sfc: Cleanup RX event processing
Make efx_process_channel() and falcon_process_eventq() return the
number of packets received rather than updating the quota, consistent
with new NAPI.
Since channels and RX queues are mapped one-to-one, remove return
value from falcon_handle_rx_event() and add a warning for events
with the wrong RX queue number.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index 7b1c387..96cb5d0 100644
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -952,10 +952,10 @@
* Also "is multicast" and "matches multicast filter" flags can be used to
* discard non-matching multicast packets.
*/
-static int falcon_handle_rx_event(struct efx_channel *channel,
- const efx_qword_t *event)
+static void falcon_handle_rx_event(struct efx_channel *channel,
+ const efx_qword_t *event)
{
- unsigned int rx_ev_q_label, rx_ev_desc_ptr, rx_ev_byte_cnt;
+ unsigned int rx_ev_desc_ptr, rx_ev_byte_cnt;
unsigned int rx_ev_hdr_type, rx_ev_mcast_pkt;
unsigned expected_ptr;
bool rx_ev_pkt_ok, discard = false, checksummed;
@@ -968,16 +968,14 @@
rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE);
WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_JUMBO_CONT));
WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_SOP) != 1);
+ WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_Q_LABEL) != channel->channel);
- rx_ev_q_label = EFX_QWORD_FIELD(*event, RX_EV_Q_LABEL);
- rx_queue = &efx->rx_queue[rx_ev_q_label];
+ rx_queue = &efx->rx_queue[channel->channel];
rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR);
expected_ptr = rx_queue->removed_count & FALCON_RXD_RING_MASK;
- if (unlikely(rx_ev_desc_ptr != expected_ptr)) {
+ if (unlikely(rx_ev_desc_ptr != expected_ptr))
falcon_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);
- return rx_ev_q_label;
- }
if (likely(rx_ev_pkt_ok)) {
/* If packet is marked as OK and packet type is TCP/IPv4 or
@@ -1003,8 +1001,6 @@
/* Handle received packet */
efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt,
checksummed, discard);
-
- return rx_ev_q_label;
}
/* Global events are basically PHY events */
@@ -1109,13 +1105,12 @@
}
}
-int falcon_process_eventq(struct efx_channel *channel, int *rx_quota)
+int falcon_process_eventq(struct efx_channel *channel, int rx_quota)
{
unsigned int read_ptr;
efx_qword_t event, *p_event;
int ev_code;
- int rxq;
- int rxdmaqs = 0;
+ int rx_packets = 0;
read_ptr = channel->eventq_read_ptr;
@@ -1137,9 +1132,8 @@
switch (ev_code) {
case RX_IP_EV_DECODE:
- rxq = falcon_handle_rx_event(channel, &event);
- rxdmaqs |= (1 << rxq);
- (*rx_quota)--;
+ falcon_handle_rx_event(channel, &event);
+ ++rx_packets;
break;
case TX_IP_EV_DECODE:
falcon_handle_tx_event(channel, &event);
@@ -1166,10 +1160,10 @@
/* Increment read pointer */
read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
- } while (*rx_quota);
+ } while (rx_packets < rx_quota);
channel->eventq_read_ptr = read_ptr;
- return rxdmaqs;
+ return rx_packets;
}
void falcon_set_int_moderation(struct efx_channel *channel)