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Message-Id: <1649213633-7662-11-git-send-email-michael.chan@broadcom.com>
Date: Tue, 5 Apr 2022 22:53:52 -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 10/11] bnxt: support transmit and free of aggregation buffers
From: Andy Gospodarek <gospo@...adcom.com>
This patch adds the following features:
- Support for XDP_TX and XDP_DROP action when using xdp_buff
with frags
- Support for freeing all frags attached to an xdp_buff
- Cleanup of TX ring buffers after transmits complete
- Slight change in definition of bnxt_sw_tx_bd since nr_frags
and RX producer may both need to be used
- Clear out skb_shared_info at the end of the buffer
v2: Fix uninitialized variable warning in bnxt_xdp_buff_frags_free().
Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 18 ++-
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 7 +-
.../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 2 +-
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 117 ++++++++++++++++--
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h | 5 +-
5 files changed, 126 insertions(+), 23 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index f96f41c7927e..25d74c9030fd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1951,9 +1951,13 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
skb = bnxt_copy_skb(bnapi, data_ptr, len, dma_addr);
bnxt_reuse_rx_data(rxr, cons, data);
if (!skb) {
- if (agg_bufs)
- bnxt_reuse_rx_agg_bufs(cpr, cp_cons, 0,
- agg_bufs, false);
+ if (agg_bufs) {
+ if (!xdp_active)
+ bnxt_reuse_rx_agg_bufs(cpr, cp_cons, 0,
+ agg_bufs, false);
+ else
+ bnxt_xdp_buff_frags_free(rxr, &xdp);
+ }
cpr->sw_stats.rx.rx_oom_discards += 1;
rc = -ENOMEM;
goto next_rx;
@@ -1986,6 +1990,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
skb = bnxt_xdp_build_skb(bp, skb, agg_bufs, rxr->page_pool, &xdp, rxcmp1);
if (!skb) {
/* we should be able to free the old skb here */
+ bnxt_xdp_buff_frags_free(rxr, &xdp);
cpr->sw_stats.rx.rx_oom_discards += 1;
rc = -ENOMEM;
goto next_rx;
@@ -2605,10 +2610,13 @@ static void __bnxt_poll_work_done(struct bnxt *bp, struct bnxt_napi *bnapi)
if ((bnapi->events & BNXT_RX_EVENT) && !(bnapi->in_reset)) {
struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
- if (bnapi->events & BNXT_AGG_EVENT)
- bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
bnxt_db_write(bp, &rxr->rx_db, rxr->rx_prod);
}
+ if (bnapi->events & BNXT_AGG_EVENT) {
+ struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
+
+ bnxt_db_write(bp, &rxr->rx_agg_db, rxr->rx_agg_prod);
+ }
bnapi->events = 0;
}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 319d6851eecc..a498ee297946 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -701,13 +701,12 @@ struct bnxt_sw_tx_bd {
};
DEFINE_DMA_UNMAP_ADDR(mapping);
DEFINE_DMA_UNMAP_LEN(len);
+ struct page *page;
u8 is_gso;
u8 is_push;
u8 action;
- union {
- unsigned short nr_frags;
- u16 rx_prod;
- };
+ unsigned short nr_frags;
+ u16 rx_prod;
};
struct bnxt_sw_rx_bd {
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 22e965e18fbc..b3a48d6675fe 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -3491,7 +3491,7 @@ static int bnxt_run_loopback(struct bnxt *bp)
dev_kfree_skb(skb);
return -EIO;
}
- bnxt_xmit_bd(bp, txr, map, pkt_size);
+ bnxt_xmit_bd(bp, txr, map, pkt_size, NULL);
/* Sync BD data before updating doorbell */
wmb();
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 5183357ca11c..c2905f0a8c6c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
@@ -24,36 +24,91 @@ DEFINE_STATIC_KEY_FALSE(bnxt_xdp_locking_key);
struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
struct bnxt_tx_ring_info *txr,
- dma_addr_t mapping, u32 len)
+ dma_addr_t mapping, u32 len,
+ struct xdp_buff *xdp)
{
- struct bnxt_sw_tx_bd *tx_buf;
+ struct skb_shared_info *sinfo;
+ struct bnxt_sw_tx_bd *tx_buf, *first_buf;
struct tx_bd *txbd;
+ int num_frags = 0;
u32 flags;
u16 prod;
+ int i;
+
+ if (xdp && xdp_buff_has_frags(xdp)) {
+ sinfo = xdp_get_shared_info_from_buff(xdp);
+ num_frags = sinfo->nr_frags;
+ }
+ /* fill up the first buffer */
prod = txr->tx_prod;
tx_buf = &txr->tx_buf_ring[prod];
+ first_buf = tx_buf;
+ tx_buf->nr_frags = num_frags;
+ if (xdp)
+ tx_buf->page = virt_to_head_page(xdp->data);
txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
- flags = (len << TX_BD_LEN_SHIFT) | (1 << TX_BD_FLAGS_BD_CNT_SHIFT) |
- TX_BD_FLAGS_PACKET_END | bnxt_lhint_arr[len >> 9];
+ flags = ((len) << TX_BD_LEN_SHIFT) | ((num_frags + 1) << TX_BD_FLAGS_BD_CNT_SHIFT);
txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
txbd->tx_bd_opaque = prod;
txbd->tx_bd_haddr = cpu_to_le64(mapping);
+ /* now let us fill up the frags into the next buffers */
+ for (i = 0; i < num_frags ; i++) {
+ skb_frag_t *frag = &sinfo->frags[i];
+ struct bnxt_sw_tx_bd *frag_tx_buf;
+ struct pci_dev *pdev = bp->pdev;
+ dma_addr_t frag_mapping;
+ int frag_len;
+
+ prod = NEXT_TX(prod);
+ txr->tx_prod = prod;
+
+ /* first fill up the first buffer */
+ frag_tx_buf = &txr->tx_buf_ring[prod];
+ frag_tx_buf->page = skb_frag_page(frag);
+
+ txbd = &txr->tx_desc_ring[TX_RING(prod)][TX_IDX(prod)];
+
+ frag_len = skb_frag_size(frag);
+ frag_mapping = skb_frag_dma_map(&pdev->dev, frag, 0,
+ frag_len, DMA_TO_DEVICE);
+
+ if (unlikely(dma_mapping_error(&pdev->dev, frag_mapping)))
+ return NULL;
+
+ dma_unmap_addr_set(frag_tx_buf, mapping, frag_mapping);
+
+ flags = frag_len << TX_BD_LEN_SHIFT;
+ txbd->tx_bd_len_flags_type = cpu_to_le32(flags);
+ txbd->tx_bd_opaque = prod;
+ txbd->tx_bd_haddr = cpu_to_le64(frag_mapping);
+
+ len = frag_len;
+ }
+
+ flags &= ~TX_BD_LEN;
+ txbd->tx_bd_len_flags_type = cpu_to_le32(((len) << TX_BD_LEN_SHIFT) | flags |
+ TX_BD_FLAGS_PACKET_END);
+ /* Sync TX BD */
+ wmb();
prod = NEXT_TX(prod);
txr->tx_prod = prod;
- return tx_buf;
+
+ return first_buf;
}
static void __bnxt_xmit_xdp(struct bnxt *bp, struct bnxt_tx_ring_info *txr,
- dma_addr_t mapping, u32 len, u16 rx_prod)
+ dma_addr_t mapping, u32 len, u16 rx_prod,
+ struct xdp_buff *xdp)
{
struct bnxt_sw_tx_bd *tx_buf;
- tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
+ tx_buf = bnxt_xmit_bd(bp, txr, mapping, len, xdp);
tx_buf->rx_prod = rx_prod;
tx_buf->action = XDP_TX;
+
}
static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
@@ -63,7 +118,7 @@ static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
{
struct bnxt_sw_tx_bd *tx_buf;
- tx_buf = bnxt_xmit_bd(bp, txr, mapping, len);
+ tx_buf = bnxt_xmit_bd(bp, txr, mapping, len, NULL);
tx_buf->action = XDP_REDIRECT;
tx_buf->xdpf = xdpf;
dma_unmap_addr_set(tx_buf, mapping, mapping);
@@ -78,7 +133,7 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
struct bnxt_sw_tx_bd *tx_buf;
u16 tx_cons = txr->tx_cons;
u16 last_tx_cons = tx_cons;
- int i;
+ int i, j, frags;
for (i = 0; i < nr_pkts; i++) {
tx_buf = &txr->tx_buf_ring[tx_cons];
@@ -96,6 +151,13 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
} else if (tx_buf->action == XDP_TX) {
rx_doorbell_needed = true;
last_tx_cons = tx_cons;
+
+ frags = tx_buf->nr_frags;
+ for (j = 0; j < frags; j++) {
+ tx_cons = NEXT_TX(tx_cons);
+ tx_buf = &txr->tx_buf_ring[tx_cons];
+ page_pool_recycle_direct(rxr->page_pool, tx_buf->page);
+ }
}
tx_cons = NEXT_TX(tx_cons);
}
@@ -103,6 +165,7 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
if (rx_doorbell_needed) {
tx_buf = &txr->tx_buf_ring[last_tx_cons];
bnxt_db_write(bp, &rxr->rx_db, tx_buf->rx_prod);
+
}
}
@@ -133,6 +196,23 @@ void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
xdp_prepare_buff(xdp, *data_ptr - offset, offset, *len, false);
}
+void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr,
+ struct xdp_buff *xdp)
+{
+ struct skb_shared_info *shinfo;
+ int i;
+
+ if (!xdp || !xdp_buff_has_frags(xdp))
+ return;
+ shinfo = xdp_get_shared_info_from_buff(xdp);
+ for (i = 0; i < shinfo->nr_frags; i++) {
+ struct page *page = skb_frag_page(&shinfo->frags[i]);
+
+ page_pool_recycle_direct(rxr->page_pool, page);
+ }
+ shinfo->nr_frags = 0;
+}
+
/* returns the following:
* true - packet consumed by XDP and new buffer is allocated.
* false - packet should be passed to the stack.
@@ -145,6 +225,7 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
struct bnxt_sw_rx_bd *rx_buf;
struct pci_dev *pdev;
dma_addr_t mapping;
+ u32 tx_needed = 1;
void *orig_data;
u32 tx_avail;
u32 offset;
@@ -180,18 +261,28 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
case XDP_TX:
rx_buf = &rxr->rx_buf_ring[cons];
mapping = rx_buf->mapping - bp->rx_dma_offset;
+ *event = 0;
+
+ if (unlikely(xdp_buff_has_frags(&xdp))) {
+ struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(&xdp);
- if (tx_avail < 1) {
+ tx_needed += sinfo->nr_frags;
+ *event = BNXT_AGG_EVENT;
+ }
+
+ if (tx_avail < tx_needed) {
trace_xdp_exception(bp->dev, xdp_prog, act);
+ bnxt_xdp_buff_frags_free(rxr, &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
return true;
}
- *event = BNXT_TX_EVENT;
dma_sync_single_for_device(&pdev->dev, mapping + offset, *len,
bp->rx_dir);
+
+ *event |= BNXT_TX_EVENT;
__bnxt_xmit_xdp(bp, txr, mapping + offset, *len,
- NEXT_RX(rxr->rx_prod));
+ NEXT_RX(rxr->rx_prod), &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
return true;
case XDP_REDIRECT:
@@ -208,6 +299,7 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
/* if we are unable to allocate a new buffer, abort and reuse */
if (bnxt_alloc_rx_data(bp, rxr, rxr->rx_prod, GFP_ATOMIC)) {
trace_xdp_exception(bp->dev, xdp_prog, act);
+ bnxt_xdp_buff_frags_free(rxr, &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
return true;
}
@@ -227,6 +319,7 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
trace_xdp_exception(bp->dev, xdp_prog, act);
fallthrough;
case XDP_DROP:
+ bnxt_xdp_buff_frags_free(rxr, &xdp);
bnxt_reuse_rx_data(rxr, cons, page);
break;
}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
index 27290f649be3..505911ae095d 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
@@ -14,7 +14,8 @@ DECLARE_STATIC_KEY_FALSE(bnxt_xdp_locking_key);
struct bnxt_sw_tx_bd *bnxt_xmit_bd(struct bnxt *bp,
struct bnxt_tx_ring_info *txr,
- dma_addr_t mapping, u32 len);
+ dma_addr_t mapping, u32 len,
+ struct xdp_buff *xdp);
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 xdp_buff xdp, struct page *page, unsigned int *len,
@@ -28,6 +29,8 @@ 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);
+void bnxt_xdp_buff_frags_free(struct bnxt_rx_ring_info *rxr,
+ struct xdp_buff *xdp);
struct sk_buff *bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb,
u8 num_frags, struct page_pool *pool,
struct xdp_buff *xdp,
--
2.18.1
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