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Date: Sun, 20 Mar 2022 15:58:02 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com
Subject: [PATCH net-next v2 09/11] bnxt: adding bnxt_xdp_build_skb to build skb from multibuffer xdp_buff
From: Andy Gospodarek <gospo@...adcom.com>
Since we have an xdp_buff with frags there needs to be a way to
convert that into a valid sk_buff in the event that XDP_PASS is
the resulting operation. This adds a new rx_skb_func when the
netdev has an MTU that prevents the packets from sitting in a
single page.
This also make sure that GRO/LRO stay disabled even when using
the aggregation ring for large buffers.
Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 63 ++++++++++++++++---
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 39 ++++++++++++
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h | 3 +
3 files changed, 98 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 980c176d7c88..b92f5ef31132 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -971,6 +971,37 @@ static void bnxt_reuse_rx_agg_bufs(struct bnxt_cp_ring_info *cpr, u16 idx,
rxr->rx_sw_agg_prod = sw_prod;
}
+static struct sk_buff *bnxt_rx_multi_page_skb(struct bnxt *bp,
+ struct bnxt_rx_ring_info *rxr,
+ u16 cons, void *data, u8 *data_ptr,
+ dma_addr_t dma_addr,
+ unsigned int offset_and_len)
+{
+ unsigned int len = offset_and_len & 0xffff;
+ struct page *page = data;
+ u16 prod = rxr->rx_prod;
+ struct sk_buff *skb;
+ int err;
+
+ err = bnxt_alloc_rx_data(bp, rxr, prod, GFP_ATOMIC);
+ if (unlikely(err)) {
+ bnxt_reuse_rx_data(rxr, cons, data);
+ return NULL;
+ }
+ dma_addr -= bp->rx_dma_offset;
+ dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, PAGE_SIZE, bp->rx_dir,
+ DMA_ATTR_WEAK_ORDERING);
+ skb = build_skb(page_address(page), PAGE_SIZE - bp->rx_dma_offset);
+ if (!skb) {
+ __free_page(page);
+ return NULL;
+ }
+ skb_mark_for_recycle(skb);
+ skb_reserve(skb, bp->rx_dma_offset);
+ __skb_put(skb, len);
+ return skb;
+}
+
static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
struct bnxt_rx_ring_info *rxr,
u16 cons, void *data, u8 *data_ptr,
@@ -993,7 +1024,6 @@ static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
dma_addr -= bp->rx_dma_offset;
dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
- page_pool_release_page(rxr->page_pool, page);
if (unlikely(!payload))
payload = eth_get_headlen(bp->dev, data_ptr, len);
@@ -1004,6 +1034,7 @@ static struct sk_buff *bnxt_rx_page_skb(struct bnxt *bp,
return NULL;
}
+ skb_mark_for_recycle(skb);
off = (void *)data_ptr - page_address(page);
skb_add_rx_frag(skb, 0, page, off, len, PAGE_SIZE);
memcpy(skb->data - NET_IP_ALIGN, data_ptr - NET_IP_ALIGN,
@@ -1949,6 +1980,14 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
rc = -ENOMEM;
goto next_rx;
}
+ } else {
+ skb = bnxt_xdp_build_skb(bp, skb, rxr->page_pool, &xdp, rxcmp1);
+ if (!skb) {
+ /* we should be able to free the old skb here */
+ cpr->sw_stats.rx.rx_oom_discards += 1;
+ rc = -ENOMEM;
+ goto next_rx;
+ }
}
}
@@ -3965,14 +4004,21 @@ void bnxt_set_ring_params(struct bnxt *bp)
int bnxt_set_rx_skb_mode(struct bnxt *bp, bool page_mode)
{
if (page_mode) {
- if (bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU)
- return -EOPNOTSUPP;
- bp->dev->max_mtu =
- min_t(u16, bp->max_mtu, BNXT_MAX_PAGE_MODE_MTU);
bp->flags &= ~BNXT_FLAG_AGG_RINGS;
- bp->flags |= BNXT_FLAG_NO_AGG_RINGS | BNXT_FLAG_RX_PAGE_MODE;
+ bp->flags |= BNXT_FLAG_RX_PAGE_MODE;
+
+ if (bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
+ bp->flags |= BNXT_FLAG_JUMBO;
+ bp->rx_skb_func = bnxt_rx_multi_page_skb;
+ bp->dev->max_mtu =
+ min_t(u16, bp->max_mtu, BNXT_MAX_MTU);
+ } else {
+ bp->flags |= BNXT_FLAG_NO_AGG_RINGS;
+ bp->rx_skb_func = bnxt_rx_page_skb;
+ bp->dev->max_mtu =
+ min_t(u16, bp->max_mtu, BNXT_MAX_PAGE_MODE_MTU);
+ }
bp->rx_dir = DMA_BIDIRECTIONAL;
- bp->rx_skb_func = bnxt_rx_page_skb;
/* Disable LRO or GRO_HW */
netdev_update_features(bp->dev);
} else {
@@ -11116,6 +11162,9 @@ static netdev_features_t bnxt_fix_features(struct net_device *dev,
if (bp->flags & BNXT_FLAG_NO_AGG_RINGS)
features &= ~(NETIF_F_LRO | NETIF_F_GRO_HW);
+ if (!(bp->flags & BNXT_FLAG_TPA))
+ features &= ~(NETIF_F_LRO | NETIF_F_GRO_HW);
+
if (!(features & NETIF_F_GRO))
features &= ~NETIF_F_GRO_HW;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 55bd4b835ce3..21302d88e909 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
@@ -351,3 +351,42 @@ int bnxt_xdp(struct net_device *dev, struct netdev_bpf *xdp)
}
return rc;
}
+
+struct sk_buff *
+bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb, struct page_pool *pool,
+ struct xdp_buff *xdp, struct rx_cmp_ext *rxcmp1)
+{
+ struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
+ u8 num_frags, i;
+
+ if (unlikely(xdp_buff_has_frags(xdp)))
+ num_frags = sinfo->nr_frags;
+
+ if (!skb)
+ return NULL;
+
+ skb_checksum_none_assert(skb);
+ if (RX_CMP_L4_CS_OK(rxcmp1)) {
+ if (bp->dev->features & NETIF_F_RXCSUM) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ skb->csum_level = RX_CMP_ENCAP(rxcmp1);
+ }
+ }
+
+ if (unlikely(xdp_buff_has_frags(xdp))) {
+ xdp_update_skb_shared_info(skb, sinfo->nr_frags,
+ sinfo->xdp_frags_size,
+ PAGE_SIZE * sinfo->nr_frags,
+ xdp_buff_is_frag_pfmemalloc(xdp));
+ }
+ /* debug frags and number of frags */
+ for (i = 0; i < num_frags; i++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+ skb_frag_set_page(skb, i, skb_frag_page(&sinfo->frags[i]));
+ skb_frag_size_set(frag, skb_frag_size(&sinfo->frags[i]));
+ skb_frag_off_set(frag, skb_frag_off(&sinfo->frags[i]));
+ page_pool_release_page(pool, skb_frag_page(frag));
+ }
+ return skb;
+}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
index 39690bdb5526..45134d299931 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h
@@ -26,4 +26,7 @@ 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);
+struct sk_buff *bnxt_xdp_build_skb(struct bnxt *bp, struct sk_buff *skb,
+ struct page_pool *pool, struct xdp_buff *xdp,
+ struct rx_cmp_ext *rxcmp1);
#endif
--
2.18.1
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