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>
18 #include <net/page_pool.h>
23 DEFINE_STATIC_KEY_FALSE(bnxt_xdp_locking_key);
25 struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
26 struct bnxt_tx_ring_info *txr,
27 dma_addr_t mapping, u32 len)
29 struct bnxt_sw_tx_bd *tx_buf;
35 tx_buf = &txr->tx_buf_ring[prod];
37 txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
38 flags = (len << TX_BD_LEN_SHIFT) | (1 << TX_BD_FLAGS_BD_CNT_SHIFT) |
39 TX_BD_FLAGS_PACKET_END | bnxt_lhint_arr[len >> 9];
40 txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
41 txbd->tx_bd_opaque = prod;
42 txbd->tx_bd_haddr = cpu_to_le64(mapping);
49 static void __bnxt_xmit_xdp(struct bnxt *bp, struct bnxt_tx_ring_info *txr,
50 dma_addr_t mapping, u32 len, u16 rx_prod)
52 struct bnxt_sw_tx_bd *tx_buf;
54 tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
55 tx_buf->rx_prod = rx_prod;
56 tx_buf->action = XDP_TX;
59 static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
60 struct bnxt_tx_ring_info *txr,
61 dma_addr_t mapping, u32 len,
62 struct xdp_frame *xdpf)
64 struct bnxt_sw_tx_bd *tx_buf;
66 tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
67 tx_buf->action = XDP_REDIRECT;
69 dma_unmap_addr_set(tx_buf, mapping, mapping);
70 dma_unmap_len_set(tx_buf, len, 0);
73 void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
75 struct bnxt_tx_ring_info *txr = bnapi->tx_ring;
76 struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
77 bool rx_doorbell_needed = false;
78 struct bnxt_sw_tx_bd *tx_buf;
79 u16 tx_cons = txr->tx_cons;
80 u16 last_tx_cons = tx_cons;
83 for (i = 0; i < nr_pkts; i++) {
84 tx_buf = &txr->tx_buf_ring[tx_cons];
86 if (tx_buf->action == XDP_REDIRECT) {
87 struct pci_dev *pdev = bp->pdev;
89 dma_unmap_single(&pdev->dev,
90 dma_unmap_addr(tx_buf, mapping),
91 dma_unmap_len(tx_buf, len),
93 xdp_return_frame(tx_buf->xdpf);
96 } else if (tx_buf->action == XDP_TX) {
97 rx_doorbell_needed = true;
98 last_tx_cons = tx_cons;
100 tx_cons = NEXT_TX(tx_cons);
102 txr->tx_cons = tx_cons;
103 if (rx_doorbell_needed) {
104 tx_buf = &txr->tx_buf_ring[last_tx_cons];
105 bnxt_db_write(bp, &rxr->rx_db, tx_buf->rx_prod);
109 /* returns the following:
110 * true - packet consumed by XDP and new buffer is allocated.
111 * false - packet should be passed to the stack.
113 bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
114 struct page *page, u8 **data_ptr, unsigned int *len, u8 *event)
116 struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
117 struct bnxt_tx_ring_info *txr;
118 struct bnxt_sw_rx_bd *rx_buf;
119 struct pci_dev *pdev;
131 rx_buf = &rxr->rx_buf_ring[cons];
132 offset = bp->rx_offset;
134 mapping = rx_buf->mapping - bp->rx_dma_offset;
135 dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
137 txr = rxr->bnapi->tx_ring;
138 /* BNXT_RX_PAGE_MODE(bp) when XDP enabled */
139 xdp_init_buff(&xdp, PAGE_SIZE, &rxr->xdp_rxq);
140 xdp_prepare_buff(&xdp, *data_ptr - offset, offset, *len, false);
141 orig_data = xdp.data;
143 act = bpf_prog_run_xdp(xdp_prog, &xdp);
145 tx_avail = bnxt_tx_avail(bp, txr);
146 /* If the tx ring is not full, we must not update the rx producer yet
147 * because we may still be transmitting on some BDs.
149 if (tx_avail != bp->tx_ring_size)
150 *event &= ~BNXT_RX_EVENT;
152 *len = xdp.data_end - xdp.data;
153 if (orig_data != xdp.data) {
154 offset = xdp.data - xdp.data_hard_start;
155 *data_ptr = xdp.data_hard_start + offset;
163 trace_xdp_exception(bp->dev, xdp_prog, act);
164 bnxt_reuse_rx_data(rxr, cons, page);
168 *event = BNXT_TX_EVENT;
169 dma_sync_single_for_device(&pdev->dev, mapping + offset, *len,
171 __bnxt_xmit_xdp(bp, txr, mapping + offset, *len,
172 NEXT_RX(rxr->rx_prod));
173 bnxt_reuse_rx_data(rxr, cons, page);
176 /* if we are calling this here then we know that the
177 * redirect is coming from a frame received by the
180 dma_unmap_page_attrs(&pdev->dev, mapping,
181 PAGE_SIZE, bp->rx_dir,
182 DMA_ATTR_WEAK_ORDERING);
184 /* if we are unable to allocate a new buffer, abort and reuse */
185 if (bnxt_alloc_rx_data(bp, rxr, rxr->rx_prod, GFP_ATOMIC)) {
186 trace_xdp_exception(bp->dev, xdp_prog, act);
187 bnxt_reuse_rx_data(rxr, cons, page);
191 if (xdp_do_redirect(bp->dev, &xdp, xdp_prog)) {
192 trace_xdp_exception(bp->dev, xdp_prog, act);
193 page_pool_recycle_direct(rxr->page_pool, page);
197 *event |= BNXT_REDIRECT_EVENT;
200 bpf_warn_invalid_xdp_action(bp->dev, xdp_prog, act);
203 trace_xdp_exception(bp->dev, xdp_prog, act);
206 bnxt_reuse_rx_data(rxr, cons, page);
212 int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
213 struct xdp_frame **frames, u32 flags)
215 struct bnxt *bp = netdev_priv(dev);
216 struct bpf_prog *xdp_prog = READ_ONCE(bp->xdp_prog);
217 struct pci_dev *pdev = bp->pdev;
218 struct bnxt_tx_ring_info *txr;
224 if (!test_bit(BNXT_STATE_OPEN, &bp->state) ||
225 !bp->tx_nr_rings_xdp ||
229 ring = smp_processor_id() % bp->tx_nr_rings_xdp;
230 txr = &bp->tx_ring[ring];
232 if (READ_ONCE(txr->dev_state) == BNXT_DEV_STATE_CLOSING)
235 if (static_branch_unlikely(&bnxt_xdp_locking_key))
236 spin_lock(&txr->xdp_tx_lock);
238 for (i = 0; i < num_frames; i++) {
239 struct xdp_frame *xdp = frames[i];
241 if (!bnxt_tx_avail(bp, txr))
244 mapping = dma_map_single(&pdev->dev, xdp->data, xdp->len,
247 if (dma_mapping_error(&pdev->dev, mapping))
250 __bnxt_xmit_xdp_redirect(bp, txr, mapping, xdp->len, xdp);
254 if (flags & XDP_XMIT_FLUSH) {
255 /* Sync BD data before updating doorbell */
257 bnxt_db_write(bp, &txr->tx_db, txr->tx_prod);
260 if (static_branch_unlikely(&bnxt_xdp_locking_key))
261 spin_unlock(&txr->xdp_tx_lock);
266 /* Under rtnl_lock */
267 static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
269 struct net_device *dev = bp->dev;
270 int tx_xdp = 0, rc, tc;
271 struct bpf_prog *old;
273 if (prog && bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
274 netdev_warn(dev, "MTU %d larger than largest XDP supported MTU %d.\n",
275 bp->dev->mtu, BNXT_MAX_PAGE_MODE_MTU);
278 if (!(bp->flags & BNXT_FLAG_SHARED_RINGS)) {
279 netdev_warn(dev, "ethtool rx/tx channels must be combined to support XDP.\n");
283 tx_xdp = bp->rx_nr_rings;
285 tc = netdev_get_num_tc(dev);
288 rc = bnxt_check_rings(bp, bp->tx_nr_rings_per_tc, bp->rx_nr_rings,
291 netdev_warn(dev, "Unable to reserve enough TX rings to support XDP.\n");
294 if (netif_running(dev))
295 bnxt_close_nic(bp, true, false);
297 old = xchg(&bp->xdp_prog, prog);
302 bnxt_set_rx_skb_mode(bp, true);
306 bnxt_set_rx_skb_mode(bp, false);
307 bnxt_get_max_rings(bp, &rx, &tx, true);
309 bp->flags &= ~BNXT_FLAG_NO_AGG_RINGS;
310 bp->dev->hw_features |= NETIF_F_LRO;
313 bp->tx_nr_rings_xdp = tx_xdp;
314 bp->tx_nr_rings = bp->tx_nr_rings_per_tc * tc + tx_xdp;
315 bp->cp_nr_rings = max_t(int, bp->tx_nr_rings, bp->rx_nr_rings);
316 bnxt_set_tpa_flags(bp);
317 bnxt_set_ring_params(bp);
319 if (netif_running(dev))
320 return bnxt_open_nic(bp, true, false);
325 int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp)
327 struct bnxt *bp = netdev_priv(dev);
330 switch (xdp->command) {
332 rc = bnxt_xdp_set(bp, xdp->prog);