342 lines
8.5 KiB
C
342 lines
8.5 KiB
C
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/* Broadcom NetXtreme-C/E network driver.
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*
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* Copyright (c) 2016-2017 Broadcom Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_vlan.h>
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#include <linux/bpf.h>
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#include <linux/bpf_trace.h>
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#include <linux/filter.h>
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#include <net/page_pool.h>
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#include "bnxt_hsi.h"
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#include "bnxt.h"
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#include "bnxt_xdp.h"
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struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
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struct bnxt_tx_ring_info *txr,
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dma_addr_t mapping, u32 len)
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{
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struct bnxt_sw_tx_bd *tx_buf;
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struct tx_bd *txbd;
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u32 flags;
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u16 prod;
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prod = txr->tx_prod;
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tx_buf = &txr->tx_buf_ring[prod];
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txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
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flags = (len << TX_BD_LEN_SHIFT) | (1 << TX_BD_FLAGS_BD_CNT_SHIFT) |
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TX_BD_FLAGS_PACKET_END | bnxt_lhint_arr[len >> 9];
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txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
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txbd->tx_bd_opaque = prod;
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txbd->tx_bd_haddr = cpu_to_le64(mapping);
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prod = NEXT_TX(prod);
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txr->tx_prod = prod;
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return tx_buf;
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}
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static void __bnxt_xmit_xdp(struct bnxt *bp, struct bnxt_tx_ring_info *txr,
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dma_addr_t mapping, u32 len, u16 rx_prod)
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{
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struct bnxt_sw_tx_bd *tx_buf;
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tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
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tx_buf->rx_prod = rx_prod;
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tx_buf->action = XDP_TX;
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}
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static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
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struct bnxt_tx_ring_info *txr,
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dma_addr_t mapping, u32 len,
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struct xdp_frame *xdpf)
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{
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struct bnxt_sw_tx_bd *tx_buf;
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tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
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tx_buf->action = XDP_REDIRECT;
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tx_buf->xdpf = xdpf;
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dma_unmap_addr_set(tx_buf, mapping, mapping);
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dma_unmap_len_set(tx_buf, len, 0);
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}
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void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
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{
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struct bnxt_tx_ring_info *txr = bnapi->tx_ring;
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struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
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bool rx_doorbell_needed = false;
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struct bnxt_sw_tx_bd *tx_buf;
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u16 tx_cons = txr->tx_cons;
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u16 last_tx_cons = tx_cons;
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int i;
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for (i = 0; i < nr_pkts; i++) {
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tx_buf = &txr->tx_buf_ring[tx_cons];
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if (tx_buf->action == XDP_REDIRECT) {
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struct pci_dev *pdev = bp->pdev;
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dma_unmap_single(&pdev->dev,
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dma_unmap_addr(tx_buf, mapping),
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dma_unmap_len(tx_buf, len),
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PCI_DMA_TODEVICE);
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xdp_return_frame(tx_buf->xdpf);
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tx_buf->action = 0;
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tx_buf->xdpf = NULL;
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} else if (tx_buf->action == XDP_TX) {
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rx_doorbell_needed = true;
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last_tx_cons = tx_cons;
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}
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tx_cons = NEXT_TX(tx_cons);
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}
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txr->tx_cons = tx_cons;
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if (rx_doorbell_needed) {
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tx_buf = &txr->tx_buf_ring[last_tx_cons];
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bnxt_db_write(bp, &rxr->rx_db, tx_buf->rx_prod);
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}
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}
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/* returns the following:
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* true - packet consumed by XDP and new buffer is allocated.
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* false - packet should be passed to the stack.
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*/
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bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
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struct page *page, u8 **data_ptr, unsigned int *len, u8 *event)
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{
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struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
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struct bnxt_tx_ring_info *txr;
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struct bnxt_sw_rx_bd *rx_buf;
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struct pci_dev *pdev;
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struct xdp_buff xdp;
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dma_addr_t mapping;
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void *orig_data;
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u32 tx_avail;
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u32 offset;
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u32 act;
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if (!xdp_prog)
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return false;
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pdev = bp->pdev;
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rx_buf = &rxr->rx_buf_ring[cons];
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offset = bp->rx_offset;
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mapping = rx_buf->mapping - bp->rx_dma_offset;
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dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
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txr = rxr->bnapi->tx_ring;
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xdp.data_hard_start = *data_ptr - offset;
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xdp.data = *data_ptr;
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xdp_set_data_meta_invalid(&xdp);
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xdp.data_end = *data_ptr + *len;
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xdp.rxq = &rxr->xdp_rxq;
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orig_data = xdp.data;
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rcu_read_lock();
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act = bpf_prog_run_xdp(xdp_prog, &xdp);
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rcu_read_unlock();
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tx_avail = bnxt_tx_avail(bp, txr);
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/* If the tx ring is not full, we must not update the rx producer yet
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* because we may still be transmitting on some BDs.
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*/
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if (tx_avail != bp->tx_ring_size)
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*event &= ~BNXT_RX_EVENT;
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*len = xdp.data_end - xdp.data;
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if (orig_data != xdp.data) {
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offset = xdp.data - xdp.data_hard_start;
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*data_ptr = xdp.data_hard_start + offset;
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}
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switch (act) {
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case XDP_PASS:
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return false;
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case XDP_TX:
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if (tx_avail < 1) {
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trace_xdp_exception(bp->dev, xdp_prog, act);
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bnxt_reuse_rx_data(rxr, cons, page);
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return true;
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}
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*event = BNXT_TX_EVENT;
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dma_sync_single_for_device(&pdev->dev, mapping + offset, *len,
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bp->rx_dir);
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__bnxt_xmit_xdp(bp, txr, mapping + offset, *len,
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NEXT_RX(rxr->rx_prod));
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bnxt_reuse_rx_data(rxr, cons, page);
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return true;
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case XDP_REDIRECT:
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/* if we are calling this here then we know that the
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* redirect is coming from a frame received by the
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* bnxt_en driver.
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*/
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dma_unmap_page_attrs(&pdev->dev, mapping,
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PAGE_SIZE, bp->rx_dir,
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DMA_ATTR_WEAK_ORDERING);
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/* if we are unable to allocate a new buffer, abort and reuse */
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if (bnxt_alloc_rx_data(bp, rxr, rxr->rx_prod, GFP_ATOMIC)) {
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trace_xdp_exception(bp->dev, xdp_prog, act);
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bnxt_reuse_rx_data(rxr, cons, page);
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return true;
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}
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if (xdp_do_redirect(bp->dev, &xdp, xdp_prog)) {
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trace_xdp_exception(bp->dev, xdp_prog, act);
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page_pool_recycle_direct(rxr->page_pool, page);
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return true;
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}
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*event |= BNXT_REDIRECT_EVENT;
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break;
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default:
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bpf_warn_invalid_xdp_action(act);
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/* Fall thru */
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case XDP_ABORTED:
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trace_xdp_exception(bp->dev, xdp_prog, act);
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/* Fall thru */
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case XDP_DROP:
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bnxt_reuse_rx_data(rxr, cons, page);
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break;
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}
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return true;
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}
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int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
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struct xdp_frame **frames, u32 flags)
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{
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struct bnxt *bp = netdev_priv(dev);
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struct bpf_prog *xdp_prog = READ_ONCE(bp->xdp_prog);
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struct pci_dev *pdev = bp->pdev;
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struct bnxt_tx_ring_info *txr;
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dma_addr_t mapping;
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int drops = 0;
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int ring;
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int i;
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if (!test_bit(BNXT_STATE_OPEN, &bp->state) ||
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!bp->tx_nr_rings_xdp ||
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!xdp_prog)
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return -EINVAL;
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ring = smp_processor_id() % bp->tx_nr_rings_xdp;
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txr = &bp->tx_ring[ring];
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for (i = 0; i < num_frames; i++) {
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struct xdp_frame *xdp = frames[i];
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if (!txr || !bnxt_tx_avail(bp, txr) ||
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!(bp->bnapi[ring]->flags & BNXT_NAPI_FLAG_XDP)) {
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xdp_return_frame_rx_napi(xdp);
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drops++;
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continue;
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}
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mapping = dma_map_single(&pdev->dev, xdp->data, xdp->len,
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DMA_TO_DEVICE);
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if (dma_mapping_error(&pdev->dev, mapping)) {
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xdp_return_frame_rx_napi(xdp);
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drops++;
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continue;
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}
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__bnxt_xmit_xdp_redirect(bp, txr, mapping, xdp->len, xdp);
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}
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if (flags & XDP_XMIT_FLUSH) {
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/* Sync BD data before updating doorbell */
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wmb();
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bnxt_db_write(bp, &txr->tx_db, txr->tx_prod);
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}
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return num_frames - drops;
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}
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/* Under rtnl_lock */
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static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
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{
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struct net_device *dev = bp->dev;
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int tx_xdp = 0, rc, tc;
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struct bpf_prog *old;
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if (prog && bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
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netdev_warn(dev, "MTU %d larger than largest XDP supported MTU %d.\n",
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bp->dev->mtu, BNXT_MAX_PAGE_MODE_MTU);
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return -EOPNOTSUPP;
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}
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if (!(bp->flags & BNXT_FLAG_SHARED_RINGS)) {
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netdev_warn(dev, "ethtool rx/tx channels must be combined to support XDP.\n");
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return -EOPNOTSUPP;
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}
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if (prog)
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tx_xdp = bp->rx_nr_rings;
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tc = netdev_get_num_tc(dev);
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if (!tc)
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tc = 1;
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rc = bnxt_check_rings(bp, bp->tx_nr_rings_per_tc, bp->rx_nr_rings,
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true, tc, tx_xdp);
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if (rc) {
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netdev_warn(dev, "Unable to reserve enough TX rings to support XDP.\n");
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return rc;
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}
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if (netif_running(dev))
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bnxt_close_nic(bp, true, false);
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old = xchg(&bp->xdp_prog, prog);
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if (old)
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bpf_prog_put(old);
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if (prog) {
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bnxt_set_rx_skb_mode(bp, true);
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} else {
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int rx, tx;
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bnxt_set_rx_skb_mode(bp, false);
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bnxt_get_max_rings(bp, &rx, &tx, true);
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if (rx > 1) {
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bp->flags &= ~BNXT_FLAG_NO_AGG_RINGS;
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bp->dev->hw_features |= NETIF_F_LRO;
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}
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}
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bp->tx_nr_rings_xdp = tx_xdp;
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bp->tx_nr_rings = bp->tx_nr_rings_per_tc * tc + tx_xdp;
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bp->cp_nr_rings = max_t(int, bp->tx_nr_rings, bp->rx_nr_rings);
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bnxt_set_tpa_flags(bp);
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bnxt_set_ring_params(bp);
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if (netif_running(dev))
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return bnxt_open_nic(bp, true, false);
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return 0;
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}
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int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp)
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{
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struct bnxt *bp = netdev_priv(dev);
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int rc;
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switch (xdp->command) {
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case XDP_SETUP_PROG:
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rc = bnxt_xdp_set(bp, xdp->prog);
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break;
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case XDP_QUERY_PROG:
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xdp->prog_id = bp->xdp_prog ? bp->xdp_prog->aux->id : 0;
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rc = 0;
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break;
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default:
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rc = -EINVAL;
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break;
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}
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return rc;
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}
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