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Message-Id: <1649213633-7662-2-git-send-email-michael.chan@broadcom.com>
Date: Tue, 5 Apr 2022 22:53:43 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com,
bpf@...r.kernel.org, john.fastabend@...il.com, toke@...hat.com,
lorenzo@...nel.org, ast@...nel.org, daniel@...earbox.net,
echaudro@...hat.com, pabeni@...hat.com
Subject: [PATCH net-next v3 01/11] bnxt: refactor bnxt_rx_xdp to separate xdp_init_buff/xdp_prepare_buff
From: Andy Gospodarek <gospo@...adcom.com>
Move initialization of xdp_buff outside of bnxt_rx_xdp to prepare
for allowing bnxt_rx_xdp to operate on multibuffer xdp_buffs.
v2: Fix uninitalized variables warning in bnxt_xdp.c.
v3: Add new define BNXT_PAGE_MODE_BUF_SIZE
Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 11 +++--
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 8 ++--
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 46 ++++++++++++++-----
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h | 7 ++-
4 files changed, 53 insertions(+), 19 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 874fad0a5cf8..826d94c49d26 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1731,6 +1731,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
u8 *data_ptr, agg_bufs, cmp_type;
dma_addr_t dma_addr;
struct sk_buff *skb;
+ struct xdp_buff xdp;
u32 flags, misc;
void *data;
int rc = 0;
@@ -1839,11 +1840,13 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
len = flags >> RX_CMP_LEN_SHIFT;
dma_addr = rx_buf->mapping;
- if (bnxt_rx_xdp(bp, rxr, cons, data, &data_ptr, &len, event)) {
- rc = 1;
- goto next_rx;
+ if (bnxt_xdp_attached(bp, rxr)) {
+ bnxt_xdp_buff_init(bp, rxr, cons, &data_ptr, &len, &xdp);
+ if (bnxt_rx_xdp(bp, rxr, cons, xdp, data, &len, event)) {
+ rc = 1;
+ goto next_rx;
+ }
}
-
if (len <= bp->rx_copy_thresh) {
skb = bnxt_copy_skb(bnapi, data_ptr, len, dma_addr);
bnxt_reuse_rx_data(rxr, cons, data);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 98453a78cbd0..0f35459d5206 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -591,10 +591,12 @@ struct nqe_cn {
#define BNXT_RX_PAGE_SIZE (1 << BNXT_RX_PAGE_SHIFT)
#define BNXT_MAX_MTU 9500
-#define BNXT_MAX_PAGE_MODE_MTU \
+#define BNXT_PAGE_MODE_BUF_SIZE \
((unsigned int)PAGE_SIZE - VLAN_ETH_HLEN - NET_IP_ALIGN - \
- XDP_PACKET_HEADROOM - \
- SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info)))
+ XDP_PACKET_HEADROOM)
+#define BNXT_MAX_PAGE_MODE_MTU \
+ BNXT_PAGE_MODE_BUF_SIZE - \
+ SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info))
#define BNXT_MIN_PKT_SIZE 52
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 03b1d6c04504..a3924e6030fe 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
@@ -106,18 +106,44 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
}
}
+bool bnxt_xdp_attached(struct bnxt *bp, struct bnxt_rx_ring_info *rxr)
+{
+ struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
+
+ return !!xdp_prog;
+}
+
+void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
+ u16 cons, u8 **data_ptr, unsigned int *len,
+ struct xdp_buff *xdp)
+{
+ struct bnxt_sw_rx_bd *rx_buf;
+ struct pci_dev *pdev;
+ dma_addr_t mapping;
+ u32 offset;
+
+ pdev = bp->pdev;
+ rx_buf = &rxr->rx_buf_ring[cons];
+ offset = bp->rx_offset;
+
+ mapping = rx_buf->mapping - bp->rx_dma_offset;
+ dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
+
+ xdp_init_buff(xdp, BNXT_PAGE_MODE_BUF_SIZE + offset, &rxr->xdp_rxq);
+ xdp_prepare_buff(xdp, *data_ptr - offset, offset, *len, false);
+}
+
/* returns the following:
* true - packet consumed by XDP and new buffer is allocated.
* false - packet should be passed to the stack.
*/
bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
- struct page *page, u8 **data_ptr, unsigned int *len, u8 *event)
+ struct xdp_buff xdp, struct page *page, unsigned int *len, u8 *event)
{
struct bpf_prog *xdp_prog = READ_ONCE(rxr->xdp_prog);
struct bnxt_tx_ring_info *txr;
struct bnxt_sw_rx_bd *rx_buf;
struct pci_dev *pdev;
- struct xdp_buff xdp;
dma_addr_t mapping;
void *orig_data;
u32 tx_avail;
@@ -128,16 +154,10 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
return false;
pdev = bp->pdev;
- rx_buf = &rxr->rx_buf_ring[cons];
offset = bp->rx_offset;
- mapping = rx_buf->mapping - bp->rx_dma_offset;
- dma_sync_single_for_cpu(&pdev->dev, mapping + offset, *len, bp->rx_dir);
-
txr = rxr->bnapi->tx_ring;
/* BNXT_RX_PAGE_MODE(bp) when XDP enabled */
- xdp_init_buff(&xdp, PAGE_SIZE, &rxr->xdp_rxq);
- xdp_prepare_buff(&xdp, *data_ptr - offset, offset, *len, false);
orig_data = xdp.data;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
@@ -150,15 +170,17 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
*event &= ~BNXT_RX_EVENT;
*len = xdp.data_end - xdp.data;
- if (orig_data != xdp.data) {
+ if (orig_data != xdp.data)
offset = xdp.data - xdp.data_hard_start;
- *data_ptr = xdp.data_hard_start + offset;
- }
+
switch (act) {
case XDP_PASS:
return false;
case XDP_TX:
+ rx_buf = &rxr->rx_buf_ring[cons];
+ mapping = rx_buf->mapping - bp->rx_dma_offset;
+
if (tx_avail < 1) {
trace_xdp_exception(bp->dev, xdp_prog, act);
bnxt_reuse_rx_data(rxr, cons, page);
@@ -177,6 +199,8 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
* redirect is coming from a frame received by the
* bnxt_en driver.
*/
+ rx_buf = &rxr->rx_buf_ring[cons];
+ mapping = rx_buf->mapping - bp->rx_dma_offset;
dma_unmap_page_attrs(&pdev->dev, mapping,
PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
index 067bb5e821f5..97e7905dbb20 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
@@ -17,10 +17,15 @@ struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
dma_addr_t mapping, u32 len);
void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts);
bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
- struct page *page, u8 **data_ptr, unsigned int *len,
+ struct xdp_buff xdp, struct page *page, unsigned int *len,
u8 *event);
int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp);
int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
struct xdp_frame **frames, u32 flags);
+bool bnxt_xdp_attached(struct bnxt *bp, struct bnxt_rx_ring_info *rxr);
+
+void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
+ u16 cons, u8 **data_ptr, unsigned int *len,
+ struct xdp_buff *xdp);
#endif
--
2.18.1
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