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Message-Id: <27adb990b7e47e7b4f6fb1b590a37042f874f24d.1616179034.git.lorenzo@kernel.org>
Date: Fri, 19 Mar 2021 22:47:19 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: bpf@...r.kernel.org, netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
ast@...nel.org, daniel@...earbox.net, shayagr@...zon.com,
john.fastabend@...il.com, dsahern@...nel.org, brouer@...hat.com,
echaudro@...hat.com, jasowang@...hat.com,
alexander.duyck@...il.com, saeed@...nel.org,
maciej.fijalkowski@...el.com, sameehj@...zon.com
Subject: [PATCH v7 bpf-next 05/14] net: mvneta: add multi buffer support to XDP_TX
Introduce the capability to map non-linear xdp buffer running
mvneta_xdp_submit_frame() for XDP_TX and XDP_REDIRECT
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/ethernet/marvell/mvneta.c | 91 ++++++++++++++++-----------
1 file changed, 55 insertions(+), 36 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 009b2c5a90b1..226d76e7ccc8 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1860,8 +1860,8 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
bytes_compl += buf->skb->len;
pkts_compl++;
dev_kfree_skb_any(buf->skb);
- } else if (buf->type == MVNETA_TYPE_XDP_TX ||
- buf->type == MVNETA_TYPE_XDP_NDO) {
+ } else if ((buf->type == MVNETA_TYPE_XDP_TX ||
+ buf->type == MVNETA_TYPE_XDP_NDO) && buf->xdpf) {
if (napi && buf->type == MVNETA_TYPE_XDP_TX)
xdp_return_frame_rx_napi(buf->xdpf);
else
@@ -2057,45 +2057,64 @@ mvneta_xdp_put_buff(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
static int
mvneta_xdp_submit_frame(struct mvneta_port *pp, struct mvneta_tx_queue *txq,
- struct xdp_frame *xdpf, bool dma_map)
+ struct xdp_frame *xdpf, int *nxmit_byte, bool dma_map)
{
- struct mvneta_tx_desc *tx_desc;
- struct mvneta_tx_buf *buf;
- dma_addr_t dma_addr;
+ struct xdp_shared_info *xdp_sinfo = xdp_get_shared_info_from_frame(xdpf);
+ int i, num_frames = xdpf->mb ? xdp_sinfo->nr_frags + 1 : 1;
+ struct mvneta_tx_desc *tx_desc = NULL;
+ struct page *page;
- if (txq->count >= txq->tx_stop_threshold)
+ if (txq->count + num_frames >= txq->size)
return MVNETA_XDP_DROPPED;
- tx_desc = mvneta_txq_next_desc_get(txq);
+ for (i = 0; i < num_frames; i++) {
+ struct mvneta_tx_buf *buf = &txq->buf[txq->txq_put_index];
+ skb_frag_t *frag = i ? &xdp_sinfo->frags[i - 1] : NULL;
+ int len = i ? xdp_get_frag_size(frag) : xdpf->len;
+ dma_addr_t dma_addr;
- buf = &txq->buf[txq->txq_put_index];
- if (dma_map) {
- /* ndo_xdp_xmit */
- dma_addr = dma_map_single(pp->dev->dev.parent, xdpf->data,
- xdpf->len, DMA_TO_DEVICE);
- if (dma_mapping_error(pp->dev->dev.parent, dma_addr)) {
- mvneta_txq_desc_put(txq);
- return MVNETA_XDP_DROPPED;
+ tx_desc = mvneta_txq_next_desc_get(txq);
+ if (dma_map) {
+ /* ndo_xdp_xmit */
+ void *data;
+
+ data = frag ? xdp_get_frag_address(frag) : xdpf->data;
+ dma_addr = dma_map_single(pp->dev->dev.parent, data,
+ len, DMA_TO_DEVICE);
+ if (dma_mapping_error(pp->dev->dev.parent, dma_addr)) {
+ for (; i >= 0; i--)
+ mvneta_txq_desc_put(txq);
+ return MVNETA_XDP_DROPPED;
+ }
+ buf->type = MVNETA_TYPE_XDP_NDO;
+ } else {
+ page = frag ? xdp_get_frag_page(frag)
+ : virt_to_page(xdpf->data);
+ dma_addr = page_pool_get_dma_addr(page);
+ if (frag)
+ dma_addr += xdp_get_frag_offset(frag);
+ else
+ dma_addr += sizeof(*xdpf) + xdpf->headroom;
+ dma_sync_single_for_device(pp->dev->dev.parent,
+ dma_addr, len,
+ DMA_BIDIRECTIONAL);
+ buf->type = MVNETA_TYPE_XDP_TX;
}
- buf->type = MVNETA_TYPE_XDP_NDO;
- } else {
- struct page *page = virt_to_page(xdpf->data);
+ buf->xdpf = i ? NULL : xdpf;
+
+ tx_desc->command = !i ? MVNETA_TXD_F_DESC : 0;
+ tx_desc->buf_phys_addr = dma_addr;
+ tx_desc->data_size = len;
+ *nxmit_byte += len;
- dma_addr = page_pool_get_dma_addr(page) +
- sizeof(*xdpf) + xdpf->headroom;
- dma_sync_single_for_device(pp->dev->dev.parent, dma_addr,
- xdpf->len, DMA_BIDIRECTIONAL);
- buf->type = MVNETA_TYPE_XDP_TX;
+ mvneta_txq_inc_put(txq);
}
- buf->xdpf = xdpf;
- tx_desc->command = MVNETA_TXD_FLZ_DESC;
- tx_desc->buf_phys_addr = dma_addr;
- tx_desc->data_size = xdpf->len;
+ /*last descriptor */
+ tx_desc->command |= MVNETA_TXD_L_DESC | MVNETA_TXD_Z_PAD;
- mvneta_txq_inc_put(txq);
- txq->pending++;
- txq->count++;
+ txq->pending += num_frames;
+ txq->count += num_frames;
return MVNETA_XDP_TX;
}
@@ -2106,8 +2125,8 @@ mvneta_xdp_xmit_back(struct mvneta_port *pp, struct xdp_buff *xdp)
struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
struct mvneta_tx_queue *txq;
struct netdev_queue *nq;
+ int cpu, nxmit_byte = 0;
struct xdp_frame *xdpf;
- int cpu;
u32 ret;
xdpf = xdp_convert_buff_to_frame(xdp);
@@ -2119,10 +2138,10 @@ mvneta_xdp_xmit_back(struct mvneta_port *pp, struct xdp_buff *xdp)
nq = netdev_get_tx_queue(pp->dev, txq->id);
__netif_tx_lock(nq, cpu);
- ret = mvneta_xdp_submit_frame(pp, txq, xdpf, false);
+ ret = mvneta_xdp_submit_frame(pp, txq, xdpf, &nxmit_byte, false);
if (ret == MVNETA_XDP_TX) {
u64_stats_update_begin(&stats->syncp);
- stats->es.ps.tx_bytes += xdpf->len;
+ stats->es.ps.tx_bytes += nxmit_byte;
stats->es.ps.tx_packets++;
stats->es.ps.xdp_tx++;
u64_stats_update_end(&stats->syncp);
@@ -2161,11 +2180,11 @@ mvneta_xdp_xmit(struct net_device *dev, int num_frame,
__netif_tx_lock(nq, cpu);
for (i = 0; i < num_frame; i++) {
- ret = mvneta_xdp_submit_frame(pp, txq, frames[i], true);
+ ret = mvneta_xdp_submit_frame(pp, txq, frames[i], &nxmit_byte,
+ true);
if (ret != MVNETA_XDP_TX)
break;
- nxmit_byte += frames[i]->len;
nxmit++;
}
--
2.30.2
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