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List: intel-wired-lan
Subject: [Intel-wired-lan] [PATCH v2 09/10] igc: Add support for XDP_REDIRECT action
From: Andre Guedes <andre.guedes () intel ! com>
Date: 2020-10-28 20:19:42
Message-ID: 20201028201943.93147-10-andre.guedes () intel ! com
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This patch adds support for the XDP_REDIRECT action which enables XDP
programs to redirect packets arriving at I225 NIC.
The patch also tweaks the driver's page counting scheme (as described
in '8ce29c679a6e i40e: tweak page counting for XDP_REDIRECT' and
implemented by other Intel drivers) in order to properly support
XDP_REDIRECT action.
This patch has been tested with the sample apps "xdp_redirect_cpu" and
"xdp_redirect_map" located in samples/bpf/.
Signed-off-by: Andre Guedes <andre.guedes@intel.com>
---
drivers/net/ethernet/intel/igc/igc_main.c | 11 ++++++++---
drivers/net/ethernet/intel/igc/igc_xdp.c | 6 ++++++
drivers/net/ethernet/intel/igc/igc_xdp.h | 1 +
3 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 7bcfc72b00fc..f9c7bbc1347e 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1710,8 +1710,8 @@ static bool igc_can_reuse_rx_page(struct igc_rx_buffer *rx_buffer)
* the pagecnt_bias and page count so that we fully restock the
* number of references the driver holds.
*/
- if (unlikely(!pagecnt_bias)) {
- page_ref_add(page, USHRT_MAX);
+ if (unlikely(pagecnt_bias == 1)) {
+ page_ref_add(page, USHRT_MAX - 1);
rx_buffer->pagecnt_bias = USHRT_MAX;
}
@@ -1852,7 +1852,8 @@ static bool igc_alloc_mapped_page(struct igc_ring *rx_ring,
bi->dma = dma;
bi->page = page;
bi->page_offset = igc_rx_offset(rx_ring);
- bi->pagecnt_bias = 1;
+ page_ref_add(page, USHRT_MAX - 1);
+ bi->pagecnt_bias = USHRT_MAX;
return true;
}
@@ -1952,6 +1953,9 @@ static void igc_finalize_xdp(struct igc_adapter *adapter, int status)
igc_flush_tx_descriptors(ring);
__netif_tx_unlock(nq);
}
+
+ if (status & IGC_XDP_REDIRECT)
+ xdp_do_flush();
}
static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
@@ -2020,6 +2024,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
rx_buffer->pagecnt_bias++;
break;
case IGC_XDP_TX:
+ case IGC_XDP_REDIRECT:
igc_rx_buffer_flip(rx_buffer, truesize);
xdp_status |= xdp_res;
break;
diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c
index 17852cc3a438..39b8310dfba1 100644
--- a/drivers/net/ethernet/intel/igc/igc_xdp.c
+++ b/drivers/net/ethernet/intel/igc/igc_xdp.c
@@ -151,6 +151,12 @@ struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
else
res = IGC_XDP_TX;
break;
+ case XDP_REDIRECT:
+ if (xdp_do_redirect(adapter->netdev, xdp, prog) < 0)
+ res = IGC_XDP_CONSUMED;
+ else
+ res = IGC_XDP_REDIRECT;
+ break;
default:
bpf_warn_invalid_xdp_action(act);
fallthrough;
diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.h b/drivers/net/ethernet/intel/igc/igc_xdp.h
index fdb31f40dbe5..1c38a80c3aa0 100644
--- a/drivers/net/ethernet/intel/igc/igc_xdp.h
+++ b/drivers/net/ethernet/intel/igc/igc_xdp.h
@@ -7,6 +7,7 @@
#define IGC_XDP_PASS 0
#define IGC_XDP_CONSUMED BIT(0)
#define IGC_XDP_TX BIT(1)
+#define IGC_XDP_REDIRECT BIT(2)
int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
struct netlink_ext_ack *extack);
--
2.28.0
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