diff options
| -rw-r--r-- | drivers/s390/net/qeth_core.h | 4 | ||||
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 86 | ||||
| -rw-r--r-- | drivers/s390/net/qeth_l2_main.c | 29 | ||||
| -rw-r--r-- | drivers/s390/net/qeth_l3_main.c | 31 |
4 files changed, 80 insertions, 70 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index 6d8005af67f5..2a5ec99643df 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -1047,7 +1047,9 @@ netdev_features_t qeth_features_check(struct sk_buff *skb, struct net_device *dev, netdev_features_t features); int qeth_vm_request_mac(struct qeth_card *card); -int qeth_push_hdr(struct sk_buff *skb, struct qeth_hdr **hdr, unsigned int len); +int qeth_add_hw_header(struct qeth_card *card, struct sk_buff *skb, + struct qeth_hdr **hdr, unsigned int len, + unsigned int *elements); /* exports for OSN */ int qeth_osn_assist(struct net_device *, void *, int); diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 84f1e1e33f3f..e7b34624df1e 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -3831,6 +3831,17 @@ int qeth_get_elements_for_frags(struct sk_buff *skb) } EXPORT_SYMBOL_GPL(qeth_get_elements_for_frags); +static unsigned int qeth_count_elements(struct sk_buff *skb, int data_offset) +{ + unsigned int elements = qeth_get_elements_for_frags(skb); + addr_t end = (addr_t)skb->data + skb_headlen(skb); + addr_t start = (addr_t)skb->data + data_offset; + + if (start != end) + elements += qeth_get_elements_for_range(start, end); + return elements; +} + /** * qeth_get_elements_no() - find number of SBALEs for skb data, inc. frags. * @card: qeth card structure, to check max. elems. @@ -3846,12 +3857,7 @@ EXPORT_SYMBOL_GPL(qeth_get_elements_for_frags); int qeth_get_elements_no(struct qeth_card *card, struct sk_buff *skb, int extra_elems, int data_offset) { - addr_t end = (addr_t)skb->data + skb_headlen(skb); - int elements = qeth_get_elements_for_frags(skb); - addr_t start = (addr_t)skb->data + data_offset; - - if (start != end) - elements += qeth_get_elements_for_range(start, end); + int elements = qeth_count_elements(skb, data_offset); if ((elements + extra_elems) > QETH_MAX_BUFFER_ELEMENTS(card)) { QETH_DBF_MESSAGE(2, "Invalid size of IP packet " @@ -3885,22 +3891,72 @@ int qeth_hdr_chk_and_bounce(struct sk_buff *skb, struct qeth_hdr **hdr, int len) EXPORT_SYMBOL_GPL(qeth_hdr_chk_and_bounce); /** - * qeth_push_hdr() - push a qeth_hdr onto an skb. - * @skb: skb that the qeth_hdr should be pushed onto. + * qeth_add_hw_header() - add a HW header to an skb. + * @skb: skb that the HW header should be added to. * @hdr: double pointer to a qeth_hdr. When returning with >= 0, * it contains a valid pointer to a qeth_hdr. - * @len: length of the hdr that needs to be pushed on. + * @len: length of the HW header. * * Returns the pushed length. If the header can't be pushed on * (eg. because it would cross a page boundary), it is allocated from * the cache instead and 0 is returned. + * The number of needed buffer elements is returned in @elements. * Error to create the hdr is indicated by returning with < 0. */ -int qeth_push_hdr(struct sk_buff *skb, struct qeth_hdr **hdr, unsigned int len) -{ - if (skb_headroom(skb) >= len && - qeth_get_elements_for_range((addr_t)skb->data - len, - (addr_t)skb->data) == 1) { +int qeth_add_hw_header(struct qeth_card *card, struct sk_buff *skb, + struct qeth_hdr **hdr, unsigned int len, + unsigned int *elements) +{ + const unsigned int max_elements = QETH_MAX_BUFFER_ELEMENTS(card); + unsigned int __elements; + addr_t start, end; + bool push_ok; + int rc; + +check_layout: + start = (addr_t)skb->data - len; + end = (addr_t)skb->data; + + if (qeth_get_elements_for_range(start, end + 1) == 1) { + /* Push HW header into same page as first protocol header. */ + push_ok = true; + __elements = qeth_count_elements(skb, 0); + } else { + __elements = 1 + qeth_count_elements(skb, 0); + if (qeth_get_elements_for_range(start, end) == 1) + /* Push HW header into a new page. */ + push_ok = true; + else + /* Use header cache. */ + push_ok = false; + } + + /* Compress skb to fit into one IO buffer: */ + if (__elements > max_elements) { + if (!skb_is_nonlinear(skb)) { + /* Drop it, no easy way of shrinking it further. */ + QETH_DBF_MESSAGE(2, "Dropped an oversized skb (Max Elements=%u / Actual=%u / Length=%u).\n", + max_elements, __elements, skb->len); + return -E2BIG; + } + + rc = skb_linearize(skb); + if (card->options.performance_stats) { + if (rc) + card->perf_stats.tx_linfail++; + else + card->perf_stats.tx_lin++; + } + if (rc) + return rc; + + /* Linearization changed the layout, re-evaluate: */ + goto check_layout; + } + + *elements = __elements; + /* Add the header: */ + if (push_ok) { *hdr = skb_push(skb, len); return len; } @@ -3910,7 +3966,7 @@ int qeth_push_hdr(struct sk_buff *skb, struct qeth_hdr **hdr, unsigned int len) return -ENOMEM; return 0; } -EXPORT_SYMBOL_GPL(qeth_push_hdr); +EXPORT_SYMBOL_GPL(qeth_add_hw_header); static void __qeth_fill_buffer(struct sk_buff *skb, struct qeth_qdio_out_buffer *buf, diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index a785c5ff73cd..905f3bb3a87c 100644 --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -672,39 +672,21 @@ static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb, int ipv) { int push_len = sizeof(struct qeth_hdr); - unsigned int hdr_elements = 0; struct qeth_hdr *hdr = NULL; unsigned int hd_len = 0; unsigned int elements; bool is_sg; int rc; - /* fix hardware limitation: as long as we do not have sbal - * chaining we can not send long frag lists - */ - if (!qeth_get_elements_no(card, skb, 0, 0)) { - rc = skb_linearize(skb); - - if (card->options.performance_stats) { - if (rc) - card->perf_stats.tx_linfail++; - else - card->perf_stats.tx_lin++; - } - if (rc) - return rc; - } - rc = skb_cow_head(skb, push_len); if (rc) return rc; - push_len = qeth_push_hdr(skb, &hdr, push_len); + push_len = qeth_add_hw_header(card, skb, &hdr, push_len, &elements); if (push_len < 0) return push_len; if (!push_len) { /* hdr was allocated from cache */ hd_len = sizeof(*hdr); - hdr_elements = 1; } qeth_l2_fill_header(hdr, skb, cast_type, skb->len - push_len); if (skb->ip_summed == CHECKSUM_PARTIAL) { @@ -713,18 +695,11 @@ static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb, card->perf_stats.tx_csum++; } - elements = qeth_get_elements_no(card, skb, hdr_elements, 0); - if (!elements) { - rc = -E2BIG; - goto out; - } - elements += hdr_elements; - is_sg = skb_is_nonlinear(skb); /* TODO: remove the skb_orphan() once TX completion is fast enough */ skb_orphan(skb); rc = qeth_do_send_packet(card, queue, skb, hdr, 0, hd_len, elements); -out: + if (!rc) { if (card->options.performance_stats) { card->perf_stats.buf_elements_sent += elements; diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index c12aeb7d8f26..f7bcc4853c45 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -2166,28 +2166,13 @@ static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb, int cast_type) { const unsigned int hw_hdr_len = sizeof(struct qeth_hdr); + unsigned int frame_len, elements; unsigned char eth_hdr[ETH_HLEN]; - unsigned int hdr_elements = 0; struct qeth_hdr *hdr = NULL; - int elements, push_len, rc; unsigned int hd_len = 0; - unsigned int frame_len; + int push_len, rc; bool is_sg; - /* compress skb to fit into one IO buffer: */ - if (!qeth_get_elements_no(card, skb, 0, 0)) { - rc = skb_linearize(skb); - - if (card->options.performance_stats) { - if (rc) - card->perf_stats.tx_linfail++; - else - card->perf_stats.tx_lin++; - } - if (rc) - return rc; - } - /* re-use the L2 header area for the HW header: */ rc = skb_cow_head(skb, hw_hdr_len - ETH_HLEN); if (rc) @@ -2196,22 +2181,14 @@ static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb, skb_pull(skb, ETH_HLEN); frame_len = skb->len; - push_len = qeth_push_hdr(skb, &hdr, hw_hdr_len); + push_len = qeth_add_hw_header(card, skb, &hdr, hw_hdr_len, &elements); if (push_len < 0) return push_len; if (!push_len) { /* hdr was added discontiguous from skb->data */ hd_len = hw_hdr_len; - hdr_elements = 1; } - elements = qeth_get_elements_no(card, skb, hdr_elements, 0); - if (!elements) { - rc = -E2BIG; - goto out; - } - elements += hdr_elements; - if (skb->protocol == htons(ETH_P_AF_IUCV)) qeth_l3_fill_af_iucv_hdr(hdr, skb, frame_len); else @@ -2226,7 +2203,7 @@ static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb, rc = qeth_do_send_packet(card, queue, skb, hdr, 0, hd_len, elements); } -out: + if (!rc) { if (card->options.performance_stats) { card->perf_stats.buf_elements_sent += elements; |