int ret = -ENOMEM;
if (recv->r_ibinc == NULL) {
- if (atomic_read(&rds_ib_allocation) >= rds_ib_sysctl_max_recv_allocation) {
+ if (!atomic_add_unless(&rds_ib_allocation, 1, rds_ib_sysctl_max_recv_allocation)) {
rds_ib_stats_inc(s_ib_rx_alloc_limit);
goto out;
}
recv->r_ibinc = kmem_cache_alloc(rds_ib_incoming_slab,
kptr_gfp);
- if (recv->r_ibinc == NULL)
+ if (recv->r_ibinc == NULL) {
+ atomic_dec(&rds_ib_allocation);
goto out;
- atomic_inc(&rds_ib_allocation);
+ }
INIT_LIST_HEAD(&recv->r_ibinc->ii_frags);
rds_inc_init(&recv->r_ibinc->ii_inc, conn, conn->c_faddr);
}
int ret = 0;
u32 pos;
- while ((prefill || rds_conn_up(conn))
- && rds_ib_ring_alloc(&ic->i_recv_ring, 1, &pos)) {
+ while ((prefill || rds_conn_up(conn)) &&
+ rds_ib_ring_alloc(&ic->i_recv_ring, 1, &pos)) {
if (pos >= ic->i_recv_ring.w_nr) {
printk(KERN_NOTICE "Argh - ring alloc returned pos=%u\n",
pos);
* room for it beyond the ring size. Send completion notices its special
* wr_id and avoids working with the ring in that case.
*/
+#ifndef KERNEL_HAS_ATOMIC64
+static void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq,
+ int ack_required)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ic->i_ack_lock, flags);
+ ic->i_ack_next = seq;
+ if (ack_required)
+ set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
+ spin_unlock_irqrestore(&ic->i_ack_lock, flags);
+}
+
+static u64 rds_ib_get_ack(struct rds_ib_connection *ic)
+{
+ unsigned long flags;
+ u64 seq;
+
+ clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
+
+ spin_lock_irqsave(&ic->i_ack_lock, flags);
+ seq = ic->i_ack_next;
+ spin_unlock_irqrestore(&ic->i_ack_lock, flags);
+
+ return seq;
+}
+#else
static void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq,
int ack_required)
{
- rds_ib_set_64bit(&ic->i_ack_next, seq);
+ atomic64_set(&ic->i_ack_next, seq);
if (ack_required) {
smp_mb__before_clear_bit();
set_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
clear_bit(IB_ACK_REQUESTED, &ic->i_ack_flags);
smp_mb__after_clear_bit();
- return ic->i_ack_next;
+ return atomic64_read(&ic->i_ack_next);
}
+#endif
+
static void rds_ib_send_ack(struct rds_ib_connection *ic, unsigned int adv_credits)
{
* - i_ack_next, which is the last sequence number we received
*
* Potentially, send queue and receive queue handlers can run concurrently.
+ * It would be nice to not have to use a spinlock to synchronize things,
+ * but the one problem that rules this out is that 64bit updates are
+ * not atomic on all platforms. Things would be a lot simpler if
+ * we had atomic64 or maybe cmpxchg64 everywhere.
*
* Reconnecting complicates this picture just slightly. When we
* reconnect, we may be seeing duplicate packets. The peer
}
/* Can we get a send credit? */
- if (!rds_ib_send_grab_credits(ic, 1, &adv_credits, 0)) {
+ if (!rds_ib_send_grab_credits(ic, 1, &adv_credits, 0, RDS_MAX_ADV_CREDIT)) {
rds_ib_stats_inc(s_ib_tx_throttle);
clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
return;
return rds_ib_get_ack(ic);
}
+static struct rds_header *rds_ib_get_header(struct rds_connection *conn,
+ struct rds_ib_recv_work *recv,
+ u32 data_len)
+{
+ struct rds_ib_connection *ic = conn->c_transport_data;
+ void *hdr_buff = &ic->i_recv_hdrs[recv - ic->i_recvs];
+ void *addr;
+ u32 misplaced_hdr_bytes;
+
+ /*
+ * Support header at the front (RDS 3.1+) as well as header-at-end.
+ *
+ * Cases:
+ * 1) header all in header buff (great!)
+ * 2) header all in data page (copy all to header buff)
+ * 3) header split across hdr buf + data page
+ * (move bit in hdr buff to end before copying other bit from data page)
+ */
+ if (conn->c_version > RDS_PROTOCOL_3_0 || data_len == RDS_FRAG_SIZE)
+ return hdr_buff;
+
+ if (data_len <= (RDS_FRAG_SIZE - sizeof(struct rds_header))) {
+ addr = kmap_atomic(recv->r_frag->f_page, KM_SOFTIRQ0);
+ memcpy(hdr_buff,
+ addr + recv->r_frag->f_offset + data_len,
+ sizeof(struct rds_header));
+ kunmap_atomic(addr, KM_SOFTIRQ0);
+ return hdr_buff;
+ }
+
+ misplaced_hdr_bytes = (sizeof(struct rds_header) - (RDS_FRAG_SIZE - data_len));
+
+ memmove(hdr_buff + misplaced_hdr_bytes, hdr_buff, misplaced_hdr_bytes);
+
+ addr = kmap_atomic(recv->r_frag->f_page, KM_SOFTIRQ0);
+ memcpy(hdr_buff, addr + recv->r_frag->f_offset + data_len,
+ sizeof(struct rds_header) - misplaced_hdr_bytes);
+ kunmap_atomic(addr, KM_SOFTIRQ0);
+ return hdr_buff;
+}
+
/*
* It's kind of lame that we're copying from the posted receive pages into
* long-lived bitmaps. We could have posted the bitmaps and rdma written into
};
static void rds_ib_process_recv(struct rds_connection *conn,
- struct rds_ib_recv_work *recv, u32 byte_len,
+ struct rds_ib_recv_work *recv, u32 data_len,
struct rds_ib_ack_state *state)
{
struct rds_ib_connection *ic = conn->c_transport_data;
/* XXX shut down the connection if port 0,0 are seen? */
rdsdebug("ic %p ibinc %p recv %p byte len %u\n", ic, ibinc, recv,
- byte_len);
+ data_len);
- if (byte_len < sizeof(struct rds_header)) {
+ if (data_len < sizeof(struct rds_header)) {
rds_ib_conn_error(conn, "incoming message "
"from %pI4 didn't inclue a "
"header, disconnecting and "
&conn->c_faddr);
return;
}
- byte_len -= sizeof(struct rds_header);
+ data_len -= sizeof(struct rds_header);
- ihdr = &ic->i_recv_hdrs[recv - ic->i_recvs];
+ ihdr = rds_ib_get_header(conn, recv, data_len);
/* Validate the checksum. */
if (!rds_message_verify_checksum(ihdr)) {
if (ihdr->h_credit)
rds_ib_send_add_credits(conn, ihdr->h_credit);
- if (ihdr->h_sport == 0 && ihdr->h_dport == 0 && byte_len == 0) {
+ if (ihdr->h_sport == 0 && ihdr->h_dport == 0 && data_len == 0) {
/* This is an ACK-only packet. The fact that it gets
* special treatment here is that historically, ACKs
* were rather special beasts.
hdr = &ibinc->ii_inc.i_hdr;
/* We can't just use memcmp here; fragments of a
* single message may carry different ACKs */
- if (hdr->h_sequence != ihdr->h_sequence
- || hdr->h_len != ihdr->h_len
- || hdr->h_sport != ihdr->h_sport
- || hdr->h_dport != ihdr->h_dport) {
+ if (hdr->h_sequence != ihdr->h_sequence ||
+ hdr->h_len != ihdr->h_len ||
+ hdr->h_sport != ihdr->h_sport ||
+ hdr->h_dport != ihdr->h_dport) {
rds_ib_conn_error(conn,
"fragment header mismatch; forcing reconnect\n");
return;
{
struct rds_connection *conn = context;
struct rds_ib_connection *ic = conn->c_transport_data;
- struct ib_wc wc;
- struct rds_ib_ack_state state = { 0, };
- struct rds_ib_recv_work *recv;
rdsdebug("conn %p cq %p\n", conn, cq);
rds_ib_stats_inc(s_ib_rx_cq_call);
- ib_req_notify_cq(cq, IB_CQ_SOLICITED);
+ tasklet_schedule(&ic->i_recv_tasklet);
+}
+
+static inline void rds_poll_cq(struct rds_ib_connection *ic,
+ struct rds_ib_ack_state *state)
+{
+ struct rds_connection *conn = ic->conn;
+ struct ib_wc wc;
+ struct rds_ib_recv_work *recv;
- while (ib_poll_cq(cq, 1, &wc) > 0) {
+ while (ib_poll_cq(ic->i_recv_cq, 1, &wc) > 0) {
rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
(unsigned long long)wc.wr_id, wc.status, wc.byte_len,
be32_to_cpu(wc.ex.imm_data));
if (rds_conn_up(conn) || rds_conn_connecting(conn)) {
/* We expect errors as the qp is drained during shutdown */
if (wc.status == IB_WC_SUCCESS) {
- rds_ib_process_recv(conn, recv, wc.byte_len, &state);
+ rds_ib_process_recv(conn, recv, wc.byte_len, state);
} else {
rds_ib_conn_error(conn, "recv completion on "
"%pI4 had status %u, disconnecting and "
rds_ib_ring_free(&ic->i_recv_ring, 1);
}
+}
+
+void rds_ib_recv_tasklet_fn(unsigned long data)
+{
+ struct rds_ib_connection *ic = (struct rds_ib_connection *) data;
+ struct rds_connection *conn = ic->conn;
+ struct rds_ib_ack_state state = { 0, };
+
+ rds_poll_cq(ic, &state);
+ ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
+ rds_poll_cq(ic, &state);
if (state.ack_next_valid)
rds_ib_set_ack(ic, state.ack_next, state.ack_required);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff