbd_xfer_set_stall(xfer);
ifp->if_ierrors++;
goto tr_setup;
}
if (sc->sc_rxm != NULL) {
m_freem(sc->sc_rxm);
sc->sc_rxm = NULL;
}
break;
}
if (m == NULL)
return;
mtx_unlock(&sc->sc_mtx);
m->m_pkthdr.len = m->m_len = actlen;
err = pkt = 0;
/* HW can aggregate multiple frames in a single USB xfer */
for (;;) {
rxd = mtod(m, struct usie_desc *);
len = be16toh(rxd->hip.len) & USIE_HIP_IP_LEN_MASK;
pad = (rxd->hip.id & USIE_HIP_PAD) ? 1 : 0;
ipl = (len - pad - ETHER_HDR_LEN);
if (ipl >= len) {
DPRINTF("Corrupt frame\n");
m_freem(m);
break;
}
diff = sizeof(struct usie_desc) + ipl + pad;
if (((rxd->hip.id & USIE_HIP_MASK) != USIE_HIP_IP) ||
(be16toh(rxd->desc_type) & USIE_TYPE_MASK) != USIE_IP_RX) {
DPRINTF("received wrong type of packet\n");
m->m_data += diff;
m->m_pkthdr.len = (m->m_len -= diff);
err++;
if (m->m_pkthdr.len > 0)
continue;
m_freem(m);
break;
}
switch (be16toh(rxd->ethhdr.ether_type)) {
case ETHERTYPE_IP:
ipv = NETISR_IP;
break;
#ifdef INET6
case ETHERTYPE_IPV6:
ipv = NETISR_IPV6;
break;
#endif
default:
DPRINTF("unsupported ether type\n");
err++;
break;
}
/* the last packet */
if (m->m_pkthdr.len <= diff) {
m->m_data += (sizeof(struct usie_desc) + pad);
m->m_pkthdr.len = m->m_len = ipl;
m->m_pkthdr.rcvif = ifp;
BPF_MTAP(sc->sc_ifp, m);
netisr_dispatch(ipv, m);
break;
}
/* copy aggregated frames to another mbuf */
m0 = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (__predict_false(m0 == NULL)) {
DPRINTF("could not allocate mbuf\n");
err++;
m_freem(m);
break;
}
m_copydata(m, sizeof(struct usie_desc) + pad, ipl, mtod(m0, caddr_t));
m0->m_pkthdr.rcvif = ifp;
m0->m_pkthdr.len = m0->m_len = ipl;
BPF_MTAP(sc->sc_ifp, m0);
netisr_dispatch(ipv, m0);
m->m_data += diff;
m->m_pkthdr.len = (m->m_len -= diff);
}
mtx_lock(&sc->sc_mtx);
ifp->if_ierrors += err;
ifp->if_ipackets += pkt;
}
/*
* Send a command to the firmware. We try to implement the Linux
* driver interface for the routine.
* mostly from if_iwn (iwn_cmd()).
*
* For now, we always copy the first part and map the second one (if it exists).
*/
int
iwm_send_cmd(struct iwm_softc *sc, struct iwm_host_cmd *hcmd)
{
struct iwm_tx_ring *ring = &sc->txq[IWM_MVM_CMD_QUEUE];
struct iwm_tfd *desc;
struct iwm_tx_data *txdata = NULL;
struct iwm_device_cmd *cmd;
struct mbuf *m;
bus_dma_segment_t seg;
bus_addr_t paddr;
uint32_t addr_lo;
int error = 0, i, paylen, off;
int code;
int async, wantresp;
int group_id;
int nsegs;
size_t hdrlen, datasz;
uint8_t *data;
code = hcmd->id;
async = hcmd->flags & IWM_CMD_ASYNC;
wantresp = hcmd->flags & IWM_CMD_WANT_SKB;
data = NULL;
for (i = 0, paylen = 0; i < nitems(hcmd->len); i++) {
paylen += hcmd->len[i];
}
/* if the command wants an answer, busy sc_cmd_resp */
if (wantresp) {
KASSERT(!async, ("invalid async parameter"));
while (sc->sc_wantresp != -1)
msleep(&sc->sc_wantresp, &sc->sc_mtx, 0, "iwmcmdsl", 0);
sc->sc_wantresp = ring->qid << 16 | ring->cur;
IWM_DPRINTF(sc, IWM_DEBUG_CMD,
"wantresp is %x\n", sc->sc_wantresp);
}
/*
* Is the hardware still available? (after e.g. above wait).
*/
if (sc->sc_flags & IWM_FLAG_STOPPED) {
error = ENXIO;
goto out;
}
desc = &ring->desc[ring->cur];
txdata = &ring->data[ring->cur];
group_id = iwm_cmd_groupid(code);
if (group_id != 0) {
hdrlen = sizeof(cmd->hdr_wide);
datasz = sizeof(cmd->data_wide);
} else {
hdrlen = sizeof(cmd->hdr);
datasz = sizeof(cmd->data);
}
if (paylen > datasz) {
size_t totlen;
IWM_DPRINTF(sc, IWM_DEBUG_CMD,
"large command paylen=%u len0=%u\n",
paylen, hcmd->len[0]);
/* Command is too large */
totlen = hdrlen + paylen;
if (paylen > IWM_MAX_CMD_PAYLOAD_SIZE) {
device_printf(sc->sc_dev,
"firmware command too long (%zd bytes)\n",
totlen);
error = EINVAL;
goto out;
}
m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, IWM_RBUF_SIZE);
if (m == NULL) {
error = ENOBUFS;
goto out;
}
m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
error = bus_dmamap_load_mbuf_sg(ring->data_dmat,
txdata->map, m, &seg, &nsegs, BUS_DMA_NOWAIT);
if (error != 0) {
device_printf(sc->sc_dev,
"%s: can't map mbuf, error %d\n", __func__, error);
m_freem(m);
goto out;
}
txdata->m = m; /* mbuf will be freed in iwm_cmd_done() */
cmd = mtod(m, struct iwm_device_cmd *);
paddr = seg.ds_addr;
} else {
static int
rtwn_pci_alloc_rx_list(struct rtwn_softc *sc)
{
struct rtwn_pci_softc *pc = RTWN_PCI_SOFTC(sc);
struct rtwn_rx_ring *rx_ring = &pc->rx_ring;
struct rtwn_rx_data *rx_data;
bus_size_t size;
int i, error;
/* Allocate Rx descriptors. */
size = sizeof(struct r92ce_rx_stat) * RTWN_PCI_RX_LIST_COUNT;
error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 1, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
size, 1, size, 0, NULL, NULL, &rx_ring->desc_dmat);
if (error != 0) {
device_printf(sc->sc_dev, "could not create rx desc DMA tag\n");
goto fail;
}
error = bus_dmamem_alloc(rx_ring->desc_dmat, (void **)&rx_ring->desc,
BUS_DMA_NOWAIT | BUS_DMA_ZERO | BUS_DMA_COHERENT,
&rx_ring->desc_map);
if (error != 0) {
device_printf(sc->sc_dev, "could not allocate rx desc\n");
goto fail;
}
error = bus_dmamap_load(rx_ring->desc_dmat, rx_ring->desc_map,
rx_ring->desc, size, rtwn_pci_dma_map_addr, &rx_ring->paddr, 0);
if (error != 0) {
device_printf(sc->sc_dev, "could not load rx desc DMA map\n");
goto fail;
}
bus_dmamap_sync(rx_ring->desc_dmat, rx_ring->desc_map,
BUS_DMASYNC_PREWRITE);
/* Create RX buffer DMA tag. */
error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 1, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
MJUMPAGESIZE, 1, MJUMPAGESIZE, 0, NULL, NULL, &rx_ring->data_dmat);
if (error != 0) {
device_printf(sc->sc_dev, "could not create rx buf DMA tag\n");
goto fail;
}
/* Allocate Rx buffers. */
for (i = 0; i < RTWN_PCI_RX_LIST_COUNT; i++) {
rx_data = &rx_ring->rx_data[i];
error = bus_dmamap_create(rx_ring->data_dmat, 0, &rx_data->map);
if (error != 0) {
device_printf(sc->sc_dev,
"could not create rx buf DMA map\n");
goto fail;
}
rx_data->m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
MJUMPAGESIZE);
if (rx_data->m == NULL) {
device_printf(sc->sc_dev,
"could not allocate rx mbuf\n");
error = ENOMEM;
goto fail;
}
error = bus_dmamap_load(rx_ring->data_dmat, rx_data->map,
mtod(rx_data->m, void *), MJUMPAGESIZE,
rtwn_pci_dma_map_addr, &rx_data->paddr, BUS_DMA_NOWAIT);
if (error != 0) {
device_printf(sc->sc_dev,
"could not load rx buf DMA map");
goto fail;
}
rtwn_pci_setup_rx_desc(pc, &rx_ring->desc[i], rx_data->paddr,
MJUMPAGESIZE, i);
}
rx_ring->cur = 0;
return (0);
fail:
rtwn_pci_free_rx_list(sc);
return (error);
}
static void
sfxge_rx_qfill(struct sfxge_rxq *rxq, unsigned int target, boolean_t retrying)
{
struct sfxge_softc *sc;
unsigned int index;
struct sfxge_evq *evq;
unsigned int batch;
unsigned int rxfill;
unsigned int mblksize;
int ntodo;
efsys_dma_addr_t addr[SFXGE_REFILL_BATCH];
sc = rxq->sc;
index = rxq->index;
evq = sc->evq[index];
prefetch_read_many(sc->enp);
prefetch_read_many(rxq->common);
SFXGE_EVQ_LOCK_ASSERT_OWNED(evq);
if (__predict_false(rxq->init_state != SFXGE_RXQ_STARTED))
return;
rxfill = rxq->added - rxq->completed;
KASSERT(rxfill <= EFX_RXQ_LIMIT(rxq->entries),
("rxfill > EFX_RXQ_LIMIT(rxq->entries)"));
ntodo = min(EFX_RXQ_LIMIT(rxq->entries) - rxfill, target);
KASSERT(ntodo <= EFX_RXQ_LIMIT(rxq->entries),
("ntodo > EFX_RQX_LIMIT(rxq->entries)"));
if (ntodo == 0)
return;
batch = 0;
mblksize = sc->rx_buffer_size - sc->rx_buffer_align;
while (ntodo-- > 0) {
unsigned int id;
struct sfxge_rx_sw_desc *rx_desc;
bus_dma_segment_t seg;
struct mbuf *m;
id = (rxq->added + batch) & rxq->ptr_mask;
rx_desc = &rxq->queue[id];
KASSERT(rx_desc->mbuf == NULL, ("rx_desc->mbuf != NULL"));
rx_desc->flags = EFX_DISCARD;
m = rx_desc->mbuf = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
sc->rx_cluster_size);
if (m == NULL)
break;
/* m_len specifies length of area to be mapped for DMA */
m->m_len = mblksize;
m->m_data = (caddr_t)P2ROUNDUP((uintptr_t)m->m_data, CACHE_LINE_SIZE);
m->m_data += sc->rx_buffer_align;
sfxge_map_mbuf_fast(rxq->mem.esm_tag, rxq->mem.esm_map, m, &seg);
addr[batch++] = seg.ds_addr;
if (batch == SFXGE_REFILL_BATCH) {
efx_rx_qpost(rxq->common, addr, mblksize, batch,
rxq->completed, rxq->added);
rxq->added += batch;
batch = 0;
}
}
if (ntodo != 0)
sfxge_rx_schedule_refill(rxq, retrying);
if (batch != 0) {
efx_rx_qpost(rxq->common, addr, mblksize, batch,
rxq->completed, rxq->added);
rxq->added += batch;
}
/* Make the descriptors visible to the hardware */
bus_dmamap_sync(rxq->mem.esm_tag, rxq->mem.esm_map,
BUS_DMASYNC_PREWRITE);
efx_rx_qpush(rxq->common, rxq->added, &rxq->pushed);
/* The queue could still be empty if no descriptors were actually
* pushed, in which case there will be no event to cause the next
* refill, so we must schedule a refill ourselves.
*/
if(rxq->pushed == rxq->completed) {
sfxge_rx_schedule_refill(rxq, retrying);
}
}
/*
* Tcp output routine: figure out what should be sent and send it.
*/
int
tcp_output(PNATState pData, register struct tcpcb *tp)
{
register struct socket *so = tp->t_socket;
register long len, win;
int off, flags, error;
register struct mbuf *m = NULL;
register struct tcpiphdr *ti;
u_char opt[MAX_TCPOPTLEN];
unsigned optlen, hdrlen;
int idle, sendalot;
int size = 0;
LogFlowFunc(("ENTER: tcp_output: tp = %R[tcpcb793]\n", tp));
/*
* Determine length of data that should be transmitted,
* and flags that will be used.
* If there is some data or critical controls (SYN, RST)
* to send, then transmit; otherwise, investigate further.
*/
idle = (tp->snd_max == tp->snd_una);
if (idle && tp->t_idle >= tp->t_rxtcur)
/*
* We have been idle for "a while" and no acks are
* expected to clock out any data we send --
* slow start to get ack "clock" running again.
*/
tp->snd_cwnd = tp->t_maxseg;
again:
sendalot = 0;
off = tp->snd_nxt - tp->snd_una;
win = min(tp->snd_wnd, tp->snd_cwnd);
flags = tcp_outflags[tp->t_state];
Log2((" --- tcp_output flags = 0x%x\n", flags));
/*
* If in persist timeout with window of 0, send 1 byte.
* Otherwise, if window is small but nonzero
* and timer expired, we will send what we can
* and go to transmit state.
*/
if (tp->t_force)
{
if (win == 0)
{
/*
* If we still have some data to send, then
* clear the FIN bit. Usually this would
* happen below when it realizes that we
* aren't sending all the data. However,
* if we have exactly 1 byte of unset data,
* then it won't clear the FIN bit below,
* and if we are in persist state, we wind
* up sending the packet without recording
* that we sent the FIN bit.
*
* We can't just blindly clear the FIN bit,
* because if we don't have any more data
* to send then the probe will be the FIN
* itself.
*/
if (off < SBUF_LEN(&so->so_snd))
flags &= ~TH_FIN;
win = 1;
}
else
{
tp->t_timer[TCPT_PERSIST] = 0;
tp->t_rxtshift = 0;
}
}
len = min(SBUF_LEN(&so->so_snd), win) - off;
if (len < 0)
{
/*
* If FIN has been sent but not acked,
* but we haven't been called to retransmit,
* len will be -1. Otherwise, window shrank
* after we sent into it. If window shrank to 0,
* cancel pending retransmit and pull snd_nxt
* back to (closed) window. We will enter persist
* state below. If the window didn't close completely,
* just wait for an ACK.
*/
len = 0;
if (win == 0)
{
tp->t_timer[TCPT_REXMT] = 0;
tp->snd_nxt = tp->snd_una;
}
}
if (len > tp->t_maxseg)
{
len = tp->t_maxseg;
sendalot = 1;
}
if (SEQ_LT(tp->snd_nxt + len, tp->snd_una + SBUF_LEN(&so->so_snd)))
flags &= ~TH_FIN;
win = sbspace(&so->so_rcv);
/*
* Sender silly window avoidance. If connection is idle
* and can send all data, a maximum segment,
* at least a maximum default-size segment do it,
* or are forced, do it; otherwise don't bother.
* If peer's buffer is tiny, then send
* when window is at least half open.
* If retransmitting (possibly after persist timer forced us
* to send into a small window), then must resend.
*/
if (len)
{
if (len == tp->t_maxseg)
goto send;
if ((1 || idle || tp->t_flags & TF_NODELAY) &&
len + off >= SBUF_LEN(&so->so_snd))
goto send;
if (tp->t_force)
goto send;
if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0)
goto send;
if (SEQ_LT(tp->snd_nxt, tp->snd_max))
goto send;
}
/*
* Compare available window to amount of window
* known to peer (as advertised window less
* next expected input). If the difference is at least two
* max size segments, or at least 50% of the maximum possible
* window, then want to send a window update to peer.
*/
if (win > 0)
{
/*
* "adv" is the amount we can increase the window,
* taking into account that we are limited by
* TCP_MAXWIN << tp->rcv_scale.
*/
long adv = min(win, (long)TCP_MAXWIN << tp->rcv_scale);
if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt))
adv -= tp->rcv_adv - tp->rcv_nxt;
if (adv >= (long) (2 * tp->t_maxseg))
goto send;
if (2 * adv >= (long) SBUF_SIZE(&so->so_rcv))
goto send;
}
/*
* Send if we owe peer an ACK.
*/
if (tp->t_flags & TF_ACKNOW)
goto send;
if (flags & (TH_SYN|TH_RST))
goto send;
if (SEQ_GT(tp->snd_up, tp->snd_una))
goto send;
/*
* If our state indicates that FIN should be sent
* and we have not yet done so, or we're retransmitting the FIN,
* then we need to send.
*/
if ( flags & TH_FIN
&& ((tp->t_flags & TF_SENTFIN) == 0 || tp->snd_nxt == tp->snd_una))
goto send;
/*
* TCP window updates are not reliable, rather a polling protocol
* using ``persist'' packets is used to insure receipt of window
* updates. The three ``states'' for the output side are:
* idle not doing retransmits or persists
* persisting to move a small or zero window
* (re)transmitting and thereby not persisting
*
* tp->t_timer[TCPT_PERSIST]
* is set when we are in persist state.
* tp->t_force
* is set when we are called to send a persist packet.
* tp->t_timer[TCPT_REXMT]
* is set when we are retransmitting
* The output side is idle when both timers are zero.
*
* If send window is too small, there is data to transmit, and no
* retransmit or persist is pending, then go to persist state.
* If nothing happens soon, send when timer expires:
* if window is nonzero, transmit what we can,
* otherwise force out a byte.
*/
if ( SBUF_LEN(&so->so_snd)
&& tp->t_timer[TCPT_REXMT] == 0
&& tp->t_timer[TCPT_PERSIST] == 0)
{
tp->t_rxtshift = 0;
tcp_setpersist(tp);
}
/*
* No reason to send a segment, just return.
*/
tcpstat.tcps_didnuttin++;
LogFlowFuncLeave();
return (0);
send:
LogFlowFunc(("send\n"));
/*
* Before ESTABLISHED, force sending of initial options
* unless TCP set not to do any options.
* NOTE: we assume that the IP/TCP header plus TCP options
* always fit in a single mbuf, leaving room for a maximum
* link header, i.e.
* max_linkhdr + sizeof (struct tcpiphdr) + optlen <= MHLEN
*/
optlen = 0;
hdrlen = sizeof (struct tcpiphdr);
if (flags & TH_SYN)
{
tp->snd_nxt = tp->iss;
if ((tp->t_flags & TF_NOOPT) == 0)
{
u_int16_t mss;
opt[0] = TCPOPT_MAXSEG;
opt[1] = 4;
mss = RT_H2N_U16((u_int16_t) tcp_mss(pData, tp, 0));
memcpy((caddr_t)(opt + 2), (caddr_t)&mss, sizeof(mss));
optlen = 4;
#if 0
if ( (tp->t_flags & TF_REQ_SCALE)
&& ( (flags & TH_ACK) == 0
|| (tp->t_flags & TF_RCVD_SCALE)))
{
*((u_int32_t *) (opt + optlen)) = RT_H2N_U32( TCPOPT_NOP << 24
| TCPOPT_WINDOW << 16
| TCPOLEN_WINDOW << 8
| tp->request_r_scale);
optlen += 4;
}
#endif
}
}
/*
* Send a timestamp and echo-reply if this is a SYN and our side
* wants to use timestamps (TF_REQ_TSTMP is set) or both our side
* and our peer have sent timestamps in our SYN's.
*/
#if 0
if ( (tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP
&& (flags & TH_RST) == 0
&& ( (flags & (TH_SYN|TH_ACK)) == TH_SYN
|| (tp->t_flags & TF_RCVD_TSTMP)))
{
u_int32_t *lp = (u_int32_t *)(opt + optlen);
/* Form timestamp option as shown in appendix A of RFC 1323. */
*lp++ = RT_H2N_U32_C(TCPOPT_TSTAMP_HDR);
*lp++ = RT_H2N_U32(tcp_now);
*lp = RT_H2N_U32(tp->ts_recent);
optlen += TCPOLEN_TSTAMP_APPA;
}
#endif
hdrlen += optlen;
/*
* Adjust data length if insertion of options will
* bump the packet length beyond the t_maxseg length.
*/
if (len > tp->t_maxseg - optlen)
{
len = tp->t_maxseg - optlen;
sendalot = 1;
}
/*
* Grab a header mbuf, attaching a copy of data to
* be transmitted, and initialize the header from
* the template for sends on this connection.
*/
if (len)
{
if (tp->t_force && len == 1)
tcpstat.tcps_sndprobe++;
else if (SEQ_LT(tp->snd_nxt, tp->snd_max))
{
tcpstat.tcps_sndrexmitpack++;
tcpstat.tcps_sndrexmitbyte += len;
}
else
{
tcpstat.tcps_sndpack++;
tcpstat.tcps_sndbyte += len;
}
size = MCLBYTES;
if ((len + hdrlen + ETH_HLEN) < MSIZE)
size = MCLBYTES;
else if ((len + hdrlen + ETH_HLEN) < MCLBYTES)
size = MCLBYTES;
else if((len + hdrlen + ETH_HLEN) < MJUM9BYTES)
size = MJUM9BYTES;
else if ((len + hdrlen + ETH_HLEN) < MJUM16BYTES)
size = MJUM16BYTES;
else
AssertMsgFailed(("Unsupported size"));
m = m_getjcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR, size);
if (m == NULL)
{
/* error = ENOBUFS; */
error = 1;
goto out;
}
m->m_data += if_maxlinkhdr;
m->m_pkthdr.header = mtod(m, void *);
m->m_len = hdrlen;
/*
* This will always succeed, since we make sure our mbufs
* are big enough to hold one MSS packet + header + ... etc.
*/
#if 0
if (len <= MHLEN - hdrlen - max_linkhdr)
{
#endif
sbcopy(&so->so_snd, off, (int) len, mtod(m, caddr_t) + hdrlen);
m->m_len += len;
#if 0
}
else
{
m->m_next = m_copy(so->so_snd.sb_mb, off, (int) len);
if (m->m_next == 0)
len = 0;
}
#endif
/*
* If we're sending everything we've got, set PUSH.
* (This will keep happy those implementations which only
* give data to the user when a buffer fills or
* a PUSH comes in.)
*/
if (off + len == SBUF_LEN(&so->so_snd))
flags |= TH_PUSH;
}
else
{
static int
mlx4_en_alloc_buf(struct mlx4_en_rx_ring *ring,
__be64 *pdma, struct mlx4_en_rx_mbuf *mb_list)
{
bus_dma_segment_t segs[1];
bus_dmamap_t map;
struct mbuf *mb;
int nsegs;
int err;
/* try to allocate a new spare mbuf */
if (unlikely(ring->spare.mbuf == NULL)) {
mb = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, ring->rx_mb_size);
if (unlikely(mb == NULL))
return (-ENOMEM);
/* setup correct length */
mb->m_pkthdr.len = mb->m_len = ring->rx_mb_size;
/* make sure IP header gets aligned */
m_adj(mb, MLX4_NET_IP_ALIGN);
/* load spare mbuf into BUSDMA */
err = -bus_dmamap_load_mbuf_sg(ring->dma_tag, ring->spare.dma_map,
mb, segs, &nsegs, BUS_DMA_NOWAIT);
if (unlikely(err != 0)) {
m_freem(mb);
return (err);
}
/* store spare info */
ring->spare.mbuf = mb;
ring->spare.paddr_be = cpu_to_be64(segs[0].ds_addr);
bus_dmamap_sync(ring->dma_tag, ring->spare.dma_map,
BUS_DMASYNC_PREREAD);
}
/* synchronize and unload the current mbuf, if any */
if (likely(mb_list->mbuf != NULL)) {
bus_dmamap_sync(ring->dma_tag, mb_list->dma_map,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(ring->dma_tag, mb_list->dma_map);
}
mb = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, ring->rx_mb_size);
if (unlikely(mb == NULL))
goto use_spare;
/* setup correct length */
mb->m_pkthdr.len = mb->m_len = ring->rx_mb_size;
/* make sure IP header gets aligned */
m_adj(mb, MLX4_NET_IP_ALIGN);
err = -bus_dmamap_load_mbuf_sg(ring->dma_tag, mb_list->dma_map,
mb, segs, &nsegs, BUS_DMA_NOWAIT);
if (unlikely(err != 0)) {
m_freem(mb);
goto use_spare;
}
*pdma = cpu_to_be64(segs[0].ds_addr);
mb_list->mbuf = mb;
bus_dmamap_sync(ring->dma_tag, mb_list->dma_map, BUS_DMASYNC_PREREAD);
return (0);
use_spare:
/* swap DMA maps */
map = mb_list->dma_map;
mb_list->dma_map = ring->spare.dma_map;
ring->spare.dma_map = map;
/* swap MBUFs */
mb_list->mbuf = ring->spare.mbuf;
ring->spare.mbuf = NULL;
/* store physical address */
*pdma = ring->spare.paddr_be;
return (0);
}