| Message ID | 387f3f2efeab12a7cb2b6933e3be10704dac48bf.1612275417.git.camelia.groza@nxp.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | dpaa_eth: A050385 erratum workaround fixes under XDP | expand |
On Tue, Feb 02, 2021 at 07:34:44PM +0200, Camelia Groza wrote: > The XDP frame's headroom might be large enough to accommodate the > xdpf backpointer as well as shifting the data to an aligned address. > > Try this first before resorting to allocating a new buffer and copying > the data. > > Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> > Signed-off-by: Camelia Groza <camelia.groza@nxp.com> Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> > --- > .../net/ethernet/freescale/dpaa/dpaa_eth.c | 20 ++++++++++++++++++- > 1 file changed, 19 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c > index 78dfa05f6d55..d093b56dc30f 100644 > --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c > +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c > @@ -2180,8 +2180,9 @@ static int dpaa_a050385_wa_xdpf(struct dpaa_priv *priv, > struct xdp_frame **init_xdpf) > { > struct xdp_frame *new_xdpf, *xdpf = *init_xdpf; > - void *new_buff; > + void *new_buff, *aligned_data; > struct page *p; > + u32 data_shift; > int headroom; > > /* Check the data alignment and make sure the headroom is large > @@ -2198,6 +2199,23 @@ static int dpaa_a050385_wa_xdpf(struct dpaa_priv *priv, > return 0; > } > > + /* Try to move the data inside the buffer just enough to align it and > + * store the xdpf backpointer. If the available headroom isn't large > + * enough, resort to allocating a new buffer and copying the data. > + */ > + aligned_data = PTR_ALIGN_DOWN(xdpf->data, DPAA_FD_DATA_ALIGNMENT); > + data_shift = xdpf->data - aligned_data; > + > + /* The XDP frame's headroom needs to be large enough to accommodate > + * shifting the data as well as storing the xdpf backpointer. > + */ > + if (xdpf->headroom >= data_shift + priv->tx_headroom) { > + memmove(aligned_data, xdpf->data, xdpf->len); > + xdpf->data = aligned_data; > + xdpf->headroom = priv->tx_headroom; > + return 0; > + } > + > /* The new xdp_frame is stored in the new buffer. Reserve enough space > * in the headroom for storing it along with the driver's private > * info. The headroom needs to be aligned to DPAA_FD_DATA_ALIGNMENT to > -- > 2.17.1 >
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c index 78dfa05f6d55..d093b56dc30f 100644 --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c @@ -2180,8 +2180,9 @@ static int dpaa_a050385_wa_xdpf(struct dpaa_priv *priv, struct xdp_frame **init_xdpf) { struct xdp_frame *new_xdpf, *xdpf = *init_xdpf; - void *new_buff; + void *new_buff, *aligned_data; struct page *p; + u32 data_shift; int headroom; /* Check the data alignment and make sure the headroom is large @@ -2198,6 +2199,23 @@ static int dpaa_a050385_wa_xdpf(struct dpaa_priv *priv, return 0; } + /* Try to move the data inside the buffer just enough to align it and + * store the xdpf backpointer. If the available headroom isn't large + * enough, resort to allocating a new buffer and copying the data. + */ + aligned_data = PTR_ALIGN_DOWN(xdpf->data, DPAA_FD_DATA_ALIGNMENT); + data_shift = xdpf->data - aligned_data; + + /* The XDP frame's headroom needs to be large enough to accommodate + * shifting the data as well as storing the xdpf backpointer. + */ + if (xdpf->headroom >= data_shift + priv->tx_headroom) { + memmove(aligned_data, xdpf->data, xdpf->len); + xdpf->data = aligned_data; + xdpf->headroom = priv->tx_headroom; + return 0; + } + /* The new xdp_frame is stored in the new buffer. Reserve enough space * in the headroom for storing it along with the driver's private * info. The headroom needs to be aligned to DPAA_FD_DATA_ALIGNMENT to
The XDP frame's headroom might be large enough to accommodate the xdpf backpointer as well as shifting the data to an aligned address. Try this first before resorting to allocating a new buffer and copying the data. Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by: Camelia Groza <camelia.groza@nxp.com> --- .../net/ethernet/freescale/dpaa/dpaa_eth.c | 20 ++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-)