sfc: Remove falcon deadcode

ef4_farch_dimension_resources(), ef4_nic_fix_nodesc_drop_stat(),
ef4_ticks_to_usecs() and ef4_tx_get_copy_buffer_limited() were
copied over from efx_ equivalents in 2016 but never used by
commit 5a6681e ("sfc: separate out SFC4000 ("Falcon") support into new
sfc-falcon driver")

EF4_MAX_FLUSH_TIME is also unused.

Remove them.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://patch.msgid.link/20241102151625.39535-2-linux@treblig.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Dr. David Alan Gilbert

drivers/net/ethernet/sfc/falcon/efx.c

@@ -1886,14 +1886,6 @@ unsigned int ef4_usecs_to_ticks(struct ef4_nic *efx, unsigned int usecs)
 	return usecs * 1000 / efx->timer_quantum_ns;
 }
 
-unsigned int ef4_ticks_to_usecs(struct ef4_nic *efx, unsigned int ticks)
-{
-	/* We must round up when converting ticks to microseconds
-	 * because we round down when converting the other way.
-	 */
-	return DIV_ROUND_UP(ticks * efx->timer_quantum_ns, 1000);
-}
-
 /* Set interrupt moderation parameters */
 int ef4_init_irq_moderation(struct ef4_nic *efx, unsigned int tx_usecs,
 			    unsigned int rx_usecs, bool rx_adaptive,

drivers/net/ethernet/sfc/falcon/efx.h

@@ -198,7 +198,6 @@ int ef4_try_recovery(struct ef4_nic *efx);
 /* Global */
 void ef4_schedule_reset(struct ef4_nic *efx, enum reset_type type);
 unsigned int ef4_usecs_to_ticks(struct ef4_nic *efx, unsigned int usecs);
-unsigned int ef4_ticks_to_usecs(struct ef4_nic *efx, unsigned int ticks);
 int ef4_init_irq_moderation(struct ef4_nic *efx, unsigned int tx_usecs,
 			    unsigned int rx_usecs, bool rx_adaptive,
 			    bool rx_may_override_tx);

drivers/net/ethernet/sfc/falcon/farch.c

@@ -1631,28 +1631,6 @@ void ef4_farch_rx_push_indir_table(struct ef4_nic *efx)
 	}
 }
 
-/* Looks at available SRAM resources and works out how many queues we
- * can support, and where things like descriptor caches should live.
- *
- * SRAM is split up as follows:
- * 0                          buftbl entries for channels
- * efx->vf_buftbl_base        buftbl entries for SR-IOV
- * efx->rx_dc_base            RX descriptor caches
- * efx->tx_dc_base            TX descriptor caches
- */
-void ef4_farch_dimension_resources(struct ef4_nic *efx, unsigned sram_lim_qw)
-{
-	unsigned vi_count;
-
-	/* Account for the buffer table entries backing the datapath channels
-	 * and the descriptor caches for those channels.
-	 */
-	vi_count = max(efx->n_channels, efx->n_tx_channels * EF4_TXQ_TYPES);
-
-	efx->tx_dc_base = sram_lim_qw - vi_count * TX_DC_ENTRIES;
-	efx->rx_dc_base = efx->tx_dc_base - vi_count * RX_DC_ENTRIES;
-}
-
 u32 ef4_farch_fpga_ver(struct ef4_nic *efx)
 {
 	ef4_oword_t altera_build;

drivers/net/ethernet/sfc/falcon/nic.c

@@ -511,14 +511,3 @@ void ef4_nic_update_stats(const struct ef4_hw_stat_desc *desc, size_t count,
 		}
 	}
 }
-
-void ef4_nic_fix_nodesc_drop_stat(struct ef4_nic *efx, u64 *rx_nodesc_drops)
-{
-	/* if down, or this is the first update after coming up */
-	if (!(efx->net_dev->flags & IFF_UP) || !efx->rx_nodesc_drops_prev_state)
-		efx->rx_nodesc_drops_while_down +=
-			*rx_nodesc_drops - efx->rx_nodesc_drops_total;
-	efx->rx_nodesc_drops_total = *rx_nodesc_drops;
-	efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP);
-	*rx_nodesc_drops -= efx->rx_nodesc_drops_while_down;
-}

drivers/net/ethernet/sfc/falcon/nic.h

@@ -477,7 +477,6 @@ void ef4_farch_finish_flr(struct ef4_nic *efx);
 void falcon_start_nic_stats(struct ef4_nic *efx);
 void falcon_stop_nic_stats(struct ef4_nic *efx);
 int falcon_reset_xaui(struct ef4_nic *efx);
-void ef4_farch_dimension_resources(struct ef4_nic *efx, unsigned sram_lim_qw);
 void ef4_farch_init_common(struct ef4_nic *efx);
 void ef4_farch_rx_push_indir_table(struct ef4_nic *efx);
 
@@ -502,10 +501,6 @@ size_t ef4_nic_describe_stats(const struct ef4_hw_stat_desc *desc, size_t count,
 void ef4_nic_update_stats(const struct ef4_hw_stat_desc *desc, size_t count,
 			  const unsigned long *mask, u64 *stats,
 			  const void *dma_buf, bool accumulate);
-void ef4_nic_fix_nodesc_drop_stat(struct ef4_nic *efx, u64 *stat);
-
-#define EF4_MAX_FLUSH_TIME 5000
-
 void ef4_farch_generate_event(struct ef4_nic *efx, unsigned int evq,
 			      ef4_qword_t *event);
 

drivers/net/ethernet/sfc/falcon/tx.c

@@ -40,14 +40,6 @@ static inline u8 *ef4_tx_get_copy_buffer(struct ef4_tx_queue *tx_queue,
 	return (u8 *)page_buf->addr + offset;
 }
 
-u8 *ef4_tx_get_copy_buffer_limited(struct ef4_tx_queue *tx_queue,
-				   struct ef4_tx_buffer *buffer, size_t len)
-{
-	if (len > EF4_TX_CB_SIZE)
-		return NULL;
-	return ef4_tx_get_copy_buffer(tx_queue, buffer);
-}
-
 static void ef4_dequeue_buffer(struct ef4_tx_queue *tx_queue,
 			       struct ef4_tx_buffer *buffer,
 			       unsigned int *pkts_compl,

drivers/net/ethernet/sfc/falcon/tx.h

@@ -15,9 +15,6 @@
 unsigned int ef4_tx_limit_len(struct ef4_tx_queue *tx_queue,
 			      dma_addr_t dma_addr, unsigned int len);
 
-u8 *ef4_tx_get_copy_buffer_limited(struct ef4_tx_queue *tx_queue,
-				   struct ef4_tx_buffer *buffer, size_t len);
-
 int ef4_enqueue_skb_tso(struct ef4_tx_queue *tx_queue, struct sk_buff *skb,
 			bool *data_mapped);