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-rw-r--r--net/rds/ib.h28
-rw-r--r--net/rds/ib_cm.c70
-rw-r--r--net/rds/ib_recv.c136
-rw-r--r--net/rds/ib_stats.c3
4 files changed, 132 insertions, 105 deletions
diff --git a/net/rds/ib.h b/net/rds/ib.h
index f1fd5ffec4e1..727759b30579 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -24,6 +24,8 @@
#define RDS_IB_RECYCLE_BATCH_COUNT 32
+#define RDS_IB_WC_MAX 32
+
extern struct rw_semaphore rds_ib_devices_lock;
extern struct list_head rds_ib_devices;
@@ -89,6 +91,20 @@ struct rds_ib_work_ring {
atomic_t w_free_ctr;
};
+/* Rings are posted with all the allocations they'll need to queue the
+ * incoming message to the receiving socket so this can't fail.
+ * All fragments start with a header, so we can make sure we're not receiving
+ * garbage, and we can tell a small 8 byte fragment from an ACK frame.
+ */
+struct rds_ib_ack_state {
+ u64 ack_next;
+ u64 ack_recv;
+ unsigned int ack_required:1;
+ unsigned int ack_next_valid:1;
+ unsigned int ack_recv_valid:1;
+};
+
+
struct rds_ib_device;
struct rds_ib_connection {
@@ -102,6 +118,10 @@ struct rds_ib_connection {
struct ib_pd *i_pd;
struct ib_cq *i_send_cq;
struct ib_cq *i_recv_cq;
+ struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
+
+ /* interrupt handling */
+ struct tasklet_struct i_recv_tasklet;
/* tx */
struct rds_ib_work_ring i_send_ring;
@@ -112,7 +132,6 @@ struct rds_ib_connection {
atomic_t i_signaled_sends;
/* rx */
- struct tasklet_struct i_recv_tasklet;
struct mutex i_recv_mutex;
struct rds_ib_work_ring i_recv_ring;
struct rds_ib_incoming *i_ibinc;
@@ -199,13 +218,14 @@ struct rds_ib_statistics {
uint64_t s_ib_connect_raced;
uint64_t s_ib_listen_closed_stale;
uint64_t s_ib_tx_cq_call;
+ uint64_t s_ib_evt_handler_call;
+ uint64_t s_ib_tasklet_call;
uint64_t s_ib_tx_cq_event;
uint64_t s_ib_tx_ring_full;
uint64_t s_ib_tx_throttle;
uint64_t s_ib_tx_sg_mapping_failure;
uint64_t s_ib_tx_stalled;
uint64_t s_ib_tx_credit_updates;
- uint64_t s_ib_rx_cq_call;
uint64_t s_ib_rx_cq_event;
uint64_t s_ib_rx_ring_empty;
uint64_t s_ib_rx_refill_from_cq;
@@ -324,7 +344,8 @@ void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
void rds_ib_inc_free(struct rds_incoming *inc);
int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
-void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
+void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
+ struct rds_ib_ack_state *state);
void rds_ib_recv_tasklet_fn(unsigned long data);
void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
@@ -332,6 +353,7 @@ void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
void rds_ib_attempt_ack(struct rds_ib_connection *ic);
void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
+void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
/* ib_ring.c */
void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index 9043f5c04787..28e0979720b2 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -216,6 +216,72 @@ static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
event->event, ib_event_msg(event->event), data);
}
+/* Plucking the oldest entry from the ring can be done concurrently with
+ * the thread refilling the ring. Each ring operation is protected by
+ * spinlocks and the transient state of refilling doesn't change the
+ * recording of which entry is oldest.
+ *
+ * This relies on IB only calling one cq comp_handler for each cq so that
+ * there will only be one caller of rds_recv_incoming() per RDS connection.
+ */
+static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
+{
+ struct rds_connection *conn = context;
+ struct rds_ib_connection *ic = conn->c_transport_data;
+
+ rdsdebug("conn %p cq %p\n", conn, cq);
+
+ rds_ib_stats_inc(s_ib_evt_handler_call);
+
+ tasklet_schedule(&ic->i_recv_tasklet);
+}
+
+static void poll_cq(struct rds_ib_connection *ic, struct ib_cq *cq,
+ struct ib_wc *wcs,
+ struct rds_ib_ack_state *ack_state)
+{
+ int nr;
+ int i;
+ struct ib_wc *wc;
+
+ while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
+ for (i = 0; i < nr; i++) {
+ wc = wcs + i;
+ 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));
+ rds_ib_recv_cqe_handler(ic, wc, ack_state);
+ }
+ }
+}
+
+static void rds_ib_tasklet_fn_recv(unsigned long data)
+{
+ struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
+ struct rds_connection *conn = ic->conn;
+ struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
+ struct rds_ib_ack_state state;
+
+ BUG_ON(!rds_ibdev);
+
+ rds_ib_stats_inc(s_ib_tasklet_call);
+
+ memset(&state, 0, sizeof(state));
+ poll_cq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
+ ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
+ poll_cq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
+
+ if (state.ack_next_valid)
+ rds_ib_set_ack(ic, state.ack_next, state.ack_required);
+ if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
+ rds_send_drop_acked(conn, state.ack_recv, NULL);
+ ic->i_ack_recv = state.ack_recv;
+ }
+
+ if (rds_conn_up(conn))
+ rds_ib_attempt_ack(ic);
+}
+
static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
{
struct rds_connection *conn = data;
@@ -282,7 +348,7 @@ static int rds_ib_setup_qp(struct rds_connection *conn)
}
cq_attr.cqe = ic->i_recv_ring.w_nr;
- ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
+ ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
rds_ib_cq_event_handler, conn,
&cq_attr);
if (IS_ERR(ic->i_recv_cq)) {
@@ -743,7 +809,7 @@ int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
}
INIT_LIST_HEAD(&ic->ib_node);
- tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn,
+ tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
(unsigned long) ic);
mutex_init(&ic->i_recv_mutex);
#ifndef KERNEL_HAS_ATOMIC64
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c
index f43831e4186a..96744b75db93 100644
--- a/net/rds/ib_recv.c
+++ b/net/rds/ib_recv.c
@@ -596,8 +596,7 @@ void rds_ib_recv_init_ack(struct rds_ib_connection *ic)
* 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)
+void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required)
{
unsigned long flags;
@@ -622,8 +621,7 @@ static u64 rds_ib_get_ack(struct rds_ib_connection *ic)
return seq;
}
#else
-static void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq,
- int ack_required)
+void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required)
{
atomic64_set(&ic->i_ack_next, seq);
if (ack_required) {
@@ -830,20 +828,6 @@ static void rds_ib_cong_recv(struct rds_connection *conn,
rds_cong_map_updated(map, uncongested);
}
-/*
- * Rings are posted with all the allocations they'll need to queue the
- * incoming message to the receiving socket so this can't fail.
- * All fragments start with a header, so we can make sure we're not receiving
- * garbage, and we can tell a small 8 byte fragment from an ACK frame.
- */
-struct rds_ib_ack_state {
- u64 ack_next;
- u64 ack_recv;
- unsigned int ack_required:1;
- unsigned int ack_next_valid:1;
- unsigned int ack_recv_valid:1;
-};
-
static void rds_ib_process_recv(struct rds_connection *conn,
struct rds_ib_recv_work *recv, u32 data_len,
struct rds_ib_ack_state *state)
@@ -969,96 +953,50 @@ static void rds_ib_process_recv(struct rds_connection *conn,
}
}
-/*
- * Plucking the oldest entry from the ring can be done concurrently with
- * the thread refilling the ring. Each ring operation is protected by
- * spinlocks and the transient state of refilling doesn't change the
- * recording of which entry is oldest.
- *
- * This relies on IB only calling one cq comp_handler for each cq so that
- * there will only be one caller of rds_recv_incoming() per RDS connection.
- */
-void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context)
-{
- struct rds_connection *conn = context;
- struct rds_ib_connection *ic = conn->c_transport_data;
-
- rdsdebug("conn %p cq %p\n", conn, cq);
-
- rds_ib_stats_inc(s_ib_rx_cq_call);
-
- tasklet_schedule(&ic->i_recv_tasklet);
-}
-
-static inline void rds_poll_cq(struct rds_ib_connection *ic,
- struct rds_ib_ack_state *state)
+void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic,
+ struct ib_wc *wc,
+ 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(ic->i_recv_cq, 1, &wc) > 0) {
- rdsdebug("wc wr_id 0x%llx status %u (%s) byte_len %u imm_data %u\n",
- (unsigned long long)wc.wr_id, wc.status,
- ib_wc_status_msg(wc.status), wc.byte_len,
- be32_to_cpu(wc.ex.imm_data));
- rds_ib_stats_inc(s_ib_rx_cq_event);
+ rdsdebug("wc wr_id 0x%llx status %u (%s) byte_len %u imm_data %u\n",
+ (unsigned long long)wc->wr_id, wc->status,
+ ib_wc_status_msg(wc->status), wc->byte_len,
+ be32_to_cpu(wc->ex.imm_data));
- recv = &ic->i_recvs[rds_ib_ring_oldest(&ic->i_recv_ring)];
-
- ib_dma_unmap_sg(ic->i_cm_id->device, &recv->r_frag->f_sg, 1, DMA_FROM_DEVICE);
-
- /*
- * Also process recvs in connecting state because it is possible
- * to get a recv completion _before_ the rdmacm ESTABLISHED
- * event is processed.
- */
- if (wc.status == IB_WC_SUCCESS) {
- rds_ib_process_recv(conn, recv, wc.byte_len, state);
- } else {
- /* We expect errors as the qp is drained during shutdown */
- if (rds_conn_up(conn) || rds_conn_connecting(conn))
- rds_ib_conn_error(conn, "recv completion on %pI4 had "
- "status %u (%s), disconnecting and "
- "reconnecting\n", &conn->c_faddr,
- wc.status,
- ib_wc_status_msg(wc.status));
- }
+ rds_ib_stats_inc(s_ib_rx_cq_event);
+ recv = &ic->i_recvs[rds_ib_ring_oldest(&ic->i_recv_ring)];
+ ib_dma_unmap_sg(ic->i_cm_id->device, &recv->r_frag->f_sg, 1,
+ DMA_FROM_DEVICE);
- /*
- * rds_ib_process_recv() doesn't always consume the frag, and
- * we might not have called it at all if the wc didn't indicate
- * success. We already unmapped the frag's pages, though, and
- * the following rds_ib_ring_free() call tells the refill path
- * that it will not find an allocated frag here. Make sure we
- * keep that promise by freeing a frag that's still on the ring.
- */
- if (recv->r_frag) {
- rds_ib_frag_free(ic, recv->r_frag);
- recv->r_frag = NULL;
- }
- rds_ib_ring_free(&ic->i_recv_ring, 1);
+ /* Also process recvs in connecting state because it is possible
+ * to get a recv completion _before_ the rdmacm ESTABLISHED
+ * event is processed.
+ */
+ if (wc->status == IB_WC_SUCCESS) {
+ rds_ib_process_recv(conn, recv, wc->byte_len, state);
+ } else {
+ /* We expect errors as the qp is drained during shutdown */
+ if (rds_conn_up(conn) || rds_conn_connecting(conn))
+ rds_ib_conn_error(conn, "recv completion on %pI4 had status %u (%s), disconnecting and reconnecting\n",
+ &conn->c_faddr,
+ wc->status,
+ ib_wc_status_msg(wc->status));
}
-}
-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);
- if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
- rds_send_drop_acked(conn, state.ack_recv, NULL);
- ic->i_ack_recv = state.ack_recv;
+ /* rds_ib_process_recv() doesn't always consume the frag, and
+ * we might not have called it at all if the wc didn't indicate
+ * success. We already unmapped the frag's pages, though, and
+ * the following rds_ib_ring_free() call tells the refill path
+ * that it will not find an allocated frag here. Make sure we
+ * keep that promise by freeing a frag that's still on the ring.
+ */
+ if (recv->r_frag) {
+ rds_ib_frag_free(ic, recv->r_frag);
+ recv->r_frag = NULL;
}
- if (rds_conn_up(conn))
- rds_ib_attempt_ack(ic);
+ rds_ib_ring_free(&ic->i_recv_ring, 1);
/* If we ever end up with a really empty receive ring, we're
* in deep trouble, as the sender will definitely see RNR
diff --git a/net/rds/ib_stats.c b/net/rds/ib_stats.c
index 2d5965d6e97c..bdf6115ef6e1 100644
--- a/net/rds/ib_stats.c
+++ b/net/rds/ib_stats.c
@@ -42,14 +42,15 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
static const char *const rds_ib_stat_names[] = {
"ib_connect_raced",
"ib_listen_closed_stale",
+ "s_ib_evt_handler_call",
"ib_tx_cq_call",
+ "ib_tasklet_call",
"ib_tx_cq_event",
"ib_tx_ring_full",
"ib_tx_throttle",
"ib_tx_sg_mapping_failure",
"ib_tx_stalled",
"ib_tx_credit_updates",
- "ib_rx_cq_call",
"ib_rx_cq_event",
"ib_rx_ring_empty",
"ib_rx_refill_from_cq",
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-27 18:20:05 +0000