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nfp: add XDP support in the driver

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Add XDP support.  Separate stack's and XDP's TX rings logically.
Add functions for handling XDP_TX and cleanup of XDP's TX rings.
For XDP allocate all RX buffers as separate pages and map them
with DMA_BIDIRECTIONAL.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2016-11-03 17:12:07 +00:00 committed by David S. Miller
parent 68f929ff26
commit ecd63a0217
4 changed files with 449 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/net/ethernet/netronome/nfp/nfp_net.h
View File

@ -171,7 +171,10 @@ struct nfp_net_tx_desc {
* on the head's buffer). Equal to skb->len for non-TSO packets.
*/
struct nfp_net_tx_buf {
struct sk_buff *skb;
union {
struct sk_buff *skb;
void *frag;
};
dma_addr_t dma_addr;
short int fidx;
u16 pkt_cnt;
@ -341,6 +344,7 @@ struct nfp_net_rx_ring {
* @napi: NAPI structure for this ring vec
* @tx_ring: Pointer to TX ring
* @rx_ring: Pointer to RX ring
* @xdp_ring: Pointer to an extra TX ring for XDP
* @irq_idx: Index into MSI-X table
* @rx_sync: Seqlock for atomic updates of RX stats
* @rx_pkts: Number of received packets
@ -384,6 +388,8 @@ struct nfp_net_r_vector {
u64 hw_csum_rx_inner_ok;
u64 hw_csum_rx_error;
struct nfp_net_tx_ring *xdp_ring;
struct u64_stats_sync tx_sync;
u64 tx_pkts;
u64 tx_bytes;
@ -432,6 +438,7 @@ struct nfp_stat_pair {
* @ctrl: Local copy of the control register/word.
* @fl_bufsz: Currently configured size of the freelist buffers
* @rx_offset: Offset in the RX buffers where packet data starts
* @xdp_prog: Installed XDP program
* @cpp: Pointer to the CPP handle
* @nfp_dev_cpp: Pointer to the NFP Device handle
* @ctrl_area: Pointer to the CPP area for the control BAR
@ -451,6 +458,7 @@ struct nfp_stat_pair {
* @max_tx_rings: Maximum number of TX rings supported by the Firmware
* @max_rx_rings: Maximum number of RX rings supported by the Firmware
* @num_tx_rings: Currently configured number of TX rings
* @num_stack_tx_rings: Number of TX rings used by the stack (not XDP)
* @num_rx_rings: Currently configured number of RX rings
* @txd_cnt: Size of the TX ring in number of descriptors
* @rxd_cnt: Size of the RX ring in number of descriptors
@ -500,6 +508,8 @@ struct nfp_net {
u32 rx_offset;
struct bpf_prog *xdp_prog;
struct nfp_net_tx_ring *tx_rings;
struct nfp_net_rx_ring *rx_rings;
@ -532,6 +542,7 @@ struct nfp_net {
unsigned int max_rx_rings;
unsigned int num_tx_rings;
unsigned int num_stack_tx_rings;
unsigned int num_rx_rings;
int stride_tx;
@ -779,8 +790,8 @@ void nfp_net_coalesce_write_cfg(struct nfp_net *nn);
int nfp_net_irqs_alloc(struct nfp_net *nn);
void nfp_net_irqs_disable(struct nfp_net *nn);
int
nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_ring_set *rx,
struct nfp_net_ring_set *tx);
nfp_net_ring_reconfig(struct nfp_net *nn, struct bpf_prog **xdp_prog,
struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx);
#ifdef CONFIG_NFP_NET_DEBUG
void nfp_net_debugfs_create(void);

474
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -41,6 +41,7 @@
* Chris Telfer <chris.telfer@netronome.com>
*/
#include <linux/bpf.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
@ -490,6 +491,7 @@ static void nfp_net_irqs_assign(struct net_device *netdev)
nn->num_rx_rings = min(nn->num_r_vecs, nn->num_rx_rings);
nn->num_tx_rings = min(nn->num_r_vecs, nn->num_tx_rings);
nn->num_stack_tx_rings = nn->num_tx_rings;
nn->lsc_handler = nfp_net_irq_lsc;
nn->exn_handler = nfp_net_irq_exn;
@ -713,6 +715,13 @@ static void nfp_net_tx_csum(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
u64_stats_update_end(&r_vec->tx_sync);
}
static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring)
{
wmb();
nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add);
tx_ring->wr_ptr_add = 0;
}
/**
* nfp_net_tx() - Main transmit entry point
* @skb: SKB to transmit
@ -827,12 +836,8 @@ static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
nfp_net_tx_ring_stop(nd_q, tx_ring);
tx_ring->wr_ptr_add += nr_frags + 1;
if (!skb->xmit_more || netif_xmit_stopped(nd_q)) {
/* force memory write before we let HW know */
wmb();
nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add);
tx_ring->wr_ptr_add = 0;
}
if (!skb->xmit_more || netif_xmit_stopped(nd_q))
nfp_net_tx_xmit_more_flush(tx_ring);
skb_tx_timestamp(skb);
@ -954,6 +959,56 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
}
static void nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net *nn = r_vec->nfp_net;
u32 done_pkts = 0, done_bytes = 0;
int idx, todo;
u32 qcp_rd_p;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
if (qcp_rd_p == tx_ring->qcp_rd_p)
return;
if (qcp_rd_p > tx_ring->qcp_rd_p)
todo = qcp_rd_p - tx_ring->qcp_rd_p;
else
todo = qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p;
while (todo--) {
idx = tx_ring->rd_p & (tx_ring->cnt - 1);
tx_ring->rd_p++;
if (!tx_ring->txbufs[idx].frag)
continue;
nfp_net_dma_unmap_rx(nn, tx_ring->txbufs[idx].dma_addr,
nn->fl_bufsz, DMA_BIDIRECTIONAL);
__free_page(virt_to_page(tx_ring->txbufs[idx].frag));
done_pkts++;
done_bytes += tx_ring->txbufs[idx].real_len;
tx_ring->txbufs[idx].dma_addr = 0;
tx_ring->txbufs[idx].frag = NULL;
tx_ring->txbufs[idx].fidx = -2;
}
tx_ring->qcp_rd_p = qcp_rd_p;
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_bytes += done_bytes;
r_vec->tx_pkts += done_pkts;
u64_stats_update_end(&r_vec->tx_sync);
WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
"TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
}
/**
* nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers
* @nn: NFP Net device
@ -964,39 +1019,47 @@ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
static void
nfp_net_tx_ring_reset(struct nfp_net *nn, struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
const struct skb_frag_struct *frag;
struct netdev_queue *nd_q;
struct pci_dev *pdev = nn->pdev;
struct netdev_queue *nd_q;
while (tx_ring->rd_p != tx_ring->wr_p) {
int nr_frags, fidx, idx;
struct sk_buff *skb;
struct nfp_net_tx_buf *tx_buf;
int idx;
idx = tx_ring->rd_p & (tx_ring->cnt - 1);
skb = tx_ring->txbufs[idx].skb;
nr_frags = skb_shinfo(skb)->nr_frags;
fidx = tx_ring->txbufs[idx].fidx;
tx_buf = &tx_ring->txbufs[idx];
if (fidx == -1) {
/* unmap head */
dma_unmap_single(&pdev->dev,
tx_ring->txbufs[idx].dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
if (tx_ring == r_vec->xdp_ring) {
nfp_net_dma_unmap_rx(nn, tx_buf->dma_addr,
nn->fl_bufsz, DMA_BIDIRECTIONAL);
__free_page(virt_to_page(tx_ring->txbufs[idx].frag));
} else {
/* unmap fragment */
frag = &skb_shinfo(skb)->frags[fidx];
dma_unmap_page(&pdev->dev,
tx_ring->txbufs[idx].dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
struct sk_buff *skb = tx_ring->txbufs[idx].skb;
int nr_frags = skb_shinfo(skb)->nr_frags;
if (tx_buf->fidx == -1) {
/* unmap head */
dma_unmap_single(&pdev->dev, tx_buf->dma_addr,
skb_headlen(skb),
DMA_TO_DEVICE);
} else {
/* unmap fragment */
frag = &skb_shinfo(skb)->frags[tx_buf->fidx];
dma_unmap_page(&pdev->dev, tx_buf->dma_addr,
skb_frag_size(frag),
DMA_TO_DEVICE);
}
/* check for last gather fragment */
if (tx_buf->fidx == nr_frags - 1)
dev_kfree_skb_any(skb);
}
/* check for last gather fragment */
if (fidx == nr_frags - 1)
dev_kfree_skb_any(skb);
tx_ring->txbufs[idx].dma_addr = 0;
tx_ring->txbufs[idx].skb = NULL;
tx_ring->txbufs[idx].fidx = -2;
tx_buf->dma_addr = 0;
tx_buf->skb = NULL;
tx_buf->fidx = -2;
tx_ring->qcp_rd_p++;
tx_ring->rd_p++;
@ -1008,6 +1071,9 @@ nfp_net_tx_ring_reset(struct nfp_net *nn, struct nfp_net_tx_ring *tx_ring)
tx_ring->qcp_rd_p = 0;
tx_ring->wr_ptr_add = 0;
if (tx_ring == r_vec->xdp_ring)
return;
nd_q = netdev_get_tx_queue(nn->netdev, tx_ring->idx);
netdev_tx_reset_queue(nd_q);
}
@ -1017,7 +1083,7 @@ static void nfp_net_tx_timeout(struct net_device *netdev)
struct nfp_net *nn = netdev_priv(netdev);
int i;
for (i = 0; i < nn->num_tx_rings; i++) {
for (i = 0; i < nn->netdev->real_num_tx_queues; i++) {
if (!netif_tx_queue_stopped(netdev_get_tx_queue(netdev, i)))
continue;
nn_warn(nn, "TX timeout on ring: %d\n", i);
@ -1045,11 +1111,21 @@ nfp_net_calc_fl_bufsz(struct nfp_net *nn, unsigned int mtu)
return fl_bufsz;
}
static void
nfp_net_free_frag(void *frag, bool xdp)
{
if (!xdp)
skb_free_frag(frag);
else
__free_page(virt_to_page(frag));
}
/**
* nfp_net_rx_alloc_one() - Allocate and map page frag for RX
* @rx_ring: RX ring structure of the skb
* @dma_addr: Pointer to storage for DMA address (output param)
* @fl_bufsz: size of freelist buffers
* @xdp: Whether XDP is enabled
*
* This function will allcate a new page frag, map it for DMA.
*
@ -1057,20 +1133,26 @@ nfp_net_calc_fl_bufsz(struct nfp_net *nn, unsigned int mtu)
*/
static void *
nfp_net_rx_alloc_one(struct nfp_net_rx_ring *rx_ring, dma_addr_t *dma_addr,
unsigned int fl_bufsz)
unsigned int fl_bufsz, bool xdp)
{
struct nfp_net *nn = rx_ring->r_vec->nfp_net;
int direction;
void *frag;
frag = netdev_alloc_frag(fl_bufsz);
if (!xdp)
frag = netdev_alloc_frag(fl_bufsz);
else
frag = page_address(alloc_page(GFP_KERNEL | __GFP_COLD));
if (!frag) {
nn_warn_ratelimit(nn, "Failed to alloc receive page frag\n");
return NULL;
}
*dma_addr = nfp_net_dma_map_rx(nn, frag, fl_bufsz, DMA_FROM_DEVICE);
direction = xdp ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
*dma_addr = nfp_net_dma_map_rx(nn, frag, fl_bufsz, direction);
if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) {
skb_free_frag(frag);
nfp_net_free_frag(frag, xdp);
nn_warn_ratelimit(nn, "Failed to map DMA RX buffer\n");
return NULL;
}
@ -1078,19 +1160,23 @@ nfp_net_rx_alloc_one(struct nfp_net_rx_ring *rx_ring, dma_addr_t *dma_addr,
return frag;
}
static void *nfp_net_napi_alloc_one(struct nfp_net *nn, dma_addr_t *dma_addr)
static void *
nfp_net_napi_alloc_one(struct nfp_net *nn, int direction, dma_addr_t *dma_addr)
{
void *frag;
frag = napi_alloc_frag(nn->fl_bufsz);
if (!nn->xdp_prog)
frag = napi_alloc_frag(nn->fl_bufsz);
else
frag = page_address(alloc_page(GFP_ATOMIC | __GFP_COLD));
if (!frag) {
nn_warn_ratelimit(nn, "Failed to alloc receive page frag\n");
return NULL;
}
*dma_addr = nfp_net_dma_map_rx(nn, frag, nn->fl_bufsz, DMA_FROM_DEVICE);
*dma_addr = nfp_net_dma_map_rx(nn, frag, nn->fl_bufsz, direction);
if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) {
skb_free_frag(frag);
nfp_net_free_frag(frag, nn->xdp_prog);
nn_warn_ratelimit(nn, "Failed to map DMA RX buffer\n");
return NULL;
}
@ -1161,14 +1247,17 @@ static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring)
* nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring
* @nn: NFP Net device
* @rx_ring: RX ring to remove buffers from
* @xdp: Whether XDP is enabled
*
* Assumes that the device is stopped and buffers are in [0, ring->cnt - 1)
* entries. After device is disabled nfp_net_rx_ring_reset() must be called
* to restore required ring geometry.
*/
static void
nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring,
bool xdp)
{
int direction = xdp ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
unsigned int i;
for (i = 0; i < rx_ring->cnt - 1; i++) {
@ -1180,8 +1269,8 @@ nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
continue;
nfp_net_dma_unmap_rx(nn, rx_ring->rxbufs[i].dma_addr,
rx_ring->bufsz, DMA_FROM_DEVICE);
skb_free_frag(rx_ring->rxbufs[i].frag);
rx_ring->bufsz, direction);
nfp_net_free_frag(rx_ring->rxbufs[i].frag, xdp);
rx_ring->rxbufs[i].dma_addr = 0;
rx_ring->rxbufs[i].frag = NULL;
}
@ -1191,9 +1280,11 @@ nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
* nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW)
* @nn: NFP Net device
* @rx_ring: RX ring to remove buffers from
* @xdp: Whether XDP is enabled
*/
static int
nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring,
bool xdp)
{
struct nfp_net_rx_buf *rxbufs;
unsigned int i;
@ -1203,9 +1294,9 @@ nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
for (i = 0; i < rx_ring->cnt - 1; i++) {
rxbufs[i].frag =
nfp_net_rx_alloc_one(rx_ring, &rxbufs[i].dma_addr,
rx_ring->bufsz);
rx_ring->bufsz, xdp);
if (!rxbufs[i].frag) {
nfp_net_rx_ring_bufs_free(nn, rx_ring);
nfp_net_rx_ring_bufs_free(nn, rx_ring, xdp);
return -ENOMEM;
}
}
@ -1368,6 +1459,68 @@ nfp_net_rx_drop(struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring,
dev_kfree_skb_any(skb);
}
static void
nfp_net_tx_xdp_buf(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring,
struct nfp_net_tx_ring *tx_ring,
struct nfp_net_rx_buf *rxbuf, unsigned int pkt_off,
unsigned int pkt_len)
{
struct nfp_net_tx_buf *txbuf;
struct nfp_net_tx_desc *txd;
dma_addr_t new_dma_addr;
void *new_frag;
int wr_idx;
if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
nfp_net_rx_drop(rx_ring->r_vec, rx_ring, rxbuf, NULL);
return;
}
new_frag = nfp_net_napi_alloc_one(nn, DMA_BIDIRECTIONAL, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_net_rx_drop(rx_ring->r_vec, rx_ring, rxbuf, NULL);
return;
}
nfp_net_rx_give_one(rx_ring, new_frag, new_dma_addr);
wr_idx = tx_ring->wr_p & (tx_ring->cnt - 1);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
txbuf->frag = rxbuf->frag;
txbuf->dma_addr = rxbuf->dma_addr;
txbuf->fidx = -1;
txbuf->pkt_cnt = 1;
txbuf->real_len = pkt_len;
dma_sync_single_for_device(&nn->pdev->dev, rxbuf->dma_addr + pkt_off,
pkt_len, DMA_TO_DEVICE);
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = PCIE_DESC_TX_EOP;
txd->dma_len = cpu_to_le16(pkt_len);
nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + pkt_off);
txd->data_len = cpu_to_le16(pkt_len);
txd->flags = 0;
txd->mss = 0;
txd->l4_offset = 0;
tx_ring->wr_p++;
tx_ring->wr_ptr_add++;
}
static int nfp_net_run_xdp(struct bpf_prog *prog, void *data, unsigned int len)
{
struct xdp_buff xdp;
xdp.data = data;
xdp.data_end = data + len;
return BPF_PROG_RUN(prog, (void *)&xdp);
}
/**
* nfp_net_rx() - receive up to @budget packets on @rx_ring
* @rx_ring: RX ring to receive from
@ -1383,10 +1536,20 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net *nn = r_vec->nfp_net;
struct nfp_net_tx_ring *tx_ring;
struct bpf_prog *xdp_prog;
unsigned int true_bufsz;
struct sk_buff *skb;
int pkts_polled = 0;
int rx_dma_map_dir;
int idx;
rcu_read_lock();
xdp_prog = READ_ONCE(nn->xdp_prog);
rx_dma_map_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
true_bufsz = xdp_prog ? PAGE_SIZE : nn->fl_bufsz;
tx_ring = r_vec->xdp_ring;
while (pkts_polled < budget) {
unsigned int meta_len, data_len, data_off, pkt_len, pkt_off;
struct nfp_net_rx_buf *rxbuf;
@ -1437,19 +1600,45 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
r_vec->rx_bytes += pkt_len;
u64_stats_update_end(&r_vec->rx_sync);
skb = build_skb(rxbuf->frag, nn->fl_bufsz);
if (xdp_prog) {
int act;
dma_sync_single_for_cpu(&nn->pdev->dev,
rxbuf->dma_addr + pkt_off,
pkt_len, DMA_FROM_DEVICE);
act = nfp_net_run_xdp(xdp_prog, rxbuf->frag + data_off,
pkt_len);
switch (act) {
case XDP_PASS:
break;
case XDP_TX:
nfp_net_tx_xdp_buf(nn, rx_ring, tx_ring, rxbuf,
pkt_off, pkt_len);
continue;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
case XDP_DROP:
nfp_net_rx_give_one(rx_ring, rxbuf->frag,
rxbuf->dma_addr);
continue;
}
}
skb = build_skb(rxbuf->frag, true_bufsz);
if (unlikely(!skb)) {
nfp_net_rx_drop(r_vec, rx_ring, rxbuf, NULL);
continue;
}
new_frag = nfp_net_napi_alloc_one(nn, &new_dma_addr);
new_frag = nfp_net_napi_alloc_one(nn, rx_dma_map_dir,
&new_dma_addr);
if (unlikely(!new_frag)) {
nfp_net_rx_drop(r_vec, rx_ring, rxbuf, skb);
continue;
}
nfp_net_dma_unmap_rx(nn, rx_ring->rxbufs[idx].dma_addr,
nn->fl_bufsz, DMA_FROM_DEVICE);
nfp_net_dma_unmap_rx(nn, rxbuf->dma_addr, nn->fl_bufsz,
rx_dma_map_dir);
nfp_net_rx_give_one(rx_ring, new_frag, new_dma_addr);
@ -1481,6 +1670,10 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
napi_gro_receive(&rx_ring->r_vec->napi, skb);
}
if (xdp_prog && tx_ring->wr_ptr_add)
nfp_net_tx_xmit_more_flush(tx_ring);
rcu_read_unlock();
return pkts_polled;
}
@ -1499,8 +1692,11 @@ static int nfp_net_poll(struct napi_struct *napi, int budget)
if (r_vec->tx_ring)
nfp_net_tx_complete(r_vec->tx_ring);
if (r_vec->rx_ring)
if (r_vec->rx_ring) {
pkts_polled = nfp_net_rx(r_vec->rx_ring, budget);
if (r_vec->xdp_ring)
nfp_net_xdp_complete(r_vec->xdp_ring);
}
if (pkts_polled < budget) {
napi_complete_done(napi, pkts_polled);
@ -1540,10 +1736,12 @@ static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
* nfp_net_tx_ring_alloc() - Allocate resource for a TX ring
* @tx_ring: TX Ring structure to allocate
* @cnt: Ring buffer count
* @is_xdp: True if ring will be used for XDP
*
* Return: 0 on success, negative errno otherwise.
*/
static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring, u32 cnt)
static int
nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring, u32 cnt, bool is_xdp)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net *nn = r_vec->nfp_net;
@ -1563,11 +1761,14 @@ static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring, u32 cnt)
if (!tx_ring->txbufs)
goto err_alloc;
netif_set_xps_queue(nn->netdev, &r_vec->affinity_mask, tx_ring->idx);
if (!is_xdp)
netif_set_xps_queue(nn->netdev, &r_vec->affinity_mask,
tx_ring->idx);
nn_dbg(nn, "TxQ%02d: QCidx=%02d cnt=%d dma=%#llx host=%p\n",
nn_dbg(nn, "TxQ%02d: QCidx=%02d cnt=%d dma=%#llx host=%p %s\n",
tx_ring->idx, tx_ring->qcidx,
tx_ring->cnt, (unsigned long long)tx_ring->dma, tx_ring->txds);
tx_ring->cnt, (unsigned long long)tx_ring->dma, tx_ring->txds,
is_xdp ? "XDP" : "");
return 0;
@ -1577,7 +1778,8 @@ err_alloc:
}
static struct nfp_net_tx_ring *
nfp_net_tx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s)
nfp_net_tx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s,
unsigned int num_stack_tx_rings)
{
struct nfp_net_tx_ring *rings;
unsigned int r;
@ -1587,9 +1789,14 @@ nfp_net_tx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s)
return NULL;
for (r = 0; r < s->n_rings; r++) {
nfp_net_tx_ring_init(&rings[r], &nn->r_vecs[r], r);
int bias = 0;
if (nfp_net_tx_ring_alloc(&rings[r], s->dcnt))
if (r >= num_stack_tx_rings)
bias = num_stack_tx_rings;
nfp_net_tx_ring_init(&rings[r], &nn->r_vecs[r - bias], r);
if (nfp_net_tx_ring_alloc(&rings[r], s->dcnt, bias))
goto err_free_prev;
}
@ -1694,7 +1901,8 @@ err_alloc:
}
static struct nfp_net_rx_ring *
nfp_net_rx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s)
nfp_net_rx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s,
bool xdp)
{
unsigned int fl_bufsz = nfp_net_calc_fl_bufsz(nn, s->mtu);
struct nfp_net_rx_ring *rings;
@ -1710,7 +1918,7 @@ nfp_net_rx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s)
if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz, s->dcnt))
goto err_free_prev;
if (nfp_net_rx_ring_bufs_alloc(nn, &rings[r]))
if (nfp_net_rx_ring_bufs_alloc(nn, &rings[r], xdp))
goto err_free_ring;
}
@ -1718,7 +1926,7 @@ nfp_net_rx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s)
err_free_prev:
while (r--) {
nfp_net_rx_ring_bufs_free(nn, &rings[r]);
nfp_net_rx_ring_bufs_free(nn, &rings[r], xdp);
err_free_ring:
nfp_net_rx_ring_free(&rings[r]);
}
@ -1744,13 +1952,14 @@ nfp_net_rx_ring_set_swap(struct nfp_net *nn, struct nfp_net_ring_set *s)
}
static void
nfp_net_rx_ring_set_free(struct nfp_net *nn, struct nfp_net_ring_set *s)
nfp_net_rx_ring_set_free(struct nfp_net *nn, struct nfp_net_ring_set *s,
bool xdp)
{
struct nfp_net_rx_ring *rings = s->rings;
unsigned int r;
for (r = 0; r < s->n_rings; r++) {
nfp_net_rx_ring_bufs_free(nn, &rings[r]);
nfp_net_rx_ring_bufs_free(nn, &rings[r], xdp);
nfp_net_rx_ring_free(&rings[r]);
}
@ -1762,7 +1971,11 @@ nfp_net_vector_assign_rings(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
int idx)
{
r_vec->rx_ring = idx < nn->num_rx_rings ? &nn->rx_rings[idx] : NULL;
r_vec->tx_ring = idx < nn->num_tx_rings ? &nn->tx_rings[idx] : NULL;
r_vec->tx_ring =
idx < nn->num_stack_tx_rings ? &nn->tx_rings[idx] : NULL;
r_vec->xdp_ring = idx < nn->num_tx_rings - nn->num_stack_tx_rings ?
&nn->tx_rings[nn->num_stack_tx_rings + idx] : NULL;
}
static int
@ -2083,13 +2296,14 @@ static int nfp_net_netdev_open(struct net_device *netdev)
goto err_cleanup_vec_p;
}
nn->rx_rings = nfp_net_rx_ring_set_prepare(nn, &rx);
nn->rx_rings = nfp_net_rx_ring_set_prepare(nn, &rx, nn->xdp_prog);
if (!nn->rx_rings) {
err = -ENOMEM;
goto err_cleanup_vec;
}
nn->tx_rings = nfp_net_tx_ring_set_prepare(nn, &tx);
nn->tx_rings = nfp_net_tx_ring_set_prepare(nn, &tx,
nn->num_stack_tx_rings);
if (!nn->tx_rings) {
err = -ENOMEM;
goto err_free_rx_rings;
@ -2098,7 +2312,7 @@ static int nfp_net_netdev_open(struct net_device *netdev)
for (r = 0; r < nn->max_r_vecs; r++)
nfp_net_vector_assign_rings(nn, &nn->r_vecs[r], r);
err = netif_set_real_num_tx_queues(netdev, nn->num_tx_rings);
err = netif_set_real_num_tx_queues(netdev, nn->num_stack_tx_rings);
if (err)
goto err_free_rings;
@ -2130,7 +2344,7 @@ static int nfp_net_netdev_open(struct net_device *netdev)
err_free_rings:
nfp_net_tx_ring_set_free(nn, &tx);
err_free_rx_rings:
nfp_net_rx_ring_set_free(nn, &rx);
nfp_net_rx_ring_set_free(nn, &rx, nn->xdp_prog);
err_cleanup_vec:
r = nn->num_r_vecs;
err_cleanup_vec_p:
@ -2171,7 +2385,7 @@ static void nfp_net_close_free_all(struct nfp_net *nn)
unsigned int r;
for (r = 0; r < nn->num_rx_rings; r++) {
nfp_net_rx_ring_bufs_free(nn, &nn->rx_rings[r]);
nfp_net_rx_ring_bufs_free(nn, &nn->rx_rings[r], nn->xdp_prog);
nfp_net_rx_ring_free(&nn->rx_rings[r]);
}
for (r = 0; r < nn->num_tx_rings; r++)
@ -2251,6 +2465,8 @@ static void nfp_net_rss_init_itbl(struct nfp_net *nn)
static int
nfp_net_ring_swap_enable(struct nfp_net *nn, unsigned int *num_vecs,
unsigned int *stack_tx_rings,
struct bpf_prog **xdp_prog,
struct nfp_net_ring_set *rx,
struct nfp_net_ring_set *tx)
{
@ -2263,6 +2479,8 @@ nfp_net_ring_swap_enable(struct nfp_net *nn, unsigned int *num_vecs,
nfp_net_tx_ring_set_swap(nn, tx);
swap(*num_vecs, nn->num_r_vecs);
swap(*stack_tx_rings, nn->num_stack_tx_rings);
*xdp_prog = xchg(&nn->xdp_prog, *xdp_prog);
for (r = 0; r < nn->max_r_vecs; r++)
nfp_net_vector_assign_rings(nn, &nn->r_vecs[r], r);
@ -2277,9 +2495,9 @@ nfp_net_ring_swap_enable(struct nfp_net *nn, unsigned int *num_vecs,
return err;
}
if (nn->netdev->real_num_tx_queues != nn->num_tx_rings) {
if (nn->netdev->real_num_tx_queues != nn->num_stack_tx_rings) {
err = netif_set_real_num_tx_queues(nn->netdev,
nn->num_tx_rings);
nn->num_stack_tx_rings);
if (err)
return err;
}
@ -2287,11 +2505,30 @@ nfp_net_ring_swap_enable(struct nfp_net *nn, unsigned int *num_vecs,
return __nfp_net_set_config_and_enable(nn);
}
static int
nfp_net_check_config(struct nfp_net *nn, struct bpf_prog *xdp_prog,
struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx)
{
/* XDP-enabled tests */
if (!xdp_prog)
return 0;
if (rx && nfp_net_calc_fl_bufsz(nn, rx->mtu) > PAGE_SIZE) {
nn_warn(nn, "MTU too large w/ XDP enabled\n");
return -EINVAL;
}
if (tx && tx->n_rings > nn->max_tx_rings) {
nn_warn(nn, "Insufficient number of TX rings w/ XDP enabled\n");
return -EINVAL;
}
return 0;
}
static void
nfp_net_ring_reconfig_down(struct nfp_net *nn,
nfp_net_ring_reconfig_down(struct nfp_net *nn, struct bpf_prog **xdp_prog,
struct nfp_net_ring_set *rx,
struct nfp_net_ring_set *tx,
unsigned int num_vecs)
unsigned int stack_tx_rings, unsigned int num_vecs)
{
nn->netdev->mtu = rx ? rx->mtu : nn->netdev->mtu;
nn->fl_bufsz = nfp_net_calc_fl_bufsz(nn, nn->netdev->mtu);
@ -2299,24 +2536,34 @@ nfp_net_ring_reconfig_down(struct nfp_net *nn,
nn->txd_cnt = tx ? tx->dcnt : nn->txd_cnt;
nn->num_rx_rings = rx ? rx->n_rings : nn->num_rx_rings;
nn->num_tx_rings = tx ? tx->n_rings : nn->num_tx_rings;
nn->num_stack_tx_rings = stack_tx_rings;
nn->num_r_vecs = num_vecs;
*xdp_prog = xchg(&nn->xdp_prog, *xdp_prog);
if (!netif_is_rxfh_configured(nn->netdev))
nfp_net_rss_init_itbl(nn);
}
int
nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_ring_set *rx,
struct nfp_net_ring_set *tx)
nfp_net_ring_reconfig(struct nfp_net *nn, struct bpf_prog **xdp_prog,
struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx)
{
unsigned int num_vecs, r;
unsigned int stack_tx_rings, num_vecs, r;
int err;
num_vecs = max(rx ? rx->n_rings : nn->num_rx_rings,
tx ? tx->n_rings : nn->num_tx_rings);
stack_tx_rings = tx ? tx->n_rings : nn->num_tx_rings;
if (*xdp_prog)
stack_tx_rings -= rx ? rx->n_rings : nn->num_rx_rings;
num_vecs = max(rx ? rx->n_rings : nn->num_rx_rings, stack_tx_rings);
err = nfp_net_check_config(nn, *xdp_prog, rx, tx);
if (err)
return err;
if (!netif_running(nn->netdev)) {
nfp_net_ring_reconfig_down(nn, rx, tx, num_vecs);
nfp_net_ring_reconfig_down(nn, xdp_prog, rx, tx,
stack_tx_rings, num_vecs);
return 0;
}
@ -2329,13 +2576,13 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_ring_set *rx,
}
}
if (rx) {
if (!nfp_net_rx_ring_set_prepare(nn, rx)) {
if (!nfp_net_rx_ring_set_prepare(nn, rx, *xdp_prog)) {
err = -ENOMEM;
goto err_cleanup_vecs;
}
}
if (tx) {
if (!nfp_net_tx_ring_set_prepare(nn, tx)) {
if (!nfp_net_tx_ring_set_prepare(nn, tx, stack_tx_rings)) {
err = -ENOMEM;
goto err_free_rx;
}
@ -2345,14 +2592,16 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_ring_set *rx,
nfp_net_close_stack(nn);
nfp_net_clear_config_and_disable(nn);
err = nfp_net_ring_swap_enable(nn, &num_vecs, rx, tx);
err = nfp_net_ring_swap_enable(nn, &num_vecs, &stack_tx_rings,
xdp_prog, rx, tx);
if (err) {
int err2;
nfp_net_clear_config_and_disable(nn);
/* Try with old configuration and old rings */
err2 = nfp_net_ring_swap_enable(nn, &num_vecs, rx, tx);
err2 = nfp_net_ring_swap_enable(nn, &num_vecs, &stack_tx_rings,
xdp_prog, rx, tx);
if (err2)
nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n",
err, err2);
@ -2361,7 +2610,7 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_ring_set *rx,
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
if (rx)
nfp_net_rx_ring_set_free(nn, rx);
nfp_net_rx_ring_set_free(nn, rx, *xdp_prog);
if (tx)
nfp_net_tx_ring_set_free(nn, tx);
@ -2371,7 +2620,7 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_ring_set *rx,
err_free_rx:
if (rx)
nfp_net_rx_ring_set_free(nn, rx);
nfp_net_rx_ring_set_free(nn, rx, *xdp_prog);
err_cleanup_vecs:
for (r = num_vecs - 1; r >= nn->num_r_vecs; r--)
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
@ -2387,7 +2636,7 @@ static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
.dcnt = nn->rxd_cnt,
};
return nfp_net_ring_reconfig(nn, &rx, NULL);
return nfp_net_ring_reconfig(nn, &nn->xdp_prog, &rx, NULL);
}
static struct rtnl_link_stats64 *nfp_net_stat64(struct net_device *netdev,
@ -2653,6 +2902,56 @@ static void nfp_net_del_vxlan_port(struct net_device *netdev,
nfp_net_set_vxlan_port(nn, idx, 0);
}
static int nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog)
{
struct nfp_net_ring_set rx = {
.n_rings = nn->num_rx_rings,
.mtu = nn->netdev->mtu,
.dcnt = nn->rxd_cnt,
};
struct nfp_net_ring_set tx = {
.n_rings = nn->num_tx_rings,
.dcnt = nn->txd_cnt,
};
int err;
if (!prog && !nn->xdp_prog)
return 0;
if (prog && nn->xdp_prog) {
prog = xchg(&nn->xdp_prog, prog);
bpf_prog_put(prog);
return 0;
}
tx.n_rings += prog ? nn->num_rx_rings : -nn->num_rx_rings;
/* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */
err = nfp_net_ring_reconfig(nn, &prog, &rx, &tx);
if (err)
return err;
/* @prog got swapped and is now the old one */
if (prog)
bpf_prog_put(prog);
return 0;
}
static int nfp_net_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
{
struct nfp_net *nn = netdev_priv(netdev);
switch (xdp->command) {
case XDP_SETUP_PROG:
return nfp_net_xdp_setup(nn, xdp->prog);
case XDP_QUERY_PROG:
xdp->prog_attached = !!nn->xdp_prog;
return 0;
default:
return -EINVAL;
}
}
static const struct net_device_ops nfp_net_netdev_ops = {
.ndo_open = nfp_net_netdev_open,
.ndo_stop = nfp_net_netdev_close,
@ -2667,6 +2966,7 @@ static const struct net_device_ops nfp_net_netdev_ops = {
.ndo_features_check = nfp_net_features_check,
.ndo_udp_tunnel_add = nfp_net_add_vxlan_port,
.ndo_udp_tunnel_del = nfp_net_del_vxlan_port,
.ndo_xdp = nfp_net_xdp,
};
/**
@ -2929,5 +3229,9 @@ int nfp_net_netdev_init(struct net_device *netdev)
*/
void nfp_net_netdev_clean(struct net_device *netdev)
{
unregister_netdev(netdev);
struct nfp_net *nn = netdev_priv(netdev);
if (nn->xdp_prog)
bpf_prog_put(nn->xdp_prog);
unregister_netdev(nn->netdev);
}

37
drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c
View File

@ -114,6 +114,16 @@ static const struct file_operations nfp_rx_q_fops = {
.llseek = seq_lseek
};
static int nfp_net_debugfs_tx_q_open(struct inode *inode, struct file *f);
static const struct file_operations nfp_tx_q_fops = {
.owner = THIS_MODULE,
.open = nfp_net_debugfs_tx_q_open,
.release = single_release,
.read = seq_read,
.llseek = seq_lseek
};
static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
{
struct nfp_net_r_vector *r_vec = file->private;
@ -126,10 +136,13 @@ static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
rtnl_lock();
if (!r_vec->nfp_net || !r_vec->tx_ring)
if (debugfs_real_fops(file->file) == &nfp_tx_q_fops)
tx_ring = r_vec->tx_ring;
else
tx_ring = r_vec->xdp_ring;
if (!r_vec->nfp_net || !tx_ring)
goto out;
nn = r_vec->nfp_net;
tx_ring = r_vec->tx_ring;
if (!netif_running(nn->netdev))
goto out;
@ -148,9 +161,14 @@ static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
txd->vals[2], txd->vals[3]);
skb = READ_ONCE(tx_ring->txbufs[i].skb);
if (skb)
seq_printf(file, " skb->head=%p skb->data=%p",
skb->head, skb->data);
if (skb) {
if (tx_ring == r_vec->tx_ring)
seq_printf(file, " skb->head=%p skb->data=%p",
skb->head, skb->data);
else
seq_printf(file, " frag=%p", skb);
}
if (tx_ring->txbufs[i].dma_addr)
seq_printf(file, " dma_addr=%pad",
&tx_ring->txbufs[i].dma_addr);
@ -176,7 +194,7 @@ static int nfp_net_debugfs_tx_q_open(struct inode *inode, struct file *f)
return single_open(f, nfp_net_debugfs_tx_q_read, inode->i_private);
}
static const struct file_operations nfp_tx_q_fops = {
static const struct file_operations nfp_xdp_q_fops = {
.owner = THIS_MODULE,
.open = nfp_net_debugfs_tx_q_open,
.release = single_release,
@ -186,7 +204,7 @@ static const struct file_operations nfp_tx_q_fops = {
void nfp_net_debugfs_adapter_add(struct nfp_net *nn)
{
struct dentry *queues, *tx, *rx;
struct dentry *queues, *tx, *rx, *xdp;
char int_name[16];
int i;
@ -204,13 +222,16 @@ void nfp_net_debugfs_adapter_add(struct nfp_net *nn)
rx = debugfs_create_dir("rx", queues);
tx = debugfs_create_dir("tx", queues);
if (IS_ERR_OR_NULL(rx) || IS_ERR_OR_NULL(tx))
xdp = debugfs_create_dir("xdp", queues);
if (IS_ERR_OR_NULL(rx) || IS_ERR_OR_NULL(tx) || IS_ERR_OR_NULL(xdp))
return;
for (i = 0; i < min(nn->max_rx_rings, nn->max_r_vecs); i++) {
sprintf(int_name, "%d", i);
debugfs_create_file(int_name, S_IRUSR, rx,
&nn->r_vecs[i], &nfp_rx_q_fops);
debugfs_create_file(int_name, S_IRUSR, xdp,
&nn->r_vecs[i], &nfp_xdp_q_fops);
}
for (i = 0; i < min(nn->max_tx_rings, nn->max_r_vecs); i++) {

22
drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
View File

@ -176,7 +176,8 @@ static int nfp_net_set_ring_size(struct nfp_net *nn, u32 rxd_cnt, u32 txd_cnt)
if (nn->txd_cnt != txd_cnt)
reconfig_tx = &tx;
return nfp_net_ring_reconfig(nn, reconfig_rx, reconfig_tx);
return nfp_net_ring_reconfig(nn, &nn->xdp_prog,
reconfig_rx, reconfig_tx);
}
static int nfp_net_set_ringparam(struct net_device *netdev,
@ -639,14 +640,19 @@ static void nfp_net_get_channels(struct net_device *netdev,
struct ethtool_channels *channel)
{
struct nfp_net *nn = netdev_priv(netdev);
unsigned int num_tx_rings;
num_tx_rings = nn->num_tx_rings;
if (nn->xdp_prog)
num_tx_rings -= nn->num_rx_rings;
channel->max_rx = min(nn->max_rx_rings, nn->max_r_vecs);
channel->max_tx = min(nn->max_tx_rings, nn->max_r_vecs);
channel->max_combined = min(channel->max_rx, channel->max_tx);
channel->max_other = NFP_NET_NON_Q_VECTORS;
channel->combined_count = min(nn->num_rx_rings, nn->num_tx_rings);
channel->combined_count = min(nn->num_rx_rings, num_tx_rings);
channel->rx_count = nn->num_rx_rings - channel->combined_count;
channel->tx_count = nn->num_tx_rings - channel->combined_count;
channel->tx_count = num_tx_rings - channel->combined_count;
channel->other_count = NFP_NET_NON_Q_VECTORS;
}
@ -666,10 +672,16 @@ static int nfp_net_set_num_rings(struct nfp_net *nn, unsigned int total_rx,
if (nn->num_rx_rings != total_rx)
reconfig_rx = &rx;
if (nn->num_tx_rings != total_tx)
if (nn->num_stack_tx_rings != total_tx ||
(nn->xdp_prog && reconfig_rx))
reconfig_tx = &tx;
return nfp_net_ring_reconfig(nn, reconfig_rx, reconfig_tx);
/* nfp_net_check_config() will catch tx.n_rings > nn->max_tx_rings */
if (nn->xdp_prog)
tx.n_rings += total_rx;
return nfp_net_ring_reconfig(nn, &nn->xdp_prog,
reconfig_rx, reconfig_tx);
}
static int nfp_net_set_channels(struct net_device *netdev,