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cxgb3: Check and handle the dma mapping errors

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This patch adds checks at approprate places whether *dma_map*() call has
succeeded or not.

Original Work by: Santosh Rastapur <santosh@chelsio.com>
Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arjun Vynipadath 2017-10-27 18:08:21 +05:30 committed by David S. Miller
parent 509708310c
commit c69fe40780
1 changed files with 92 additions and 26 deletions
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118
drivers/net/ethernet/chelsio/cxgb3/sge.c
View File

@ -455,6 +455,11 @@ static int alloc_pg_chunk(struct adapter *adapter, struct sge_fl *q,
q->pg_chunk.offset = 0;
mapping = pci_map_page(adapter->pdev, q->pg_chunk.page,
0, q->alloc_size, PCI_DMA_FROMDEVICE);
if (unlikely(pci_dma_mapping_error(adapter->pdev, mapping))) {
__free_pages(q->pg_chunk.page, order);
q->pg_chunk.page = NULL;
return -EIO;
}
q->pg_chunk.mapping = mapping;
}
sd->pg_chunk = q->pg_chunk;
@ -949,40 +954,78 @@ static inline unsigned int calc_tx_descs(const struct sk_buff *skb)
return flits_to_desc(flits);
}
/* map_skb - map a packet main body and its page fragments
* @pdev: the PCI device
* @skb: the packet
* @addr: placeholder to save the mapped addresses
*
* map the main body of an sk_buff and its page fragments, if any.
*/
static int map_skb(struct pci_dev *pdev, const struct sk_buff *skb,
dma_addr_t *addr)
{
const skb_frag_t *fp, *end;
const struct skb_shared_info *si;
if (skb_headlen(skb)) {
*addr = pci_map_single(pdev, skb->data, skb_headlen(skb),
PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, *addr))
goto out_err;
addr++;
}
si = skb_shinfo(skb);
end = &si->frags[si->nr_frags];
for (fp = si->frags; fp < end; fp++) {
*addr = skb_frag_dma_map(&pdev->dev, fp, 0, skb_frag_size(fp),
DMA_TO_DEVICE);
if (pci_dma_mapping_error(pdev, *addr))
goto unwind;
addr++;
}
return 0;
unwind:
while (fp-- > si->frags)
dma_unmap_page(&pdev->dev, *--addr, skb_frag_size(fp),
DMA_TO_DEVICE);
pci_unmap_single(pdev, addr[-1], skb_headlen(skb), PCI_DMA_TODEVICE);
out_err:
return -ENOMEM;
}
/**
* make_sgl - populate a scatter/gather list for a packet
* write_sgl - populate a scatter/gather list for a packet
* @skb: the packet
* @sgp: the SGL to populate
* @start: start address of skb main body data to include in the SGL
* @len: length of skb main body data to include in the SGL
* @pdev: the PCI device
* @addr: the list of the mapped addresses
*
* Generates a scatter/gather list for the buffers that make up a packet
* Copies the scatter/gather list for the buffers that make up a packet
* and returns the SGL size in 8-byte words. The caller must size the SGL
* appropriately.
*/
static inline unsigned int make_sgl(const struct sk_buff *skb,
struct sg_ent *sgp, unsigned char *start,
unsigned int len, struct pci_dev *pdev)
static inline unsigned int write_sgl(const struct sk_buff *skb,
struct sg_ent *sgp, unsigned char *start,
unsigned int len, const dma_addr_t *addr)
{
dma_addr_t mapping;
unsigned int i, j = 0, nfrags;
unsigned int i, j = 0, k = 0, nfrags;
if (len) {
mapping = pci_map_single(pdev, start, len, PCI_DMA_TODEVICE);
sgp->len[0] = cpu_to_be32(len);
sgp->addr[0] = cpu_to_be64(mapping);
j = 1;
sgp->addr[j++] = cpu_to_be64(addr[k++]);
}
nfrags = skb_shinfo(skb)->nr_frags;
for (i = 0; i < nfrags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
mapping = skb_frag_dma_map(&pdev->dev, frag, 0, skb_frag_size(frag),
DMA_TO_DEVICE);
sgp->len[j] = cpu_to_be32(skb_frag_size(frag));
sgp->addr[j] = cpu_to_be64(mapping);
sgp->addr[j] = cpu_to_be64(addr[k++]);
j ^= 1;
if (j == 0)
++sgp;
@ -1138,7 +1181,7 @@ static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb,
const struct port_info *pi,
unsigned int pidx, unsigned int gen,
struct sge_txq *q, unsigned int ndesc,
unsigned int compl)
unsigned int compl, const dma_addr_t *addr)
{
unsigned int flits, sgl_flits, cntrl, tso_info;
struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1];
@ -1196,7 +1239,7 @@ static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb,
}
sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl;
sgl_flits = make_sgl(skb, sgp, skb->data, skb_headlen(skb), adap->pdev);
sgl_flits = write_sgl(skb, sgp, skb->data, skb_headlen(skb), addr);
write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, gen,
htonl(V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) | compl),
@ -1227,6 +1270,7 @@ netdev_tx_t t3_eth_xmit(struct sk_buff *skb, struct net_device *dev)
struct netdev_queue *txq;
struct sge_qset *qs;
struct sge_txq *q;
dma_addr_t addr[MAX_SKB_FRAGS + 1];
/*
* The chip min packet length is 9 octets but play safe and reject
@ -1255,6 +1299,14 @@ netdev_tx_t t3_eth_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_BUSY;
}
/* Check if ethernet packet can't be sent as immediate data */
if (skb->len > (WR_LEN - sizeof(struct cpl_tx_pkt))) {
if (unlikely(map_skb(adap->pdev, skb, addr) < 0)) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
}
q->in_use += ndesc;
if (unlikely(credits - ndesc < q->stop_thres)) {
t3_stop_tx_queue(txq, qs, q);
@ -1312,7 +1364,7 @@ netdev_tx_t t3_eth_xmit(struct sk_buff *skb, struct net_device *dev)
if (likely(!skb_shared(skb)))
skb_orphan(skb);
write_tx_pkt_wr(adap, skb, pi, pidx, gen, q, ndesc, compl);
write_tx_pkt_wr(adap, skb, pi, pidx, gen, q, ndesc, compl, addr);
check_ring_tx_db(adap, q);
return NETDEV_TX_OK;
}
@ -1577,7 +1629,8 @@ static void setup_deferred_unmapping(struct sk_buff *skb, struct pci_dev *pdev,
*/
static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb,
struct sge_txq *q, unsigned int pidx,
unsigned int gen, unsigned int ndesc)
unsigned int gen, unsigned int ndesc,
const dma_addr_t *addr)
{
unsigned int sgl_flits, flits;
struct work_request_hdr *from;
@ -1598,10 +1651,9 @@ static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb,
flits = skb_transport_offset(skb) / 8;
sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl;
sgl_flits = make_sgl(skb, sgp, skb_transport_header(skb),
skb_tail_pointer(skb) -
skb_transport_header(skb),
adap->pdev);
sgl_flits = write_sgl(skb, sgp, skb_transport_header(skb),
skb_tail_pointer(skb) - skb_transport_header(skb),
addr);
if (need_skb_unmap()) {
setup_deferred_unmapping(skb, adap->pdev, sgp, sgl_flits);
skb->destructor = deferred_unmap_destructor;
@ -1659,6 +1711,12 @@ again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK);
goto again;
}
if (!immediate(skb) &&
map_skb(adap->pdev, skb, (dma_addr_t *)skb->head)) {
spin_unlock(&q->lock);
return NET_XMIT_SUCCESS;
}
gen = q->gen;
q->in_use += ndesc;
pidx = q->pidx;
@ -1669,7 +1727,7 @@ again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK);
}
spin_unlock(&q->lock);
write_ofld_wr(adap, skb, q, pidx, gen, ndesc);
write_ofld_wr(adap, skb, q, pidx, gen, ndesc, (dma_addr_t *)skb->head);
check_ring_tx_db(adap, q);
return NET_XMIT_SUCCESS;
}
@ -1687,6 +1745,7 @@ static void restart_offloadq(unsigned long data)
struct sge_txq *q = &qs->txq[TXQ_OFLD];
const struct port_info *pi = netdev_priv(qs->netdev);
struct adapter *adap = pi->adapter;
unsigned int written = 0;
spin_lock(&q->lock);
again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK);
@ -1706,10 +1765,15 @@ again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK);
break;
}
if (!immediate(skb) &&
map_skb(adap->pdev, skb, (dma_addr_t *)skb->head))
break;
gen = q->gen;
q->in_use += ndesc;
pidx = q->pidx;
q->pidx += ndesc;
written += ndesc;
if (q->pidx >= q->size) {
q->pidx -= q->size;
q->gen ^= 1;
@ -1717,7 +1781,8 @@ again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK);
__skb_unlink(skb, &q->sendq);
spin_unlock(&q->lock);
write_ofld_wr(adap, skb, q, pidx, gen, ndesc);
write_ofld_wr(adap, skb, q, pidx, gen, ndesc,
(dma_addr_t *)skb->head);
spin_lock(&q->lock);
}
spin_unlock(&q->lock);
@ -1727,8 +1792,9 @@ again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK);
set_bit(TXQ_LAST_PKT_DB, &q->flags);
#endif
wmb();
t3_write_reg(adap, A_SG_KDOORBELL,
F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id));
if (likely(written))
t3_write_reg(adap, A_SG_KDOORBELL,
F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id));
}
/**