Add the infrastructure to enable zero-copy transmits. This is currently a no-op as the SPI or SDIO drivers will need to implement hif_sk_buffs_tx to take advantage of this. Signed-off-by: David Mosberger-Tang <davidm@xxxxxxxxxx> --- .../net/wireless/microchip/wilc1000/wlan.c | 43 ++++++++++++++++++- .../net/wireless/microchip/wilc1000/wlan.h | 2 + 2 files changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.c b/drivers/net/wireless/microchip/wilc1000/wlan.c index 08f3e96bf72cf..d96a7e2a0bd59 100644 --- a/drivers/net/wireless/microchip/wilc1000/wlan.c +++ b/drivers/net/wireless/microchip/wilc1000/wlan.c @@ -935,6 +935,44 @@ static int copy_and_send_packets(struct wilc *wilc, int entries) return ret; } +/** + * zero_copy_send_packets() - send packets to the chip (copy-free). + * @wilc: Pointer to the wilc structure. + * @entries: The number of packets to send from the VMM table. + * + * Zero-copy version of sending the packets in the VMM table to the + * chip. + * + * Context: The wilc1000 bus must have been released but the chip + * must be awake. + * + * Return: Negative number on error, 0 on success. + */ +static int zero_copy_send_packets(struct wilc *wilc, int entries) +{ + const struct wilc_hif_func *func = wilc->hif_func; + struct wilc_skb_tx_cb *tx_cb; + struct sk_buff *tqe; + int ret, i = 0; + + acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY); + + ret = func->hif_clear_int_ext(wilc, ENABLE_TX_VMM); + if (ret == 0) + ret = func->hif_sk_buffs_tx(wilc, 0, entries, &wilc->chipq); + + release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP); + + for (i = 0; i < entries; ++i) { + tqe = __skb_dequeue(&wilc->chipq); + tx_cb = WILC_SKB_TX_CB(tqe); + wilc->fw[tx_cb->q_num].count++; + wilc->chipq_bytes -= tqe->len; + wilc_wlan_tx_packet_done(tqe, ret == 0); + } + return ret; +} + int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count) { int vmm_table_len, entries; @@ -966,7 +1004,10 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count) if (entries <= 0) { ret = entries; } else { - ret = copy_and_send_packets(wilc, entries); + if (wilc->hif_func->hif_sk_buffs_tx) + ret = zero_copy_send_packets(wilc, entries); + else + ret = copy_and_send_packets(wilc, entries); } if (ret >= 0 && entries < vmm_table_len) ret = WILC_VMM_ENTRY_FULL_RETRY; diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.h b/drivers/net/wireless/microchip/wilc1000/wlan.h index 11a54320ffd05..bda31f0970bda 100644 --- a/drivers/net/wireless/microchip/wilc1000/wlan.h +++ b/drivers/net/wireless/microchip/wilc1000/wlan.h @@ -367,6 +367,8 @@ struct wilc_hif_func { int (*hif_read_size)(struct wilc *wilc, u32 *size); int (*hif_block_tx_ext)(struct wilc *wilc, u32 addr, u8 *buf, u32 size); int (*hif_block_rx_ext)(struct wilc *wilc, u32 addr, u8 *buf, u32 size); + int (*hif_sk_buffs_tx)(struct wilc *wilc, u32 addr, + size_t num_skbs, struct sk_buff_head *skbs); int (*hif_sync_ext)(struct wilc *wilc, int nint); int (*enable_interrupt)(struct wilc *nic); void (*disable_interrupt)(struct wilc *nic); -- 2.25.1