487 lines
12 KiB
C
487 lines
12 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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DEFINE_STATIC_KEY_FALSE(bnxt_xdp_locking_key);
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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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struct xdp_buff *xdp)
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{
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struct skb_shared_info *sinfo;
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struct bnxt_sw_tx_bd *tx_buf;
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struct tx_bd *txbd;
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int num_frags = 0;
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u32 flags;
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u16 prod;
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int i;
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if (xdp && xdp_buff_has_frags(xdp)) {
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sinfo = xdp_get_shared_info_from_buff(xdp);
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num_frags = sinfo->nr_frags;
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}
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/* fill up the first buffer */
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prod = txr->tx_prod;
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tx_buf = &txr->tx_buf_ring[prod];
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tx_buf->nr_frags = num_frags;
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if (xdp)
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tx_buf->page = virt_to_head_page(xdp->data);
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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) |
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((num_frags + 1) << TX_BD_FLAGS_BD_CNT_SHIFT) |
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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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/* now let us fill up the frags into the next buffers */
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for (i = 0; i < num_frags ; i++) {
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skb_frag_t *frag = &sinfo->frags[i];
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struct bnxt_sw_tx_bd *frag_tx_buf;
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struct pci_dev *pdev = bp->pdev;
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dma_addr_t frag_mapping;
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int frag_len;
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prod = NEXT_TX(prod);
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txr->tx_prod = prod;
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/* first fill up the first buffer */
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frag_tx_buf = &txr->tx_buf_ring[prod];
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frag_tx_buf->page = skb_frag_page(frag);
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txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
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frag_len = skb_frag_size(frag);
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frag_mapping = skb_frag_dma_map(&pdev->dev, frag, 0,
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frag_len, DMA_TO_DEVICE);
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if (unlikely(dma_mapping_error(&pdev->dev, frag_mapping)))
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return NULL;
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dma_unmap_addr_set(frag_tx_buf, mapping, frag_mapping);
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flags = frag_len << TX_BD_LEN_SHIFT;
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txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
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txbd->tx_bd_haddr = cpu_to_le64(frag_mapping);
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len = frag_len;
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}
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flags &= ~TX_BD_LEN;
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txbd->tx_bd_len_flags_type = cpu_to_le32(((len) << TX_BD_LEN_SHIFT) | flags |
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TX_BD_FLAGS_PACKET_END);
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/* Sync TX BD */
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wmb();
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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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struct xdp_buff *xdp)
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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, xdp);
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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, NULL);
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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, j, frags;
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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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DMA_TO_DEVICE);
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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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frags = tx_buf->nr_frags;
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for (j = 0; j < frags; j++) {
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tx_cons = NEXT_TX(tx_cons);
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tx_buf = &txr->tx_buf_ring[tx_cons];
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page_pool_recycle_direct(rxr->page_pool, tx_buf->page);
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}
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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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bool bnxt_xdp_attached(struct bnxt *bp, struct bnxt_rx_ring_info *rxr)
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{
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struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
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return !!xdp_prog;
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}
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void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
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u16 cons, u8 *data_ptr, unsigned int len,
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struct xdp_buff *xdp)
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{
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struct bnxt_sw_rx_bd *rx_buf;
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u32 buflen = PAGE_SIZE;
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struct pci_dev *pdev;
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dma_addr_t mapping;
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u32 offset;
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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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xdp_init_buff(xdp, buflen, &rxr->xdp_rxq);
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xdp_prepare_buff(xdp, data_ptr - offset, offset, len, false);
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}
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void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr,
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struct xdp_buff *xdp)
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{
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struct skb_shared_info *shinfo;
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int i;
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if (!xdp || !xdp_buff_has_frags(xdp))
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return;
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shinfo = xdp_get_shared_info_from_buff(xdp);
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for (i = 0; i < shinfo->nr_frags; i++) {
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struct page *page = skb_frag_page(&shinfo->frags[i]);
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page_pool_recycle_direct(rxr->page_pool, page);
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}
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shinfo->nr_frags = 0;
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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 xdp_buff xdp, struct page *page, u8 **data_ptr,
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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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dma_addr_t mapping;
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u32 tx_needed = 1;
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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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offset = bp->rx_offset;
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txr = rxr->bnapi->tx_ring;
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/* BNXT_RX_PAGE_MODE(bp) when XDP enabled */
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orig_data = xdp.data;
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act = bpf_prog_run_xdp(xdp_prog, &xdp);
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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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rx_buf = &rxr->rx_buf_ring[cons];
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mapping = rx_buf->mapping - bp->rx_dma_offset;
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*event = 0;
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if (unlikely(xdp_buff_has_frags(&xdp))) {
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struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(&xdp);
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tx_needed += sinfo->nr_frags;
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*event = BNXT_AGG_EVENT;
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}
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if (tx_avail < tx_needed) {
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trace_xdp_exception(bp->dev, xdp_prog, act);
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bnxt_xdp_buff_frags_free(rxr, &xdp);
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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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dma_sync_single_for_device(&pdev->dev, mapping + offset, *len,
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bp->rx_dir);
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*event |= BNXT_TX_EVENT;
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__bnxt_xmit_xdp(bp, txr, mapping + offset, *len,
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NEXT_RX(rxr->rx_prod), &xdp);
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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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rx_buf = &rxr->rx_buf_ring[cons];
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mapping = rx_buf->mapping - bp->rx_dma_offset;
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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_xdp_buff_frags_free(rxr, &xdp);
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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(bp->dev, xdp_prog, act);
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fallthrough;
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case XDP_ABORTED:
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trace_xdp_exception(bp->dev, xdp_prog, act);
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fallthrough;
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case XDP_DROP:
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bnxt_xdp_buff_frags_free(rxr, &xdp);
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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 nxmit = 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 ||
|
||
|
|
!xdp_prog)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
ring = smp_processor_id() % bp->tx_nr_rings_xdp;
|
||
|
|
txr = &bp->tx_ring[ring];
|
||
|
|
|
||
|
|
if (READ_ONCE(txr->dev_state) == BNXT_DEV_STATE_CLOSING)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (static_branch_unlikely(&bnxt_xdp_locking_key))
|
||
|
|
spin_lock(&txr->xdp_tx_lock);
|
||
|
|
|
||
|
|
for (i = 0; i < num_frames; i++) {
|
||
|
|
struct xdp_frame *xdp = frames[i];
|
||
|
|
|
||
|
|
if (!bnxt_tx_avail(bp, txr))
|
||
|
|
break;
|
||
|
|
|
||
|
|
mapping = dma_map_single(&pdev->dev, xdp->data, xdp->len,
|
||
|
|
DMA_TO_DEVICE);
|
||
|
|
|
||
|
|
if (dma_mapping_error(&pdev->dev, mapping))
|
||
|
|
break;
|
||
|
|
|
||
|
|
__bnxt_xmit_xdp_redirect(bp, txr, mapping, xdp->len, xdp);
|
||
|
|
nxmit++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (flags & XDP_XMIT_FLUSH) {
|
||
|
|
/* Sync BD data before updating doorbell */
|
||
|
|
wmb();
|
||
|
|
bnxt_db_write(bp, &txr->tx_db, txr->tx_prod);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (static_branch_unlikely(&bnxt_xdp_locking_key))
|
||
|
|
spin_unlock(&txr->xdp_tx_lock);
|
||
|
|
|
||
|
|
return nxmit;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Under rtnl_lock */
|
||
|
|
static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
|
||
|
|
{
|
||
|
|
struct net_device *dev = bp->dev;
|
||
|
|
int tx_xdp = 0, rc, tc;
|
||
|
|
struct bpf_prog *old;
|
||
|
|
|
||
|
|
if (prog && !prog->aux->xdp_has_frags &&
|
||
|
|
bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
|
||
|
|
netdev_warn(dev, "MTU %d larger than %d without XDP frag support.\n",
|
||
|
|
bp->dev->mtu, BNXT_MAX_PAGE_MODE_MTU);
|
||
|
|
return -EOPNOTSUPP;
|
||
|
|
}
|
||
|
|
if (!(bp->flags & BNXT_FLAG_SHARED_RINGS)) {
|
||
|
|
netdev_warn(dev, "ethtool rx/tx channels must be combined to support XDP.\n");
|
||
|
|
return -EOPNOTSUPP;
|
||
|
|
}
|
||
|
|
if (prog)
|
||
|
|
tx_xdp = bp->rx_nr_rings;
|
||
|
|
|
||
|
|
tc = netdev_get_num_tc(dev);
|
||
|
|
if (!tc)
|
||
|
|
tc = 1;
|
||
|
|
rc = bnxt_check_rings(bp, bp->tx_nr_rings_per_tc, bp->rx_nr_rings,
|
||
|
|
true, tc, tx_xdp);
|
||
|
|
if (rc) {
|
||
|
|
netdev_warn(dev, "Unable to reserve enough TX rings to support XDP.\n");
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
if (netif_running(dev))
|
||
|
|
bnxt_close_nic(bp, true, false);
|
||
|
|
|
||
|
|
old = xchg(&bp->xdp_prog, prog);
|
||
|
|
if (old)
|
||
|
|
bpf_prog_put(old);
|
||
|
|
|
||
|
|
if (prog) {
|
||
|
|
bnxt_set_rx_skb_mode(bp, true);
|
||
|
|
xdp_features_set_redirect_target(dev, true);
|
||
|
|
} else {
|
||
|
|
int rx, tx;
|
||
|
|
|
||
|
|
xdp_features_clear_redirect_target(dev);
|
||
|
|
bnxt_set_rx_skb_mode(bp, false);
|
||
|
|
bnxt_get_max_rings(bp, &rx, &tx, true);
|
||
|
|
if (rx > 1) {
|
||
|
|
bp->flags &= ~BNXT_FLAG_NO_AGG_RINGS;
|
||
|
|
bp->dev->hw_features |= NETIF_F_LRO;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
bp->tx_nr_rings_xdp = tx_xdp;
|
||
|
|
bp->tx_nr_rings = bp->tx_nr_rings_per_tc * tc + tx_xdp;
|
||
|
|
bp->cp_nr_rings = max_t(int, bp->tx_nr_rings, bp->rx_nr_rings);
|
||
|
|
bnxt_set_tpa_flags(bp);
|
||
|
|
bnxt_set_ring_params(bp);
|
||
|
|
|
||
|
|
if (netif_running(dev))
|
||
|
|
return bnxt_open_nic(bp, true, false);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp)
|
||
|
|
{
|
||
|
|
struct bnxt *bp = netdev_priv(dev);
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
switch (xdp->command) {
|
||
|
|
case XDP_SETUP_PROG:
|
||
|
|
rc = bnxt_xdp_set(bp, xdp->prog);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
rc = -EINVAL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct sk_buff *
|
||
|
|
bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, u8 num_frags,
|
||
|
|
struct page_pool *pool, struct xdp_buff *xdp,
|
||
|
|
struct rx_cmp_ext *rxcmp1)
|
||
|
|
{
|
||
|
|
struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
|
||
|
|
|
||
|
|
if (!skb)
|
||
|
|
return NULL;
|
||
|
|
skb_checksum_none_assert(skb);
|
||
|
|
if (RX_CMP_L4_CS_OK(rxcmp1)) {
|
||
|
|
if (bp->dev->features & NETIF_F_RXCSUM) {
|
||
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
||
|
|
skb->csum_level = RX_CMP_ENCAP(rxcmp1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
xdp_update_skb_shared_info(skb, num_frags,
|
||
|
|
sinfo->xdp_frags_size,
|
||
|
|
PAGE_SIZE * sinfo->nr_frags,
|
||
|
|
xdp_buff_is_frag_pfmemalloc(xdp));
|
||
|
|
return skb;
|
||
|
|
}
|