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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?opmFNe8AQITa6zrLJ9d7V48EGmZySgpO7JJW1NJI6H/a9E68ZSZDsGJtt1dS?= =?us-ascii?Q?BGa6iEHp2+tDJc++sNZF0iOM1F+SuUOdMVKMi6sguZhMZLFz0TAZbiWNXIai?= =?us-ascii?Q?G/THSygLf/qn6n/qmeO/U+z2MtlDF0WXb2QhDgw5LcuL07tinSjafTVsW9Tf?= =?us-ascii?Q?wFt+08nfDpLXP/vLC/C31YR5lB7mKiHY0zehC4bp0+nX4vm6/2CQUh0z9PAK?= =?us-ascii?Q?uRmLl+SFBj6z8/ckwH/LJRJzqTYJpLoFPzsluHjpKOf+LZJ/PMYQix/UfmSm?= =?us-ascii?Q?4W0fDomZNQuDt5K3zMAa1nKy9bMHblOM1vM960dJH2D4P/Vx7OTy0183s9xZ?= =?us-ascii?Q?Cu/PqCHWXSF9aif/2iJgN7aIP6iTNNKYDi3Bm1FpqqG/D9/iY75HyZ0sWpPp?= =?us-ascii?Q?z2uW/VZb/KkrV+qTOtwBhH5qA5MO9GQtefsyCe+RGBPHvce8TbDEGjve1Q9s?= =?us-ascii?Q?+Wr4GrXMP+HN0sliwKEYA5DMyIS4+ln+W9tgpTOFTkJkQUQapHJCj9FuYRh5?= =?us-ascii?Q?4x2ak6SnL3hJHGYaIe45MPP1Tj0/GKJsunbMLE0epbZU0WRZkl5bUV3/SlgJ?= =?us-ascii?Q?+aLTc622hBCzQL8vT+Fr/dmfY2oqRvVZOUJc6qNAtBQC20gpJY32yjSBlA41?= =?us-ascii?Q?EjK6r384VKGBtkImvZVq3XBEw+/pErjW94/KilxMBc9vTnXiLUFnUKqoIUEF?= =?us-ascii?Q?jnZDGlBOEH0mehbGFwkiAOf8ns6oy392TRwg1+qRE9ARbpue9dAAVnET938D?= =?us-ascii?Q?N3WQ1g/vVwzbroWVo6va9Fyj23xzm3JHNz4O6tpP5ZSTQO88dkcRBODHgBlM?= =?us-ascii?Q?kGZMr6CqAT4kZ5KB0CsAIDXvdI+qdWNRBLuc60gYqxpQ43NBc3INmDp3/FEe?= =?us-ascii?Q?ek8FmbI9ve3OU2WADMScZXYzyjhwqT9MAH/fYwAdh/W+qkPV2OVUZAGH1AEx?= =?us-ascii?Q?oSEkIEy9TsTSqf7jNOKNu6oP5nG2gNg2yA/Z1M56xZDNsBohUBrB2UwQPAvJ?= =?us-ascii?Q?OrVGbWOC01oHGLRYOAS8hLtjv8nw91w6VcMVNuzKMG0R5BgRlY61YE7D0dwH?= =?us-ascii?Q?IAYLumen7xTnap+RyfnS15Mbn01naB1mOgN1BFvGlj1fMXyhfeeEgc7W95Vi?= =?us-ascii?Q?KgJP/wQzDc76xUsoGNzEdQw6rtNI2rz6lXVjI+tfcQtAw34rCqd7afk1ktN+?= =?us-ascii?Q?d+ErXh/yap3rma54ugGDeSI9N1F+H2UqnmhzlQgHjDYdYrD0Z7IGj8TAvbdo?= =?us-ascii?Q?yJaXKf/YeudfUcGBOwujNlmFSKbM8qQYYUNk7qWGOcqtLJvL3+PhrXUYc87b?= =?us-ascii?Q?IrZ7rRJ6PK2CJV0k61G5t46TqAtC4dG4Q6FZWdkvMSwHyTW2duWHiq3BvXoV?= =?us-ascii?Q?uGd9bhSMg3xGllfy3IzP7O790IXVBbQbJ2HUPPuX5U1BYzI2cWDVA3wGwSHf?= =?us-ascii?Q?udpPzu398LnwaKgWhjAs6XbVDDZATz5hShepsr7aaywztYogrhrSwDOL38QG?= =?us-ascii?Q?5uPQKOP/OmlbtDQfCv3jnKTxzPe1Ex+Inu/44wb0L0z3V4awhu7Y22EBFI3w?= =?us-ascii?Q?TS8SRO9KI6s9kUgeMbL3KXeMBfTh9TLYrgGCPKwEfbrRnBkmXaiA6fN/cXbF?= =?us-ascii?Q?zQ=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: f726009d-9e19-4b7a-408a-08dad925f700 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6117.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Dec 2022 14:10:31.0320 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0mdFdO6i9jpP0N2a7QTwJ9gMOnS1cNGqz/z0j9XMlnCnFxgFBBgnnfxpDXuhuS4Wu4QOXltyxroh7DpoPcuIq6g6lHlWCZeLegnnxvcugGg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1PR11MB4929 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Thu, Dec 08, 2022 at 06:40:41AM +0100, Gerhard Engleder wrote: > Implement ndo_xdp_xmit() for XDP TX support. Support for fragmented XDP > frames is included. > > Signed-off-by: Gerhard Engleder > --- > drivers/net/ethernet/engleder/tsnep.h | 12 +- > drivers/net/ethernet/engleder/tsnep_main.c | 204 ++++++++++++++++++++- > 2 files changed, 207 insertions(+), 9 deletions(-) > > diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h > index f72c0c4da1a9..29b04127f529 100644 > --- a/drivers/net/ethernet/engleder/tsnep.h > +++ b/drivers/net/ethernet/engleder/tsnep.h > @@ -57,6 +57,12 @@ struct tsnep_rxnfc_rule { > int location; > }; > > +enum tsnep_tx_type { > + TSNEP_TX_TYPE_SKB, > + TSNEP_TX_TYPE_XDP_TX, > + TSNEP_TX_TYPE_XDP_NDO, > +}; > + > struct tsnep_tx_entry { > struct tsnep_tx_desc *desc; > struct tsnep_tx_desc_wb *desc_wb; > @@ -65,7 +71,11 @@ struct tsnep_tx_entry { > > u32 properties; > > - struct sk_buff *skb; > + enum tsnep_tx_type type; > + union { > + struct sk_buff *skb; > + struct xdp_frame *xdpf; > + }; > size_t len; > DEFINE_DMA_UNMAP_ADDR(dma); > }; > diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c > index a28fde9fb060..b97cfd5fa1fa 100644 > --- a/drivers/net/ethernet/engleder/tsnep_main.c > +++ b/drivers/net/ethernet/engleder/tsnep_main.c > @@ -310,10 +310,11 @@ static void tsnep_tx_activate(struct tsnep_tx *tx, int index, int length, > struct tsnep_tx_entry *entry = &tx->entry[index]; > > entry->properties = 0; > - if (entry->skb) { > + if (entry->skb || entry->xdpf) { i think this change is redundant, you could keep a single check as skb and xdpf ptrs share the same memory, but i guess this makes it more obvious > entry->properties = length & TSNEP_DESC_LENGTH_MASK; > entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; > - if (skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) > + if (entry->type == TSNEP_TX_TYPE_SKB && > + skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) > entry->properties |= TSNEP_DESC_EXTENDED_WRITEBACK_FLAG; > > /* toggle user flag to prevent false acknowledge > @@ -400,6 +401,8 @@ static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count) > > entry->desc->tx = __cpu_to_le64(dma); > > + entry->type = TSNEP_TX_TYPE_SKB; > + > map_len += len; > } > > @@ -417,12 +420,13 @@ static int tsnep_tx_unmap(struct tsnep_tx *tx, int index, int count) > entry = &tx->entry[(index + i) % TSNEP_RING_SIZE]; > > if (entry->len) { > - if (i == 0) > + if (i == 0 && entry->type == TSNEP_TX_TYPE_SKB) > dma_unmap_single(dmadev, > dma_unmap_addr(entry, dma), > dma_unmap_len(entry, len), > DMA_TO_DEVICE); > - else > + else if (entry->type == TSNEP_TX_TYPE_SKB || > + entry->type == TSNEP_TX_TYPE_XDP_NDO) > dma_unmap_page(dmadev, > dma_unmap_addr(entry, dma), > dma_unmap_len(entry, len), > @@ -505,6 +509,122 @@ static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb, > return NETDEV_TX_OK; > } > > +static int tsnep_xdp_tx_map(struct xdp_frame *xdpf, struct tsnep_tx *tx, > + struct skb_shared_info *shinfo, int count, > + bool dma_map) > +{ > + struct device *dmadev = tx->adapter->dmadev; > + skb_frag_t *frag; > + unsigned int len; > + struct tsnep_tx_entry *entry; > + void *data; > + struct page *page; > + dma_addr_t dma; > + int map_len = 0; > + int i; > + > + frag = NULL; > + len = xdpf->len; > + for (i = 0; i < count; i++) { > + entry = &tx->entry[(tx->write + i) % TSNEP_RING_SIZE]; > + if (dma_map) { > + data = unlikely(frag) ? skb_frag_address(frag) : > + xdpf->data; > + dma = dma_map_single(dmadev, data, len, DMA_TO_DEVICE); > + if (dma_mapping_error(dmadev, dma)) > + return -ENOMEM; > + > + entry->type = TSNEP_TX_TYPE_XDP_NDO; > + } else { > + page = unlikely(frag) ? skb_frag_page(frag) : > + virt_to_page(xdpf->data); > + dma = page_pool_get_dma_addr(page); > + if (unlikely(frag)) > + dma += skb_frag_off(frag); > + else > + dma += sizeof(*xdpf) + xdpf->headroom; > + dma_sync_single_for_device(dmadev, dma, len, > + DMA_BIDIRECTIONAL); > + > + entry->type = TSNEP_TX_TYPE_XDP_TX; > + } > + > + entry->len = len; > + dma_unmap_addr_set(entry, dma, dma); > + > + entry->desc->tx = __cpu_to_le64(dma); > + > + map_len += len; > + > + if ((i + 1) < count) { > + frag = &shinfo->frags[i]; > + len = skb_frag_size(frag); > + } > + } > + > + return map_len; > +} > + > +/* This function requires __netif_tx_lock is held by the caller. */ > +static int tsnep_xdp_xmit_frame_ring(struct xdp_frame *xdpf, > + struct tsnep_tx *tx, bool dma_map) > +{ > + struct skb_shared_info *shinfo = xdp_get_shared_info_from_frame(xdpf); > + unsigned long flags; > + int count = 1; > + struct tsnep_tx_entry *entry; > + int length; > + int i; > + int retval; > + > + if (unlikely(xdp_frame_has_frags(xdpf))) > + count += shinfo->nr_frags; > + > + spin_lock_irqsave(&tx->lock, flags); > + > + if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1 + count)) { Wouldn't count + 1 be sufficient to check against the descs available? if there are frags then you have already accounted them under count variable so i feel like MAX_SKB_FRAGS is redundant. > + /* prevent full TX ring due to XDP */ > + spin_unlock_irqrestore(&tx->lock, flags); > + > + return -EBUSY; > + } > + > + entry = &tx->entry[tx->write]; > + entry->xdpf = xdpf; > + > + retval = tsnep_xdp_tx_map(xdpf, tx, shinfo, count, dma_map); > + if (retval < 0) { > + tsnep_tx_unmap(tx, tx->write, count); > + entry->xdpf = NULL; > + > + tx->dropped++; > + > + spin_unlock_irqrestore(&tx->lock, flags); > + > + netdev_err(tx->adapter->netdev, "XDP TX DMA map failed\n"); > + > + return retval; > + } > + length = retval; > + > + for (i = 0; i < count; i++) > + tsnep_tx_activate(tx, (tx->write + i) % TSNEP_RING_SIZE, length, > + i == (count - 1)); > + tx->write = (tx->write + count) % TSNEP_RING_SIZE; > + > + /* descriptor properties shall be valid before hardware is notified */ > + dma_wmb(); > + > + spin_unlock_irqrestore(&tx->lock, flags); > + > + return 0; > +} > + (...)