1 /* Broadcom NetXtreme-C/E network driver.
3 * Copyright (c) 2016-2017 Broadcom Limited
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation.
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/pci.h>
12 #include <linux/netdevice.h>
13 #include <linux/etherdevice.h>
14 #include <linux/if_vlan.h>
15 #include <linux/bpf.h>
16 #include <linux/bpf_trace.h>
17 #include <linux/filter.h>
22 void bnxt_xmit_xdp(struct bnxt *bp, struct bnxt_tx_ring_info *txr,
23 dma_addr_t mapping, u32 len, u16 rx_prod)
25 struct bnxt_sw_tx_bd *tx_buf;
31 tx_buf = &txr->tx_buf_ring[prod];
32 tx_buf->rx_prod = rx_prod;
34 txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
35 flags = (len << TX_BD_LEN_SHIFT) | (1 << TX_BD_FLAGS_BD_CNT_SHIFT) |
36 TX_BD_FLAGS_PACKET_END | bnxt_lhint_arr[len >> 9];
37 txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
38 txbd->tx_bd_opaque = prod;
39 txbd->tx_bd_haddr = cpu_to_le64(mapping);
45 void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
47 struct bnxt_tx_ring_info *txr = bnapi->tx_ring;
48 struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
49 struct bnxt_sw_tx_bd *tx_buf;
50 u16 tx_cons = txr->tx_cons;
51 u16 last_tx_cons = tx_cons;
55 for (i = 0; i < nr_pkts; i++) {
56 last_tx_cons = tx_cons;
57 tx_cons = NEXT_TX(tx_cons);
59 txr->tx_cons = tx_cons;
60 if (bnxt_tx_avail(bp, txr) == bp->tx_ring_size) {
61 rx_prod = rxr->rx_prod;
63 tx_buf = &txr->tx_buf_ring[last_tx_cons];
64 rx_prod = tx_buf->rx_prod;
66 bnxt_db_write(bp, rxr->rx_doorbell, DB_KEY_RX | rx_prod);
69 /* returns the following:
70 * true - packet consumed by XDP and new buffer is allocated.
71 * false - packet should be passed to the stack.
73 bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
74 struct page *page, u8 **data_ptr, unsigned int *len, u8 *event)
76 struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
77 struct bnxt_tx_ring_info *txr;
78 struct bnxt_sw_rx_bd *rx_buf;
91 txr = rxr->bnapi->tx_ring;
92 rx_buf = &rxr->rx_buf_ring[cons];
93 offset = bp->rx_offset;
95 xdp.data_hard_start = *data_ptr - offset;
97 xdp.data_end = *data_ptr + *len;
99 mapping = rx_buf->mapping - bp->rx_dma_offset;
101 dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
104 act = bpf_prog_run_xdp(xdp_prog, &xdp);
107 tx_avail = bnxt_tx_avail(bp, txr);
108 /* If the tx ring is not full, we must not update the rx producer yet
109 * because we may still be transmitting on some BDs.
111 if (tx_avail != bp->tx_ring_size)
112 *event &= ~BNXT_RX_EVENT;
114 if (orig_data != xdp.data) {
115 offset = xdp.data - xdp.data_hard_start;
116 *data_ptr = xdp.data_hard_start + offset;
117 *len = xdp.data_end - xdp.data;
125 trace_xdp_exception(bp->dev, xdp_prog, act);
126 bnxt_reuse_rx_data(rxr, cons, page);
130 *event = BNXT_TX_EVENT;
131 dma_sync_single_for_device(&pdev->dev, mapping + offset, *len,
133 bnxt_xmit_xdp(bp, txr, mapping + offset, *len,
134 NEXT_RX(rxr->rx_prod));
135 bnxt_reuse_rx_data(rxr, cons, page);
138 bpf_warn_invalid_xdp_action(act);
141 trace_xdp_exception(bp->dev, xdp_prog, act);
144 bnxt_reuse_rx_data(rxr, cons, page);
150 /* Under rtnl_lock */
151 static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
153 struct net_device *dev = bp->dev;
154 int tx_xdp = 0, rc, tc;
155 struct bpf_prog *old;
157 if (prog && bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
158 netdev_warn(dev, "MTU %d larger than largest XDP supported MTU %d.\n",
159 bp->dev->mtu, BNXT_MAX_PAGE_MODE_MTU);
162 if (!(bp->flags & BNXT_FLAG_SHARED_RINGS)) {
163 netdev_warn(dev, "ethtool rx/tx channels must be combined to support XDP.\n");
167 tx_xdp = bp->rx_nr_rings;
169 tc = netdev_get_num_tc(dev);
172 rc = bnxt_reserve_rings(bp, bp->tx_nr_rings_per_tc, bp->rx_nr_rings,
175 netdev_warn(dev, "Unable to reserve enough TX rings to support XDP.\n");
178 if (netif_running(dev))
179 bnxt_close_nic(bp, true, false);
181 old = xchg(&bp->xdp_prog, prog);
186 bnxt_set_rx_skb_mode(bp, true);
190 bnxt_set_rx_skb_mode(bp, false);
191 bnxt_get_max_rings(bp, &rx, &tx, true);
193 bp->flags &= ~BNXT_FLAG_NO_AGG_RINGS;
194 bp->dev->hw_features |= NETIF_F_LRO;
197 bp->tx_nr_rings_xdp = tx_xdp;
198 bp->tx_nr_rings = bp->tx_nr_rings_per_tc * tc + tx_xdp;
199 bp->cp_nr_rings = max_t(int, bp->tx_nr_rings, bp->rx_nr_rings);
200 bp->num_stat_ctxs = bp->cp_nr_rings;
201 bnxt_set_tpa_flags(bp);
202 bnxt_set_ring_params(bp);
204 if (netif_running(dev))
205 return bnxt_open_nic(bp, true, false);
210 int bnxt_xdp(struct net_device *dev, struct netdev_xdp *xdp)
212 struct bnxt *bp = netdev_priv(dev);
215 switch (xdp->command) {
217 rc = bnxt_xdp_set(bp, xdp->prog);
220 xdp->prog_attached = !!bp->xdp_prog;