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/*
* Copyright (c) 2009 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 "sdp.h"
SDP_MODPARAM_INT(rcvbuf_initial_size, 32 * 1024,
"Receive buffer initial size in bytes.");
SDP_MODPARAM_SINT(rcvbuf_scale, 0x8,
"Receive buffer size scale factor.");
/* Like tcp_fin - called when SDP_MID_DISCONNECT is received */
static void
sdp_handle_disconn(struct sdp_sock *ssk)
{
sdp_dbg(ssk->socket, "%s\n", __func__);
SDP_WLOCK_ASSERT(ssk);
if (TCPS_HAVERCVDFIN(ssk->state) == 0)
socantrcvmore(ssk->socket);
switch (ssk->state) {
case TCPS_SYN_RECEIVED:
case TCPS_ESTABLISHED:
ssk->state = TCPS_CLOSE_WAIT;
break;
case TCPS_FIN_WAIT_1:
/* Received a reply FIN - start Infiniband tear down */
sdp_dbg(ssk->socket,
"%s: Starting Infiniband tear down sending DREQ\n",
__func__);
sdp_cancel_dreq_wait_timeout(ssk);
ssk->qp_active = 0;
if (ssk->id) {
struct rdma_cm_id *id;
id = ssk->id;
SDP_WUNLOCK(ssk);
rdma_disconnect(id);
SDP_WLOCK(ssk);
} else {
sdp_warn(ssk->socket,
"%s: ssk->id is NULL\n", __func__);
return;
}
break;
case TCPS_TIME_WAIT:
/* This is a mutual close situation and we've got the DREQ from
the peer before the SDP_MID_DISCONNECT */
break;
case TCPS_CLOSED:
/* FIN arrived after IB teardown started - do nothing */
sdp_dbg(ssk->socket, "%s: fin in state %s\n",
__func__, sdp_state_str(ssk->state));
return;
default:
sdp_warn(ssk->socket,
"%s: FIN in unexpected state. state=%d\n",
__func__, ssk->state);
break;
}
}
static int
sdp_post_recv(struct sdp_sock *ssk)
{
struct sdp_buf *rx_req;
int i, rc;
u64 addr;
struct ib_device *dev;
struct ib_recv_wr rx_wr = { NULL };
struct ib_sge ibsge[SDP_MAX_RECV_SGES];
struct ib_sge *sge = ibsge;
struct ib_recv_wr *bad_wr;
struct mbuf *mb, *m;
struct sdp_bsdh *h;
int id = ring_head(ssk->rx_ring);
/* Now, allocate and repost recv */
sdp_prf(ssk->socket, mb, "Posting mb");
mb = m_getm2(NULL, ssk->recv_bytes, M_NOWAIT, MT_DATA, M_PKTHDR);
if (mb == NULL) {
/* Retry so we can't stall out with no memory. */
if (!rx_ring_posted(ssk))
queue_work(rx_comp_wq, &ssk->rx_comp_work);
return -1;
}
for (m = mb; m != NULL; m = m->m_next) {
m->m_len = (m->m_flags & M_EXT) ? m->m_ext.ext_size :
((m->m_flags & M_PKTHDR) ? MHLEN : MLEN);
mb->m_pkthdr.len += m->m_len;
}
h = mtod(mb, struct sdp_bsdh *);
rx_req = ssk->rx_ring.buffer + (id & (SDP_RX_SIZE - 1));
rx_req->mb = mb;
dev = ssk->ib_device;
for (i = 0; mb != NULL; i++, mb = mb->m_next, sge++) {
addr = ib_dma_map_single(dev, mb->m_data, mb->m_len,
DMA_TO_DEVICE);
/* TODO: proper error handling */
BUG_ON(ib_dma_mapping_error(dev, addr));
BUG_ON(i >= SDP_MAX_RECV_SGES);
rx_req->mapping[i] = addr;
sge->addr = addr;
sge->length = mb->m_len;
sge->lkey = ssk->sdp_dev->mr->lkey;
}
rx_wr.next = NULL;
rx_wr.wr_id = id | SDP_OP_RECV;
rx_wr.sg_list = ibsge;
rx_wr.num_sge = i;
rc = ib_post_recv(ssk->qp, &rx_wr, &bad_wr);
if (unlikely(rc)) {
sdp_warn(ssk->socket, "ib_post_recv failed. status %d\n", rc);
sdp_cleanup_sdp_buf(ssk, rx_req, DMA_FROM_DEVICE);
m_freem(mb);
sdp_notify(ssk, ECONNRESET);
return -1;
}
atomic_inc(&ssk->rx_ring.head);
SDPSTATS_COUNTER_INC(post_recv);
return 0;
}
static inline int
sdp_post_recvs_needed(struct sdp_sock *ssk)
{
unsigned long bytes_in_process;
unsigned long max_bytes;
int buffer_size;
int posted;
if (!ssk->qp_active || !ssk->socket)
return 0;
posted = rx_ring_posted(ssk);
if (posted >= SDP_RX_SIZE)
return 0;
if (posted < SDP_MIN_TX_CREDITS)
return 1;
buffer_size = ssk->recv_bytes;
max_bytes = max(ssk->socket->so_snd.sb_hiwat,
(1 + SDP_MIN_TX_CREDITS) * buffer_size);
max_bytes *= rcvbuf_scale;
/*
* Compute bytes in the receive queue and socket buffer.
*/
bytes_in_process = (posted - SDP_MIN_TX_CREDITS) * buffer_size;
bytes_in_process += ssk->socket->so_rcv.sb_cc;
return bytes_in_process < max_bytes;
}
static inline void
sdp_post_recvs(struct sdp_sock *ssk)
{
while (sdp_post_recvs_needed(ssk))
if (sdp_post_recv(ssk))
return;
}
static inline struct mbuf *
sdp_sock_queue_rcv_mb(struct socket *sk, struct mbuf *mb)
{
struct sdp_sock *ssk = sdp_sk(sk);
struct sdp_bsdh *h;
h = mtod(mb, struct sdp_bsdh *);
#ifdef SDP_ZCOPY
SDP_SKB_CB(mb)->seq = rcv_nxt(ssk);
if (h->mid == SDP_MID_SRCAVAIL) {
struct sdp_srcah *srcah = (struct sdp_srcah *)(h+1);
struct rx_srcavail_state *rx_sa;
ssk->srcavail_cancel_mseq = 0;
ssk->rx_sa = rx_sa = RX_SRCAVAIL_STATE(mb) = kzalloc(
sizeof(struct rx_srcavail_state), M_NOWAIT);
rx_sa->mseq = ntohl(h->mseq);
rx_sa->used = 0;
rx_sa->len = mb_len = ntohl(srcah->len);
rx_sa->rkey = ntohl(srcah->rkey);
rx_sa->vaddr = be64_to_cpu(srcah->vaddr);
rx_sa->flags = 0;
if (ssk->tx_sa) {
sdp_dbg_data(ssk->socket, "got RX SrcAvail while waiting "
"for TX SrcAvail. waking up TX SrcAvail"
"to be aborted\n");
wake_up(sk->sk_sleep);
}
atomic_add(mb->len, &ssk->rcv_nxt);
sdp_dbg_data(sk, "queueing SrcAvail. mb_len = %d vaddr = %lld\n",
mb_len, rx_sa->vaddr);
} else
#endif
{
atomic_add(mb->m_pkthdr.len, &ssk->rcv_nxt);
}
m_adj(mb, SDP_HEAD_SIZE);
SOCKBUF_LOCK(&sk->so_rcv);
if (unlikely(h->flags & SDP_OOB_PRES))
sdp_urg(ssk, mb);
sbappend_locked(&sk->so_rcv, mb);
sorwakeup_locked(sk);
return mb;
}
static int
sdp_get_recv_bytes(struct sdp_sock *ssk, u32 new_size)
{
return MIN(new_size, SDP_MAX_PACKET);
}
int
sdp_init_buffers(struct sdp_sock *ssk, u32 new_size)
{
ssk->recv_bytes = sdp_get_recv_bytes(ssk, new_size);
sdp_post_recvs(ssk);
return 0;
}
int
sdp_resize_buffers(struct sdp_sock *ssk, u32 new_size)
{
u32 curr_size = ssk->recv_bytes;
u32 max_size = SDP_MAX_PACKET;
if (new_size > curr_size && new_size <= max_size) {
ssk->recv_bytes = sdp_get_recv_bytes(ssk, new_size);
return 0;
}
return -1;
}
static void
sdp_handle_resize_request(struct sdp_sock *ssk, struct sdp_chrecvbuf *buf)
{
if (sdp_resize_buffers(ssk, ntohl(buf->size)) == 0)
ssk->recv_request_head = ring_head(ssk->rx_ring) + 1;
else
ssk->recv_request_head = ring_tail(ssk->rx_ring);
ssk->recv_request = 1;
}
static void
sdp_handle_resize_ack(struct sdp_sock *ssk, struct sdp_chrecvbuf *buf)
{
u32 new_size = ntohl(buf->size);
if (new_size > ssk->xmit_size_goal)
ssk->xmit_size_goal = new_size;
}
static struct mbuf *
sdp_recv_completion(struct sdp_sock *ssk, int id)
{
struct sdp_buf *rx_req;
struct ib_device *dev;
struct mbuf *mb;
if (unlikely(id != ring_tail(ssk->rx_ring))) {
printk(KERN_WARNING "Bogus recv completion id %d tail %d\n",
id, ring_tail(ssk->rx_ring));
return NULL;
}
dev = ssk->ib_device;
rx_req = &ssk->rx_ring.buffer[id & (SDP_RX_SIZE - 1)];
mb = rx_req->mb;
sdp_cleanup_sdp_buf(ssk, rx_req, DMA_FROM_DEVICE);
atomic_inc(&ssk->rx_ring.tail);
atomic_dec(&ssk->remote_credits);
return mb;
}
/* socket lock should be taken before calling this */
static int
sdp_process_rx_ctl_mb(struct sdp_sock *ssk, struct mbuf *mb)
{
struct sdp_bsdh *h;
struct socket *sk;
SDP_WLOCK_ASSERT(ssk);
sk = ssk->socket;
h = mtod(mb, struct sdp_bsdh *);
switch (h->mid) {
case SDP_MID_DATA:
case SDP_MID_SRCAVAIL:
sdp_dbg(sk, "DATA after socket rcv was shutdown\n");
/* got data in RCV_SHUTDOWN */
if (ssk->state == TCPS_FIN_WAIT_1) {
sdp_dbg(sk, "RX data when state = FIN_WAIT1\n");
sdp_notify(ssk, ECONNRESET);
}
m_freem(mb);
break;
#ifdef SDP_ZCOPY
case SDP_MID_RDMARDCOMPL:
m_freem(mb);
break;
case SDP_MID_SENDSM:
sdp_handle_sendsm(ssk, ntohl(h->mseq_ack));
m_freem(mb);
break;
case SDP_MID_SRCAVAIL_CANCEL:
sdp_dbg_data(sk, "Handling SrcAvailCancel\n");
sdp_prf(sk, NULL, "Handling SrcAvailCancel");
if (ssk->rx_sa) {
ssk->srcavail_cancel_mseq = ntohl(h->mseq);
ssk->rx_sa->flags |= RX_SA_ABORTED;
ssk->rx_sa = NULL; /* TODO: change it into SDP_MID_DATA and get
the dirty logic from recvmsg */
} else {
sdp_dbg(sk, "Got SrcAvailCancel - "
"but no SrcAvail in process\n");
}
m_freem(mb);
break;
case SDP_MID_SINKAVAIL:
sdp_dbg_data(sk, "Got SinkAvail - not supported: ignored\n");
sdp_prf(sk, NULL, "Got SinkAvail - not supported: ignored");
/* FALLTHROUGH */
#endif
case SDP_MID_ABORT:
sdp_dbg_data(sk, "Handling ABORT\n");
sdp_prf(sk, NULL, "Handling ABORT");
sdp_notify(ssk, ECONNRESET);
m_freem(mb);
break;
case SDP_MID_DISCONN:
sdp_dbg_data(sk, "Handling DISCONN\n");
sdp_prf(sk, NULL, "Handling DISCONN");
sdp_handle_disconn(ssk);
break;
case SDP_MID_CHRCVBUF:
sdp_dbg_data(sk, "Handling RX CHRCVBUF\n");
sdp_handle_resize_request(ssk, (struct sdp_chrecvbuf *)(h+1));
m_freem(mb);
break;
case SDP_MID_CHRCVBUF_ACK:
sdp_dbg_data(sk, "Handling RX CHRCVBUF_ACK\n");
sdp_handle_resize_ack(ssk, (struct sdp_chrecvbuf *)(h+1));
m_freem(mb);
break;
default:
/* TODO: Handle other messages */
sdp_warn(sk, "SDP: FIXME MID %d\n", h->mid);
m_freem(mb);
}
return 0;
}
static int
sdp_process_rx_mb(struct sdp_sock *ssk, struct mbuf *mb)
{
struct socket *sk;
struct sdp_bsdh *h;
unsigned long mseq_ack;
int credits_before;
h = mtod(mb, struct sdp_bsdh *);
sk = ssk->socket;
/*
* If another thread is in so_pcbfree this may be partially torn
* down but no further synchronization is required as the destroying
* thread will wait for receive to shutdown before discarding the
* socket.
*/
if (sk == NULL) {
m_freem(mb);
return 0;
}
SDPSTATS_HIST_LINEAR(credits_before_update, tx_credits(ssk));
mseq_ack = ntohl(h->mseq_ack);
credits_before = tx_credits(ssk);
atomic_set(&ssk->tx_ring.credits, mseq_ack - ring_head(ssk->tx_ring) +
1 + ntohs(h->bufs));
if (mseq_ack >= ssk->nagle_last_unacked)
ssk->nagle_last_unacked = 0;
sdp_prf1(ssk->socket, mb, "RX %s +%d c:%d->%d mseq:%d ack:%d\n",
mid2str(h->mid), ntohs(h->bufs), credits_before,
tx_credits(ssk), ntohl(h->mseq), ntohl(h->mseq_ack));
if (unlikely(h->mid == SDP_MID_DATA &&
mb->m_pkthdr.len == SDP_HEAD_SIZE)) {
/* Credit update is valid even after RCV_SHUTDOWN */
m_freem(mb);
return 0;
}
if ((h->mid != SDP_MID_DATA && h->mid != SDP_MID_SRCAVAIL) ||
TCPS_HAVERCVDFIN(ssk->state)) {
sdp_prf(sk, NULL, "Control mb - queing to control queue");
#ifdef SDP_ZCOPY
if (h->mid == SDP_MID_SRCAVAIL_CANCEL) {
sdp_dbg_data(sk, "Got SrcAvailCancel. "
"seq: 0x%d seq_ack: 0x%d\n",
ntohl(h->mseq), ntohl(h->mseq_ack));
ssk->srcavail_cancel_mseq = ntohl(h->mseq);
}
if (h->mid == SDP_MID_RDMARDCOMPL) {
struct sdp_rrch *rrch = (struct sdp_rrch *)(h+1);
sdp_dbg_data(sk, "RdmaRdCompl message arrived\n");
sdp_handle_rdma_read_compl(ssk, ntohl(h->mseq_ack),
ntohl(rrch->len));
}
#endif
mb->m_nextpkt = NULL;
if (ssk->rx_ctl_tail)
ssk->rx_ctl_tail->m_nextpkt = mb;
else
ssk->rx_ctl_q = mb;
ssk->rx_ctl_tail = mb;
return 0;
}
sdp_prf1(sk, NULL, "queueing %s mb\n", mid2str(h->mid));
mb = sdp_sock_queue_rcv_mb(sk, mb);
return 0;
}
/* called only from irq */
static struct mbuf *
sdp_process_rx_wc(struct sdp_sock *ssk, struct ib_wc *wc)
{
struct mbuf *mb;
struct sdp_bsdh *h;
struct socket *sk = ssk->socket;
int mseq;
mb = sdp_recv_completion(ssk, wc->wr_id);
if (unlikely(!mb))
return NULL;
if (unlikely(wc->status)) {
if (ssk->qp_active && sk) {
sdp_dbg(sk, "Recv completion with error. "
"Status %d, vendor: %d\n",
wc->status, wc->vendor_err);
sdp_abort(sk);
ssk->qp_active = 0;
}
m_freem(mb);
return NULL;
}
sdp_dbg_data(sk, "Recv completion. ID %d Length %d\n",
(int)wc->wr_id, wc->byte_len);
if (unlikely(wc->byte_len < sizeof(struct sdp_bsdh))) {
sdp_warn(sk, "SDP BUG! byte_len %d < %zd\n",
wc->byte_len, sizeof(struct sdp_bsdh));
m_freem(mb);
return NULL;
}
/* Use m_adj to trim the tail of data we didn't use. */
m_adj(mb, -(mb->m_pkthdr.len - wc->byte_len));
h = mtod(mb, struct sdp_bsdh *);
SDP_DUMP_PACKET(ssk->socket, "RX", mb, h);
ssk->rx_packets++;
ssk->rx_bytes += mb->m_pkthdr.len;
mseq = ntohl(h->mseq);
atomic_set(&ssk->mseq_ack, mseq);
if (mseq != (int)wc->wr_id)
sdp_warn(sk, "SDP BUG! mseq %d != wrid %d\n",
mseq, (int)wc->wr_id);
return mb;
}
/* Wakeup writers if we now have credits. */
static void
sdp_bzcopy_write_space(struct sdp_sock *ssk)
{
struct socket *sk = ssk->socket;
if (tx_credits(ssk) >= ssk->min_bufs && sk)
sowwakeup(sk);
}
/* only from interrupt. */
static int
sdp_poll_rx_cq(struct sdp_sock *ssk)
{
struct ib_cq *cq = ssk->rx_ring.cq;
struct ib_wc ibwc[SDP_NUM_WC];
int n, i;
int wc_processed = 0;
struct mbuf *mb;
do {
n = ib_poll_cq(cq, SDP_NUM_WC, ibwc);
for (i = 0; i < n; ++i) {
struct ib_wc *wc = &ibwc[i];
BUG_ON(!(wc->wr_id & SDP_OP_RECV));
mb = sdp_process_rx_wc(ssk, wc);
if (!mb)
continue;
sdp_process_rx_mb(ssk, mb);
wc_processed++;
}
} while (n == SDP_NUM_WC);
if (wc_processed)
sdp_bzcopy_write_space(ssk);
return wc_processed;
}
static void
sdp_rx_comp_work(struct work_struct *work)
{
struct sdp_sock *ssk = container_of(work, struct sdp_sock,
rx_comp_work);
sdp_prf(ssk->socket, NULL, "%s", __func__);
SDP_WLOCK(ssk);
if (unlikely(!ssk->qp)) {
sdp_prf(ssk->socket, NULL, "qp was destroyed");
goto out;
}
if (unlikely(!ssk->rx_ring.cq)) {
sdp_prf(ssk->socket, NULL, "rx_ring.cq is NULL");
goto out;
}
if (unlikely(!ssk->poll_cq)) {
struct rdma_cm_id *id = ssk->id;
if (id && id->qp)
rdma_notify(id, RDMA_CM_EVENT_ESTABLISHED);
goto out;
}
sdp_do_posts(ssk);
out:
SDP_WUNLOCK(ssk);
}
void
sdp_do_posts(struct sdp_sock *ssk)
{
struct socket *sk = ssk->socket;
int xmit_poll_force;
struct mbuf *mb;
SDP_WLOCK_ASSERT(ssk);
if (!ssk->qp_active) {
sdp_dbg(sk, "QP is deactivated\n");
return;
}
while ((mb = ssk->rx_ctl_q)) {
ssk->rx_ctl_q = mb->m_nextpkt;
mb->m_nextpkt = NULL;
sdp_process_rx_ctl_mb(ssk, mb);
}
if (ssk->state == TCPS_TIME_WAIT)
return;
if (!ssk->rx_ring.cq || !ssk->tx_ring.cq)
return;
sdp_post_recvs(ssk);
if (tx_ring_posted(ssk))
sdp_xmit_poll(ssk, 1);
sdp_post_sends(ssk, M_NOWAIT);
xmit_poll_force = tx_credits(ssk) < SDP_MIN_TX_CREDITS;
if (credit_update_needed(ssk) || xmit_poll_force) {
/* if has pending tx because run out of tx_credits - xmit it */
sdp_prf(sk, NULL, "Processing to free pending sends");
sdp_xmit_poll(ssk, xmit_poll_force);
sdp_prf(sk, NULL, "Sending credit update");
sdp_post_sends(ssk, M_NOWAIT);
}
}
int
sdp_process_rx(struct sdp_sock *ssk)
{
int wc_processed = 0;
int credits_before;
if (!rx_ring_trylock(&ssk->rx_ring)) {
sdp_dbg(ssk->socket, "ring destroyed. not polling it\n");
return 0;
}
credits_before = tx_credits(ssk);
wc_processed = sdp_poll_rx_cq(ssk);
sdp_prf(ssk->socket, NULL, "processed %d", wc_processed);
if (wc_processed) {
sdp_prf(ssk->socket, NULL, "credits: %d -> %d",
credits_before, tx_credits(ssk));
queue_work(rx_comp_wq, &ssk->rx_comp_work);
}
sdp_arm_rx_cq(ssk);
rx_ring_unlock(&ssk->rx_ring);
return (wc_processed);
}
static void
sdp_rx_irq(struct ib_cq *cq, void *cq_context)
{
struct socket *sk = cq_context;
struct sdp_sock *ssk = sdp_sk(sk);
if (cq != ssk->rx_ring.cq) {
sdp_dbg(sk, "cq = %p, ssk->cq = %p\n", cq, ssk->rx_ring.cq);
return;
}
SDPSTATS_COUNTER_INC(rx_int_count);
sdp_prf(sk, NULL, "rx irq");
sdp_process_rx(ssk);
}
static
void sdp_rx_ring_purge(struct sdp_sock *ssk)
{
while (rx_ring_posted(ssk) > 0) {
struct mbuf *mb;
mb = sdp_recv_completion(ssk, ring_tail(ssk->rx_ring));
if (!mb)
break;
m_freem(mb);
}
}
void
sdp_rx_ring_init(struct sdp_sock *ssk)
{
ssk->rx_ring.buffer = NULL;
ssk->rx_ring.destroyed = 0;
rw_init(&ssk->rx_ring.destroyed_lock, "sdp rx lock");
}
static void
sdp_rx_cq_event_handler(struct ib_event *event, void *data)
{
}
int
sdp_rx_ring_create(struct sdp_sock *ssk, struct ib_device *device)
{
struct ib_cq *rx_cq;
int rc = 0;
sdp_dbg(ssk->socket, "rx ring created");
INIT_WORK(&ssk->rx_comp_work, sdp_rx_comp_work);
atomic_set(&ssk->rx_ring.head, 1);
atomic_set(&ssk->rx_ring.tail, 1);
ssk->rx_ring.buffer = kmalloc(
sizeof *ssk->rx_ring.buffer * SDP_RX_SIZE, GFP_KERNEL);
if (!ssk->rx_ring.buffer) {
sdp_warn(ssk->socket,
"Unable to allocate RX Ring size %zd.\n",
sizeof(*ssk->rx_ring.buffer) * SDP_RX_SIZE);
return -ENOMEM;
}
rx_cq = ib_create_cq(device, sdp_rx_irq, sdp_rx_cq_event_handler,
ssk->socket, SDP_RX_SIZE, IB_CQ_VECTOR_LEAST_ATTACHED);
if (IS_ERR(rx_cq)) {
rc = PTR_ERR(rx_cq);
sdp_warn(ssk->socket, "Unable to allocate RX CQ: %d.\n", rc);
goto err_cq;
}
sdp_sk(ssk->socket)->rx_ring.cq = rx_cq;
sdp_arm_rx_cq(ssk);
return 0;
err_cq:
kfree(ssk->rx_ring.buffer);
ssk->rx_ring.buffer = NULL;
return rc;
}
void
sdp_rx_ring_destroy(struct sdp_sock *ssk)
{
cancel_work_sync(&ssk->rx_comp_work);
rx_ring_destroy_lock(&ssk->rx_ring);
if (ssk->rx_ring.buffer) {
sdp_rx_ring_purge(ssk);
kfree(ssk->rx_ring.buffer);
ssk->rx_ring.buffer = NULL;
}
if (ssk->rx_ring.cq) {
if (ib_destroy_cq(ssk->rx_ring.cq)) {
sdp_warn(ssk->socket, "destroy cq(%p) failed\n",
ssk->rx_ring.cq);
} else {
ssk->rx_ring.cq = NULL;
}
}
WARN_ON(ring_head(ssk->rx_ring) != ring_tail(ssk->rx_ring));
}