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Message-Id: <1496935647-29670-2-git-send-email-thomas.petazzoni@free-electrons.com>
Date: Thu, 8 Jun 2017 17:27:23 +0200
From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc: Marcin Wojtas <mw@...ihalf.com>,
Stefan Chulski <stefanc@...vell.com>,
Nadav Haklai <nadavh@...vell.com>,
Hanna Hawa <hannah@...vell.com>,
Yehuda Yitschak <yehuday@...vell.com>,
Antoine Tenart <antoine.tenart@...e-electrons.com>,
Gregory Clement <gregory.clement@...e-electrons.com>,
Markus Elfring <elfring@...rs.sourceforge.net>,
Marc Zyngier <marc.zyngier@....com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: [PATCH 1/5] net: mvpp2: remove mvpp2_bm_cookie_{build,pool_get}
This commit removes the useless remove
mvpp2_bm_cookie_{build,pool_get} functions. All what
mvpp2_bm_cookie_build() was doing is compute a 32-bit value by
concatenating the pool number and the CPU number... only to get the pool
number re-extracted by mvpp2_bm_cookie_pool_get() later on.
Instead, just get the pool number directly from RX descriptor status,
and pass it to mvpp2_pool_refill() and mvpp2_rx_refill().
This has the added benefit of dropping a smp_processor_id() call in a
migration-enabled context, which is wrong, and is the original
motivation for making this change.
Fixes: 3f518509dedc9 ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
---
drivers/net/ethernet/marvell/mvpp2.c | 51 ++++++++++--------------------------
1 file changed, 14 insertions(+), 37 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 9b875d7..cff45e3 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -666,10 +666,6 @@ enum mvpp2_prs_l3_cast {
#define MVPP2_BM_SWF_LONG_POOL(port) ((port > 2) ? 2 : port)
#define MVPP2_BM_SWF_SHORT_POOL 3
-/* BM cookie (32 bits) definition */
-#define MVPP2_BM_COOKIE_POOL_OFFS 8
-#define MVPP2_BM_COOKIE_CPU_OFFS 24
-
/* BM short pool packet size
* These value assure that for SWF the total number
* of bytes allocated for each buffer will be 512
@@ -3920,12 +3916,6 @@ static inline u32 mvpp2_bm_cookie_pool_set(u32 cookie, int pool)
return bm;
}
-/* Get pool number from a BM cookie */
-static inline int mvpp2_bm_cookie_pool_get(unsigned long cookie)
-{
- return (cookie >> MVPP2_BM_COOKIE_POOL_OFFS) & 0xFF;
-}
-
/* Release buffer to BM */
static inline void mvpp2_bm_pool_put(struct mvpp2_port *port, int pool,
dma_addr_t buf_dma_addr,
@@ -3961,12 +3951,10 @@ static inline void mvpp2_bm_pool_put(struct mvpp2_port *port, int pool,
}
/* Refill BM pool */
-static void mvpp2_pool_refill(struct mvpp2_port *port, u32 bm,
+static void mvpp2_pool_refill(struct mvpp2_port *port, int pool,
dma_addr_t dma_addr,
phys_addr_t phys_addr)
{
- int pool = mvpp2_bm_cookie_pool_get(bm);
-
mvpp2_bm_pool_put(port, pool, dma_addr, phys_addr);
}
@@ -4515,21 +4503,6 @@ static void mvpp2_rxq_offset_set(struct mvpp2_port *port,
mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(prxq), val);
}
-/* Obtain BM cookie information from descriptor */
-static u32 mvpp2_bm_cookie_build(struct mvpp2_port *port,
- struct mvpp2_rx_desc *rx_desc)
-{
- int cpu = smp_processor_id();
- int pool;
-
- pool = (mvpp2_rxdesc_status_get(port, rx_desc) &
- MVPP2_RXD_BM_POOL_ID_MASK) >>
- MVPP2_RXD_BM_POOL_ID_OFFS;
-
- return ((pool & 0xFF) << MVPP2_BM_COOKIE_POOL_OFFS) |
- ((cpu & 0xFF) << MVPP2_BM_COOKIE_CPU_OFFS);
-}
-
/* Tx descriptors helper methods */
/* Get pointer to next Tx descriptor to be processed (send) by HW */
@@ -4980,9 +4953,13 @@ static void mvpp2_rxq_drop_pkts(struct mvpp2_port *port,
for (i = 0; i < rx_received; i++) {
struct mvpp2_rx_desc *rx_desc = mvpp2_rxq_next_desc_get(rxq);
- u32 bm = mvpp2_bm_cookie_build(port, rx_desc);
+ u32 status = mvpp2_rxdesc_status_get(port, rx_desc);
+ int pool;
+
+ pool = (status & MVPP2_RXD_BM_POOL_ID_MASK) >>
+ MVPP2_RXD_BM_POOL_ID_OFFS;
- mvpp2_pool_refill(port, bm,
+ mvpp2_pool_refill(port, pool,
mvpp2_rxdesc_dma_addr_get(port, rx_desc),
mvpp2_rxdesc_cookie_get(port, rx_desc));
}
@@ -5420,7 +5397,7 @@ static void mvpp2_rx_csum(struct mvpp2_port *port, u32 status,
/* Reuse skb if possible, or allocate a new skb and add it to BM pool */
static int mvpp2_rx_refill(struct mvpp2_port *port,
- struct mvpp2_bm_pool *bm_pool, u32 bm)
+ struct mvpp2_bm_pool *bm_pool, int pool)
{
dma_addr_t dma_addr;
phys_addr_t phys_addr;
@@ -5432,7 +5409,7 @@ static int mvpp2_rx_refill(struct mvpp2_port *port,
if (!buf)
return -ENOMEM;
- mvpp2_pool_refill(port, bm, dma_addr, phys_addr);
+ mvpp2_pool_refill(port, pool, dma_addr, phys_addr);
return 0;
}
@@ -5490,7 +5467,7 @@ static int mvpp2_rx(struct mvpp2_port *port, int rx_todo,
unsigned int frag_size;
dma_addr_t dma_addr;
phys_addr_t phys_addr;
- u32 bm, rx_status;
+ u32 rx_status;
int pool, rx_bytes, err;
void *data;
@@ -5502,8 +5479,8 @@ static int mvpp2_rx(struct mvpp2_port *port, int rx_todo,
phys_addr = mvpp2_rxdesc_cookie_get(port, rx_desc);
data = (void *)phys_to_virt(phys_addr);
- bm = mvpp2_bm_cookie_build(port, rx_desc);
- pool = mvpp2_bm_cookie_pool_get(bm);
+ pool = (rx_status & MVPP2_RXD_BM_POOL_ID_MASK) >>
+ MVPP2_RXD_BM_POOL_ID_OFFS;
bm_pool = &port->priv->bm_pools[pool];
/* In case of an error, release the requested buffer pointer
@@ -5516,7 +5493,7 @@ static int mvpp2_rx(struct mvpp2_port *port, int rx_todo,
dev->stats.rx_errors++;
mvpp2_rx_error(port, rx_desc);
/* Return the buffer to the pool */
- mvpp2_pool_refill(port, bm, dma_addr, phys_addr);
+ mvpp2_pool_refill(port, pool, dma_addr, phys_addr);
continue;
}
@@ -5531,7 +5508,7 @@ static int mvpp2_rx(struct mvpp2_port *port, int rx_todo,
goto err_drop_frame;
}
- err = mvpp2_rx_refill(port, bm_pool, bm);
+ err = mvpp2_rx_refill(port, bm_pool, pool);
if (err) {
netdev_err(port->dev, "failed to refill BM pools\n");
goto err_drop_frame;
--
2.7.4
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