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Date: Fri, 26 Aug 2016 19:06:12 +0100
From: Jakub Kicinski <jakub.kicinski@...ronome.com>
To: netdev@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net,
dinan.gunawardena@...ronome.com, jiri@...nulli.us,
john.fastabend@...il.com, kubakici@...pl,
Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [RFCv2 13/16] nfp: bpf: add packet marking support
Add missing ABI defines and eBPF instructions to allow
mark to be passed on and extend prepend parsing on the
RX path to pick it up from packet metadata.
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
drivers/net/ethernet/netronome/nfp/nfp_bpf.h | 2 ++
drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c | 19 +++++++++++
.../net/ethernet/netronome/nfp/nfp_net_common.c | 38 ++++++++++++++++++----
drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h | 8 +++++
4 files changed, 60 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
index f4265f88db23..85b258a70b18 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
@@ -91,6 +91,8 @@ enum nfp_bpf_reg_type {
#define imm_both(np) reg_both((np)->regs_per_thread - STATIC_REG_IMM)
#define NFP_BPF_ABI_FLAGS reg_nnr(0)
+#define NFP_BPF_ABI_FLAG_MARK 1
+#define NFP_BPF_ABI_MARK reg_nnr(1)
#define NFP_BPF_ABI_PKT reg_nnr(2)
#define NFP_BPF_ABI_LEN reg_nnr(3)
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
index 09ed1627ae20..ca73be6fcc3d 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
@@ -674,6 +674,16 @@ static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size)
return construct_data_ind_ld(nfp_prog, offset, 0, false, size);
}
+static int wrp_set_mark(struct nfp_prog *nfp_prog, u8 src)
+{
+ emit_alu(nfp_prog, NFP_BPF_ABI_MARK,
+ reg_none(), ALU_OP_NONE, reg_b(src));
+ emit_alu(nfp_prog, NFP_BPF_ABI_FLAGS,
+ NFP_BPF_ABI_FLAGS, ALU_OP_OR, reg_imm(NFP_BPF_ABI_FLAG_MARK));
+
+ return 0;
+}
+
static void
wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm)
{
@@ -1117,6 +1127,14 @@ static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
return 0;
}
+static int mem_stx4(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);
+
+ return -ENOTSUPP;
+}
+
static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
if (meta->insn.off < 0) /* TODO */
@@ -1306,6 +1324,7 @@ static const instr_cb_t instr_cb[256] = {
[BPF_LD | BPF_IND | BPF_H] = data_ind_ld2,
[BPF_LD | BPF_IND | BPF_W] = data_ind_ld4,
[BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4,
+ [BPF_STX | BPF_MEM | BPF_W] = mem_stx4,
[BPF_JMP | BPF_JA | BPF_K] = jump,
[BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm,
[BPF_JMP | BPF_JGT | BPF_K] = jgt_imm,
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 053bda8a0fbd..739dd13dc18e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1298,23 +1298,20 @@ static void nfp_net_rx_csum(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
* nfp_net_set_hash() - Set SKB hash data
* @netdev: adapter's net_device structure
* @skb: SKB to set the hash data on
- * @rxd: RX descriptor
*
* The RSS hash and hash-type are pre-pended to the packet data.
* Extract and decode it and set the skb fields.
*/
-static void nfp_net_set_hash(struct net_device *netdev, struct sk_buff *skb,
- struct nfp_net_rx_desc *rxd)
+static void nfp_net_set_hash(struct net_device *netdev, struct sk_buff *skb)
{
struct nfp_net_rx_hash *rx_hash;
- if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS) ||
- !(netdev->features & NETIF_F_RXHASH))
+ if (!(netdev->features & NETIF_F_RXHASH))
return;
rx_hash = (struct nfp_net_rx_hash *)(skb->data - sizeof(*rx_hash));
- switch (be32_to_cpu(rx_hash->hash_type)) {
+ switch (be32_to_cpu(rx_hash->hash_type) & NPF_NET_META_FIELD_HASH) {
case NFP_NET_RSS_IPV4:
case NFP_NET_RSS_IPV6:
case NFP_NET_RSS_IPV6_EX:
@@ -1326,6 +1323,33 @@ static void nfp_net_set_hash(struct net_device *netdev, struct sk_buff *skb,
}
}
+static void
+nfp_net_parse_meta(struct net_device *netdev, struct sk_buff *skb,
+ struct nfp_net_rx_desc *rxd, int meta_len)
+{
+ u32 meta_info;
+ u8 *data = skb->data - 4;
+
+ if (rxd->rxd.flags & PCIE_DESC_RX_RSS) {
+ data -= 4;
+ nfp_net_set_hash(netdev, skb);
+ }
+
+ meta_info = get_unaligned_be32(data) >> 8;
+ data -= 4;
+
+ while (meta_info) {
+ switch (meta_info & GENMASK(NFP_NET_META_FIELD_SIZE, 0)) {
+ case NFP_NET_META_MARK:
+ skb->mark = get_unaligned_be32(data);
+ data -= 4;
+ break;
+ }
+
+ meta_info >>= NFP_NET_META_FIELD_SIZE;
+ }
+}
+
/**
* nfp_net_rx() - receive up to @budget packets on @rx_ring
* @rx_ring: RX ring to receive from
@@ -1440,7 +1464,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
skb_reserve(skb, nn->rx_offset);
skb_put(skb, data_len - meta_len);
- nfp_net_set_hash(nn->netdev, skb, rxd);
+ nfp_net_parse_meta(nn->netdev, skb, rxd, meta_len);
/* Pad small frames to minimum */
if (skb_put_padto(skb, 60))
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h b/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
index a4b0ef11a09c..4c30439d3fcb 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
@@ -80,6 +80,14 @@
#define NFP_NET_RSS_IPV6_EX_UDP 9
/**
+ * Prepend field types
+ */
+#define NPF_NET_META_FIELD_HASH 0xff
+
+#define NFP_NET_META_FIELD_SIZE 4
+#define NFP_NET_META_MARK 1
+
+/**
* @NFP_NET_TXR_MAX: Maximum number of TX rings
* @NFP_NET_RXR_MAX: Maximum number of RX rings
*/
--
1.9.1
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