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Merge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 

Tony Nguyen says:

====================
1GbE Intel Wired LAN Driver Updates 2021-11-30

Jesper Dangaard Brouer says:

Changes to fix and enable XDP metadata to a specific Intel driver igc.
Tested with hardware i225 that uses driver igc, while testing AF_XDP
access to metadata area.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2021-12-01 14:41:02 +00:00
parent 23ea630f86 f51b5e2b59
commit b8a841a9da
1 changed files with 25 additions and 12 deletions
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37
drivers/net/ethernet/intel/igc/igc_main.c
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@ -1718,24 +1718,26 @@ static void igc_add_rx_frag(struct igc_ring *rx_ring,
static struct sk_buff *igc_build_skb(struct igc_ring *rx_ring,
struct igc_rx_buffer *rx_buffer,
union igc_adv_rx_desc *rx_desc,
unsigned int size)
struct xdp_buff *xdp)
{
void *va = page_address(rx_buffer->page) + rx_buffer->page_offset;
unsigned int size = xdp->data_end - xdp->data;
unsigned int truesize = igc_get_rx_frame_truesize(rx_ring, size);
unsigned int metasize = xdp->data - xdp->data_meta;
struct sk_buff *skb;
/* prefetch first cache line of first page */
net_prefetch(va);
net_prefetch(xdp->data_meta);
/* build an skb around the page buffer */
skb = build_skb(va - IGC_SKB_PAD, truesize);
skb = build_skb(xdp->data_hard_start, truesize);
if (unlikely(!skb))
return NULL;
/* update pointers within the skb to store the data */
skb_reserve(skb, IGC_SKB_PAD);
skb_reserve(skb, xdp->data - xdp->data_hard_start);
__skb_put(skb, size);
if (metasize)
skb_metadata_set(skb, metasize);
igc_rx_buffer_flip(rx_buffer, truesize);
return skb;
@ -1746,6 +1748,7 @@ static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
struct xdp_buff *xdp,
ktime_t timestamp)
{
unsigned int metasize = xdp->data - xdp->data_meta;
unsigned int size = xdp->data_end - xdp->data;
unsigned int truesize = igc_get_rx_frame_truesize(rx_ring, size);
void *va = xdp->data;
@ -1753,10 +1756,11 @@ static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
struct sk_buff *skb;
/* prefetch first cache line of first page */
net_prefetch(va);
net_prefetch(xdp->data_meta);
/* allocate a skb to store the frags */
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IGC_RX_HDR_LEN);
skb = napi_alloc_skb(&rx_ring->q_vector->napi,
IGC_RX_HDR_LEN + metasize);
if (unlikely(!skb))
return NULL;
@ -1769,7 +1773,13 @@ static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
headlen = eth_get_headlen(skb->dev, va, IGC_RX_HDR_LEN);
/* align pull length to size of long to optimize memcpy performance */
memcpy(__skb_put(skb, headlen), va, ALIGN(headlen, sizeof(long)));
memcpy(__skb_put(skb, headlen + metasize), xdp->data_meta,
ALIGN(headlen + metasize, sizeof(long)));
if (metasize) {
skb_metadata_set(skb, metasize);
__skb_pull(skb, metasize);
}
/* update all of the pointers */
size -= headlen;
@ -2354,7 +2364,8 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
if (!skb) {
xdp_init_buff(&xdp, truesize, &rx_ring->xdp_rxq);
xdp_prepare_buff(&xdp, pktbuf - igc_rx_offset(rx_ring),
igc_rx_offset(rx_ring) + pkt_offset, size, false);
igc_rx_offset(rx_ring) + pkt_offset,
size, true);
skb = igc_xdp_run_prog(adapter, &xdp);
}
@ -2378,7 +2389,7 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget)
} else if (skb)
igc_add_rx_frag(rx_ring, rx_buffer, skb, size);
else if (ring_uses_build_skb(rx_ring))
skb = igc_build_skb(rx_ring, rx_buffer, rx_desc, size);
skb = igc_build_skb(rx_ring, rx_buffer, &xdp);
else
skb = igc_construct_skb(rx_ring, rx_buffer, &xdp,
timestamp);
@ -2448,8 +2459,10 @@ static struct sk_buff *igc_construct_skb_zc(struct igc_ring *ring,
skb_reserve(skb, xdp->data_meta - xdp->data_hard_start);
memcpy(__skb_put(skb, totalsize), xdp->data_meta, totalsize);
if (metasize)
if (metasize) {
skb_metadata_set(skb, metasize);
__skb_pull(skb, metasize);
}
return skb;
}