From: Jon Cooper Date: Thu, 18 Oct 2012 14:49:54 +0000 (+0100) Subject: sfc: Generalise packet hash lookup to support EF10 RX prefix X-Git-Tag: v3.12-rc1~132^2~104^2~20 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=43a3739d559f02cb00d92a51d8f2a7d294a1b5e5;p=kernel%2Fkernel-generic.git sfc: Generalise packet hash lookup to support EF10 RX prefix EF10 uses an entirely different RX prefix format from Falcon-arch. Extend struct efx_nic_type to describe this. [bwh: Also replace the magic numbers used for the Falcon-arch RX prefix] Signed-off-by: Ben Hutchings --- diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 3af28a8..db2f119 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -573,7 +573,7 @@ static void efx_start_datapath(struct efx_nic *efx) * support the current MTU, including padding for header * alignment and overruns. */ - efx->rx_dma_len = (efx->type->rx_buffer_hash_size + + efx->rx_dma_len = (efx->rx_prefix_size + EFX_MAX_FRAME_LEN(efx->net_dev->mtu) + efx->type->rx_buffer_padding); rx_buf_len = (sizeof(struct efx_rx_page_state) + @@ -2456,6 +2456,9 @@ static int efx_init_struct(struct efx_nic *efx, strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name)); efx->net_dev = net_dev; + efx->rx_prefix_size = efx->type->rx_prefix_size; + efx->rx_packet_hash_offset = + efx->type->rx_hash_offset - efx->type->rx_prefix_size; spin_lock_init(&efx->stats_lock); mutex_init(&efx->mac_lock); efx->phy_op = &efx_dummy_phy_operations; diff --git a/drivers/net/ethernet/sfc/falcon.c b/drivers/net/ethernet/sfc/falcon.c index 1140b83..ec77611 100644 --- a/drivers/net/ethernet/sfc/falcon.c +++ b/drivers/net/ethernet/sfc/falcon.c @@ -2827,7 +2827,8 @@ const struct efx_nic_type falcon_b0_nic_type = { .evq_ptr_tbl_base = FR_BZ_EVQ_PTR_TBL, .evq_rptr_tbl_base = FR_BZ_EVQ_RPTR, .max_dma_mask = DMA_BIT_MASK(FSF_AZ_TX_KER_BUF_ADDR_WIDTH), - .rx_buffer_hash_size = 0x10, + .rx_prefix_size = FS_BZ_RX_PREFIX_SIZE, + .rx_hash_offset = FS_BZ_RX_PREFIX_HASH_OFST, .rx_buffer_padding = 0, .can_rx_scatter = true, .max_interrupt_mode = EFX_INT_MODE_MSIX, diff --git a/drivers/net/ethernet/sfc/farch_regs.h b/drivers/net/ethernet/sfc/farch_regs.h index 00ef17a..491b103 100644 --- a/drivers/net/ethernet/sfc/farch_regs.h +++ b/drivers/net/ethernet/sfc/farch_regs.h @@ -2925,4 +2925,8 @@ #define FSF_AZ_DRV_GEN_EV_MAGIC_LBN 0 #define FSF_AZ_DRV_GEN_EV_MAGIC_WIDTH 32 +/* RX packet prefix */ +#define FS_BZ_RX_PREFIX_HASH_OFST 12 +#define FS_BZ_RX_PREFIX_SIZE 16 + #endif /* EFX_FARCH_REGS_H */ diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 21b1c2a..481e412 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -663,6 +663,9 @@ struct vfdi_status; * @rx_buffer_order: Order (log2) of number of pages for each RX buffer * @rx_buffer_truesize: Amortised allocation size of an RX buffer, * for use in sk_buff::truesize + * @rx_prefix_size: Size of RX prefix before packet data + * @rx_packet_hash_offset: Offset of RX flow hash from start of packet data + * (valid only if @rx_prefix_size != 0; always negative) * @rx_hash_key: Toeplitz hash key for RSS * @rx_indir_table: Indirection table for RSS * @rx_scatter: Scatter mode enabled for receives @@ -793,6 +796,8 @@ struct efx_nic { unsigned int rx_page_buf_step; unsigned int rx_bufs_per_page; unsigned int rx_pages_per_batch; + unsigned int rx_prefix_size; + int rx_packet_hash_offset; u8 rx_hash_key[40]; u32 rx_indir_table[128]; bool rx_scatter; @@ -1009,7 +1014,8 @@ struct efx_mtd_partition { * @evq_ptr_tbl_base: Event queue pointer table base address * @evq_rptr_tbl_base: Event queue read-pointer table base address * @max_dma_mask: Maximum possible DMA mask - * @rx_buffer_hash_size: Size of hash at start of RX packet + * @rx_prefix_size: Size of RX prefix before packet data + * @rx_hash_offset: Offset of RX flow hash within prefix * @rx_buffer_padding: Size of padding at end of RX packet * @can_rx_scatter: NIC is able to scatter packet to multiple buffers * @max_interrupt_mode: Highest capability interrupt mode supported @@ -1126,7 +1132,8 @@ struct efx_nic_type { unsigned int evq_ptr_tbl_base; unsigned int evq_rptr_tbl_base; u64 max_dma_mask; - unsigned int rx_buffer_hash_size; + unsigned int rx_prefix_size; + unsigned int rx_hash_offset; unsigned int rx_buffer_padding; bool can_rx_scatter; unsigned int max_interrupt_mode; diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 1299092..7646bb3 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -61,13 +61,12 @@ static inline u8 *efx_rx_buf_va(struct efx_rx_buffer *buf) return page_address(buf->page) + buf->page_offset; } -static inline u32 efx_rx_buf_hash(const u8 *eh) +static inline u32 efx_rx_buf_hash(struct efx_nic *efx, const u8 *eh) { - /* The ethernet header is always directly after any hash. */ -#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || NET_IP_ALIGN % 4 == 0 - return __le32_to_cpup((const __le32 *)(eh - 4)); +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) + return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_hash_offset)); #else - const u8 *data = eh - 4; + const u8 *data = eh + efx->rx_packet_hash_offset; return (u32)data[0] | (u32)data[1] << 8 | (u32)data[2] << 16 | @@ -439,7 +438,7 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, } if (efx->net_dev->features & NETIF_F_RXHASH) - skb->rxhash = efx_rx_buf_hash(eh); + skb->rxhash = efx_rx_buf_hash(efx, eh); skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE); @@ -568,8 +567,8 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, */ prefetch(efx_rx_buf_va(rx_buf)); - rx_buf->page_offset += efx->type->rx_buffer_hash_size; - rx_buf->len -= efx->type->rx_buffer_hash_size; + rx_buf->page_offset += efx->rx_prefix_size; + rx_buf->len -= efx->rx_prefix_size; if (n_frags > 1) { /* Release/sync DMA mapping for additional fragments. diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c index 3c0a544..89180d4 100644 --- a/drivers/net/ethernet/sfc/siena.c +++ b/drivers/net/ethernet/sfc/siena.c @@ -965,7 +965,8 @@ const struct efx_nic_type siena_a0_nic_type = { .evq_ptr_tbl_base = FR_BZ_EVQ_PTR_TBL, .evq_rptr_tbl_base = FR_BZ_EVQ_RPTR, .max_dma_mask = DMA_BIT_MASK(FSF_AZ_TX_KER_BUF_ADDR_WIDTH), - .rx_buffer_hash_size = 0x10, + .rx_prefix_size = FS_BZ_RX_PREFIX_SIZE, + .rx_hash_offset = FS_BZ_RX_PREFIX_HASH_OFST, .rx_buffer_padding = 0, .can_rx_scatter = true, .max_interrupt_mode = EFX_INT_MODE_MSIX,