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nfp: add support for offload of XDP programs 

Most infrastructure can be reused, provide separate handling
of context offsets and exit codes.

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 17:12:09 +00:00 committed by David S. Miller
parent 2e9d594d50
commit 6d6770755f
6 changed files with 139 additions and 6 deletions
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1
drivers/net/ethernet/netronome/nfp/nfp_bpf.h
View File

@ -62,6 +62,7 @@ enum nfp_bpf_action_type {
NN_ACT_TC_DROP,
NN_ACT_TC_REDIR,
NN_ACT_DIRECT,
NN_ACT_XDP,
};
/* Software register representation, hardware encoding in asm.h */

92
drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
View File

@ -1126,7 +1126,7 @@ static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
meta->insn.src_reg * 2, true, 4);
}
static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
static int mem_ldx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
if (meta->insn.off == offsetof(struct sk_buff, len))
emit_alu(nfp_prog, reg_both(meta->insn.dst_reg * 2),
@ -1134,12 +1134,42 @@ static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
else
return -ENOTSUPP;
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
return 0;
}
static int mem_ldx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
u32 dst = reg_both(meta->insn.dst_reg * 2);
if (meta->insn.off != offsetof(struct xdp_md, data) &&
meta->insn.off != offsetof(struct xdp_md, data_end))
return -ENOTSUPP;
emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, NFP_BPF_ABI_PKT);
if (meta->insn.off == offsetof(struct xdp_md, data))
return 0;
emit_alu(nfp_prog, dst, dst, ALU_OP_ADD, NFP_BPF_ABI_LEN);
return 0;
}
static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
int ret;
if (nfp_prog->act == NN_ACT_XDP)
ret = mem_ldx4_xdp(nfp_prog, meta);
else
ret = mem_ldx4_skb(nfp_prog, meta);
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
return ret;
}
static int mem_stx4_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
if (meta->insn.off == offsetof(struct sk_buff, mark))
return wrp_set_mark(nfp_prog, meta->insn.src_reg * 2);
@ -1147,6 +1177,18 @@ static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
return -ENOTSUPP;
}
static int mem_stx4_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return -ENOTSUPP;
}
static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
if (nfp_prog->act == NN_ACT_XDP)
return mem_stx4_xdp(nfp_prog, meta);
return mem_stx4_skb(nfp_prog, meta);
}
static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
if (meta->insn.off < 0) /* TODO */
@ -1530,6 +1572,47 @@ static void nfp_outro_tc_da(struct nfp_prog *nfp_prog)
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
}
static void nfp_outro_xdp(struct nfp_prog *nfp_prog)
{
/* XDP return codes:
* 0 aborted 0x82 -> drop, count as stat3
* 1 drop 0x22 -> drop, count as stat1
* 2 pass 0x11 -> pass, count as stat0
* 3 tx 0x44 -> redir, count as stat2
* * unknown 0x82 -> drop, count as stat3
*/
/* Target for aborts */
nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
emit_alu(nfp_prog, reg_a(0),
reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16);
/* Target for normal exits */
nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
/* if R0 > 3 jump to abort */
emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0));
emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
wrp_immed(nfp_prog, reg_b(2), 0x44112282);
emit_shf(nfp_prog, reg_a(1),
reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3);
emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
emit_shf(nfp_prog, reg_b(2),
reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
emit_alu(nfp_prog, reg_a(0),
reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
}
static void nfp_outro(struct nfp_prog *nfp_prog)
{
switch (nfp_prog->act) {
@ -1540,6 +1623,9 @@ static void nfp_outro(struct nfp_prog *nfp_prog)
case NN_ACT_TC_REDIR:
nfp_outro_tc_legacy(nfp_prog);
break;
case NN_ACT_XDP:
nfp_outro_xdp(nfp_prog);
break;
}
}

3
drivers/net/ethernet/netronome/nfp/nfp_bpf_verifier.c
View File

@ -80,6 +80,9 @@ nfp_bpf_check_exit(struct nfp_prog *nfp_prog,
{
const struct bpf_reg_state *reg0 = &env->cur_state.regs[0];
if (nfp_prog->act == NN_ACT_XDP)
return 0;
if (reg0->type != CONST_IMM) {
pr_info("unsupported exit state: %d, imm: %llx\n",
reg0->type, reg0->imm);

2
drivers/net/ethernet/netronome/nfp/nfp_net.h
View File

@ -435,6 +435,7 @@ struct nfp_stat_pair {
* @is_vf: Is the driver attached to a VF?
* @fw_loaded: Is the firmware loaded?
* @bpf_offload_skip_sw: Offloaded BPF program will not be rerun by cls_bpf
* @bpf_offload_xdp: Offloaded BPF program is XDP
* @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
@ -502,6 +503,7 @@ struct nfp_net {
unsigned is_vf:1;
unsigned fw_loaded:1;
unsigned bpf_offload_skip_sw:1;
unsigned bpf_offload_xdp:1;
u32 ctrl;
u32 fl_bufsz;

44
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -1600,7 +1600,8 @@ 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);
if (xdp_prog) {
if (xdp_prog && !(rxd->rxd.flags & PCIE_DESC_RX_BPF &&
nn->bpf_offload_xdp)) {
int act;
dma_sync_single_for_cpu(&nn->pdev->dev,
@ -2693,8 +2694,12 @@ nfp_net_setup_tc(struct net_device *netdev, u32 handle, __be16 proto,
if (proto != htons(ETH_P_ALL))
return -ENOTSUPP;
if (tc->type == TC_SETUP_CLSBPF && nfp_net_ebpf_capable(nn))
return nfp_net_bpf_offload(nn, tc->cls_bpf);
if (tc->type == TC_SETUP_CLSBPF && nfp_net_ebpf_capable(nn)) {
if (!nn->bpf_offload_xdp)
return nfp_net_bpf_offload(nn, tc->cls_bpf);
else
return -EBUSY;
}
return -EINVAL;
}
@ -2902,6 +2907,34 @@ static void nfp_net_del_vxlan_port(struct net_device *netdev,
nfp_net_set_vxlan_port(nn, idx, 0);
}
static int nfp_net_xdp_offload(struct nfp_net *nn, struct bpf_prog *prog)
{
struct tc_cls_bpf_offload cmd = {
.prog = prog,
};
int ret;
if (!nfp_net_ebpf_capable(nn))
return -EINVAL;
if (nn->ctrl & NFP_NET_CFG_CTRL_BPF) {
if (!nn->bpf_offload_xdp)
return prog ? -EBUSY : 0;
cmd.command = prog ? TC_CLSBPF_REPLACE : TC_CLSBPF_DESTROY;
} else {
if (!prog)
return 0;
cmd.command = TC_CLSBPF_ADD;
}
ret = nfp_net_bpf_offload(nn, &cmd);
/* Stop offload if replace not possible */
if (ret && cmd.command == TC_CLSBPF_REPLACE)
nfp_net_xdp_offload(nn, NULL);
nn->bpf_offload_xdp = prog && !ret;
return ret;
}
static int nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog)
{
struct nfp_net_ring_set rx = {
@ -2920,6 +2953,7 @@ static int nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog)
if (prog && nn->xdp_prog) {
prog = xchg(&nn->xdp_prog, prog);
bpf_prog_put(prog);
nfp_net_xdp_offload(nn, nn->xdp_prog);
return 0;
}
@ -2934,6 +2968,8 @@ static int nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog)
if (prog)
bpf_prog_put(prog);
nfp_net_xdp_offload(nn, nn->xdp_prog);
return 0;
}
@ -3233,5 +3269,7 @@ void nfp_net_netdev_clean(struct net_device *netdev)
if (nn->xdp_prog)
bpf_prog_put(nn->xdp_prog);
if (nn->bpf_offload_xdp)
nfp_net_xdp_offload(nn, NULL);
unregister_netdev(nn->netdev);
}

3
drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
View File

@ -111,6 +111,9 @@ nfp_net_bpf_get_act(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf)
const struct tc_action *a;
LIST_HEAD(actions);
if (!cls_bpf->exts)
return NN_ACT_XDP;
/* TC direct action */
if (cls_bpf->exts_integrated) {
if (tc_no_actions(cls_bpf->exts))