Commit 496e0517 authored by Mintz, Yuval's avatar Mintz, Yuval Committed by David S. Miller

qede: Add basic XDP support

Add support for the ndo_xdp callback. This patch would support XDP_PASS,
XDP_DROP and XDP_ABORTED commands.

This also adds a per Rx queue statistic which counts number of packets
which didn't reach the stack [due to XDP].
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9eb22357
......@@ -16,6 +16,7 @@
#include <linux/bitmap.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/bpf.h>
#include <linux/io.h>
#include <linux/qed/common_hsi.h>
#include <linux/qed/eth_common.h>
......@@ -187,6 +188,8 @@ struct qede_dev {
bool wol_enabled;
struct qede_rdma_dev rdma_info;
struct bpf_prog *xdp_prog;
};
enum QEDE_STATE {
......@@ -249,6 +252,8 @@ struct qede_rx_queue {
/* Required for the allocation of replacement buffers */
struct device *dev;
struct bpf_prog *xdp_prog;
u16 sw_rx_cons;
u16 sw_rx_prod;
......@@ -271,6 +276,8 @@ struct qede_rx_queue {
u64 rx_alloc_errors;
u64 rx_ip_frags;
u64 xdp_no_pass;
void *handle;
};
......@@ -325,6 +332,7 @@ struct qede_fastpath {
struct qede_dev *edev;
#define QEDE_FASTPATH_TX BIT(0)
#define QEDE_FASTPATH_RX BIT(1)
#define QEDE_FASTPATH_XDP BIT(2)
#define QEDE_FASTPATH_COMBINED (QEDE_FASTPATH_TX | QEDE_FASTPATH_RX)
u8 type;
u8 id;
......@@ -358,6 +366,7 @@ struct qede_reload_args {
void (*func)(struct qede_dev *edev, struct qede_reload_args *args);
union {
netdev_features_t features;
struct bpf_prog *new_prog;
u16 mtu;
} u;
};
......
......@@ -32,6 +32,7 @@ static const struct {
QEDE_RQSTAT(rx_hw_errors),
QEDE_RQSTAT(rx_alloc_errors),
QEDE_RQSTAT(rx_ip_frags),
QEDE_RQSTAT(xdp_no_pass),
};
#define QEDE_NUM_RQSTATS ARRAY_SIZE(qede_rqstats_arr)
......
......@@ -1418,6 +1418,39 @@ static bool qede_pkt_is_ip_fragmented(struct eth_fast_path_rx_reg_cqe *cqe,
return false;
}
/* Return true iff packet is to be passed to stack */
static bool qede_rx_xdp(struct qede_dev *edev,
struct qede_fastpath *fp,
struct qede_rx_queue *rxq,
struct bpf_prog *prog,
struct sw_rx_data *bd,
struct eth_fast_path_rx_reg_cqe *cqe)
{
u16 len = le16_to_cpu(cqe->len_on_first_bd);
struct xdp_buff xdp;
enum xdp_action act;
xdp.data = page_address(bd->data) + cqe->placement_offset;
xdp.data_end = xdp.data + len;
act = bpf_prog_run_xdp(prog, &xdp);
if (act == XDP_PASS)
return true;
/* Count number of packets not to be passed to stack */
rxq->xdp_no_pass++;
switch (act) {
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
case XDP_DROP:
qede_recycle_rx_bd_ring(rxq, cqe->bd_num);
}
return false;
}
static struct sk_buff *qede_rx_allocate_skb(struct qede_dev *edev,
struct qede_rx_queue *rxq,
struct sw_rx_data *bd, u16 len,
......@@ -1560,6 +1593,7 @@ static int qede_rx_process_cqe(struct qede_dev *edev,
struct qede_fastpath *fp,
struct qede_rx_queue *rxq)
{
struct bpf_prog *xdp_prog = READ_ONCE(rxq->xdp_prog);
struct eth_fast_path_rx_reg_cqe *fp_cqe;
u16 len, pad, bd_cons_idx, parse_flag;
enum eth_rx_cqe_type cqe_type;
......@@ -1596,6 +1630,11 @@ static int qede_rx_process_cqe(struct qede_dev *edev,
len = le16_to_cpu(fp_cqe->len_on_first_bd);
pad = fp_cqe->placement_offset;
/* Run eBPF program if one is attached */
if (xdp_prog)
if (!qede_rx_xdp(edev, fp, rxq, xdp_prog, bd, fp_cqe))
return 1;
/* If this is an error packet then drop it */
flags = cqe->fast_path_regular.pars_flags.flags;
parse_flag = le16_to_cpu(flags);
......@@ -2226,7 +2265,16 @@ int qede_set_features(struct net_device *dev, netdev_features_t features)
args.u.features = features;
args.func = &qede_set_features_reload;
qede_reload(edev, &args, false);
/* Make sure that we definitely need to reload.
* In case of an eBPF attached program, there will be no FW
* aggregations, so no need to actually reload.
*/
__qede_lock(edev);
if (edev->xdp_prog)
args.func(edev, &args);
else
qede_reload(edev, &args, true);
__qede_unlock(edev);
return 1;
}
......@@ -2338,6 +2386,43 @@ static netdev_features_t qede_features_check(struct sk_buff *skb,
return features;
}
static void qede_xdp_reload_func(struct qede_dev *edev,
struct qede_reload_args *args)
{
struct bpf_prog *old;
old = xchg(&edev->xdp_prog, args->u.new_prog);
if (old)
bpf_prog_put(old);
}
static int qede_xdp_set(struct qede_dev *edev, struct bpf_prog *prog)
{
struct qede_reload_args args;
/* If we're called, there was already a bpf reference increment */
args.func = &qede_xdp_reload_func;
args.u.new_prog = prog;
qede_reload(edev, &args, false);
return 0;
}
static int qede_xdp(struct net_device *dev, struct netdev_xdp *xdp)
{
struct qede_dev *edev = netdev_priv(dev);
switch (xdp->command) {
case XDP_SETUP_PROG:
return qede_xdp_set(edev, xdp->prog);
case XDP_QUERY_PROG:
xdp->prog_attached = !!edev->xdp_prog;
return 0;
default:
return -EINVAL;
}
}
static const struct net_device_ops qede_netdev_ops = {
.ndo_open = qede_open,
.ndo_stop = qede_close,
......@@ -2363,6 +2448,7 @@ static const struct net_device_ops qede_netdev_ops = {
.ndo_udp_tunnel_add = qede_udp_tunnel_add,
.ndo_udp_tunnel_del = qede_udp_tunnel_del,
.ndo_features_check = qede_features_check,
.ndo_xdp = qede_xdp,
};
/* -------------------------------------------------------------------------
......@@ -2559,6 +2645,9 @@ static int qede_alloc_fp_array(struct qede_dev *edev)
fp->rxq = kzalloc(sizeof(*fp->rxq), GFP_KERNEL);
if (!fp->rxq)
goto err;
if (edev->xdp_prog)
fp->type |= QEDE_FASTPATH_XDP;
}
}
......@@ -2756,6 +2845,10 @@ static void __qede_remove(struct pci_dev *pdev, enum qede_remove_mode mode)
pci_set_drvdata(pdev, NULL);
/* Release edev's reference to XDP's bpf if such exist */
if (edev->xdp_prog)
bpf_prog_put(edev->xdp_prog);
free_netdev(ndev);
/* Use global ops since we've freed edev */
......@@ -2907,6 +3000,10 @@ static int qede_alloc_sge_mem(struct qede_dev *edev, struct qede_rx_queue *rxq)
dma_addr_t mapping;
int i;
/* Don't perform FW aggregations in case of XDP */
if (edev->xdp_prog)
edev->gro_disable = 1;
if (edev->gro_disable)
return 0;
......@@ -2959,8 +3056,13 @@ static int qede_alloc_mem_rxq(struct qede_dev *edev, struct qede_rx_queue *rxq)
if (rxq->rx_buf_size > PAGE_SIZE)
rxq->rx_buf_size = PAGE_SIZE;
/* Segment size to spilt a page in multiple equal parts */
/* Segment size to spilt a page in multiple equal parts,
* unless XDP is used in which case we'd use the entire page.
*/
if (!edev->xdp_prog)
rxq->rx_buf_seg_size = roundup_pow_of_two(rxq->rx_buf_size);
else
rxq->rx_buf_seg_size = PAGE_SIZE;
/* Allocate the parallel driver ring for Rx buffers */
size = sizeof(*rxq->sw_rx_ring) * RX_RING_SIZE;
......@@ -3368,6 +3470,9 @@ static int qede_stop_queues(struct qede_dev *edev)
return rc;
}
}
if (fp->type & QEDE_FASTPATH_XDP)
bpf_prog_put(fp->rxq->xdp_prog);
}
/* Stop the vport */
......@@ -3495,6 +3600,15 @@ static int qede_start_queues(struct qede_dev *edev, bool clear_stats)
qede_update_rx_prod(edev, rxq);
}
if (fp->type & QEDE_FASTPATH_XDP) {
fp->rxq->xdp_prog = bpf_prog_add(edev->xdp_prog, 1);
if (IS_ERR(fp->rxq->xdp_prog)) {
rc = PTR_ERR(fp->rxq->xdp_prog);
fp->rxq->xdp_prog = NULL;
return rc;
}
}
if (fp->type & QEDE_FASTPATH_TX) {
rc = qede_start_txq(edev, fp, fp->txq, i, TX_PI(0));
if (rc)
......
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