| Current Path : /sys/ofed/drivers/infiniband/ulp/sdp/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/ofed/drivers/infiniband/ulp/sdp/sdp_zcopy.c |
/*
* Copyright (c) 2006 Mellanox Technologies Ltd. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/tcp.h>
#include <asm/ioctls.h>
#include <linux/workqueue.h>
#include <linux/net.h>
#include <linux/socket.h>
#include <net/protocol.h>
#include <net/inet_common.h>
#include <rdma/rdma_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_fmr_pool.h>
#include <rdma/ib_umem.h>
#include <net/tcp.h> /* for memcpy_toiovec */
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include "sdp.h"
static int sdp_post_srcavail(struct socket *sk, struct tx_srcavail_state *tx_sa)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct mbuf *mb;
int payload_len;
struct page *payload_pg;
int off, len;
struct ib_umem_chunk *chunk;
WARN_ON(ssk->tx_sa);
BUG_ON(!tx_sa);
BUG_ON(!tx_sa->fmr || !tx_sa->fmr->fmr->lkey);
BUG_ON(!tx_sa->umem);
BUG_ON(!tx_sa->umem->chunk_list.next);
chunk = list_entry(tx_sa->umem->chunk_list.next, struct ib_umem_chunk, list);
BUG_ON(!chunk->nmap);
off = tx_sa->umem->offset;
len = tx_sa->umem->length;
tx_sa->bytes_sent = tx_sa->bytes_acked = 0;
mb = sdp_alloc_mb_srcavail(sk, len, tx_sa->fmr->fmr->lkey, off, 0);
if (!mb) {
return -ENOMEM;
}
sdp_dbg_data(sk, "sending SrcAvail\n");
TX_SRCAVAIL_STATE(mb) = tx_sa; /* tx_sa is hanged on the mb
* but continue to live after mb is freed */
ssk->tx_sa = tx_sa;
/* must have payload inlined in SrcAvail packet in combined mode */
payload_len = MIN(tx_sa->umem->page_size - off, len);
payload_len = MIN(payload_len, ssk->xmit_size_goal - sizeof(struct sdp_srcah));
payload_pg = sg_page(&chunk->page_list[0]);
get_page(payload_pg);
sdp_dbg_data(sk, "payload: off: 0x%x, pg: %p, len: 0x%x\n",
off, payload_pg, payload_len);
mb_fill_page_desc(mb, mb_shinfo(mb)->nr_frags,
payload_pg, off, payload_len);
mb->len += payload_len;
mb->data_len = payload_len;
mb->truesize += payload_len;
// sk->sk_wmem_queued += payload_len;
// sk->sk_forward_alloc -= payload_len;
mb_entail(sk, ssk, mb);
ssk->write_seq += payload_len;
SDP_SKB_CB(mb)->end_seq += payload_len;
tx_sa->bytes_sent = tx_sa->umem->length;
tx_sa->bytes_acked = payload_len;
/* TODO: pushing the mb into the tx_queue should be enough */
return 0;
}
static int sdp_post_srcavail_cancel(struct socket *sk)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct mbuf *mb;
sdp_dbg_data(ssk->socket, "Posting srcavail cancel\n");
mb = sdp_alloc_mb_srcavail_cancel(sk, 0);
mb_entail(sk, ssk, mb);
sdp_post_sends(ssk, 0);
schedule_delayed_work(&ssk->srcavail_cancel_work,
SDP_SRCAVAIL_CANCEL_TIMEOUT);
return 0;
}
void srcavail_cancel_timeout(struct work_struct *work)
{
struct sdp_sock *ssk =
container_of(work, struct sdp_sock, srcavail_cancel_work.work);
struct socket *sk = ssk->socket;
lock_sock(sk);
sdp_dbg_data(sk, "both SrcAvail and SrcAvailCancel timedout."
" closing connection\n");
sdp_set_error(sk, -ECONNRESET);
wake_up(&ssk->wq);
release_sock(sk);
}
static int sdp_wait_rdmardcompl(struct sdp_sock *ssk, long *timeo_p,
int ignore_signals)
{
struct socket *sk = ssk->socket;
int err = 0;
long vm_wait = 0;
long current_timeo = *timeo_p;
struct tx_srcavail_state *tx_sa = ssk->tx_sa;
DEFINE_WAIT(wait);
sdp_dbg_data(sk, "sleep till RdmaRdCompl. timeo = %ld.\n", *timeo_p);
sdp_prf1(sk, NULL, "Going to sleep");
while (ssk->qp_active) {
prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
if (unlikely(!*timeo_p)) {
err = -ETIME;
tx_sa->abort_flags |= TX_SA_TIMEDOUT;
sdp_prf1(sk, NULL, "timeout");
SDPSTATS_COUNTER_INC(zcopy_tx_timeout);
break;
}
else if (tx_sa->bytes_acked > tx_sa->bytes_sent) {
err = -EINVAL;
sdp_dbg_data(sk, "acked bytes > sent bytes\n");
tx_sa->abort_flags |= TX_SA_ERROR;
break;
}
if (tx_sa->abort_flags & TX_SA_SENDSM) {
sdp_prf1(sk, NULL, "Aborting SrcAvail sending");
SDPSTATS_COUNTER_INC(zcopy_tx_aborted);
err = -EAGAIN;
break ;
}
if (!ignore_signals) {
if (signal_pending(current)) {
err = -EINTR;
sdp_prf1(sk, NULL, "signalled");
tx_sa->abort_flags |= TX_SA_INTRRUPTED;
break;
}
if (ssk->rx_sa && (tx_sa->bytes_acked < tx_sa->bytes_sent)) {
sdp_dbg_data(sk, "Crossing SrcAvail - aborting this\n");
tx_sa->abort_flags |= TX_SA_CROSS_SEND;
SDPSTATS_COUNTER_INC(zcopy_cross_send);
err = -ETIME;
break ;
}
}
posts_handler_put(ssk);
sk_wait_event(sk, ¤t_timeo,
tx_sa->abort_flags &&
ssk->rx_sa &&
(tx_sa->bytes_acked < tx_sa->bytes_sent) &&
vm_wait);
sdp_dbg_data(ssk->socket, "woke up sleepers\n");
posts_handler_get(ssk);
if (tx_sa->bytes_acked == tx_sa->bytes_sent)
break;
if (vm_wait) {
vm_wait -= current_timeo;
current_timeo = *timeo_p;
if (current_timeo != MAX_SCHEDULE_TIMEOUT &&
(current_timeo -= vm_wait) < 0)
current_timeo = 0;
vm_wait = 0;
}
*timeo_p = current_timeo;
}
finish_wait(sk->sk_sleep, &wait);
sdp_dbg_data(sk, "Finished waiting - RdmaRdCompl: %d/%d bytes, flags: 0x%x\n",
tx_sa->bytes_acked, tx_sa->bytes_sent, tx_sa->abort_flags);
if (!ssk->qp_active) {
sdp_dbg(sk, "QP destroyed while waiting\n");
return -EINVAL;
}
return err;
}
static void sdp_wait_rdma_wr_finished(struct sdp_sock *ssk)
{
struct socket *sk = ssk->socket;
long timeo = HZ * 5; /* Timeout for for RDMA read */
DEFINE_WAIT(wait);
sdp_dbg_data(sk, "Sleep till RDMA wr finished.\n");
while (1) {
prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE);
if (!ssk->tx_ring.rdma_inflight->busy) {
sdp_dbg_data(sk, "got rdma cqe\n");
break;
}
if (!ssk->qp_active) {
sdp_dbg_data(sk, "QP destroyed\n");
break;
}
if (!timeo) {
sdp_warn(sk, "Panic: Timed out waiting for RDMA read\n");
WARN_ON(1);
break;
}
posts_handler_put(ssk);
sdp_prf1(sk, NULL, "Going to sleep");
sk_wait_event(sk, &timeo,
!ssk->tx_ring.rdma_inflight->busy);
sdp_prf1(sk, NULL, "Woke up");
sdp_dbg_data(ssk->socket, "woke up sleepers\n");
posts_handler_get(ssk);
}
finish_wait(sk->sk_sleep, &wait);
sdp_dbg_data(sk, "Finished waiting\n");
}
int sdp_post_rdma_rd_compl(struct sdp_sock *ssk,
struct rx_srcavail_state *rx_sa)
{
struct mbuf *mb;
int copied = rx_sa->used - rx_sa->reported;
if (rx_sa->used <= rx_sa->reported)
return 0;
mb = sdp_alloc_mb_rdmardcompl(ssk->socket, copied, 0);
rx_sa->reported += copied;
/* TODO: What if no tx_credits available? */
sdp_post_send(ssk, mb);
return 0;
}
int sdp_post_sendsm(struct socket *sk)
{
struct mbuf *mb = sdp_alloc_mb_sendsm(sk, 0);
sdp_post_send(sdp_sk(sk), mb);
return 0;
}
static int sdp_update_iov_used(struct socket *sk, struct iovec *iov, int len)
{
sdp_dbg_data(sk, "updating consumed 0x%x bytes from iov\n", len);
while (len > 0) {
if (iov->iov_len) {
int copy = min_t(unsigned int, iov->iov_len, len);
len -= copy;
iov->iov_len -= copy;
iov->iov_base += copy;
}
iov++;
}
return 0;
}
static inline int sge_bytes(struct ib_sge *sge, int sge_cnt)
{
int bytes = 0;
while (sge_cnt > 0) {
bytes += sge->length;
sge++;
sge_cnt--;
}
return bytes;
}
void sdp_handle_sendsm(struct sdp_sock *ssk, u32 mseq_ack)
{
struct socket *sk = ssk->socket;
unsigned long flags;
spin_lock_irqsave(&ssk->tx_sa_lock, flags);
if (!ssk->tx_sa) {
sdp_prf1(sk, NULL, "SendSM for cancelled/finished SrcAvail");
goto out;
}
if (ssk->tx_sa->mseq > mseq_ack) {
sdp_dbg_data(sk, "SendSM arrived for old SrcAvail. "
"SendSM mseq_ack: 0x%x, SrcAvail mseq: 0x%x\n",
mseq_ack, ssk->tx_sa->mseq);
goto out;
}
sdp_dbg_data(sk, "Got SendSM - aborting SrcAvail\n");
ssk->tx_sa->abort_flags |= TX_SA_SENDSM;
cancel_delayed_work(&ssk->srcavail_cancel_work);
wake_up(sk->sk_sleep);
sdp_dbg_data(sk, "woke up sleepers\n");
out:
spin_unlock_irqrestore(&ssk->tx_sa_lock, flags);
}
void sdp_handle_rdma_read_compl(struct sdp_sock *ssk, u32 mseq_ack,
u32 bytes_completed)
{
struct socket *sk = ssk->socket;
unsigned long flags;
sdp_prf1(sk, NULL, "RdmaRdCompl ssk=%p tx_sa=%p", ssk, ssk->tx_sa);
sdp_dbg_data(sk, "RdmaRdCompl ssk=%p tx_sa=%p\n", ssk, ssk->tx_sa);
spin_lock_irqsave(&ssk->tx_sa_lock, flags);
BUG_ON(!ssk);
if (!ssk->tx_sa) {
sdp_dbg_data(sk, "Got RdmaRdCompl for aborted SrcAvail\n");
goto out;
}
if (ssk->tx_sa->mseq > mseq_ack) {
sdp_dbg_data(sk, "RdmaRdCompl arrived for old SrcAvail. "
"SendSM mseq_ack: 0x%x, SrcAvail mseq: 0x%x\n",
mseq_ack, ssk->tx_sa->mseq);
goto out;
}
ssk->tx_sa->bytes_acked += bytes_completed;
wake_up(sk->sk_sleep);
sdp_dbg_data(sk, "woke up sleepers\n");
out:
spin_unlock_irqrestore(&ssk->tx_sa_lock, flags);
return;
}
static unsigned long sdp_get_max_memlockable_bytes(unsigned long offset)
{
unsigned long avail;
unsigned long lock_limit;
if (capable(CAP_IPC_LOCK))
return ULONG_MAX;
lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
avail = lock_limit - (current->mm->locked_vm << PAGE_SHIFT);
return avail - offset;
}
static int sdp_alloc_fmr(struct socket *sk, void *uaddr, size_t len,
struct ib_pool_fmr **_fmr, struct ib_umem **_umem)
{
struct ib_pool_fmr *fmr;
struct ib_umem *umem;
struct ib_device *dev;
u64 *pages;
struct ib_umem_chunk *chunk;
int n, j, k;
int rc = 0;
unsigned long max_lockable_bytes;
if (unlikely(len > SDP_MAX_RDMA_READ_LEN)) {
sdp_dbg_data(sk, "len:0x%lx > FMR_SIZE: 0x%lx\n",
len, SDP_MAX_RDMA_READ_LEN);
len = SDP_MAX_RDMA_READ_LEN;
}
max_lockable_bytes = sdp_get_max_memlockable_bytes((unsigned long)uaddr & ~PAGE_MASK);
if (unlikely(len > max_lockable_bytes)) {
sdp_dbg_data(sk, "len:0x%lx > RLIMIT_MEMLOCK available: 0x%lx\n",
len, max_lockable_bytes);
len = max_lockable_bytes;
}
sdp_dbg_data(sk, "user buf: %p, len:0x%lx max_lockable_bytes: 0x%lx\n",
uaddr, len, max_lockable_bytes);
umem = ib_umem_get(&sdp_sk(sk)->context, (unsigned long)uaddr, len,
IB_ACCESS_REMOTE_WRITE, 0);
if (IS_ERR(umem)) {
rc = PTR_ERR(umem);
sdp_warn(sk, "Error doing umem_get 0x%lx bytes: %d\n", len, rc);
sdp_warn(sk, "RLIMIT_MEMLOCK: 0x%lx[cur] 0x%lx[max] CAP_IPC_LOCK: %d\n",
current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur,
current->signal->rlim[RLIMIT_MEMLOCK].rlim_max,
capable(CAP_IPC_LOCK));
goto err_umem_get;
}
sdp_dbg_data(sk, "umem->offset = 0x%x, length = 0x%lx\n",
umem->offset, umem->length);
pages = (u64 *) __get_free_page(GFP_KERNEL);
if (!pages)
goto err_pages_alloc;
n = 0;
dev = sdp_sk(sk)->ib_device;
list_for_each_entry(chunk, &umem->chunk_list, list) {
for (j = 0; j < chunk->nmap; ++j) {
len = ib_sg_dma_len(dev,
&chunk->page_list[j]) >> PAGE_SHIFT;
for (k = 0; k < len; ++k) {
pages[n++] = ib_sg_dma_address(dev,
&chunk->page_list[j]) +
umem->page_size * k;
}
}
}
fmr = ib_fmr_pool_map_phys(sdp_sk(sk)->sdp_dev->fmr_pool, pages, n, 0);
if (IS_ERR(fmr)) {
sdp_warn(sk, "Error allocating fmr: %ld\n", PTR_ERR(fmr));
goto err_fmr_alloc;
}
free_page((unsigned long) pages);
*_umem = umem;
*_fmr = fmr;
return 0;
err_fmr_alloc:
free_page((unsigned long) pages);
err_pages_alloc:
ib_umem_release(umem);
err_umem_get:
return rc;
}
void sdp_free_fmr(struct socket *sk, struct ib_pool_fmr **_fmr, struct ib_umem **_umem)
{
if (!sdp_sk(sk)->qp_active)
return;
ib_fmr_pool_unmap(*_fmr);
*_fmr = NULL;
ib_umem_release(*_umem);
*_umem = NULL;
}
static int sdp_post_rdma_read(struct socket *sk, struct rx_srcavail_state *rx_sa)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct ib_send_wr *bad_wr;
struct ib_send_wr wr = { NULL };
struct ib_sge sge;
wr.opcode = IB_WR_RDMA_READ;
wr.next = NULL;
wr.wr_id = SDP_OP_RDMA;
wr.wr.rdma.rkey = rx_sa->rkey;
wr.send_flags = 0;
ssk->tx_ring.rdma_inflight = rx_sa;
sge.addr = rx_sa->umem->offset;
sge.length = rx_sa->umem->length;
sge.lkey = rx_sa->fmr->fmr->lkey;
wr.wr.rdma.remote_addr = rx_sa->vaddr + rx_sa->used;
wr.num_sge = 1;
wr.sg_list = &sge;
rx_sa->busy++;
wr.send_flags = IB_SEND_SIGNALED;
return ib_post_send(ssk->qp, &wr, &bad_wr);
}
int sdp_rdma_to_iovec(struct socket *sk, struct iovec *iov, struct mbuf *mb,
unsigned long *used)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct rx_srcavail_state *rx_sa = RX_SRCAVAIL_STATE(mb);
int got_srcavail_cancel;
int rc = 0;
int len = *used;
int copied;
sdp_dbg_data(ssk->socket, "preparing RDMA read."
" len: 0x%x. buffer len: 0x%lx\n", len, iov->iov_len);
sock_hold(sk, SOCK_REF_RDMA_RD);
if (len > rx_sa->len) {
sdp_warn(sk, "len:0x%x > rx_sa->len: 0x%x\n", len, rx_sa->len);
WARN_ON(1);
len = rx_sa->len;
}
rc = sdp_alloc_fmr(sk, iov->iov_base, len, &rx_sa->fmr, &rx_sa->umem);
if (rc) {
sdp_warn(sk, "Error allocating fmr: %d\n", rc);
goto err_alloc_fmr;
}
rc = sdp_post_rdma_read(sk, rx_sa);
if (unlikely(rc)) {
sdp_warn(sk, "ib_post_send failed with status %d.\n", rc);
sdp_set_error(ssk->socket, -ECONNRESET);
wake_up(&ssk->wq);
goto err_post_send;
}
sdp_prf(sk, mb, "Finished posting(rc=%d), now to wait", rc);
got_srcavail_cancel = ssk->srcavail_cancel_mseq > rx_sa->mseq;
sdp_arm_tx_cq(sk);
sdp_wait_rdma_wr_finished(ssk);
sdp_prf(sk, mb, "Finished waiting(rc=%d)", rc);
if (!ssk->qp_active) {
sdp_dbg_data(sk, "QP destroyed during RDMA read\n");
rc = -EPIPE;
goto err_post_send;
}
copied = rx_sa->umem->length;
sdp_update_iov_used(sk, iov, copied);
rx_sa->used += copied;
atomic_add(copied, &ssk->rcv_nxt);
*used = copied;
ssk->tx_ring.rdma_inflight = NULL;
err_post_send:
sdp_free_fmr(sk, &rx_sa->fmr, &rx_sa->umem);
err_alloc_fmr:
if (rc && ssk->qp_active) {
sdp_warn(sk, "Couldn't do RDMA - post sendsm\n");
rx_sa->flags |= RX_SA_ABORTED;
}
sock_put(sk, SOCK_REF_RDMA_RD);
return rc;
}
static inline int wait_for_sndbuf(struct socket *sk, long *timeo_p)
{
struct sdp_sock *ssk = sdp_sk(sk);
int ret = 0;
int credits_needed = 1;
sdp_dbg_data(sk, "Wait for mem\n");
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
SDPSTATS_COUNTER_INC(send_wait_for_mem);
sdp_do_posts(ssk);
sdp_xmit_poll(ssk, 1);
ret = sdp_tx_wait_memory(ssk, timeo_p, &credits_needed);
return ret;
}
static int do_sdp_sendmsg_zcopy(struct socket *sk, struct tx_srcavail_state *tx_sa,
struct iovec *iov, long *timeo)
{
struct sdp_sock *ssk = sdp_sk(sk);
int rc = 0;
unsigned long lock_flags;
rc = sdp_alloc_fmr(sk, iov->iov_base, iov->iov_len,
&tx_sa->fmr, &tx_sa->umem);
if (rc) {
sdp_warn(sk, "Error allocating fmr: %d\n", rc);
goto err_alloc_fmr;
}
if (tx_slots_free(ssk) == 0) {
rc = wait_for_sndbuf(sk, timeo);
if (rc) {
sdp_warn(sk, "Couldn't get send buffer\n");
goto err_no_tx_slots;
}
}
rc = sdp_post_srcavail(sk, tx_sa);
if (rc) {
sdp_dbg(sk, "Error posting SrcAvail\n");
goto err_abort_send;
}
rc = sdp_wait_rdmardcompl(ssk, timeo, 0);
if (unlikely(rc)) {
enum tx_sa_flag f = tx_sa->abort_flags;
if (f & TX_SA_SENDSM) {
sdp_dbg_data(sk, "Got SendSM. use SEND verb.\n");
} else if (f & TX_SA_ERROR) {
sdp_dbg_data(sk, "SrcAvail error completion\n");
sdp_reset(sk);
SDPSTATS_COUNTER_INC(zcopy_tx_error);
} else if (ssk->qp_active) {
sdp_post_srcavail_cancel(sk);
/* Wait for RdmaRdCompl/SendSM to
* finish the transaction */
*timeo = 2 * HZ;
sdp_dbg_data(sk, "Waiting for SendSM\n");
sdp_wait_rdmardcompl(ssk, timeo, 1);
sdp_dbg_data(sk, "finished waiting\n");
cancel_delayed_work(&ssk->srcavail_cancel_work);
} else {
sdp_dbg_data(sk, "QP was destroyed while waiting\n");
}
} else {
sdp_dbg_data(sk, "got RdmaRdCompl\n");
}
spin_lock_irqsave(&ssk->tx_sa_lock, lock_flags);
ssk->tx_sa = NULL;
spin_unlock_irqrestore(&ssk->tx_sa_lock, lock_flags);
err_abort_send:
sdp_update_iov_used(sk, iov, tx_sa->bytes_acked);
err_no_tx_slots:
sdp_free_fmr(sk, &tx_sa->fmr, &tx_sa->umem);
err_alloc_fmr:
return rc;
}
int sdp_sendmsg_zcopy(struct kiocb *iocb, struct socket *sk, struct iovec *iov)
{
struct sdp_sock *ssk = sdp_sk(sk);
int rc = 0;
long timeo;
struct tx_srcavail_state *tx_sa;
int offset;
size_t bytes_to_copy = 0;
int copied = 0;
sdp_dbg_data(sk, "Sending iov: %p, iov_len: 0x%lx\n",
iov->iov_base, iov->iov_len);
sdp_prf1(sk, NULL, "sdp_sendmsg_zcopy start");
if (ssk->rx_sa) {
sdp_dbg_data(sk, "Deadlock prevent: crossing SrcAvail\n");
return 0;
}
sock_hold(ssk->socket, SOCK_REF_ZCOPY);
SDPSTATS_COUNTER_INC(sendmsg_zcopy_segment);
timeo = SDP_SRCAVAIL_ADV_TIMEOUT ;
/* Ok commence sending. */
offset = (unsigned long)iov->iov_base & (PAGE_SIZE - 1);
tx_sa = kmalloc(sizeof(struct tx_srcavail_state), GFP_KERNEL);
if (!tx_sa) {
sdp_warn(sk, "Error allocating zcopy context\n");
rc = -EAGAIN; /* Buffer too big - fallback to bcopy */
goto err_alloc_tx_sa;
}
bytes_to_copy = iov->iov_len;
do {
tx_sa_reset(tx_sa);
rc = do_sdp_sendmsg_zcopy(sk, tx_sa, iov, &timeo);
if (iov->iov_len && iov->iov_len < sdp_zcopy_thresh) {
sdp_dbg_data(sk, "0x%lx bytes left, switching to bcopy\n",
iov->iov_len);
break;
}
} while (!rc && iov->iov_len > 0 && !tx_sa->abort_flags);
kfree(tx_sa);
err_alloc_tx_sa:
copied = bytes_to_copy - iov->iov_len;
sdp_prf1(sk, NULL, "sdp_sendmsg_zcopy end rc: %d copied: %d", rc, copied);
sock_put(ssk->socket, SOCK_REF_ZCOPY);
if (rc < 0 && rc != -EAGAIN && rc != -ETIME)
return rc;
return copied;
}
void sdp_abort_srcavail(struct socket *sk)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct tx_srcavail_state *tx_sa = ssk->tx_sa;
unsigned long flags;
if (!tx_sa)
return;
cancel_delayed_work(&ssk->srcavail_cancel_work);
flush_scheduled_work();
spin_lock_irqsave(&ssk->tx_sa_lock, flags);
sdp_free_fmr(sk, &tx_sa->fmr, &tx_sa->umem);
ssk->tx_sa = NULL;
spin_unlock_irqrestore(&ssk->tx_sa_lock, flags);
}
void sdp_abort_rdma_read(struct socket *sk)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct rx_srcavail_state *rx_sa = ssk->rx_sa;
if (!rx_sa)
return;
sdp_free_fmr(sk, &rx_sa->fmr, &rx_sa->umem);
ssk->rx_sa = NULL;
}