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Date: Thu, 02 Feb 2017 11:44:27 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Ganesh Goudar <ganeshgr@...lsio.com>
Subject: [PATCH net-next] cxgb4: get rid of custom busy poll code
From: Eric Dumazet <edumazet@...gle.com>
In linux-4.5, busy polling was implemented in core
NAPI stack, meaning that all custom implementation can
be removed from drivers.
Not only we remove lot of code, we also remove one spin_lock()
from driver fast path.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Ganesh Goudar <ganeshgr@...lsio.com>
---
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h | 113 --------------
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 16 -
drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c | 12 -
drivers/net/ethernet/chelsio/cxgb4/sge.c | 39 ----
4 files changed, 6 insertions(+), 174 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
index ccb455f14d08b94542252287f48ce24f81e5c4ab..163543b1ea0bf1bec215f0613a6bce2a729fa337 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
@@ -586,22 +586,6 @@ struct sge_rspq { /* state for an SGE response queue */
rspq_handler_t handler;
rspq_flush_handler_t flush_handler;
struct t4_lro_mgr lro_mgr;
-#ifdef CONFIG_NET_RX_BUSY_POLL
-#define CXGB_POLL_STATE_IDLE 0
-#define CXGB_POLL_STATE_NAPI BIT(0) /* NAPI owns this poll */
-#define CXGB_POLL_STATE_POLL BIT(1) /* poll owns this poll */
-#define CXGB_POLL_STATE_NAPI_YIELD BIT(2) /* NAPI yielded this poll */
-#define CXGB_POLL_STATE_POLL_YIELD BIT(3) /* poll yielded this poll */
-#define CXGB_POLL_YIELD (CXGB_POLL_STATE_NAPI_YIELD | \
- CXGB_POLL_STATE_POLL_YIELD)
-#define CXGB_POLL_LOCKED (CXGB_POLL_STATE_NAPI | \
- CXGB_POLL_STATE_POLL)
-#define CXGB_POLL_USER_PEND (CXGB_POLL_STATE_POLL | \
- CXGB_POLL_STATE_POLL_YIELD)
- unsigned int bpoll_state;
- spinlock_t bpoll_lock; /* lock for busy poll */
-#endif /* CONFIG_NET_RX_BUSY_POLL */
-
};
struct sge_eth_stats { /* Ethernet queue statistics */
@@ -1173,102 +1157,6 @@ static inline struct adapter *netdev2adap(const struct net_device *dev)
return netdev2pinfo(dev)->adapter;
}
-#ifdef CONFIG_NET_RX_BUSY_POLL
-static inline void cxgb_busy_poll_init_lock(struct sge_rspq *q)
-{
- spin_lock_init(&q->bpoll_lock);
- q->bpoll_state = CXGB_POLL_STATE_IDLE;
-}
-
-static inline bool cxgb_poll_lock_napi(struct sge_rspq *q)
-{
- bool rc = true;
-
- spin_lock(&q->bpoll_lock);
- if (q->bpoll_state & CXGB_POLL_LOCKED) {
- q->bpoll_state |= CXGB_POLL_STATE_NAPI_YIELD;
- rc = false;
- } else {
- q->bpoll_state = CXGB_POLL_STATE_NAPI;
- }
- spin_unlock(&q->bpoll_lock);
- return rc;
-}
-
-static inline bool cxgb_poll_unlock_napi(struct sge_rspq *q)
-{
- bool rc = false;
-
- spin_lock(&q->bpoll_lock);
- if (q->bpoll_state & CXGB_POLL_STATE_POLL_YIELD)
- rc = true;
- q->bpoll_state = CXGB_POLL_STATE_IDLE;
- spin_unlock(&q->bpoll_lock);
- return rc;
-}
-
-static inline bool cxgb_poll_lock_poll(struct sge_rspq *q)
-{
- bool rc = true;
-
- spin_lock_bh(&q->bpoll_lock);
- if (q->bpoll_state & CXGB_POLL_LOCKED) {
- q->bpoll_state |= CXGB_POLL_STATE_POLL_YIELD;
- rc = false;
- } else {
- q->bpoll_state |= CXGB_POLL_STATE_POLL;
- }
- spin_unlock_bh(&q->bpoll_lock);
- return rc;
-}
-
-static inline bool cxgb_poll_unlock_poll(struct sge_rspq *q)
-{
- bool rc = false;
-
- spin_lock_bh(&q->bpoll_lock);
- if (q->bpoll_state & CXGB_POLL_STATE_POLL_YIELD)
- rc = true;
- q->bpoll_state = CXGB_POLL_STATE_IDLE;
- spin_unlock_bh(&q->bpoll_lock);
- return rc;
-}
-
-static inline bool cxgb_poll_busy_polling(struct sge_rspq *q)
-{
- return q->bpoll_state & CXGB_POLL_USER_PEND;
-}
-#else
-static inline void cxgb_busy_poll_init_lock(struct sge_rspq *q)
-{
-}
-
-static inline bool cxgb_poll_lock_napi(struct sge_rspq *q)
-{
- return true;
-}
-
-static inline bool cxgb_poll_unlock_napi(struct sge_rspq *q)
-{
- return false;
-}
-
-static inline bool cxgb_poll_lock_poll(struct sge_rspq *q)
-{
- return false;
-}
-
-static inline bool cxgb_poll_unlock_poll(struct sge_rspq *q)
-{
- return false;
-}
-
-static inline bool cxgb_poll_busy_polling(struct sge_rspq *q)
-{
- return false;
-}
-#endif /* CONFIG_NET_RX_BUSY_POLL */
-
/* Return a version number to identify the type of adapter. The scheme is:
* - bits 0..9: chip version
* - bits 10..15: chip revision
@@ -1325,7 +1213,6 @@ irqreturn_t t4_sge_intr_msix(int irq, void *cookie);
int t4_sge_init(struct adapter *adap);
void t4_sge_start(struct adapter *adap);
void t4_sge_stop(struct adapter *adap);
-int cxgb_busy_poll(struct napi_struct *napi);
void cxgb4_set_ethtool_ops(struct net_device *netdev);
int cxgb4_write_rss(const struct port_info *pi, const u16 *queues);
extern int dbfifo_int_thresh;
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 49e000ebd2b9ce14a26d4b1d9dcaec9cb360d8b9..f4f569060689c833a320c1d854e125278420ac89 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -744,14 +744,8 @@ static void quiesce_rx(struct adapter *adap)
for (i = 0; i < adap->sge.ingr_sz; i++) {
struct sge_rspq *q = adap->sge.ingr_map[i];
- if (q && q->handler) {
+ if (q && q->handler)
napi_disable(&q->napi);
- local_bh_disable();
- while (!cxgb_poll_lock_napi(q))
- mdelay(1);
- local_bh_enable();
- }
-
}
}
@@ -782,10 +776,9 @@ static void enable_rx(struct adapter *adap)
if (!q)
continue;
- if (q->handler) {
- cxgb_busy_poll_init_lock(q);
+ if (q->handler)
napi_enable(&q->napi);
- }
+
/* 0-increment GTS to start the timer and enable interrupts */
t4_write_reg(adap, MYPF_REG(SGE_PF_GTS_A),
SEINTARM_V(q->intr_params) |
@@ -2763,9 +2756,6 @@ static const struct net_device_ops cxgb4_netdev_ops = {
.ndo_fcoe_enable = cxgb_fcoe_enable,
.ndo_fcoe_disable = cxgb_fcoe_disable,
#endif /* CONFIG_CHELSIO_T4_FCOE */
-#ifdef CONFIG_NET_RX_BUSY_POLL
- .ndo_busy_poll = cxgb_busy_poll,
-#endif
.ndo_set_tx_maxrate = cxgb_set_tx_maxrate,
.ndo_setup_tc = cxgb_setup_tc,
};
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
index 8098902c094a1d6e9e340dfbd54102079823e488..36105b6837cbc0adf5a78b47ac286840517f0145 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
@@ -408,10 +408,9 @@ static void enable_rx(struct adapter *adap, struct sge_rspq *q)
if (!q)
return;
- if (q->handler) {
- cxgb_busy_poll_init_lock(q);
+ if (q->handler)
napi_enable(&q->napi);
- }
+
/* 0-increment GTS to start the timer and enable interrupts */
t4_write_reg(adap, MYPF_REG(SGE_PF_GTS_A),
SEINTARM_V(q->intr_params) |
@@ -420,13 +419,8 @@ static void enable_rx(struct adapter *adap, struct sge_rspq *q)
static void quiesce_rx(struct adapter *adap, struct sge_rspq *q)
{
- if (q && q->handler) {
+ if (q && q->handler)
napi_disable(&q->napi);
- local_bh_disable();
- while (!cxgb_poll_lock_napi(q))
- mdelay(1);
- local_bh_enable();
- }
}
static void enable_rx_uld(struct adapter *adap, unsigned int uld_type)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 0fe04b482c382cf1e0c4333fe371d6a5e3efa6e1..85d30b33151ffc83ece3d731f8084110b56bb131 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -43,9 +43,7 @@
#include <linux/export.h>
#include <net/ipv6.h>
#include <net/tcp.h>
-#ifdef CONFIG_NET_RX_BUSY_POLL
#include <net/busy_poll.h>
-#endif /* CONFIG_NET_RX_BUSY_POLL */
#ifdef CONFIG_CHELSIO_T4_FCOE
#include <scsi/fc/fc_fcoe.h>
#endif /* CONFIG_CHELSIO_T4_FCOE */
@@ -2054,7 +2052,6 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
csum_ok = pkt->csum_calc && !err_vec &&
(q->netdev->features & NETIF_F_RXCSUM);
if ((pkt->l2info & htonl(RXF_TCP_F)) &&
- !(cxgb_poll_busy_polling(q)) &&
(q->netdev->features & NETIF_F_GRO) && csum_ok && !pkt->ip_frag) {
do_gro(rxq, si, pkt);
return 0;
@@ -2285,38 +2282,6 @@ static int process_responses(struct sge_rspq *q, int budget)
return budget - budget_left;
}
-#ifdef CONFIG_NET_RX_BUSY_POLL
-int cxgb_busy_poll(struct napi_struct *napi)
-{
- struct sge_rspq *q = container_of(napi, struct sge_rspq, napi);
- unsigned int params, work_done;
- u32 val;
-
- if (!cxgb_poll_lock_poll(q))
- return LL_FLUSH_BUSY;
-
- work_done = process_responses(q, 4);
- params = QINTR_TIMER_IDX_V(TIMERREG_COUNTER0_X) | QINTR_CNT_EN_V(1);
- q->next_intr_params = params;
- val = CIDXINC_V(work_done) | SEINTARM_V(params);
-
- /* If we don't have access to the new User GTS (T5+), use the old
- * doorbell mechanism; otherwise use the new BAR2 mechanism.
- */
- if (unlikely(!q->bar2_addr))
- t4_write_reg(q->adap, MYPF_REG(SGE_PF_GTS_A),
- val | INGRESSQID_V((u32)q->cntxt_id));
- else {
- writel(val | INGRESSQID_V(q->bar2_qid),
- q->bar2_addr + SGE_UDB_GTS);
- wmb();
- }
-
- cxgb_poll_unlock_poll(q);
- return work_done;
-}
-#endif /* CONFIG_NET_RX_BUSY_POLL */
-
/**
* napi_rx_handler - the NAPI handler for Rx processing
* @napi: the napi instance
@@ -2335,9 +2300,6 @@ static int napi_rx_handler(struct napi_struct *napi, int budget)
int work_done;
u32 val;
- if (!cxgb_poll_lock_napi(q))
- return budget;
-
work_done = process_responses(q, budget);
if (likely(work_done < budget)) {
int timer_index;
@@ -2377,7 +2339,6 @@ static int napi_rx_handler(struct napi_struct *napi, int budget)
q->bar2_addr + SGE_UDB_GTS);
wmb();
}
- cxgb_poll_unlock_napi(q);
return work_done;
}
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