[v2,05/10] ixgbe: modify driver for handling offsets
diff mbox series

Message ID 20190716030637.5634-6-kevin.laatz@intel.com
State Superseded
Delegated to: Jeff Kirsher
Headers show
Series
  • [v2,01/10] i40e: simplify Rx buffer recycle
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Commit Message

Kevin Laatz July 16, 2019, 3:06 a.m. UTC
With the addition of the unaligned chunks option, we need to make sure we
handle the offsets accordingly based on the mode we are currently running
in. This patch modifies the driver to appropriately mask the address for
each case.

Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 26 ++++++++++++++++----
 1 file changed, 21 insertions(+), 5 deletions(-)

Comments

Bowers, AndrewX July 19, 2019, 5:22 p.m. UTC | #1
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@osuosl.org] On
> Behalf Of Kevin Laatz
> Sent: Monday, July 15, 2019 8:07 PM
> To: netdev@vger.kernel.org; ast@kernel.org; daniel@iogearbox.net; Topel,
> Bjorn <bjorn.topel@intel.com>; Karlsson, Magnus
> <magnus.karlsson@intel.com>; jakub.kicinski@netronome.com;
> jonathan.lemon@gmail.com
> Cc: Richardson, Bruce <bruce.richardson@intel.com>; Loftus, Ciara
> <ciara.loftus@intel.com>; intel-wired-lan@lists.osuosl.org;
> bpf@vger.kernel.org; Laatz, Kevin <kevin.laatz@intel.com>
> Subject: [Intel-wired-lan] [PATCH v2 05/10] ixgbe: modify driver for handling
> offsets
> 
> With the addition of the unaligned chunks option, we need to make sure we
> handle the offsets accordingly based on the mode we are currently running
> in. This patch modifies the driver to appropriately mask the address for each
> case.
> 
> Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 26 ++++++++++++++++----
>  1 file changed, 21 insertions(+), 5 deletions(-)

Tested-by: Andrew Bowers <andrewx.bowers@intel.com>

Patch
diff mbox series

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index bc86057628c8..ac1669b18d13 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -143,7 +143,9 @@  static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
 			    struct ixgbe_ring *rx_ring,
 			    struct xdp_buff *xdp)
 {
+	struct xdp_umem *umem = rx_ring->xsk_umem;
 	int err, result = IXGBE_XDP_PASS;
+	u64 offset = umem->headroom;
 	struct bpf_prog *xdp_prog;
 	struct xdp_frame *xdpf;
 	u32 act;
@@ -151,7 +153,13 @@  static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
 	rcu_read_lock();
 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
-	xdp->handle += xdp->data - xdp->data_hard_start;
+	offset += xdp->data - xdp->data_hard_start;
+
+	if (umem->flags & XDP_UMEM_UNALIGNED_CHUNKS)
+		xdp->handle |= (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
+	else
+		xdp->handle += offset;
+
 	switch (act) {
 	case XDP_PASS:
 		break;
@@ -235,7 +243,10 @@  void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
 	nta++;
 	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
 
-	handle &= mask;
+	if (rx_ring->xsk_umem->flags & XDP_UMEM_UNALIGNED_CHUNKS)
+		handle &= XSK_UNALIGNED_BUF_ADDR_MASK;
+	else
+		handle &= mask;
 
 	bi->dma = xdp_umem_get_dma(rx_ring->xsk_umem, handle);
 	bi->dma += hr;
@@ -269,7 +280,7 @@  static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
 	bi->addr = xdp_umem_get_data(umem, handle);
 	bi->addr += hr;
 
-	bi->handle = handle + umem->headroom;
+	bi->handle = handle;
 
 	xsk_umem_discard_addr(umem);
 	return true;
@@ -296,7 +307,7 @@  static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
 	bi->addr = xdp_umem_get_data(umem, handle);
 	bi->addr += hr;
 
-	bi->handle = handle + umem->headroom;
+	bi->handle = handle;
 
 	xsk_umem_discard_addr_rq(umem);
 	return true;
@@ -565,6 +576,7 @@  static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
 	struct ixgbe_tx_buffer *tx_bi;
 	bool work_done = true;
 	struct xdp_desc desc;
+	u64 addr, offset;
 	dma_addr_t dma;
 	u32 cmd_type;
 
@@ -578,7 +590,11 @@  static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
 		if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &desc))
 			break;
 
-		dma = xdp_umem_get_dma(xdp_ring->xsk_umem, desc.addr);
+		/* for unaligned chunks need to take offset from upper bits */
+		offset = (desc.addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT);
+		addr = (desc.addr & XSK_UNALIGNED_BUF_ADDR_MASK);
+
+		dma = xdp_umem_get_dma(xdp_ring->xsk_umem, addr + offset);
 
 		dma_sync_single_for_device(xdp_ring->dev, dma, desc.len,
 					   DMA_BIDIRECTIONAL);