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net: systemport: Remove need for DMA descriptor

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All we do is write the length/status and address bits to a DMA
descriptor only to write its contents into on-chip registers right
after, eliminate this unnecessary step.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli
2019-04-22 09:46:44 -07:00
committed by David S. Miller
parent 697cd36cda
commit 7e6e185c74
2 changed files with 8 additions and 58 deletions
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10
drivers/net/ethernet/broadcom/bcmsysport.h
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@@ -516,12 +516,6 @@ struct bcm_rsb {
#define TDMA_DEBUG 0x64c
/* Transmit/Receive descriptor */
struct dma_desc {
u32 addr_status_len;
u32 addr_lo;
};
/* Number of Receive hardware descriptor words */
#define SP_NUM_HW_RX_DESC_WORDS 1024
#define SP_LT_NUM_HW_RX_DESC_WORDS 256
@@ -530,7 +524,7 @@ struct dma_desc {
#define SP_NUM_TX_DESC 1536
#define SP_LT_NUM_TX_DESC 256
#define WORDS_PER_DESC (sizeof(struct dma_desc) / sizeof(u32))
#define WORDS_PER_DESC 2
/* Rx/Tx common counter group.*/
struct bcm_sysport_pkt_counters {
@@ -718,7 +712,6 @@ struct bcm_sysport_net_dim {
struct bcm_sysport_tx_ring {
spinlock_t lock; /* Ring lock for tx reclaim/xmit */
struct napi_struct napi; /* NAPI per tx queue */
dma_addr_t desc_dma; /* DMA cookie */
unsigned int index; /* Ring index */
unsigned int size; /* Ring current size */
unsigned int alloc_size; /* Ring one-time allocated size */
@@ -727,7 +720,6 @@ struct bcm_sysport_tx_ring {
unsigned int c_index; /* Last consumer index */
unsigned int clean_index; /* Current clean index */
struct bcm_sysport_cb *cbs; /* Transmit control blocks */
struct dma_desc *desc_cpu; /* CPU view of the descriptor */
struct bcm_sysport_priv *priv; /* private context backpointer */
unsigned long packets; /* packets statistics */
unsigned long bytes; /* bytes statistics */