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nfp: propagate list buffer size in struct rx_ring 

Free list buffer size needs to be propagated to few functions
as a parameter and added to struct nfp_net_rx_ring since soon
some of the functions will be reused to manage rings with
buffers of size different than nn->fl_bufsz.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2016-04-07 19:39:45 +01:00 committed by David S. Miller
parent aba52df80b
commit 30d2117191
2 changed files with 19 additions and 8 deletions
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3
drivers/net/ethernet/netronome/nfp/nfp_net.h
View File

@ -298,6 +298,8 @@ struct nfp_net_rx_buf {
* @rxds: Virtual address of FL/RX ring in host memory
* @dma: DMA address of the FL/RX ring
* @size: Size, in bytes, of the FL/RX ring (needed to free)
* @bufsz: Buffer allocation size for convenience of management routines
* (NOTE: this is in second cache line, do not use on fast path!)
*/
struct nfp_net_rx_ring {
struct nfp_net_r_vector *r_vec;
@ -319,6 +321,7 @@ struct nfp_net_rx_ring {
dma_addr_t dma;
unsigned int size;
unsigned int bufsz;
} ____cacheline_aligned;
/**

24
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -957,25 +957,27 @@ static inline int nfp_net_rx_space(struct nfp_net_rx_ring *rx_ring)
* nfp_net_rx_alloc_one() - Allocate and map skb for RX
* @rx_ring: RX ring structure of the skb
* @dma_addr: Pointer to storage for DMA address (output param)
* @fl_bufsz: size of freelist buffers
*
* This function will allcate a new skb, map it for DMA.
*
* Return: allocated skb or NULL on failure.
*/
static struct sk_buff *
nfp_net_rx_alloc_one(struct nfp_net_rx_ring *rx_ring, dma_addr_t *dma_addr)
nfp_net_rx_alloc_one(struct nfp_net_rx_ring *rx_ring, dma_addr_t *dma_addr,
unsigned int fl_bufsz)
{
struct nfp_net *nn = rx_ring->r_vec->nfp_net;
struct sk_buff *skb;
skb = netdev_alloc_skb(nn->netdev, nn->fl_bufsz);
skb = netdev_alloc_skb(nn->netdev, fl_bufsz);
if (!skb) {
nn_warn_ratelimit(nn, "Failed to alloc receive SKB\n");
return NULL;
}
*dma_addr = dma_map_single(&nn->pdev->dev, skb->data,
nn->fl_bufsz, DMA_FROM_DEVICE);
fl_bufsz, DMA_FROM_DEVICE);
if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) {
dev_kfree_skb_any(skb);
nn_warn_ratelimit(nn, "Failed to map DMA RX buffer\n");
@ -1068,7 +1070,7 @@ nfp_net_rx_ring_bufs_free(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
continue;
dma_unmap_single(&pdev->dev, rx_ring->rxbufs[i].dma_addr,
nn->fl_bufsz, DMA_FROM_DEVICE);
rx_ring->bufsz, DMA_FROM_DEVICE);
dev_kfree_skb_any(rx_ring->rxbufs[i].skb);
rx_ring->rxbufs[i].dma_addr = 0;
rx_ring->rxbufs[i].skb = NULL;
@ -1090,7 +1092,8 @@ nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring)
for (i = 0; i < rx_ring->cnt - 1; i++) {
rxbufs[i].skb =
nfp_net_rx_alloc_one(rx_ring, &rxbufs[i].dma_addr);
nfp_net_rx_alloc_one(rx_ring, &rxbufs[i].dma_addr,
rx_ring->bufsz);
if (!rxbufs[i].skb) {
nfp_net_rx_ring_bufs_free(nn, rx_ring);
return -ENOMEM;
@ -1278,7 +1281,8 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
skb = rx_ring->rxbufs[idx].skb;
new_skb = nfp_net_rx_alloc_one(rx_ring, &new_dma_addr);
new_skb = nfp_net_rx_alloc_one(rx_ring, &new_dma_addr,
nn->fl_bufsz);
if (!new_skb) {
nfp_net_rx_give_one(rx_ring, rx_ring->rxbufs[idx].skb,
rx_ring->rxbufs[idx].dma_addr);
@ -1465,10 +1469,12 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
/**
* nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
* @rx_ring: RX ring to allocate
* @fl_bufsz: Size of buffers to allocate
*
* Return: 0 on success, negative errno otherwise.
*/
static int nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring)
static int
nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net *nn = r_vec->nfp_net;
@ -1476,6 +1482,7 @@ static int nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring)
int sz;
rx_ring->cnt = nn->rxd_cnt;
rx_ring->bufsz = fl_bufsz;
rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;
rx_ring->rxds = dma_zalloc_coherent(&pdev->dev, rx_ring->size,
@ -1817,7 +1824,8 @@ static int nfp_net_netdev_open(struct net_device *netdev)
if (err)
goto err_cleanup_vec_p;
err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring);
err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring,
nn->fl_bufsz);
if (err)
goto err_free_tx_ring_p;